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CPA2008-00007
ePA.2000Ooo7 \AIImDMWAJ • P-6 City of Tigard, Oregon • 13125 Sid Hall Blvd. o Tig•OR 97223 October 2, 2009 `' h • F. W. Fields • 1149 SW Davenport Ave. Portland, OR 97201 • Re: Permit No. CPA2008-00007, SLR2008-00003, SLR2008-00004 Dear Mr. Fields: The City of Tigard has canceled the above referenced permit(s) and enclose a refund for the following: Site Address: N/A Project Name: Fields Comp Plan/Wall Street Job No.: Refund: ® Check #100986 in the amount of$11,476.00. n Credit card "return" receipt in the amount of$ ❑ Trust account"deposit" receipt in the amount of$ Notes: Application withdrawn, applicant to re-apply. Refund 100%of application fees. If you have any questions please contact me at 503.718.2430. Sincerely, Dianna Howse Building Division Services Supervisor Enc. • • I:\Building\Refunds\Administration\LtrRefund-CancelPermit.doc 01/16/07 Phone: 503.639.4171 o Fax: 503.684.7297 . 0 www.tigard-or.gov o TTY Relay: 503.684.2772 • • City of Tigard TIGARD Accela Refund Request This form is used for refund requests of land use, engineering and building application fees. Receipts, documentation and the Request for Permit Action or Refund form (if applicable) must be attached to this form. Refund requests are due to Accela System Administrator by Friday at 5:00 PM for processing each Monday. Accounts Payable will route refund checks to Accela System Administrator for distribution. Please allow 1-2 weeks for processing. PAYABLE TO: F. W. Fields DATE: 9/30/09 1149 SW Davenport Ave. Portland, OR 97201 REQUESTED BY: Dianna Howse CAC TRANSACTION INFORMATION: ✓ Receipt#: 2008-2438, 2008-2443 Case #: CPA2008-00007,SLR2008- 0003, SLR2008-00004 Date: 7/10/08 Address/Parcel: 2S10100-01200 Pay Method: Check Project Name: Fields Comp Plan/Wall Street EXPLANATION: Application withdrawn;applicant to re-apply. Refund 100%of application fees. L :,":r%. - r.,f`„ :A.: is:: - .:}� _ -�i-'..a:'°,-..f•{.t R3:s;ar'="i"'r'=E;.'�'g.' }s t .t:� 'k;;';�i:=1 .s.a. =1' iz:- - _ :.'4r T�f'+.:ri7.:di�` s � > v-a.<, •,al REFUND„INFORIVIAT30N. �t „a i. `%,e:`'. _ ;q,'4.:�;•=�ti:��,,.:..-.',:. .�t'.":P�'-r.= � _ •�:�"=='.:'£w.. �r..`kA,x..3, _. _ ;fz`.%' .... ::Y;S..SX=.. "-.rt- :•Y ..s: =_.'ti5._.J„_. "r'% ''1i�- '^k.�{�:.. ..r�ii:e a.�,v _.xtzL�fi..�3;ii;78 a.•t.• p S'Y?r-� � ,?'§0':y'i•jT�:. S°.L`.lG.,,.h, .'?- `a'V t $rFeeY'Desco< tiori�Erom=Recei”t�s' _ -���.4Revenue;'Account No.•. .�'�:'=u-,�•• Refund.,. j� 0xaii •le:: 'IJ.ILLS..Perriii[_'°Fee,`' , 0.�'�A4F:.rExatrl l45'' A_ m0000=`432000:K:` µ- ;_ ou . c nt p [LANDUS] Comprehensive Plan 100-0000-438000 $7,742.00 [LRPF]LR Planning Surcharge 100-0000-438050 1,144.00 [LANDUS] 50%Joint App Fee 100-0000-438000 1,128.00 \ [LRPF]LR Planning Surcharge 100-0000-438050 167.00 [LANDUS] 50%Joint App Fee 100-0000-438000 1,128.00 [LRPF]LR Planning Surcharge 100-0000-438050 167.00 TOTAL REFUND: $11,476.00 APPROVALS: If under$500 Professional Staff If under$7,500 Division Manager If under$22,500 Department Manager ✓ 1111 If under$50,000 City Manager If over$50,000 Local Contract Review Board -'t��t(�����!.�.:'.t^, _T�4” :'��•'Nt.+�SD ti,^ "- 'w(.•y'"-'_ ��i.a�,. _ _,S.Zi. _ %Try._ -- __ ;j Y �4- .F,„, ..,�..Y���� ,�_L�S��fi' q yA�?�•:il:'r i YF"�' ' ..2.,c4 'F �,'FORMA a EI:A : TE' _ . ,• ,.,..,;:. t•�:�'� 2 .,.��t...,,5a�3..>.��,����p-tia .r ,_ ,. CC ._-_ -..:$ 5�..._ M=�t1�DMi�Ni'STRAT_I,QN:USE, _ �n� ���,�9' �a..�N Refund Request Reviewed: Date: S Q ��; 9 By: � - Case Refund Processed: Date: � 0 A B I:\Building\Refunds\RefundRequest.doc 04/13/09 • • • Community Development Request for Permit Action TIGARD TO: CITY OF TIGARD Building Division Services Coordinator 13125 SW Hall Blvd.,Tigard,OR 97223 Phone: 503.718.2430 Fax: 503.598.1960 www.tigard-or.gov FROM: ❑ Owner • ® Applicant ❑ Contractor ® City Staff (check one REFUND OR Name: F. W. Fields INVOICE TO: (Business or Individual) Mailing Address: 1149 SW Davenport Ave. City/State/Zip: Portland, OR 97201 Phone No.: PLEASE TAKE ACTION FOR THE ITEM(S) CHECKED (✓): ❑ CANCEL PERMIT APPLICATION. • REFUND PERMIT FEES (attach receipt,if available). ❑ INVOICE FOR FEES DUE (attach case fee schedule and explain below). ❑ REMOVE CONTRACTOR FROM PERMIT (do not cancel permit). $8386 11,-295 . Permit #: CPA2008-00007, SLR2008-00003, & SLR2008-00004 Site Address or Parcel#: SW No Address, 2S10100-01200 Project Name: Fields Comp Plan Amendment for Wall Street Subdivision Name: Lot #: EXPLANATION: Application was withdrawn in February 2009. The applicant was going to re-apply and requested the funds either be transferred or refunded. We were going to transfer. Now that is not an option. The applicant is re-applying. Please refund 100%. Signature: Q . Date: 9/28/09 Cheryl Caines 5; �I, 47�e Print Name: TcD-{—a Refund Policy 1. The Director or Building Official may authorize the refund of: a) any fee which was erroneously paid or collected. b) not more than 80%of the land use application fee when an application is withdrawn or canceled before any review effort has been expended. c) not more than 80%of the land use application fee for issued permits. d) not more than 800/0 of the building plan review fee when an application is canceled before any plan review effort has been expended. e) not more than 80%of the building permit fee for issued permits prior to any inspection requests. 2. Refunds will be returned to the original Payer in the same method in which payment was received. Please allow 1-2 weeks for processing refunds. FOR OFFICE USE ONLY Rte to Sys Admin: Date By Rte to -Admin: Date /Vary 9 By i Refund Processed: Date By Invoice Processed: Date By Permit Canceled: Date By Parcel Tag Added: Date By Receipt# Date Method Amount$ I:\Building\Forms\RegPermitAction.doc Rev 07/26/07 • MN: - PORTLAND, •OREGON . 3400 U.S.Bancorp Tower SEATTLE,WASHINGTON 111 S.W.Fifth Avenue Portland,Oregon 97204-3699 a MILLED. NASI�LLP CENTRAL R,WASHINGTON 4 . �t .,,;�, CENTRAL OREGON OFFICE 503.224.5858 v`t"s ATTORNEYS AT LAW WWW.MILLERNASH.COM FAX 503.224.0155 William L.Rasmussen william.rasmussen @millernash.com (503)205-2308 direct line • • February 6, 2009 Ms. Cheryl Caines Associate Planner City of Tigard `# Department of Community Development Current Planning Division 13125 S.W. Hall Boulevard '' - Tigard, Oregon 97223 Subject: Sensitive Lands Review/Comprehensive Plan Amendment/Tree Removal Applications (CPA 2008-00007, SLR 2008-00003, SLR 2008-00004) Dear Ms. Caines: • xrm� As you know, this office represents Mr. Fred Fields in his above- �. ,. mentioned applications. By this letter, we are withdrawing the above mentioned applications. We will resubmit these applications shortly. We ask that the fees from these applications either be returned to Mr. Fields or be applied to the resubmitted applications. Please feel free to call or e-mail me with any questions or concerns that you may have regarding this matter. Sincerely, r=4 William L. Rasmussen M1 PDXDOCS:1819419.1 196080-2001 • : .. q . II . Community Development Request for Permit Action TIGARD TO: CITY OF TIGARD Building Division Services Coordinator 13125 SW Hall Blvd.,Tigard, OR 97223 Phone: 503.718.2430 Fax 503.598.1960 www.tigard-or.gov FROM: n Owner El Applicant El Contractor ® City Staff (check one) REFUND OR Name: F. W. Fields INVOICE TO: (Business or Individual) • Mailing Address: 1149 SW Davenport Ave. City/State/Zip: Portland, OR 97201 Phone No.: PLEASE TAKE ACTION FOR THE ITEM(S) CHECKED (✓): (1 CANCEL PERMIT APPLICATION. ® REFUND PERMIT FEES (attach receipt,if available). ❑ INVOICE FOR FEES DUE (attach case fee schedule and explain below). ❑ REMOVE CONTRACTOR FROM PERMIT (do not cancel permit). $0,S8Co, 11,-295 $I,0195- .Permit#: CPA2008-00007, SLR2008-00003,& SLR2008-00004 Site Address or Parcel #: SW No Address, 2S10100-01200 Project Name: Fields Comp Plan Amendment for Wall Street Subdivision Name: Lot#: EXPLANATION: Application was withdrawn in February 2009. The applicant was going to re-apply and requested the funds either be transferred or refunded. We were going to transfer. Now that is not an option. The applicant is re-applying. Please refund 100%. Signature: a . .C¢&fi,.- Date: 9/28/09 Cheryl Caines Print Name: —FD- 1 -r-t4-.6.- $1I/ 47(P• °° Refund Policy 1. The Director or Building Official may authorize the refund of: a) any fee which was erroneously paid or collected. b) not more than 80%of the land use application fee when an application is withdrawn or canceled before any review effort has been expended. c) not more than 80%of the land use application fee for issued permits. d) not more than 80%of the building plan review fee when an application is canceled before any plan review effort has been expended. e) not more than 80%of the building permit fee for issued permits prior to any inspection requests. 2. Refunds will be returned to the original Payer in the same method in which payment was received. Please allow 1-2 weeks for processing refunds. FOR OFFICE USE ONLY Rte to Sys Admin: Date By Rte to Bldg Admin: Date By Refund Processed: Date By Invoice Processed: Date By Permit Canceled: Date By Parcel Tag Added: Date _By Receipt# Date Method .Amount$ I:\Building\Forms\RegPermitAction.doc Rev 07/26/07 • 410 PORTLAND,OREGON 3400 U.S.Bancorp Tower SEATTLE,WASHINGTON 111 S.W.Fifth Avenue M LLP MILLER NASH VANCOUVER,WASHINGTON Portland,Oregon 97204-3699 CENTRAL OREGON OFFICE 503.224.5858 ATTORNEYS AT LAW WWW.MILLERNASH.COM FAX 503.224.0155 William L.Rasmussen William.rasmussen @millernash.com . (503)205-2308 direct line February 6, 2009 Ms. Cheryl Caines Associate Planner • City of Tigard Department of Community Development Current Planning Division 13125 S.W. Hall Boulevard Tigard, Oregon 97223 Subject: Sensitive Lands Review/Comprehensive Plan Amendment/Tree Removal Applications (CPA 2008-00007, SLR 2008-00003, SLR 2008-00004) Dear Ms. Caines: As you know, this office represents Mr. Fred Fields in his above- mentioned applications. By this letter, we are withdrawing the above mentioned applications. We will resubmit these applications shortly. We ask that the fees from these applications either be returned to Mr. Fields or be applied to the resubmitted applications. Please feel free to call or e-mail me with any questions or concerns that you may have regarding this matter. Sincerely, .i\/ •William L. Rasmussen . PDXDOCS:1819419.1 196080-2001 J Cheryl Caines From: Rasmussen, William [william.rsmussen @millernash.com] Sent: Friday, February 06, 2009 4:19 PM To: Cheryl Caines Subject: Withdrawal letter Attachments: letter.pdf Cheryl, We got the go ahead from Fred to withdraw the access related applications. Our official withdrawal letter is attached. We will want to talk next week about what we need to do to get this teed up again. Thanks for your help on this. Will William L. Rasmussen Miller Nash LLP 3400 U.S. Bancorp Tower 1 111 S.W. Fifth Avenue 1 Portland, Oregon 97204-3699 Direct: 503-205-2308 1 Office: 503-224-5858 1 Fax: 503-224-0155 william.rasmussen(0millernash.com 1 www.millernash.com Confidentiality Notice: This e-mail message may contain confidential or privileged information. If you have received this message by mistake, please do not review, disclose, copy, or distribute the e-mail. Instead, please notify us immediately by replying to this message or telephoning us. Thank you. Tax Advice Notice: IRS Circular 230 requires us to advise you that, if this communication or any attachment contains any tax advice, the advice is not intended to be used, and cannot be used, for the purpose of avoiding federal tax penalties. A taxpayer may rely on professional advice to avoid federal tax penalties only if the advice is reflected in a comprehensive tax opinion that conforms to stringent requirements. Please contact us if you have any questions about Circular 230 or would like to discuss our preparation of an opinion that conforms to these IRS rules. Original Message From: WRASMUSSEN [mailto:/0=MillerNash/OU=Portland/cn=Recipients/cn=wrammussen] Sent: Friday, February 06, 2009 3:45 PM To: Rasmussen, William Subject: letter Please open the attached document. This document was sent to you using an HP Digital Sender. 1 r - Cheryl Caines From: Cheryl Caines Sent: Friday, February 06, 2009 9:55 AM To: 'Rasmussen, William' Subject: Fields Application Will, I received the supplemental materials for Mr. Fields CPA/SLR (Wall Street Extension). I counted 180 days from the original submittal date (July 10, 2008)and came up with 1/6/09 as the 180th day. I then read through ORS 227.178 to check-is the 180 days from submittal or from the date of the incomplete notice? ORS states that the 180 days is from when the application is first submitted. Can you explain how you are calculating the date? Thanks, Cheryl Gaines Associate Planner City of Tigard (503) 718-2437 1 City of Tigard, Oregon • 13125 SW Hall Blvd. • Tigard, OR 97223 • uI August 8, 2008 vg tGARt . Rhys Konrad Group Mackenzie 1515 SE Water Ave., Suite 200 Portland, OR 97214 Dear Mr. Konrad: RE: Notice of Incomplete Application Submittal— CPA2008-00007, SLR2008-00003 & SLR2008-00004 The City has not received the information necessary to begin the review of your Comprehensive Plan Amendment/Sensitive Land Review applications. The subject site is located at west of Hall Boulevard near the intersection with Wall Street (WCTM 2S10100 Tax Lot 1200). This letter is to inform you of Staff's concerns regarding the application and materials necessary to deem the application complete. 1. Based on Comprehensive Plan Policy 2.1.15 the transportation and public facilities shall be available or committed to be made available, or of sufficient capacity to serve the land uses allowed by the proposed map designation. Therefore, the zone change application must follow the access application. 2. Comprehensive Plan Policies: • Environmental Quality Goal 6.2—Policies: 3, 4, 5, and 7 • Hazards Goal 7.1 —Policies 8, 9, 10, and 11 3. The following items are out-of-date or not specific to the project: • Clean Water Services SPL • ESEE analysis • Alternatives Analysis 4. Plans. Please provide plans that clearly show the proposed alignment and design of Wall Street, the specific affected portions of sensitive lands and work proposed within these areas, affected parcels, and any mitigation that is proposed. Plans must be 24" x 36". 5. Sensitive Lands Review. Please re-address this code section with facts, findings and conslusions to support how the code requirements are met. Please do not refer the reader to the attachments to find the informtion. What are the measures taken to ensure control of erosion and eliminate stream sedimentation? Please describe the work proposed within the sensitive lands. In regards to wetlands, please distinguish between impacts to highly rated wetlands from those that are either man-made or are not designated as significant. • Phone: 503.639.4171 • Fax: 503.684.7297 • www.tigard-or.gov • TTY Relay: 503.684.2772 6. Tree Removal. The narrative states that trees must be removed for the construction of Wall Street, but tree removal permit applications were not submitted with this application. Trees within sensitive lands, including Significant Habitiat Area, require a permit for removal. 7. Streets and Utility Standards. Please re-address Chapter 18.810, sections 030, 040, and 070 with information regarding the proposed design of Wall Street. If you have any questions about the above comments, please contact me at (503) 718-2437 or cherylc @tigard-or.gov. Sincerely, Cheryl Gaines Associate Planner • c: CUP2008-00007 Land Use File r i::,•J I. 61)07tif , AEP,.7HEI D BY: CITY OF TIGARD PLANNING9��I�{VIIS ON0 ;' LAND USE PERMIT APPL'I, �TA ON 8 City of Timid Penrit Center 13125 S W HaII Bl zd, Ti zrt �'R��9,72=23 • • Phone. 503.639.4171 'Fax:503.598.1960 c- �/iift? File# C p A g_0-08-utruo7 Other Case# ` it..afrjr,,°p•op°3 i 5c2 g-_ot,0U`F Date Z i t°I U'5 By S' Receipt# r -. g Fee ((t 4T4h" Date Complete TYPE OF PERMIT YOU ARE APPLYING FOR . ❑ Adjustment/Variance(I or II) ❑Minor Land Partition(II) ❑ Zone Change (III) [Comprehensive Plan Amendment(IV) ❑Planned Development(III) ❑ Zone Change Annexation(IV) ❑ Conditional Use(III) 21.Sensitive Lands Review(I,II or III) .❑ Zone Ordinance Amendment(IV) ❑Historic Overlay(II or III) ❑Site Development Review(II) ❑Home Occupation(II) ❑Subdivision(II or III) LOCATION WHERE PROPOSED ACTIVITY WILL OCCUR(Address if available) 1 )0 < k\)' TAX MAPS&TAX LOT NOS. 2l 'lcco -TL 1-zoo TOTAL SITE SIZE ZONING CLASSIFICATION 24 ,-13 AC 1- L APPLICANT* MAILING ADDRESS/QTY/STATE/ZIP , PHONE NO. FAX NO. PRIMARY CONTACT PERSON PHONE NO. PROPERTY OWNER/DEED HOLDER(Attach list if more than one) • MAILING ADDRESS/QTY/STATE/ZIP • PHONE NO. FAX NO. "When the owner and the applicant are different people, the applicant must be the purchaser of record or a lessee in possession with written authorization from the owner or an agent of the owner. The owners must sign this application in the space provided on the back of this form or submit a written authorization with this application. a PROPOSAL SUMMARY(Please be specific) ' ..0 et llah 1'K4..... • It V1 'L dc. ' .. u1 t.‘.t.i-t a io,k eA,4-w►„n►-, 1.-,./A.1.1 • .i- A-o -Wt. s.,b• c th '. 1-1.0 . Aid A;fi t,I sons;rht `IA-..d N tic. tvx A...LA mac. irtNiw J • ( 1 A'C. , . L.rt. ...A,d 0�.t.a1 c.'}'1 A.S%oc i c. to 4.— Y'-t. r-1:1)41 yt c -e_NL tNN7-1_. • • APPLICATIONS WILL NOT BE ACCEPTED WITHOUT ALL OF THE REQUIRED SUBMITTAL ELEMENTS AS DESCRIBED IN THE "BASIC SUBMITTAL REQUIREMENTS” INFORMATION SHEET. is\curpin\masters\land use applications\land use permit app.doc ra THE APPLICANT SHALL CERTIFY THAT: ♦ If the application is granted, the applicant shall exercise the rights granted in accordance with the terms and subject to all the conditions and limitations of the approval. ♦ All the above statements and the statements in the plot plan, attachments, and exhibits transmitted herewith, are true; and the applicants so acknowledge that any permit issued, based'on this application,map be revoked if it is found that any such statements are false. ♦ The applicant has read the entire contents of the application, including the policies and criteria, and understands the requirements for approving or denying the application(s). • SIGNATURES OF EACH OWNER OF THE SUBJECT PROPERTY ARE REQUIRED.71?71..c,r 1,tr. AAszoies_ Owner's Signature Date . Owner's Signature Date Owner's Signature Date Owner's Signature Date Owner's Signature Date • • Applicant/Agent/Representative's Signature Date • • Applicant/Agent/Representative's Signature Date • LiT15 O;'TIGARD Date: LAND USE APPLICATIONS BASIC SUBMITTAL REQUIREMENTS Project: FIBL (/SL APPLICATIONS WILL NOT BE ACCEPTED IN PARTIAL SUBMITTALS. ALL ITEMS MUST BE SUBMITTED AT ONE TIME. ➢ Include this form with submittal packet. The applicant must check the box next to the item verifying that the information is present. Staff will check off the items at intake. ➢ Three copies of all materials are required for the initial review process. The balance of the copies will be requested once your submittal is deemed complete. > Each packet must be collated. > Plans are required to be a minimum of 24" x 36". ➢ Plans must be FOLDED, rolled plans are not accepted. Applicant Staff Documents, Copies and Fees Required Completed Master"Land Use Permit"Application with property owner's signature or ✓ name of agent and letter of authorization ✓ Title transfer instrument or grant deed ✓ Written summary of proposal / Narrative demonstrating compliance with all applicable development standards and approval criteria (as specified in the Pre-Application Conference notes) Documentary evidence of Neighborhood Meeting: Neighborhood Meeting Affidavits of Posting&Mailing Notice,Minutes,Sign-in Sheets Service Provider Letter • Impact Study per Section 18.390.040.B.2(e) ✓ Copy of the Pre-Application Conference notes Filing Fee (see fee schedule) N/R Preliminary Sight Distance Certification Preliminary Storm Calculations )J/" Traffic Report(if Required) Maps or Plans (Plans must be at least 24"x 36") Architectural Drawings (elevations & floor plans) Existing Conditions Map Landscape Plan Preliminary Grading/Erosion Control Plan Preliminary Partition/Lot Line Adjustment Plan Preliminary Storm Drainage Plan • Preliminary Utilities Plan • Public Improvements/Streets Plan • Site Development Plan Subdivision Preliminary Plat Map • Topography Map Tree Preservation/Mitigation Plan • Vicinity Map ➢ Once your application has been deemed complete you will need to provide: Two (2) sets of stamped, addressed #10 envelopes for all owners of property within 500 feet of the subject property. Mailing envelopes shall be standard legal-size (#10), addressed with 1"X 4" labels (see envelope submittal requirements). Property owner mailing lists must be prepared by the City for a minimal fee (see request for 500' property owner mailing list form). I:\CURPLN\biasters\Submittal Requirements Check Liscdoc CITY OF TIGARD 7/10/2008 Er PM 131 2;SW Hall Blvd. E Tigard,OR 97223 503.639.4171 TIGARD Receipt #: 27200800000000002443 Date: 07/10/2008 Line Items: Case No 'Tan Code Description Revenue Account No Amount Paid SLR2008-00003 [LANDUS] 50%Joint App Fee 100-0000-438000 1,128.00 SLR2008-00003 [LRPF] LR Planning Surcharge 100-0000-438050 167.00 SLR2008-00004 [LANDUS] 50%Joint App Fee 100-0000-438000 1,128.00 SLR2008-00004 [LRPF] LR Planning Surcharge 100-0000-438050 167.00 Line Item Total: $2,590.00 Payments: Method Payer User ID Acct./Check No. Approval No. How Received Amount Paid Check F W FIELDS DEB 8686 In Person 2,590.00 Payment Total: $2,590.00 • ckcecipt.rin Page 1 of 1 IMPCITY OF TIGARD 7/10/2008 13125 SW Hall nhd. 2:40:18PM Tigard,OR 97223 503.639.4171 TIGARD Receipt #: 27200800000000002438 Date: 07/10/2008 Line Items: Case No Tran Code Description Revenue Account No Amount Paid CPA2008-00007 [LANDUS] Comprehensive Plan 100-0000-438000 7,742.00 CPA2008-00007 [LRPF] LR Planning Surcharge 100-0000-438050 1,144.00 SLR2008-00003 [LANDUS] Application-Type III 100-0000-438000 . 2,256.00 SLR2008-00003 [LRPF] LR Planning Surcharge 100-0000-438050 334.00 Line Item Total: $11,476.00 Payments: Method Payer User II) Acct./Check No. Approval No. Dow Received Amount Paid Check F W FIELDS ST 8686 In Person 11,476.00 • Payment Total: $11,476.00 CReeeipt.rpt Page 1 of I ,,•)RrlANU ,•n, 3400 U.S.BancorpTowrr {{ I I I S.W.Fifth Avenue Portland,Oregon 97204-3699 M I LLER NAS H OFFICE 503.224.5658 c.NTRAL OREGON FAX 503.224.0155 "�}s O41 .• .•.t `A WW.M ILLERNASH.C ()M William L.Rasmussen RECEVE° tvilliant.rasmussen(a millernash.com 0 e i) 2009 J (503)'o5-":;o8 direct line FEB February'5, 2009 Mr. Ron Bunch Community Development Director City of Tigard Yi a Department of Community Development Current Planning Division I II 13125 S.W. Hall Boulevard Tigard, Oregon 97223 i Subject: Sensitive Lands Review/Comprehensive Plan Amendment/Tree Removal Applications (CPA 2008-00007, SLR 2008-00003, SLR 2008-00004) Dear Mr. Bunch: As you know, this office represents Mr. Fred Fields in his above- mentioned applications which were filed with the City on July 10, 2008. As part of the ,a completeness review, the City asked Mr. Fields for additional information in order to process the above-referenced applications. We have provided that information to the best of our ability. For purposes of ORS 227.178(4), we are hereby notifying the City under ORS 227.178(4)(b) that "no other information will be provided." We respectfully request that the City process these applications based on the information that we have provided as of this date, including the response narrative with supporting attachments and exhibits submitted today. . ._ Respectfully submitted, tA,,/ William L. Rasmussen cc: Ms. Cheryl Caines Mr. Dick Bewersdorff Mr. Tim Ramis -� Mr. Fred Fields s; Mr. Tom Wright Mr. Rhys Konrad Mr. Clayton Hering PDXDOCS:1816604.1 196080-2001 ,tiv I • . I = GROUP MACKENZIE ' IFebruary 5, 2009 I City of Tigard Attention: Cheryl Caines • 13125 SW Hall Boulevard I - Tigard, OR 97223 Re: Completeness Response CPA2008-00008 I . Project Number 2070334.02 M N c co • N N • Dear Cheryl: ' P 0, N o = The following information has been prepared in response to your letter of incomplete ii -- application submittal dated August 8, 2008 regarding the request for comprehensive plan c o I o w - 0 approval to remove the significant wetlands determination in order to extend Wall Street to E serve Mr. Fields' property. We have addressed the items below, with our responses CL ll --- following your comments.With this additional information,we feel that the burden of proof o o. has been substantially met and no additional information is necessary to deem the proposed o m application complete. Our intent with this submittal is to clarify the pertinent details of this O N application so as to better articulate the proposed extension and demonstrate compliance with I a — the approval criteria. 3 —_ APPLICATION OVERVIEW - V N to 111 w Our initial application provided a detailed executive summary of the proposed application. M ___ The following items will help clarify the intent and details of the requested application: m •H • The City has designated Wall Street as a collector on its TSP, with an alignment that extends from Hall Boulevard to Hunziker Street. IGroup • The City granted an access easement for the purposes of providing access to Mr. Mackenzie, Fields' property in the general location of the TSP designation. Incorporated • This is the only alternative access option available to serve Mr.Fields'property.Metro Architecture provided a letter indicating that access through their property at the south end of the IInteriors • subject site will not be allowed. This letter is attached as Exhibit 10. Structural • A first phase extension from Hall Boulevard was completed with the Library project Engineering primarily to serve the Library and Fanno Pointe Condominiums and included: Civil Engineering • Reconfiguration of Pinebrook Creek. Land • Use Planning • .11 acres of wetland impacts. Transportation • Mitigation included a stream channel and wetland creation of 0.08 acres, Planning I Landscape Architecture • wetland enhancement of 0.29 acres, and wetland restoration of 0.20 acres. US Army Corps of Engineers (Corps)/Oregon Department of State Lands (DSL)/Clean Water Services (Clean Water Services) permits for the wetland Locations: IPortland,Oregon impacts. Seattle,Washington • Mitigation was approved in such a level that included the proposed impacts of Vancouver,Washington Phase 2 (current proposal). Based upon review of construction documents associated with Phase 1,this mitigation has already been constructed. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I : 1 ' City of Tigard Completeness Response Project Number 2070334.02 ' February 5, 2009 Page 2 ' • A detailed Alternatives Analysis was performed as part of the Phase 1 approval, resulting in an alignment consistent with the proposed extension and TSP designation. • The proposed extension will require that a 320 ft. bridge be constructed over Fanno • Creek from the current terminus into the property owned by Mr. Fields. Impacts associated with this extension will require minor modifications to the Phase 1 improvements and. • .19 acres of wetland impacts; • 320-foot bridge extension over Fanno Creek; ail • No impacts to Fanno Creek or its floodway are proposed; and • Mitigation was included in the Phase 1 approvals, and has already been constructed indicating that no additional mitigation is necessary for this proposal. The stream,pond,and wetland impacted by the proposed road extension are mapped on the City of Tigard's Wetlands&Stream Corridors Map.A Comprehensive Plan Amendment is required to remove the locally significant designation from the impacted wetlands, which effectively removes Goal 5 protection under Section 18.775.120 of the City of Tigard Development Code.The Sensitive Lands Review is required for the proposed extension due to the impacts to wetland areas.As detailed in the original submittal,as well as through the ' following section, the proposed extension is consistent with the approval criteria. DETAILED RESPONSES TO INCOMPLETE ITEMS 1. Based on Comprehensive Plan Policy 2.1.15 the transportation and public facilities shall be available or committed to be made available, or ofsufficient capacity to serve the land uses allowed by the proposed map designation. Therefore, the zone change application must follow the access application. Response: The City requires that sufficient transportation facilities be available or made available to serve development.Both the application for a comprehensive plan/zone change and the Phase 2 street extension were submitted concurrently in order to fulfill this requirement,and by submitting this application,Mr.Fields has fulfilled his responsibility to commit to the extension of transportation facilities. The proposed zone change does not prohibit necessary transportation and/or public facilities from being provided to the site. Regardless of what zoning designation is ultimately applied to the subject site, no development can take place without sufficient transportation facilities. 2. Comprehensive Plan Policies tEnvironmental Quality—Goal 6.2 Ensure land use activities protect and enhance the community's water quality. Response:As mentioned in the application,the proposed bridge extension will span Fanno Creek and its floodway,with minor floodway/floodplain impacts due to placement of bridge pile supports. Actual installation of the bridge will be subject to a DEQ 1200C permit and Corps/DSL Section 404 permit allowing work within waterways. Such permits require ' H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 3 extensive erosion control measures to prevent siltation of waterways during construction activity.No increase in downstream turbidity exceeding 10%of natural background turbidity is permitted. Once the bridge is constructed, a stormwater system will convey runoff from the bridge to water quality facilities(i.e.,vegetated swales). Stormwater treatment facilities as well as erosion control measures will ensure that the community's water quality is protected. These permits and measures have already.been designed and approved by the necessary agencies. Policy 3. The City shall encourage the use of low impact development practices that reduce stormwater impacts from new and existing development. Response: Although the standards applying to public road construction somewhat limit the extent to which low impact development techniques can be used, nearly all available low impact solutions were selected for this project.An example would be the use of a longer 320 ft. bridge span, which will help preserve much of the existing vegetation within the floodway.Also,the use of water pre-treatment and bioswales will both ensure a high level of water quality and enhance the natural environment. In summary, the project utilizes low impact design alternatives to the greatest practical extent and thereby is consistent with this policy. Policy 4. The City shall protect, restore, and enhance, to the extent practical, the natural functions of stream corridors, trees, and water resources for their positive contribution to water quality. Response: Original plans were determined to result in improved stream conditions for both Pinebrook and Fanno Creeks and included a restoration of Pinebrook Creek to its natural configuration. This included reduced thermal pollution to Fanno Creek, better fish habitat (from the new Hall Blvd.culvert),and increased water storage created by wetland creation in Phase 1. High-density wetland plantings have been provided in all impacted and restored areas. Additionally, the earthen berm along the south edge of the east pond,which cuts off historically active wetlands,was removed to restore those wetlands.Please see Attachment B of the Wall Street Joint Permit Application(Exhibit 2)for additional details.The proposal is consistent with this policy. All mitigation and necessary agency permits were obtained during Phase 1, and the associated impacts of both phases have already been mitigated. Additional mitigation as required by CWS will be re-approved and constructed with the proposed extension. It is anticipated to include additional wetland buffer on Mr. Fields' property and even denser plantings.Although a Corps/DSL Section 404 permit has already been obtained with at least one extension granted, a new permit with revised mitigation measures will need to be obtained. Erosion control measures will likely be similar to what was proposed with the 1 initial Corps/DSL permit application, which expired on January 27, 2008. Policy 5. The City shall require measures to minimize erosion and storm run-off from development sites during and after construction. Response:The project will include an erosion control plan meeting both City of Tigard and CWS requirements. In addition,the project will meet the erosion control and water quality conditions contained in the DSL and Corps wetland permits and in the water quality H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc 1 City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 j Page 4 certification issued by DEQ as part of the Corps permit. Erosion control measures will be regularly inspected and maintained during project construction. The project will be consistent with this policy through the implementing measures discussed above. Policy 7. The City shall investigate and use, to the extent practical, measures that limit the community's effective impervious area. Response:A new street extension requires that some impervious area be created in order to provide.for safe transportation conditions.To minimize the impacts of impervious area,the proposed application includes treating stormwater through the existing water quality facility located near the City Library, as well as an additional bioswale with an outfall into the existing wetland area. These measures are considered best practices for treating runoff created by impervious areas.Further,the impervious area proposed is the minimum required to construct the public facility. The proposal is consistent with this standard. Hazards—Goal 7.1 Protect people and property from flood, landslide, earthquake,wildfire, and severe weather hazards. Response: The proposed bridge extension does not affect the City's protection against potential hazards listed above. The bridge will be designed to meet all applicable design standards and will be elevated above the 100-year floodplain. The proposal is thereby consistent with this goal. Policy 8. The City shall prohibit any land form alterations or developments in the 100-year- floodplain which would result in any rise in elevation of the 100 year floodplain. Response: The proposed application does not propose any impacts in the 100-year floodplain other than those associated with the placement of bridge pile supports. The conclusions of the Hydraulic Analysis (Exhibit 5) state that the base flood and floodway water surface elevations upstream of the proposed bridge would be less than the design base flood elevation of the City Library. However, in order to prevent increase in the base flood elevation,the bridge would have to span a length of 320 ft.As currently proposed,the bridge will span at least 320 ft. (Plan 5). The bridge pile supports cause no impacts to the 100-year 1 floodplain (Exhibit 5,page 8), and post-development conditions are anticipated to actually increase water storage due to wetland restoration. 1 Policy 9. The City shall not allow land form alterations or development within the 100 year floodplain outside the zero foot rise floodway unless: A. The streamflow capacity of the zero foot rise floodway is maintained; and -� B. Engineered drawings and/or documentation shows there will be no detrimental upstream or downstream effects in the floodplain area. Response: Please see the response to Policy 8 above and the Hydraulic Analysis and plans included as exhibits to the application.In summary,the proposed bridge development within the 100-year floodplain will maintain a"zero-foot rise"floodway as described on page 8 of Exhibit 5, "As shown in the delineation of the 100-year flood boundaries for Plan 5, the proposed bridge would not cause a significant increase in the 100-year flood boundaries upstream of the structure." H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I 1 City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 5 Policy 10. The City shall work with Clean Water Services to protect natural drainageways and wetlands as valuable water retention areas and, where possible,find ways to restore and enhance these areas. Response:The Phase 1 application included a Service Provider Letter(SPL)from CWS for, the proposed impacts related to the bridge extension. A revised SPL is under consideration by CWS and no work will be undertaken until that letter is issued.The intent of this policy is met through the applicant's previous SPL and current work with CWS to obtain a revised letter. Policy 11. The City shall comply with Metro Title 3 Functional Plan requirements for balanced fill and removal in the floodplain. Response: Filling of wetlands planned in conjunction with Phase 2 was completed during Phase 1. Significant additional filling activities are not currently planned,but should filling be necessary as part of Phase 2, cut/fill balance standards will be observed. 1. The City shall not allow development in areas having the following development limitations except where the developer demonstrates that generally accepted engineering techniques related to a specific site plan will make the area suitable for the proposed development: A. areas having a severe soil erosion potential; B. areas subject to slumping, earth slides, or movement; C. areas having slopes in excess of 25%; or D. areas having severe weak foundation soils. Response:A 2003 geotechnical report(Exhibit 3)showed that,while the soils underpinning the impact area are relatively light,no special construction techniques or equipment should be required. This report generally concluded that the proposed earthwork activities are feasible without undermining the bank slope or causing soil erosion.Furthermore,significant slopes in excess of 25% are not anticipated to be impacted. This proposal satisfies this policy. 2. The City shall favor the use of non-structural approaches to hazard mitigation. Response: As the proposal is for construction of a roadway and a bridge, structural approaches to hazard mitigation must be provided as part of general construction best practices for bridge construction. These typically include anchored support footings and retaining walls below the bridge to prevent the erosion of ramp subgrade. Such measures are the minimal necessary for bridge construction;therefore,the proposal is consistent with this 1 standard. 3. The City shall coordinate land use and public facility planning with public safety providers (law enforcement,fire safety, and emergency service providers) to ensure their capability to respond to hazard events. Response:While this policy is for the City to implement,there are no apparent problems for providing police/fire/life safety to the facility. It should also be noted that all service providers were consulted as part of the TSP update that included the Wall Street extension plans, which are now proposed for implementation. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I I City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 6 4. The City shall design and construct public facilities to withstand hazardous events with a priority on hazard protection of public services and facilities that are needed to provide emergency response services. • Response:The roadway was designed by consultants contracted by the City and will be able 1 to withstand anticipated flood and emergency events.The facility will,in fact,provide better access for emergency vehicles to affected properties. S. The City shall apply and enforce the most current building code standards to protect i/ the built environment from natural disasters and other hazards. Response: This policy is for the City to implement and does not apply to this application. Conformance with all stipulated building code standards for public construction will be evaluated at the time of permitting and monitored throughout development. 6. The City shall enforce standards requiring the creation and maintenance of defensible space around habitable structures located in wildfire hazard areas. Response: No habitable structures are proposed in this application. This policy does not Japply. 7. The City shall comply with the Federal Emergency Management Agency(FEMA)flood regulations, which include standards for base flood levels, flood proofing, and ' minimum finished floor elevations. Response:This application has provided substantial evidence demonstrating that no adverse impacts to the base flood elevation will result from street construction,and that all applicable Corps/DSL, and CWS permits have been obtained. To summarize these findings, the elevation of the roadway and bridge will be above the FEMA-mapped 100-year floodplain as described in the 2003 Hydraulic Analysis Report.The proposal is consistent with this policy. 8. The City shall prohibit any land form alterations or developments in the 100-year floodplain which would result in any rise in elevation of the 100 year floodplain. '1 Response: The proposed application does not propose any significant impacts in the 100- year floodplain other than those associated with the placement of bridge pile supports. The conclusions of the Hydraulic Analysis (Exhibit 5) state that the base flood and floodway water surface elevations upstream of the proposed bridge would be less than the design base flood elevation of the City Library. However, in order to prevent increase in the base flood elevation the bridge would have to span a length of 320 feet. As currently proposed, the ' bridge will span 320 feet with minor impacts resulting from the necessary bridge pile supports ensuring compliance with the conclusions of the Hydraulic Analysis and no impacts to the 100-year floodplain. 9. The City shall not allow land form alterations or development within the 100 year floodplain outside the zero foot rise floodway unless: A. The streamflow capacity of the zerofoot rise floodway is maintained; and B. Engineered drawings and/or documentation shows there will be no detrimental upstream or downstream effects in the floodplain area. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I I City of Tigard Completeness Response Project Number 2070334.02 1 February 5, 2009 Page 7 I Response: As previously indicated,there will be an increase in the capacity of the affected portion of the 100-year floodplain with the proposed extension. The Revised Wall Street Alternatives Analysis (March 2005) indicated that the preferred alternative for bridge construction (which is here again proposed) does not present any detrimental upstream or I downstream impacts that would result from the proposed Wall Street extension. In fact,the Alternatives Analysis (Exhibit 1) showed that an extension of the Wall Street would have positive benefits on the streamflow of Pinebrook and Fanno Creeks by re-directing the flow I on Pinebrook Creek and disconnecting it from a nutrient-rich pond. "Reconnecting Pinebrook Creek to this historic channel and taking the East Pond off-line from Pinebrook Creek will eliminate overflows of warm,nutrient-rich water from the East Pond into Fanno ICreek." . The creation/restoration of wetlands in the area of the two ponds during Phase 1 was I predicted to have positive affects on water storage capacity during flood events. Phase 2 improvements have been shown not to increase the level of the 100-year floodplain because the bridge itself will be elevated significantly above the base flood elevation. IFurther, Corps/DSL requirements prohibit downstream siltation/water quality impacts and prescribe a monitoring program to ensure that such impacts do not occur. Given that the project will not increase the severity of the mapped 100-year floodplain, because water I storage capacity was increased with Phase 1, and because it will very likely cause improvements to the upstream and downstream water quality,the proposal is consistent with this policy. I10. The City shall work with Clean Water Services to protect natural drainageways and . wetlands as valuable water retention areas and, where possible,find ways to restore I and enhance these areas. nse:CWS reviewed the original 2005 Sensitive Lands permit application and required . additional planting to mitigate impacts to, and restore, the nearby vegetated corridors. IRevegetation is described as follows (Exhibit 6): Mitigation site planting will incorporate a mixture of emergent and forested/scrub- I shrub planting areas. Shrubs will be planted along the top of stream bank of the reconfigured Pinebrook Creek.Stream-associated wetland terraces will be seeded with the wetland planting mix, and sedges and rushes will be planted in the central depression areas. The reconfigured West and East Ponds and the wetland I respiration/berm removal area will be seeded and planted with native tress and shrubs to create forested/scrub-shrub wetlands. I It is anticipated that additional plantings will be required by CWS and will be provided by the applicant.The end result of these plantings will likely be an enhanced drainageway and wetland near the proposed street extension. The proposal is consistent with this policy. 1 IH:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc i 1 1 City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 8 11. The City shall comply with Metro Title 3 Functional Plan requirements for balanced fill and removal in the floodplain. Response: Metro Title 3 broadly sets forth performance standards governing impacts to floodways,floodplains,and drainageways.These include standards related to water quality, vegetated corridors, and erosion/sedimentation. Although this is now an applicant-driven • infrastructure proposal, it largely builds upon the plans completed by the City for the same extension project in 2005. There will be no increase in the base flood elevation because significant filling within the floodplain and floodway is not proposed for Phase 2, and mitigation for both phases was installed as part of Phase 1. As described in the March 4, 2005 memo from DeHaas&Associates,work within the floodplain,"consists of 135 [cubic yards] of fill and 1,076 [cubic yards] of excavation for a net total of 941 [cubic yards] of excavation" (Exhibit 9). Primary impacts for Phase 2 are the structural supports for the bridge and do not require large amounts of fill. Sufficient evidence has been submitted in order to show that compliance with Title 3 is feasible,and because most of Title 3 sets forth performance rather than design standards,conformity will be monitored during development. 12. The City shall encourage pervious,and minimize impervious,surfaces to reduce storm water runoff. Response: As discussed in the 2005 Alternatives Analysis,proposed stormwater facilities will be sufficient to accommodate the increased stormwater runoff created by additional impervious area. However, pervious paving is not an appropriate surface for a bridge. As impervious surfaces have been minimized, the proposal is consistent with this policy. 13. The City shall retain and restore existing vegetation with non-invasive species in areas with landslide potential to the greatest extent possible. Response: There is no landslide potential identified on the impact area of the proposed project. This policy does not apply. 14. The City shall work to reduce the risk of loss of life and damage to property from severe weather events. Response: This policy does not apply to the proposed infrastructure project. Summary As demonstrated in the consideration of the sections above,the proposal is consistent with the specified portions of the Tigard Comprehensive Plan. 3. The following items are out-of-date or not specific to the project: Clean Water Services SPL Response: The previous application included approved mitigation to the sensitive areas under the jurisdiction of CWS. Although the SPL has since expired, the applicant is confident that a revised and updated permit can be obtained as there has been no change in the proposed design from the previous application. CWS standards are likely to require an increase in the density of mitigation plantings and/or wider wetland buffers. r H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc 1 I I City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 9 ESEE Analysis Response:A project-specific ESEE is included in this completeness response as Exhibit 11. Alternatives Analysis ' Response:The Alternatives Analysis(included in this completeness response as Exhibit 1), states in the first paragraph that it included the full extension of Wall Street as previously proposed.This analysis is applicable to the proposed extension as it was previously included ' in the full extension of Wall Street. This analysis also included nine different alignment/bridge alternatives, and the preferred alternative is proposed here. ' 4. Plans.Please provide plans that clearly show the proposed alignment and design of Wall Street, the specific affected portions of sensitive lands and work proposed within these areas, affected parcels, and any mitigation that is proposed. Plans must be 24"x 36". 1 Response: Larger plans are attached to help facilitate a better level of understanding regarding the proposed Wall Street extension.In addition,smaller plans have been formatted to provide the greatest level of detail and understanding of the proposal. 5. Sensitive Lands Review. Please re-address this code section with facts,findings and conclusions to support how the code requirements are met.Please do not refer the reader to the attachments to find the information. What are the measures taken to ensure control of erosion and eliminate stream sedimentation?Please describe the work proposed within the sensitive lands. In regards to wetlands,please distinguish between impacts to highly rated wetlands from those that are either man-made or are not designated as significant. Response: All sensitive lands criteria are addressed below. With respect to wetland significance,all impacted wetlands are designated as"significant wetlands"based on City of Tigard GIS. The East Pond is a man-made wetland that is proposed to be impacted and mitigated based upon the attached plans. 1. Land form alterations shall preserve or enhance the floodplain storage function and maintenance of the zero foot rise floodway shall not result in any encroachments, including fill,'new construction, substantial improvements and other development unless certified by a registered professional engineer that the encroachment will not result in any increase in flood levels during the base flood discharge; ' Response: According to the Wall Street Alternatives Analysis (Revised March 2005), approximately.55 acres of the 100-year floodplain would be disturbed.The street has been designed so that there will be no increase in the zero-foot rise floodway and no increase in the water surface elevation of the 100-year floodplain. According to a memo completed by DeHaas &Associates on March 4, 2005 (Exhibit 9), a net reduction in material will result from construction of Phase 1: • As indicated in the Scope of Work Phase 1 construction earthwork in the floodplain consists of 135 [cubic yards] of fill and 1,076[cubic yards] of excavation for a net total 941 [cubic yards] excavation. Accordingly, Phase I construction enhances the floodplain storage function. 1 H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I 1 City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 10 Additionally,the 320 ft.bridge(preferred option)would allow a connection without raising the level of the 100-year floodplain,as described in the Hydraulic Analysis Report by West Consultants, dated July 9, 2003 (Exhibit 5): tThe results...indicate that the proposed bridge would have to have a span length of 320 feet to prevent to the increase in the base flood elevations...Finally, as shown in the delineation of the 100 year flood boundaries...the proposed bridge would not 1 cause a significant increase in the 100 year floodplain boundaries upstream of the structure and the only noticeable different would exist within the reach from the proposed bridge and Hall Blvd." IGiven that Phase 1 increased water storage and that Phase 2 will not increase the level of the 100-year floodplain, this standard is met. 2. Land form alterations or developments within the 100 yearfloodplain shall be allowed only in areas designated as commercial or industrial on the comprehensive plan land use map, except that alterations or developments associated with community recreation uses, utilities, or public support facilities as defined in Chapter 18.120 of the Community Development Code shall be allowed in areas designated residential subject to applicable zoning standards; fResponse:This project is located within an area designated for industrial uses.Wall Street is a public support facility called for by the Street Improvement Plan of the City's Transportation System Plan,which has been adopted by the City Council and acknowledged by DLCD. This standard is met. 3. Where a land form.alteration or development is permitted to occur within the ' floodplain it will not result in any increase in the water surface elevation of the 100- year flood; Response: As previously discussed under No. 1, a net increase in floodwater storage capacity resulted from Phase 1,and Phase 2(with a 320 ft.bridge)will not increase the flood level. Additional details on floodplain impacts are contained in the Hydraulic Analysis (Exhibit 5). The proposal is consistent with this standard. 4. The land form alteration or development plan includes a pedestrian/bicycle pathway in accordance with the adopted pedestrian/bicycle pathway plan, unless the construction I of said pathway is deemed by the Hearings Officer as untimely; Response: The plans for the Wall Street extension include two 6'-wide bicycle lanes and sidewalks. The proposal is consistent with this standard. 5. The plans for the pedestrian/bicycle pathway indicate that no pathway will be below the elevation of an average annual flood; Response: The 100-year floodplain elevation is 141.4 ft. The pedestrian and bicycle paths, 1 as well as the roadway,will all be constructed above elevation 146 ft. This is demonstrated by plans originally commissioned by the City(see sheet 7 of 14).The proposal is consistent with this standard. I H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc 1 I ' City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 11 6. The necessary U.S. Army Corps of Engineers and State of Oregon Land Board, ' Division of State Lands, and CWS permits and approvals shall be obtained; and Response: This standard requires that permits be obtained prior to development. Wetland permits have been received from the US Army Corps of Engineers(Corps#200300137)and the Oregon Department of State Lands (DSL #31719-RF). A Service Provider Letter has been obtained from Clean Water Services(CWS File No.4203)and a revised CWS SPL has been requested.In summary,a complete set of permits from jurisdictions governing impacts ' to wetlands was compiled at the time of the previous Sensitive Lands application. These permits have since expired, and new Corps and DSL permits will be obtained prior to development. A revised CWS permit is in process. The proposal thereby satisfies this ' criterion. 7. Where land form alterations and/or development are allowed within and adjacent to I the 100 year floodplain, the City shall require the consideration of dedication of sufficient open land area within and adjacent to the floodplain in accordance with the comprehensive plan. This area shall include portions of a suitable elevation for the construction of a pedestrian/bicycle pathway within the floodplain in accordance with the adopted pedestrian/bicycle pathway plan. Response: The City-owned area north of the Tigard Library is currently utilized as parkland/open space and has some limited pedestrian/bicycle pathways. As the City owns most of the property subject to this proposed street extension, there will be no practical limitation to constructing a pedestrian/bicycle pedestrian path in the wetland area.Where the street is extended into the Fields Property, undevelopable wetlands can be reserved for a ' future public path as no site development will occur there. This may occur through a dedication or other mechanism to ensure long-term protection.The proposal can comply with this criterion. ' D. Within drainageways. The appropriate approval authority shall approve,approve with conditions or deny an application request for a sensitive lands permit within drainageways based upon findings that all of the following criteria have been satisfied: 1. The extent and nature of the proposed land form alteration or development will not create site disturbances to an extent greater than that required for the use; 1 Response: As part of the initial 2002-2005 planning effort, an Alternatives Analysis was prepared for the wetland permit application in order to minimize proposed impacts to Pinebrook Creek and associated wetlands. The proposed stream and wetland impacts have been reduced to the minimum necessary in order to construct the project, and proposed impacts were previously approved by the DSL and the Corps. The Alternatives Analysis is included as Exhibit 1.As demonstrated on the plans originally submitted,a berm within the ' existing wetland area will be removed to ensure proper bridge clearance. Other alterations include a re-channeling of Pinebrook Creek and removal of the two man-made ponds to increase water quality and reduce thermal pollution.No land form alterations are proposed except those which are directly necessary for construction of the roadway and associated bridge, which will impact approximately .19 acres of wetlands. The proposed Phase 2 extension is in direct compliance with the preferred alternative which ensures the most minimal impacts to natural features. In summary, there are no impacts unrelated to H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc S ' City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 12 ' construction of the facilities already approved in the original Corps/DSL 404 permit. As previously discussed, a net reduction of material within the floodplain will increase flood storage capacity, and the proposed bridge will not increase the base flood elevation. Proposed impacts have been minimized by shifting the roadway alignment north to minimize impacts to the East Pond and narrowing the roadway by eliminating the planter strip where the roadway is in close proximity to wetlands and vegetated corridors.Furthermore,the use of a 320 ft. bridge space (rather than a 160 ft. span) will limit the fill required to cross the wetland. The primary wetland impacts of this bridge will be the pilings used for supports. This criterion is satisfied. I 2. The proposed land form alteration or development will not result in erosion, stream sedimentation, ground instability, or other adverse on-site and off-site effects or hazards to life or property; ' Response: The project will include an erosion control plan meeting the City of Tigard and CWS requirements. In addition,the project will meet the erosion control and water quality conditions contained in the DSL and Corps Section 404 permit, and in the water quality certification issued by DEQ as part of the Corps permit. Erosion control measures will be regularly inspected and maintained during project construction.Such measures as detailed in the Corps/DSL Section 404 permit must be utilized during construction. Furthermore, the original geotechnical assessment(Exhibit 3)did not find any critical hazards which would cause unacceptable amounts of erosion or stream sedimentation. This criterion is met. 3. The water flow capacity of the drainageway is not decreased; Response: Proposed stream and wetland mitigation for Phase 1 of the project included reconstructing Pinebrook Creek and associated wetlands slightly south of their existing location. The goal of this restoration was threefold: to add storage capacity by restoring ' wetland area, to restore fish habitat within the creek, and to decrease thermal pollution in Fanno Creek.An overall increase in floodwater storage was anticipated to result from Phase 1, while Phase 2 would have no significant affect on the flood elevation. A Hydraulic Analysis by West Consultants is included as Exhibit 5.In general,the report concluded,"the proposed bridge structure would not cause a significant increase in the 100-year flood boundaries"because the capacity of the drainageway will not be decreased.As landform and ' stream alterations will result in better flow characteristics than currently addressed, this criterion is satisfied. ' 4. Where natural vegetation has been removed due to land form alteration or development, the areas not covered by structures or impervious surfaces will be replanted to prevent erosion in accordance with Chapter 18.745, Landscaping and ' Screening; Response:All disturbed areas will be seeded and planted upon completion of construction. Where additional CWS buffer mitigation and plantings are required, these areas will be provided in accordance with their requirements. No additional wetland mitigation is ' necessary, as the previously approved mitigation was constructed with the Phase 1 improvements. A new CWS SPL is in process which may impose updated mitigation standards. Additionally, a replanting plan for both Phases 1 and 2 was completed, in conjunction with the original SPL, included as Exhibit 6. Mitigation for Phase 2 includes H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc City of Tigard Completeness Response Project'Number 2070334.02 ' February 5, 2009 Page 13 replanting of 22,305 SF with at least 727 trees and 1,358 shrubs for replacement, and ' replanting of at least 6,025 SF for enhancement. According to the Compensatory Wetland Mitigation Plan(November 2005), constructed mitigation achieved a ratio roughly 1:1 for wetland restoration. Plantings are described as follows: IMiti g ation site planting will incorporate a mixture of emer g ent and forested/scrub- shrub planting areas. Shrubs will be planted along the top of stream bank of the reconfigured Pinebrook Creek.Stream-associated wetland terraces will be seeded with the wetland planting mix, and sedges and rushes will be planted in the central depression areas. The reconfigured West and East Ponds and the wetland 1 respiration/berm removal area will be seeded and planted with native tress and shrubs to create forested/scrub-shrub wetlands. (Exhibit 6) ' To summarize,CWS standards require a higher density of plant material to be replaced than existed prior to work, and all affected area not covered by roadway improvements will be replanted in this way. While the original replanting plan was determined to be in conformance with City and CWS standards in affect at the time,any additional requirements imposed by CWS will be met through a revised planting plan. The proposal can therefore conform to this standard. 1 S. The drainageway will be replaced by a public facility of adequate size to accommodate maximum flow in accordance with the adopted 1981 Master Drainage Plan; Response: A water quality facility will treat runoff from new impervious surfaces with an ' oil/water separator before the water is discharged into an existing bioswale.At this time,it is anticipated that the swale will accommodate the additional runoff caused by impervious area at the west end of the proposed bridge crossing.A stormwater report completed in May 2003 indicated that, "if the extension of Wall Street occurs, the city may elect to use the library Swale to treat the street impervious area. The library swale was evaluated adding the street impervious surface. This evaluation concluded the swale can accommodate the additional street impervious surface."The water quality facility was designed to meet City of Tigard and CWS requirements at the time, and was constructed with Phase 1. Detention of stormwater is not required,as indicated in the stormwater report,"The site discharges into ' . Fanno Creek, which lacks downstream flow capacity restriction. In the absence of downstream impacts, detention was not included in the project." A new bioswale is proposed to be constructed east of Fanno Creek to treat runoff from Phase 2 consisting of the proposed bridge and associated sidewalks. A detailed description of the proposed facility is included in Attachment B of the original joint Corps/DSL removal/fill permit(Exhibit 2).Generally speaking,the trapezoidal bioswale will be 169 ft.long,with a 6 1 ft.bottom width,maximum treatment depth of.5 ft.,4:1 sloped banks,and a channel slope of .05%.The designers,DeHaas&Associates,indicated that,"The Phase 2 bioswale was sized to accept the impervious surfaces from the Wall Street roadway and sidewalks created by Phase 2 of the project(4.6 acres)."As sufficient stormwater facilities have been constructed to serve both phases of the project, this standard is met. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc 1 City of Tigard Completeness Response Project Number 2070334.02 ' February 5, 2009 Page 14 6. The necessary U.S. Army Corps of Engineers and State of Oregon Land Board, Division of State Lands, and CWS approvals shall be obtained; Response: Wetland permits have been received from the US Army Corps of Engineers (Corps #200300137) and the Oregon Department of State Lands (DSL #31719-RF). A ' Service Provider Letter has been obtained from Clean Water Services(CWS File No.4203) and a revised CWS SPL has been requested. In summary, a complete set of permits from jurisdictions governing impacts to wetlands was compiled at the time of the previous ' Sensitive Lands application. Where Corps and DSL approval has expired, revised permits will be obtained prior to beginning any work. The proposal thereby satisfies this criterion. 7. Where land form alterations and/or development are allowed within and adjacent to the 100 year floodplain, the City shall require the consideration of dedication of sufficient open land area within and adjacent to the floodplain in accordance with the Comprehensive Plan. This area shall include portions of a suitable elevation for the construction of a pedestrian/bicycle pathway within the floodplain in accordance with the adopted pedestrian bicycle pathway plan. ' Response: The City-owned area north of the Tigard Library is currently utilized as parkland/open space, and has some limited pedestrian/bicycle pathways. As the City owns most of the property subject to this proposed street extension, there will be no practical limitation to constructing a pedestrian/bicycle pedestrian path in the wetland area.Where the ' street is extended into the Fields Property, undevelopable wetlands can be reserved for a future public path as no site development will occur there. At the time of development,the wetland mitigation area within the Fields Property will be protected through creating a tract ' or other method to ensure its long-term protection as open space as required by CWS. The proposal can comply with this criterion. ' E. Within wetlands. The Director shall approve, approve with conditions or deny an application request for a sensitive lands permit within wetlands based upon findings that all of the following criteria have been satisfied: ' 1. The proposed land form alteration or development is neither on wetland in an area designated as significant wetland on the Comprehensive Plan Floodplain and Wetland Map nor is within the vegetative corridor established per "Table 3.1 Vegetative Corridor Widths" and Appendix C: Natural Resources Assessments" of the CWS "Design and Construction Standards",for such a wetland; Response: The proposed roadway alignment impacts 0.19 acres of wetland designated as significant on the Comprehensive Plan "Wetlands & Stream Corridors" map. A wetland mitigation plan has been approved by the Corps and the DSL as part of the wetland permits issued for the project(Exhibit 2).Revised permits will be obtained prior to development.In ' general, wetland impacts are described as follows: Wetland impacts for Phase 2 include 0.19 acre to construct the westerly bridge wingwall and the roadway and fill sloped for the remainder of the project. Proposed wetland impacts are mainly to Pinebrook Creek [Phase 1 only] and associated emergent/scrub-shrub wetlands which are heavily invaded by invasive species.Minor H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 ' Page 15 wetland impacts are proposed to the West Pond, East Pond, and wetlands east of Fanno Creek located above the top of slope adjacent to Fanno Creek. The proposed roadway alignment also impacts 0.56 acres of CWS vegetated corridor. A vegetated corridor mitigation plan has been approved by CWS as part of the SPL issued for the project, and a revised SPL will determine any additional vegetation planting requirements. Given the significant amount of area to be retained as natural space, it is anticipated that all CWS buffer requirements can be accommodated. This application includes a Comprehensive Plan Map Amendment to remove the Goal 5 "safe harbor" designation from the impacted wetlands. Provided that the re-designation of the land proposed for development is approved, this standard should no longer preclude development of the roadway within the wetlands.It is important to reiterate that while some ' wetland impacts will occur, they have been mitigated through the creation/restoration of wetland areas on the site at a ratio greater than 1 to 1. 2. The extent and nature of the proposed land form alteration or development will not create site disturbances to an extent greater than the minimum required for the use; Response: As part of the initial 2002-2005 planning effort, an Alternatives Analysis was prepared for the wetland permit application in order to minimize proposed impacts to ' Pinebrook Creek and associated wetlands. The proposed stream and wetland impacts have been reduced to the minimum necessary in order to construct the project, and proposed impacts were previously approved by the DSL and the Corps.The Alternatives Analysis is ' included as Exhibit 1.As demonstrated on the plans originally submitted,a berm within the existing wetland area will be removed to ensure proper bridge clearance. Other alterations include removal of the two man-made ponds to increase water quality and reduce thermal pollution. No land form alterations are proposed except those which are directly necessary for construction of the roadway and associated bridge,including approximately.19 acres of wetland impacts for Phase 2. In summary,there are no impacts unrelated to construction of the facilities already approved in the original Corps/DSL 404 permit. As previously discussed, a net reduction of material within the floodplain will increase flood storage capacity, and the proposed bridge is not anticipated to increase the base flood elevation. Proposed impacts have been minimized by shifting the roadway alignment north to minimize ' impacts to the East Pond and narrowing the roadway by eliminating the planter strip where the roadway is in close proximity to wetlands and vegetated corridors.Furthermore,the use of a 320 ft. bridge space (rather than a 160 ft. span) will limit the fill required to cross the ' wetland. The primary wetland impacts of this bridge will be the pilings uses for supports. This criterion is satisfied. 3. Any encroachment or change in on-site or off-site drainage which would adversely impact wetland characteristics have been mitigated; Response: The design of the reconfigured Pinebrook Creek stream channel will maintain ' wetland hydrology on and adjacent to the site.In addition,treated stormwater from the water quality facility will be directed into the wetland mitigation area to ensure that wetland hydrology on the site is maintained,and that development does not adversely impact water quality. According to the 2005 Alternatives Analysis, H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc ' City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 16 ' Mitigation of impacts to this function will include the use of sediment and contaminant control BMPs during construction, and construction of water quality facilities to treat roadway runoff. Treated runoff will be directed to wetland or floodplain areas on the ' site instead of directly to a stream, increasing the potential for these areas to provide the sediment, temperature and water pollution control function. ' This criterion is thereby satisfied. 4. Where natural vegetation has been removed due to land form alteration or development, erosion control provisions of the Surface Water Management program of Washington County must be met and areas not covered by structures or impervious surfaces will be replanted in like or similar species in accordance with Chapter ' 18.745, Landscaping and Screening; Response:Erosion control provisions of Washington County's Surface Water Management program will be met. All disturbed areas will be seeded and planted upon completion of construction. The 50 ft.vegetated corridors adjacent to Pinebrook Creek,Fanno Creek,and ' wetlands will be planted to meet CWS Design and Construction Standards,effective March 1, 2004. A new CWS SPL is in process which may impose updated mitigation standards. Additionally,a replanting plan for both Phases 1 and 2 was completed,in conjunction with the original SPL,included as Exhibit 6.Mitigation for Phase 2 includes replanting of 22,305 SF with at least 727 trees and 1,358 shrubs for replacement,and replanting of at least 6,025 SF for enhancement. According to the Compensatory Wetland Mitigation Plan(November ' 2005), constructed mitigation received a 1:1 ratio for wetland restoration. Plantings are described as follows: Mitigation site planting will incorporate a mixture of emergent and forested/scrub- shrub planting areas. Shrubs will be planted along the top of stream bank of the reconfigured Pinebrook Creek.Stream-associated wetland terraces will be seeded with the wetland planting mix, and sedges and rushes will be planted in the central depression areas. The reconfigured West and East Ponds and the wetland respiration/berm removal area will be seeded and planted with native tress and shrubs to create forested/scrub-shrub wetlands. ' To summarize,CWS standards require a higher density of plant material to be replaced than existed prior to work, and all affected area not covered by roadway improvements will be ' replanted in this way. While the original replanting plan was determined to be in conformance with City and CWS standards in affect at the time,any additional requirements imposed by CWS will be met through a revised planting plan. The proposal can therefore conform to this standard. 5. All other sensitive lands requirements of this chapter have been met; Response: The applicable requirements of this chapter are addressed in this narrative. In each case,demonstrable conformance with all criteria was provided,or evidence sufficient to show that compliance with said criteria can be achieved was presented. The proposal is therefore consistent with this criterion. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc 1 1 ' City of Tigard Completeness Response Project Number 2070334.02 ' February 5, 2009 Page 17 ' 6. The necessary U.S. Army Corps of Engineers and State of Oregon Land Board, Division of State Lands, and CWS approvals shall be obtained; Response: Wetland permits have been received from the US Army Corps of Engineers (Corps #200300137) and the Oregon Department of State Lands (DSL #31719-RF). A ' Service Provider Letter has been obtained from Clean Water Services(CWS File No.4203) and a revised CWS SPL has been applied for. In summary, a complete set of permits from jurisdictions governing impacts to wetlands was compiled at the time of the previous ' Sensitive Lands application. These permits have since expired, and new Corps and DSL permits will be obtained prior to development. A revised CWS permit is currently under review. The proposal thereby satisfies this criterion. 7. The provisions of Chapter 18.790, Tree Removal, shall be met; Response:Tree removal in conjunction with bridge construction is not currently proposed. ' An arborist was commissioned to evaluate the trees in the area of the project and recommended that fourteen trees be removed. This letter and an accompanying table describing the condition of trees being considered for removal are attached to this report as Exhibit 8.Once detailed construction plans are created,affected trees will be determined and aTree Removal permit will be obtained.No tree removal inconsistent with the provisions of Chapter 18.790 will be conducted,nor will it be conducted without prior City approval.This criterion can be satisfied. ' 8. Physical Limitations and Natural Hazards,Flood plains and Wetlands,Natural Areas, Y P and Parks,Recreation and Open Space policies of the Comprehensive Plan have been ' satisfied. Response: Goals and policies related to natural hazards and floodplains and wetlands were addressed above.Comprehensive plan policies related to Parks,Recreation,and Open Space are discussed below. Please note that these policies do not apply as the proposal neither creates nor impinges on the creation of parks and open spaces. This application is purely to provide essential public infrastructure to serve a"landlocked"parcel. ' Parks,Recreation, and,Open Space ' Goal: 8.1. Provide a wide variety of high quality park and open spaces for all residents, including both: A. developed areas with facilities for active recreation; and ' B. undeveloped areas for nature-oriented recreation and the protection and enhancement of valuable natural resources within the parks and open space system. 1. Tigard shall acquire, develop, and maintain a diverse system of parks, trails, open space, and recreational facilities that are safe;functional, and accessible to all of its population. Response: This project is to construct a public roadway and does not significantly affect parkland,trails, or open space in the City. This policy does not apply. • H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I • ' City of Tigard Completeness Response Project Number 2070334.02 ' February 5, 2009 Page 18 ' 2. The City shall preserve and, where appropriate, acquire and improve natural areas located within a half mile of every Tigard resident to provide passive recreational opportunities. Response:The proposed bridge will be constructed within a transportation easement granted tto Fred Fields, which cannot be reserved as public park land. As a result, the proposed facility will have no significant affect on the amount of parkland or public open space available to Tigard residents. ' 3. The City shall seek to achieve or exceed the ideal park service level standard of 11.0 acres of parkland per thousand population. ' Response:The proposal does not include additional formal parkland.Therefore,this policy does not apply. 4. The City shall endeavor to develop neighborhood parks [or neighborhood park facilities within other parks,such as a linear park]located within a half mile of every resident to provide access to active and passive recreation opportunities for residents ' of all ages. Response:The proposal does not include additional formal parkland,nor does it reduce the ability for the City to provide parkland. Therefore,this policy does not apply. 5. The City shall develop other parks, including linear parks,special use facilities, urban plazas, skate parks, and pet areas, consistent with the descriptions and standards contained in the park system master plan. Response:The proposal does not include additional formal parkland.Therefore,this policy does not apply. 6. The City shall acquire and manage some open spaces to solely provide protection of natural resources and other open spaces to additionally provide nature-oriented outdoor recreation and trail-related activities. Response:The proposed bridge will be constructed within a transportation easement granted to Fred Fields, which cannot be reserved as public park land. As a result, the proposed facility will have no significant affect on the amount of parkland or public open space available to Tigard residents. 7. The City shall ensure public safety is a consideration in the planning, design, and ' management of parks, open spaces, and trails. Response: This policy is for the City to implement,and is not applicable to the proposal at issue in this application. Future public use trails will be subject to this policy. 8. The City shall enforce park rules to protect public safety. Response: This policy is for the City to implement and is not applicable. 9. The City shall integrate green concepts into park and open space design, maintenance, and operations. Response: This policy is for the City to implement and is not applicable. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I 1 City of Tigard Completeness Response Project Number 2070334.02 ' February 5, 2009 Page 19 ' 10. In addition to standing committees such as the Park and Recreation Advisory Board, and the Tree Board, the City shall continue to involve its residents and businesses as active participants and partners in all aspects of providing park and recreational services. Response: This policy is for the City to implement and is not applicable. 11. The City shall ensure that the community at large is adequately informed of recreation opportunities and programs; issues affecting park, open space, and recreation services; and volunteer opportunities. Response: This policy is for the City to implement and is not applicable. 12. The City shall, either directly or in coordination with other stakeholders and agencies, seek opportunities to acquire public open space. Response: This policy is for the City to implement and is not applicable. 13. The City shall build and maintain partnerships with other governmental and private ' agencies and organizations to optimize funding and facility resources, and improve park and recreational opportunities. Response: This policy is for the City to implement and is not applicable. 1 14. When considering acquisition of new parkland and open space, the City shall identify funding for required maintenance and public safety activities. Response: This policy is for the City to implement and is not applicable. ' 15. The City shall require all development to pay a parks system development charge or to dedicate land in lieu of a park system development charge. ' Response:As the proposed street extension is identified on the City's TSP,it is not subject to parks SDCs.However,any future development proposed by the applicant will be subject to such fees. 111 16. The City shall continue to encourage and recognize the important role of volunteers and community groups in meeting City park, trail, open space, and recreation needs, and in building stewardship and promoting community pride. Response: This policy is for the City to implement and is not applicable. 17. The City shall maintain and manage its parks and open space resources in ways that preserve,protect, and restore Tigard's natural resources, including rare, or state and federally listed species, and provide "Nature in the City"opportunities. Response: This policy is for the City to implement and is not applicable. 18. The City shall provide funding for a high level of park, open space, and recreational facility maintenance. Response: This policy is for the City to implement and is not applicable. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I ' City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 20 19. The City shall seek to establish and manage a fully functional urban forest. Response:Although the extension of Wall Street will involve the selective removal of trees (as described in the 2004 and 2008 Revised Tree and Landscaped Assessment),the removal ' of those trees was not determined to be detrimental to Tigard's urban forest, and is the minimum necessary for development.The most recent assessment recommends that fourteen trees be removed as part of Phase 2.This assessment also provides direct recommendations to aid in protection and maintenance of existing trees,which will be observed.The proposal ' is therefore consistent with this policy. 20. The City shall continue to improve access to neighborhood parks and other facilities in order to serve all citizens, regardless of ability. Response: This policy is for the City to implement and is not applicable. ' 21. Acceptance of any land donated for park purposes shall be based upon its usefulness and adaptability to the Park System Master Plan. Response: This policy is for the City to implement and is not applicable. ' 22. City-owned property may be used for private wetlands mitigation considered on a case-by-case basis. Response: This policy is for the City to implement and is not applicable. Summary Responses to all sensitive lands criteria have been provided above. In summary, each have been met by the proposed design except where prohibitions exist on working within wetland/floodplain.These restrictions are proposed to be relaxed through a Comprehensive Plan Amendment to remove Goal 5 Safe Harbor protection. Tree Removal. The narrative states that trees must be removed for the construction of Wall ' Street, but tree removal permit applications were not submitted with this application. Trees within sensitive lands, including Significant Habitat Area, require a permit for removal. Response: Trees required for removal are detailed in the Revised Tree and Landscape Assessment(Attachment 9).We are requesting the removal of the previous tree plan review, as it is not applicable under Section 18.79O.O3O.A. As such, a subsequent application for a tree removal permit will be requested based upon the proposed design and information ' provided in the attached arborist report. Streets and Utility Standards.Please re-address Chapter 18.810,sections 030, 040,and 070 I with information regarding the proposed design of Wall Street. Response: All applicable standards are listed below; however, as the project is not a proposal for development other than the extension of a roadway, standards related to ' subdivision/partitions are not included below. Responses to all standards relating to construction guidelines,street sections,alignment,grade,and sidewalks are addressed below. Note that block standards are not applicable to this proposal because no new blocks are being created.Further,this facility is on the City's own Transportation System Plan and is implied to be consistent with block and alignment standards. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc 1 • I City of Tigard Completeness Response. Project Number 2070334.02 February 5, 2009 Page 21 ' .030 Streets A. Improvements Response: This subsection sets forth requirements that no development occur unless ' adequate street systems are in place to serve that development. More specifically, requirements for half-street improvements and new streets are addressed generally. The proposed bridge will be constructed to City standards and any future development utilizing Wall Street will be subject to the requirements of this subsection.However,as it applies most typically to land development(not infrastructure extension),this subsection does not apply to a street extension included on the City's TSP, as is proposed here. B. Creation of rights-of-way for streets and related purposes: Response:Currently,the property over which the bridge is intended to cross is owned by the City; however, the easement benefiting Fred Fields is written to run with the land. For practical purposes,there is no reason for the land to be dedicated as it is already owned by the City.Mr.Fields legal right to cross the subject property will not diminish if the easement is replaced with public right-of-way. To summarize, there is no practical benefit of dedication because the street will cross public land in either case; however, the City may choose to do so after the street is built. The requirements and standards related to private dedication of land to the public right-of-way are consequently not applicable to this proposal. C. Creation of access easements: Response: No new access easements are proposed. These standards do not apply. D. Street location, width and grade: Response: The location of the proposed street has been determined by the City's Transportation System Plan,which a specific layout is shown in the attached public facilities plans. The bridge will be 50 ft. in width,with two 12 ft. wide travel lanes,two 6 ft.bicycle lanes,and 2 ft. sidewalks.Beginning at an elevation of 145 ft. and ending at an elevation of 144 ft.,the bridge has a grade of 0.3%. The location,width,and grade of the proposed road are all shown on plans submitted to the City.In summary,the proposal provides safe access to the subject site and is understood to be consistent with City standards. Once final design ' documents are created,they will be further reviewed by the City Engineer.These standards can be met. ' E. Minimum rights-of-way and street widths: Response:Wall Street,including the proposed extension,is designated as a collector street. The proposed bridge section will not have landscaped areas (which are not required for bridges), but is otherwise consistent with the TSP as follows: H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc City of Tigard Completeness Response Project Number 2070334.02 February 5, 2009 Page 22 Required Widths Proposed (Table 18.810.1) Widths Travel Lanes _ 11' 12' Bike Lanes 6' 6' ' Sidewalks 6' 6' The existing right-of-way is 72 ft. wide and features street width of 48 ft. (two 11 ft. travel lanes, 14 ft. median/turn lane, and two 6 ft. bike lanes). The bridge will not technically be located within right-of-way, but the existing easement is sufficient to accommodate the proposed bridge cross section. ' Note that the plans for the proposed bridge were reviewed and tentatively approved by the City. As the proposed bridge meets applicable street design requirements,the standards of this subsection have been met. F. Future street plan and extension of streets: Response:Future street plans are required for subdivisions and partitions in order to ensure adequate circulation and street extensions into abutting streets. As this project does not involve a land division,this subsection does not apply.Even so,requirements for barricades or a turnaround at the end of the proposed extension will be observed if required. G. Street spacing and access management: Response: Chapter 18.705.030 sets forth standards addressing how properties access ' roadways in conjunction with new development.As the proposal is for a street extension and not abutting development, these standards are not applicable at this time. They will, however, apply to and land development accessing the proposed street extension. ' H. Street alignment and connections: Response:Connections every 530 ft.are required unless precluded by topography,railroads, ' freeways, pre-existing developments, lease provisions, easements, covenants, or other restrictions.This proposal is for the extension of a single street not in conjunction with land development; therefore, a full street network complete with intersections is not proposed. The spacing standard is not applicable. The proposal is consistent with Subsection H.2, ' which requires that collector streets be extended into abutting properties where possible.In this case, the proposal will allow a street connection to Fred Fields' property. I. Intersection angles: Response: The intersection of Hall Blvd. and Wall Street has already been established.No new intersections are proposed at this time. This subsection does not apply. ' .1. Existing rights-of-way: Response:The proposal is for a roadway to be constructed within a private access easement ' that crosses public property. No additional right-of-way is necessary to construct the extension to its designated standard. The City may decide to dedicate the portion of land underneath the access easement or negotiate with Mr.Fields to abolish the easement in lieu ' of right-of-way creation if it is desired that the proposed extension exist within designated right-of-way rather than simply public property. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc • I City of Tigard Completeness Response Project Number 2070334.02 ' February 5, 2009 Page 23 ' K. Partial street improvements: Response: No partial street improvements are proposed with this project. 1 L. Cul-de-sacs: Response:No cul-de-sac will be provided.Tualatin Valley Fire and Rescue has previously determined that turnaround opportunities in both the Fanno Pointe development and the Library parking lot are acceptable. Therefore, it is assumed that future development of the subject site will provide required turnaround opportunities without the need for a cul-de-sac, but will be determined during Site Design Review for a specific project. ' M. Street names: Response: This road extension is named Wall Street as selected by the City of Tigard. N. Grades and curves: Response: The road extension is designed to not exceed a grade of 12%, according to the standards of this section. 0. Curbs, curb cuts, ramps, and driveway approaches: Response: Concrete curbs will be provided as is shown on the attached cross section. ' P. Streets adjacent to railroad right-of-way: Response: This road extension is not adjacent to a railroad right-of-way. l Q. Access to arterials and collectors: Response: While Wall Street is designated as a collector on the City's TSP,this street will be limited to serving only future development on the subject site along with the existing Tigard Library and the Fanno Pointe Condominiums. Direct access to this street will be determined at the time of development,although the classification of Wall Street should not necessitate a frontage road as described in subsection Q.1. Any lots or development with ' direct frontage on to Wall Street can be developed so as to minimize any disturbances to future occupants caused by the street. ' R. Alleys,public or private: Response: No alleys are proposed. S. Survey monuments: ' Response: The requirements of this section will be met at the time of development of the extension. T. Private streets: Response: If the proposed extension is maintained as a private street, a maintenance agreement will be recorded in a manner consistent with City standards. U. Railroad crossings: Response: No railroad crossings are proposed. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc I City of Tigard Completeness Response Project Number 2070334.02 ' February 5, 2009. Page 24 ' V. Street signs: Response: Street signs will be installed in compliance with these standards. W. Mailboxes: ' Response:Mailboxes serving future land development will comply with the standards of this section. ' X. Traffic signals: Response:A traffic signal was constructed at the Hall Blvd./Wall Street intersection during Phase 1 in accordance with ODOT standards. No additional signal improvements are ' proposed or required. Y. Street light standards: ' Response: Street lights will be installed in compliance with these standards. Z. Street name signs: Response: Additional street name signs, if required, will be installed in compliance with these standards. ' AA. Street cross-sections: Response: The cross sections required by the subsection generally do not apply to bridges; however,the approach ramps will be consistent with City street cross section standards.The standards of this subsection can be met. ' AB. Traffic calming: Response: Traffic calming devices are not proposed. ' AC. Traffic study: Response: A traffic study is not necessary for the proposed extension as no specific ' development is proposed. .040 Blocks: • Response:These standards are not applicable to the proposed project because no new street intersections are proposed. .050 Easements: Response: Easements for utilities and access will be provided as necessary. .060 Lots: ' Response:The proposed road bisects two lots.Dedication of right-of-way will be completed in the event that the proposed extension is desired as a public right-of-way. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc 1 r . • ' City of Tigard Completeness Response Project Number 2070334.02 ' February 5, 2009 Page 25 ' .070 Sidewalks: Response: 6 ft. wide sidewalks are proposed on both sides of the road extension. No landscaping is proposed with the extension because most of it is a bridge crossing. The responses to the standards above have been provided to respond to all completeness items identified by City staff.While we trust that they provide sufficient information for staff to process and ultimately approve the proposal,no additional information will be provided ' until the application is deemed complete for processing. This declaration exercises the applicant's rights under ORS 227.178(4)(a) and(b). ' EXTENSION PLANS A general comment regarding the level of detail and clarity of plans previously submitted is also intended to be addressed with this submittal.Attached(Exhibit 12)to this submittal you will find additional large and small formatted drawings which have been altered to provide the greatest level of understanding regarding the proposed extension.A brief description of ' each drawing as it applies to this application is provided below: Drawing#: 22 of 13 Description:Existing conditions.This shows pre-development conditions within the impact area.Please note that this plan does not represent Phase 1 existing conditions as development and mitigation have already occurred. ' Drawing#: 32 of 13 Description: Overall site plan showing project areas and the extent of Phase 1 and Phase 2 work. Drawing#: 42 of 13 Description: Site plan showing wetland impact areas for both phases.4 ' Drawing#: 31 of 34 Description: Street/utility improvement plan showing wetland mitigation areas. Drawing #: 32 of 34 Description: Street/utility improvement plan showing upland buffer seeding. Drawing#: 33 of 34 Description: Street/utility improvement plan showing upland buffer planting. ' Drawing#: 62 of 13 Description:,Phase 2 extension profile. Drawing#: 66 of 13 Description: Street profile. H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc ' I City of Tigard Completeness Response Project Number 2070334.02 February 5,2009 Page 26 Drawing #: 9 of 13 Description: Street profile at the western extent of the bridge. Drawing#: 7 of 13 ' Description: Bridge plan and elevation. • Drawing#: 8 of 13 Description: Typical bridge deck section. Thank you for your in-depth response to our initial application.We look forward to further ' pursuing this request. Please let us know if you have any questions or comments. Sincerely, I - , • I Rhys Konrad, Planner, LEED AP Associate Exhibits: ' 1. Alternatives Analysis 2. Joint Permit Application • 3. Geotechnical Report ' 4. Stormwater Report 5. Hydraulic Analysis 6. CWS Service Provider Letter 7. 2004 Arborist Report 8. 2008 Arborist Report 9. 2005 Memo from DeHaas &Associates ' 10. 2005 Memo from Metro 11. 2008 ESEE Analysis 12. Color Highlighted,Drawings • 1 i H:\PROJECTS\207033402\WP\090205-Completeness Response_CPS.doc 1 ' E}041Bir 7 � ALTERNATiVES ANALY� I5 r I CITY OF TIGARD WALL STREET ALTERNATIVES ANALYSIS ! The alternatives analysis that was initially prepared for the Wall Street project included a discussion of both Phase 1 and Phase 2 of the project. This approach was required by several of Ithe natural resource.regulatory agencies reviewing the project, including.the Oregon Department i, of State Lands, U.S.,Army Corps•of Engineers, and Clean Water Services. The alternatives 1 I analysis and discussion of alternative roadway alignments that follows below therefore includes information regarding both Phases 1 and 2 of the project, although the City is only proposing to construct Phase 1 at this time. I . The purpose and need of Phase 1 of the Wall Street project is to provide access to the Tigard , , Library and to the Fanno Point Condominiums that is not directly off Hall Boulevard to satisfy,; I ODOT spacing requirements and improve road safety. Hall Boulevard is an ODOT facility,-and ODOT permitted the library and Fanno Pointe to construct temporary entrances off of Hall , Boulevard, with a requirement:to remove the temporary-accesses,from Hall Boulevard at.such . Itime that permanent access from Wall Street became available. The Phase 2 purpose and needs information pertaining to the Tigard Transportation System Plan and the need to provide access to industrial lands is no longer applicable since this Comprehensive.Plan Amendment submittal pertains only to Phase 1 of the project; therefore,.this information has been removed from the revised alternatives analysis. I Several of the alternatives described below are no longer practicable due to the construction of the Tigard Library, and the Fanno Pointe Condominiums. The reason for the inclusion of.these alternative.alignments.in the alternative analysis is as follows. The City evaluated Alternatives•1, 1 through 4 in 2002, prior to permitting of the Tigard library and prior to the sale of the Fanno Pointe property and initiation of site development. Although.Alternatives 1, 3. and 4 are.no. longer possibledue.to recent developments; they;were,included;in°the_alternatives analysis.since I the Corps of Engineers stated that they wanted:to see ,evidence- that the City had .evaluated alternative alignments to the presently proposed Wall'Street alignment that would have been possible prior to construction of the, new library, as well as documentation of the reasons why Uthese other alternatives would not have been possible. Alternatives 5 through 9 were,developed • more recently in conjunction with preparation of the wetland permit application in order to evaluate options,that are potentially feasible given the fact that the Wary-and Fanno.Pointe. ICondominiums have been.developed. The goal of Alternatives 5 through 9 was to evaluate alternatives to avoid or minimize impacts to wetlands-and other natural resources. As a result of this alternatives.analysis'process, we identified and recommended to the City-of Tigard a new Ialternative,(Alternative 9) that we determined would avoid and minimize impacts to the greatest extent. practicable. The City accepted Alternative 9, and that has become the Proposed Alternative. The following sections,present and discuss: road alignment alternatives considered. Ifor.the Wall Street extension; the implications of a no-build,altemative; ecological setting and functions; and ecological impacts of project alternatives. IThe extension of Milton Court has been suggested by the City as an additional alternative.,to provide access to the industrial lands ,located west_of the railroad tracks that should be investigated. This alternative is outside the scope of the current Phase 1 .Comprehensive Plan j IAmendment submittal but may be evaluated in the future at such time as the City decides to proceed with.providing:this access. . Wall Street Alternatives Analysis,revised March 2005 Page 1 of 21 1 1 • 1 The 425 ft length is necessary to serve the library and condominiums while providing adequate length for the westbound left-turn lane at the intersection with SW Hall Boulevard, the accompanying left-turn lane transition, and the eastbound left-turn lane at the library access. This distance is further explained in the Kittelson memo of 2/21/05 included as Attachment . ' WALL STREET EXTENSION ALIGNMENT ALTERNATIVES(Phase 1 &2) Factors taken into consideration during alternative design and selection of the Proposed Project for the Wall Street project included: the width of the Fanno Creek floodplain and floodway, location of channel meanders in Fanno Creek, bridge construction costs, quantity and quality of wetlands associated with Fanno Creek and Pinebrook Creek, ODOT spacing requirements on Hall Boulevard; minimum radius curves to operate safely at 35 miles per hour, ODOT requirements for crossing the railroad tracks (crossings are required to be less than 5 degrees from perpendicular), the goal of preventing additional traffic congestion on Hall Boulevard by ' requiring the Tigard Library and Fanno Pointe development to access onto an interior street (Wall Street), and the goal of providing access to 26 acres of industrially zoned land located between Fanno Creek and the railroad tracks. Impacts associated with each of the alternatives are 1 summarized in Table 1 at the end of this section. Environmental impacts associated with the alternatives are also discussed at the end of this section. The City evaluated nine alternative roadway alignments and five alternative bridge lengths for g � the proposed Wall Street extension with the goals,of=improving traffic circulation and providing access to the Tigard Library and the Fanno Pointe development while minimizing impacts to ) 1i Fanno Creek, Pinebrook Creek, and associated wetlands and-ponds. The alternatives'considered included shifting the roadway alignment either north or south of the Preferred Alternative.as well as evaluating the effect of different bridge lengths on the 100-year floodplain and floodway elevations of Fanno Creek. All nine roadway alignments include a generally common segment from the railroad tracks to Hunziker Street but differ in alignment from Hall Boulevard to the railroad tracks. Four alternative alignments for the Wall Street extension -(Alternatives 1 through 4) were evaluated by the City early in 2002,prior to permitting of the Tigard Library and prior to the sale of the Fanno Pointe property and subsequent initiation of site development. At that time, the City determined that Alternative 2 was the Preferred Alternative for the Wall Street extension, and site development planning, permitting and construction for the Tigard library was initiated using this location for the future Wall Street project. Alternatives 5 through 9 were recently developed with the goal of evaluating the possibilities for minimizing impacts to natural resources given the fact that current site development on both the Tigard Library site and the Fanno Pointe site means that Alternatives 1, 3 and 4 are no longer possible. The Preferred Alternative has been replaced with Alternative 9, which is referred to as the Proposed Project. Alternatives 1 — 9 are shown in Figure A-8. A description of each alternative, the associated environmental impacts, and engineering considerations for each alternative, and the rationale for selection of Alternative 9 as the Proposed Project follows below. Wetland delineations have not been conducted along the entire alignment (Phases 1 &2) of each of the alternatives. Approximate wetland boundaries were determined in order to estimate , Wall Street Alternatives Analysis,revised March 2005 Page 2 of 21 I I . wetland impacts in areas that have not been delineated.that would result from each of the alternative alignments for Phases .1 and 2 of the project. Approximate wetland boundaries were • ll determined based upon the City's Local Wetland Inventory, aerial photos, and field observations of site vegetation, topography and hydrology indictors: Approximate .wetland:impacts for each' . alternative were calculated assuming that in.each alternative the floodway would be spanned by a bridge;' therefore wetland.areas located inside the foodway were not included in the wetland I impact area for each alternative. Similarly, approximate floodplain impacts for each alternative were calculated assuming that in each alternative the:floodway would be spanned by abridge; - Itherefore the floodway area,included inside the boundary of the:floodplain was subtracted from the total floodplain area to.detei7nine the approximate floodplain impact area for each alternative. Wetland and floodplain impacts for each alternative are summarized in Table 1 at the end of this . section. . Alternative 1: Connect Wall Street to Hall Boulevard at O'Mara Street, _ • , - . I This alternative connects to Hall Boulevard at O'Mara Street and would need to be curved northerly sufficient to avoid having to bridge three sections of Fanno Creek due to channel meanders. This alternative would Also require reverse curves, the,last of which extends to the I railroad crossing right-of-way, creating an objectionable curved approach to the railroad signals.- Due to the constraints posed by needing to connect.with O'Mara Street, cross Fanno-Creek.north of the channel meanders, and cross,the railroad at less than,5-degrees from perpendicular, it was - ' Inot-possible-;to design this alignment geometrically correctly. ;a: <:. .• This alternative would.have likely,created a situation whereby traffic.could increase along ,i-,,,. IO'Mara..,The surrounding neighborhood voiced strong public opposition to aligning Wall Street.. directly across from O'Mara,Street.due to concerns about the:potential for an increase.in cut- through traffic:on a,local.,neighborhood street. Although this public opposition was taken.into'. ;w 1 consideration during the ,alternatives -analysis, it -was, not the, reason this alternative, was,not. selected.-This alignment would also have severely;impacted the potential to-develop the,Tigard Library site due to the.location.of the roadway midway between"the_south,property boundary and IFanno Creek to the north. In addition, crossing Fanno Creek in this location, which is in-close proximity to channel meanders, would potentially have increased the length of stream habitat affected by noise and,other,.disturbance due,to the.roadway and bridge..lThis alternative had less '. Iwetland, impacts than •the. Preferred .Alternative and would not have resulted in any wetland impacts west of Fanno,Creek, but would have impacted wetlands east of Fanno.Creek'(the area east.of Fanno Creek_has not been delineated but wetlands areas were observed in this area in the I. field). This ,alternative .had approximately the same ,floodplain impact as the Preferred Alternative. This alignment would have -required land acquisition of right-of-may from the ITigard-Tualatin School District. , • . • , , • Althou gh this s alternative•had less wetland impacts than the Preferred Alternative, it was not selected due to its not being geometrically acceptable. • . . . - . Alternative 2a (PreviouslyYreferred.Alternative):,Connect Wall Street to Hall Boulevard.at the south side of tax lot 200 (south side of the Tigard Library site):. . ' • • ' All project alternatives have abridge that spans the floodway.The bridge design incorporates 80`foot sections - . I supported by piles. Bridge supports will not be located in the stream or in wetlands. • Wall Street Attematives Analysis,revised March 2005 Page 3 of 21 . 1 I This alignment includes the 20-foot wide access easement immediately south of this tax lot. This alternative would be constructed in two phases: Phase 1 consists of construction of the western 425 feet of Wall Street, beginning at Hall Boulevard and ending just west of the East Pond. Phase 2 includes construction of a 320 foot bridge over Fanno Creek and the floodway and construction of the remainder of Wall Street to connect with Hunziker Street. The purpose of Phase 1 of the project is to provide access to the Tigard Library and the Fanno Pointe development. Although these developments are currently being built with accesses off of Hall Boulevard, due to.high traffic volumes on Hall Boulevard and ODOT spacing requirements and safety concerns, ODOT permitted the new library and. Fanno Pointe to construct temporary I entrances off of Hall Boulevard with the understanding that these accesses would be removed and replaced with permanent accesses off of Wall Street at the time that the first 425 feet of Wall Street was constructed. I The alignment of Alternative 2 locates the intersection approximately 350 feet south of the Hall/O'Mara intersection, and has been approved by ODOT. The location of the Hall/Wall I intersection minimizes the likelihood of increasing traffic on O'Mara and allows site development to occur as envisioned in the model prepared for the Tigard Library. This alignment requires impacts to Pinebrook Creek and associated emergent/scrub-shrub wetlands and man- 1 made ponds and minor impacts to wetlands located east of Fanno Creek. This alignment would require culverting Pinebrook Creek under Wall Street and constructing a new stream channel on the north side of the roadway. Proposed stream and wetland impacts include 0.20 acre for Phase 1 and 0.28 acre for Phase 2 for a total of 0.48 acre. Floodplain impacts for this alternative are 0.08 acre for Phase 1 and 0.57 acre for Phase 2 for a total`of"0.65 acre. This'section of Pinebrook Creek proposed to be impacted has been extensively modified from its historic condition and has 1p f a high occurrence of invasive plant species. The need to relocate and reconstruct the Pinebrook Creek stream channel provides an opportunity to restore the,stream to-a lmore.natural.condition - as well as potentially restoring fish passage from Fanno Creek to Pinebrook Creek. Construction of the relocated Pinebrook Creek on the north side of Wall Street would prevent future expansion of the parking lot for the Tigard Library. The number of parking spaces is currently at the minimum required. , A variation to this alternative was to move the street 70 to 80 feet 'south of the 20-foot wide access easement. This variation would have required acquisition of a right-of-way from the lot adjacent to the library site, but would have allowed for better use of the library site for site development.and parking. This_variation would have"avoided'Pinebrook Creek-and associated wetlands but would have involved impacting approximately the same amount of wetland area 'I and impacts would have been to higher quality scrub-shrub and forested wetlands located east and west of Fanno Creek in the floodplain. Alternative 2b: Construct only Phase 1 of the Wall Street extension in order to minimize 11 impacts to Pinebrook Creek and associated wetlands. This alternative involves constructing only as much of Wall Street as is required to access the Tigard Library and the Fanno Pointe development. These accesses are proposed to occur ,; approximately 400 feet east of the intersection of Wall Street with Hall Boulevard. The minimum roadway length for Phase 1 was determined by a traffic study conducted by DKS Associates in 2002. A 250 foot long westbound left-turn lane was determined to be necessary for U Wall Street Alternatives Analysis,revised March 2005 Page 4 of 21 I the Wall/Hall intersection in-the year 2017. In addition, the traffic study recommended providing a 100 foot long eastbound left-turn lane into the library. The proposed library access cannot be I shifted closer to Hall Boulevard without resulting in a conflict between the storage length needed for these two left turn lanes. Therefore, the length of Phase 1 cannot be reduced to less than 425 feet. • I At this point in time,the City is proceeding with engineering studies and.permitting for the entire Street project. If. it were determined.that Phase 2 could not be constructed due to I engineering, environmental or cost issues, the City would continue to pursue permitting for construction of Phase 1. • I Alternatives 3 and 4: Connect Wall Street to Hall Boulevard at the south side of tax lot 300 (south side of the Fanno Pointe site). These alignments were ideal from the standpoint of intersection spacing because.they'placed I Wall Street approximately 650 feet from O'Mara Street to the north and the same distance from McDonald'Street to the south. Alternatives 3 and 4 are two slightly different variations of the same basic alignment. Alternative 3 begins the curve in the street toward the railroad tracks Iearlier than Alternative 4 and leaves less of the parcel for development. Alternative 4 begins the curve towards the railroad tracks to the east of Alternative 3 and leaves slightly more land- _ available for development north of the road. - . . These alignments crossed long sections of floodplain and wetlands. The requirement to span.:the ' floodway:l-would have required lengthening the bridge from the currently proposed 320 foot . 'c i ./ length to approximately 480 feet (Alternative 3) or 580 feet (Alternative 4), which would have :ki been•cosh=prohibitive for the project. These alignments would have required land acquisilion . - ' ' from the adjacent.property-owner-to accommodate the street construction. In addition, unless he:. ',v. iCity purchased the entire parcel, development would most likely have occurred:on•the remaining. north portion of the site and adjacent to the Tigard Library. There was a concern about whether: - this future development would be compatible with the;library. These alignments.would.have 1 involved similar.wetland impacts ,as the Preferred Alternative=.but Alternative 3 :would have resulted in greater-floodplain impacts. Although these alternatives would have-avoided impacts to Pinebrook Creek and associated wetlands, the scrub-shrub and forested.wetlands located east 1 and west of Fanno Creek which would have been impacted are of higher quality than the emergent/scrub-shrub and invasive species dominated wetlands associated with Pinebrook Creek ' These alternatives were not 'selected due to the greater wetland and floodplain impacts of ' Alternative 3, impacts to higher quality wetlands, greater floodway distance, higher bridge construction expense, and right-of-way purchasing limitations. . . . ' , . Alternative 5: Connect Wall Street to Hall Boulevard on tax lot 600 north of.the Tigard Library. I This alternative is a variation of Alternative 1.that avoids impacting the'-footprint of the Tigard Library located to the south as well as the footprint of the new water quality facility for the Hall Boulevard widening located'to the north. This alignment:does not meet.-ODOT'intersection I spacing requirements due to its location approximately 100 to 150 feet north'of'O'Mara Street, and it is highly unlikely that a Major Deviation Request for reduced spacing would be approved by ODOT for this alternative. An approximately 355.ft; centerline radius.curve would be I Wall Street Altematives Analysis,revised March 2005 . . • . Page 5 of 21 . 1 required to meet the railroad crossing requirement while the minimum safe radius for a 35 mile I per hour road is 455 ft. This alternative had less wetland impacts than the Preferred Alternative and would not have resulted in any wetland impacts west of Fanno Creek, but would have impacted wetlands east of Fanno Creek (the area east of Fanno Creek has not been delineated but wetlands areas were ' observed in this area in the field). Most of this alternative west of the railroad crossing is located within the floodplain, and this alternative has the second to the largest floodplain impact of all 9 alternatives examined (as stated on pages 4-5, the floodplain impact calculation assumes that the floodway is spanned by a bridge and the floodplain impact does not include the spanned I floodway). This alternative would require modifications to the design of the entrance road and parking lot of the Tigard Library and would require the Fanno Pointe development to access 1 directly off of Hall Boulevard, which is objectionable to ODOT. This alignment would require land acquisition of right-of-way from the Tigard-Tualatin School District. This alternative was not selected due to its eater floodplain gr i pan impact and failure to meet ODOT requirements. Alternative 6: Connect Wall Street to Hall Boulevard on tax lot 600 North of Fanno Creek. This alternative follows the general location of the Clean Water Services 60 inch sanitary sewer interceptor until curving easterly for the approach to the railroad crossing. An approximately 265 ft. centerline radius curve would be required to-meet-the-railroad- requirement,-while the minimum safe radius for a 35 mile per hour road is 455 ft: This alternative has greater wetland impacts than the Preferred Alternative. This alternative avoids the,nee&for,a bridge over Fanno Creek but is problematic.due-to the fact that the FEMA- floodway mapping extends north of Fanno Creek for a distance of up to 150 feet. floodway elevation. Unless a bridge were constructed to span the floodway, this alternative would involve floodway impacts that would require approval by FEMA and the local community. Moving the alignment to the north would result in impacts to the North Pond, which is in considerably better condition than the East and West Ponds. This alternative would require crossing two Fanno Creek tributaries, including Red Rock Creek. Culverts would be.required to meet current ODFW fish passage requirements. The portion of the alignment located west of the railroad tracks is 'I located, almost entirely in the floodplain, and this alternative has the greatest amount of floodplain impact of all of the alternatives. Since the roadway will be built on 6 to 8 feet of fill, this alternative would result in unacceptable floodplain impacts. This alternative would require Tigard Library and the Fanno Pointe development to access directly off of Hall Boulevard which would not be allowed by ODOT; therefore, Phase 1 of Alternative 2 would still need to-be constructed to meet the City's goal of not allowing the Tigard Library or the Fanno Pointe development to access directly off of Hall Boulevard. This alignment would require land acquisition of right-of-way from the Tigard-Tualatin School District. This alternative was not selected due to its greater wetland and floodplain impacts and potential for floodway impacts. j: Alternative 7: Connect Wall Street to Hall Boulevard immediately north of Alternative 2. cu 1 Wall Street Alternatives Analysis,revised March 2005 Page 6 of 21 111 1 i This alignment locates the intersection of Wall Street with Hall Boulevard approximately 270 t' feet south of the Hall/O'Mara intersection and does.not meet ODOT intersection spacing I requirements. It is highly unlikely that a Major Deviation Request for reduced spacing would be approved by ODOT for this alternative. This alignment would prevent future expansion of the parking lot for the Tigard. Library. The-number of parking spaces is currently at the minimum 1. required. This alignment had less wetland and floodplain impacts than the-Preferred Alternative: I Although this alternative is shifted north of Pinebrook Creek and,would avoid impacts to the l' stream.channel, it would still require impacting wetlands associated with Pinebrook Creek, 1. I including the East Pond. This alignment would require the Fanno Pointe development to construct an access road,across Pinebrook Creek and associated wetlands in order to connect to Wall Street and avoid a direct access off of Hall Boulevard to meet ODOT requirements. This alternative was not selected due to not meeting ODOT's intersection spacing requirements and,unlikelihood of obtaining a Major Deviation Request for reduced intersection spacing. Alternative 8: Reali Alternative 2 to follow the existin Clean Water Services sanitary ` lm g tary sewer alignment crossing of Fanno Creek. • - I This alternative follows the first part of the Alternative 2 alignment and then instead of curving northerly to fit the desired railroad crossing point, swings slightly southerly to follow the existing 8-inch Clean Water Services sanitary sewer crossing of Fanno Creek. Although this alignment I avoids the East Pond,it has approximately the same wetland impacts as the Preferred Alternative and.involu impacting higher quality scrub-shrub and forested wetlands.located east and west of Fanno, Creek. Using minimum ;455ft. curve radii moves. the railroad crossing 350ft.• Isouthwesterly from,the desired crossing point, increases the road length approximately 400ft,and has a.negative impact on land value because of the manner in which it bisects the large tracts•,of . industrially.zoned land.located'east and west of the railroad crossing to be served•by the Wall .• IStreet, extension. Based upon the -City's initial discussions with the property owner. of,lthe..-; industrial parcels, it is unlikely that the City would be-able to purchase the necessary cright,-of way for this alternative..Due,to the-need,for this alternatiye to impact high quality wetlands; Icombined with,the.difficulty of obtaining the necessary right-of-way, this alternative was l not :, selected., , - - • - •. . , - IAlternative 9 (Proposed Project): Connect Wall Street'to Hall Boulevard at the same location as the -Preferred'Alternative and shift the remaining'roadway northerly to minimize impacts to Pinebrook Creek. • . . This alignment is a combination of the previous Preferred-Alternative '(Alternative 2) and Alternative 7. This alternative keeps the intersection of Wall Street with Hall Boulevard at the I same location as the previous Preferred Alternative, which has been approved by ODOT, and . shifts the remaining roadway up to 70 feet north of the previous Preferred Alternative. The alignments of the previous Preferred Alternative 2 and the Proposed Project (Alternative 9) are I shown in Figure A-9. The Proposed Project has several advantages over the previous Preferred Alternative. Alternative 9 would result in 0.27 acre of wetland impacts, which is 0.21 'acre less. than the previous Preferred Alternative 2. This alternative also results in less floodplain impact, - I 0.55 acre compared with 0.65 acre for the previous Preferred Alternative 2. Proposed wetland and floodplain impacts for-Alternative 9 are shown in Figures A-10 and A-11. _ - 1 • Wall Street Aftematives Analysis,revised March 2005 Page 7 of 21 . I Street, Alternative 9 would allow Pinebrook Creek to remain on the south side of 1 !vious • eliminating the need to relocate Pinebrook Creek as would have been required with the 0 foot Preferred Alternative 2. Relocating Pinebrook Creek would have required one 91Io to 100 culvert to take Pinebrook Creek to the north side of Wall Street and possibly a secoiil eek in • foot culvert to take Pinebrook Creek back to the south in order to connect with Fanno span, the event that Pinebrook Creek could not be routed underneath the westerly c nd its Alternative 9 works better for realigning Pinebrook Creek with its historic ch e lannel confluence with Fanno Creek. The dry, historic lower section of the Pinebrook Creel Fanno was identified by Fishman Environmental Services biologists in the east portion t and as Pointe site, and is within the portion of that property that is being deeded to the Cit f o this an open space tract by the developer, Polygon NW. Reconnecting Pinebrook C e ninate f historic channel and taking the East Pond off-line from Pinebrook Creek w 'ridge overflows of warm, nutrient-rich water from the East Pond into Fanno Creek. Due t would being moved 70 feet north from the previous Preferred Alternative location, the 'd it off- more completely span the East Pond, which will be reconfigured as wetland after n just line from Pinebrook Creek. The Proposed Project will also allow for wetland res r. vation south of the East Pond where an upland berm exists (probably material sidecast fro e: etland of the East Pond and placed in historic wetlands). The result of Alternative 9 will be s impact and more on-site mitigation in the form of wetland restoration. uding Alternative 9 also has engineering benefits over the previous Preferred Alternative' : m the requiring less fill to construct the roadway due to shifting.the roadway further-north lucing higher elevation Fanno Pointe site (as compared to the elevation of the library site) er the � the length of the new Wall Street roadway by 22 feet.This alternative has an advan irking previous Preferred Alternative and Alternative 7 by allowing for future'expansion of th ?ointe lot for the Tigard Library. Alternative 9 will allow the Tigard Library, and the Fwt es by development to close their accesses to Hall Boulevard and provide alternate Ix brook connecting with the new alignment of Wall Street. Since Alternative 9 will keep F cross Creek on the south side of Wall Street, the Fanno Pointe access to Wall Street will k will Pinebrook Creek, but the need for the library's Wall Street access to cross PinebrooIC uality be eliminated. This alternative will require re-routing the outfall from the stormwate I East facility constructed for the library project. The outfall will be routed to the reconi stored Pond wetland area, which would then overflow during larger storm events thro h ing of wetlands to the south of the pond and would eventually reach Pinebrook Creek. This r ent to treated stormwater through additional wetlands would provide a greater degree of Ir; runoff prior to its entering Fanno Creek. Road Right-of-Way Width • gn Wall Street is considered a Collector road, and the City of Tigard Public Improvemet�C Standards require the following on Collectors: Required ROW: 58-96 feet I Pavement requirement: 34-56 feet curb to curb (including 6' bike lane) Sidewalks: 6 foot sidewalks Planter strips: 5 feet st i Street trees: Street trees are required; must be on the approved street( tj . I 8 of 21 Wall Street Alternatives Analysis,revised March 2005. I l I IThe design of Wall Street includes a 48 foot wide paved roadway-(two 11ft. travel lanes, a 14ft. median, and two 6ft. bike lanes). The.street will have curbs, 5 4 foot wide planters (except where I reduced to mitigate wetland encroachment), and 6 foot wide sidewalks on each side. Right-of- way (ROW) width will be 72 70.feet along with additional widths of up to 20 feet outside the ROW to accommodate 8 foot wide public utility easements and cut and fill slopes. At the bridge crossing, the paved width will be reduced to a 36 foot wide paved roadway 36 feet (two 12ft. I travel lanes and two 6ft. bike lanes) with curbs, sidewalks and handrails €er-a-te width of 50 f et. Note: R/W remains 72 feet. The roadway width and improvements are nearly at the minimum req uired by the City. Construction of a retaining wall on the south side of the roadway in the west half of Phase I. . I would result in a decrease in wetland impact to the West Pond of 195 sq. ft. (0.0045 acre) at a construction-cost of approximately $12,500. Construction of a retaining wall instead of a fill slope on the north side of the roadway in the east half of Phase I would result in a decrease in I wetland impact to. the East Pond of 660 sq. ft. (0.015 acre) at a construction cost of approximately $24,100. Costs to construct wetland mitigation have been calculated by the Oregon Department of State Lands to be $50,000 per acre. Using DSL's figure, the cost to I mitigate for the 195 sq. ft. or 660 sq. ft. of wetland impact is much-less than the cost to construct retaining walls in order to avoid these wetland impacts. It was determined that the cost to , construct retaining walls was not justifiable when compared to the cost to construct wetland I mitigation,.especially considering the minor amount of wetland impact minimization that would,,,, 1 be achieved by utilizing retaining walls. t; , I' Bridge Length Alternatives - An OBEC4 Consulting Engineers/West Consultants/Pacific Water Resources team.was.retained.. �u= by the City to evaluate.hydraulic impacts caused by various bridge options under considerations,,,, .. for crossing Fanno Creek. The Preferred Alternative crosses Fanno•Creek at a location where the=., 100-year floodplain is over 500 feet in width and the floodway is 300 feet wide. The team evaluated bridge options of 160 feet, 240 feet, 320 feet, 400 feet, and 560 feet to determine the . 1 impacts of each option;on the floodplain and the floodway. They-were further directed to contain water. surface impacts below the bridge crossing Hall Boulevard and to consider..the Tigard Library construction just upstream"from the Wall Street extension. The City does not.allow any 1 floodplain encroachment that causes any rise in the 100-year floodplain elevation. For flood insurance purposes, FEMA shows a floodway width and elevation that typically accounts for rises of up to.1 foot in the base flood elevation, but does not allow any-further encroachment that Iwill cause-a rise in the floodway elevation. - . A 160 foot bridge estimated to cost$635,000 was the initially preferred length due to budget Iprojections. However, a bridge length of 320 feet was determined to be the minimum needed to meet FEMA requirements. A bridge shorter than 320 feet would require approval by FEMA and I the local community and the project would need to be submitted to FEMA as a Conditional Letter of Map Revision. Such a process is lengthy,expensive and without assurance-of success. Therefore, a 320 foot bridge spanning the floodway was the selected alternative.The-cost-to I construct a 320"foot bridge is estimated at$1,156,700; a longer bridge is cost prohibitive for the project. I Wall Street Alternatives Analysis,revised March 2005 ' Page 9 of 21 � i i I Table 1. Environmental and Engineering Issues Associated With Alternatives 1 —9 I r) Ahem- Wetland Floodplain Floodway Reason for Rejection of Alternative ative Impact* impact* Distance I (acres) (acres) (feet) 1 0.16 0.48 250 Curve radius for road cannot be met due to location of intersection and stream crossing and railroad ii crossing requirements 2a 0.48 0.65 300 (previous Preferred Alternative) f 2b 0.20 0.08 0 (Phase 1 of previous Preferred Alternative) 3 0.56 0.76 480 Greater wetland and floodplain impacts, impacts to ' higher quality wetlands, longer floodway span; bridge cost prohibitive 4 0.44 0.68 580 Impacts to higher quality wetlands, longer floodway span;bridge cost prohibitive 5 0.16 0.96 270 Greater floodplain impact;fails to meet ODOT requirements 6 0.66 1.13 655 Greater wetland and floodplain impacts; potential I floodway impacts 7 0.29 0.36 320 Unlikely to receive approval of ODOT Major Deviation Request for intersection spacing 8 0.42 0.37 330 Impacts to higher quality wetlands; unable to I acquire necessary right-of-way from owner of industrially zoned parcels _ f 9 0.27 0.55 320 (Proposed Project) _ ,; *Wetland and floodplain impacts for Alternatives 1 and 3-8 are very approximate and are for general comparison I purposes only.Impacts for Alternatives 2 and 9 were based on the preliminary grading plan(final limits of grading not determined)and would therefore be slightly greater than shown.Impact areas for Alternatives 1 and 3-8 were '` ~`� �f calculated using ArcView based upon the approximate location of the road alignments,estimated width of road ,/ grading limits and natural resource mapping.Wetland and floodplain impacts exclude the area located within the limits of the floodway,since the floodwaywould likely be spanned by abridge;as is the case for the proposed project. . 3 IMPLICATIONS OF A NO BUILD ALTERNATIVE The No Build Alternative involves'not constructing Phase 1 of Wall Street. The temporary accesses off of Hall Boulevard for the Tigard library and �' g rary the Fanno Pointe Condominiums would remain in use,resulting in increased traffic congestion on Hall Boulevard and increased potential for accidents to occur. , If Phase 1 were not constructed,there would be no wetland impacts and therefore the proposed ' wetland mitigation would not be constructed. The two ponds on Pinebrook Creek would continue i` to adversely affect water quality in Fanno Creek due to thermal pollution, and the heavily eroded earthen berm on the downstream side of the East Pond would continue to have the potential to fail in the near future,resulting in a large sediment load entering Fanno Creek. 4 ECOLOGICAL SETTING AND FUNCTIONS 4.1 Watershed Setting • The Wall Street project area is within the lower reach of the Fanno Creek watershed, which. consists of 20,500 acres (32 square miles) and includes 117 miles of streams (mainstem and tributaries). The lower reach of Fanno Creek is a low-gradient stream, <0.1 percent, that generally has a wide floodplain and a considerable amount of meandering.t Compared to historic Wall Street Alternatives Analysis,revised March 2005 Page 10 of 21 1J',! L I . Iconditions, Fanno Creek, like most urban streams, has reduced stream health in terms of , hydrology, water quality,channel stability and.fish and wildlife habitat.values. ' An aerial photograph of the project area overlayed with existing natural resources in the project area, including Fanno Creek, the 100-year floodplain, floodway, and delineated wetland I boundaries, is shown in Figure A-5. Two developments, the Tigard Library and the Fanno Pointe development; are currently being constructed adjacent to the project area and their building • footprints along with existing.sewerlines in the project area are.shown in Figure A-6. The I wildlife habitat patch identified in the project area in the Fanno Creek Watershed Management Plan and also identified by Metro in their Goal 5 Fish and Wildlife program is shown in Figure A-7. , _ . , The project area reach of Fanno Creek extends from Hall Boulevard downstream J do nstream to the south I boundary of the new Fanno Pointe,Condominiums development and is a meandering channel k that is deeply incised. It is typified by the following description and figure (Kurahashi 1997). I • ia i s aii i vEncu eiu uis F• MEANDe s W Pi i tli : .,- rrc •/'. 1 . _ ir/� � --4v i 1 Vertical Balnk;Channel ✓�� >:r7 `: ., ;Lower StreamYReacties° V..-_ - : ;4t :.:. _ .:__ =, =F -1 t• • • :kit m^t IVertical Bank Channel—Lower Stream Reaches '•• Stream Order:Third and fourth order with less than 3%slope • Hydrology: Perennial flows • , • •. Soils: Erodible during high-flow(bankfull).events, but moderately stable in vertical position due I to high clay content. May or may not have high soil phosphorous levels. Deposition of . upstream soils occurs on the open floodplain. • Typical Plant Community: Oregon ash, red alder,willow, black hawthorn, red-osier dogwood, I Oregon white oak, nootka rose,snowberry, and Douglas spirea. Often dominated by non- native blackberry, reed canarygrass and common hawthorn. • . Fish and Wildlife Habitat:Continuous along the floodplain, but little upland habitat. Lack of, . ..large woody debris and loss of shade reduce fish habitat. I • Land Use: Moderate to extensive encroachment by residential and commercial properties. Floodplain may be extensive. The stream channel in this reach is less complex than historically, due to channel straightening • and incision. A large meander of the stream just downstream from Hall Boulevard, was cut-off in the 1970's, probably as part of a sewer construction project. Removal of that meander shortened ,. Fanno Creek by about 450 feet. Stream channelization and shortening have deleterious local I Wall Street Alternatives Analysis,revised March 2005 • Page 11 of 21 effects, such as increased velocity, increased sediment transport, degradation, and bank ' instability, as well as effects to upstream and down stream reaches. Two Fanno Creek tributaries flow through the project area. A small tributary to Fanno Creek, Pinebrook Creek, flows west to east through the project area. This small stream has been highly altered from its historic condition. The channel has been re-routed, and two ponds (referred to as the East Pond and West Pond in this project) were constructed in the 1950's and 1960's. Red Rock Creek flows east to west into the study reach. This stream also appears to have been highly altered by past land use practices. Wildlife habitat in the Fanno Creek watershed was evaluated in the Fanno Creek Watershed Management Plan on the basis of habitat value, contribution to watershed protection and water quality, unique features or rarity of species, size of habitat patch, restoration or enhancement �! potential, and linkage to other wildlife sites. The floodplain and upland wooded area that includes parts of the project reach on the southwest side of the railroad tracks was identified in- the Watershed Management Plan as one of five significant habitat "blocks" for protection of water quality and wildlife in the watershed. "Reduction in the size of these areas, alteration of the vegetation layers, or other harmful disturbances will diminish the functions and values of the sites." (Kurahashi 1997). The Wall Street project area comprises the northern part of this habitat block or patch (assuming Hall Boulevard to be the northwestern limit of the patch). Forest canopy in the project area is less closed than in the remainder of the patch as a result of past land ,,; use disturbances. Areas where sewer lines were constructed, for example, are open meadows dominated by-reed canarygrass. The wildlife habitat patch in this area totals approximately 73 acre s, including habitat areas on the east and west of the railroad tracks (see Figure A-7). We consider wooded areas on both sides of the tracks to be part of the same habitat patch because many wildlife species will cross the tracks to access both sides. Metro has also identified the wooded areas on both.sides of the tracks as wildlife'and riparian habitat in their on-going Goal 5 fish and wildlife project. Metro rates the wooded area northeast of the railroad as "wildlife habitat class b,"or medium value;they rate the t, wooded area on the southwest of the railroad as "wildlife habitat class a" and "riparian habitat class 1," both the highest value. Limited field evaluation by consultant staff indicates that the • wooded area on the northeast side of the railroad appears to be.more disturbed than the area on the southwest side. The northeast side of the patch is approximately 24.2 acres; the southwest side is approximately 48.7 acres.. Stream channel and corridor conditions for numerous reaches of Fanno Creek and tributaries (. were summarized in the Watershed Management Plan; these are shown in the following table for the two reaches that constitute the Wall Street Project reach (Kurahashi 1997). Wail Street Alternatives Analysis,revised March 2005 Page 12 of 21 I 1 Stream Reach Fanno Cr. Drive to Red Rock - Red Rock Confluence to Hall. Creek confluence . Boulevard (area of proposed impact) (immediately upstream of project) Bank/bed erosion Moderate Severe Soil phosphorous/erodibility* 3/1 3,2/1,3 _ l+ I Percent native plants 0-25 Percent shade 50-75 25 Amount of woody debris Moderate low I Habitat value High low . ° Overall condition Good poor _ Comments Excel. Upland forest near creek --- to northeast I * Soil phosphorous:2=low availability;5=high availability; Soil erodibility:1 =low,5=high erosion potential. • I The 100-year floodplain in the project reach varies from about 325 ft to about 800 ft wide; the regulatory floodway ranges from about 150 ft to 300 ft wide. I Fish surveys by ODFW in 1994-953 found the following fish present (number captured) in lower Fanno Creek (100 meters within the reach from the mouth to Durham Road): western brook lamprey (1), Pacific lamprey (1), cutthroat trout (11), coho salmon (9), speckled dace (1), • I largescale sucker (5), brown bullhead (1), mosquitofish (3),, threespine stickleback.,,.(7), pumpkinseed (1), lar g emouth bass (2), reticulate sculpin (dominant, 534), prickly scul tn, :15 ) : and crayfish (25). No rainbow trout were captured in any reaches of Fanno.Creek in the 1993-94 I fish sampling surveys. The lower Fanno Creek fish sampling area was within 2.5,river miles of the project site. __ . IAquatic surveys of the same areas of Fanno Creek as the 1994-1995 ODFW study were conducted in the summer, fall winter, and'spring of 1999:2000. Lower Fanno Creek was not i surveyed for fish or water quality in the winter of 2000. Survey results found the following fish 1 present(number captured and season) in lower Fanno Creek: western'brook'lamprey (8'su, 1 f, 5 sp), Pacific lamprey (0 su, 0 f, 1 sp), redside shiner (5 su, 0 f, 1 sp), speckled dace (2 su, 0 f,.0 sp), largescale'sucker (1 su, 0 f, 0 sp),' brown bullhead (1 su, 0 f, 0 sp), bluegill (0-su,2 f, 0 sp), 1 largemouth bass (15 su,2 f, 0 sp), reticulate sculpin (86`su, 53 f, 76 sp) and crayfish (2 su, 8 f, 2 sp). Three rainbow trout were captured at the upper Fanno Creek site in winter of 2000. No coho were captured and stocking of hatchery coho in the Tualatin Basin was recently discontinued. IEndangered Species g pec Act listings of anadromous fish include the Upper Willamette River steelhead trout, and Fanno Creek is included as potential habitat for this species. The likelihood I of UWR steelhead using Fanno Creek, however,'is low, based on poor habitat conditions, ' including water temperature, substrate, channel conditions, and food resources (see Biological Assessment prepared for this project). I ' Recent benthic invertebrate sampling in Fanno Creek was used to calculate benthic index of I biological integrity (B-IBI) values.5 Fanno Creek'in the vicinity of'the Wall Street area was considered to be "severely impaired, conditions indicate a high level of disturbance" for the Oregon Dept.'of Environmental Quality criteria, and at the lowest end of the "poor" category I (18-26)for Puget Sound criteria. IWall Street Alternatives Analysis,revised March 2005 - Page 13 of 21 i I 4.2 Ecological Function and Impact Assessment Ecological habitat types in the project area include stream,wetland, riparian and upland resources. Each of these types has subcategories: • Streams o Third-order tributary(Fanno Creek)to Tualatin River o First-order tributary(Pinebrook Creek)to Fanno Creek • Wetlands o Emergent/wet meadow I o Shrub-scrub o Forested o Open water—constructed ponds I • Riparian o Forested bottomland/floodplain o Shrub wetland I o Wet meadow • Upland o Woodland o Meadow—agricultural and disturbed soil o Shrub-disturbed soil Ecological functions provided,or potentially provided-by these habitat types include: • Habitat for aquatic and semi-aquatic fauna • Habitat for upland fauna \) • Stream hydrology moderation and water storage • Microclimate • Streambank stabilization and stream channel structure/dynamics • Sediment,water temperature, and water pollution control • Organic matter input,including large wood(stream and woodland) I These functions are used to assess project environmental impacts in following sections of this report. An analysis of impacts to these functions will also be used to develop mitigation actions I for project impacts that cannot be avoided. 43 Ecological Guidelines for Land Use Decisions I! The Ecological Society of America lists eight guidelines for making land use decisions within an ecological framework.6 These guidelines are most appropriate for large planning areas;however, they are useful at the project scale.The proposed Wall Street project is discussed below in the t; context of each guideline. Ideally,these guidelines would have been used during the initial planning stages of the Tigard TSP and other planning processes; however,their use is instructive and important at this time. I Examine the impacts of local decisions in a regional context. Regional data(i.e. GIS,aerial photography,fish and wildlife data,watershed plan)were examined in order to establish the regional context of the Wall Street project.The regional importance of the wildlife habitat block Wall Street Alternatives Analysis,revised March 2005 Page 14 of 21 1 1 Iin the project area, and regional continuity of the Fanrio Creek corridor were identified and used for project assessment. . . . • . . . A number of metrics have been developed and tested to assess the condition of streams and their associated riparian corridors in the Pacific Northwest. One easily implemented metric tested and I recommended by May et al. (1997)is the density of road crossings.,The investigators concluded that a road crossing density of less than 2 per kilometer maintains a desired condition of riparian continuity. They also found a good correlation between road density and urbanization.(expressed Jas total impervious area) within sub-basins. . We calculated the road density for the Lower Fanno Creek Sub-basin, which extends from the I confluence of Summer Creek to the mouth of Fanno Creek at the Tualatin River, a stream length of 9.60 km(5.97 miles). There are presently 9 road crossings in this reach of Fanno Creek, or 0.94 crossings per km. The addition of a Wall Street crossing of.Fanno Creek would,increase the I road crossing density to 1.04 per km,well within the density of less than 2 per km recommended in the May et al. report. • . • Plan for long-term change and unexpected events. Long-term change is anticipated in land development around the project area,particularly on vacant land zoned for industrial uses on the east side of Fanno Creek. The fact that most of the Fanno Creek corridor land is in public Iownership allows forecasting of relatively minor changes to land use on these properties. Long- term changes in landscape.parameters are anticipated as site vegetation in the stream corridor='and associated uplands matures, and invasive plant species become more established if not • ,;. • Icontrolled. Unexpected events could include very large flood events (100+-year events)that.... would interact with the proposed road and stream crossing. The proposed bridge design that spans the floodway would minimize impacts of the road crossing during these events. Preserve rare landscape elements,critical'habitats, and pe associated species. None of the landscape I elements or habitats in the project area is considered rare in a regional context;however, riparian,floodplain and upland woodlands-are less abundant and widespread in the urban area ' than they were historically. Fanno Creek aquatic and riparian habitats are considered part of the 1 critical habitat for ESA-listed steelhead. Assessment of project alternatives, and the,selection'of the proposed project were largely based on preservation of these habitats. Avoid land uses that deplete natural resources over a broad area. The proposed project would I have limited and mostly local effects on natural resources. Project design elements, such as the bridge spanning the entire floodway, and reconfiguration.of Pinebrook Creek,protect or improve I natural resource functions, such as water quality protection,that may have more far-reaching effects. A project design goal is to limit ecological effects to the project area through design and mitigation. IRetain large contiguous or connected areas that contain critical habitats. •The proposed project would fragment the existing habitat patch along the Fanno Creek corridor, resulting in impacts to wildlife use of the habitat.The road crossing is in the nor'thern'part of the patch,where existing I habitat is more disturbed than in the larger, wider portion to the south:'Some of these impacts are , lessened by the retention of connectivity along the stream corridor within the floodway. The Wall Street Alternatives Analysis,revised March 2005 Page 15 of 21 II 1 effects of the project on critical habitat for ESA-listed fish (steelhead)are considered minimal as 111, P J �--� a result of avoiding impacts to the stream channel and floodway(see the Biological Assessment prepared for this project). Minimize the introduction and spread of non-native species. Landscape design and use of best management practices during project construction will minimize the introduction of non-native species. In addition,we anticipate that mitigation actions for the project will include removal of existing invasive or noxious plants, such as purple loosestrife and Himalayan blackberry.We will also evaluate mechanisms for funding on-going native landscape maintenance after the project is completed. Avoid or compensate for effects of development on ecological processes. We have identified I. and assessed ecological functions in the project area, and have incorporated this information into the project planning and design. Mitigation for unavoidable impacts to habitat and functions will be.based on replacing or improving impacted functions. Implement land-use and—management practices that are compatible with the natural potential of the area. The project design will allow stream channel processes to function at existing levels of performance and to their potential. The proposed re-configuration of Pinebrook Creek will improve functions of this tributary for fish and wildlife and protection of Fanno Creek water quality. The.natural.potential of urban stream corridors such as Fanno Creek has been greatly 111° compromised by patterns and activities-of urban-growth and development:A..design goal of this project is to avoid and minimize ecological impacts to the extent practicable, and to implement mitigation,and enhancement activities that are function-based in order to.achieve a measure of - �` natural potential. 5 ECOLOGICAL IMPACTS OF ALTERNATIVES t' Two types of impacts have been evaluated for project alternatives: 1) disturbance or removal of habitat, and.2) disruption or elimination of ecological functions. Under the first impact type, the amount.of wetland and wildlife habitat2 removed or disturbed has been calculated using GIS I! tools3. These numbers are shown in Table 1. The following paragraphs discuss the effects of project alternatives on the ecological functions introduced in Section 3. - Each of the ecological functions listed earlier in this report is discussed below in regards to the project alternatives. Habitat for aquatic and semi-aquatic fauna Fanno and Pinebrook Creek, and their associated stream corridors (riparian and upland) provide habitat for a variety of animals that are strictly aquatic (such as fish and some aquatic invertebrates), aquatic during one life stage (such as some aquatic insects and amphibians), or 2 Wetland area impact is based on the wetland delineations conducted for the project.Wildlife habitat area impact is based on identification of a"habitat patch,"as shown in report figures.In some,cases,an impact might include wetland and wildlife habitat if the wetland is within the boundaries of the wildlife habitat patch.In these cases,the area of impact is counted twice,once as wetland,once as wildlife habitat patch.It should b a noted that wetlands outside the wildlife habitat patch also provide wildlife habitat. 3 For purposes of impact assessment,we have assumed an average disturbed area width of 90 feet for the road corridor.The real width varies along each alignment,sometimes being greater or less than 90 feet. Wall Street Alternatives Analysis,revised March 2005 Page 16 of 21 I Ihighly dependent on the stream for life requisites (such as turtles, beaver, waterfowl and wading birds).,_Direct effects to aquatic habitat are 'actions such as filling or excavating the stream channel, armoring the bank, or placing bridge supports in the stream. Indirect effects are I discussed below for water quality, temperature, wood debris and other functions. I No direct effects to Fanno Creek aquatic habitat.would result from any of the project alternatives. The proposed bridge for all alternatives would span the stream channel and floodway, and no fill, excavation, or streambank armoring, are proposed. The presence of a bridge might increase' I shading of the stream during a small day compared existing g g portion of the da corn ared to existin conditions; this is not seen as a significant effect. I Alternatives 2, 7, 8 and 9 would impact one or both of the human-made g onds along Pinebrook !i P . Creek. The ponds have non-native mosquito fish (Gambusia affinis), a variety of typical aquatic invertebrates, vascular aquatic plants and large amounts of algae (in the summer).,Alternatives 2 I and 8 would each fill a small portion of the northern edge of the west pond; alternatives 2, 7 and 9 would each fill,a portion of the west end of.the east pond and span (bridge) a portion of the pond.. These impacts would reduce available habitat for aquatic invertebrates, frogs, water fowl,.. I wading..birds, and possibly turtles (although turtles have not been documented in either pond). The presence of the .completed road would introduce human activities,that would.have a disburbance effect on wildlife,resulting in reduced presence or activity of some wildlife.:species:. IHabitat for.upland fauna . 4 Although.,,,the areas described below are not regulated by the City as.protected areas;fQthe _, following,information was prepared to address public comments received,on the wetland permit application. . . . _ .. A wildlife habitat patch has been identified in the.project:area in.the Fanno Creek Watershed Management Plan and by Metro in their Goa15 Fish and Wildlife program. For this project, we have established a boundary for .this wildlife habitat patch based on aerial photography Iinterpretation and field evaluation (see-Figure A-7). The wildlife habitat patch includes riparian and upland habitat along Fanno Creek, as well as a large, upland wooded area northeast of the railroad but otherwise contiguous with the Fanno Creek corridor habitat. A more detailed I . description of the habitat,is presented in Attachment E of the wetland permit application. Although not included in any of the mapping referenced in this report, we also consider upland meadow areas, primarily non-active agricultural fields on the west side of Fanno Creek, to be Ipotential nesting habitat for native turtles that might be present in the area. Stream-associated habitat also can provide a movement or migration corridor for a variety of wildlife species along the Fanno Creek corridor. All of the project alternatives cross p the wildlife habitat�patch and Fanno C J p (and Creek; except for Alternative 6) in the northwestern lobe of the patch. The patch width along Fanno Creek in this. Inorthwestern portion ranges from 50 to about 400 feet wide (total width, both sides of stream), and is'the most disturbed area,of the wildlife habitat patch. Past land use activities, including agriculture, filling, and sewer construction have fragmented habitat continuity, removed I vegetation, and introduced non-native invasive plant species such as reed caharygrass'and Himalayan blackberry. The existence of the project will ;fragment the habitat patch generally i ii Wall Street Alternatives Analysis,revised March 2005 Page.17 of 21. I east-west. The northern alternatives would result in a smaller, and generally less usable (for I wildlife) fragment at the north end of the patch. This fragmentation will create a potential barrier to movement of wildlife that travel on land, and a potential area, the roadway, where Wildlife can I be killed or injured by motor vehicles. Construction of the roadway is anticipated to have only a minimal effect on wildlife movement along the Fanno Creek corridor. Existing east-west travel corridors across Fanno Creek are currently present immediately north of the project area on the Fanno Creek Park site and south of the project area on the Fanno Pointe open space tract to be I deeded to the City. These east-west corridors will be under City ownership and are located in areas that are not planned to be developed; therefore, east-west travel across Fanno Creek will be preserved both north and south of Wall Street. The project will not prevent north-south travel along Fanno Creek. A travel corridor along Fanno Creek will be present underneath the 320 foot wide bridge spanning Fanno Creek and its floodway. I Table 2 shows the amount of wildlife habitat patch affected by each alternative, by linear feet and acres of disturbance. Alternatives 3 and 4 affect the greatest amount of wildlife habitat based , on length of disturbance. Alternatives 3, 4 and 8 each have the greatest amount of disturbance based on acreage. Alternative 8 is the only one that also would affect a portion of the habitat patch on the northeast side of the railroad. It is important to note that these calculations included tli the bridge sections of each alternative, where vegetation will be removed, but no fill will be placed. Construction of the bridge will require larger shrubs and some trees to be removed, although herbaceous vegetation and small shrubs will remain underneath the bridge. In some '' important ways, the bridge has less disturbance to wildlife habitat than the-road fill sections of the project; a-large area of habitat will remain under the bridge because it will span the floodway; wildlife movement can continue within the floodway under the bridge, and the bridge height, 6-8 feet above ground level,will allow light penetration to support vegetation underneath. Table 2.Wildlife Habitat Patch Disturbance - `If Project Disturbance 'Disturbance- Acres as%of Alternative (linear feet) (acres) total patch 1 370 0.52 - 0.7 2 540 0.86 1.2 1 • 3 770 1.14 1.6 I I - 4 830 1.16 -1.6 5 300 0.45 0.6 6 530 0.86 1.2 7 590 0.87 1.2 _ 8 490 1.33 1.8 ,. 9 590 _ 0.85 1.2 Id Stream hydrology moderation and water storage Riparian, floodplain and upland areas play a role in stream hydrology and floodwater storage. Rainfall intercepted by vegetation and stored in soil can add to shallow groundwater in areas of , groundwater recharge, and stream "flashiness" is reduced if rainfall is intercepted. A functional floodplain can store floodwater over a short period and reduce flood peaks downstream. The riparian and stream-side upland undeveloped areas in the project reach provide rainfall I interception and storage; however, Fanno Creek is so deeply incised, the floodplain is generally a not connected to the stream except during the highest flows. I, I Wall Street Alternatives Analysis,revised March 2005 Page 18 of 21 I r_ 1 The.impacts of the proposed project on this function will result from the removal of vegetation (trees, shrubs, groundcover) and the construction of impervious surfaces (roadway and I sidewalks). Table 3 shows the estimated amounts of ground disturbance (i.e. clearing, filling) for each alternative. Alternatives 1, 3, 4, 5, 6, 7 and 9 each would impact between 2.5 and 3.2 acres. I Alternative 8 has the largest amount of ground disturbance at 6.15 acres. These calculations do not include the area underneath the bridge section of each alternative since herbaceous vegetation and small shrubs will remain underneath the bridge and therefore, this area will Icontinue to provide water storage function.. The impact of the project on the hydrology and water storage function will be mitigated by capturing and treating stormwater runoff from the project paved surfaces and directing the treated runoff into wetland or floodplain areas within the project site. . I TABLE 3.Total Estimated Disturbed Area for Project Alternatives , Project Total Estimated Disturbed Area(acres) Alternative 1 2.52 2 3.28 3 2.76 . : 4 . 2.49 : 5 2.63 6 2.15 F �` 7 3.15 8 6.15 " ' ti 1 9 3.07 . Microclimate . Shrub and wooded portions of streamside and upland habitat, if large enough, can alter climate I conditions on a.small scale (i.e. microclimate), providing a different set of temperature, light, sound and humidity parameters that are important for some species of wildlife. This function can also affect conditions within adjacent human development. The impact levels of project I alternatives on microclimate are similar to those discussed above in the section on habitat for upland fauna: In general, the alternatives that are further north will leave larger patches of woodland, and thus more opportunity for microclimate differences. _ Streambank stabilization and stream channel structure/dynamics The roots of riparian vegetation provide structural stability to streambank soils, reducing erosion. I The above-ground parts of plants provide water velocity protection to soils. Woody vegetation along'streams can influence the meander dynamics of the channel-by providing this.erosion - protection. Large wood pieces (i.e. trees and large branches)that fall into the stream channel also I influence channel structure, meander pattern and hydraulic dynamics, as well as physical habitat parameters for aquatic fauna. I Fanno Creek in•the project area is very incised due to historic and present land uses that have altered the channel and stream hydrology. Stream banks are generally very steep (many are vertical) and high (8+ feet) through most of the project reach of Fanno Creek. While existing Wall Street Alternatives Analysis,revised March 2005 Page 19 of 21 trees and shrubs provide some bank stability in the reach, banks are undercut below the root depth of some of this vegetation. The function of streambank stability is compromised by this `. altered channel condition and hydrology. 1 Every project alternative would result in the removal of vegetation from the project right-of-way. However, because each alternative includes a bridge that would span the floodway, impacts to vegetation on and adjacent to the banks of Fanno Creek would be minimized, Mitigation for impacts to this function will be to retain shrubs under the bridge, and to cut, rather II than remove trees in the bridge path to leave lower trunk and roots intact; however, short-term construction-related impacts are likely to occur. Sediment, water , temperature, and water pollution control • Floodplain and riparian areas along streams can intercept and filter out sediment carried by stormwater runoff. Vegetation, soil and soil microorganisms can remove many urban or agricultural contaminants from stormwater runoff before they reach the stream. Streamside shrubs and trees provide shade that can maintain cooler water temperatures in the stream. Large in-stream wood pieces can trap and retain sediments to some extent. Fanno and Pinebrook Creeks are presently in degraded condition relative to sediment load, temperature and water quality due to urban development and past land use.practices. Most of the project reach of Fanno Creek and adjacent land is in public ownership(City of Tigard,Metro), so much of the existing vegetated area will remain intact, and future sediment and contaminant sources will be minimized and controlled. All of the project alternatives would result in removal of or disturbance to soil and vegetation in the project right-of-way (see Table 3 for estimated acreages). There will be a potential for increased sediment and contaminants in stormwater runoff during project construction. Following construction, the paved roadway will be a source of sediment, contaminants and increased stormwater temperature. �! Mitigation of impacts to this function will include the use of sediment and contaminant control BMPs during construction, and construction of water quality facilities to treat roadway runoff. Treated runoff will be directed to wetland or floodplain areas on the site instead of directly to a stream, increasing the potential for these areas to provide the sediment, temperature and water pollution control function. Organic matter input,including large wood Organic materials, living and dead, produced in riparian, floodplain and upland areas along streams provide critical support for biological processes. Leaves, twigs and large wood that fall into the stream or onto soil surfaces support a variety of food webs in these habitats. Living '` material, in the form of plants and animals, are also parts of these food webs. Many food webs have branches in aquatic and terrestrial habitats; for example, terrestrial insects living in streamside vegetation fall into the stream and become food for fish and other aquatic fauna. Wall Street Alternatives Analysis,revised March 2005 'Page 20 of 21 1 All of the project alternatives would result in the removal of organic material (living and dead plants, organic litter, etc.) from the project right-of-way. The extent of this removal is shown in Table 3. This removal of organic material and its sources could have a small localized effect on ' this function; however, this impact is not considered to be significant. G:\.2003\03071 Tig\Permit\AltemativesAnalysis.doc Kurahashi and Associates. 1997.Fanno Creek Watershed Management Plan.Prep.For Unified Sewerage Agency, Hillsboro,OR. 2 Bolton,S and J.Shellberg.2001.Ecological Issues in Floodplains and Riparian Corridors.White Paper prep.For WA Dept.Fish&Wildlife,WA Dept.Ecology,WA Dept.Transp. 3 Ward,D.L. 1995.Distribution of Fish and Crayfish,and Measurement of Available Habitat in the Tualatin River Basin.Final Report of Research.OR Dept.Fish&Wildlife. 4 Hughes,M.L.and K.A.Leader.2000.Distribution of Fish and Crayfish,and Measurement of Available Habitat in the Tualatin River Basin.OR Dept.of Fish&Wildlife. ' 5 Frady,C.,B.Gerth,J.Li and L.Hennings.2003.Portland Metro Benthic Invertebrate Analysis.Draft Version: May 13,2003.Prep.For Metro Regional Services. 6 Ecological Scoiety of America.2000.Ecological Principles for Managing Land Use.Brochure produced by ESA ,., Committee on Land Use.Washington,D.C. • 7 May,C.W.,R.R.Horner,J.R.Karr,B.W.Mar,and E.B.Welch. 1997.Effects of Urbanization on Small Streams in the Puget Sound Lowland Ecoregion.Watershed Protection Techniques.2(4):483-494. . • 1 1 1 1 1 1 Wall Street Alternatives Analysis,revised March 2005 Page 21 of 21 1 Appendix A: Project Context: Tigard Transportation System Plan The Tigard Transportation System Plan (TSP) was prepared by DKS Associates in October 2001 and adopted by the City in January 2002 to guide the City's twenty year vision of transportation system needs. The TSP is intended to replace transportation related goals and policies in the Tigard Comprehensive Plan and builds upon material developed in the visioning process from January 1998. The TSP evaluated existing conditions and deficiencies for several modes of transportation including pedestrian, bicycle, public transit, and motor vehicle. Numerous transportation improvements were recommended to address future deficiencies throughout the City based upon the City's goals and policies, future demand and land use, funding and implementation. Tigard's east side was identified as one of four primary locations where future }; connectivity/circulation problems were determined to be significant. The need to improve east- west circulation in this area was identified and is discussed below. Several options for improving east-west circulation and capacity, including the proposed Wall Street extension, were evaluated in the TSP and are described below. Due to Tigard's location at the junction of Interstate-5 and Highway 217 and the fact that the City is divided by Highway 99W, its arterial street system is impacted by the performance of these regional facilities. Accidents on I-5 or Highway 217 result in traffic detourin g through Tigard, snarling local circulation on a regular basis. Highway 99W is the primary arterial through Tigard, and much of the east-west motor vehicle travel is served by that highway. The segment of Highway 99W between Hall Boulevard and Highway 217 is one of four areas of Tigard with '' the highest automobile accident rates. Between 1999 and 2002, there were 136 accidents on this segment of Highway 99W. 1 Hall Boulevard (arterial) and Highway 99W (principal arterial) are both classified by the City as arterials. Recent traffic counts (1999) indicate that Hall Boulevard carries approximately 12,000 to 23,000 ADT (Average Daily Traffic) while Highway 99W carries a pp roxima tely 45,900 ADT near downtown Tigard. The Highway 99W/Hall Boulevard intersection was evaluated in the TSP using the 1994 Highway Capacity Manual and was determined to be operating at a level of service D in 1999. This is generally considered to be acceptable operating performance for a signalized intersection. The TSP concludes that future demand for the Highway 99W corridor will result in level of service F conditions, even with significant improvements including road widening and addition of turn lanes at intersections. The data provided in the TSP regarding accident rates and traffic volumes on Highway 99W and Hall Boulevard illustrate why an alternate east-west route to bypass Highway 99W, particularly the segment from Hall Boulevard to Highway 217, is necessary. Several options for improving east-west circulation and capacity were evaluated in the TSP and are shown on Figure A-1. Two 111! alternatives that were discussed in Chapter 8 of the TSP included the Bonita/McDonald alternative and the Carman/Durham alternative. These two alternatives would use existing routes to improve east-west connectivity. The Bonita/McDonald alternative included widening Bonita Road and McDonald Street to five lanes each. Because Bonita does not connect to the I-5 freeway ramps, it was determined that increasing this corridor to 5 lanes would provide limited benefit. The Carman/Durham alternative would widen Carman Drive at I-5 to 5 lanes and connect it directly to Durham Road. This option would eliminate the level of service F conditions of Carman Drive and provide safer operation for the majority of vehicular traffic. Wall Street Extension Alternatives Analysis Appendix A • l { 1 Two additional alternatives for improving east-west circulation and capacity were identified in several figures in Chapter 8 (included as Figures A-2, A-3 and A-4) and are also listed in tables of future street improvements in the TSP. A third option for improving east-west circulation and capacity is the Wall Street Extension, which was included in Table 11-6 of the TSP that listed future street improvements. A fourth option for improving east-west circulation and capacity is the extension of Walnut Street from its intersection with Highway 99W to Hunziker Street. Both of these new alternative routes are recommended for implementation in the TSP. The Wall Street 1 Extension was proposed for construction in line .with development as it occurs in the ' undeveloped area between Hall Boulevard and Hunziker Street. 1 The Wall Street Extension and the Walnut Street Extension are designated as preferred new alternative routes to Highway 99W and Hall Boulevard. The Bonita/McDonald alternative would overload the already congested 72nd Avenue requiring widening of 72nd to a 5-lane configuration sooner rather than later. In addition, that alternative does not provide access to I-5 and provides a limited benefit. Furthermore, widening of McDonald Street would be extremely difficult because of the steep terrain immediately adjacent to the street for about half of its length and the proximity of homes on the other half. The TSP recommends that McDonald Street remain as a S- lane road. The Carman/Durham alternative is feasible and provides direct access to I-5. However, it is located in south Tigard. East-west connectivity midway between Highway 99W and Durham road is desirable for enhanced infra-city circulation. The Walnut Street and Wall Street extensions provide that connectivity. The Hall Boulevard/Hunziker Street/Scoffins Street dogleg north of the railroad tracks creates a congestion point for traffic desiring to access the Tigard Triangle (the area bounded by Highway 99W, Interstate-5, and Highway 217). This dogleg would have to be realigned to allow for enhanced traffic flow north to Highway 99W or east to the Tigard Triangle and for the Walnut Street Extension to work properly. However, any traffic that can be diverted south of that dogleg would alleviate existing and future congestion at this intersection. The proposed Wall Street extension connects Hunziker Street and Hall Boulevard south of the Hunziker/HahJScoffins dogleg intersection. The new roadway is projected to carry about 5,000 to 7,000 vehicles per day and would reduce the level of traffic at two key intersections (Hall/Hunziker and 72" Bonita Road). The new street would allow northbound traffic from south Tigard to bypass Hall Boulevard north of O'Mara Street and proceed directly to Hunziker Street, then north to the Tigard Triangle via 72nd. A proposed future overcrossing of Highway 217 connecting Hunziker with Hampton Street would allow traffic from south Tigard to connect directly from Hall Boulevard to the Tigard Triangle then to Highway 99W. Without the Wall Street connection, traffic is forced to use Highway 99W, Hall Boulevard and 72nd Avenue where capacity is not available and can only be provided by further widening of existing facilities. Based on traffic modeling conducted for the Tigard TSP, this new Wall Street connector produces adequate capacity at those two intersections and relieves Hall Boulevard sufficiently to allow that street to function adequately at 3 instead of 5 lanes for the next 15 to 20 years. The long-term projections of the TSP requires full widening of Hall Boulevard and 72nd Avenue to 5-lane configurations, completion of the Wall Street Extension from Hall to Hunziker, and completion of the Walnut Street Extension connecting Walnut Street to Hunziker Street and 1 i Wall Street Extension Alternatives Analysis Appendix A I from there to the Tigard Triangle. The two new east-west connectors provide the alternate routes I' needed for intra-city traffic by connecting east Tigard (Walnut Street Extension) and south II Tigard (Wall Street Extension) to north Tigard without traversing Hall Boulevard all the way north to the Highway-99W/Hall Boulevard intersection. ,'` The widening I° ning of Hall Boulevard has been suggested as a potential alternative to the Wall Street Extension. The TSP recommends the widening of Hall Boulevard, the widening of 72nd Avenue, '' and the construction of the two new east-west alternatives (Walnut Street and Wall Street extensions) as all being necessary over the long term. The widening of Hall Boulevard is not a ' suitable alternative to the Wall Street Extension because it does not rovide the p east-west connectivity needed in this area of the City. However, the construction of the Wall Street Extension would delay the inevitable widening of Hall and 72nd for at least 15 years or more. I The Wall Street extension includes an at-grade crossing of the Southern Pacific railroad tracks. The at-grade crossing at Wall Street will enhance the movement of northbound traffic by providing another route across the rail lines. The two options for northbound traffic i I P a s de from Highway 99W, are Hall Boulevard and 72nd Avenue. Hall Boulevard northbound is already congested at the Hunziker Street/Scoffins Street/Hall Boulevard dogleg. In addition, traffic is often stopped at the railroad crossings just north of Burnham Street whenever trains perform their switching maneuvers. Likewise, 72"d Avenue is also congested south of the Hunziker intersection during the peak travel hours. By providing an east-west connection south of the ,' existing crossing on Hall Boulevard, Wall Street allows motorists to connect to Hunziker, then to 72"d Avenue north of the business and industrial strip. The options on 72"d Avenue at the Hunziker/72"d intersection include entry onto Highway 217 or direct access northbound to the Tigard Triangle. Wall Street, therefore, allows traffic to bypass the problematic 1! Hunziker/Scoffms/Hall intersection, introduces a second crossing of the railroad tracks as an alternative to Hall Boulevard, and reduces traffic congestion on 72nd Avenue between Bonita i Road and Hunziker Street. A commuter rail system, linking Beaverton/Hillsboro and Wilsonville, has been discussed, and 1 preliminary analysis has been conducted to determine possible alignments and station locations. t.. The Beaverton-Wilsonville commuter rail will likely be constructed along the railroad right-of- way and would have one or two stops in downtown Tigard.,The commuter rail will impact the j traffic flow on both Wall Street and Hall Boulevard during the commute hours. However, unlike the freight train switching maneuvers, which can stop traffic up to 10 minutes,the commuter rail train delays are expected to be 30 to 45 seconds at most because the trains merely pass through IIi and do not stop at the crossings. These relatively short delays are acceptable and should not pose any problems for traffic movements in general. The benefit provided by two routes across the tracks outweighs any impact the commuter rail train runs would have on the traffic flow. '; • I I 1 Wall Street Extension Alternatives Analysis Appendix A 1 u ~ . — ^ �� °. "' .1. Optiort 'I: Bonita RciltricDondel St. i:32211 i Option 2: Carman Dr3Durham Rd. ''''' ''''''. 4#41.t.;:;?'"l'' '04' ''''P'' i::421....1.7.-4:7%. .4,,. i'+'.tit*:' . ." .'"' n! ...ii:+g•-• eleeennnevle 41'i..,T, , „„:.,. ..' :4....4..4:'.'..4'.'6..4..:`:i..........4..11 ,..,0„..'' ,.:.'z.".,..4:4,': ;, ..i''.••■•:. 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'tk.''''4'":'- • -----,'-4 ,41.--, ,--,z._../L i_i_ , , ,- .N. s i--, . If , - - : :4 t -r . . •„ '''kamwei --.... ...,..- • .- ,,,„.; ,, _I *47-0 ,-.. ,.- _„,.1.( . - ---)r----. ,.—N,.._... 2,•,-. i 4 , -'\t a'rt4.-t1Y1' -.7,'':PO '• ;'/", -"-' ...PIVA*SE ir. 1- '44 ....-\ 7. .- • ,..,... Wetland impact area•=,0.21 acre(3,481 cu.yds.) '. -,. ., ilia 4 ""41' ""•••••■.,., hitli'iii atp . i i /•ij I r ‘ i I:SI -""••■..w..fteri '‘ /,' 4 _--.. ...- ''- -7' ....' .7 t„P; 1t .`i:.'.Z7'''%74.1!4 i ''..-0° Floodplain unpact area 0.08 acre ' . Ve•;■''......• s. •••••-......r.•'17•-•''''■:"a ar-''''•.11';:••;,r-'7.",,...:;',::::iit,e're;,,,',0' •',..::-.+:.-:..;. Giu,,,x.,..,,,,:i.,_.:,-.,-..-.- .41,c0,0,:o•-•/Car:. ..•.,hip •te-,."-se' It *. •-•- 01.7... 'Mr 0 1 ey,-, Also,-:.0 e, ,•it,".. i . ,1 ."--.. 41/4ss'40111.S.Alt,II: ':..!!'s.'"'CI'll'.'•' .-..—tiwt ■•. : ,t00 yr oclploin .•: ... 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'. •- V : 44. . • f;; ', ,i/f i ,,,:11.!.' \ \ 1 : ji:24 ze;::. _—— I cmdiviibadarduftraTxeng OM I -,1100 ".f.-- 0 i ; " 1...4 ' • I i I • i ' .1 •INT ... • ) 1 Id til..':,...., 1 I l. i I (C) 628 sq.IL -■—•- at •,.. • ' •,,:ii,e, fll ____: i ! ' i \ - -7,L r'-I: I CY•j; CV, , f ■ • 4 ............._ •,... -. ;; -,.:___ . . ... , , .,..1; ;.., • ...- DAlt IttSSO. Kt 11, ■INA 1 1,12.1 DE HAAS We 30)-SX 0.61. MG IL COMM.. A, SHEET OICSIONED et no •1• ...-.1,'"••■;...„ sAlk.: j MAMA D'Ass 97070 - WALL STREET - LID • SRAM SY: is, , .,,, V Bripa'.... ssociates, Inc. alCOCID St ILID . Ore*Wows 1 Oman -.,'1,i0 .` balf.. XX-11.01 .. .. .... FTISMSW44° -.t-LL.1.1.1 STREET & UTILITY IMPROVEMENTS 1 • . , SCAM AS SHOW art OF TIGARD STREET OF .11(=nab fli LCCa.“-VS\SA0\02-.11INISMASI. MACS MA HS CATI December 17, 7007 I 02.644118 RI INGINCSASAS OtP•Andsil 1 ' . • . . Figure A-11. Proposed Floodplain Impacts for Alternative 9 . . 4 • . . , • . . . - . . . • • - • • • • . • . . , . • • . . ----- -- — - — .• _._ ....._, _.. _._______ 1 1 1 t 1 1 N ?LLV7 flW v 52E 1 'Z L1' FH )g 1 411 1 ,: 6 Ds I 0 .` Portland Office E+flironmenta1 eerviCos " 434 NW Sixth Avenue,Suite 304 t' I. r' PoNlond,Oregon 97209 . A 01 Yl 510 N.,t)P '. . Te1503.224.0333 Fox 503.224.18.51 ' �t ll7fi 1NVIRONMENf#I CONSULTANTS WWW.SWC1).00111 i !!7 ECE/ Vt. 1 No V 2 E LJ J Cr 2005 November 23, 2005 ciOjjp IACKEN- 46 • Louise Bos Kathryn Harris I Washington County Resource Coordinator Washington County Permit Evaluator Oregon Department of State Lands U.S.Army Corps of Engineers 775 Summer Street NE, Suite 100 P.O. Box 2946 • 1 Salem, Oregon 97301-1279 Portland, Oregon 9720.8-2946 • SUBJECT: City of Tigard Wall.Street Project; DSL#31719-RF; Corps#200300137 IRequest for Modified Wetland Permit . Dear Louise& Kathryn, . I . Please find enclosed a revised wetland permit application for the City of Tigard's proposed Wall Street . project. The DSL and Corps wetland permits are valid until January 27, 2007.and September 30, 2007, 1 respectively. Construction of Phase 1 of the project is anticipated to begin in 2006. Phase 1 of the project was recently redesigned to meet the local planning r uirements of the City of Tigard. The . redesign of Phase 1 involves reducing the length of roadway from 425 feet to 360 feet and shifting the Ilibrary access and Fanno Pointe Condominiums access to the west' to avoid development within the 100-year floodplain. The length of•Phase 2 has been correspondingly increased by 65 feet at its western extent. The overall length of the proposed project is unchanged from the previously permitted- design. The redesigned Phase 1 includes a retaining wall along the eastern edge of the Fanno Pointe Condominiums access to minimize the amount of wetland impact. Previously permitted wetland impacts were 0.25 acre for Phase 1 and 0.09 acre for Phase 2, for a.total project impact of 0,34 acre. As Ia result of the redesign of.Phase 1, proposed wetland impacts for Phase•1 are 0.11 acre and for Phase 2 are 0.19 acre. The total proposed wetland impact for the project has been reduced to 0.30 acre. Revised project drawings are included with the revised permit.application. Due to the redesign of Phase 1 of the ' Iproject, the wetland mitigation area has been revised slightly, and a revised wetland mitigation plan is enclosed. IPlease give me a call at your earliest convenience to discuss the project. . Sincerely, I ,-StaC44 r C1I/v/ Stacy N. Benjamin I Senior.Wetland Ecologist c: Vannie Nguyen, City I of Tigard . Marlin DeHaas, DeHaas &Associates Geraldene Moyle, Group Mackenzie . I . i o lied -;;; Joint . Tietwa z*,� ,- -, la Army Corps Permit Application Form F ° �'l Jf Engineers THIS APPLICATION WILL MEET THE REQUIREMENTS OF BOTH AGENCIES . ; Portland District I AGENCIES WILL ASSIGN NUMBERS • Corps Action ID Number Oregon Division of State Lands No. SEND ONE SIGNED COPY OF YOUR APPLICATION TO EACH AGENCY I District Engineer .. State of Oregon ATTN: CENWP-CO-GP : Division of State Lands PO Box 2946 775 Summer Street NE I Portland,OR 97208-2946 Salem,OR 97301-1279 503-808-4373 503-378-3805 O Applicant Name Vannie Nguyen,P.E.Engineering Manger Business Phone#(503)639-4171 ' I and Address City of Tigard Home Phone# 13125 SW Hall Blvd. FAX#(503)624-0752 Tigard,Oregon 97223 I OCo-Applicant Stacy Benjamin Business Phone#(503)224-0333 •Authorized Agent SWCA Environmental'Consultants Home Phone# OContractor ' 434.NW 61I'Avenue, Suite 304 FAX#(503)224-1851 t Name and Address Portland, Oregon 97209 Property Owner See Attachment A Business Phone# . 1 (if different than applicant) Home Phone# Name and Address FAX# ' ,l PROJECT LOCATION I _,keet;Road•or other descriptive location Legal Description Proposed Wall Street extension extends northeast Quarter Section Township Range from SW Hall Boulevard to SW Hunziker Street 1 &2 ' 2S •• 1W In or Near(City or Town) County Tax Map# . Tax Lot# 2S101 800, 1100, 1200; 1201, 1202 • Tigard Washington 2S102DD 100,200,300,90000 , Waterway River Mile Latitude Longitude Pinebrook Creek&wetlands 45°25' 17"N 122°45' 51"W(at Hall Blvd.) At approximately river mile 3 of Fanno Creek 45°25'39"N. ' 122°45' 23"W at Hunziker St. I Is consent to enter property granted by the Corps and the Division of State Lands? • Yes 0 No ' 0 PROPOSED PROJECT INFORMATION Activity Type: •Fill •Excavation(removal) 0 In-Water Structure 0 Maintain/Repair an Existing Structure I Brief Description: Construction of Wall Street extension to connect SW Hall Blvd.with SW Hunziker Street Fill will involve • cubic yards annually and/or cubic yards for the total project 1,647(Phase 1)+ 1,302(Phase 2)=2,949 cubic yards in wetlands or below the ordinary high water or high tide line.: 111 Fill will be 0 Riprap ORock •Gravel 0 Sand 0 Silt 0 Clay 0 Organics •Other native soil,asphalt,concrete Fill Impact Area is OA 1 (Phase 1)+0.19(Phase 2)=0,30 Acres; length; ' width; depth 1 Removal will involve ' cubic yards annually and/or cubic yards for the total project. • 2 I 99(to construct wetland mitigation) cubic yards in wetlands or below the ordinary high water or.high tide line, Removal will be 0 Riprap 0 Rock 0 Gravel 0 Sand 0 Silt 0 Clay .O Organics •Other native soil 1 Removal Impact Area is 0.28(to construct wetland mitigation) Acres; length, width; depth I the disposal area: Upland? •Yes 0 No . Wetland/Waterway? 0 Yes •No Are you aware of any Endangered Species on the project site? . 0 Yes •No If yes,please explain in the project Are you aware of any Cultural Resources on the project site? 0 Yes •No description (on page 2,block 4) , Is the project site near a Wild and.Scenic River 0 Yes •No See Attachment B,page 5 I T • PROPOSED PROJECT PURPOSE &DESCRIPTION IProject Purpose and Need: See Attachment B • I Project Description: See Attachment B IIHow many project drawing sheets are included with this application? 13 NOTE: A complete application must include drawings and a location map submitted on separate 81/2 X 11 sheets. IWill any material,construction debris,runoff,etc.enter a wetland or waterway? •Yes 0 No (see Attachment B) If yes,describe the type of discharge(above)and show the discharge location on the site plan. IEstimated Start Date*: Spring 2006(Phase 1) Estimated Completion Date: Fall 2006(Phase 1) *A construction schedule has not been determined for Phase 2. I ® PROJECT IMPACTS AND ALTERNATIVES IDescribe alternative sites and project designs that were considered to avoid impacts to the waterway or wetland. The applicant is requesting a modified wetland permit. Wetland impacts have been reduced below the previously permitted amount of impact. Phase 1 of the project was recently redesigned to meet the local planning requirements of the City of Tigard. The redesign of Phase 1 involves reducing the length,of roadway from 425 feet to 360 feet and shifting the library• Iaccess and Fanno Pointe Condominiums access to the west to avoid development within the 100-year floodplain.The length of Phase 2 has been correspondingly increased by 65 feet at its western extent.The overall length of the proposed project is unchanged from the previously permitted design.The redesigned Phase 1 includes a retaining wall along the eastern edge of the !anno Pointe Condominiums access to minimize the amount of wetland impact.Previously permitted wetland impacts were 0.25 acre for Phase 1 and 0.09 acre for Phase 2,for a total project impact of 0.34 acre.As a result of the redesign of Phase 1, • proposed wetland impacts for Phase 1 are 0.11 acre and for Phase 2 are 0.19 acre.The total proposed wetland impact for the Iproject has been reduced to 0.30 acre. j Describe what measures you will use(before and after construction) to minimize impacts to the waterway or wetland. IA grading and erosion control plan will be developed prior to the start of construction to minimize sedimentation into Pinebrook and Fanno Creeks and associated wetlands in order to protect downstream water quality during project construction. The erosion control plan will meet Clean Water Services Design and Construction Standards and will include Ithe placement of silt fencing at down gradient locations adjacent to the disturbance area and at additional intervals as needed in areas of grading and silt sacks at storm drains in the project site.Bare surfaces, not being actively worked,will be seeded, mulched or paved as quickly as possible. Erosion and sediment control measures will be maintained for the duration of Iconstruction and until vegetation cover is-established. _ NOTE: if necessary,use additional Sheets. I © ADDITIONAL INF012MATION IAdjoining Property Owners and Their Address and Phone Numbers _ Submitted with previous wetland permit application Has the proposed activity or any related activity received the attention of the Corps of Engineers or the State of Oregon in the • past,e.g.,wetland delineation,violation, permit,lease request, etc.? •Yes 0 No IIf yes,what identification number(s)were assigned by the respective agencies: Corps# 20030013.7 State of Oregon # 31719-RF i I - •; ?. . 1. 03 10: 37 FAX 5032241851 • FISH FAX . . . Igl 04 • ............ ..................._____. . — . . . . . ..: .. .it*:„:'(...t.,tinty Planning Department Affidavit (to be completed by local planning official) .• ' ..."his lroiect-is not regulated by the local comprehensive plan and zoning ordinance. . • . . i . . . . project has been reviewed and is consistent with the local comprehensive plan and zoning ordinance. I 1 , .:',....) [kis project has been reviewed and is not consistent with the local comprehensive plan and zone ordinance. . • • • •,-:: ..e....o..iistottcy Of this roject with the local planning ordinance cannot be determined until the following local approval(s) • I . . . . - . • • . !-J1(.•,•oiltaiued. : . . . . . . . . • . . • • • . • . .. O Conditional Use Approval . 0 Development Permit RFre.He: .. • . • • • . Plan Amenclment • . 0 Zone Change. . • DEC i. I . • Other_72yr_X,YEAgeg.14/44OrCitiet, )2, Q 1 Cv4 • . . • . . • . • n ', -.': ..... . 0 ..', 0.;. has not been • .de for local approvals checked above. • .. •i ,• I, 1 i sv,441.0 . .. . . . .•,k,,,,,,,,,.(It'local planninglofficial, -. Title City Date . • •1 . • . . . . :. • .. . .. . .. .. . • • . . . • • • • • . • I •,... .• ! COASTAL ZONE CERTIFICATION . • • . . . . • • i,. ,:• :.,..;,,,.),,, ,1 activity described in your permit application is within the Oregon coastal zone,the following certification is required before - - ..10 •,,,q.01:‘•ai.ion',an be proc4sed. A public notice will be issued with the certification statement which will be forwarded to the Oregon 1,1•1And C:onservaition and Development for its concurrence or objection. For additional information on the Oregon Coastal Zone . • 111(!tt, Program,contact the department at 1175 Court Street NE,Salem,Oregon:97*or.eall 503-373-0050. , 1 • • CENITFICATION STATEMENT ' : • • . • 1 , u,the best ofm i knowledge and belief,the propoSed activity described in this application complies with the approved•Oregon • •:.-.....-,..,.A! 1,..ro; 'Management Program and will be completed in amanner consistent with thevrogram. . . . I . . . . . .. . . • . • . .. . •...: .-..;:sp,;1.,:•..ible • . . --- . . ,, .. • •.:.,,,,t... \lame :„.... Title • , . . . . .. . : • - . • . . . _. . 006 . S t?nature - Date • ' •. . SIGNATURE FOR JOINT APPLICATION ' • . . ,• • ' . . - • . • . hereby made for the activities described herein. I certify that I am familiar with the information contained in the application, ;:ii.. ni.A.or my knowlefilge and beliet this information is true,complete,and accurate. I farther certify that I possess the authority to . , t.,..,-.,F.c i.l.tc.. pl onosed activities. I understand that the granting of other permits by local,county,state or federal agencies does not release me •:•• 1 ,••• ...,.-Lit .f el I tent of obtaining the permits requested before commencing the project. I understand that payment of the required state •,•,.. ,.....1:;.. rr.-does not guarantee permit issuance. . . ••:.,1,,;1:- .•,!•,n.:ven.,j).F.. • EngineeringManager.City of Tigard . -,,,711.: Name .' Title .. , . • . ., • • • • • btaiLl4t-1 . - , 1260 / , et.1,3 O ccuo.s'i gnAture. U . • Date . . . • . . • • . _ . v:,...,,.the! I may act as the duly authorized agent of the applicant. • .• .. I • • , • . : ., . • . • • -....),::.• t.v..1.1,;,..njti . • • - Wetland Ecologist,Fishman Environmental Services.LLC • I . __,.. :Niartie• . Title • • ., . : . • . • . . . . ) . . i .:,.......:0,1 Agent Si -atuie . ' Date • II . ... .• • . , • • • . . . , . ' • - . . , - . I ® SUPPLEMENTAL WETLAND IMPACT INFORMATION* (For Wetland Fills Only) ISite Conditions of impact area :mpact area is 0 Ocean 0 Estuary 0 River 0 Lake •Stream •Freshwater Wetlands INote:Estuarian Resource Replacement is required by state law for projects involving intertidal or tidal marsh alterations. A . separate Wetlands Resource Compensation Plan may be appended to the application, IHas a wetland delineation been completed for this site? • Yes 0 No Three separate wetland delineations were conducted by different consultants in the proposed Wall Street project and mitigation I areas.A wetland delineation report was prepared for the Tigard library site by Kurahashi&Associates in June 2002(DSL WD# 2002-0324;DSL concurrence letter dated October 8,2002).The study area for the library delineation included the proposed library site as well as the Wall Street right-of-way extending from Hall Boulevard to the west side of Fanno Creek.A wetland delineation report for the proposed Wall Street right-of-way extending from the west side of Fanno Creek to the east side of the Irailroad tracks was prepared by Pacific Habitat Services in September 2003 (DSL WD#2003-0599;DSL,concurrence letter dated March 15,2004).A wetland delineation report for the adjacent Fanno Pointe Condominiums site to the south,where a portion of the Wall Street right-of-way is located and where partial wetland mitigation is proposed to occur,was prepared by IRhea Environmental Consultants in August 2002(DSL WD#2003-0024;DSL concurrence letter dated June 2,2003). All delineated streams and wetlands are shown on the existing conditions drawings(Sheets 2a and 2b) included with this application. IDescribe the existing physical and biological character of the wetland/waterway site by area and type of resource. e. (use separate sheets and photos,if necessary). IFanno Creek, Pinebrook Creek(tributary to Fanno Creek), associated wetlands,and two man-made on-line ponds are located in the project area. The stream banks along Fanno Creek are approximately 8 feet high,steeply sloped, and covered with !ense Himalayan blackberry in much of the project site. The riparian corridor along Fanno Creek contains Oregon ash, red 1 • alder,ornamental hawthorn,Himalayan blackberry, rose,Pacific ninebark and willow. Hydrology and water quality of Fanno Creek have been adversely affected in this reach due to past development,straightening and shortening of the stream Ichannel resulting in scour and stream bank erosion, and alteration of the confluences of Pinebrook Creek and Red Rock Creek with Fanno Creek due to sewer construction and construction of on-line ponds.Pinebrook Creek has also been extensively modified from its historic condition, and wetlands associated with Pinebrook Creek are dominated by invasive and noxious species including reed canarygrass, bittersweet nightshade,Himalayan blackberry and purple loosestrife. Existing site conditions are described in more detail in Attachment C. Resource Replacement Mitigation. • IDescribe measures to be taken to replace unavoidably impacted wetland resources. . Proposed stream and wetland mitigation to compensate for 0.30 acre of proposed wetland fill consists of a combination of Istream channel and wetland creation(0.08 acre; 0.053 acre mitigation credit at 1.5:1);wetland enhancement(0.29 acre; ' 0.097 acre mitigation credit), and wetland restoration(0.20 acre; 0.20 acre mitigation credit at 1:1). Due to the redesign of Phase 1 of the project,the wetland mitigation plan has been revised slightly. The revised wetland mitigation areas are shown Ion Sheet 10 of the wetland permit application. The wetland mitigation data form.is included in Attachment D.The revised wetland mitigation plan is included in Attachment E. _. I . I . I . I . City of Tigard Wall Street Extension—Permit Modification, November 2005 ' Joint Permit Application List of Figures &Attachments 1 FIGURES Sheet 1. Site Location Map Sheets 2a& 2b. Existing Conditions Sheets 3a& 3b. Proposed Wall Street Site Plan Sheets 4a&.4b. Proposed Wetland Impacts Sheet 5. Wall Street Typical Section Sheets 6a—6f. Wall Street Plan and Profile Views Sheet 7. Bridge Plan &Elevation Views Sheet 8. Bridge Typical Deck Section& Wingwall Detail Sheet 9. Stormwater Quality Facility Plan and Profile Views Sheet 10. Wetland Mitigation Plan I Sheet 11. Proposed Wetland Impact Area Cross-Sections Sheet 12. Fanno Pointe Access Road Culvert Location Sheet 13. Fanno Pointe Access Road Culvert Design ' ATTACHMENTS , Attachment A. Property Owners Attachment B. Project Purpose & Description Attachment C. Physical and Biological Character of the Wetland/Waterway Site • Attachment D. Wetland Mitigation Data Form Attachment E. Wetland Mitigation Plan • •r 1 • I � o r:;;F c i, • 7I Cr $[:I.- 6 SD1 n BS � r. pi'' >. °. , +" #<#1�111IC33j•• �• ✓, - f ' a ' . ::$: !7 ...r~ YV g W\PLELEAF ST y I �r r. al• 5 : ;:L , •sa .‘1,/,.. '4• . -J a„ woo 0 )500 7000 • W ,' II // 4 � ` `Li S}lAI}Y 1�- SP'UJ�CJJE �> 1 11 Po. Ili a'• ,.i A. 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I'll 1' \ \ • ':' Float:Arlin k . : . • ' / . • WETLAND IMPACT \ .\ .. • ,- , . r • • . .. 7 • \ \ . • . . . , .. . . . .. .... . .1.. ,_ . .....e......a. A • • WALL STREET EXTENSION (PH_ 1) • VW'. . • =SO.VII .,...4...N. . • 2, DE ELAM ......m.,O...Mao APPLICANT: City of Tigard . ....... . • ....., •• tsociates, Inc. 7404,0 Sir 11. • C....0•11•4■.••2 ille,ra ...._, . =CM GII-acro .,;titIRJCi STREET it, UTILITIES IMPROVEMENTS .... - .• Vannie Nguyen,Engineering Manager • 5/.2C SCALE KS IMO= \,......1,7. 41....." - COY OF TIGARD • , Alicusz 2005 1 .oz 022/to 1.21101XMC 013WEINEKT X • • . . WATERWAY:Pinebrook Creek&wetlands • • . . , . . . • ACTIVITY:Wall Street,permit modiflaition - , • • • . . • . . . 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X VannieNguyen,EngineeringManager. .s `°°�°`'°d"°"�'°' `"I°j'�''' STREET 8 UTILITIES IMPROVEMENTS (.b., � Cfl OF TIGARD z OF WATERWAY:Pinebrook Creek&wetlands zs ffs. \,.::\"--. �`i qtr MARCH,, 2006 I17F- 0Z629.7 T8 [ra+ffrtncnE>•�awWT X ACTIVITY:Wall Street,permitmodificatiou 1 DATE:November 2005;SHEET:la of 13 . • • • • aw robe V — Cbr oaf rat. , Orr oaf ore Ook aa.ac. • — as nett QAr MA-1.0.0. RJ77 RfN o Map AM . •-0• egwaa art[v wars .re .00.00.0.10 over (REVISED SECTIONS) os— --t- -S— I�I 46.— Ix=Or0AV 6/23/04 7` 1 "• ---- `--t ..Wbva.e.P Pa II =Moe K/ ear /ro•. 1 7trn Lwr !rove/ gake -+�∎�-ix..4 tee.(sfi.w.r4•PID Corr / Lane Loee Conn 1 Lox _—. --Dana font aw �- �—Oa"s..w.r:wP $7 2R ! t �_ •-�`-�• 2.5X 2SX atanc JunkOwtr `` ♦ Wei--a4a-a�,G ,- 0 0 -.worms ;y; 4Q T.Ma CO. 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P ^0 �� b L+- ° E/. 14892 .%'. ill '{' iv t•`'' ; E1. /4'4.82, o tp b ' ' - ._ +' N87'a07+'ssr .4 O p,„.-s VI 0 I I 4 , -—717— \ I !I • . , fie :13 ?.. . .- . Y o o a roodra •' O. q.- . , t ki S/d 20=4'Grid9e lyp. ea side• w, v • yR er�d pale/ea-e+rid- - this old P LAN . 1 60' • l ,, / 1 a,/2 CZ Ben/ 3 1 ten/4 . a Beni S . - .z s6-O pedeslrioo rail ea side ..I - Pedeslrio'i roil on . sidewalk mocn/ed -160 cancrele parapet - ■v'-150 . —, -S. :140 laWfailaillIgtitsin o-130 - ' 0 r - • PP/6ro.J75 steel &is/irf9 9roc,rid • j•/20 p+Pe pit. lyp a roadway a r. u`• 110 Remove berm /00 yr. flood -100 £s/. lip£l. 650, /yp.. E1. 141.1 ELEVAT!G N . . APPLICANT: City of Tigard Bridge Plan & Elevation Views Vannie Nguyen,Engineering Manager - - WATERWAY:Pinebrook Creek&wetlands ACTIVITY:Wall Street,permit modification . DATE:November 2005;SHEET:7- of I3 CL roodway . 57 o'out-out I /-O 6-0' 36=0' 6-0- . 1-0- roil I s/w Peoesfric»roil on roadway s/w roil [[ sidewalk moulted 12-Z--6"x4--0-precast } concrete percpet I prestressed concrete • i 'slobs, fyp . 1 - 2'non: .4CWS �. Sf • .,s 2% I S/ 2% O _ 5-4 .10- 0 • •� w •- •.*-4 • � y_ - �r7 -Fp1 6x°.0 3 T5 r� i-� r � r� r1 r -I r-1 - li I I -�L i • !I steel pipe I II p•le i TYPICAL DECK SECTION . Pedestrian roil on • sidewalk mocnled CC bent - concrete po-cpel \ . _11,.111 IJJI{IIIiiiiU iiIlIIIIIIIIllIfflhIIII. Frac/co-ed/iSidewalk I finish 2-6_ slob // //\l/ made /`\ )� - Bridge Typical. Deck Section & Wingwall Detail - //�// j ,. - Wingwall APPLICANT: City of Tigard • Vannie Nguyen,Engineering Manager �� - ; WATERWAY:Pinebrook Creek&wetlands ACTIVITY:Wall Street,permit mod'deatiou WINGWALL DETAIL DATE:November 2005;SHEET:48 of 13 OM MI IIMII IIIIIII NM MI 11111111 NM OM •all OM MN MN IIIIII MIN MN NM 'MIII ....... . . 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Min. 146 3 146 — . o..4 - —- 4:T- ---- -------:.:----- - .1 t i 1 i 142 . 6. 1 • --- Section A-A 138 I ___.—_______:.--—---'--'-/-1 : Jli___i ...---- ..- S a005 SL= 0.p030 .91_-, 0.0030 I.= 0 ' • 134 ...-- ...- .1 ‘rx ,.. 04 . _0, 03 0 130 . 2+14.00 CA. g +r, • • , wate Ouofity MR 130 ' i • IE IN= 1 35.86 IE 0 t= 13,r PRO'L7LE . . s'''''7717;1°2: - . I • 44 BO 4+4Q 4+20 3+90 3440 3+00 2+60 2+20 J1.30 1+40 1.Q3 -- • .. A • • -I- '" ' (03 ,2/3VIII.T ._ SHEET s.a. f.... SW WALL ST. x 11" '.3444. ___u_,.. DE HAAS 900 SX.0:0000e Gel. . APPLICANT: City of Tigard ,•:. ... t• 0.. r• a.a.ia - Vannie Nguyen,Engineering Manaker ,•••: ....• tsociates, Inc. J.412A.Ti STREET 8. UTILITIES IMPROVEMENTS x E21 OF Ore OF TIGARD . PLAN S. PROFILE .0t 102-0301 x . WATERWAY:Pinebrook Creek&wetlands .... C. ' alonvenc DE0.000,34 • ACTIVITY:wall Street,permit Mot:Manion . 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WALL STREET EXTENSION+ (PH. 1) • -: APPLICANT: City d • ••.E,.1%1 trsociates, Inc_ • . , -,A, . • c..........ono.II Ara,. STFtEET 8. UTILITIES IMPROVEMENTS • • Vannie Nguyen,Engineering Man-ager . -....0.7 -4.1,. ..._4 or . - .--' . - - . . 'L2EraIae CITY OF TIGARD . X • I 041629.118 040.4.474 OPAIMENT Mt= . - WATERWAY:Pinebrook Creek&wetlands . • . • . . • • _ • • . ACTIVITY:Walt Street,permit modification • .• . • . .•. . . . • . • .. . . . . . • • . . • • DATE:November 2005:-SHEET:JO of L.3 - • . . • . . • • • •. ... . . . • . • • . • . • • • . . • .. . . • . . . -• . • . . . . . • . . • ' • .: , , IIIIII • NM = 111111 1111111 OM IIIII IIIIII MM. • IMO MI' woo Ilas.' gm we we' me Wetland Wetland 12 150 150 12 50 —--— r 50 140 j 1401 140 120 1U0 . 80 0 40 20 Q �0 40 t40 8o ibo 120 o/! Street t I Wetland l 12 150 `� , 150 12 . 140 Orrgino/ amine( ' 140 • - 140. 120 100 80' 60 40 20 Q 20 40 60 80 100 120 • Scale 1 40' :Proposed . let/and /mpact.: Area Cross--Section APPLICANT: (Sty of Tigard Vannie Nguyen,Engineering Manager WATERWAY:Pinebrook Creek&wetlands ACTIVITY:Wall Street,permit modification DATE:November 2005;SIi&I:11 of 13 • ' -ye, ,'1 1 ..^' "---._'.. QQ — . — _.:,,,,,.. 1011 • .........- -------- 1.---- - 'la - -_--;•. , ......„ - , . . • •\,, / r S" ' . •-..._____ Zse.4 1 7. .. 2,•■ \�i ,1\� -i,Fi3 '\ ♦ - �• _ .x.15 d I 1. 1.* +�• \ Y g :\- -746 '` \ ♦ �, o° �� '' %'��. .♦5 r- �y _ � .• 0, 1411,4040...... .41,14,0 4, ... __......, ,...,. 2 (-------.=.2N • �.• ©-+:,�` 'N. V\, 1 ! 1iT1.. ` /\ 0 � PTV � t •, ! I \ See sheets R6-and R7\ 06"�� 0. 5 s...- 1:Jo- ,..--. I�_ for typical details-, — o ',1"..z-78-5;1?.- f ►fir ey. Nis�7 zs�a r / ••.i .t - � -•• • 1 8 o g o Roo9n graa,ng CA-(wot7e grade) I I J I aiya..i grow,. - 145 ,� -N n'-- o n I WoA mmg 2�, TS `d° e. c 145 n o g O IIIIIMIlrilill n C _ 0.9263 ,� _-- F __ ���.-- + 111n 140 — - S �ier�-'- 140 5+04,00 42 - GIP S -0.000 =b_b ri - `51=0 0208'-- - I 135 IE* 139.50 X0303- -- S,ed vad •� Yr 135 3+65.75 .....re(,yr. 1E= 1S9.50 i 1 130 _ I PROS 2£T y p , - v/ar. r.wir_ •- Sc - .. 125 I r+. 1.1. pp i - n m .7J - h N N h n o .n 22 J N cm n,o ,!f- N 8 ,i 8 r N O 123_ P: ,: ' ,0 ,l1 f II Y = ' O O O o. of o, ai I a, m g 2-513 - 3+00 +20 .. 3+40 3+60 3+80 4+00 - 4+20 4+40 4.69 4..80 s+00 ' 5430 SCHEDULE G APPLICANT: Ci of Tigard• c. c DE HAAS ai..a�w SHEET MO ty w e� " ' - •.....� WALL STREET EXTENSION (PH. 1) RS Vannie Nguyen,Engineering Manager--• .ro ' - c °;`rte: . i l ;«. «*- :% { STREET 8 UTILITIES IMPROVEMENTS c;«�, WATERWAY:Pinebrook Creek&wetlands a u+a,e ,,,,, Amt zoos' ,� lj2629.1/B comma a q , , - OF 34 ACTIVITY:wail street,permit modification Fanno Pointe Access Road Culvert Location DATE:November 2005,SHEEi':1 a of/3 • IIM MI =II 11•11 NMI • SIM • M N NM N NM NM NM r N NM E �■ I NM I •� r A. „or/too n+Ga CepJA II . ��':{� .mil �_ H �= 7017:rep MOOT SW or even enot � { 1_ dfat 1'aiCl i! part j" ==-I .L..4 'i l 'y'° f/L s-l7", ,7-IMP 40 f - •d :. ��_) ----ft i r' • -= J' r, 41 ✓m,,, 6.--0", ' -^r. _ v f �' �r- r •1< —c:: •s--- = -.1...) Flo!► `' �% ' -• H `. } `: .-_.•. .<.......- i ' 7"L.. i .4.......1.-' •`-'7" r _ ,.11 4 ;-• i---7 x.--2--'- Rip-Rap End Slope Detail • Ede Obe eras Hall Blvd. Culvert- Outlet Rip-Rap sue• Js s•-o- JA. j(— 1 Shwa"ab.roto -' '; Relti6v MO Stream flawfait Jg' —:. ;�•- Flow f ♦.0' Roayl,ytpy�(,/L i -� ° N'�.` i:1?- i L+..i'.-. •-33.t•4-..4�-e _„max,^,•" 7 i�.2'Ow. V!' ..� =Yeti?:fi i r✓1 SW Rwg1 grad.44 } JA'We. JQJ&O f 173' 173' I 7Ip /z- I Lnnwo i ns K' 1.0•Kn. busy/J00 sr r'�s �p-R/4 p(ao ow SW; `�0x 6 irm-R(0007"Sid) 6.•a Fenno Point Culvert Section H=H Sear 1".. 6=0- . 1 SCKMDUL E 0 oa I o< ! I .. I ew. ,7/J,/bs DE HAAS. too SJp1..'a.`—.�"Gag SHEET 140 j°°� "�" °�`°""�° WALL STREET EXTENSION (PH. 1) R9 APPLICANT: City of Tigard. W ., v ,'i ssociates. Inc. Vanniel�iguyen,Engineering vfanager - `_ ' ' •,._,_a ,.,a i�"E��A STREET & UTILITIES IMPROVEMENTS 29 �=� WATERWAY:Pinebrook Creek&wetlands see.,re_ '"a0� ,,,e Ausr.:t zoos I, oZCZ911e , '' OF 34 ACTIVITY:Wall Street,permit modification Fanno Pointe Access Road Culvert - DATE:November 2005;MILL 1:13 of 13 1 • 1 0 . CITY OF TIGARD WALL STREET EXTENSION JOINT PERMIT APPLICATION ATTACHMENT A:PROPERTY OWNERS 2S 1 01 800, 1100, 1200 Fred Fields 1149 SW Davenport Portland,Oregon 97201 2S 1 01 1201, 1202 The COE Manufacturing Company P.O. Box 520 ' • Painesville,Ohio 44077. 2S 1 02DD 100, 200 � City of Tigard 13125 SW Hall Boulevard Tigard, Oregon 97223 2S 1 02DD 300 Fanno Pointe,LLC 1 109E 13th Street Vancouver, Washington 97660 1. 2S 1 02DD 90000 . Fanno Pointe Condominiums ' Jennifer Cosenza,Homeowners Association President 13712 SW Hall Blvd. Tigard,Oregon 97223 k 1 1 1 • 1 CITY OF TIGARD WALL STREET EXTENSION JOINT PERMIT APPLICATION ' ATTACHMENT B: PROPOSED PROJECT PURPOSE&DESCRIPTION. Permit Modification,Revised November 2005 . ' Project Purpose and Need • The.purpose of the proposed Wall Street extension is to carry out the requirements of the Tigard Transportation System Plan(TSP)which has been acknowledged by LCDC and - approved by ODOT and Metro. The connection between Hall Boulevard and Hunziker Street via the extension of Wall Street is identified in the TSP as a needed system . - improvement. The TSP is the legally established plan for streets within the city; and it therefore confines the choices available to the city in the completion of its streets system. The Wall Street extension is one of the projects determined by the TSP to be.significant. ' It is one of only four locations'where anticipated connectivity/circulation projects were determined to be primary and significant. The TSP identifies the Wall Street connection as a needed connection, one that is necessary to allow east-west circulation within the • city and the region. . Completion of this connection is a critical element of the Tigard TSP;a part of the City's • Comprehensive Plan. Tigard is obligated to follow the requirements of the TSP as the city develops.. ORS 197.712(2)(e), OAR 660-012-0015, 660-012-0045. ' Substitute projects are not included in the TSP, and as a practical p J p matter,there are no alternatives that would be functional substitutes for the Wall Street extension. The ' purpose of the project is, therefore, to provide transportation connectivity and circulation at the location where it has been determined to be necessary by the city and regional planning processes. The need for the connection has been established by the public planning process which • led to adoption and acknowledgment of the TSP. Currently, there is no east-west Iconnection between Hall Boulevard and 72nd Avenue between Hunziker Street and. Bonita Road. The lack of a connection results in not only congestion on the east-west streets,but also excessive traffic and congestion on Hall Boulevard and the Mall/99W. Iintersection. The addition of the Wall Street extension will reduce traffic on the existing east-west routes, as well as on Flail Boulevard. The primary goal of the proposed Wail Street extension is to provide a needed additional east-west connection in the eastern part of Tigard as required by the TSP. A secondary goal of the project is to provide access to 26 acres of industrially-zoned land located east of Fanno Creek and west of the railroad tracks. This area currently lacks access. Because Tigard has limited undeveloped industrially zoned land,'providing I access to the area is vital to Meet Tigard's targets for allowing industrial development and meeting employment targets. The project would also improve access to an additional 38 acres of industrially-zoned'land east of the tracks and west of Hunziker Street.• ' Wall Street Joint Permit Application Attachment 13 Page 1 of 5 I Another secondary goal is to provide access to the Tigard Library and to the Fanno Pointe Condominiums that is not directly off Hall Boulevard to satisfy ODOT spacing , requirements and improve road safety. Hall Boulevard is an ODOT facility and ODOT -' has permitted the Tigard library and Fanno Pointe Condominiums to construct temporary entrances off of Hall Boulevard,with a requirement to remove the temporary entrances once permanent access from the extended Wall.Street is available. Project Description I ' The project is located south of Highway 99W,west of Highway 217, and east of SW Hall Boulevard in Tigard, Oregon at approximately river mile 3.0 of Fanno Creek(Sheet 1). Pinebrook Creek,associated wetlands, two man-made ponds, and.Fanno Creek,are located in the project area(Sheets 2a& 2b). The City of Tigard is proposing to construct the Wall Street extension between.SW Hall Boulevard and SW Hunziker Street. The project will involve construction of approximately 1,500 feet of new roadway extending northeast of SW Hall Boulevard and crossing Fanno Creek and the Southern Pacific, railroad tracks to connect with, and widen, an existing.approximately 1,600 linear foot,2- . lane paved section of Wall Street(Sheets 3a°& 3b). The Wall Street project will include a ' 320 foot bridge spanning Fanno Creek and its floodway.The City has applied to the Oregon Department of Transportation for permission to construct a signalized intersection to cross the railroad tracks. I The Wall Street project is proposed to be constructed in two phases. The wetland permit application includes proposed impacts associated with construction of the entire project, . I • Phase 1 includes construction of the western 360 feet of Wall Street, beginning.at SW Hall Boulevard and ending west of the East Pond (Sheet 3a). This phase will involve impacts to Pinebrook Creek and associated wetlands and minor impacts to a man-made ' pond(the West Pond). Phase 2 includes construction of the remainder of Wall Street to Hunziker Street(Sheets 3'a& 3b). This phase will involve additional minor wetland impacts to a second man-made pond(the Cast Pond) and wetlands:located east of Farino , Creek. Proposed wetland impacts for Phases 1 and 2 are shown on Sheet 4a. The basic design of Wall Street includes a 48 foot,wide paved roadway (two lift travel lanes; a 1.4ft. median, and two 6ft. bike lanes). The street will have.curbs, 5 foot wide planters,'and 6 foot wide sidewalks on each side. Right-of-way(ROW)width will be 72 feet along with additional widths of up to 20 feet outside the ROW to accommodate.8 foot.wide ' public utility easements and cut and fill slopes. A typical section of Wall Street is shown on Sheet 5, and plan and profile views for the entire alignment are shown on Sheets 6a through 6f. The roadway will be constructed with fills up to 8 feet and cuts up to 3 feet. The highest fills occur at the bridge approaches and are a function of the required elevation of the bridge structure crossing Fanno Creek. . I A 320 foot bridge over Fanno Creek will span both the creek and its floodway. Bridge details are shown on Sheets 7 & 8. At the bridge crossing, the paved width will be reduced to 36 feet(two 12R. travel lanes and two 6it, bike lanes)with curbs, sidewalks and handrails • for a total right-of-way width of 50 feet. The bridge will be constructed in four 80 foot sections using precast prestressed concrete slabs supported by three rows of eight 16-inch Wall Street Joint Permit Application Attachment B- . • Page 2 of 5 ' i • diameter steel pipe piles at the junction:of each of the sections.The piles will be located outside the stream channel and delineated wetland areas, Since the bridge approach will be ' constructed on top of up to 8 feet of fill, the elevation of the bridge deck will be located approximately 8 feet above the ground level adjacent to the top of bank of Fanno Creek. Wildlife movement will be possible underneath the bridge deck along Fanno Creek, Stormwater runoff from the new impervious surfaces associated with the Wall Street project ' will be captured in storm drains located in the roadway and will be treated in two water. ' quality facilities (treatment bioswales), Runoff will be pre-treated in water quality manholes (sumped oil/water separator) prior to entering the bioswales. These water quality manholes 1 will provide heavy sediment and floatable contaminant removal prior to treatment in the bioswales. Runoff from Phase 1 of the project will be treated in the water quality facility,that has been constructed on the Tigard Library site;The library bioswale was sized to treat runoff from the library as well as Phase 1 of the Wall Street project. CWS' Design and Construction Standards Resolution and Order#03-11, effective April 25, 2003 were utilized with a water quality loading event of 0.36 inches of precipitation falling in 4 hours with a storm return period of 96 hours,. an mandated by Oregon Revised Statute 340-41-455(3)(e), The performance of the water quality sumped manhole and bioswale combination was designed I in accordance with the CWS model for 65%phosphorus removal-from 100% of the newly constructed impervious surfaces as per Tualatin Basin TMDL requirements under OAR ' 340-41-455, The 65% total phosphorus removal model correlates to 85% total sediment removal efficiency. A new bioswale will be constructed east of Fanno Creek to treat runoff from Phase 2"of the Wall Street project. The Phase 2 bioswale was sized to accept the impervious surfaces from the Wall Street roadway and sidewalks created by Phase 2 of the project (4.6 acres). The Phase 2 bioswale was designed by the project engineer, DeHaas and Associates, in accordance with the NOAA Fisheries Habitat Conservation Division's stormwater guidance . (2003). The NOAA Fisheries 6-month, 24-hour storm event (approximated by 2/3rd the ' runoff produced by the 2-year, .24-hour storm of 2.50 inches) utilized the Santa Barbara Urban Hydrograph technique. This represents treattrnbnt of 90-95%of all annual runoff with a resulting water quality discharge of 1.22 cfs. The NOAA Fisheries criteria exceed the CWS requirements of a total precipitation of 0.36 inches falling in 4 hours with a storm return period of 96 hours. The performance of the water quality sumped manhole`and bioswale combination was modeled after the CWS model for 65%phosphorus removal. The ' trapezoidal bioswale will be 168 feet long, with a 6 foot bottom width, maximum treatment depth of 0.5 feet,4:1 sloped banks, and a channel slope of 0.5%. This results in a minimum residency time of 9.0 minutes with a maximum flow of 1.22 cfs and a discharge velocity of . ' 0.31 fps. Bioswale outfalls will be constructed in wetlands adjacent to,Pinebrook or Fanno Creek,and ' water velocity will be diffused by riprap pads. The outfall from the Phase 1/Tigard Library water quality facility was recently constructed (DSL #30238-RE, Corps #2003-00241) and currently outfalls to Pinebrook Creek in an area proposed to be impacted by the Wall Street ' Wall Street Joint Permit Application Attachment B - Page 3 of 5 . 1 project;therefore,this outfall is proposed to be relocated east of its existing location and will outfall into the East Pond which is proposed to be reconfigured into wetland as part of proposed wetland mitigation for the project. The outfall at the downstream end of the Phase 2 bioswale will be located at the edge of a wetland located in the floodplain above the top of bank of Fanno Creek. The wetland is hydrologically connected to Fanno Creek in an area located south of the bioswale. Modeled bioswale discharge from the 6-month, 24-hour design storm is 1.22 cfs with a velocity of 0.31 fps. Bioswale discharge will be further dissipated by outfalling to a 6 foot by 8 foot by 1.5 foot thick rock pad of ODOT class 50 substrate planted with willows positioned at the edge of an elevated Fanno Creek wetland. By discharging the treated stormwater to a wetland area rather than directly to the stream, a .. further reduction of potential erosive flow forces is attenuated prior to entering Fanno Creek. ;, Flows greater than the 25-year design storm event will be conveyed through a 27-inch diameter high-flow overflow pipe that discharges at a velocity of 9.5 fps into a 7 foot by 12 foot by 2.5 foot thick riprap pad using ODOT class 200 substrate positioned at the 1 uppermost eastern edge of the wetland. Willows will be planted throughout the riprap mattress for temperature mitigation. Sheet. 9 provides details of the Phase 2 bioswale, outfall,conveyance system,and overflow outfall. I A total of 0.30 acre of wetland fill is proposed for the entire project (Sheet 4a). Wetland impacts for Phase 1 include 0.11 acre to construct the roadway and fill slopes for the first 360 feet of the project. Wetland impacts for Phase 2 include 0.19 acre to construct the westerly bridge wingwall and the roadway and fill slopes for the remainder of the project. Proposed wetland impacts are mainly to Pinebrook Creek and associated emergent/scrub- shrub wetlands which are heavily invaded by invasive species. Minor wetland impacts are proposed to the West Pond, East Pond, and wetlands east of Fanno Creek located above the top of slope adjacent to Fanno Creek. Impacts to Pinebrook' Creek are included in the I wetland impact calculations. The section of Pinebrook Creek located in the impact area is . not a well-defined channel, instead it consists of two to three approximately 6 inch wide . shallow channels that flow through an associated reed canarygrass-dominated wetland. The top of stream bank could not be delineated in the field; therefore, the stream impact area . could not be separated from the wetland impact area. The project will result in the loss of approximately 270 linear feet of Pinebrook Creek stream channel, and.we estimate that the ' area of stream channel to be impacted is approximately 270 to 400 square feet. Fill activities in Pinebrook Creek will be..conducted during the ODFW in-water work window of June 1 through September 30. V' Proposed stream and wetland mitigation consists of a combination of stream channel and wetland creation, wetland enhancement, and wetland restoration (Sheet 10). The Pinebrook Creek stream channel and adjacent wetlands will be reconstructed slightly.south of their existing location and Pinebrook Creek will be reconnected.to Fanno- Creek via a historic stream channel located on the Fanno Pointe Condominiums site. The two man-made ponds ; will be taken off-line from Pinebrook Creek and will be reconfigured and enhanced as 1 stream-associated wetland areas. The remainder. of the project wetland impacts will be . mitigated for by removing the upland berm along the south edge of the East Pond to restore' .. I historic wetlands. Wall Street Joint Permit Application Attachment B Page 4 of 5 I I 1 • • Wetland mitigation activities will require 0.28 acre of temporary wetland impact due to • removal in existing wetlands. These impacts will include 0.08 acre in the proposed wetland enhancement area in order to reconstruct Pinebrook Creek and associated wetlands. - Additional temporary wetland impacts will:also be necessary in order to lower the existing elevations in three wetland areas in order to connect the berm removal/wetland restoration ' area with existing wetlands to the south on the Fanno Pointe site. These three wetland areas to be temporarily impacted include: the East Pond at its the south side (0.02 acre), a small existing drainage south of the East Pond (0.02) and existing wetlands on the Fanno Pointe ' site (0.13 acre). Finally, excavation of the new Pinebrook Creek stream channel on the Fanno Pointe site will result in 0:03 acre of temporary impact to existing wetlands. All - ' temporarily impacted wetland areas will be seeded and planted upon completion of grading according to the mitigation plan. Approximately 550 linear feet of new stream channel will be reconstructed to mitigate for the approximately 270 linear feet of Pinebrook Creek to be impacted. From the location where the existing Pinebrook Creek enters the site from under Hall Boulevard,the stream is currently culverted twice in culv'erts not designed for fish passage for a total length of approximately 170 feet. The reconfigured Pinebrook Creek will only be culverted once under the Fanno Pointe access road for a distance of 65 feet(Sheet 12). This culvert will be a 42 inch diameter CMP with a flat grade and will be buried 6 inches and have natural substrate (Sheet 13). More details regarding stream and wetland mitigation are included in the wetland mitigation plan included in Attachment D. . . A Biological Assessment was prepared to evaluate potential project-related impacts on • g pP p 1? 3 p federally listed or candidate fish, wildlife and plant species that may occur in the project t area. The primary reason for preparation of the BA is. the potential for listed Upper Willamette River winter steelhead to be present in Fanno Creek. The effects of the project activities on listed fish and aquatic habitat were evaluated under the programmatic • Biological Opinion issued by NOAA Fisheries (2002)-Standard Local Operating Procedures for Endangered Species (SLOPES) for Certain Activities Requiring Department of the Army Permits in Oregon and the North Shore of the Columbia River. The proposed project ' activities were modified to meet all applicable terms and conditions of SLOPES that apply to this project, including general construction, road'Crossings, and stormwater management thereby preventing potential project impacts from negatively affecting listed fish species. A ' summary of SLOPES terms and conditions and proposed project actions to meet the SLOPES criteria was included in Appendix D of the Biological Assessment. The Biological Assessment was previously submitted to the Corps of Engineers, who determined that Iconsultation with USFWS and/or NOAA Fisheries was not required for this project. • 1 ' Wall Street Joint Permit Application Attachment B Page 5 of 5 1 • i ® CITY OF TIGARD WALL STREET EXTENSION JOINT PERMIT APPLICATION ATTACHMENT C:PHYSICAL AND BIOLOGICAL CHARACTER OF THE. WETLAND/WATERWAY SITE 111 •• The western third of the proposed Wall Street alignment crosses Pinebrook Creek and its associated emergent/scrub-shrub wetlands,two man-made ponds on-line with,Pinebrook • Creek, and Fanno Creek and its floodplain.Two projects are currently being constructed adjacent to the western portion of the Wall Street project area just east of SW Hall Boulevard and include the Tigard Library north of the project area and the Fanno Pointe Condominiums south of the project area. The.eastern'two thirds of the proposed alignment consists of mowed fields dominated by upland pasture grasses including tall fescue, bentgrass and sweet vernalgrass with scattered forbs including spotted cats-ear,Queen Anne's lace,oxeye daisy,English plantain,clover,and wood.sorrel. The field edge above the floodplain of Fanno Creek is a narrow,moderately sloped woodland with Douglas fir, • Oregon white oak,big leaf maple and Oregon ash in the canopy and snowberry, beaked II hazelnut,Indian plum, rose,ornamental hawthorn and Himalayan blackberry in the shrub understory. Scattered sword fern and fringecup are also present. . r Fanno Creek flows southeast through the west portion of the project site.The stream banks along this reach of Fanno Creek are approximately 8 feet high and are steeply sloped and ' incised..Banks are nearly vertical and covered with dense Himalayan blackberry in many areas. Sections of Fanno Creek are shaded by native shrubs and trees, including red-osier dogwood,Pacific ninebark,willow,Douglas fir, Oregon white oak, Oregon ash and red alder. Upland trees present near Fanno Creek include Douglas fir and Oregon white oak. Fanno Creek is dominated by glides and pools in the project area with less than 5%riffles. Stream substrate is dominated by fines and silt,with bank material dominated by native soil 1 and clay.Bank erosion is noticeable with observable evidence of recent channel scour. Water quality in Fanno Creek is currently managed under the Tualatin Basin TMDL progitrii,bu renains mfor em erature;dissolved"ox ygen O)��hos horus and .1 bacteria(Jan Miller,CWS personal communication, September 5,2003).The hydrology of the system at the project site is very flashy with pronounced effects observed during a recent _ rainfall event..During the September 6 through 8,2003 rain event,approximately 1.05 1 inches of rain fell over a 32 hour period of time,during which time discharge at Durham road went from approximately 5 cfs to 160 cfs. . Pinebrook Creek has been extensively modified y mod d fr m o its historio condition and currently flows easterly through the site to its confluence with Fanno Creek. The stream flows through a series of pipes and is associated with two man-made ponds that adversely affect the ' downstream water quality of Fanno Creek. The original outfall of Pinebrook Creek onto the project site was from a.115 foot long 18 inch concrete culvert.under Hall Boulevard.This culvert'has been replaced with a 118.5 foot long, 57 inch wide by 38 inch high arch culvert • with natural substrate to meet fish passage requirements as part of the Hall Boulevard . widening project that is currently under construction. Hall Street was recently widened approximately 13 to 15 feet east of the existing edge of pavement within the road right-of- ' way for a distance of approximately 1,000 feet,which was a City and ODOT`approval requirement for the Fanno Pointe Condominiums and Tigard Library projects. . Wall Street Joint Permit Application Attachment C _. Page 1 of 4 ' Pinebrook Creek is daylighted for approximately 55 feet on the east side of Hall Boulevard before it is culverted around an on-line diversion pond in a 12.inch concrete culvert for i approximately 140 feet.The diversion pond(the West Pond)was constructed in the early 1960s based upon a review of historic;aerial photographs. The pond contains up to 2 feet of ' sediment and has a silty clay bottom. Concrete cylinders form the walls of the pond.at the downstream end. A narrow fringe of emergent wetland vegetation surrounds the pond; vegetation is dominated by reed canarygrass, and other common fringe species include ' purple loosestrife(noxious),common horsetail, and nodding beggar's tick. Only very ' limited shading is provided by a few small trees including curly willow located adjacent to the northeast corner of the pond and an English birch tree located adjacent to the SW corner . of the pond.The pond surface was covered with algae during the August, September,and October 2003 site visits..The shallow diversion pond receives flow from Pinebrook Creek via a 4 inch PVC pipe and outfalls back into Pinebrook Creek in a second approximately 35 foot daylighted section of Pinebrook Creek,that is heavily eroded, located below the pond to ' the east. Below this second daylighted section,Pinebrook Creek is culverted in an 18 inch concrete culvert for approximately 15 feet. Downstream of this culvert,Pinebrook Creek is ' daylighted for approximately 200 feet and flows through an emergent/scrub-shrub wetland area dominated by invasive and noxious species including reed canarygrass,purple loosestrife,bittersweet nightshade,creeping buttercup and Himalayan blackberry and also including scattered native Oregon ash,rose and willow. Pinebrook Creek appears to consist. of two to,three narrow(approximately 6 inch)shallow meandering channels through the reed canarygrass. A maim stream channel is not visible. . The downstream end of Pinebrook Creek flows into a second on-line man-made pond(the - East Pond)located at the top of bank of Fanno Creek. This pond was constructed in the late 1940s or early 1950s based upon a review of historic aerial photographs. The pond appears to have been constructed by pushing up a dirt berm at the downstream end of Pinebrook Creek,just prior to its confluence with Fanno Creek,blocking fish passage. The East Pond is heavily silted in and contains 3 to 4 feet of sediment. A fringe of emergent wetland vegetation surrounds the pond;vegetation is dominated by reed canarygrass, reed. mannagrass,peppermint,and purple loosestrife;other common species include floating Ipennywort,American speedwell,spotted ladysthumb, soft rush,beggar's tick, and small- fruited bulrush.Limited shading is provided by Oregon ash and red alder trees along Fanno Creek on the southeast side of the pond.The pond surface was covered with algae during the IAugust, September and October 2003 site visits. Pinebrook Creek does not provide any navigational, fishing,or recreational.uses. Fanno Creek and adjacent wetlands and riparian areas may provide for passive recreational uses on the project site including activities'such as bird watching.In addition,Fanno Creek may provide recreational uses such as canoeing or fishing, although there are no known canoe access or fishing sites on the project site. The design of the Wall Street project incorporates .. . a 320 foot bridge spanning Fanno Creek to avoid impacts to Fanno Creek;therefore,the . . project should not affect fishing or canoeing uses of Fanno Creek. The.project will result in an increase in noise levels on the site,both during construction and upon completion of . • construction due to noise of vehicles using the roadway,which may reduce wildlife use of . the site as well as recreational uses such as bird watching. However,the Fanno Creek Park is• Wall Street Joint Permit Application Attachment C - Page 2 of 4 i I • I proposed just north of Wall Street and the Tigard library site which will provide for continued passive recreational uses near the project site. A new section of the Fanno Creek Trail is planned for construction on the project site as well as to the south of the project site on the Fanno Pointe Condominiums site and to the north of the project site on the Tigard Library site.Phase 2 of the Wall Street project will incorporate a crossing of Wall Street for the Fanno Creek Trail to provide a connection between the future trail segments to be constructed north and south of the project site. " Tolerant aquatic insects,three-spined stickleback fish and mosquitofish were present in the t West Pond and East Pond during the August 12,2003 site visit by FES aquatic staff. Water temperatures were measured during an overcast morning and it was found that the West 1 Pond(18.0°C)warmed Pinebrook Creek water by 0.5 °C (17,0°C upstream and 17.5°C downstream of West Pond). Pinebrook Creek water temperature entering the East Pond •.. . measured 17.5°C and near the middle of the East Pond water temperature measured 20.0 °C. Water temperature measured 18.0°C in Fanno Creek.Clearly,these two man-made ponds on-line with Pinebrook Creek contribute to thermal pollution in Pinebrook and Fanno . . Creeks: It is apparent that dissolved oxygen.and nutrient inputs negatively impact Fanno and Pinebrook Creeks as a result of the current state of these on-line ponds.Furthermore,the I East Pores outfall to Fanno Creek flows over a highly eroded earthen berm dropping 6 feet • vertically,and cascading another 2 feet to Fanno Creek. The current condition of this eroded outfall blocks fish passage and has a.high future failure potential,which would result in the ' accumulated silt load in the East Pond depositing in and negatively impacting Fanno Creek's at-risk aquatic habitat. Forested and scrub-shrub wetlands are present in the floodplain east of Fanno Creek on the i project site as well as south of the project site on the undeveloped(open space)portion of the Fanno Pointe site. These wetlands contain several native shrub.and tree species including Oregon ash, red alder,willow, red-osier dogwood,Pacific ninebark,and clustered rose,in addition to the invasive s p ecies reed oan '�'a ss and Himalayan blackberry.' Shrub cover is . . 7 ' dense and often greater than 65%. Due to their diversity of vegetation species and structure, these wetlands provide better wildlife habitat values,than the invasive-species dominated wetlands associated with Pinebrook Creek:The road alignment has been located to minimize impacts to wetlands on the east side of Fani%o Creek..Since the roadway will be constructed on top of up to 8 feet of fill at the bridge approaches,the elevation o£the bridge - deck will be located approximately 8 feet above ground level. Wildlife movement will be . possible underneath the bridge deck along Fanno Creek V • A large forested area located southwest of the railroad tracks and southeast of the Fanno. . . Pointe site is mapped as wildlife habitat in the Fanno Creek Watershed Management Plan. The forest consists of a multi-layered mixed deciduous-coniferous canopy with_diverse cover and structure.The canopy provides approximately 60%cover and contains big leaf. - maple, Oregon white oak,Oregon ash, Douglas fir,grand fir, and western red cedar.The diameters of trees range from 6 inches to 30 inches.The shrub understoryprovides V approximately 50%cover and includes.snowberry,beaked hazelnut,.Oregon grape,Indian plum,vine maple,elderberry,serviceberry,English holly and ornamental hawthorn. Groundcover is dominated by large patches of English ivy in the forest edge but also WallVStreet Joint Permit Application Attachment C .. ' Page 3 of 4 I.i • i includes sword fern,oniongrass,Dewey's sedge, inside-out flower,bracken fern and trailing blackberry. Himalayan blackberry is present in the forest edge but is not a dominant ' component of the shrub layer. Snags are common and provide potential nesting sites for cavity nesters;large woody debris is also common and provides refugia for small wildlife species. A second forested area located northeast of the railroad tracks and south of Wall Street is mapped as wildlife habitat by Metro.This forested area does not contain the vegetation ' diversity or structure of the higher quality wildlife habitat patch to the southwest and contains a higher percentage of Himalayan blackberry.The woodland is mostly deciduous with a patch of Douglas fir with an open understory on the north end close to Hunziker Road. Canopy vegetation is dominated by black cottonwood and red alder with smaller • amounts of big leaf maple and Douglas fir. Tree diameters range from approximately 10 inches to 20 inches, The understory is dominated by Himalayan blackberry with scattered ' ornamental hawthorn,beaked hazelnut, and vine maple. Sword fern is present in the understory with large patches of English ivy. Snags and large woody debris are common. ' This forest does not contain either a seasonal or permanent water source and is not . contiguous with the Fanno Creek corridor due to the presence of the railroad tracks along its southern edge. This forest is currently bordered on the north and west by industrially Ideveloped parcels and on the east by residential development. Due to these factors,this forest provides low to moderate wildlife habitat value. i • 0 o IWall Street Joint Permit Application Attachment C . ., Page 4 of 4 .1 CITY OF TIGARD WALL STREET EXTENSION • JOINT PERMIT APPLICATION I • ATTACHMENT D: WETLAND MITIGATION DATA FORM (Permit Modification, Revised November 2005) 1 I ! 1 II • 111 I MI Mr- O O Gai O O O O I• — O O O O O O'.-7',O GO • Mitigation Data Form App#31719-RF App Name: Wall Street, permit modification Resource Coord: Louise Bos •I Date: 11/22/2005 Authorized Impact, Acreage i HGM Class Cowardin Class Mitigation Type Auth.Permanent Impact o.25 I 1 •1 0.04 2 0:01• 3 RI 1 RI 2 RI 3 PEM 1 POW 2 PEM 3 I 1 I -1 I ! i ! !oI I _ Mil Creation 0.08 1 2 3 RI 1 2 3 PEM 1 2 3 Mit. Enhancement 0.29 1 2 i 3 RI 1 2 3 PFO/p35 — FO/ 5 _1 2 3 Mit. Protection 0.20 1 2 3 RI 1 2 3 PFO ipz 1 2 - 3 Mit Restoration 1 2 ? 3 1 2 3 1 2 3 Mit. Barak Credits I PTP credits' I ' Bank Name ! Note: Be sure that acreage, HGM,and Cowardin class boxes correspond,i.e., if acreage is 0051/,then you are reporting that this relates to RFT 1/in the HGM class,and PFO 1/in Cowardin class. If you have more than 3 of any impactor mitigation type,use the back of this sheet and write OVER on this side. Protection Type Bonding Type Bond Amount ❑ None ® None Required $ - [' Conservation Easement ❑ Surety Bond ❑ Restrictive Covenant in Deed ❑ Letter of Credit • Ave. Buffer Width ® Deed Restriction ❑ Assignment of CD ft - • ❑ Other Monitoring - - Years (3 or 5): 5 Report Due: Nov: 2007 As-Built Due: Winter 2006 Mitigation Site Location (Only if different from impact site. Add pages foradditional sites.) Site Number (if applicable): _Name (if applicable): - Waterbody(on or adjacent): - City (if in city limits): _ County(required): Tax Lot (if applicable): TRSQQ: . Mitigation Project Number(For Data Entry Oh. ly): . G_12003■03071_Tig\Permit12005 permit revisionslmift=project form.doc 1 CITY OF TIGARD WALL STREET EXTENSION JOINT.PERMIT APPLICATION 1 ATTACHMENT E: WETLAND MITIGATION PLAN 1 (Permit Modification,.Revised November 2005) 1 1 1 1 1 1 1 • I t . iCi`,•TH1\''t NI �,n t,/;'yr .,J 1:1N),,,,'• ' `µ`7s rf ` i i,r, t r \--:-. ., r' ,c:. 1 fk':r : a ::•.. : ENVIRONMENTAL CONSULTANTS i I 1 I . i City of Tigard 1 Y 9 d 1, I Wall Street Extension I I Compensatory Wetland Mitigation Plan I - i t 1 Prepared for: Vannie Nguyen, Engineering Manager City of Tigard i 13125 SW Hall Boulevard II Tigard, Oregon 97223 1 Prepared by: 1 SWCA Environmental Consultants a 434 NW 6th Avenue, Suite 304 i Portland, Oregon 97209 _ - . , , gy \ti pS i, IProject 03071!10170-999 Mr ::{�'' Revised November 2005 r {2�`. :� ��. 3�: , (revised due to permit modification) ti r _ >� ' ' I � .w + r•T14/1.1,4■4°. - .°.1.:'4'. :'i f is ' w \� �b�'fir y• v� ri � y t1:• i , A f h.. . ,' :il• i- , ` 4,,,,,i-..., . itiF:%t•,�i ti � Y .' ' " � • �'I .-„ � ,,..� .r:�: }. i: :� ,;'< ,}p,t� }t '::?*k'` : . j ) . ,:S-t$,;. Ci• : •�.!. °lt,'tj �2$ �t:, a ,1 s „-.5,t ti`':. _,��j^.. r,i:. �Y I• Y�'• '.R 5 Y» - 'S r l ��. .4 ��i t/ir' `1 ^', 1. èb��' :aR• i '`N . t,4:1•�:. .,Y..7a\'„?� � .. �'�i .s..!�.•,i•3:r J�,xrr s'i•' .,�: '} '.s..r'k �`,'.'t';•3;:' .[.,� �.L_..s,?},'��'�:-a7.5�`.`': • 1 I City of Tigard, i Wall Street Extension Compensatory Wetland Mitigation Plan Prepared for: • • Vannie Nguyen, Engineering Manager , City of Tigard 13125 SW Hall Boulevard Tigard, Oregon 97223 I i Prepared by: `SWCA Environmental Consultants • , 434 NW 6th Avenue, Suite 304 Portland,Oregon 97209 • Project 03071110170.199 -, Revised November 2005 (revised due to permit modification) I Ii • • IWall Street Joint Permit App lication Compensatory Wetland Mitigation Plan r. . . Permit Modification,November 2005 Table of Contents 1 Introduction 1 2 Project Description 1 I 3 Existing Site Conditions 2 3.1 Wetland Delineation 2 3.2 Existing Conditions 3 I , 3.3 Wetland Functional Attributes 4 33.1 Impact Wetlands 4 3.3.2 Mitigation Wetlands 6 1 3.4 Hydrology 7 3.5 Mitigation Site Area 8 4 Compensatory Mitigation • 8 I4,1 Mitigation Site Selection 10 4.2 Mitigation Site Constraints 10 I . 4.3 Mitigation Design Assumptions 11 4.4. Mitigation Goals and Objectives 11 4.5 Mitigation Success Criteria 12 I 4.6 Mitigation Site Grading 12 4.7 Mitigation Site Planting 14 4.8 Mitigation Reference Site 16 1 5 Mitigation Monitoring • . 16 i 6 Construction Schedule 17 7 Maintenance 18 • 8 Contingency 19 I 9 Long-Term Protection & Security Instrument 19 I . I . List of Tables - , I . Table 1. Existin g Proposed and p sed 'Wetlands Functions 7 I Table 2. Mitigation Goals and Objectives 11 Table 3. Wetland Planting Mix _ 15 Table 4. Wetland Tree And Shrub Plantings 15 Table 5. Conceptual Mitigation Project Schedule 5 18 • • Fishman/SWCA , Project 03071110170-199 i • • Wall Street Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification,November 2005 �1 List of Figures Sheet 1. Site Location Map _20 Sheets 2a& 2b. Site Plan 21 Sheet 3. Existing Conditions 22 Sheet 4. Wetland Mitigation Plan 23 Sheets 5a--.5d. Stream Restoration Grading Plan & Profile 24 Sheets 6a—6d. Stream Restoration Details 25 ' Sheet 7. Proposed Stream and Wetland Mitigation Cross-Section Elevations 26 1 I ! I • • 1 • 1 i , ' 1. Fishman/SWCA Project 03071/10170-199 • • ii • • Wall Street Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification,November 2005 1 Introduction This wetland mitigation plan addresses compensatory mitigation requirements for stream and wetland impacts associated with the City of Tigard's proposed Wall Street Extension project. The mitigation plan meets the Department of State Lands January 15, 2003 administrative rules for compensatory mitigation as well as the U.S. Army Corps of Engineers guidance for the establishment and maintenance of compensatory mitigation projects under the Corps regulatory ' program pursuant to Section 404(a) of the Clean Water Act and Section 10 of the Rivers and ' Harbors Act of 1899(October 31, 2001). The mitigation strategy for proposed stream and wetland impacts focuses on restoration of the extensively altered downstream section of ' Pinebrook Creek to a more natural condition, including restoring its connection to Fanno Creek and creation of additional stream channel length, along with creation, enhancement and restoration of stream-associated wetlands. ' The Wall Street project is located south of Highway 99W, west of Highway 217,and east of SW g Y Hall Boulevard in Tigard, Oregon. The City of Tigard is proposing to construct a new segment of Wall Street extending northeast from SW Hall Boulevard to SW Hunziker Street(Sheet 1), The Wall Street impacts to streams and wetlands include modification to Pinebrook Creek,a first order tributary to Fanno Creek,placement of fill in wetlands and man-made ponds associated Iwith Pinebrook Creek, and placement of fill in wetlands associated with Fanno Creek. 2 Project Description The Wall Street project(Sheets 2a& 2b)consists of constructing a new section of Wall Street ' extending approximately 1,500 feet east of SW Hall Boulevard and crossing Fanno Creek and the Southern Pacific railroad tracks to connect with an existing approximately 1,600 linear foot section of Wall Street. The City has applied to the Oregon.Department of Transportation for I permission to cross the railroad tracks. The paved Wall Street roadway will be 48 feet wide and will include curbs, 5 foot wide planters and 6 foot wide sidewalks on both sides. The total width of the roadway and improvements is 72 feet. The existing section of Wall Street, located east..of ' the railroad tracks, is a 40 foot wide paved 2-lane road that will be widened.to 48 feet and improved to a total width of 70 feet. . ' A 320 foot bridge over Fanno Creek will span both the creek and its floodway. Due to the elevation of Hall Boulevard and existing grades along the proposed alignment, the elevation of the bridge deck will be approximately 6 to 8 feet above ground level and will allow for Imovement of wildlife along Fanno Creek beneath the bridge. The paved roadway of the bridge deck will be 36 feet wide with 6 foot wide'sidewalks and pedestrian rails on both sides, for a total width of 50 feet. V The City evaluated nine alternative roadway alignments and five alternative bridg e lengths for . the proposed Wall Street extension in order to minimize impacts to Pinebrook Creek, associated wetlands and ponds and the Fanno Creek floodway..The presently proposed project(Alternative 9) is a variation of the City's previous Preferred.Alternative. The present design keeps the intersection of Wall Street with.Hall Boulevard at the same location as the Preferred Alternative, 3 Fishman/SWCA V Project 03071110170-199 . 1 Wall Street J i t Permit o n Pe I Application Compensatory Wetland Mitigation.Plan Permit Modification,November 2005 ' which has been approved by ODOT, and shifts the remaining roadway up to 70 feet north of the Preferred Alternative. The presently proposed alignment has several advantages over the City's previous Preferred Alternative. The proposed project will result in less impact to Pinebrook Creek and associated wetlands and will allow Pinebrook Creek to remain on the south side Of Wall Street, eliminating the need to relocate Pinebrook Creek as would have been required with • the Preferred Alternative. Relocating Pinebrook Creek would have required one 90 to 100 foot culvert to take Pinebrook Creek to the north side of Wall Street and possibly a second 90 to 100 foot culvert to take Pinebrook Creek back to the south in order to connect with Fanno Creek in . I the event that Pinebrook Creek could not be routed underneath the westerly bridge span. In addition, due to the bridge being moved 70 feet north, the bridge will more completely span the East Pond. The Wall Street project is proposed to be constructed in two phases (Phases 1 and 2). The. wetland permit application includes proposed wetland impacts associated with construction of the entire project. A total of 030 acre of wetland impact is proposed for the entire project. Phase 1 includes construction of the western 360 feet of Wall Street, beginning at SW Hall Boulevard and ending west of the East Pond, in order to provide access to the Tigard Library and the Fanno Pointe Condominiums that is not directly off of Hall Boulevard. Phase 1 will involve 0.11.acre of wetland and stream impacts to construct the roadway and fill slopes for the first 360 feet of the project. This phase will involve impacts to Pinebrook Creek and associated wetlands and minor I impacts to the West Pond. Phase 2 includes construction of the remainder.of Wall Street to Hunziker Street. Phase 2 will involve 0.19 acre of wetland impact including minor impacts to the East Pond and wetlands located east of Fanno Creek in order to construct the bridge wingwall on I the west side of the bridge and the roadway and fill slopes for the remainder of the alignment.No impacts are proposed to Fanno Creek from either Phase 1 or 2 of the project. A 320 foot bridge o'ver Fanno Creek will span both the creek and its floodway. Bridge pilings will be placed • outside the Fanno Creek stream channel and delineated wetland areas. . The project also includes construction of one water quality facility to treat runoff from Phase 2 of. ' the project. This water quality facility will be located on the'.east side of Fanno Creek underneath. the bridge span, and will outfall to wetlands associated with Fanno Creek. Runoff from Phase 1 of the project will be treated in the water quality facility recently constructed in the southeast corner of the Tigard library site. This water quality facility was sized to treat runoff from both the library and Phase 1 of the Wall Street project. . - 3; Existing Site Conditions 1 ' 3.1 Wetland Delineation Three separate wetland delineations were conducted by different consultants in the proposed Wall Street project and mitigation areas. A wetland delineation report was prepared for the Tigard Library site by Kurahashi&Associates in June 2002 (DSL WD#2002-0324; DSL concurrence letter dated October 8,2002). The study area for the library delineation included the proposed library site as well as the Wall Street right-of-way extending from Hall Boulevard to the west side of Fanno Creek. A wetland delineation report for the proposed Wall Street right-of . 'It Fishman/SWCA Project 03071110170-199 2 • IWall Street Joint:Permit Application Compensatory Wetland Mitigation Plan I . Permit Modification,November 2005 way extending from the west side of Fanno Creek to the east side of the railroad tracks was prepared by Pacific Habitat Services in September 2003 (DSL WD# 2003-0599;DSL concurrence letter dated March 15, 2004). A wetland delineation report for the adjacent Fanno I • Pointe Condominiums site to the south, where a portion of the Wall Street right-of-way is located • and where partial wetland mitigation is proposed to occur, was prepared by Rhea Environmental . I Consultants in August 2002 (DSL WD# 2003-0024;DSL concurrence letter dated June 2, 2003). All delineated streams and wetlands are shown on Sheet 3. I ,3.2 Existing Conditions • Classification of the site wetlands associated with Pinebrook and Fanno Creeks according to • Cowardin class is palustrine,persistent emergent and broad-leaved deciduous scrub-shrub wetlands with a saturated semipermanent/seasonal water regime(PEM1Y&PSS 1.Y)'. A minor palustrine, broad-leaved deciduous forested, saturated semipermanent/seasonal (PFO 1 Y) wetland. Icomponent is also present on the east side of Fanno Creek where a few Oregon ash trees are . • present. The two man-made ponds associated with Pinebrook Creek are classified as palustrine, • open water,permanently flooded,diked/impounded,excavated(POWHhx). IPinebrook Creek and associated wetlands and man=made ponds are shown on Sheet 3. Pinebrook Creek has been extensively modified from,its historic condition and currently flows easterly I through the site to•its confluence with Fanno Creek. The stream flows through a series of pipes and is associated with two man-made ponds that adversely affect tlie_.downstream water quality of Fanno Creek. The original outfall of Pinebrook Creek onto the project site was from a 115 foot long.18 inch concrete culvert under..Hall Boulevard. This culvert has been replaced with a.... . . . I 118.5 foot long, 57 inch wide by 38 inch high arch culvert with natural substrate to meet fish passage requirements as part of the recent Hall Boulevard widening project. Hall Boulevard was i I widened approximately 13 to 15 feet east of the existing edge of pavement within the road right- of-way for a distance of approximately 1,000 feet, which was a City and.ODOT approval requirement for the Fanno Pointe and Tigard library projects. • . Pinebrook Creek is daylighted for approximately 55 feet on the east side of Hall Boulevard • before it is culverted around a diversion pond (the West Pond) in a 12 inch concrete culvert for I approximately 140 feet. The West Pond was constructed in the early 1960s based upon a review of historic aerial photographs. The pond contains up to• feet of sediment and has a silty clay . bottom. Concrete cylinders form the walls of the pond at the downstream end. A narrow fringe of I emergent wetland vegetation surrounds the pond; vegetation is dominated by reed canarygrass, and other common fringe species include purple loosestrife, common horsetail,and nodding beggar's tick. Only very limited shading is provided by a few small trees including curly willow I located adjacent to the northeast corner of the pond and an English birch tree located adjacent to the SW corner of the pond. The pond surface was covered with algae during the August, September, and October 2004 site visits. The pond receives flow from Pinebrook Creek via a 4- D inch PVC pipe and outfalls back into Pinebrook Creek in a second approximately 35 foot long daylighted section of Pinebrook Creek,that is heavily eroded, located below the pond to the east. Below this second daylighted section, Pinebrook Creek is culverted in an 1.8 inch concrete Iculvert for approximately 15 feet. Downstream of this culvert,Pinebrook Creek is daylighted for approximately 200 feet and flows through an emergent and scrub-shrub wetland area dominated by invasive species including reed canarygrass,purple loosestrife, bittersweet nightshade, a . Fishman/SWCA Project 03071110170-199 3 Wall Sheet Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification,November 2005 creeping buttercup and Himalayan blackberry and also including scattered native Oregon ash, . rose and willow. Pinebrook Creek appears to consist of two to three narrow(approximately 6 inch) shallow meandering channels through the reed canarygrass. A main stream channel is not visible. The downstream end of Pinebrook Creek flows into a second man-made pond(the East Pond) located at the top of bank of Fanno Creek.This pond was constructed in the late 1940s or early 1950s based upon a review of historic aerial photographs. The pond appears to have been constructed by pushing up a dirt berm at the downstream end of Pinebrook Creek just prior to its 'confluence with Fanno Creek, blocking fish passage. The East Pond is heavily silted in and contains at least 3 to 4 feet of sediment. A fringe of emergent wetland vegetation surrounds the pond; vegetation is dominated by reed canarygrass, reed mannagrass, peppermint, and purple loosestrife. Other common species include floating penny-wort,American speedwell,spotted. ladysthumb, soft rush, beggar's tick, and small-fruited bulrush. Limited shading is provided.by Oregon ash and red alder trees along Fanno Creek on the east side of the pond. The pond surface • was covered with algae during the August, September and October 2004 site visits, • 3.3 Wetland Functional Attributes Existing wetland functional attributes were evaluated by Fishman/SWCA using the Hydrogeomorphic (HGM)based assessment for the Willamette Valley ecoregion(DSL, February 2001). HGM data sheets are available upon request. Wetlands and ponds associated with Pinebrook Creek belong to the Riverine Impounding class. The two man-made ponds as well as the wetlands along the lower portion of Pinebrook Creek are impounded as a result of having restricted outlets due to the presence of berms and an undersized culvert. Wetland mitigation will be conducted on-site adjacent to Pinebrook Creek. Wetland mitigation will consist of reconstructing the Pinebrook Creek stream channel along with wetland creation, enhancement and restoration of wetlands along Pinebrook Creek within its active floodplain. The two man-made ponds will be taken off-line from Pinebrook Creek and will be reconfigured into seasonally ponded wetlands. The reconfigured East Pond wetland will receive inputs of treated stormwater from the bioswale for the Tigard Library and Phase 1.of the Wall Street project. The mitigated Pinebrook Creek wetlands will consist of temporarily ponded areas within active biennial floodplains and will therefore still be classified as Riverine Impounding. 3.3:1 Impact Wetlands • • I Thirteen functional capacities were assessed for the existing wetlands and ponds associated with Pinebrook Creek, The same.functional capacities were assessed for the mitigated Pinebrook • Creek wetlands in their proposed future post-mitigation condition. Functional capacities are listed below with the corresponding scores, with"1.0"having the highest functional capacity score and "0" having the least. , 1. Water Storage and Delay Score=0.10 2. Sediment Stabilization and Phosphorous Retention Score=0.93 ' 3. Nitrogen Removal • Score=0.66 . 4. Thermoregulation Score=0.51 Fishman/SWCA S Project 03071/10170-199 - 4 IWall Street Joint Permit Application Compensatory Wetland Mitigation Plan I . Permit Modification,November 2005 5. Primary Production Permit =0.73 6. Resident Fish Habitat Support Score=0,68 . I 7. Anadromous Fish Habitat Support Score= 0,0 8. Invertebrate Habitat Support Score= 0.55 9. Amphibian& Turtle Habitat Score = 0.57 I 10. Breeding Waterbird Support 1 1 Score=0.0 H. Wintering& Waterbird Support Score=.0.48 12. Songbird Habitat Support . • Score=0.62 I13. Support of Characteristic Vegetation - Score=0.60 Existing functions 1, 7 and 10 of the Pinebrook Creek wetlands and ponds scored very low(0.10 I or lower). Function 1, water storage and delay, scored 0.10 due to the fact that 30%to 60%of the site is inundated only seasonally and the predominant vertical increase in surface water level is less.than 2 feet. Since the ponds are permanently inundated, the capacity for these areas to Istore additional water during seasonal storm events is limited, . Function 7, anadromous fish habitat support, scored 0 since Pinebrook Creek is not accessible to Ianadromous fish during high water due to the presence of a berm at the downstream end of Pinebrook Creek and the East Pond and the 6 to 8 foot nearly vertical banks of Fanno Creek at the confluence with Pinebrook Creek. I Function 10,breeding waterbird support, scored 0 since less than 0.5 acre of surface water g Pp I persists until at least July 1; however, we believe its function to be higher than the HGM score indicates.These ponds do provide some breeding waterbird support function since nearby residents have reported observations of ducklings using the ponds. There is.potential to increase ' • the scores for functions 1 and 7 through mitigation. . Functions 3, 4 and.13 scored medium (0.51 to 0.66) and also offer an opportunity to increase these functions through mitigation. Function 3, nitrogen removal, is limited due to the fact that Ithe two ponds are ponded at nearly the same depth year-round, which limits the percent of the site that is inundated only seasonally as well as the difference between predominating high and ,. •' low water levels on the site. . Function 4,thermoregulation, scored 0.51; however, we believe its function to be much lower based upon water temperature data collected on the site by Fishman/SWCA. The thermoregulation function is described in the HGM manual"If measured,this function could be expressed as: the decrease in temperature of water exiting a site via surface,flow or infiltration, I compared with temperature of the water when it enters the site via surface flow."The current functioning of the ponds is opposite to this definition. Instead of decreasing water temperatures in downstream waters,the ponds remain ponded throughout the summer and contribute heated I water to downstream Pinebrook and Fanno Creeks. Fishman/SWCA biologists measured water temperatures as being 17.0°C in Pinebrook Creek upstream of the West Pond, 18.0°C in the West Pond, and 17.5 °C downstream of the West Pond. Water temperature near the middle of the I East Pond measured 20.0°C. Water temperature measured 18.0°C in Fanno Creek. Clearly, these two man-made ponds contribute to thermal pollution in Pinebrook and Fanno Creeks. I . " . Fishman/SWCA Project 03071110170=199 5 i Wall Street Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification,November 2005 Function 13,support of characteristic vegetation, is limited by the low occurrence of trees and shrubs and lack of native species in the wetland. • 3.3.2 Mitigation Wetlands 1 Functional capacities and their corresponding scores for the proposed mitigated Pinebrook Creek • wetlands (post-mitigation) are shown in Table 1 on the following page. Increases or decreases in function from the existing wetlands proposed to be impacted are also shown. According to the HGM assessment, the wetland mitigation will result in functional gains for several functions ,including water storage and delay, nitrogen removal, anadromous fish habitat support, amphibian • and turtle habitat, wintering and migratory waterbird support, and support of characteristic vegetation. Although not reflected the H scores, g cted byte GM.sco es, we believe there will be functional gains for several other functions. The proposed mitigation will result in an increase in thermoregulation function due to removal of two on-line ponds that currently contribute thermal pollution to Pinebrook and Fanno Creeks.The mitigation will also provide a net increase in primary production due to the reconfiguration of the two man-made ponds, which are currently unvegetated,into emergent and scrub-shrub wetlands. Resident fish habitat support will also be increased due to the reconfiguration of Pinebrook Creek into a more defined stream channel, whereas its current configuration of two to three shallower undefined channels does not provide fish passage at low flows. ' The proposed mitigation may result in minor decreases in a few functions. Any minor loss in ---sediment stabilization and phosphorous retention will be mitigated for by the water quality • f '- acility to be constructed as part of this project. The mitigation wetlands may have reduced invertebrate habitat support and songbird habitat support as compared with the existing wetlands due to the removal of the two on-line ponds; however, the presence of other perennial water sources very close to the project site including Fanno Creek and a more natural pond approximately 900 feet to the north of the project area on the Fanno Creek Park site, should mitigate for the loss of the ponds on the site. The increase in vegetation diversity and structure of , the mitigation site, removal of invasives, and increase in the number of native species is considered to provide a net benefit in wildlife habitat function. There will be a minor reduction in the breeding waterbird support function, although it is not reflected by the HGM scores. The existing ponds do provide some breeding waterbird support function based upon observations of nearby residents, and reconfiguring the ponds into seasonally ponded wetlands will reduce this . function. I • The existing Pinebrook Creek and associated wetlands provide habitat for wildlife species • II I commonly found in disturbed urban wetlands and that are resistant to human and domestic animal disturbance. Construction of the proposed Wall Street when taken in combination with the recently constructed Tigard library and Fanno Pointe Condominiums'adjacent to the wetland mitigation site may reduce the wildlife value of the mitigation site, although species likely to use I the site should already be accustomed to human disturbance. In order to increase the wildlife habitat function of the wetland mitigation site,an upland buffer will be maintained adjacent to I the wetland mitigation site. In addition, educational signs will be posted to request that the public avoid entering or disturbing the mitigation area. ■ Fishman/SWCA Project 03071110170-199 6 IWall Street Joint Permit App lication ' Compensatory Wetland Mitigation Plan IPermit Modification,November 2005 ITable 1. Existing and Proposed Wetland Functions Function Impact Wetlands Mitigation Wetlands Net Gain/Loss I p 9 1.Water Storage and Delay 0.10 0.20 +0.10 2.Sediment Stabilization and 0.93 0.87 -0,06 I , Phosphorous Retention 3. Nitrogen Removal 0.66 0.81 . +0.1.5 4. Thermoregulation 0.51 0.14 -0.37 •5. Primary Production 0.73 0.71 -0,02 I6. Resident Fish Habitat Support 0.68 0,61 -0.07 . I 7.Anadromous Fish Habitat 0.0 0.75 +0.75 Support 8. Invertebrate Habitat Support 0.55 0.42 -0.13 I •9.Amphibian.&Turtle Habitat 0.57 . • 0.63 +0.06 1 Breeding Waterbird Support 0.0 0.0 No change 11.Wintering &Migratory 0.48 0.52 +0.04 Waterbird I _ 12. Songbird Habitat Support 0.62 0.46 -0.16 13.Support of Characteristic 0.60 0.96 +0.36 IVegetation I 3.4 Hydrology . The hydrology of Pinebrook Creek and its associated wetlands, as well as wetlands on the east . I side of Fanno Creek, are driven by inflow of upstream hydrology and direct precipitation on the ground surface and fluctuations in seasonal groundwater levels on the site. In addition,the two man-made ponds both receive surface flow from Pinebrook Creek. The ponds remain ponded I . year.-round since their outlets are restricted due to the presence of berms or an undersized culvert. Both ponds will be taken off-line to prevent these ponds from continuing to contribute thermal and nutrient pollution to Fanno Creek. The ponds will be reconfigured as stream-associated I wetland areas (HGM class Riverine Impounding). Wetland mitigation site hydrology sources - will include primarily precipitation and groundwater,although the reconfigured East Pond • wetland area will also receive treated stormwater from the water quality facility for the Tigard I Library and,Phase 1 of the Wall Street project. Hydrology is not anticipated to be sufficient to maintain the reconfigured East and West Pond wetland areas as ponded year-round once they are taken off-line from Pinebrook Creek. The reconfigured wetland areas are anticipated to be I . - I Fishman/SWCA Project 03071/10170-199 7• 1 • Wall Street Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification,November 2005 , seasonally shallowly ponded from the fall through the spring. The fact that these ponds will dry up during the summer is beneficial for native wildlife in the area, especially amphibians, since 1 the ponds will no longer provide habitat for bullfrogs. 3.5 Mitigation Site Area Wetland mitigation will occur primarily on-site adjacent to the proposed impacts to Pinebrook 'Creek and associated wetlands. Existing vegetation in the proposed wetland creation and wetland restoration areas includes primarily non-native upland grasses and fortis with a few non-native black locust trees, generally 10 inches.in diameter. Cover by native species is very limited. Several noxious and invasive species are also present and include giant hogweed, Himalayan blackberry and thistle. Surface soils are generally fine-textured silty clay loams and are mapped as hydric Huberly silt loam or Quatama loam, which may have hydric Huberly inclusions.. • 4 Compensatory Mitigation A total of 0.30 acre of wetland fill is proposed for the entire project(Sheet 2a). Proposed stream and wetland mitigation(Sheet 4)consists of a combination of stream channel and wetland creation(0.08 acre; 0.053 acre mitigation credit at 1.5:1),wetland enhancement.(0.29 acre; 0.097 acre mitigation credit at 3:1), and wetland restoration (0.20 acre; 0.20 acre mitigation credit at 1:1). The Pinebrook Creek stream channel and adjacent wetlands will be reconstructed slightly south of their existing location,partially in existing uplands and partially in existing wetland. Pinebrook Creek will be reconnected to Fanno Creek via a historic stream channel located on the Fanno Pointe Condominiums site. The two man-made ponds will be taken off-line from . Pinebrook Creek and will be reconfigured as seasonally ponded forested/scrub-shrub wetlands. • The remainder of the proposed wetland impacts will be mitigated for by restoring wetlands south of the East Pond. A portion of the upland berm along the south edge of the East Pond will be • removed. The berm is likely material sidecast from excavation of the East Pond and placed in an area mapped as having hydric Huberly soils. The upland area located southeast of the berm may also be excavated to restore wetlands. Fill was likely historically placed in this area, mapped as having soils with hydric Huberly inclusions, during construction of an 8 inch sanitary sewer line located just south of the berm. The berm and the area to the southeast were determined to be upland in the wetland delineation conducted by Kurahashi &Associates for.the Tigard Library , site. These areas are surrounded by wetlands on the north, west and south and are bordered by Fanno Creek on the east; therefore we believe the berm and sewer alignment were constructed in historic wetlands and that removal of the berm and upland fill area to the southeast should receive wetland mitigation credit of 1:1, for wetland restoration. i The two man-made ponds that are on-line with Pinebrook Creek will be taken off-line to prevent . these ponds from continuing to contribute thermal and nutrient pollution to Fanno Creek. The I ponds will be reconfigured as stream-associated wetland areas. Wetland mitigation site . hydrology sources will include primarily precipitation and groundwater, although the • reconfigured East Pond wetland area will also receive treated stormwater from the bioswale for . Phase 1 of the Wall Street project and the Tigard Library. Hydrology is not anticipated to be Flshman/SWCA Project 03071110170-199 8 • IWall Street Joint Permit Application . Compensatory Wetland Mitigation Plan IPermit Modification,November 2005 sufficient to maintain these areas as ponded year-round once they are taken off-line from I Pinebrook Creek. The reconfigured wetland areas are anticipated to be seasonally shallowly . ponded from the fall through the spring. The fact that these ponds will dry up during the summer is beneficial for native wildlife in the area since the ponds will no longer provide habitat for I bullfrogs. . . Approximately 550 linear feet of new stream channel will be reconstructed to mitigate for the I ,approximately 270 linear feet of Pinebrook Creek to be impacted. The new section of Pinebrook Creek will be constructed along the south side of Wall Street. The new stream channel will begin _ at the outlet of the culvert under Hall Boulevard and.will head easterly through the reconfigured • • IWest Pond wetland area, continue along the north edge of the Fanno Pointe Condominiums site, and then head southerly to connect to an historic stream channel located in the open space tract I located east of the Fanno Pointe Condominiums and owned by the City of Tigard. Based upon a review of aerial photos dating back to 1936, this historic stream channel appears.to be the historic lower portion of Pinebrook Creek,prior to its realignment in the late 1940s or early • 950s for the purpose of creating the East Pond. The relocated Pinebrook Creek is anticipated to Ii provide improved fish habitat_over the existing stream in several ways. Most importantly, connecting the relocated Pinebrook Creek with the historic channel at its downstream end will ' provide fish passage for cutthroat trout and juvenile steelhead during high stream flows of Fanno ICreek. There is currently no fish passage from Fanno Creek to Pinebrook Creek since the 1 confluence of Pinebrook and Fanno Creeks consists of an approximately eight foot drop in . elevation from the downstream edge of the East Pond to Fanno Creek. In addition,the relocated stream channel will contain higher flows since it will consist of one main stream channel instead of the two to three shallow undefined channels that currently exist..The historic channel has Isinuosity, in-stream woody structure, and a mature willow canopy. These habitat features are lacking for the existing Pinebrook Creek. From the location where the existing Pinebrook Creek 1 enters the site from under Hall Boulevard, the stream is currently culverted twice in culverts not I designed for fish passage for a total length of approximately 170 feet.The reconfigured Pinebrook Creek will only be culverted once under the Fanno Pointe access road for a distance of 65 feet. This culvert will be a 42 inch diameter CMP with a flat grade and will be buried 6 inches Iand have natural substrate (Sheet 6d). ,. Removal of riparian vegetation adjacent to Pinebrook and Fanno Creeks will occur in order to ' construct the roadway, bridge wingwalls and bridge deck. Construction of Phase-1 of the project will require removal of approximately 12 trees adjacent to Pinebrook Creek. These trees consist mainly of non-native black locust and non-native hawthorn and one willow. Construction of the I bridge deck will require larger shrubs and a few trees to be removed, although herbaceous . vegetation and smaller shrubs will remain underneath the bridge. The height of the bridge deck will be 6 to 8 feet above grade and will allow light penetration to support vegetation underneath. I Construction of Phase 2 of the project, including the bridge,will require removal of _ approximately 12 Oregon ash and red alder trees and 5 non-native hawthorn trees. Replacement . native trees and shrubs will be planted along the top of bank of the Fanno Creek as well as along I the new Pinebrook Creek stream channel to mitigate for removal of vegetation in the riparian area. A natural resource assessment and mitigation plan were submitted to Clean Water Services Fishman/SWCA Project 03071110170-199 9 • Wall Street Joint Permit Application .1 • Compensatory Wetland Mitigation Plan Permit Modification,November 2005, for impacts within the 50 foot vegetated corridors adjacent to Fanno Creek, Pinebrook Creek and wetlands. 4.1 Mitigation Site Selection The mitigation site is located on-site adjacent to the proposed impact area of Pinebrook Creek and associated wetlands and ponds. Reconstructing Pinebrook Creek on the south side of the proposed Wall Street and south of its existing location is preferred over reconstructing the stream channel on the north side of Wall Street as was originally proposed under the City's previously , preferred alternative alignment for Wall Street, Reconstructing Pinebrook Creek on the south side of Wall Street minimizes the number of culvert crossings of Pinebrook Creek, Relocating Pinebrook Creek to the north side of Wall Street would have required one 90 to 100 foot culvert to take Pinebrook Creek to the north side of Wall Street and possibly a second 90 to 100 foot .culvert to.take Pinebrook Creek back to the south in order to connect with Fanno Creek in the event that Pinebrook Creek could not be routed underneath the westerly bridge span. An access road for the Fanno Pointe Condominiums will need to cross Pinebrook Creek, but the need for the library access road to cross Pinebrook Creek will be eliminated by reconstructing Pinebrook Creek on the south side of Wall Street. The proposed relocation of Pinebrook Creek on the south also works better for realigning Pinebrook Creek with its historic channel and confluence with Fanno Creek. • 4.2 Mitigation Site Constraints • Mitigation site constraints include the limited site area that is available in which to reconstruct Pinebrook Creek due to the close proximity of the Tigard Library and the Fanno.Pointe Condominiums to the location of the proposed right-of-way for the Wall Street project, The • distance between the grading limits of the proposed Wall Street and the grading limits of the Fanno Pointe site is 40 feet wide at its narrowest point. The proposed grading plan for the reconstructed Pinebrook Creek and adjacent wetland creation area is constrained by the ' ' elevations of the Fanno Pointe site and Wall Street, The grade of the reconstructed stream "channel will be 1 to 2 percent in the upper portion and will steepen to 6 percent in the lower portion in the vicinity of the historic channel. The tendgncy would be for low stream flows to remain in the stream channel, preventing hydrology from reaching the adjacent created wetland areas, The design of the stream channel takes this into account and incorporates in-stream structure, stream meanders and other measures to facilitate stream flows overtopping the ' . streambanks during the two-year flood event in order to provide requisite wetland hydrology. . In addition, the.steep and nearly vertical banks of Fanno Creek will prevent the wetland I mitigation site,including the wetland restoration/berm removal area, from receiving hydrologic inputs from overbank flooding of Fanno Creek except during very large storm events (the 1996 I aerial flood photo does not show any flooding on the site). . • • Fishman/SWCA Project 03071110170.199 10 • IWall Street Joint Permit Application Compensatory Wetland Mitigation Plan I Permit Modification,November 2005 4.3 Mitigation Design Assumptions Design assumptions include the presence of requisite wetland hydrology within the created and Irestored wetland areas. Design of the reconstructed Pinebrook Creek and the adjacent wetland creation area has incorporated a hydrologic analysis of the upstream drainagebasin and existing Pinebrook Creek stream flows to.determine the size of stream channel that would allow the I . stream to overtop its banks during the two-year flood event in order,to provide hydrology to the created wetland areas adjacent to Pinebrook Creek. In addition, The large rocks and root wads to be used in the weir structures will reduce stream flow velocity and facilitate overbank flooding to I . provide hydrology to stream-associate wetlands during high flows. ' Construction of Phase 1 of the Wall Street project will require re-routing.the outfall from the stormwater quality facility that was recently constructed on the Tigard Library site. The stormwater outfall currently outfalls to wetlands associated with Pinebrook Creek that are I proposed to be impacted by the Wall Street project. The outfall will be relocated to the east to the reconfigured East Pond wetland area in order to maintain wetland hydrology of this area once the East Pond is taken off-line from Pinebrook Creek. Hydrology from the reconfigured East Pond I wetland area will overflow during larger storm events to provide hydrology to the wetland restoration/berm removal area adjacent to the south and will eventually flow to Pinebrook Creek.. I 4.4 Mitigation Goals and Objectives - •. 9 1 . Table 2 below lists the goals and objectives for the mitigation project. The goals have been formulated based on the focus of improving fish and wildlife habitat in Pinebrook Creek and the lower reach of Fanno Creek. Table 2. Mitigation Goals and Objectives I Goal . Objective Restore Pinebrook Creek to a more natural stream Remove man-made on-line ponds;reconstruct channel and create associated wetlands Pinebrook Creek stream channel and associated I , . wetlands based on hydrologic analysis of upstream drainage basin' IRestore wetlands within the 100-year floodplain ' Remove berm south of East Pond - Improve water quality in Fanno Creek Take two man-made ponds off-line from Pinebrook i Creek to eliminate thermal and nutrient pollution inputs . to Fanno Creek;plant trees along top of bank of Fanno Creek to improve shading Restore fish passage to Pinebrook Creek from Fanno Reconnect Pinebrook Creek to Its historic stream I Creek during high flow storm events 1 channel on the Fanno Pointe site Improve wildlife habitat adjacent to Pinebrook Creek Remove and control noxious and invasive species ' Including purple loosestrife, Himalayan blackberry and . bittersweet nightshade;create stream-associated wetland areas and plant with native species I Fishman/SWCA Project 03071110170-199 11 il Wall Street Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification,November 2005 4.5 Mitigation Success Criteria . The success criteria listed below are recommended to be met at the end of the 5-year monitoring period. It is likely that some replanting will be necessary during the first few years, and there -, may be revisions to the species to be replanted based upon adaptive management reacting to seasonal hydrology of the mitigation site. Recommendations for corrective actions(if needed)to achieve mitigation success will be included in the annual wetland monitoring report, and these actions will be implemented as needed throughout the monitoring period to ensure that the success criteria are met at the end of the 5-year monitoring period. Success criteria and length of • 'the monitoring period are subject to approval by the Division of State Lands and the Corps of Engineers as conditions of the wetland fill permit. V 1. Wetland mitigation areas will meet the wetland hydrology criterion in the 1987 Corps s.of g Y gY � Engineers Wetland Delineation Manual. The presence of free water or soil saturation within 12 inches of the surface at the time of monitoring will meet the primary wetland hydrology indicator. ' 2. A minimum of 80% survival of planted trees within the wetland mitigation site.Natural 1 recruitment of desirable native species is encouraged. 3. A minimum 80% survival of planted shrubs within the wetland mitigation site.Natural recruitment of desirable native species is encouraged. 4. A minimum 80%herbaceous cover of facultative or wetter species within the wetland I mitigation site. 5. Less than 30%combined cover of non-native invasive.species within the wetland mitigation site. Non-native invasive target species include: reed canarygrass (Phalaris arundinacea),teasel (Dipsacus sylvestris), Canada thistle (Cirsium arvense), common thistle (Cirsium vulgare),purple loosestrife(Lythrum salicaria), Himalayan blackberry , (Rubus discolor)and bittersweet nightshade(Solarium dulcamara). 4.6 Mitigation Site Grading A new, approximately 550 linear foot section of Pinebrook Creek will be constructed south of Wall Street(Sheets 5a-5d). The new stream channel will begin at the outlet of the culvert.under Hall Boulevard and will head easterly through the reconfigured West Pond wetland area, continue along the north edge of the Fanno Pointe Condominiums, and then head southerly to connect to an historic stream channel located in the open space tract to the east of the Fanno Pointe Condominiums. The reconfigured Pinebrook Creek will be culverted once under the Fanno Pointe access road for a distance of approximately 65 feet. This culvert will be a 42 inch diameter CMP with a flat grade and will be buried 6 inches and have natural substrate. ' The West Pond and East Pond will be taken off-line from Pinebrook Creek prior to the summer of 2006 in order to allow these areas to dry up prior to site grading, estimated to begin in late summer or early fall of 2006. The berm at the downstream end of the East Pond is severely Fishman/SWCA . Project 03071/10170-199 12 IWall Street Joint Permit Application Compensatory Wetland Mitigation Plan IPermit Modification, November 2005 eroded and undercut and will require stabilization to prevent the berm from washing out during a I large storm event which could potentially result in a large sediment load being delivered to Fanno Creek. Details of the stabilization of the berm will be provided for agency review as soon construction plans are available. . Ias The reconstructed stream channel will be a tra p ezoidal-sha p ed channel approximately 2 feet wide at the bottom, 5 feet wide at the top of bank, and 1.5 feet deep. The stream channel will be I ,stepped with a series,of rock and/or log weir structures to meet ODFW fish passage criteria for juveniles. The approximate location of the reconstructed stream channel is shown in Sheets 5a- 5d, and cross-sections and weir details are shown in Sheets 6a---6c. The alignment of the . . Ireconstructed stream channel may be refined by Fishman/SWCA in the field based upon site topography and other habitat features and will be staked prior to the start of excavation. The stream channel and the adjacent wetland creation area will be constructed using a small track- Imounted excavator,or its equivalent, to minimize soil compaction. Erosion control fabric will be used at all weir structures in the restored Pinebrook Creek stream channel to prevent downstream sedimentation into Fanno Creek. I ' Stream-associated wetlands will be created adjacent to the reconstructed Pinebrook Creek and ' will extend up to 10 feet north and south of the stream channel. The created wetlands will consist Iof a series of wetland terraces that will parallel the stepped portions of the stream channel. The wetland terraces will contain central depression areas to retain hydrology for longer periods. Since the existing grade will need to be lowered several feet in order to create stream-associated wetlands, a soil conditioner will need to be incorporated in the wetland creation area. We recommend a fully composted ground bark, fine-textured instead of medium bark mulch, with 5 pounds of 22-16-8 fertilizer mixed with each 5 cubic-yards of composted material. Soil conditioner should be spread to a uniform depth of 4 inches throughout the wetland creation area 1 and incorporated to a depth of'6 to 8 inches prior to completion of final grade. Topsoil salvage " , Iand reuse is not recommended in wetland creation or enhancement areas due to the presence of reed canarygrass on the site and the possibility that redistributing the seed bank could result in reed canarygrass colonization of the newly graded wetland areas. IThe design of the stream channel and wetland terraces.was based upon a hydrologic analysis of the upstream drainage basin and existing stream flows with the goal of ensuring that the stream _ I would overtop its banks during the two-year flood event in order to provide hydrology to the created wetland areas adjacent to the stream channel. The large rocks and root wads to be used in the weir structures will reduce stream flow velocity and facilitate overbank flooding to provide I hydrology to stream-associate wetlands during high flows. In addition, lowering the existing topography in the wetland creation area should intersect the seasonal_groundwater and soil saturation levels to provide additional wetland hydrology. The total stream and wetland creation I area will be 0.08 acre and is shown in Figures 5a—5d. Cross-sections for the wetland creation areas are shown in Sheet 7. I Wetland restoration will occur immediately south of the East Pond and will consist of removal of a portion of the upland berm that was historically placed in wetlands adjacent to Pinebrook Creek. The upland area located southeast of the berm may also be excavated to restore wetlands • iFishman/SWCA Project 03071/10170-199 13 . Wall Street Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification, November 2005 ' that were likely filled during construction of an 8 inch sanitary sewer line located just south of the berm. The wetland restoration area will total 0.20 acre and will be graded to match the I elevation of the reconfigured East Pond wetland to the north and the existing wetlands on the Fanno Pointe site to the south. Since the existing grade will be lowered several feet, soil conditioner will also need to be incorporated in the wetland restoration area. Hydrology of the wetland restoration area will include inputs of treated stormwater'from the reconfigured East Pond wetland and seasonal groundwater. Wetland mitigation activities will require 0.28 acre of temporary wetland impact due to removal in existing wetlands. These impacts will include 0.08 acre in the proposed wetland enhancement area in order to reconstruct Pinebrook Creek and associated wetlands. Additional temporary wetland impacts will also be necessary in order to lower the existing elevations in three wetland • • areas in order to connect the berm removal/wetland restoration area with existing wetlands to the . south on the Fanno Pointe site. These three wetland areas to be temporarily impacted include: the East Pond at its the south side(0.02 acre), a small existing drainage south of the East Pond (0.02) and existing wetlands on the Fanno Pointe site (0.13 acre). Finally, excavation of the new Pinebrook Creek stream channel on the Fanno Pointe site will result in 0.03 acre of temporary I impact to.existing.wetlands 4.7 Mitigation Site Planting . 1 Mitigation site planting will incorporate a mixture of emergent and forested/scrub-shrub planting areas. Shrubs will be planted along the top of stream batik of the reconfigured Pinebrook Creek.. 1 Stream-associated wetland terraces will be seeded with the wetland planting mix, and sedges and rushes will be planted in the central depression areas. The reconfigured West and East Ponds and the wetland restoration/berm removal area will be seeded and planted with native trees and I shrubs to create forested/scrub-shrub wetlands. Seeding and planting specifications for the wetland mitigation site are listed,below in Tables 3 and 4. Planting specifications for the upland buffer were incorporated into the natural resource assessment and vegetated corridor mitigation plan that was submitted to Clean Water Services (CWS File No.4203). We anticipate seeding will occur in the fall of 2006 after completion of grading and prior to the t onset of winter rains. The seed will be broadcast evenly over the mitigation site and hand raked into the top few inches of soil to ensure good soil-seed contact. Straw mulch will be placed over seeded areas and crimped into the soil. Once herbaceous groundcover has fully established, straw mulch may be removed and brush blankets or tree mats will be placed around all tree and shrub plantings to retain moisture and discourage weed growth. Protector tubes will be installed around all tree plantings to protect them from beaver, nutria and small rodent damage.'Irrigation of plantings may be needed during the summer months until plants become established. Planting of trees, shrubs, and plugs can occur either after the onset of the fall rainy season if , container plants are used or can occur in the winter towards the end of the season if bare-root material is used. Either container or bare root can be used, depending upon seasonal..availability and conditions, Smaller shrubs and herbaceous propagules will be installed in groups at moderate densities in random placements. Invasive and noxious species will be'removed from the wetland and buffer mitigation areas prior to plant installation. ' Fishman/SWCA ' Project 03071114170-199 14 1 ii Wall Street Joint Permit Application Compensatory Welland Mitigation Plan • Permit Modification,November 2005 Table 3. Wetland Planting Mix • I • Scientific.Name Common Name Type Rate/Spacing Location* Quantity IAgrostis exarafa spike bentgrass seed 2 Ibs/acre All 1.5 lbs West Pond 75 I . Carex obnupta slough sedge propagules 1 ft centers in groups of 5 East of West Pond 100 •East Pond . 100 IEleocharis ovate ovoid spikerush seed 2 lbs/acre All 1.5 lbs Hordeum• b a hyantherum meadow barley seed 12 lbs/acre All. 9 lbs j Juncos tennis slender rush seed 1 lb/acre' All 0.75 lbs I Lupines large-leafed seed 8 lbs/acre All . .6 lbs I polyphyllus lupine West of West Pond 100 I Scirpus small-fruited 1 ft centers in microcarpus bulrush propagules groups of 5 West Pond 75 East Pond 100 I planting mix to be seeded In.all wetland mitigation areas and temporary wetland impact areas.Distribute seed . • uniformly over the designated area and hand rake to insure that seed is firmly in contact with the soil.Slough sedge and small- fruited bulrush to be planted in central depression areas in wetland terraces to be created east and west of the West Pond and • in reconfigured West Pond and East Pond. 1 ' • Table 4. Wetland Tree and Shrub Plantings . Scientific.Name " Common Size* Spacing .Planting Location Quantity I 'Name Acer circlnatum vine maple 1 gallon West Pond(149-150 ft) 10 5-8 feet on center perimeter of East Pond 10 I . . (139=140 ft) • • Corpus stolonifera red-osier 1 gallon 5-10 feet on top of stream bank 100 I [[sericea)] dogwood center Crataegus dougiasli black 1 gallon 10 feet on center West Pond(148-149 ft) 5 hawthorn perimeter of East Pond 5 I (13$-139.ft) Fraxinus latifolia . Oregon ash 2 gallon 15 feet on center West Pond(147-148 ft) : 20 • I . . East Pond&wetland 30 • 'restoration area(.136- 137ft)/temporary wetland disturbance area IFishman/SWCA Project 03071110170-199 15 Wall Street Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification,Noyember 2005 I Table 4. Wetland Tree and Shrub Plantings Scientific Name Common Size* Spacing Planting Location Quantity ' Name • Physocarpus capifafus .Pacific : 1 gallon 5-8 feet on center West Pond(148 ft) , 10 . ninebark perimeter of East Pond 8 • (138 ft) Rosa pisocarpa wild clustered 1 gallon groups of 3; West Pond(148-149 ft) 20 rose 1 3 feet on center perimeter of East Pond 15 (138-139 ft) Salix lasiandra Pacific willow 1 gallon 10-15 feet on top of stream bank 50 1 or stakes center Salix piper! Piper's willow 1.gallon 5-10 feet on top of stream bank • 70 1 • . or stakes center East Pond&wetland 30 restoration area(136-137 ii ft)1 temporary wetland disturbance area Salix scouleriana Scouler. 1 gallon 15 feet on center Wetland restoration area 30 willow or stakes • (137-1.38 ft)I temporary I wetland disturbance area Thuja plicate western red 2 gallon 15 feet on center West Pond(149—150 ft) 5 1 cedar . perimeter of East Pond 5 . • (139-140 ft) *Bare root plants may be substituted for container plants based upon seasonal availability and site conditions. I 4.8 Mitigation Reference Site • I A combination of reference sites was utilized to assist with design of the mitigation plan to be consistent with site conditions typically found along smaller Fanno Creek tributaries and in 1 associated wetlands in the project vicinity. Reference streams and wetlands include Red Rock Creek, Derry Dell Creek and Ash Creek.. _ . III 5 Mitigation Monitoring A post-construction report demonstrating"as-built"conditions including grading and discussing I any variation from the approved plan will be prepared by a wetland biologist and submitted to DSL and the Corps within 90 calendar days of completing construction. In addition,monitoring will be conducted by.a wetland biologist annually for 5 consecutive years,beginning the first . 1 year following completion of construction and installation of plantings. Monitoring will take place during the growing season,typically in late spring/early summer. 11 . Fishman(SWCA • Project 03071110170-199 16 • 1 Wall Street Joint Permit Application • Compensatory Wetland Mitigation Plan IPermit Modification,November 2005 • Monitoring data will be collected for the following parameters: ' • The presence of field indicators documenting the presence of wetland hydrology and vegetation(the presence of wetland hydrology will assume the site soils meet the hydric soil ' criteria). • Photo documentation of the site will be provided from permanent photo monitoring points strategically located in order to visually document site conditions during the monitoring ' period. Photos will be taken annually during the field monitoring and presented in the monitoring reports. • • Wildlife utilization will be recorded during field visits and summarized in the annual reports. Wildlife utilization will include the siting or signs of wildlife in the area recorded during site visits. • Vegetation monitoring will consist of annual data collection from block transects. Transects ' will be located to include a representative sampling of all plant communities•in the mitigation site. Transects may be revised in number or location based on adaptive management during.. the project monitoring period. Parameters recorded will include survival of planted trees and ' shrubs,presence of plant recruitment, growth and vigor of the planted trees and shrubs, percent herbaceous cover and individual species present, and percent invasive species cover and individual species present. . 6 Construction Schedule ' Table 5 on the following �a presents a conceptual schedule for the mitigation project. The proposed schedule is subject to change,but provides the general sequence of events and tasks that may take place in the course of constructing,,rnaintaining.and-monitoring the wetland mitigation site. . • • 1 1 1 Fishman/SWCA Project 03071/10170-199 17 . Wall Street Joint Permit Application • Compensatory Wetland Mitigation Plan Permit Modification, November 2005 I Table 5. Conceptual Mitigation Project Schedule Task Estimated Completion Date 1 Site prep(take ponds off-line from Pinebrook Creek,:. Summer 2006 procure plants and seeds,etc.) I Site grading Late summer 2006 Site seeding Early fall 2006 Site planting Fall to winter 2006 As-built report • Winter 2006/2007(90 days post-construction) First annual monitoring Late spring/early summer 2007 1 Maintenance site visits Prior to June 1st&prior to Sept.30th,2007 First annual monitoring report November 1,2007 I ' Supplemental planting/seeding (if necessary) Fall to winter 2007. Second annual monitoring Late spring/early summer 2008 I Maintenance site visits Prior to June 1st&prior to Sept.30th,2008 Second annual monitoring report November 1,2008 1 Third annual monitoring Late spring/early summer 2009 Maintenance site visits Prior to June 1st&prior to Sept. 30th, 2009 I Third annual monitoring report November 1, 2009 Fourth annual monitoring Late spring/early summer 2010 I Maintenance site visits Prior to June 1st&prior to Sept. 30th, 2010 Fourth annual monitoring report November 1,2010 1 Fifth annual monitoring Late spring/early summer 2011 •Maintenance site visits Prior to June 1st&.prior to Sept. 30th, 2011 Fifth annual monitoring report November 1,2011 . . I ' I 7 Maintenance . . During the 5-year monitoring period, the city of Tigard will be responsible for maintenance of . I . the mitigation site. We recommend use of a landscape contractor experienced in maintaining , wetland mitigation sites. Maintenance recommendations for corrective actions will be included in the annual wetland monitoring reports, and these actions will be implemented as needed I throughout the monitoring period to ensure that the success criteria are met at the end of the 5= year monitoring period. Maintenance tasks include,but are not limited to,minimizing water stress of plants during the first two growing seasons, inspection and repair(as necessary) of I i browse control measures, installation of supplemental seed or plantings (as necessary), and ' identification and control of invasive plant species. I Fishman/SWCA Project 03071/10170-199 18 ' • Wall Street Joint Permit Application Compensatory Wetland Mitigation Plan Permit Modification,November 2005 Irrigation will be used as needed during the first two years of plant establishment.AU browse ' control measures will be inspected annually at a minimum during the monitoring period and repairs made to keep them in functioning order..Supplemental seeding and/or planting may be necessary within the mitigation site during the monitoring period, and there may be revisions to the species to be replanted based upon hydrology of the mitigation site. Supplemental plant species and quantities will be based on monitoring results. Invasive species control will be . conducted at least twice per year,prior to June 1st and prior to September 30th. Target invasive species include,but are not limited to, purple loosestrife, Himalayan blackberry, bittersweet nightshade, reed canarygrass, giant hogweed,thistle and teasel. We recommend referring to the Clean Water Services' "Integrated.Vegetation and Animal Management Guidance" (CWS 2003)' Ifor invasive species management strategies. . 8 Contingency • • If the mitigation goals are not met at the end.of the 5-year monitoring period, contingency Y • measures will be implemented to correct the deficiencies. Initially,project deficiencies will'be assessed by wetland experts in order to determine the appropriate response(s)to the problem and to discuss these with the regulatory agencies prior to implementation. Contingencies may I include, but are not limited to,planting additional vegetation,performing weed control, performing herbivore control,modifying drainage features, and adjusting site elevations through grading. It is likely that some replanting will be necessary during the first few years, and there may be revisions to the Species to be replanted based upon hydrology of the mitigation site. Recommendations for achieving mitigation success will be included in the annual wetland monitoring report, and these recommendations will be implemented as needed throughout the ' . monitoring period to ensure that the success criteria are met at the end of the 5-year monitoring ' period. 9 L ong-Term Protection & Security Instrument - Long-term protection of the mitigation site will be ensured by placing deed restrictions over the mitigation site.The mitigation site is located on property owned by the City of Tigard and the Fanno Pointe Condominiums Owners Association. A financial security instrument to ensure compliance with compensatory mitigation requirements is not required for projects conducted by Igovernment agencies according to OAR-141-085-0176(2). 1 i Fishman/SWCA Project 03071110170-199 19 1 p�ae / �� :fie-9�. '7'I � ,. 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FT. . \ [ 100 Year j ' ��S. � Floodplain •f WETLAND IMPACT �\. • • ` ; n a °�� WALL .STREET EXTENSION (PH. 1) S•APRLICANT: Ctiy, of Tirid �` c$ ur ^., ssociates, Inc. x Vanaie Nguyen,Engineering.Manager ;r TWA. `' _'°� �'"''" " STREET 8 UTILITIES IMPROVEMENTS , x WO ” ° cm of 11GARD : • OF a� X a:\onr WATERWAY:Pinebrook Creek&wetlands ,a oua.r» °°'` ME AuG1rSt, 2005 ,u _ oz 118 Game�run�rr I ACTIVITY:Wall Street,permit modification . DATE:November 2005;SHEET:a of 7 . . - •• • , ...-.„ . ,..... . . • • • • . . ‘•'..-., ...,_.• - . • --. . • • . • . . • . , i i . li " . i 1 1 i I . i! • . r ! . r iii I • . • cr_ . ••••• Ii . . . . . . . • T. ...,,,.. i ., I . . . ul ..i I • A-.: - :-:T----We-- . - -A 1'‘ • 1 !• *z 1't 1.• . ./• • ! : ;I . • . • • ( ! 1 I ii • . . i L • i 1 • • ......-----—.....—,---"'--- -- -: • . • 1 1 i li 4s ..------ . • ii i . . 1! I. • _______....----,---- ..:. ,......*,..-ITY• \:\z,k II ! . 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IMPACT • - • . i i . . ......___ • . . ay. 12/3t/OJ DE HAAS sa,xo-•X 9.4 • 1 SHEET. • clew ss Inc. $"4 A.• WALL STREET EXTENSION (PH. 1) . .°elates x . - APPLICANT: City of Tigard Vannie Nguyen,Engineering Manager WW1 em" Lb. 1.(t .'N 'CD=99 94 — WATERWAY:Pinebrook Creek&wetlands' c-'4 "9'M' 11:1•:1\:,.........,/,;$ DM MARCI4 2004 , toghwasfaeseing •Scrape. . . 99.9 9•9 99-2•9 .1:3144 STREET & UTILITIES IMPROVEMENTS _x -.19 42-40•6 1 02629.1.'18 • CITY OF TCGARD ING•4179•C 01349190fT - X • OF - X ACTIVITY:Wall Street,permit ritoditication • . . • . • • . .. . DATE:November 2005;SHEET: b of 2 !: •- • ,. • • • . • • . . . . . . ... . . . . . • • . , • - • _ . . . •- . . . giN MI INI MO ----- iiii INNO ONN ille Iml - an ' . 1- " ''‘ 1`. / \ . . "i \.\\ • • 119!. i:. :�-..` \:%Z;" •,t I \: �• :\ /// f•4�;�_tom% .,� �;l I \ \ \ ,-• it f Yi: f , • Nt • f :1-.- . e.- i ' • 1..P., • .. 1/f / r t 100 YEAR \ i \:,r, t';yrr\ \ \�-� \FLOODRAJN• . 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'.: tt_ a�,r: t I t 'a;�'ii/ = _- � EXIST. r i,' , •\ � \ L 5 !t t_w t / j� • WETLAND / /%/„ \• • ',11.'"?'' //j/j'</ 11 ° y�r ��jlf 100 YEAR ! \\ \'\• I f , ' »` ' FLOODPLA►N• I ' EXISTING • CONDITIONS ' - 1-- • . e• ,ys„a, E HAAS — 1 • Suse'r B �� °�°- WALL STREET EXTENSION (PH. 1) x APPLICANT: City of Tigard `”'°" w �`��; ssocia#es, Inc. • :04D om no. `°°'"°"'""` a""7 rw.t00Ur-20, ,,`. :' j'1 STREET & UTILITIES IMPROVEMENTS x . Vannie Nguyen,Engineering Manager ,c . CM AS 3.0)1.1 are co TIGARD r .O F WATERWAY:Pinebrook Creek&wetlands 'x""'"^a•"" • 3.+,c zoos I.` az629 ate o . is ov.R,m* x •ACTIVITY:Wall Street,permit modification . • • DATE:November 2005;SHEET:3 of. - • • • •. . . . . • . . . . . . . • ' . . • • •• „ _ .. • • . . . • • . .. •. • t '. . :. ' • ' .:-f.,:,'„',.:- -7"--f•-•-•--v.. '-.7.-,7.--• .„....-7: '--„•-•,--:•;',.":1,0-7-•-...f...,,,,,,,,, ,•••••°- ,„.7-SP---,-,......------ --.••••'"------"r i I . : , . •i---&-,_ ,' / ; • ..„ i : „ .: . . ' . 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I : 11 MIMI 1.01 - 03) \ ; , \,, 2. i, / 1,5e„., "■0 1 / • .c.:- ,NI i ti 1 1i ; ; •\ •...., 4s.,-- .:-..'";,:,„.:-.. .,"`"2 :,..„-',.=.-.:.---.N■,,,,_./ 0 ••'' . .- ... v• \ ; './ ; I . I \ , r, •• •.•..:,---....:,...:==:::,,-7-...°--•••-.3....... -•:.,-:`-7 i \ .--,-.. -•,......... •----.,..-_:.-....---s.,....---2.,„,_-.-....:-......,J.E.-.,,-- -.....--._-_ , . . • ) i , •' i • Ve:-...,L._1 __ -.,_,.._...,... . • :: .g., F-1:.%! i. IIIMENIJAMILVEhl 'r ' `% , , ) ,/., Li..arit A 1 : -,- .......,„.......„...-- ...........7.„."--,-,,7,.........,........ .. .......:\.,,,,\ A • S GHEE)ui.E. 0 . _ 1 _ . tap. S.?-1,/i25 DE HAAS ,.Oxeme•ca Gek • , , ana A Cem odllsg leasstteaess l e Sams.. „4. • •' SHEET APPLICANT: City of Tigard 1 • cis nA WALL STREET EXTENSION (PH. 1) R1 Vanne Nguye0,Eigineerog Mger STREET & UTILITIES IMPROVEMENTS 2 . fax 132-4015 • • .........._...9:17....",.. RE LOGSSIM S:N. WATERWAY:Pinebrook Creek&wetlands ''''''''` Noy 2005 • , 02528:118 OTY OF ITGARD DaTeEEPSSIG SeirDARSIASMI • WETLAND MITIGATION &STREAM RESTORATION KEY MAP • 2.1 OF • •34 . ACTIVITY:Wall Street,permit'modification • • . . DATE:November 2005;SHEETS a of 3- . • . • • . . . . . . . - . . . . • • • • . . . . • • . . • . • . . • . . • . . ., . . -- . • . . . . . .‘ . . . . , . . . . . - . . •- • . • . - ---------- - _. • "-"*„.. ' . • • . . . • ... , .. . . . , / i ' 71 7// ' • . . . • • . . , . • ---.. . 1 . „...... . . ... . .. .... f..t- c ..... • . • /f • . 1'11 . 1 ' •- ._. „c., :••••••”A • • .. . ....., ......_ . . .. . ..., • ... , ...• / Af v // ./, .!,,,..;.removed.eVC .• . -• . .'' • ..•• '......... ..•.. .• • • ...„.......- .-- ,..., ...... , ... . • ......._ / Yi , /c/// // See Detail ' • • • . -,-, . • ` Iv . • .=- . ......\ ' ---..c*,,,,,. '.<7.1 -----___ -,-------- ---,..,.. / .,::". , ,f. -....e ..--:-...-----. . • n .7••• .5° ..7`.6 - ...`"‘ \ --/-/ - -----1.• $ .1k•■••-- ..- *114t4 • 44/4.-- , • z - / //Z.-- "..4.7%- ' .. .6‘' :,,------44-•,. aq, •". 43- 02. ir , •. • ----;-.:,`, "--- -4).3 1.-43. „..ri 4.-- 0,,,, ,,,g,),,, ,,,,,,,„„„,-_,.....,„___ ....,..., ..,,,. ,,, 4...0.- 1--- i... ■ - ..Y q fil jr./A1 _...,pri---- ,ilt • ,... Ag-.---4.4./.■ ", , -,':' '. ........, --... .- ....-----....-41/s.4 Iffai. -Ldr-,4" „„,,..„ 4---- ---- -.i / / •4454-, ....— fa, .i ... ._„...4 -10iiih... ---- -------- ,,,,-..,,_,„„3..._ •-. , ./ //// - --.300C/Idelts ••"''■'"A 141111011ratt wit r 4■116, ./..doritnii ...........„ ; . ■fr--4-,s--- _____ ____ _______. _____•-•-_,.-------. ------z----- .\-.1:--St) --..../ ■ ,1 Az _ . • •,Z • 4%. ..":1-.q CO . ../. .. 1 -------- --• , !------- See . • ••■.. e. ' 'V • 0 am.a 28.46" -.41 tan, 63.09 • am..WS*tnee tn..irr.r.frurt c'esit ----' ."--„, .. fleets.R7 and R8 . E,o ast. ir a t be ren■ea .• al lama 45.34* ire-4n..48.05\ . - for typical details- • . ,... • , . , .... • . . erg..te541,040.7 tarc:a.4,476•15'34.-E . ,, -..., .— ____ -- ' • • • co,....- 30. -.-„, I -A.— -- --- .... .... _- •.... .._. . . _ .. .s. . ...,b,... N1'10.5E ....... .:.: .: •,.,.......‘.. .. • ■.,... . / z ... - ' - _,C‘..."-1 ..... .* N Irkk....„%.,..:i ,r/ ..,.._ . . -- .:''. ' 4...5- • t i I it '.-•; CS _- 31b..:=" .. -e-' . . . .-- • • . .- • • - , _ 160 ortgind ground I 160. .• _ o • • • •::..r.r-, +S ig 5-4q • . ://r 8.0 o N . • _ oo • 5-:a . — 1 155 ..... - Vz,D. , , c,_ Rough grading CA - tocae 4?,,w) .1 . I . — --+.• • 150 • — SI...0 0500 - / __--- ...... __--_-- -------------..-----__ 145 .... .......-- ,_„:" ,_ ' s.N..„., -• -el 145 pRopmx . • si.- 0,0042 I ...—__- .v oh grOde (T)P) SI. 10-0500505 140 Wet 7--.•t r - , 140 0 CV CV ,... c•1 • el r.- . o ' .n . ca . - .. . . . • o ;71 al .r, .1, .! v- V- ' .- n et. e.- Om . i ..... .1., ...1 . I ai cd co of, tri oI tri . co af, aS ai ai .$ — a• a a a , •■• •e• . ." e. .er '`," ". er •- - ... .. • 0+00 ' 0+20 0+40 0+60 0+80 1+00 . 1+20 1+40 ' 1+00 - 1-411--- 2+00 _ 2.20 • 2+40 2+60 _• .-e0 SCHEDULE 0 1 1 a /Ps. P.Z.,""teg .D E HAAS S..Xa,-cCC ioor. 9.50 5,..Cow•or r.,... SHEET • — , ,....._ev.er idihm van...0.....94.0 • APPLICANT: City ofTigard 0.. 0". ssociates, Inc. WALL STREET EXTENSION (PH. 1) R4 • I Van=Nguyen,Eugineenng Manager ...-7-3 5i2 A- Ceeettlet fleemen 4 Sepery.e. I . • ..xt POP WZ-201 . r.t .'''2iP . STREET. & UTILITIES IMPROVEMENTS VAC LO-COM 24 • I . • .na owl:. WATERWAY:Pinebrook Creek&wetlands ---37."- 44ms-to's .c„,, ..4.1.4 2005 I ME 02 529.118 0 TY OF TiGARD PCrtrelec Onewasorr • . STREAM RESTORATION PLAN& PROFILE - OF 34 ACITVTrY:Wall Street,permit modification • . . ' • DATE:November 2005;SHrEETS1 of.7. • . . . .• • - . • . , . . . . . .. . . ... . . , • . • . • . . . . . . . . . . . . . . . . . . .. . • . . . . . . , . • . • MI MIN IMIli MN MN IIIIIIIII IIIII MI MI IIIIIII alli 1111111 illi Will IIII. - --, . ,t� / J! 4� • i Jv- -- - ••• ....011111. . • / . r iN , __, .. T 4$ I CA „'o S� — - y \ �•.t � ? �+ '��o a`qo '-X39 l 146`yft.• `:\ • '� 6' �.- ', %$�'' t;113.. :II;""i ! : \ • • • • X 11_ Ili �- -••!♦1-t- ,/ /.ss Q� ?, \ . �erode C/L `�ti• 0 • . 1 \ - --- '.l s > 'I _ . , -- .,_____ N \ • ' 1 tA4,''..:sl•3 -01‘ 1 L N, .y J �; See sheets R6'no R. \ �,- O• / soot.-r mow. `� ` \,% for typical details, \\\, t7 04'j E 1177 � Nom,_ , O ,` E •1® rod.- 79�' r • 0Onion i - /�- tar.- N3r2j '- j c _.II "`L�• �p erg.� N3S2r2dW ' .'i = \ ll I . • ' '_fi; \ l •. 111Moil 2e o ME El®- (PrO'E Wa n:..9 �I °l8 I °o .4:n•MOM. i '1 ''.'''''' MEV= .3 04.00 Y — CUP. •x_000 r - _ �r�-fiIE311111_�_1�� 1=0.0 • -=V 03 3- t£- 139.50 'ea^e 135 - 3*65.5 1 �o a (�)7, . 1e.. 1•S.50 1 1 II 130 t ' PROk/LE • 130 • • n n m .h h N N 1 n 11 N O N .Y(! Y S N .A r N •• • .j f Y Y V Y ' = ..n '4 h Y1 I Y, r g n n 1 • 2 80 3400 3+ 3+40 3+60 3t80 4+00 4+10 4+40 .. 4+80 5+.• . 5+20 _ . SCHEDULE C3 • 04/Z i%C...... 1—1 — u 40. , ,as V.MO•..G Om... DE ..w:.....�..cm. SHEET sant APYITCA.'JT: City of Tigard 4,,, ,,,..:. _ ssociates. Inc.........o.....Inn WALL STREET EXTENSION (PH. 1) R5 Vannie�Igayen,EngineeriagMan er -� _ « •.,,,,,,,,,-,,,, A. 79� STREET & UTILITIES IMPROVEMENTS CITY of nG�tD STRF�Il1 RESTORATION PLAN 4 p ocit OF 25 nc.«.tio. WATERWAY:Pinebrook Creek&wetlands* .:.,.► „� A"9— ar 20x5 j 0?-629.»a r s� ar..�.v. 34 • ACTIVITY:Y:Wall Street,permit modification . . DATE:November 2005;SIIEET:�G of • • • . ,.// .: .J • _ / NY')._..-- y 2j I ` V- PLAN ki ° MN ME 1/111 Min MM y � 41- - 0 30{+a 0" I arr, •.■ 4. ' • „. '',. . . f. �. ! v 7 '�_ iiii i �° ¢ 0 `�....�� " /135` I Modify,existing channel I IIII �I /) os per fi engineenng 51yt / 1 • Rwgn.grade clL ^ �� ` \\\�\V I J ,- See sheets R6, R7, and RS \for typical details `~/ Limits of modiftcaGon \\\:. . ®k..3o.es' •:4,/ erg•. n35'27'z61r i,�� - e,... 61.76• : —--—�—— — —� t • L b9•• M3Q36't6lr 1 ,``, ` \ \ - ®km. 133.76 !! �`� _ `�- \• 1,6.N74-11'04"r \`1 L35 -� . s-.. .---- ---. \ • ... c- .--- -- _ —:::"...N.. ."—Az_—_,— --....----:-'4-4,c^......--z---_—..-:,„ . _ ' - f • '''',■-•. . ( • 145 n Rough grod�tig C/L_ (Prone geode) — 145 ;A 140 ,n 6: °o O,igireol y�wrro $ _ L! .+n s-: 140 a 0500 - • SLa 0.03125 0.010• St� 0.00°- ____--- -- _-• ' ,35 136 Finish • ode(T:p) I I Phtrs7LC _ -150 - - ' :cow r 436 I 125 Wi ti m. m .inn n n m ,ten n • O m l io .p r•m • 120 ^_ =' = = n n n, n n n h I _ F� ~- X20 5+40 5+60 5+80 64-00 6+ 6+40 6+60 6+80 7+Z10 7+20 7+40 • om. 'w L_ 1 - -e - — . SCHEDULE 0 e". ' '� DE HAAS o is"-w SHEET APPLICANT: City ofT and — r�'c "�. k ""`°...MO A WALL STREET EXTENSION (PH. 1) R6 ty 'g1. ssociates, Inc. VanmeNguyen,EngineeringManaaer `~""" � ,�„„ ���'"ry��y; STREET & UTILITIES IMPROVEMENTS `26 t 07Y Or 11CAR0 STREAM RESTORATION PLAN&PROFILE OF RE LOCUM WATERWAY:Pinebrook Creek&wetlands „r �WC t zoos 1 q. oa 629.1 M pro «IGAR,r 34 ACTIVITY:Waft Street,permit modification • • DATE:November 2005;SHEET: of • • Sal U• - MI - - NM I • �_ �r • r r a MI O O O O O G O O • MI' . O O O O O • O O. O • • .—.•• -r—i- i w.ua./ i 1 . i sz 1 1 ' i ∎ i , STEP—POOL SECTION E—E • . ! s j Yt. . wz fir '—E,+ —' i 0+70 cft wrm CA.oa ,.roues oval c t•Fes• UMW:,RAMC st � 1�,,o, ��sa.xal�im nvrwe mod • • 4 r! ```999`-1• • 60+j8 0 W,, n F-11-- •• •• 0+60 • WETLAND TERRACE SECTION F—F • . s, I 1 1 1 P.id } i Rough grade C/Y 1,0) i • - MO' ,s. ts -_ - Lr± LTcIT• Profile i -i 04.50 t&5 T. Ot50 _ i , I1 'o 1 � PLAN VIEW S2_ • Wet/and Planting Detail (6,1e) Scale: 11b 6' .S°'� ,°6' scotr: , E• SECTION C—C • Station # (Wf T/. SR) . Elevation . Profile grade station cal/outs depict grade control for preceeding'stream step pool and wetland terraces. The intent of the design is to depict a natural oppeonng step pool stream with adjacent wetland terraces. Note: Step pool flow line is 1.5 ft. below profile grade stations The step pool stream and wetland terraces are to be constructed by excavating depressions u, the directed W-C/L Weir Position T- Weir Type S- C/L Stream Position location, leaving the original undisturbed berm material in place. (See Sheet R7) (See Sheet R8) (See'Sheet R7) ' Disturbance or placement of material within the weir or stream/wetland berm is to be compacted to in situ cond7ions. 'W7- 3.0 ft left • Ti- rock SI- 30 R left ' Deviations from line and station-to take advantage of natural breaks and material in place (depressions, root wads, etc;) t 2- center 72- notched log 52- center ore encouraged with approval of the engineer. •W3- 3..0.right T3- Y log 53-•,i0"right Deviations from the shown dimensions of_{.10X are encouraged to soften all fines and breaks to a more natural condition. • T4- root wad St- transition Weirs are to be placed as shown. Step pool inlets and outlets to weirs one to be•rounded as depicted in the details (1.5 ft rl/tt)75- rock/lag Changes in weir types during construction to take advantage of existing'conditions or to facilitate a more economical•• alternative. white maintaining stream diversity, a encouraged with approval of the engineer • Sir c.,.. r.z/Jr/u1 rcatesnc. 'f ` SHET • ' ER5 Z.11). A. STREET & UTILITIES IMPROVEMENTS x amp WATERWAY:Pinebrook Creek&wetlands "` "°"` `'ea•= CITY of TIGARD STREAM sroannox oEntas OF x a[c w.c"" „. ova[ 'A? '2004 I n.c o?.579.118 , tm4.111a.c oFr■.M.r ACTIVITY:Wall Street,permit modifica-tiion . DATE:November 2005;SHEET:(va •7' of • 3 — 1 0 --K 1 . . , zo. i , 1-5' f 7.5' L so a ab' ao' i D '_ A ..o.....0.. sa'or 30.L . .j . i . , ....4..... 7 _4 I__ t:i ' ' -.IP . L- i u'•der /O' w Fiasco ca+4ol lq c ros ar con S d long_Pa s/$'Iole!Inv both E3',ide r 1:07:b7,[ Erosion euG Maio PKas and insert o T1- Rock Weir Detail xO-^'i^- ;;°, (Op) Score: 77-6-0' • s O' T2- NOTCHED LOG DETAIL T3- "0" LOG DETAIL grade ond �a Sc.*:7 5=0" • Scat J1 5'-0" f I a I Roan s ee W I ! i b '4ta irillA. F' _ lot— I———F----- . Mkt 6"d f a r 4 0'lo J iGn 6"caa. r 4.0'kuq - o Erosan control I Me 5-10 5'70. 35'r 10' t/a°'at 12"clia al eeb locator's. Erosion control fabric Ian' ; . • T1- Section A-A I'a�70' at T2- Section D-D , • • Sca/c 1".6'-O Seolr. 7 a 6=0- 1��\ �4 Thar ' \—#4 royal - 13' 15' 2 I L5' 1 ;f 1 rS' . 8"a:a.r x0-log . C C (< �?° - • .1 So. SO'or x0' T3- Section B—B : i . ' 1,A - I �� F'� - Nate: t Jz See Plan Sheets R2, R3, R4 and 4' r 10'Iona l 3 J3'nee r 10 long I Rool,. Erosoa contro/4obn�c • Detail Sheet R5 and R6 for • ,eao!'°° Erosion control fabric Weir/Pool offset dimensions. T4— ROOT WAD/ROCK DETAIL ao• Scot:I_6-0- T5- ROCK/LOG Detail 4 • HMde grads Sc'afc , 6�0" • JS"le; !6'roar I Roagh prose G/L T h oalb sale c *rm. • ��� — 6 ter, lo' T5- Section B-B • T4- Section C-C s 6.-0- - Scok /...,,6'-0" - cow. 1&MOM.. 1 i r.-.- DE HAAS s zo_a`— SHEET •4WD et. IUD 12/J1/0.1 � ; �°°� WALL STREET EXTENSION (PH. 1) R7 APPLICANT: Cry of Tigard .,■* u, us="� 1 ssociates, Inc.Vannle Engineering Manager "°'°" "'a 7,1,z, ° »n[Pwn�-za�a l4$'' STREET & UTILITIES IMPROVEMENTS X Nguyen, g u-a-a ,a sc�ou LC ea VOW. V.7,,,/ CITY OF IIGARO STREAM RESTORATION DETAILS : OF F WATERWAY:Pinebrook Creek&wetlands -cc'ND•�-I`� Ji w�¢ A[4.C!J 2a 4 MC o?629 178 d sew«. _ X . ACTIVITY:Wall Street.,permit modification , • • • DATE:November 2005;SHEET: !)of 7' - .• i I MI • - • • - • ! M - N O G= D G= i i = i i • • i i i i i i i i f . Rough grow CA !t_R , aD6 gWe C/C s If Rough g CA Pid.M 5...-01,5- ., tI ! ws{s { 1 �• 1 cr I 1 Pmr✓s glad. crt yf I �, `..r'' 1 /i t - u ' ! � , a3 WI Ia6 234 S4 SI Ste , 6• Scar. 7 6• • R 6 �r/gI�Rough g d CA aor. d• — C/LftiRgy/ rods CA I . A-__- ... / 1 1.-- ,... Iy II 3 raD• 7.0.. �• Soo,c !.•6• 75.7 Shale: l'.6- 52 Sea&: !1 6• Rough rode CA—N ! Ro,pn gro0 CA 1 ! Prota.0� w ai .r I Q T �. �� _ W3 Sou&.• !-6• ne 53 scat.-S17.6" Soar !-6• Weir Location Fish Stream Details (See sheet R7 for • weir type details) Ex" uaiar DE HAAS SHEET APPLICANT: City ofTigard �� ,� ,ra� �:. WALL STREET EXTENSION (PH. •1) R6 Vannie Nguyen,Engineering Manager ii a�v �,' ssooiate s,Inc. A,,;no, . �„ o _ STREET & UTILITIES IMPROVEMENTS WATERWAY:Pinebrook Creek&wetlands. r.s vo— ae CITY CC TSCARn STREAM RESTORATION DETAILS OF cca nn=MISS_ y� MARCH, 2004 I,� 02.629.118 oaa,manc cc9.awwr X ACTIVITY:Wall Street,permit modification DATE:November 2005;SHEET:4C.of 7 • • Chas/IX'0-mo(000T Sfd) . 1A 2 rant*9rp r- H� �ar and n M opv ps(amas e)d . i- a — . Ain. 7'war •7 IMO •• ! i _ ( _t r^ ,..-'...s • � ^ �,� f '....4,--...'"i � ter: P. `_ec. .• • ., 4 ,;.-,,•_.>- /` '- - . Rip-Rap End Slope-Detail . • EratyporA STi J6' - . Hall Blvd. Culvert- Outlet Rip-Rap . Sevf.: rS 6-0- • •. • to- 1 • Stream d,97o f - ..1 • 1� NHOwwi9 WO Shwas/Ie�Fa� - IiQJ KLS :M '4' 4 ti•i ,i..J •G. - -9-.• .:r^"r:1-t... - _ _ ry J +1-a� r Z)__r t f rz X? .s -0 i GR"►" /gray,yoa,c/c"• � a=po• r?S' r7.5' f 2-z�J iz- IR.:..r'ra . 9ar'e^s 7A'Mk Gass/709 1,1,,,,,,s. Ctrs:,/700 • Fanno Point Culvert `'° Seayc!'+6' aw-R6na(aaor Std.) Pa OK 6 /J{a-arn(WbT Std) • . Section H-H • Srna: ,-6'-0- • • • • - SCHEDULE Q wac I a _ to. �J,� DEFIAAS s:so i r....:o.. SHEET APPLICANT: (Sty ofTigara — ea/� z ssociates, Inc. ��' WALL STREET EXTENSION (PH. 1) Rs VanaieNgnyen,En�ineeringirlanager — °°'"'t7^"'""'s�"' _ u?!j'�4� STREET & UTILITIES IMPROVEMENTS +tee amt w rsr 29 �.ar WATERWAY:Pinebrook Creek&wetlands .0- STREAM °� OF r _ _pat August. Zoos 1," , o1-sz9.„@ via�x.�c evrauo�. 34 . ACTIVITY:Walt Street,permit modification • DATE:November 2Q(IS;SHEET:44 of 7___ • I 111111111111 11111111111111 MRS 111111111111 SEEM 111111111111111111111 _.K�Irr'rrrr r■ 150 Ali ' $7,05 a 87,05� riiii_ - a r•anni ' in,40 IIIIIIMPIA11161111.1111.111111 1 E A-A I N 150 14ii r rrrr Y1P. IEl■ 150 la .■ enwesii10 r111. I iiii40 �rrrA ,m1111111111 140 RM. al III EMI Sag■ I SECTION B-B 111111111111111111111111111 111111111111111 1 1111.1111111111111111111111111111111111111111111111 I iillinalleiN "7 ENNEIMIN 4° 11140 1N1111rr111111111NE' ,o , I 111011111111111111111111M1. NM 1 SECTION ,C�--C Proposed Stream and Wetland Mitigation Cross-Section Elevations PLICANT: City of Tigard annie Nguyen,Engineering Manager WATERWAY:Pinebrook Creek&wetlands CTIVITY:Wall Street,permit modification ATE:November 2005;SHEET: of 1 ' OLD J ka mit Maim M. a _ -a. • Geotechnical Investigation I Wall Street LID Tigard, Oregon IJanuary 31, 2003 i 1 • 4� SHANNON F�WI LSON, INC. At Shannon& Wilson, our mission is to be a progressive, well- managed professional consulting firm in the fields of engineering Iand applied earth sciences. Our goal is to perform our services with the highest degree of professionalism with due consideration to the best interests of the public,our clients,and our employees. • . . i I Submitted To: DeHaas &Associates, Inc. 9450 SW Commerce Circle, Suite 300 Wilsonville, Oregon 97070 By:. I Shannon & Wilson, Inc. 2255 SW Canyon Road Portland, Oregon 97201 I24-1-03206-002 • 1 SHANNON iWILSON, INC. FASEATTLE IRBANKS ANCHORAGE �' , GEOTECHNICAL AND ENVIRONMENTAL CONSULTANTS DENVER SAINT LOUIS PORTLAND • January 31, 2003 DeHaas&Associates,Inc. 9450 SW Commerce Circle, Suite 300 Wilsonville, OR 97070 Attn: Mr. Marlin DeHaas • RE: GEOTECHNICAL INVESTIGATION I WALL STREET LID TIGARD,OREGON Dear Mr. DeHaas: In accordance with Amendment No. 1 to the September 23, 2002 Agreement between DeHaas & Associates,Inc. and Shannon&Wilson, Inc., we have completed a geotechnical investigation for the referenced project. The purposes of the investigation were to evaluate subsurface conditions at selected locations along the roadway alignment and to assist with the design as it relates to earthwork and pavement design. This report presents the results of our investigation and our comments and recommendations regarding earthwork and pavement design. SITE AND PROJECT DESCRIPTIONS Originally,the Wall Street LID project was to improve SW Wall Street in Tigard from its ' intersection with SW Hunziker Road and to extend it southwest from its southern terminus to SW Hall Boulevard at a point just south of SE Omara Street (see Vicinity Map;Figure 1). The alignment of the new extension crosses the SPT Company and Oregon Electric Railroad tracks and Fanno Creek, and it will be located along the southern boundary of the new Tigard Library site. The engineering work for this project by the design team was authorized by the City of Tigard through the 60%design with a provision that a decision would be made to proceed or stop the project at the end of the 35% design. The City of Tigard has decided that the Preliminary Engineer's Report that would finalize the I . 35%phase will be completed, but it is anticipated that the Report will recommend against the 2255 S.W, CANYON ROAD I PORTLAND, OREGON 97201-2498 503.223.8147 FAX 503.223.8140 • www.shannonwilson.com 24-1-03206-002 : I DeHaas &Associated,Inc. S NON 6 �®��ANC I_ Attn:.Mr. Marlin DeHaas January 31, 2003 IPage 2 formation of the LID. In the meantime,the City has.authorized the final design and construction of the first 425 feet of Wall Street from the centerline of SW Hall Boulevard to p rovide access to the new Library site and to the planned Fanno Pointe Center to the south. This work also IIincludes the design of half-street improvements on Hall Boulevard fronting both the new Library and the Fanno Pointe projects. This geotechnical investigation was accomplished for the first 425-feet of Wall Street. ! fl ' . FIELD EXPLORATIONS The field exploratory program for this investigation consisted of four test pits that were II • excavated along the Wall Street alignment, roughly at about 100-foot intervals at the locations shown on the Plan of Explorations,Figure 2. The locations of the test pits are approximate and i III based on measurements taken from existing centerline stakes, Elevations were determined by interpolation from the topography shown on Figure 2. 1 ii i W.C. Moe& Sons of Portland, Oregon excavated the test pits, designated TP-1 through TP-4, on January 13, 2003, using a rubber tired backhoe. A Shannon& Wilson, Inc. geologist was IIpresent throughout the explorations to collect samples and log the test pits. The test pits were excavated to depths varying from 8 to 10 feet. 1 ■ Representative samples were obtained from the material excavated from the test pits and stored in glass jars or plastic bags. A few representative,relatively undisturbed 3-inch U.D. thin-walled Shelby tube samples were also obtained by pushing the.tubes with the backhoe bucket. All samples were sealed to retain moisture and returned to our laboratory for additional examination and testing. Summary test pit logs are presented in Figures 3 through.6. Soil descriptions and interfaces on Ithe logs are interpretive, and actual changes may be gradual. The left-hand portion of the test pit logs presents our interpretation of the soils encountered during the field exploration program. IThe right-hand portion of the test pit logs shows water levels, sample locations, sample water contents, and any other pertinent information in a"Remarks"column. M\1-TAL 1lsIIared\lproJect1320013206.02 Wall St.35-lOO%1Rd&a01.doc 24-1-03206-002 I 1 DeHaas & Associated, Inc. SHANNON WILSON,INC. Attn: Mr. Marlin DeHaas January 31, 2003 Page 3 ' LABORATORY TESTS , All samples were visually examined in our laboratory to refine the field classifications, and natural water contents (ASTM D 2216)were determined for all samples. Shelby tube samples ' were examined, and in-place densities (ASTM D 2937)and water contents were determined. The moisture content-dry density relationship of a representative subgrade sample was also determined in accordance with the standard Proctor test(ASTM D 698), and the California bearing ratio (CBR) was also determined in accordance with.ASTM D 1883 on a specimen compacted to 96.8% relative compaction. Two consolidation tests were also performed on samples of materials representative of the subsurface soils. No other testing was considered necessary. The natural water contents and dry unit weights are shown on the test pit logs, 1 Figures 3 through 6. The moisture content-dry density relationship and the CBR test result are shown on Figure 7, and the results of the consolidation test are shown on Figures 8 and 9. SUBSURFACE INTERPRETATION Geology Published geologic literature for the area(Madin, 1990)describes the area of the site as being underlain by the fine-grained phase of sediments deposited by a series of catastrophic floods during the late Pleistocene. The flood resulted from repeated breaching of ice dams impounding I glacial Lake Missoula. The fine grained phase consists generally of sand and silt, and based on Madin's (1990) mapping,the fine grained flood deposits,are estimated to be about 60 feet thick. Recent alluvium consisting of sand, silt and clay with organic material is present within the flood plain of Fanno Creek, Below the fine grained flood deposits, siltstone, claystone and fine I sandstone generally in the form of very stiff to hard silts, clayey silts and clays are present that have been named the Troutdale Formation and Sandy River Mudstone equivalent. Subsurface Interpretation The following paragraphs summarize the soils encountered in the test pits as well as our I interpretation of the subsurface profile along the road alignment. Test pit TP-1, closest to Hall Boulevard at approximately Station 11+00 encountered soft to very soft, dark to medium brown, organic sandy slightly clayey silt to approximately 3 feet. Below 3 \\HAL\lsharedllproject13200\3206.02 Wall St.35-100%\ltd&aot.doc 24-1-03206-002 1 I DeHaas&Associated, Inc. SHANNON&WILSON,INC. I Attn: Mr. Marlin DeHaas January 31, 2003 Page 4 feet medium stiff/loose, light brown becoming gray, stratified organic to slightly organic sandy silt ranging to silty sand was encountered. A slow seep was observed at 3 feet, the contact t between the two units. The test pit was excavated to a depth of 10 feet. Test pit TP-2, at approximately Station 12+00, encountered soft to very soft, dark to medium Ibrown, organic sandy slightly clayey silt to approximately 1.5 feet. Below 1.5 feet medium • stiff/loose, light brown becoming gray, sandy silt ranging to silty sand was encountered. Increased disseminated organic particles were observed below approximately 9 feet, at which a depth a slow seep was also encountered. The test pit was excavated to a depth of 10 feet. 1 Test pit TP-3, at approximately Station 13.00, encountered soft to very soft, dark to medium brown, organic sandy slightly clayey silt to approximately 2.5 feet. Below 2.5 feet medium ' Qstiff/loose, light brown becoming gray, stratified sandy silt ranging to silty sand was encountered. A slow seep was observed at 2.5 feet, the contact between the two units. The test pit was excavated to a depth of 9 feet. Test pit TP-4, at approximately Station 14+00 in a marshy, low-lying area adjacent to a tributary of Fanno Creek, encountered soft to very soft,dark to medium brown, organic sandy slightly clayey silt to approximately 2 feet. Below 2 feet medium stiff/loose, light brown becoming gray, Istratified organic to slightly organic sandy silt ranging to slightly silty sand was encountered. A layer of relatively abundant organics was observed from approximately 3.5 to 5 feet. Static water was observed at 2 feet,the contact between the two units. The test pit was excavated to a 0 depth of 8 feet. I The darker brown material observed in the top few feet is interpreted as topsoil. If was generally slightly blocky with oxidized material and could possibly have been reworked by lowin at p g some point in the past. Tree roots are not uncommon in this material. The underlying lighter brown to gray stratified sandy silt to silty sand with varying organic content is interpreted as alluvium from Fanno Creek or one of its tributaries. Common organic brown staining was IIobserved in the lower levels of TP-land near the bottom of TP-2,but not in TP-3. Common organic debris associated with swampy conditions was observed to a depth of approximately 5 afeet in TP-4. The micaceous silt and sand observed is likely derived from Pleistocene Flood 1111 \\HAL\1shared1 1projee63200132o5.o2 Wall St 35-100%\Rd&a01.doo 24-1-03206-002 • 0 1 I DeHaas &Associated, Inc. SHANNON&WILSON,INC. Attn: Mr. Marlin DeHaas January 31,2003 Page 5 deposits,but the abundance of organic staining seen in TP-1 and organic debris in TP-4 suggest • reworking by stream action. The groundwater levels fluctuate with the seasons of the year,being highest in late winter or , ' early spring and lowest during late summer or early fall. GEOTECHNICAL DESIGN RECOMMENDATIONS Earthwork • General Site Preparation , For areas to receive embankment fill, the subgrade preparation should include the stripping and removal of all surficial organic soil (sod, topsoil, duff), trees/roots, and unsuitable fill,if any, as 1 determined by a qualified representative of the Owner,i.e., the geotechnical engineer's representative. Stripping depth should be determined in the field,but for cost estimating and bidding purposes, assume 9 inches. After stripping,the areas should be graded reasonably level. Any pavement or slab on grade areas should then be proof-rolled with a half-loaded dump truck or similar vehicle in the presence'of a qualified representative of the'Client. Proof rolling should be deferred until just prior to the placement of embankment fills. Any soft or disturbed areas that are detected by the proof rolling should be removed and backfilled with engineered fill. The areas to receive fill should also be proof rolled, but with • compaction equipment to re-compact material disturbed'b.y the stripping operations. Any excessively soft areas should be removed at the discretion of the Owner'representative. The actual amount of soft or disturbed material to be excavated will probably need to be determined ' in the field, and we recommend that the specifications include a unit cost bid item for any over excavation. In lieu of removing soft areas during the summer months, the subgrade may be ' I ripped, aerated (if necessary), and compacted to structural fill standards, i.e., 95 percent of the standard Proctor maximum dry density(ASTM D 698). ' Excavation . For this project, excavations will be limited to cut areas and utility trenches. In our opinion, these excavations can be accomplished with conventional excavation equipment. Because of \\HAL\lshared\lproject\3200\3206.02 Wall St.35-100%\Rd&a01.doc 24-1-03.206-002 1 . 1 • DeHaas&Associated,Inc. SHANNON&WILSON,INC. Attn: Mr. Marlin DeHaas January 31, 2003 - Page 6 I safety considerations and the nature of temporary excavations,the Contractor should be made responsible for maintaining safe temporary cut slopes and supports for utility trenches, etc. We recommend that the Contractor incorporate all pertinent safety codes during construction. 0 Embankment Fill IEmbankment fill is for this project may consist of any soil, including the on-site soil that is free of organic or other deleterious matter, provided it is placed during dry warm weather and it is Umoisture conditioned, if necessary,(to raise or lower the water content)to achieve.optimal moisture content before it is placed for compaction. We assume that some of the fill may also a come from excess material resulting from grading of the new Library site and the Fanno Pointe development. Based on the natural water contents of these fine-grained soils, drying will be required. If grading work is accomplished during the wet time of the year, then a clean(not Omore than 5 percent passing the No. 200 sieve,based on a wet sieve analysis), granular, reasonably well graded soil is recommended and will need to be imported. The on-site soils, in our opinion, are not suitable for use as fill during wet weather. • I Embankment fills should be placed in thin lifts and compacted to a dry density of at least 95 percent of the standard Proctor maximum dry density(ASTM D 698). The thickness of the lifts will need to be determined in the field,but generally for self propelled compactors,the lifts should not exceed about 9 to 12 inches as measured in a loose condition. For small hand compactors,the lifts may need to be reduced to about 4 inches loose measure. ISlopes . • • IAll permanent cut and fill slopes-should be graded to 1 vertical on 2 horizontal or flatter. Flatter slopes may be necessary for ground cover and maintenance operations. I 1 Quality Control ' We recommend that an individual experienced in earthwork and construction methods monitors the site preparation and the placement and compaction of all structural fill. • • 1 \THAI\lsharedllproject13200\3206.02 Wall St.35-I00%\Rd&a0l.doc 24-1-03206-002 I 1 DeHaas & Associated,Inc. SHANNON&WILSON,INC Attn: Mr. Marlin DeHaas January 31, 2003 Page 7 I Settlement of Embankments I Settlement of the embankments will occur as the result of consolidation(compression) of the underlying soils. The maximum height of the embankment fill appears to be at the end of the , new Wall Street roadway east of about Sta. 14+00 where about 10 feet of fill will be placed. Elsewhere,the fill heights range between about 5 to 7 feet. ' Based on the consolidation tests made on samples of the subsurface soils (Figures 8 and 9), we estimate that settlement over most of the alignment will be less than an inch. However, east of . 1 about Sta. 14+00 where the height of the embankment is the greatest, the soils are the most compressible and in this area we estimate that the embankment settlement will be in the range of 4 to 5 inches. We estimate that most(80.percent) of the settlement will occur over a period of 3 . I. to 4 months, and we recommend that paving and concrete work be delayed as long as practical to allow as much of the settlement to occur as possible before paving. j Pavements ' Pavement Design Parameters A pavement section was developed for Wall Street using the methodology presented in the.1993 AASHTO Guide for Design of Pavement Structures. A pavement section, however, was not developed for the half street improvement of Hall Boulevard, where we recommend using the same section as the existing pavement. The pavement section design for Wall Street is based on.traffic information obtained from Y our traffic consultants, Kittleson & Associates,Inc. (KAI). They referenced the Traffic Impact • Study prepared by DKS which gives a year 2017 Average Daily Traffic (ADT)of 7,000 assuming that Wall Street continues through to Hunziker Street as originally planned. For this investigation,we have assumed that Wall Street will continue through to Hunziker Road at sometime in the future. j The 1993 AASHTO pavement design methodology is based on the number of equivalent 18-kip single axle loads (ESAL's) over the design life of the structure, which we have assumed as 20 years. The ADT for year 2017 was adjusted for the base.year 2003 by assuming a growth factor • of about 3%in reverse, and a growth factor of 3% reapplied to the base year over the 20-year \\k1AL\lshared\lproJect\320013206.02 Wall St.35.100%1Rd&a01.doc 24-1-03206-002 1 ' I DeHaas &Associated, Inc. SHANNON 6WILSON,INC. 1 .Attn: Mr. Marlin DeHaas January 31, 2003 Page8 I I design life. The percentage of vehicle types for Collector Roads used by the City of Salem was then used to determine ESAL's (see Appendix A). The input to the 1993 AASHTO pavement design methodology is listed below: , a . • Base Year 2003 ADT 5,000 vehicles • Design Life 20 years D • ESAL's 543,000 • Growth Factor 3% j D • Reliability 90% 1 • Overall Deviation 0.40 • Resilient Modulus 4,500 psi a. • Initial Serviceability 4.20 • Terminal Serviceability 2.50 • Asphalt.Drainage Coefficient 1.0 1 I • Aggregate Drainage Coefficient 0.8 1 • Asphalt Structural Coefficient 0.42 • Aggregate Structural Coefficient 0.14 Pavement Sections . IUsing the design parameters presented in the previous section, the P avement section should consist of either 4 inches of asphaltic concrete over 3 inches of aggregate leveling course over 15 ' inches of aggregate base course or 5 inches of asphaltic concrete over 3 inches of aggregate leveling course over 12 inches of aggregate base. These sections are greater than the City of 1 Tigard standard pavement section for a Collector Road,which consists of 4.inches of asphaltic concrete over 3 inches of aggregate leveling course over'12 inches of aggregate base course. I Since it is not certain that Wall Street will eventually continue to Hunziker Road,we recommend using the City of Tigard standard section. Even if Wall Street eventually continues through to Hunziker, the ESAL's will be less since our analysis assumes that Wall Street will connect with IHunziker starting from the base year 2003. . The design pavement sections assume that the top 12 inches of the subgrade will be compacted.. I to a dry density of at least 95 percent of the standard Proctor maximum d ry density (ASTM D I 698). r MAL\1sharechiproject\32oo13206.02 Wall St.35-lOO%\xa&a01.aoo 24-1-03206-002 I 1 Dellaas& Associated,Inc. SHANNON WILSON,INC. Attu: Mr. Marlin Del-Iaas January 31, 2003 Page 9 I Pavement Materials I Class B asphaltic concrete is recommended for the pavements. Asphaltic concrete should conform to the 1996 edition of the Oregon Department of Transportation Standard Specifications , for Highway Construction. The aggregate base material should consist of a clean, well-graded crushed rock or gravel g g conforming to the Oregon Department of Transportation Standard Specifications except that not more than 5 percent shall pass the No. 200 sieve (wet sieve). The base material should be graded from 1-1/2" -0 except for the top 2 inches,which should be a leveling course graded from 3/4" - 0. The CBR(California Bearing Ratio)value of the base material should not be less than 50, . • preferably greater, and have a sand equivalent not less than 30. The base material should be compacted to a dry.density of at least 98 percent of the standard Proctor maximum dry density (ASTM D 698). LIMITATIONS . The analysis, conclusions, and recommendations contained in this report are based upon site ' conditions as they presently exist, and further assume that the explorations are representative of I the subsurface conditions along the Wall Street alignment,that is, the subsurface conditions everywhere are not significantly different from those disclosed by the explorations. Within the limitations of the scope, schedule, and budget,the analyses, conclusions, and recommendations presented in this report were prepared in accordance with generally accepted professional geotechnical engineering principles and practice in this area at the time this report was prepared. We make no warranty, either express or implied. Our conclusions and recommendations are based on our understanding of the project as described in this report and the site conditions as interpreted from the explorations. I If during final design and construction, subsurface conditions different from those encountered in the filed explorations are observed or appear to be present, we should be advised at once so ' • that we can review these conditions and reconsider our recommendations where necessary. If there is substantial lapse of time between the submission of the final design report and the start , of work,at the site, or if conditions have changed because of natural forces or construction . 11 I \\HAL11sharedUproject\320013206.02 Wall St.35-100%1Rd&aOl.doo 24-1-03206-002 I DeHaas & Associated, Inc. SHANNON WILSON,INC. 1 Attn: Mr. Marlin DeHaas January 31, 2003 II II Page 10 operations at or adjacent to the site,we recommend that this report be reviewed to determine the I applicability of the conclusions and recommendations concerning the changed g g conditions o the time lapse. 111 This report was prepared for the exclusive use the design team. It should be made available to Dprospective contractors for information on the factual data only, and not as a warranty of ' subsurface conditions such as those interpreted from the explorations logs and presented in the , 0 discussions of the subsurface conditions included in this report. Unanticipated soil conditions are commonly encountered and cannot fully be determined by Umerely taking soil samples from borings. Such unexpected conditions frequently require that additional expenditures be made to attain properly constructed projects. Therefore, some Ocontingency fund is recommended to accommodate such potential extra costs. The scope of our geotechnical services did not include any environmental assessment or evaluation regarding the III I presence or absence of hazardous or toxic materials in the soil, surface water, groundwater, or air, on or below the site, or for evaluation of disposal of contaminated soils or groundwater, should any be encountered, except as noted in this report. ' Shannon& Wilson,Inc. has prepared a document, "Important Information About Your I Geotechnical Report,"to assist you and others in understanding the use and limitations of our report. This document is included at the end of this report in the appendix. ISincerely, SHANNON & WILSON,INC. �.�� -( IIZ,• 5382 .4e I �c1./. a.4 / 4 t._4, .. OREGON! K. Frank Fujitani,P.E. ✓G 6y Vice President l y ' �'��\ I F��Nl4 FU)c KFF/kff A: r);re s /0/6//0-:4 IIIEncl.: Figures 1 through 9 . Appendix A - Worksheet for Calculating 8 ki g - p Equivalent Axle Load Applications Appendix B -Important Information About Your Geotechnical/Environmental Report \\HAL\!shared\lprofect\320013206.02 Wall St.35-100%\Rd&aol.doc 24-1-03206-002 • DeHaas&Associated, Inc. SHANNON taWI ®N,INC. Attn: Mr. Marlin DeHaas January 31, 2003 Page 11 I REFERENCES CITED 1 AASHTO Guide for Design of Pavement Structures, American Association of State Highway Officials, 1993. Madin, I.P., 1990, Earthquake-Hazard Geology Maps of the Portland Metropolitan Area, - Oregon: Text and Map Explanation, Oregon Department of Geology and Mineral Industries I Open-File Report 0-90-2. i ii iI 1 . w i 1\HAL\lshared\lproject1320013206.02 Wall St.35-100%1Rd&andoc 24-1-03206-002 II Viz-7}Ilt � � p � ; i. :. 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L ii L I, 7 / ) . . „.„ , ......„ .._ ....„, 7 • .....-..:fi( ,,,...„ 1. • . . : • 1 . i /v ./ / / ,i,( • / , -- -it__ ......... _..„-........„.......:7 ,,,,,....... ._.: . , / -\ , i . , / , ,,z,." , ... ...„,- ,-:- ....-- . - „..-/- ...- . _I 1: Pa ewes.q of 'mod em . e s .. . la•bO P-0 SW WALL ST TP 22 / . —,TP-3 ' -. :L�,_ Ill• I 11.00 -+ - I2I00 \ ��'F _'_-_'--'- -�-�r _-��„,,J,__:� ,:�. y....... ,... , •I • • r and,e \N- -,/ - . - -,.. 7 -- . (M I I I I /' D__.-.-l.T?—_20 --1:1 O. __.9.. 'N.\ D N ` \\ 1 ZI �� / ./ �'� __�� \� �, \ \\.\ \ • a.i,, ,�, / ; / /// , ' � . � \ � � \ \ \ I . \ ./ / / Ii / / / • 0 40 . 60 • .Scale In Feet Wall Street LID • ' LEGEND Tigard,Oregon • TP•1 TEST PIT LOCATION AND NUMBER .PLAN OF EXPLORATIONS . . January 2003 24-1-03206-002 ' SHANNON&WILSON,INC. FIG.2• . e.ore.loal ei old n. Environments:Ooulre ts' MI a. - - as as - - as - r as all — a • — MIN 11111 •• ' Elev. Samples . - •L.Depth CLASSIFICATION OF MATERIAL i ; o Remarks•• 149.8 r—,--- z 1-. 3 -_ 0 1 i Sandy Organic to slightly Organic slightly Clayey SILT,soft to very - -- soft,dark brown to 1 foot,medium brown,moist,medium-low . • - • �. • I I I . plasticity,slow dilation,micaceous,fine-grained and trace {{ 38.2 - i I coarse grained sand,voids&/or blocky oxidized material In places, S-1 J -•• 1 I I 1 common fine roots and some tree roots to 1 Inch diameter,turf 6 to 10 — • 11 III inches:thlck. (Topsoil) B 1 - I i .I S-2 B 31.4 _ 1I2_ IiI - • III _ I I 1 2 - -_ III _ . t o — i l l — �l —3 146,8 I i i ^� --- 3- 3.0 : • , Stratified Sandy Organic to slightly Organlc.slightly•Claysy SILT to - • slightly Silty SAND,medium stiff/loose,mottled light brown;moist to • - . - 1 ---. : :. , wet,low plasticity to non-plastic,micaceous,fine-grained sand, -200=76% scaft 33,2 ered•organic particles. (Alluvium) S-3 B 4 4 = • - I - 5 : •• Mottled gray to brownish-gray with fine disseminated organic 5— t.." : • particles. . . . T-- I• S-4 J 49.2 - 1111 _ 6 6 -° • 1 7 _ 8 8 -• .• _- -200=46% _ S-5 J 45.6•9 ' ' .•' Increased sand content.. — 9 - . 36.9 '• -•- 10 139.8 • . . . 10 —• II T10.0 • Bottom of Excavation,Completed 1/13/03 . III = 11 11• . -• LEGEND . Wall Street LID Tigard, Oregon r .• E =3.0"O.D.Thin-Walled Sample a =Observed Ground Water Level .• .1i=Jar Sample A=Observed Seepage • [�]=sag Sample LOG OF TEST PIT TP-1 . page 1 of 1 No in' • L • • January 2003 24-1-03206-002 . Lines between soil/rock units are ch approximate and transition may be SHANNON&WILSON,INC. gradual. Oeotechnlcal end Environmental Consultants FlG. 3 • I Elev. v , •Samples I Stn CLASSIFICATION OF MATERIAL . • ,g o Remarks 149.5 I- 3 - 0 f Sandy Organic to slightly Organic slightly Clayey SILT,soft to very — soft,dark to medium brown,moist,low-medium plasticity,quick, — : I i I micaceous,fine-grained and trace coarse-grained sand,voids 84/or — —I ; � blocky oxidized material in places,some tree roots to 4 Inches S-1 32.0 — - 1 � ; l diameter,turf 6 to 8 inches thick. (Topsoil) 1 ^ — i i 'I - - 148.0 L•l.L — - 1.5 . : Stratified Sandy slightly Clayey SILT to Silty SAND,medium — - - :'•• stiff/loose,mottled light brown,moist,low plasticity to non-plastic, 31.0 -- ' 2 : micaceous,fine-grained sand. (Alluvium) B 2 = -200 69% —— S-3 _ S-2 33.7 - Dry density=87.8 pcf II -- 3 •. 3 - 22.0 _ Dry density 103.5 pcf . 4 • ' 24.2 4 - Dry density=95.2 pcf . . S-4 — 26.0 5 — - 5 _ Dry density=96.5 pcf - 6.. 6 — ; • ; Reddish oxidation mottling. • Mottled gray.. --•- - -200=41% _ • .F: • 5-5 J 30.1 - — 8 = . 8 : . . ' . —- 9 ; : Some brown organic staining and fine disseminated organics. �� 9 — •— 31.1 _— Slow seep.. r S-6 J - ' — 10 139.5 _ D 10.0 Bottom of Excavation,Completed 1113103 10 — T- 11 11 —• LEGEND Wall Street LID Tigard, Oregon 3,0"O.D.Thin-Walled Sample =Observed Ground Water Level I Eg-Jar Sample =Observed Seepage LOG OF TEST PIT TP-2 .®=Bag Sample paged of 1 i NOTE: January 2003 24-1-03206-002 3 Lines between soil/rock units are _ approximate and transition may be SHANNON &WILSON, INC. gradual. Oeotechnlcal and Environmental Consultants FIG• 4 • Elev. v Samples 1 Depth CLASSIFICATION OF MATERIAL 4. o Remarks 145.0 �� z° ' 3 0 1 —Sandy Organic to slightly Organic slightly Clayey SILT,soft to very soft,dark to medium brown,moist,low-medium plasticity,quick, — 1 I I micaceous,fine-grained sand,voids&/or blocky oxidized.material In _ ;— 1 i 1 places,common tree roots to 1 Inch diameter, turf 4 to 6 Inches thick, I I , contact dips to north, (Topsoil) — • 1 I I 1 - I1I — * 1 1 I ! Il ! I _ 2 ` 35.0 2 -- 1 1 1 S-1 142.5 1 1 .l — 2.5 Stratified Sandy slightly Clayey SILT to Silty SAND,medium N — 111 _ : •• stiff/loose,mottled light brown,wet to moist,low plasticity to — 3 • : non-plastic,micaceous,fine-grained sand,upper contact dips to 3— north. (Alluvium) . J i S-2 J' 27.4 ` -200 38.% 4 ' ' Common caving below 4 ft. 4 r 'O 5 ; ..: Reddish oxidation mottling, i 5 - • S-3 J 30,1 — — _ 6 — 6 t Gray. - a-- 7 • , --, 7 — S-4 J 26.9 - 8 g _ •' ' 136.0 _ S-5 J 33.8 p 9 9.0 Bottom of Excavation,Completed 1/13/03 9 - r - 1° 10 -- — 11 — I — 11 - I ' LEGEND Wall Street LID Tigard, Oregon ..=3.0"0.0,Thin-Walled Sample V =Observed Ground Water Level 1111-, al=Jar Sample Rr•=Observed Seepage LOG OF TEST PIT TP-3 +. [®=Bag Sample page e 1 of 1 II NOTE: Janus _ 24-1-0320.6-002 Lines between solVrock units are rY 2003 a doximate and transition may be SHANNON.&WILSON, INC. FIG. 6 r 0eoleohnlcal and Environmental Consultants I , Elev. c Samples ' Depth CLASSIFICATION OF MATERIAL a a, ;� a Remarks 2 I-- 3 L] _ _140:7 __ 0 ^ Sandy Organic to slightly Organic slightly Clayey SILT,soft to very soft,dark to medium brown, moist,medium-low plasticity,micaceous, I ,r_- I i I fine-grained sand,voids&/or blocky oxidized material In places,some -200=56% ( — 1 1 i' tree roots to:4 Inches diameter,turf 6 to 8 inches thick,some standing S-1 J 69:4 1 1 t water on surface. (Topsoil) 1 1' -- t i 1 . . — III •I i I 35.4 Dry density=81.8 pcf 1 138.7 1. 1 i .2. 2 C- 2 T 2.0 T Stratified Sandy Organic to slightly Organic slightly Clayey SILT to - • : Silty SAND,medium stiff/loose,medium brown,wet to moist,low S-2 =_ . •• ' plasticity to non-plastic,micaceous,fine-grained sand. (Alluvium) 37,5 . Dry density=84.5 pcf 1_. 3 3 —- 137.2 .. V 3.5 Gray,common carbonized woody material and reedy organics. nom, `4 y � 73.7 4 ' — d_ — Dry density=60.2 pcf III _ 6 . — S-3 - 5 135.7 — 5 . - 5.0 . Decreased organics. 77.7 I Dry density=56.3 pcf • • 1 —- 6 • . Common caving below 6 feet. 6 - 17 S4 J 34.9 I 7 ' • 7 = 4.0.8 -200=5% ' i 132.7 _ S-5 1 _- .8 8.0 Bottom of Excavation,Completed 1113/03 8 — = g 9 - r— t0 10 I --- 11 11 LEGEND Wall Street LID 1 Tigard, Oregon 1 =3.0"O.D,Thin-Walled Sample Q =Observed Ground Water Level • LT=Jar Sample NI =Observed Seepage ' ' LOG OF.TEST PIT TP-4 .. i 1 [8:1=Bag Sample page 1 of 1 INOTE: S Lines between soll/rock units are January.2003 . 24-1-03206-002 o approximate and transition may be SHANNON&WILSON, INC, FIG. 6 gradual. Geotechnloal and Environmental Consultants it 1 • i . . _. , • 11 . 140 •■■■• ■•111 TEST METHOD 'CC'CCC:�� D STANDARD METHOD A-4-inch Mold �■■C■■■►\ER © [x] 136.■■■ ■■■��■■� ASTM D 698) Material Passing No.4 Sleve KIR '■��� AASHTO T 99 C7 METHOD B-6-Inch Mold \,■O1 MODIFIED Material Passing No,4 Sleve 0 ■■■■ ■ IA ASTM D 1557 130 ■■■r■ ■ ■�■■� METHOD C-4-inch Mold • plin•••11111•••••1_ A ASHTO T 180 —� Material Passing 3/4-Inch Sieve • ••••••C••••11 O ■M���:��_ '�� C .METHOD D-6-Inch Mold Material.Passing 3/4-Inch Sleve 25 CC■■•■■CC.C:':M MUM 120 C ■■ : ■�: 11110k SAMPLE CLASSIFICATION • �C�■■i ■■' ,■ Brown low plasticity Sandy sl, clayey SILT NU■■■■■■ MEM , � . °- 11'6 ■■■■ ■� ■1\ ■► ■■■ C■■■■■C■■■.,.... CC• .. :CC=CC' `_I a C11Cs■■■■■■■■■ • I iii NOTES .,r 1 110 ■■■■■■■■ �■ ■I'M a _■��■ ■■•■■■�■■ ■��■■► Combination of TP1 S3 &TP2 S3 CS .1...9.r..r...C■© ■ .C ... : • 1 — - LEGEND illinift INIVE111111•111M11111111111111m11111111■_ L CBR=-3.0 at 96.8 % Comp. ;1 100 apiLliallanillbh p CBR= at /o Comp.1 ■■ ■■■■ ■■■■■E am, CBR= • at %Co I ■■u■� ■uw ■_ ■ ■ ■■r R.,, ■► • C■ ■ ■ iCa■■ ■■�■�eCC■ ■ ■ ■I\�►\I► . . .� .C:ECC:CC::■CS.E. . ■.► • 90 C■ .� ■ ..■ ■■ . C.■::'CC .a. 111111111111111111111111111■■C■ .■■■.I. 85 ■■■■■ ■ ■■'•�NNE�'■��NNE �S�Ck 100%'Saturation. ■ ■■■■E■ ■■ ■■■■ ■■ ■■ E. • or,.• . ©Sp.Gr.= ■ ■■■■■■ . ■ aUU IN EN ■ ■■■■C■a k\. ---- - 2.80 � .. . . s . _ .0 C .. . SIC. �U�C■C■CC■C ■E E■LE■C. =C C . . ■� ;,= 2.70 80 ■■■U� a■r"�ME■UU■■■■■� ■SJ=■CjC U IN:1 .1% 2.6Q ■■ ■ II ■ CC ■ ■■■�■■11 ■■■■■.■C°% ■ VIAMi•� ■■C ■■■■ ■� C■■■■C :C ■�............ ■ 75 ■�■�■■■■■E■■�■■■■■■ Em■■■■■■ ■■■ ■■■■■■�■UNO I 0 6 10 15. 20 25 30 • 35. 40 45 . WATER CONTENT-Percent Dry Weight • El TEST RESULTS • wail Street VD Maximum Dry Density 100.5 pcf Tigard,'Oregon , Optimum Water Content 22.5 COMPACTION TEST Natural Water Content 28.4 % D698 ' January 2003 24-1-03206-002 , • SHANNON&WLSON,INC. FIG. 'GeotechnIcal Consultants I .,Portland,Oregon 1 -- , I, - — . II 4- ----- • 8 -- , . . ' . 1 ..., , c ------ a. i z , a _ ___ — i < 0 . wr-- 18 . ____________ 20 22------: t— . — - -- , — EL.....„.......,_ " 28-- 30 _ 0.01 2 4 8 8 0,1 2 4 8 8 1 2 , 4 6810 2 4 6 6 100 • STRESS- tons per square foot . - I SAMPLE DATA Boring No TP-4 I • Sample No. 'S-3 Depth .. . . . 4.1 ft • Water Content . . 47.4 % " • -- Wet Density . . 102.8 pcf I Dry Density ...... 69.7 pcf Wall Street LID .. Tigard, Oregon Degree of Saturation % Initial Void Ratio . . . . i Classification: CONSOLIDATION TEST ' Brown Sandy SILT With Scattered Organics •12 January 2003 24-1-03206-.002 i • SHANNON&WILSON, INC. pia, 8 t.) Geolechnloal and EnvIronmehlal Consultants 0 ' I ' 0 — 1 , 1 —_ _ _ _ -- -- 4 1 6 — -- ____ 8 __ 1 12 — ---- - _ -_--- 0., 1 '1 _ 14' --- - 16 a F 18 —� rx I i II 20 - � _ 22 jas. 24 _ 0 �_26 - II28 — ---- —— 30 D 0.012 4 8 8 0,1 2 4 6 8 1 2 4 8 8 10 . 2 4 8 8100 i STRESS- tons per square foot - SAMPLE DATA Boring No. ..... ....... TP-4 Sample No. .S-3 Depth 5.2 ft Water Content .... 37.5 /0 ... . - Wet Density . . 116.9 pcf . • Dry Density 85.0 pcf Wall Street LID i . Degree of Saturation % Tigard, Oregon 6 Initial Void Ratio :.. ' Classification: CONSOLIDATION TEST Gray Silty Fine-grained SAND 1 January 2003 24-9-03206-002 SHANNON S WILSON,.INC. FIG. 9 s GeoteohnIcal and Environmental Consultants z ame am ow am ma No EN am am am am Ns or ems ow- a rWorksheet for Calculating 18-kip Equivalent Single Axle Load (ESAL)Applications Wall Street LID Job No.24-1-03206-002 .Current Traffic ADT=5,000 Vehicles per day, Vehicle percentage based on City of Salem Current Growth Design • ESAL - Design' . ITraffic Factors Traffic Factor ESAL. Vehicle Types (A) (B) • (C) (D) • (E) rPassenger Cars, 94% • 4,700 26.87 • 46,095,485 0.0008 36,876 Buses, 0.5% . . 25 26.87 245,189 0.6806 166,875 'r • Panel and Plcku Trucks, 2° p ruck , /0• 100 26.87 980,755 0.0122 11,965 Other 2-Axie/4-Tire Trucks • • 0 • 0.0052 0 2-Axle/6-Tire Trucks, 1.% • 50 26.87 490,378 0.1890 92,681 'r 3 or More Axle Trucks, 0.5% . 25 . • 26.87 245,189 0.1303 31,948 All single Unit Trucks 136,595 II • 3-Axle Tractor Semi-Trailers, 1% 50 . • 26.87 490,378• •. 0.8646 423,980 • I 4-Axle.Tractor Seml-Trailers, 1% 50 26.87 490,378 0.6560 321,688 5+Axle Tractor Semi-Trailers 0 2.3719 0 . . 1 . All Tractor Semi-Trailers . . • 745,668. . . 5-Axle Double Trailers 0 2.3187 0 6+Axle Double Trailers 0. 0 ' IAll Double Trailers 0 . 1 r 3-Axle Truck Trailers 0 . 0.1520 0 4-Axle Truck Trailers 0 0.1520 • 0 5+Axle Truck Trailers . . ' 0 0.5317 . 0 IlAll Truck Trailers .. 0 rAll Vehicles . -• Design ESAL 1,086,015 rCol.A x Col. B x.365 days/yr=Col C. Col. C.x Col.'D =Col. E ' . For Col. B, 2%Growth Factors for 20 yrs=24.30, and.for 25 yrs=32.03 I3%Growth Factors for 20 yrs=26.87, and for 25 yrs=36.46 - .. Values in Col D. from FHWA W-4 Weight Tables ESAL=Equivalent Single Axle Load • ' , r . Design Lane ESAL=Last.Number in COI. E x Directional Factor 0.5 x • • ' ( ) • Lane Distribution (0.9 or 1.0)= 543,007 ( ) I . i i an i i i i z 0. Ill i Worksheet for Calculating 18-kip Equivalent Single Axle Load (ESAL)Applications Wall Street LID Job No.24-1-03206-002 ICurrent Traffic ADT=5,000 Vehicles per day, Vehicle percentage based on City of Salem Current Growth Design ESAL Design O Traffic Factors Traffic Factor ESAL Vehicle Types (A) (B) (C) (D) (E) II .. Passenger Cars, 94% 4,700 26.87. • 46,095,485 0.0008 36,876 Buses, 0.5%. 25 26.87 245,189 0.6806 166,875 1 Panel and Pickup Trucks, 2% 100 26.87 980,755 0.0122 11,965 • ' Other 2-Axle/4-Tire Trucks 0 0.0052 0 2-Axle/6-Tire Trucks, 1% 50 26.87 490,378 0.1890 ,92,681 - 3 or More Axle Trucks, 0.5% 25 26.87 24.5,189 0.1303 31,948 All single Unit Trucks 136,595 I. I 3-Axle Tractor Semi-Trailers, 1% 50 26.87 490,378 . 0.8646 423,980 4-Axle.Tractor Semi-Trailers, 1% 50 .26.87 . 490,378 0.6560 . 321,688 I 5+Axle Tractor Semi-Trailers •0 2.3719 0 All Tractor Seml-Trailers 745,668 5-Axle Double Trailers 0 2.3187 0 6+Axle Double Trailers 0 0 i I All Double Trailers 0 In i Ill 3-Axle Truck Trailers 0 0.1520 0 4-Axle Truck Trailers 0 0.1520 0 5+Axle Truck Trailers 0 0.5317 0 !' All Truck Trailers 0 • All Vehicles - Design • ' ESAL ,1,086,015 1 Col.A_x Col. B x.365.days/yr=Col C. Col. C x Col. D =Col. E i For Col. B, 2% Growth Factors for 20 yrs= 24.30, and for 25 yrs= 32.03 . :'I 3%Growth Factors for 20 yrs=26.87, and for 25 yrs =36.46 Values In Col D. from FHWA W-4 Weight Tables . ESAL =Equivalent Single Axle Load Design Lane ESAL=Last Number in Col. E x Directional Factor(0.5)x ( ) Lane Distribution (0.9 or 1.0)= 543,0.07 I . MI am ow NE ow ow ows NW —on- EN me No Mit MN EN ow we NIP NI- SHANNON &WILSON, INC. Attachment to and part of Report 24-1-03206-002 IIIIIIII Geotechnical and Environmental Consultants Wall Street LID Date: January 31,2003 _ To: DeHaas&Associates,Inc. Important Information About Your Geotechnical/Environmental Report IL CONSULTING SERVICES ARE PERFORMED FOR SPECIFIC PURPOSES AND FOR SPECIFIC CLIENTS. 'I Consultants prepare reports to meet the specific needs of specific individuals. A report prepared for a civil engineer may not be adequate for a construction contractor or even another civil engineer, Unless indicated otherwise,your consultant prepared your report expressly - Ifor you and expressly for the purposes you indicated. No one other than you should apply this report for its intended purpose without first conferring with the consultant. No party should apply this report for any purpose other than that originally contemplated without first conferring with the consultant; THE CONSULTANT'S REPORT IS BASED ON PROJECT-SPECIFIC FACTORS. A geotecluiicalJenvironmental report is based on a subsurface exploration plan designed to consider a unique set of project-specific factors. Depending on the project,these may include: the general nature of the structure and property involved;its size and configuration;its historical use and practice;.the location of the structure on the site and its orientation;other improvements such as access roads,parking i lots,and underground utilities;and the additional risk created by scope-of-service limitations imposed by the client. To help avoid costly ?. problems,ask the consultant to evaluate how any factors that change subsequent to the date of the report may affect the recommendations. Unless your.consultant indicates otherwise,your report should not be used:(1)when the nature of the proposed project is changed(for • i example, if an office building will be erected instead of a parking garage, or if a refrigerated warehouse will be built instead of an IIIunrefrigerated one,or chemicals:are discovered on or near the site);(2)when the size,elevation,or configuration of the proposed project +11 ltered;(3)when the location or orientation of the proposed project is modified;(4)when there is a change of ownership;or(5)for .application to an adjacent site. Consultants cannot accept responsibility for problems that may occur if they are not consulted after factors Y Y factors, which were considered in the development of the report,have changed. 'SUBSURFACE CONDITIONS CAN CHANGE. Subsurface conditions may affected as a result of natural processes or human activity. Because a geotechnical/environmental report is based on conditions that existed at the time of subsurface exploration,construction decisions should not be based on a report whose adequacy may have been affected by time. Ask the consultant to advise if additional tests are desirable before construction starts; for example,groundwater conditions commonly vary seasonally. ''Construction operations.at or adjacent to the site and natural events such as floods,earthquakes,or groundwater fluctuations may also affect subsurface conditions and,thus,the continuing adequacy of a geotechnical/environmental report. The consultant should be kept , apprised of any such events,and should be consulted to determine if additional tests are necessary. - MOST RECOMMENDATIONS ARE PROFESSIONAL JUDGMENTS. 1 It exploration and testing identifies actual surface and subsurface conditions only at those points where samples are taken. The data were extrapolated by your consultant,who then applied judgment to render an opinion about overall subsurface conditions. The actual interface between materials may be far more gradual or abrupt than your report indicates. Actual conditions in areas not sampled May ! differ from those predicted in your report. While nothing can be done to prevent such situations,you and your consultant can work _ ; 'together to help reduce their.impacts. Retaining your consultant to observe subsurface construction operations can be particularly beneficial in this respect. ' ii II A.REPORT'S CONCLUSIONS ARE PRELIMINARY. ( :) . . The conclusions contained in your consultant's report are preliminary because they must be based on the assumption that conditions evealed through selective exploratory sampling are indicative of actual conditions throughout a site. Actual subsurface conditions can be discerned only during earthwork;therefore,you should retain your consultant to observe actual conditions and to provide conclusions. i1 i 1 II Page 2 of 2 Only the consultant who prepared the report is fully familiar with the background information needed to determine whether or not the ..report's recommendations based on those conclusions are valid and whether or not the contractor is abiding by applicable ( , )commendations. The consultant who developed your report cannot assume responsibility or liability for the adequacy of the report's ! recommendations if another party is retained to observe construction. I THE CONSULTANT'S REPORT IS SUBJECT TO MISINTERPRETATION. • Costly problems can occur when other design professionals develop their plans based on misinterpretation of a geotechnical/environmental I report To help avoid theseproblems,the consultant should be retained to work with Other project design professionals to explain relevant geotechnical,geological,hydrogeological,and environmental findings,and to review the adequacy of their plans and specifications relative to these issues. BORING LOGS AND/OR MONITORING WELL DATA SHOULD NOT BE SEPARATED FROM THE REPORT. .. I Final boring logs developed by the consultant are based upon interpretation of field logs(assembled by site personnel),field test results; and laboratory and/or office evaluation of field samples and data. Only final boring logs and data are customarily included in geotechnioal/environrnental reports. These final logs should not,under any circumstances,be redrawn for inclusion in architectural or' other design drawings,because drafters may commit errors or omissions in the transfer process. ' To reduce the likelihood of boring log or monitoring well misinterpretation,contractors should be given ready access to the complete geotechnical engineering/environmental report prepared or authorized for their use. If access is provided only to the report prepared for you,you should advise contractors of the report's limitations,assuming that a contractor was not one of the specific persons for whom 1 1 the report was prepared,and that developing construction cost estimates was not one of the specific purposes for which it was.prepared. ! While a contractor may gain important knowledge from a report prepared for another party,the contractor should discuss the report with" your consultant and.perform the additional or alternative work believed necessary to.obtain the data specifically appropriate for ' construction cost estimating purposes. Some clients hold the mistaken impression that simply disclaiming responsibility for the accuracy of subsurface information always insulates them from attendant liability. Providing the best available information to contractors helps :te vent costly construction problems and the adversarial attitudes that aggravate them to a disproportionate scale, ' READ RESPONSIBILITY CLAUSES CLOSELY. . IBecause.geotechnical/environmental engineering is based extensively on judgment and opinion,it is far less exact than other design disciplines.This situation has resulted in wholly unwarranted claims being lodged against consultants, To help prevent this problem, consultants have developed a number delouses.for use in their contracts,reports and other documents. These responsibility clauses are not exculpatory clauses designed to transfer the consultant'liabilities to other parties;rather,they are definitive clauses that identify where .' the consultant's responsibilities begin and end. Their use helps all parties involved recognize their individual responsibilities and take appropriate action. Some of these defmitive,clauses are likely to appear in your report,and you are encouraged to read them closely. Your. consultant will be pleased to give full and frank answers to your questions. I The preceding.paragraphs are based on information provided by the - ASFE/Association of Engineering Firms Practicing in the Geosciences,Silver Spring,Maryland _..) , t I - 1/2000 I . Ac. t,e H .116 cs� 3 I ) I Stormwater. Report Tigard Public Library I Prepared For City of Tigard 13125 SW Hall Blvd. Tigard, OR 97223 f I • 0.4 PR0i- •4 11,670 '4 ORE �� JUG y!6.1882 c. AIMS 0 eAp 121‘1103 5/27/03 Kurahashi and Associates 15580 SW Jay St. Suite 200 Beaverton, OR 97006 .i• City of Tigard Library i Stormwater Report 5/27/03 Introduction The City of Tigard intends to construct a library on an undeveloped site adjacent to Hall Boulevard. The 4.99-acre site (developed portion) lies between Hall Boulevard and Fanno Creek, Historically site contained a house with an open field/orchard behind the building. The new addition involves adding 1.91 acres of buildings,parking, landscaping and other uses. The site drains to Fanno Creek and eventually the Tualatin River. Appendix C contains a site - map of the proposed facilities. Table 1 summarizes the hydrology y gy and hydraulic calculations for the site. The following information provides.a preliminary description of the stormwater system. i Contributing Areas The portion of the site under development contains 4.99 acres of which 1.91 acres will convert to impervious surfaces.The entire parcel consists of 3 separate tax lots(T2S R1W Section 2 Lots 100, 200, 600)totaling 14.7 acres. Table 2 shows the individual existing and proposed impervious surface by tax lot I While the site contains a major draw,Hall Boulevard intercepts any off.-site runoff. Appendix C contains a drainage map for the site. I • Site Hydrology Stormwater flows were calculated using the Santa Barbara Unit Hydrograph(SBUH) methodology to determine the site hydrology for both the existing(Pre developed)and post ost I developed conditions, The Washington County Soil Survey identifies the site soils as Quatama with a classification C(note some Verboort Clays are located in stream corridor). Using this soil type,pervious area CN was established at 86 and the impervious areas received a CN of 98. Appendix A contains the soil information for the site. • Table 1 summarizes the SBUH assumptions. Existing Site Flows Based upon a composite CN of 86, existing site runoff flows were calculated for the 2, 5, 10, 25, and 100-year stormwater events. The time of concentration was estimated using the lag method, and a Type 1A-rainfall distribution applied with Clean Water Services(CWS)standard rainfall amounts. Appendix B contains the data and SBUH printouts for the predeveloped conditions. Table 1 summarizes the predevelopment site flows. (Note: Hydroflow by Intellisolve was the software package used to determine flows and make detention calculations.) 1 Tigard Public Library Stormwater Report 1 1 Proposed Site Flows Based upon a composite CN of 91 and a minimum time of concentration of 5 minutes, postdevelopment runoff flows were calculated for the 2,5, 10, 25, and 100-year stormwater events. Table 1 summarizes the postdevelopment site flows. Appendix B contains the SBUI-I printouts for the postdeyeloped conditions. (Note: I-iydroflow by Intellisolve was the software package used to determine flows and make detention calculations.) IDetention System . The site discharges to Fanno Creek, which lacks downstream flow capacity restrictions. In the Oabsence of downstream impacts,detention was not included in the project. Water Quality Treatment . In order to meet Clean Water Services' water quality requirements,the project includes a water D quality swale with a pollution control manhole. Based upon the 0.36-inch water quality storm and the design criteria in the CWS Manual,a 30-foot wide by 100-foot long swale was included in the southeast corner of the site. (Note the actual bottom width of the swale was 2 feet) Appendix D contains the swale hydraulic calculations for the water quality. facilities. If the extension of Wall Street occurs,the city may elect to use the library swale to treat the street impervious area. The library.swale was evaluated adding the street impervious area. This evaluation concluded the swale can accommodate the additional street impervious surface. Appendix D contains the water quality calculations including both the library and the street. Conveyance The majority of the site conveyance consists o J Y y of a conventional piped system with manholes,rain drains, cleanouts,catch basins,and other related appurtenances. In the parking lot and building Ientrance areas, several proposed landscaping swales connect to the conveyance system. . Design of the final site conveyance facilities was in accordance with the City of Tigard Plumbing Code. IAppendix E contains the conveyance calculations for the project. Public System Impacts The proposed facilities avoid impacts to the public system with direct discharge to Fanno Creek. The city's transportation master plan indicates a major'arterial along the south site boundary. Site drainage facilities anticipate construction of that roadway. . ' I . I 1 Tigard Public Library • Stormwater Report 2 Table I Tigard Public Library • • ' Summary of Storm Drainage Criteria 1116103 • Pre Development Data Post Development data .. Soil Type Quatama Group C Quatama Group C Total Area(ac) 14.7 • 14.7 .. Developed Area (ac) 4.93 4.99 Impervious Area(ac) 0.03 _ 1.91 Pervious.area(ac). 4.99 3.08 CN-pervious 86 86 CN-Impervious 98 98 CN-Composite. 88 91 Tc(min) 11 5 Water Quality Volume(ft3) . na 2496 • Water Quality Flow(cfs) . - na 02 Predevelopment Post development Detention Flows(cfs)- Flows(cfs) Release(cfs) Rainfall(inches) 2 year _ 1.3 2.02 na 2.5 5 year 1.93 2.75 na 3.1 10 Year 2.31 _ - . .'3.18 na 3.45 - 25 Year 2.82 _ 3.74 na . 3.9 50 year na .. na na . 42 100 year . 3.5 449 , na 4.5 Note Verboort soils also present on site Volume 2496 Dry Pond Depth. 2.0 Length/width ratio 6 Width - 14.4 Assumes no side slope Length 86.5 - Tigard Public Library Stormwater Report , • OM 1.10 MI 111111 NM s MI NIB 1111111 11111111 Mil IIIIII INN IIIIIII MI I= MN - ITable 2 Tigard Public Library Impervious Area by,Tax Lot. . 5127103 I Tax Lot Total Area Existing Impervious Proposed Impervious ' (acres) Area (acres) Area (acres) 100 3.33 0 0.53 200 3.30 0 1.07 600 8.07 0.1 0.37 Total 14.7 0.1 . 1.97 • Note • Total area reflects tax lot area, not the entire developed portion of site I .'.. • 1 t 1 1 iTigard Public Library Stormwoter Report 4 1 Appendix A Soils Data • . • I , . . • • . 11 11 • . • • • • . 1 • • •• - • • III I ~ . SOIL SURVEY . 118 I • TABLE.12.Physical and chemical Available ', Soil name and "• • Soil map symbol Depth Permeability city . reaction •1% Inihr InJin pTl • Me1by: 32C, 32D, 32E, 33E, 33F.336 _._ 0-9. 0.6-2.0 '• 0.19-0.21 4,5-5.5 9--25 0.6-2.0 • 0.19-0.21• 4.5-54 , 6 . 25-446. 02-0.6 • 0.13-0.17 4.5-5.6 i Olyic: • 34C,340,34E, 35E,36F,3SG �._- 0-12 . 0.6-2,0 • 0, 8-0.21 • • 5, ,0 I '; 12•-•ail 0 0.17.-0.21 4. ;0 41 Pervina: 111 I 36C, 36D,365,36F 0-4 0.2-0,6 0.18-0.20 5.6-6.0 • 4-29 0.2-0.6 • 0.18-0,20 5.6-6.0 29-60 . 0.2-0.6 0.18-0.16 5.1-6.0 (clD2 _tam • A, 3 8, 37C, 3 ----- __ 0-15 0,6-2,0 0.19-0:28 6,6-6.0 • �∎____,____ 15-80 , 1 5.6-6.0 80-62 0.2-0.6 0.10-0.12 6.6-6.0 Iii Saurri: 388, 38C, 380, 38E, 38F 0-8 0.6-2.0 • • 0.19-0.21 5.6-6,0 8-23 0.6-2.0 0.18-0.20 5.6-=6.0 28-660 0.2-0.6 0.12-0.16 6.6-6.0 'Tolko: , 39E, 39F .._ 0-10: 0,6-2.0 0.17-0.21 5.1-5.5 ' 10--61 0.6-2.0 0.19-0.21 4.6-5.0 , Udifluvents: • 40 .-------__.___._._ 0-60 Verboort: • • 42 0-19 0.2-0.6 ' ' 0:19-0:21 5.6-0-0 19-38' 40.06. . 0.08-0-05 6.0-0:5 88-60 0.06-0.2 0.19-0.21 6.6-7.3 Wapato: • 43 .1-----_----......---,-_ 0-14 0.2-2.0 0.19-0.21 5.6-6.5 I 14-60 .9.2-0,6 • 0.19-0.21 5.6-0-5 Willamette: 44A,448,44C,44D 0-28 0.6-2.0 0.19-0.21 5.6-6.5 I - '28-43 0.6-2.0 • 0,19-0.21 54-6.6 48-60 0.6-2,0 0.19-00.21 5.6-6.5 • Woodburn: 45A, 458, 45C, 45D _ 0--16 0.6-2.0 • 0.19-0.21 • 5:6-6.5 ' ' 16-31 0,6-2.0 0.19-0. 1 5.G-6.5 I 81-60 •0.06-0.2 • 0.19-0.21 • 5.6-6,5 Xerochrepts: '46F: • - Xorochrepts part • 0-60 . 0.2-2.0 0.16-0.21 5.1-6.0 Raploxerolls part _r.____.-------- 0-12 0.2-2.0 0.19-0.21 5,14.0 12-60 0.2-2,0 0.19-0.21 - • • 5.1-6.0 1470: - • Xerochrepts part 0-15 16 • Rock outcrop part. 'This mapping nit•is made up of two or more dominant kinds of soil. See mapping unit description for the composition and behavior of�,;th pol mapping unit. 9 . '' 7•fi 3i' _ .„ . , .- , - - -. .:, . ;,• --_ ---.. , _ --,_- -,- _,•,__ -.-.'-,:.., .,,-.'--. -_,. .,- ,:-.-,_ '-.:..: - •-- -,-.,.._.--:„.:-....-::-..ZE_.-. ..1.1,,iv.-,-, i . . . , 122 SUM SURVEY TABLE 18.-•Soil and II ------._ II Flooding Hydro- Soil name and logic • :i. map symbol group Frequency Duration Months i • _______________ i., Klickitat: I 25E, 25F, 25G Knappa: B None . - I26 --:.----------------------- B None ---- 1 Labish: 27 D Frequent Very long Dec-Apr-__---------- 1 Laurelwood r 288, 28C, 28D,28E, 29E, 29F B None • I , McBee: 30 13 Frequent Brief Nov-May Melbourne: II 318, 3IC, 3ID, 31E, 31F ---------- B None --- - - Melby: 0 . . 32C,32D,32E,33E, 33F,33G C None --- • .1 Olyic: • III. 34C, 34D,34E,35E, 35F,35G B None . Pervina: i 36C, 36D, 36E,36F C None I • Quatama: • 37A, 3713, 37C, .370 (...0 None 111 • 11; Saum: • • 388, 38C, 38D, 38E, 38F Tolke: 1; 39E,, 39F C None B None • • II Udifluvents: 40' B' Frequent Very brief Nov-Apr 111 Verboort: • . • 42 0 Frequent Brief Dec-Apr 111 W,I4trato: D Frequent Brief Dec-Apr 1 ; Willamette: 1 44A, 44B, 44C, 44D __: B None Woodburn: 45A, 45B, 45C, 45D C None I Xlrottrepts: . . Xerothrepts part B None Haploxerolls part ____________-- C None . III 347D: - Xerochrepts part D ' None • . Rock outcrop part. ;ntippingt pit is made ITitof two or more dominant kinds of soil. See mapping unit description for the composition and I beh:iChis , •11 ' • I . . . KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUA!" • TABLE 3.5.28 SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS SC$WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS In 1982) — .I, • ,, Runoff curve numbers for selected agricultural,suburban and urban land use for Type to rainfall distribution, 24-hour storm duration.• • CURVE NUMBERS BY HYDROLOGIC SOIL GROUP LAND USE DESCRIPTION A B C • D • Cultivated land(1): winter condition 86 91 94 95 • Mountain open areas: low growing brush and grasslands 74 82 89 92 1 Meadow or 65 78•• 85 89 �._._ i pasture: Wood or forest land: undisturbed'or older second growth 42 64 76 :&t Wood or forest land: young second growth or brush 55 .22 81 86 11 i Orchard: with cover crop 81 88 92 94 _ L Open spaces, lawns,parks, golf courses, cemeteries, good condition: grass cover on 75% • Pr more of the area 68 80 (9 90 fair condition: ' grass cover On 50% to 75% of the area • 77 85 90, 92 Gravel roads and parking lots 76 85 89 91 • Dirt roads and parking lots 72 82 87 89 impervious surfaces, pavement, roofs, etc. 98 98 98 98 ,, Open water bodies: lakes, wetlands, ponds; etc. 100 100 100 100 • • Single Family Residential (2) I • Dwelling Unit/Gross Acre • % impervious(3) . 1.0 DU/GA . 15 Separate curve number 1.5 DU/GA. . 20 shall be selected 2 0 DO/GA 25 tor.pervious and 2:5 .DU/GA 30 , impervious-portion • ` 3.0 DU/GA of the site or basin . . 3.5 DU/GA 38' 4.0 DU/GA • 42 . .• 4.5 DU/GA 46 5.0.DU/GA 48 • 5.5 DU/GA 50 - 6.0 DU/GA - 52 6.5 DU/GA 54 . • . 7.0 DU/GA 56' - Planned unit developments, % impervious I condominiums, apartments, must be'computed • commercial business and • . industrial areas. (1) For a more detailed description oragricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrology, Chapter 9, August 1972. . • (2) Assumes roof and driveway runoff is directed into street/storm system. ' (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. fil - l te 4 . 3.5.2-3 . 11/92 , • 1 t Appendix B Predeveloped Flow Calculations I • Post Developed Flow Calculations • • • • • • i 1 1_ 1 1 . 111 I . . . . I 1 Hydrograph Return Period Recap Page 1 , tiyd. . Hydrograph Inflow Peak Outflow(cfs) Hydrograph No. type Hyd(s) — - description (origin) 1-Yr 2-Yr 3-Yr 5-Yr 10-Yr 26-Yr 60-Yr 100-Yr 1 SBUH.Runof ---- -- 1.30 ------ 1.93 2.31 2.82 --- 3.50 Library Site Predevelopment I 2 SBUH Runof ----- --- 2.02 ----- 2.75 3.18 3.74 ------ 4.49 Library Site Post Development 1 I • I i I I • . • • • • I 1 I 1 Proj, file: Library hydrology.gpw Run date: 01-13-2003 1 i-lydraflow Hydrographs by Intetisolve I • • IHydrograph Summary Report Page1 1yd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph No. type flow interval peak hs) elevation storage description Pt (origin) (cfs) (min) (min) (cuff) yd( (ft) (cuff) I1 SBUH Runof` 1.30 6 480 22,390 — — ----- Library Site Predevelopment 2 SBUH Runof 2.02 6 480 29,105 — ----- ------ Library Site Post Development . i • 7. 1 :: s'' . . L.±.lbrary hydrology.gpw Return Period: 2 yr Run date: 01-13-2003. Intelisolve Hydraflow Flydrograph$by Hydrograph Summary Report Pagel • Hyd. Hydrograph Peak Time Timo to Volume Inflow Maximum Maximum Hydrograph No. type flow interdai peak hyd(s) elevation storage description (origin) (cfs) (min) (min) (cult) • - (ft) (cult) 1 SBUH Runof 1.93 6 480 31,496 -- --- ----- • Library Site Predevelopment I 2 SBUH Runof 2.75 6 480 39,125 ---- — Library Site Post Development • • • 1 - i • • • 1 • • 1 I I � • I • • • • I Proj...file: Library hydrology.gpw Return Period: 5 yr Run date: 01-13-2003 Hydraflow Hydrographs by inteiisoive I . Hydrograph Summary Report Page, gi 11yd. Hydrograph Peak Time Time to Volume inflow Maximum Maximum Hydrograph I No. type flow interval peak hyd(s) elevation storage description (origin) (cfs) (min) (min) (tuft) (ft) (tuft) I1 SBUH.Runot` 2.31 6 480 37,008 ---- ------ ---- Library Site Predevelopment 2 SBUH Runof 3.18 6 480 45,079 -- --- Library Site Post Development I .. . • I- - I • 1 1' • • Proj. file:.Library hydrology.gpw Return Period: 10 yr Run date: 01-13-2003 Hvdratlow Hvdrooraphs by lntelisolve 1 Hydrograph Summary Report Page, r Hyd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph No. type flow interval peak hyd(s) elevation storage description (origin) (cfs) . (min) (min) (cult) (ft) (cult) 1 SBUH Runor 2.82 6 480 44,255 --- -.---- —. Library Site Predevelopment I 2 SBUH Runof 3,74 6 480 52,816 ---- ---- Library Site Post Development • • I 1 I + 1 r � I t Proj. file: Library hydrology.gpw Return Period:25 yr Run date: 01-13-2003 Hvdraflow Hvdreeranbs by Intelisolve • I I Ilydrog.raph Summary Report Page1 I,. Hyd. Hydrograph Peak Time Time to Volume inflow Maximum Maximum Hydrograpl► No. type flow interval peak hyd(s) elevation storage description (origin) (cfs) (min) , •(min) (cult) " • _ (ft) (cuff) I 2 • SBUH Runoff 3.50 6 480 54,128 — -- Library Site Predevelopment SBUH Runoff 4.49 6 474 63,239 . Library Site Post Development I . : . . , I_., I '- . • Proj. file: Library hydroiogy.gpw Return Period: 100 yr Run date: 01-13-2003 1-I\a4fafIMU W*, n.nranhS by inteliSOlve I Hydrograph Report 1 Page Hydraflow Hydrographs by Intelisolve Hyd. No. 91 Library Site Predeveloprrient Hydrograph type = SBUH Runoff Peak discharge = 2.82 cfs I Storm frequency = 25 yrs Time interval = 6 min . Drainage area = 4.99 ac Curve number = 86 Basin Slope = 2.0 % Hydraulic length = 550 ft. T I c method = LAG Time of conc. (Tc) = 11.4 min Total.precip, = 3.90 in Distribution = Type IA Storm duration = 24 hrs Shape factor = N/A ' Hydrograph Volume=44,265 tuft Hydrograph'Discharge Table • I • Time --.Outflow. Time »- Outflow Time --Outflow Time - Outflow ' S (hrs . cfs) (hrs cfs) (hrs _ cfs) (hrs cfs) • 3.60 0.03 . 7.00 0:61 10.40 0.77 13.80 0:57 3.70 0.04 7.10 0.65 10.50 0.75 . 13.90 0.57 I • 3.80 0.05 7.20 0.70 1.0.60 0.75 14.00 0:56 3.90 0.06 .7.30 0.76 10.70 0.75 14.10 0.56 4,00 0.07 7.4.0 0.84 10.80 0.74 14,20 . 0.56 ° • 4.10 0.09 7:50 0.93 10.90 0.73 14.30 0.56 4.20 0.10 • -7.60 1.29 1 1.00 0.72 14.40 0.56 4.30 0.11 7.70' 1.86 . 11.10 0.71 14.50 0.56 ' • 4.40 0.12 7.80 2.31. , 11.20 0.70 . ' 14.60 0.56 r 4.50 0.13 7.90' 2.63. 11.30 0.69 14.70 0.56 4.60 0.14 8,00 '2.82<< 11.40 0.68 14.80 0.55 4.70 0.16 .8.10 2.69 11.50 0.67 14.90 0:55 . I 4.80 . 0.17 8.20 2.34 11.60 0.66 16.00 0.55 4.90 0.19 8.30 2,04 . 11.70. 0.64 15.10 0.65 5.00 0:20 8.40 1.78 11.80 0.63 15.20 0.55. 5.10 0.22 8.50 1.57 11.90 0.62 15.30 0.54 . 5.20. 0.24 8.60 1.45 12.00 0.61 • 15.40 0.54 6.30 0.26 8.70 1.38 12.10 0.61 15.50 0.54 5.40 0.27 8.80 -• 1.31 12.20 0.61 15.60 - 0.54 I 5.50 0.29 8.90 1.24 12.30 0.61 15.70 0,54 5.60 0.31 9.00 1.17 12.40 0.61 • 15.80 0.53 5.70 0.32 9.10 1.10 12.50 .0.62 15.90 0.63 5,80 0.34 9.20 1.04 . 12.60 0.62 16.00 . 0.53 5.90 0.36 9.30 0.99 12.70 0.61 16.10 0.53 6.00 . 0.38 9.40 0.94 12.80 0.60 16.20 0.53 1 6.10 0.41 9.50 0.91 12.90 0.60 16.30 . 0.52 6.20 .0.44 9:60 0.87 13.00 0.59 16.40 0.62 6.30 0.48 9.70 0.86 13.10 0,59 16.50 0.52 6.40 0.50 9.80 0.86 13.20 0.60 16.60 0.52 6.50 0.53 9.90 0.84 13.30 0.60 16.70 0.52 6.60 0.54 10.00 0.82 13.40 0.59 16.80 0.51 r 6.70 0.55 10.10 0.82 • 13.50 0.59 . ' 16.90 0.51 , 6.80 0.56 10.20 . 0.81 13.60 0.58 17.00 0.51 6.90 0.58 1 0.30 0,78, 13.70 0.58 17.10 0.51 I Continues on next page... 11 I • Library Site Predevelopment Page 2 Hydrograph Discharge Table ITime --Outflow Time --Outflow (hrs cfs) (his cfs) I17.20 0.50 22.30 0.38 17.30 0,50 22.40 0.38 II 17.40 0.50 22.50 0.38 17.50 0.50 - 22.60 0.37 , 17.60 0.50 22.70 0.37 17.70 0.49 22.80 0.37 I 17.80 0.49 22:90 0.37 17.90 0.49 23.00 0.36 18.00 0.49 23.10 0.36 • I 18.10. 0.48 23.20 0.36 18.20 . 0.48 23.30 0.36 18.30 0.48 23.40 0.35 1.8.40 0,48 23:50 0.35 118.50 0.47 23.60 0.35 18.60, 0.47 23.70 0.35 18,70 0.47 .23:80 0.34 . 18.80 0.47 23.90 0.34 18.90 0.47 24.00 . 0.34 19.00 0.46 19.10 0.46 19.20 0.46 ...End 19.30 0.46 ' 19.40 0A5 • 1.9.50 0.45 . . I 19.60 0.45 . 19.70 0.45 . 19.80 0.44 1.9.90 0.44 , 20.00 0.44 . 20,10 0.44 20.20 0.43 . 20.30 0.43 20.40 0.4.3 20.50 0.43 ., i 20.60 0.42 _ I 20.70 0.42 . 20.80 0.42 20.90 0.42 I 21.00 0.41 21.10 0.41 21.20 0:41 21.30 0.41 I 21.40 0.40 . 21.50 0.40 21.60 • 0.40 21.70 0.40 I 21.80 0.39 - 2t90 0.39 22.00 0.39 ' 1 • 22.10 0.39 . 22.20 0.38 I I Hydrograph Report Page 1 I Hydraflow Hydrographs by Intelisolve Hyd. No. 2 Library Site Post Development ■ Hydrograph type = SBUH Runoff Peak discharge = 3.74 cfs I Storm frequency = 25 yrs Time interval = 6 min Drainage area = 4.99 ac • Curve number = 91 Basin Slope = 0.0 % Hydraulic length = 0 ft I Tc method = USER Tirhe of conc. (Tc) = 5 min Total precip. = 3,90 in Distribution = Type IA Storm duration . = 24 firs Shape factor = N/A . • Hydrograph Volume=52,816 cult Hydrograph Discharge.Table . . Time -Outflow Time --Outflow Time--Outflow Time --Outflow (hrs '. cfs) (hrs cfs) (hrs cfs) (hrs • cfs) , 2.50 0.05 5.90 0.60 .9:30 1.07 12.70 0.66 2.60 0.07 6.00 0.63 9.40 1.02 12.80 0.65 2.70 0.08 6,10 0.68 9.50 0.99 12.90 . 0.65 2.80 0.09 6.20 0.72 9.60 0,96 . 13.00 0.65 2.90 0.10 6.30 0.76 9.70 0.95 13.10 0:66 3.00 0.11 6.40 0.79 9.80 0.95 13.20 0:66. 3.10 0:13 • . 6.50. 0.81 9.90 0.94 13.30 0.66 3.20 0.14 • , 6.60 0.80 10.00 0.92 13.40 0:65 3.30 0.15 6.70 0.79 10.10 0.92... 13.50 0:64 II 3.40 0.16 6.80 0.80 1020 , 0.90 13.60, 0.63' • 3.50' 0.17 6.90. 0.84 10.30. 0.86 . 13:70. 0.63' 3.60 0.19 . 7.00 0.89 10.40. 0.84 13:80, ' 0.62 3.70 0.20 7.10 0.95 10.50 0.83 . 13.90 0.62 III 3.80 0.22 7.20 . 1.02 10,60 ' 0.83 14.00 0.61 3.90 . 0.24 7.30' 1.11 10.70 0.83 14.10 0.61 4.00 0.25 7.40 1.22 10.80 0.83 14.20 0.62 4.10 0.26 7.50 1.34 10.90 0.81 ' 14.30 0.61 4.20 0.27 7.60 2.08 11.00 . 0.80 14,40. 0.61 4.30 0.29 7.70 -• 3.07 11.10 0.79 14.50 - 0.61 4.40 ' 0.30 7.80 3.53 11.20 0.77 14.60 0.61 4.50 0.32 7.90 3.73 11.30 0.76 14.70 0.60 " 4.60 0:33 8.00 . 3.74<< 11.40 0.75 14.80 0.60 , . 4.70 0.35' 8.10 3.20 11.50 0.73 14.90 0.60 4.80 0.37 8.20 2.46 11.60 0.71 15.00 0.60 4.90 0.39 8.30 2.05 11.70' 0.70 15.10 . 0.59 6.00 0.41 8.40 1.77 11.80 0,69 15.20 0.59 5.10 0.43 8.50 1.56 11.90 0.68 15,30 0.59 - I 5.20 0.46 8.60 1.51 . 12.00 0.67 15.40 0.59 5.30 0.48 8.70 1.51 12.10 0.67 . 15.50 0.58 5.40 0.51 8.80 1.43 12.20 0.67 15.60 0.58 5.50 0,53 8.90 1.35 12.30 0.68 15.70 0.58 111 5.60 0.54 9.00 1.27 12.40 0.68 15:80 0.58 5.70 0.56 9:10 . 1.18 . 12.50 0:69 15.90 0.57 5.80 0.58 9.20 1.11 12.60 0.68 16.00 0.57 111 I • Continues on next page... 1 I Library Site Post Development Page 2 Hydrograph Discharge Table I • Time - Outflow Time --Outflow - , (hrs cfs) (hrs cfs) I16.10 0.57 21.20 0.43 16.20 0.57 21.30 0.43 I 16.30 0.56 21.40 0.43 16.40 0.56 21.50 0.43 . 16.50 0.56 21.60 0.42 • 16.60 0.56 21.70 0.42 .: I 16.70 0.55 21.80 0.42 16.80 0.55 21.90 0.41 16.90. 0.55 22.00 0:41 i 17.00 0.55 22.10 0.41 • 17.10 0,54 22.20 0.41 • • 17.20 0.54 . . 22,30 0.40 17.30 0.54. 22.40 . 0.40 • I 17.40. 0.54 22.50 0.40 17.50 0.53 22.60 0.40 17.60 0.53 22.70 0,39 I 17.70 0.53 22.80 0.39 17.80 0.53 22.90 0.39 17.90 0.52 23.00 0.38 18.00 0.52 23.10 0:38 18.10 0.52 23.20 0.38 • 18.20 0.51 23.30 0.38 18.30 0.51 23.40 0.37 18.40 0.51 23.50 0.37 .I 18.50 0.51 23.60 0.37 18.60 0.50 23.70 0.36 18.70 0.50 23.80 0.36 . 1 18.80 0,50 23.90 0.36 . 18.90 0.50 24.00 0.36 19.00 0.49 19.10 0.49 i ..I 19.20 0.49 ...End 19.30 0.49 19.40 0.48 19.50 0.48 I 19.60 0.48 19.70 0.47 19.80 0.47 , I 19.90 0.47 20.00 0.47 20.10 0.46 - 20.20 0.46 I 20.30 0.46 20.40 0.46 20.50 0.45 I 20.60 0.45 20.70 0.45 20.80 0.44 ' • 20.90 0.44 . ' 21.00 0.44 21.10 •0.44 I r • Appendix C • ' Vicinity Map • Proposed.Facilities Map r . 1 r =1 . • • 1 r � • I i• • • . I I • r . r r rI r _7 .�, .• • c _ -•- ._ . )• !}yart r{�, r r' •7! Q. '(_---•' • . /V ' �! !• ,...,..,.../ •. s��' •o, �/�Ci/ \� IA`j /! , :4;41 k.., ! `'Ili • 5o_ t / b Ia, 11 -yI J 1 1 .� \ -�.��C�` T.1 "L`-.�."_�,/'/�/•�.'t tj. 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'1i 31 I { _ £tt,.`. i a f�•1.4.7 A' . 5629 • �e { s . ii''r l 1 l I ///'.� �'.=s-�I=�,� 'jl .7� rfll,h;S Iry �l �°I7. 4�/� I • J n _ ` � + 'fi�/� i• i f„ �� 1 j4• 101.. � Y. fi� , - ' «�� M •.�s .,,.:,7.• v t /of VA� 0.10 1�Y 00 ���� !�l11 ' 1 __.‘af E./.'-:LA-_—.- ;--"—:-.: .iitca , v`ves.c`'-)0.....:\ 04- a. sz) .1 :114t...:N: ---- -- -'-' -.'l -------vi - • .. 0 zoo ., 0. = 'e„ -°""'�'ate.. -il•. I e/ 'i 1 , •I ' .• As_4014 . i 1 c _ G xs F9 Vii! 'e.�..44.... Lam-, ) I 8 tie•�.iz �7]I�{T+�..i I,, () � 40,1 ,‘1 3=,�4� r a y iii Sq•t4-,;;N1�, �.i • i}c , `\\,✓ E.a;a ,may S'rr�d 7\' •)111 1 --/-a7, '� � �� .11,ik 4A s tft-, �'y' fs_->i .•, 't• . �l F'Iigh Sc / ' 333” RBI -. r: r--,. .!+ • 1 Appendix D 1 Water Quality Calculations I 1 I II I 111 1 1 1. I 1 1 1 MN MN NM MN OM MN In OM IMO MN MO Tigard Public Library Water Quality Calculations for Library Only 5127/03 Basin Area Characteristics Water Quality Area (acres) 1.99 Water Quality Flow(cfs) 0.2 Water Quality Volume 2496 Swale Dimensions Mannings N 0.24 Length (ft) 100 Longitudinal slope (ft.) , 0.005 Bottom Width 2 Side slope 4 in flow area Channel Depth (ft) . 2.4 Swale Design Parameters Flow Depth at WQ Flow. 0.35 Flow Depth at 25 year 1.37 Channel Area at WQ flow (ft2) 1.18 Channel Area at 25 year(ft2) 10.18 Velocity at WQ Flow 0.17 Velocity at 25 year 0.37 Freeboard (ft) 1.03 Detention time (seconds) 590 540 seconds required Tigard Public Library Water Quality Calculations for Library with Wall Street 5/27/03 Basin Area Characteristics • Water Quality Area (acres) 2.45 Water Quality Flow (cfs) 0.25 Water Quality Volume 2496 Swale Dimensions • • Mannings N 0.24 Length (ft) 100 Longitudinal slope (ft.) 0.005 Bottom Width = 2 Side slope 4 in flow area Channel Depth (ft) 2.4 Swale Design Parameters Flow Depth at WQ Flow 0.4 Flow Depth at 25 year ' 1.37 Channel Area at WQ flow (ft2) 1.42 Channel Area at 25 year(ft2) 10.18 Velocity at WQ.Flow 0.18 Velocity at 25 year 0.37 Freeboard (ft) 1.03 Detention time (seconds) 568 540 seconds required 1111111111111111111111111111111111. 1111111111111111111111111111111111111111111111111111 MOM S OM I 1 New Tigard Library ry Site Stormwater Conveyance I 5/25/03 I Line L-1 Area (ft2) Flow (cfs) Pipe Sze (in) Slope (ft/ft) Pipe Capacity (cfs) Area A 10832 Total 10832 0.671 8 _ 0.005 1 1 . Line L-2 1 Area B 10874 Total. 10874 0.674 6 0.01 0.65 I Line L-3 . Area B . 10874 Area C 15157 Total 26031 1.613 8 0.01 1.4 Line L-4 IArea B 10874 . . Area C 15157 Area D&J 9044 Total . 35075 2.174 10 0.01 2.6 . IL..5 Area B . 10874 I Area C 15157 . • Area D&J 9044 Area E 4683 ITotal 39758 2.464 • 10 ' 0.01 2,6 I • Line L-6 Area F 2250 ITotal 2250 0.139 6 0.02 0.9 Line L-7 IArea A 10832 . Area F 2250 Total 13082 0.811 8 0.005 1 • • I I 1 Line L-8 Area I 12781 Total 12781 0.792 12 0.01 4.1 Line L-9 ' Area I 12781 • Area H 32456 ' 45237 2.804 12 0.01 4.1 Line L-10 • • Area I 12781 Area H 32456 Area G 36025 81262 5.037 18 0.01 14 L11 All Areas 134102 8.312 Notes 1. Stormwater flow calculated using rational method and 3 Inch per hour rainfall intensit. 2. Pipe capacity calculated using manning equation with a n-value of.012 , • 11 • I 1 • 1 I 1 Appendix E Conveyance Calculations 1 1 1 ' i 1 1 1 '' • 1 . 1 1 1 1 1 1 . 1 . • . • MN NEI—,. MB MII UN IIIII . 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INC.■ �, I j . / 1 � - A. 11• �} a„ o-b.� �, / /1 (o,e f" / �''�- ''G�i `'' ' GRAPHIC 'SCAL N0gH . d. -I _ 60 0 30 80 120 r ) 0.46“-un l'•w7•,4-rar .+` :.. �►.;' Drainage (` I ►`r�► i -5.— L °,'-�A�- _ + � �i �r`�r "" ( IN FEET ) I r - j�`i�I;I��� •.a�� ---� �,\l. •`� ra8?6,.;s>�{ �01'�\,�`-,\ -...„ /! �i��r 1 inch = ET 66 ft. I .iii Of 11 a - NIS VIII MI Mill NM MI NIS MI MI MI MINI IIIIIII NIB IIIII OMB EXHII31T � HyPRAVUCMALY3IS I I] C HAAS Suite 300-AGC.Center . \'' >," t !;; 1J J_, �`�,�"� 9 50 SW k,Commerce 97070 Circle �` R� � Wilsonville,OR.97070 I -. a , n �` (503)682-2450 Xi al . ssoc:a es, Inc. (503)6824018 Fax ta ..: 't Consulting Engineers d Surveyors I .. ' March 4, 2005 / . "Inc.. CZ '. ' • Memorandum to File r � '��� Q' Wall Street Improvements - Phase 1 • Investigation regarding "no-rise" criteria IThis memorandum relates to the requirement that Phase 1 construction in the 100-year floodplain will not Y P cause an increase in flood levels during the base flood discharge. IDuring a previous study in July of 2003 by our Subconsultant, Oregon Bridge Engineering Company (OBEC), g g g P Y ( EC), related to costs of varying bridge lengths and approval requirements.of PEMA, OBEC retained West I Consultants(West) to prepare a Hydraulic Analysis Report related to the various bridge lengths. West performed extensive modeling of Fanno Creek extending above and below the proposed Wall Street alignment. IInasmuch as West had the extensive modeling resources available, we retained them to evaluate the flood level effect of the proposed Wall Street Phase 1 improvements and to provide certification of their findings. The resulting scope of work procedure and findings are attached. • As,indicated in the Scope of Work Phase 1 construction earthwork in the floodplain consists of 135 yd' of fill I and 1,076 yd& of excavation for a net total of 941 yd3 excavation. Accordingly, the Phase I construction enhances the floodplain storage function. I As certified by Christopher R. Goodell, P..E., Phase 1 construction as shown on the attached drawings would cause no-ri it ;an io Creek during a 100-year flood event, l ,i ' ✓1 W. ,A,l' Marlin J. D. -lam, P.E., P.L.S. President 1 . cc: 02.629.118 Vannie Nguyen- City of Tigard - I Geraldene Moyle-Group Mackenzie , Chris Goodell -West Consultants Exp. 12/31/05 I .\t‘tip i'ROFes� I iij'1!gitil..,,OREGON • RtlN.J, De�P I I SCOPE OF WORK, PROCEDURE AND FINDINGS • WALL STREET EXTENSION IMPROVEMENTS(PHASE 1) ' Scope of Work: Preliminary construction plans have been prepared for Wall Street Extension Improvements(Phase 1) which includes the 1'`425ft from Hall Blvd. easterly. The general grading improvements in the floodplain illustrated by the attached plan excerpts (Sheet 22) consist of 135yd3 of fill for the street construction(Area A), 217yd3 excavation of a berm(Area B), 167yd3 excavation of a berm (Area C), and 692yd3 excavation in a wetland restoration area(Area D). A centerline profile is also attached showing Phase 1 grading. The purpose of this assignment was to address Tigard Code 18.755.070 Sensitive Lands Permits ' (attached), particularly items 8.1. and 8.3., which follow, relative to Phase 1 construction. B;1. Land form alterations shall preserve to enhance the floodplain storage function and , maintenance of the zero-foot rise floodway shall not result in any encroachments, including till, new construction, substantial improvements and other development unless.certified by a registered professional eneineer that the encroachment will not , result in any increase in flood levels during the base flood discharge; B.3. Where a land form alteration or development is permitted to occur within.the.floodplain it will not result in any increase in the water surface elevation of the 100-year flood; Accordingly, our tasks were as follow: ' 1. Analyze the effect of the proposed Phase 1 construction to determine if or not such construction will meet the no-rise requirements of B.1. and B.3. 2. If the Phase 1 construction as proposed does not"meet the no-rise requirements, advise what design revisions are necessary to meet the no-rise criteria. 3. As stipulated in 13.1., certify(PE) that the encroachment of the construction as currently proposed, or as revised if necessary(task 2), will not result in any increase in flood levels during the base flood discharge. ' Procedure: The existing model (prepared for OBEC in the bridge-length study) was.run for 2 plans: '.1 • 1 + 1• The existing model with insertion of an additional original ground cross section at the proposed Wall Street alignment. ' 2. The existing model with insertion of an additional finish grade cross section at the proposed Wall Street alignment. ' Findings: • 1. Insertion of the additional original ground cross section(1 above) did not affect the base flood level. ' 2. The Phase 1 construction(2 above)lowers the water surface elevation by 0.12ft. at the additional Wall Street alignment cross section(2 above)and 0.30ft. at cross section AG, located approximately 1,000ft. upstream. ' Accordingly,the no-rise condition is met. Certification: 1 Phase 1 construction as shown on the attached drawings would cause no-rise in Fanno Creek during a 100-year flood event. i PROFF e soin k, 52293 9 _ c MOON <5`),GAY 13, No% wv OpkeR R•Gv EXPIRATION DATE.,E • 1 1 I I i t fI 1 2 1 \, I 5 E II lIlIlI ll - !1ice � ,� ''' : ';_ ,�_fit \ 1► •�QiI i1��\ ►�-WOiwi#3a _II4 w { ! - ----,�-4,.r � �.��►����_— ..�� IME M /11/ 1721 4; - `s,-.4w.--4- 2414' , �_.--- Li— -_-.=�''►-- aaLiI( i 1tiIiirT,_ • ,� (11MEll -ice----J`, tJ III o.., i`} Lag a• ''IR. �����_DDDDDDr■-� . ;\1 .,,, ) , ,\( k4,41!> z Autwanor ' 1111111111Wi 111 i•-it A 1 \ is iii., -/ . , ,.. :. s ili i I amnia -: ft 'imffirmums 0 , -,, , \? , 1 ../.. 4,r liii ''''1:ATatilli ihit 'N . tQ..S .� �,� ! 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' 7(36 •Q- • - - - - - - - - - - - - - — - - - — — • • I . • HYDRAULIC ANALYSIS REPORT for PROPOSED BRIDGE FOR SW WALL STREET OVER FANNO CREEK iWASHINGTON COUNTY, OREGON I. 1 Prepared for: i OBEC Consulting.Engineers 920 County Club Road, Suite 100B Eugene, OR 974'01 1 Prepared by: ' WEST Consultants,Inc. 2601 26th Street, Suite 450 Salem, OR 97302 (503)485-5490 1 July 9, 2003 1 1 1 , r , TABLE OF CONTENTS 1. INTRODUCTION 1 2. HYDRAULIC ANALYSIS 1 ' 3. RESULTS 3 4. CONCLUSIONS 8 I LIST OF TABLES Table 1.—Results for the Base Flood Event 4 Table 2—Results for the Floodway Event 5 I' Table 3 Floodway Results for the Various Bridge Alternatives. 6 APPENDIX 1: FIGURES FIGURE 1 Bridge Location Map 1 FIGURE 2 Cross Section Layout • FIGURE 3 Cross Section Plots FIGURE 4 100-year Water Surface Profile for Plan 3 FIGURE .5 100-year Water Surface Profile for Plan 4 FIGURE 6 100-year Water Surface Profile for.Plan 5 FIGURE 7 100-year Water Surface Profile for Plan 5b FIGURE 8 Floodway Water Surface Profile for Plan 3 FIGURE 9 Floodway Water Surface Profile for Plan 4 FIGURE 10 Floodway Water Surface Profile for Plan 5 FIGURE 11 Floodway Water Surface Profile for Plan 5b FIGURE 12 Comparison of 100-year Inundation.Boundaries I FIGURE 13 100-year Inundation Boundaries for 1'lan 5 • 1 1 1 i i I ' 1. INTRODUCTION 1. OBEC Consulting Engineers is currently working on the design of a e proposed bridge g for SW Wall Street over Fanno Creek, The proposed bridge would be located within a regulated floodway. Therefore, the local community and Federal Emergency Management Agency (FEMA) must be involved in the approval process for this project. The project would have to be submitted to FEMA as a Conditional Letter of Map Revision (CLOMR). Mr. Gayle Harley of OBEC Consulting Engineers requested that ' WEST Consultants, Inc. conduct a.hydraulic analysis of various bridge configurations for the proposed structure to assist OBEC with this process. Information about the hydraulic analysis and the results of the anlysis are documented in the following paragraphs of this ' brief report. • 2. The location of the proposed bridge is shown in.Figure 1, The proposed bridge will be located within the City of Tigard, Oregon, approximately 3.8 miles upstream of the • confluence with Tualatin River and about 1,430 feet downstream of the existing bridge for Hall Boulevard, which is labeled as SW 85th Avenue in Figure 1, 2. HYDRAULIC ANALYSIS • ' 3. Arevised Flood Insurance Study (FIS) of Fanno Creek has recently been completed by Pacific Water Resources, Inc. as part of a watershed assessment study of the Tualatin Basin. The study reach for the FIS extended approximately 13.5 miles upstream from the confluence with Tualatin River, The hydraulics for the FIS were computed using the US Army Corps. of Engineers HEC-2 Computer Program, Version 4.6.2, dated May 1991. ' The HEC-2 model and all of the supporting data for the FIS are currently available from FEMA's Contractor, Michael Baker Jr., Inc. Unfortunately, it would take several months to obtain this information from Michael Baker Jr., Inc. Therefore, WEST Consultants, ' Inc. contacted Pacific Water Resources, Inc., who did the FIS, and obtained a copy of all the data submitted to FEMA for their final submittal. Their submittal included base maps, work maps, report, hydraulic model,. ground TIN, and other supporting data. It ' should be noted that as the FEMA contractor, Michael Baker Jr. Inc., may have modified the submittal and certainly completed the final mapping. This data would have to be obtained from FEMA for the final CLOMR submittal, WEST Consultants, Inc. has contacted Michael Baker Jr:, Inc. and initiated the process of obtaining the effective data for Fanno Creek. 4. The HEC-2 model developed for the FIS was utilized to create a Duplicate Effective ' Model (DEM) required for the CLOMR. The DEM is a copy of the hydraulic analysis used in the effective FIS. The DEM was developed using the US Army Corps of Engineers HEC-RAS Computer Program, Version 3.1, dated November 2002 since this- - ' program has more advanced and improved bridge routines for evaluating the proposed SW Wall Street bridge. The model was developed by importing the HEC-2 model developed for the FIS into HEC-RAS for the reach from the upstream side of the Bonita • SW Wail Street Bridge over Fanno Creek Hydraulic Analysis of Various Bridge Plans ' WEST Consultants,Inc. June.I I,2003 Page I 1 , I o Road bridge to the downstream side of Main Street. This reach and the cross sections • located within the reach are shown in Figure 2. Plots of the cross sections are provided in I 1 ' Figure 3. For the DEM, the default setting (At Breaks in n Values Only). for. the . Conveyance Calculation Option within HEC-RAS was changed to the same method used for HEC-2 program (Between Every Coordinate Point) to obtain the same results as the • current effective FIS model. The starting water surface elevation for the DEM was based 111 on the HEC-2 model results for the cross section just upstream of Bonita Road bridge, and the elevations for the various flood frequencies are provided as follows: Return Period Starting WS Elevation(ft) . I • 10-yr 136.84 50-yr 138.02 . 100-yr 138.45 100-yr Floodway 138.84 500-yr 139.57 5. In addition to the DEM, a Corrected Effective Model (CEM) is required for the I CLOMR. The CEM is a model that corrects any errors that occur in the DEM, adds any additional cross sections to the DEM, or incorporates more detailed topographic information than what was used in the current effective model. The CEM was developed I by.incorporating the cross sections at the downstream and upstream side of the proposed . . bridge, These cross sections were provided by DeHaas & Associates,. Inc., who performed all of the survey work for this project. The cross sections were developed by • ' extracting the cross section front the digital terrain model (DTM) of the area and incorporating'the data obtained from the field survey.of the main channel into the cross section. Plots of these cross sections,are also included in Figure 3. As shown in the I plots, these cross sections. have ineffective flow boundaries to account for the sudden expansion of flow caused by.a berm located upstream at Cross Section AF. This berm is. • shown in Figure 2 and reflected in the cross section plot of Cross Section AF in Figure 3. • I • The ineffective flow boundaries within the left overbank were set to become effective • when the berm was overtopped, The contraction and expansion coefficients for the two new cross sections and for Cross Section AF were increased from 0.2 and 0:4 to 0.3 and . I 0.5, respectively. The stations for the floodway encroachment at these cross sections were originally defined using the workmaps provided by Pacific Water Resources, Inc. ' However for the reach immediately upstream of the proposed bridge, the boundaries needed to be revised to ensure that the rise associated with the floodway would be equal to or less than 1.0 foot. The revised boundaries are provided in the following table, and they were used in the hydraulic analysis of the various bridge plans:. • , Original Floodway Boundaries _ Revised Floodway Boundaries Cross Section Station of Left ' Station of Right Station of Left Station of Right Encroachment 'Encroachment. Encroachment Encroachment. D/S side of Proposed Bridge • 213.45 504.7 199 521 U/S side of Proposed Bridge 206.3 484.1 195 • 525 Cross Section AF 567 868 565 ' 870 Notes: I.Original Floodway Boundaries corresponds to the boundaries established in the FIS conducted by Pacific Water Resources,.Inc. . 2,Revised Floodway Boundaries corresponds to the boundaries established for the Corrective Effective Model. ,. 1 SW Wall Street Bridge over Fannp Creek Hydraulic Analysis of Various.Brides Plans WEST Consultants„Inc. I June 11,2003 Page 2 I I l 1 6. As directed by Mr. Harley, the following plans were considered for the proposed bridge: (1) Plan 1 — Bridge with a total span of 560 fl;..(2) Plan 2 —Bridge with a total o span of 400 ft; (3) Plan 3 —Bridge with a total span of.320 ft; (4) Plan 4 —Bridge with a total span of 240 ft; and (5) Plan 5 — Bridge with a total span of 160 ft.. A hydraulic I model was developed for each of the plans by incorporating the bridge configuration into the CEM. Generally, the bridge configuration was the same for each of the plans. The only difference between the various plans was the total span length. For each of the plans, the high chord of the bridge deck was defined using the top of road profile ' provided in the AutoCAD file (WALLST051603.dwg) provided by Mr. Harley on May 19, 2003; the low chord of the bridge deck was set at 40 inches below the high chord; the span lengths were assumed to be 80 feet; and the piers were assumed to 16-inches-wide. ' 7. Mr. Harley indicated that the preferred alternative would be the bridge with g the shortest span length, i.e., Plan 5. As discussed below, the backwater from this plan ' would extend upstream of Hall Blvd, which is undesirable. Thus, a modification to this plan was considered to make it a viable option. The modification involved excavating the berm at Cross Section AF from elevation 142 ft to-1.40 ft, and it is presented in this ' report as Plan 5b. Mr. Harley also indicated that a library would soon be constructed on right hand side of the creek immediately upstream of the proposed bridge (near.Cross Section AF). Thus, the water surface elevation upstream of the proposed bridge at Cross Section AF must be below the.design base floor elevation of 143.5 feet. 3. RESULTS • • 8. The results of the hydraulic analyses are summarized in Tables 1 through 3 and depicted in Figures 4 through 11. The results for the base flood event,which corresponds ' to the 100-year flood event, are provided in Table 1. The shaded area provided in this table reflects the reach of the creek where the base flood elevations would be increased, and it represents the extent of the backwater associated with the proposed bridge plan. ' The results for the floodway event are provided in Table .2, and the results of the floodway analysis for the various bridge alternatives are provided in Table 3. The water surface profile for the base flood event for Plans 3, 4, 5, and 5b are provided in Figures 4 through 7, respectively; and the floodway water surface profile for PIans 3, 4, 5, and 5b are provided in Figures 8 through 11.,respectively. Profiles were not provided for Plans 1 and 2 since they would not..be noticeably different than the profile for the CEM shown in • Figures 4 through 11. • SW Wall Street Bridge over Fanno Creek ' Hydraulic Analysis of Various Bridac Plank WEST Consultants,Inc. June I I,2003 Page 3 Table 1-Results for the Base Flood Event. WS El for Plan I(Span of 560 ft) I Plan 2(Span of 400 11) Plan 3(Span of 320 ft) Plan 4(Span of 240 ft) Plan 5(Spam of 160 ft) Plan Sb(Span of 160 ft) Cross Station Without- Sxtior, Project WS (ft) Change in WS WS El(ft) Change in WS El(ft) Change in WS El(ft} Change in WS El(ft) Change in WS El(ft) Change in (fl) El(ft) WS El(11) WS El(ft) WS El(ft) • WS El(ft) WS El(ft) - - A13 15320 1385 1383 0.0 I 138.5 0.0 1385 0A j 1383 0"0 138.5 0.0 1383 0.0 AC 16224 138.7 138.7 0.0 138.7 0.0 138.7 1 0.0 1383 0.0 1 1383 0.0 1 1383 1 0.0 AD 18358 140.3 I 140.3 0.0 I 1403 0.0 1 140.3 0.0 140.3 0.0 1403 0.0 1403 1 0.0 AE 19928 141.2 1412 0.0 1412 0.0 1412 0.0 I 1413 ' -0..1=r s:1 141.3 i`'Y,_ 0 tA 1413 :y 171,1:='= 20123 141.4 ; 141A 0 0 I 141.5 0,1 I 141$ 0.1. 141.6 „ 02=;' >,' 141.6 (h.2' ::?;' 141.6 _03.s: y' 20175 141.4 1 1413 0.0 141.6 0.2 141.7 02' + 141:8 _ ^:0,4;:.";.F 142.0 105 =?i 1420 - t t0 5 ';-.a ' AF' 20298 141,4 141.5 ..0.1• 1413 02 141.8 0.4 •/ 142A ;- U;6tc i�:=..' 142.4 :' 11?4 t.&:! 142.4 ;,.4.1 0 AG 21352 I 143.8 143.8 0.0 143.8 0.0 143.9 . • 0-1.';:' I44,0 =.°%rt02.r;,zl 144-1 k , `: :.; • 03 "K' 143.8 0.0 AH 21597 144.0 144.0 ' 0.0 144.0 0.0 144.1 :0:1•.:.'•,;x', 144.1 -:>:,-.9- r''Y 144.2 °1:03c.. : ; 144.0 I 0A Al 21716 144.1 1 144.1 0.0 144.1 0.0 1442 0.1 :.:-r 1443 .5.",;,:1::::,.W.:-...,,I.1 144.4 :1:1:03 `,C= 1 144.1 I 0.0 AJ 21717 I 143.9 143.9 0.0 144.0 0A 144.1 :,03.....,:: ; 144.1 •g;.7.:-..;',.4.-14.;q'-.4., 144.2 'i-i lt3.41' 143.9 I 0.0 . .c ll Blvd.a H . AK 21791 I 1443 • 144.5 0.0 1443 0.0 1445 0=0 144:6 ':"'...,'.4.4.:14::?.:' _ 144.6 '^s =03_..4sl 1445 0.0 a T.r.:_...� 145.1 0.0 AL 21966 145.1 145.1 0.0 145.1 0.0 1452 0 0 145.2 0.0 1452 sr:_ ( ii: AM 22485 1453 I 145.5 0.0 • 1453 0.0 145.6 ' 0.0 145.6 0.0 145.6 0:1;x1::1. 1453 0.0 AN 22609 i 145.6 1 145.6 0.0 145.6 0.0 1453 0,0 j 1453 0A 1453 ::'.0_h: 145.6 0.0 AO 22618 1454 I 145.6 _ 0A 145.6 0.0 145.7 0_0 1453 0.0 145.7 ,.ii47l;;t,•.:,1 i! 1454 0.0 AP 22684 1453 145.7 0.0 1453 0.0 1453 0.0 1453 0.0 . 145.8 iF1` 145.7 0.0 AQ 23473 146.0 I 146.0 0.0 146.0 0.0 146.0 0.0 146.0 0.0 1 146.0 ..:.:=:4;1:' ;' 146.0 0.0 . AR 23562 146.0 146.0 0.0 146.0 • 0.0 • 146.0 0.0 I 146.0 0.0 146.1 -,0:1.: c•ij 146.0 0.0 AS 23563 146.0 146.0 0 0 146.0 0.0 146.0 0A 146.0 0.0 146.1 0.1 ;•`'. 146.0 0.0 AT 23571 146.0 146.0 _ 0.0 146.0 0:0 146.0 0.0 146.0 0.0 146.1 -: f). 1 • 1 146.0 0.0 AU - 23669 146.1 146.1 • 0.0 i 146.1 :,0.0 146.1 0.0 146.1 0.0 146.1 - ..01`: 146.1 0.0 AV 24821 146.8 146.8 0.0 1 146.8 I 0.0 1 146.9 0.0 146.9 0.0 I46.9 0.0 I 146.8 i 0.0 AW 24957 147.2 1472 0.0 1472 0.0 1472 0.0 1472 0.0 147.3 0.0 147.2 0.0 . AX 24966 147.3 147.3 0.0 147.3 0.0 147.3 0.0 147.3 0.0 1473 0.0 I 1473 - 0.0 AY 25025 147.4 147.4 0.0 • 147.4 0.0 147.4 0.0 147.4 0.0 147.5 0.0 147,4 0.0 ' AZ 26008 • 151.2 151.2 O.0 151.2 .0.0 151.1 0.0 151.1 0.0 151.1 0.0 1512 0.0 Notes 1.The proposed library near Cross Section Al?was designed with a base floor elevation of 1 foot above the effective floodway elevation of 1423 ft,i.e.,1433 ft. 2.The shaded area above corresponds to where the 100-year water surface elevations would be increased as a result of the proposed bridge plan. • • .- .i -- - r - NM r MO �i -_.� I O i� 11.11 • - - Table 2-Results for the Floodway Event. WS El for Plan 1(Span of 560 ft) Plan 2(Span of 400 ft) Plan 3(Span of 320 ft) Plan 4(Span of 240 ft) Plan 5(Span of 160 ft) Plan 5b(Span of 160 ft) Cross Without- -_ Station Section Project WS El(ft) Change in WS WS El(ft) Change in WS El R Change in WS El ft Change in WS El ft Change in WS El(ft) Change in ( {-- ( O WS El(ft) WS El(ft) (ft) O El(ft) O WS El R) O Ch El(ft) O WS El(ft) 1 AB 15320 1382 138.8 0.0 138.8 0.0 138.8 0.0 138.8 '0.0 138.8 0.0 138.8 0.0 AC 16224 1392 1392 0.0 139.2 r 0.0 1392 0.0 139.2 0-0 139.2 0.0 1392 0.0 AD 18358 1412 1412 0.0 141.2 0.0 141.2 0.0 1412 0.0 1412 0.0 141.2 0.0 AE 19928 142.1 142.1 0.0 142.1 0.0 142.1 ` 0.0 142.2 0.0 142.2 I 0.0 142.2 f 0.0 20123 142.4 142.4 0.0 142.4 0.0 142.4 0.0 142.4 0.1 142.4 0.1 142.4 0.! 20175 142.4 142.5 0.0 1423 0.0 142.5 0.0 142.6 0.2 142.7 0.2 n 142.7 0.2 AF' 20298 142.4 142.4 0.0 142.4 0.0 1424 0.0 142.7 0.3 143.0 05 143.0 0.6 . AG 21352 144.7 144.7 ' 0.0 144.7 0.0 144.7 0.0 144.8 0.1 144.8 0.2 144.4 -0.3 AH 21597 144.9 144.9 0.0 144.9 0.0 144.9 0.0 145.0 0.1 145.0 0.1 144.7 -02 i Al 21716 145.0 145.0 0.0 145.0 0.0 145.0 0.0 145.1 0.1 145.2 0.1 J 144.8 -0.2 Al 21717 145.0 145.0 0.0 .145.0 0.0 145.0 0.0 145.0 0.1 145.1 0.1 144.7 -0.2 Hall Blvd. OQ 1 AK 21791 1 145.1 145.1 0.0 145.1 0.0 145.1 0.0 1452 0.0 145.2 0.1 1 145.0 1 -0.2 r. v 1 AL 21966 145.6 145.6 0.0 145.6 0.0 145.6 0.0 145.6 0.0 145.7 0.1 145.5 -0.1 AM 22485 146.0 146.0 0.0 146.0 0.0 14.6.0 0.0 146.0 0.0 146.1 0.I 145.9 -0.1 AN 22609 146.1 146.! 0.0 146.1 0.0 146.1 0.0 146.1 0.0 146.2 0.1 146.0 -0.1 AO 22618 146.1 146.1 0.0 146.1 0.0 146.1 0.0 146.1 0.0 146.2 0.1 146.0 -0.1 AP 22684 1462 146.2 0.0 146.2 0.0 146.2 0.0 146.2 .0.0 146.2 0.1 146.1 -0.1 AQ 23473 146.5 1465 . 0.0 146.5 0.0 - 146.5 0.0 146.6 0.0 146.6 0.1 146.5 -0.1 AR 23562 146.6 146.6 0.0 146.6 0.0 146.6 0.0 146.6 0.0 146.6 0.1 146.5 -0.1 AS 23563 146.6 146,6 0.0 146.6 0.0 146.6 0.0 146.6 0.0 146.6 0.1 146.5 -0.1 i AT 23571 146.6 146.6 0.0 146.6 0.0 146.6 0.0 146.6 0.0 146.7 0.1 146.5 -0.1 AU 23669 146.7 146.7 0.0 146.7 0.0 146.7 0.0 146.7 0.0 146.7 0.0 146.6 -0.1 AV 24821 147.9 147.9 ' 0.0 147.9 0.0 147.9 0.0 147.9 0.0 1 147.9 0.0 147.8 0.0 AW :1 24957 148.1 148.1 I 0.0 148.1 I 0.0 148.1 0.0 148.1 0.0 148.1 0.0 I48.1 0.0 AX 24966 148.2 1482 0.0 148.2 0.0 148.2 0.0 148.2 0.0 148.2 0.0 148.1 0.0 AY 25025 148.3 148.3 0.0 148.3 0.0 148.3 0.0 1483 0.0 1483 0.0 I48.2 0.0 AZ 26008 1512 1512 0.0 151.2 0.0 1 151.2 0.0 151.2 0.0 1512 0.0 1512 0.0 Notes: 1.The proposed library near Cross Section AF was designed with a base floor elevation of 1 foot above the effective floodway elevation of 1425 ft,i.e.,1433 R. 2.The above results are based on the floodway boundaries established for the Corrective Effective Model that are based on the boundaries established for the FIS completed by Pacific Water Resources, Inc.with some minor revisions as discussed in Paragaraph 5. , I Table 3—Floodway Results for the Various Bridge.Alternatives. Cross Increase in the Water Surface Elevation above the Base Flood .ft t , Section • Station CEM Plan I Plan 2 Plan 3 Plan 4 Plate 5 Plan 5b - •AB 15320 0.4 0.4 0.4 0.4 0.4 0.4 + AC 16224 1 111111111111=1111 + 'AD 18358 ► +• • • AE 19928 ' ► 0.9 1:• uINlflHNH►AG t :AH :AI AJ AK 21717 0 1 i,0,6 1 1 1 AL 21966 1 1 0.5 0.4 1 1 0.4 i AM 22485 1 0.5 1 1 1 1 1 1 2 AN 2609 1 1 1 1 : 1 1 1 i.4 • 22618 ` 0.5 1 1 4 AP 1 EU t IIH.H 1 • 1 1 • + ' AR 1 . l e 1 0.6 1 . 0.6 + ° 1 ' AT I ISM + 0.6 . 0.6 0.6 . 1 El + I 23669 1 • 1 1 . 1 1 1 i AV 1 1 1 1 1.0 • AW 24957 1 ' 19 0.9 1 ' 1 1 ' 1 ' NOM 496 AZ =MI 0.1 0.1 Notes: 1.The increases provided above are based on the Base Flood Elevations(100-yr)associated with the proposed bridge plan and not the BFEs from the FIS completed by Pacific Water Resources,Inc. '2.The above results are based on the floodway boundaries established for the Corrective Effbctivc Model that are based on the boundaries I established for the FIS completed by Pacific Water Resources,Inc.with some minor revisions as discussed in Paragaraph 5, I SW Wall Street Bridge over Fanno Creek I • Hydraulic Analysis of Various Bridge Plans WEST Consultants,Inc. June 11,2003 I Page 6 I' i 9. The results provided in Tables 1 through 3 indicate the following: (1) the water surface elevation for the base flood event increases as the bridge opening decreases and the largest . increase is associated with the smallest bridge opening (Table I); (2) the increase in water surface elevations caused by the proposed bridge decreases when including the effective Iflodboundaries (Table I and 2); (3) for the base flood event, the backwater from the dway ' proposed bridge would extend upstream of Hall Blvd. for Plans 4 and 5 (Table 1); (4) the water surface elevation near the proposed library site, Cross Section AF, for the base flood event would I be less than the base floor elevation of the library (143.5 ft) for all of the alternatives (Table 1); (5) the floodway water surface elevation near the proposed library site would also be less than the base floor elevation of the library for all of the alternatives (Table 2); (6) excavation of the berm at Cross Section AF would offset the backwater associated with the .proposed bridge and I prevent the backwater from extending upstream of Hall Blvd. (Table 1); and, (7) the increase associated with the floodway would be less than 1.0 foot for all of the proposed bridge plans (Table 3). 10. The results also indicate that the base flood event would impact the left side of the bridge for I all of the proposed bridge plans except for Plan 5. Thus, the increase in the water surface associated with these plans can be reduced by raising the bridge deck near the left side to be above the base flood. Also, the increase in water surface elevations for Plans 1 through 3 could be offset by excavating the high ground between the main channel and the natural pond west of I the channel (Figure 3) for the reach near the proposed bridge (between.Cross Sections AF and AE). 11. To show the maximum impact the proposed bridge structure would have on the 100-year I''.. . ' -flood boundaries, the 100-year flood boundaries were delineated for without project conditions and for Plan 5. Spatial analysis within ArcView 3.0 was used to delineate the boundaries. I Briefly, a surface was created for both the water surface profile-and the existing ground. The surface for the ground was developed using the AutoCAD file of the TIN included in the FIS submittal by Pacific Water Resources, Inc. The surfaces were then converted to a grid and the I map calculator was used to define the areas where the difference between the two grids would be greater than 0. The map calculator results were then converted to a shape file. '12. The inundation boundaries defined using the procedure above with the effective BFEs I (based on the FIS submitted by Pacific Water Resources, Inc.) were compared to the boundaries developed by Pacific Water Resources, Inc. This comparison is shown in Figure 12. As shown I in this figure, there are some noticeable differences between the two boundaries. The FIS submittal by Pacific Water Resources, Inc. does not contain any discussions or information on how the boundaries were delineated. It is, however, suspected that they were established . I manually since there are some locations where the width of the delineated boundaries is different than the width from the hydraulic results-and there are no noticeable difference in the cross section extracted from the TIN and the cross section that was used in the hydraulic model. The difference in the two boundaries at the upstream end just downstream of Main Street is related to . I the difference in the cross section extracted from the TIN and the cross section reflected in the hydraulic model. ISW Wall Street Bridge over Fenno Creek ! Hydraulic Analysis of Various Bridge Plans WEST Consultants,Inc. I June I'1,2003 Page 7 • i • 13. The 100-year flood boundaries for the without-project condition and Plan 5 are provided in Figure 13. As shown in this figure, Plan-5 would not significantly impact the 100-year flood • boundaries upstream of the structure, and the.difference between the two _boundaries.exists is only noticeable for the reach between the proposed bridge and Hall Blvd. • • 1 4. CONCLUSIONS ' 14. A hydraulic analysis was performed on various Y Y p sous bridge plans for a new proposed bridge over Fanno Creek. The results of the analysis indicate that for all of the plans the base flood and . • floodway water surface elevations upstream of the proposed bridge would be less than the design base floor elevation of the library that will be constructed in the near future. The results also• indicate that the proposed bridge would have to have a span length of 320 feet to prevent. the • • increase in the base flood elevations (backwater from the structure) to extend upstream of Hall Blvd, and a 160-foot long structure could be used if the berm at Cross Section AF was excavated' • from an elevation of 142 to 140 feet. Finally, as shown in the delineation of the.100-year flood boundaries for Plan 5, the proposed bridge structure would not cause a significant increase in the 100-year flood boundaries upstream of the structure and the only noticeable difference would exist within the reach from the proposed bridge and Hall Blvd. • • • 1• • • '1• • • • • 1 1 ,1 • SW Wall Street Bridge over Fanno Creek , Hydraulic Analysis of Various Bridge Plans WEST Consultants,Inc. June 11,2003 1 Page 8 1 I , . ...,... . . . • • .. 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I I , .>:j,■, ,i'' I I FIGURE 3 —Cross Section Plots Fenno Creek-Wall Skeet -Plan:Existing Corrective Effective 5/2712003 AB 180- .057--- ? o .06 �- - --=— --- Legend 7 Ground Bank Sta 170- 160 150. 140- 130• 120• .0 200 400 600 800 1000' 1200 1400 Station(ft) Fenno Creek-Wall Street Plan:Existing Corrective Effective 5/27/2003 AC �C —.11-- � . < ,107, ' tom: 0 Legend 7 6 mound • • Bank Ste ' 145- ' a0+ .: 135. .. 1 130- ' 126- ' ... 1200 Y 200 400 600 600 1000 Station(f 1) 1; • 1 1 . I 1 • FIGURE 3 — Cross Section Plots (Cont.) 1 Fenno Creek Wall Street Plan:Existing Correctly)Effective 5/27/2003 I r L • . 1 j` 1 — tso- —..107 0 Legend $ ^,u` • I '1 Ground 156 Bank Sta I160- i .§ m . m • 60140; • I • 135• :1 • 130- 12$ 0 200 400 600 600 1000 1200 1400 1600 Station(It) Fan no Creek-Wall Street Plan:Existing Correctke'Effective 5/27/2003 Il AE tso 14 .083 d : Q55 0 Legend I' Ground • • 165 Bonk Ste 150- 0• 145 1 140^ I . 135 ' iii . 130• 125 , • r--v- . . . • . • 0 200 400 600 800 ' ' ' 1000 . , 1200 1400 Station(f t) ' IFIGURE 3 — Cross Section Plots (Cont.) Fenno Creek-Wa II'Street Plan:Existing Correctke Effective 5/27/2003 D/S s Ide of Proposed Wa ti•St.Bridge 083— -- +08)14-- 055....— . 146 Logue . • I. 144 O A Indf Bank Re• 142- 1 . 140- 138- . 3 m O 1 ' •0'' 134+ . I 1 132. 130- ' 128- „— .T,r_�__^� '• 0. 100 200 300 400 600 600 700 Station(I t} Fanno Creek•Wan Street Plan:Existing Correcti,e Effective 5/27/2003 • U/S side of Proposed Wall St.Bridge I 144- ` .083 -- �< .08--1 .. .065— ----* Legend —'--«---- 142- I •----y e Inefi wund • :v • Bank Sta 140 1 138- .r 1 't 134 132• i 1 ,30- , • 126 0 100 200 300 400. . . , 600 600 700 IStation(f1) • 1 1 I r I FIGURE 3 —Cross Section Plots (Cont.) I 1 Fenno Creek-Wall Sweet —Plan:Existing Corracti a Effective 5/27/2003 I •1 AF t • 155 .083 055 1 0 Legend • 8 ..._`-- Gmond 1B3- Bank Ste 145- t • • 140- 1 m 135- n 130- 125- • • 120- r••.0 200 400 600 600 1000' 1200 1400 • S lallon(f I) Fanno Creek•Wall Sweet Plan;Existing COrrectivQ Effective 5127!2003 AG • H __ ..083°.- ._ 0 . .055 �� 16s I8 `Lego—nT Omund . • Bank Sle 160; i . . 145 • • 1 • it . . , i 130- 125 _-r--,-_r- • 200 400 600 800 1000 1200 ' 1400 Station(fl) . 1 I . • • IFIGURE 3 — Cross Section Plots (Cont.) • . Fanno Creek-Wall Street Plan:Existing Correctly)Effective 5/27/2003 • 14 .083-- ---•—+..08 >l< .055----••> . 1 • 85- Legon3 Ground • Bank Sta.• • T 1 .. 14S 1 114 •0- . m 135 • 1 130- I12: --r • . ' 400 600 800 1000 1200 . . 1400 Station((t) li: : .1 . Fanno Creek-Wall Sleet Plan:Existing Duplicate Effective 6/27/2003 AH 1 083 +-.07 'I< 055 --4i 185 Leg end • • Glow's() I 150 Inalf Bank Ste • 145• " . 140• •- - 135 1 . ' 5 . 130- 125• 500 600 100 600 90 _�� 0 1000 0 1200 .. Station(It) . I I I • FIGURE 3 — Cross Section Plots (Cont.) I I Fan no Creek-Wan Street Plan:Existing Duplicate Effective 5/27/2003 I Al 1e0- ---:083— -.07->4----.055 >! Legend Around 1rS, Ind' • Bank Ste 160 1 0 145' .§ . 1 ei 140- I In 135- 1 - i' 30 125 I 400 600 BOD 100 BOD T 900 1000 1100 1200 Station(ft) Fanno Creek-Wall Street Plan:Exis ting Du plicate Effective 615/2003 I 1E0-, 14�.- --• .083___ - —__ - 14-.07-+ .055 91 —Legend I Ground 155- Indf • Bank Sta 150- e- 145 , V 01 . 140: I. I135- 130- 125 I 400 500 800 700 800 900 1000. 1100 r 1200 Station(f I) - I I- 1 I f \. ii , v FIGURE 3 — Cross Section Plots (Cont.) Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/52003 I UPFHiall Blvd.(DS)-SECTIONS are physically sketsed 63/100 diva 160 Ic .083 -----+—.074--.065----01 , Legend I Giound 155 I nef f Bank Ste 150 I 145 QY jl It 140• 1 I . 135-. I I 130 i I i '125----, -r- � 400 500 600 700 800 900 1000 1100 1200 Station(fly . I Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/5/2003 UPF Hall Blvd(DS)•SECTIONS aro physically skeNed 63/100 area II 60 --.084 — 4-- + .081--->1 Legend I ____!2 ___Oro d 155- Ind/ IBank SO 160- 145- ■ • .. f t 1 ,.�,: m 140- 1 • t 13. 130- I 126 400 500 600 700 800 900 1000 1100 1200 Station(It) • ■ i I i FIGURE 3 — Cross Section Plots (Cont.) • Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/52003 7 l I iso- .084 .>.-.07—)1< —.081 Legend . •G—tea• 155 Ineeff f Bank Ste • 150: , .c.' 145- , Di 140- . 135- I, 130; I, 125 400 500 600 • 700 800 900 1000 1100 1200 Station(f t) • Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6152003 • • , AL . --- - —.081---—�160 � .084 >1F.07 1( Legen I • Ground a 155- • Bank Sta 160; • 145 i, m 140; I' • I 135-• • ., 130- ti • e , 0 200 400 600 800 1000 1200 1400 Stallon(f 1) �; ii I . ill I. , ill ' '' . , • FIGURE 3 —.Cross Section Plots (Cont.) Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/5/2003 AM 180 - ,084 +.07+ .081 Legend I . Ground • 155. Bank SIa 150 § 145- . V di ' 140- I 135- I 130• .- . , • . . . -r---- 0 • 100 200 300 400 800 800 700 Station(f t) I.. . ' Fanno Creek-Wall Skeet Plan:Existing Duplicate Effective 6/5/2003 AN I 180- .—_ — ---.084-- —+07+ _ __.081— d Legend Ground Ineff 170 Bank Ste 160 g •■ to 150 I 140 A 1 _ 9 30 0 200 400 800 800 1000 1200 1400 1600 Station(f 1) . I 1 , FIGURE 3 — Cross Section Plots (Cont.) I 11 Fenno Creek-Wall Street Plan:Existing Duplicate Effective 6/52.003 UPFPoth-FC Park-Tigard 180-I( —.084 )I(07+ .081 Legend I U _ Inef1 170- Bank Sta . i 160:.. S a • to • 150; I vit I 140- • i I , 13°o 200 400 800 800 1000 1.200 1.400 1600 I' Station(f t) IFenno Creek-Wall Skeet Plan:Existing Duplicate Effective 6/52003 UPFPaIh-FC Park•Tigard 180-I� —.084 507 —,081— i Legend Ground Ind f 170- Bank Ste 160- 8 O ,160° I. ill . 130 , i 0 200 400 600 800 1000 1200 1400 1600 Station((t) I I 1 I .. '1 FIGURE 3 — Cross Section Plots (Cont.) I Fanno Creek-Wall Street Plan:Exisng Duplicate Effective 6/52003 • ao 180- I` •-.084 -+07+--- .081 41 Legend IIGround •• Ineff 170- Bank Sla 1140, A I 0 200 400 603 • , . , • ■ 800 1000 1200 1400 100 1 Station(f t) Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/5/2003 AP I180- 14 .084 - +.07- c..�— -.081 )1 Legoncl— Ground • 1 Bank Ste 170- , 160- I m 150- 1 140- 1 0 200 400 600 800 1000 IStation((t) • • I 1 1 FIGURE 3 —Cross Section Plots (Cont.) ' Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/512003 AQ ' .084. . -----.081— 160 7 Legend i ^ Ground 1 Bank St 150 ^ I a.5 41 - 140- • 135: 130 _•.0 200 400 600 800 1000 1200 1400 1600 Station(It) .. Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/52003 AR _ --.084— _)Jc07 . .091 160 Legend ;1 Ground 155 In• Bank Ste 150 .5 145.- - om 140- : 135- 130 0 200 400 600 800 1000 1200 1400 1600 Station(1 t) ' 1 I. ► • 11'. FIGURE 3 —Cross Section Plots.(Cont.) i • • Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/612003 . as . 160-, - --- C07><-- —.091 -H Legend . Ground Ia ' Ind f ' 166 Sank Sta • • 150 146 m 140 I II35. I --,--'—' - 1�.0 200 400 600 800 1000 1200 1400 1600 Station(f t) .,• .:,f Fanno Creek-Wall Sweet Plan:Existing Duplicate Effective 615/2003 UPFPath-FC Park-Tigard-RR Flatcar 60 004 "07 091 - Legond II Ground-- - —4! ►raf t • I 155: Bank Sta l 160- ti �. It 145; l . I ° 140-' 135- 1 130-0 200 400 600 800 1000 1200 1400 1600 Station(ft) I • I I . I ■ i I FIGURE 3 —Cross Section Plots (Cont.) 1 Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/5(2003 UPFPath-FC Padc•71gand.•RR Flatcar .084 . +°4 .091 H 160 Legend I Ground I 155- • Bank Ste III t r 150 a • 1 S V 145 , y ,. m �� 140- . i 135- . 133o 200 400 600 800 1000 1200 1400 1600 1 Station(f t) I, Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/5/2003 AT 1 160 .084 404 .091 L III egend —.— Ground A Ind( 165; Bank Ste , 150; ' 8% 145 • 140- 1 135^ 1300 200 400 600 800 1000 1200 1400 1600 Station(ft) !I I i ii I I •-) FIGURE 3—Cross Section=Plots (Cont.) . I! •r ! Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/5/2003 • AU . • 1 084 0 .` .091 7 Legend • Ground • Benk Ste 155- • . . . 150- I . 145 . 13 t"0 . f140 • 135 I 130• , -0 200 400 600 800 1000 1200 1400 1600 • Station(f t) . Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/5/2003 AV --•— .084 —— , +.07 -----.091 160 ogond Ground • • Benk Ste • I 155- I I a 150 , E3 • 145 I140 135 0 200 400 600 800 1000 . 1200 1 Station(f t) . I .Th . I • 1 : .) • • • . . FIGURE 3 —Cross Section Plots (Cont.) ... I I :_., • . . . . Fanno.Creek-Wall Street .Plan:Existing Duplicate EffectiVe. 6/50003 . • . . . .. .,.. . 1 . AW • .. 1 • • • fr . .084 . . 0 91----A 160- • Legend • . . —at— • . . I I• . • . • Ground .. 1 • • . ,i indf . .• . • . . . 155- - • • Bank.Sta • .. . . . II ? • . . • . I .. . . . • . . . .. 180- • r.-. , . . • .... g. . i • . . . • .• . a 3 • • , . .... . : . • . • "• ' . . •t 140.- • • . • • • I • • I • . . • III 0 • 200 400 800 800 - 1000 1200 . Station(ft) .. . • . - • , ;.• .... ) . .. Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/5/2003 . . I • Bridge#8 60- . .084 1 , +07+----.001--A • II Legend . . •--.4,— Ground . ' 4,— 'nett • .. • 155- • Sank Sta . . . . . ' . . . . , . . , 150, • ., I S ' - .. .(1) .. . - • . . .. . ED . . . 4 , . . • • . . . • . • - .' i . 1350 ' ' ' ---2(',0 '—r----'----'70-0 ' ' ' ' 800 ' ' ' '-800 ------7------1-0T00 ' ' ' ' 1200 • Station(f t) •• • • .. . , , . . . • . . . I . . ... ' • 1 • i• I s FIGURE 3 Cross. Section Plots (Cont.) Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/512003 II _ Bridge f18— 160- A84= 507)( 091--� Legend ii Otound t Inofr 155- • L Bank Sla Ii . -:• 150- - I m _ m 145- l o I I r 140J 1 1 I 135- . . . . , . . , . . . . . . . . . . . . . 0 200 400 600 800 1000 -T�1200 Station(ft) - I' I Fanno Creek-Wall Street Plan:Existing.Duplicate Effective 6/5/2003 1 nx 1 r 160+ 084 i07+ ---.091.----->1 Logond - Ground Inof f 1 155: enk a Sta I ■ I M- 1 145 r 140- , 1 35 r r-� 0 200 400 600 800 1000 1200 Station(ft) i • I I 1 1 FIGURE 3 — Cross Section Plots (Cont.) Fanno Creek-Wall Street flan:Existing Duplicate Effective 6/52003 ' AY 160- 084.------ — +.04 .091 Legend Ground Balk.Ste 155 1• 1 150_ . . a' 145 I 140- 135- . , 0 200 400 600 000 1000 1200 Station(ft) • Fanno Creek-Wall Street Plan:Existing Duplicate Effective 6/52003 AZ .08 — ---+-.085 + —.083_.—_.— Legend Ground S Bank Ste 155` 150- 5 1 It) 145- 140- ' 135- . -T- 0 200 400 800 800 1000 Stators(ft) 1 ON N ON r UN — BM — r I. S — an — MI UN _ Pill Fanno Creek-Wall Street Plan: 1) CEM 6/5/2003 2) B320 6/5/2003 - 148 Legend WS 100-yr-CEtyt 146 I WS 1c yr-832? Ground 1 144 _ --ter • daMO 142 f 140 1381 136 us 134 1 • �i • H - 130- . • 128 126 • • a> l')OO)) N c0 7 c0 b W (O 'N. O)' 1 N N N N N NN� e4 <' tf) t 1 N N R N N 124 - .. - • . 6000 .. 8000 Main Chancel Distance(f t) . FIGURE 4-100-yr Water Surface Profile forPlan3. . • • Fanno Creek-Wall Street Plan: 1)CEM 6/5/2003 2)8240 6/5/2003 K •FennoWailSt- — 148- . Legend `� S 100-yr-CE• 146-1 100-yr-824s I • i- --- Giound 144- 142 T . 140 138" v 136 . m 134 132-1 130- 128- , 126 co via. s ,,,N 40 '47 O t0 W C l`, N 01` �N O-<- M o ,z P. 2 c ° q 7 2 2 C�CI V N N N N N N N M n 124 5000 6000 7000 8000 9000 Main Channel Distance(it) FIGURE 5=- 100-yr Water Surface Profile for Plan4. . . MI — MI MN MI r NM — MI MN MI in -- — UM MO MS MI UN MI MB 11111 MN 111111 M 111111 E r In IIIII IIIIII 111111. MIN MN Fanno Creek-Wall Street Plan: 1) CEM 6/5/2003 2) B160 6/5/2003 -- - - —- -- -- -..— - Fanno Watt St :-.... 148 Legend S 100-yr-CEI • 146 -— --,.- 1jVS 1C0=Yr-B16 Ground 1 142 r 140 138' ! 136 134- a i 132- • 130- • • . i i 128 126 co ai of b 1=7. t- e O' RR. N N N N lV . N NV N 4 g 124 - ` 0 6000 7000 8000 9000. Main Channel Distance(ft) FIGURE 6- 100-yr Water Surface Profile for PIan5. • - . • • T ° , _ Fanno Creek-Wall Street Plan: 1)CEM 6/5/2003 2)Plan 5b 6/6/2003 • - FannoWallSt- - 148 Legend WS 100-yr-CEM •146- WS 100-yr-Plan 5b s Ground . I' 144 — • f 142 . 140 138- o • co 1361 o W 1 1341 I 1 1321 1301 . 1 . • 128 . . 126- m �� 0 CV 05 _ NN •N N N N Q1 N N CV CV ('Si ('Si ('Si N 124 . . -. -. 1 5000 6000 7000 • 8000 9000 Main Chanel Distance(ft) FIGURE.7 - 100-yr Water Surface Profile for PlanSb. . aMI MO MI S MI r MO — • Mr r MI — MI MI MI N Fanno Creek-Wall Street Plan: 1) CEM 6/5/2003 2) B320 6/5/2003 + 1 -Fenno Watt St• — - . 148- W • Legend ' 5100-yrFWr-CE • 1461 • it 100-y r F Wr-83 Ground l 144A _ 142- H f . 1381 136- H • ru :: . • ] • ,301 • • ,23 • 126 i 2'' • N- N ti m t(�ppO i2pp7 pp� �R�pp C�pp 0�pp Qom) 88 11A CD V. O> <O (D 10 fD 124 N N N N N 'N N N N R N • 5000 6000 7000 8000 9000 Main Channel Distance(f t) • . • FIGURE 8=Floodway Water Surface Profile for Plan3. • - Fanno Creek-Wan Skeet Plan: 1)CEM 6/512003 2)B240 6/5/2003 I —, FannoWatlSt 148j t� —.. ._—. Legend WS 100-yrFWr-CEM 146- WS 100-yrFWr-8240 Ground 144 142 140- - ' 40- ' 138- - i ° > 136- ° w 1341 ... I 1321 I • t ■ ."9 130 128 . • 126 co c,m a N h CO Q CO CO a, a ei �Np orb tn ' NN N N N N N N N N N N 124 T , 5000 6000 T00O 81700 9000 • Main Channel Distance(ft) • FIGURE 9 L Floodway Water Surface Profile for Plano. MN NM Sill MIII NO MO 1111111 1.111111111111111111 •11111111111111111111111111111 =1 MI NM MS In MI ON 1 OM I MI OM N • MN MI i .ONII M MB = • • . 4 Fan no Creek-Wall Street Plan: 1)CEM 6/5/2003 2) B160 6/5/2003 • 148 Fain°WaU St"-- -- 1 Legend •S 1C0.yrFWr-CE 146 —. - 1— S 100-yrFWr-8161 �� . G a mand • 144 r ?42 r • • 140 . • 138- m ?36 .. J 134- "" • 132- 130- - 128- - • • ' 126- . _ co [;)O) fO �Np m VI 0, O l7 �0 N- n W v t0 (000 `:V 124 CY . _ - N N N N N fV N 'N N 5000 6000 7000 8000 •Man Channel Distance(ft) FIGURE 10—Floodway Water Surface Profile for PlanS. • • Fenno Creek-Wan Street Plan: • 1)GEM 6/5/2003 -2)Plan 5b 6/6/2003 148- —Fanno Wall St - 'I Legend - S'-100-yrFWr-CE • 146- S 100-yrFWr-Plan - �� Ground. • 144 .�� . 142 ---� • 140 1381 c —.-°� 136- . m . to . • 134 132- —i 130- i 128 126 • q PiQ> eV I, CO tt AO ��np ppw mr P1 ctlY �(pC - N 83 V t0 tD ~ s CO N N eV N N N (V N N g 124 T , I 5000 6000 7000 8000 9000 Man Channel Distance(ft) FIGURE 11--Floodway Water Surface Pro.file for Plan5b. • • • • -- ONIIIIIIIIIIIIINIIIIIIIIINIONIONIIIII— a— • r I . It ti �3;' / ,, • ,,, ' k ,i +ps„. .,,,.,>;..:,:,,,,,,cclie•,,,,,,,,;.:::::_:;ace,:. .1'....\,\,....\\., ...,":1'''''''';i:;;:',.., ii''.1,.......0.0..e:';:ai,..i,\'‘\‘'\‘\■:''..\;:::( fir!• ''/ ^= .. •. !II I Iirri--..- 7-s.'27,,t ' • r? 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'`14:'^ ` -)i'.1i'' Fes+ 1 , . !'� -� • _ _ is ? �: r.•>:,/. .. • : • ••,.` ,� - _ t I00 r Inundation Boundaries for without J /• �. '-tee � project conditions r.• `: ` y\ 100r Inundation Boundaries for Plan 5. • ),„..0 y `�� \\:,!".,,- # s i-- /''.} -+r) ; 1 •_4�•-- 1• %4 .. •/ t.`cam`%. % .`'!- f• ��--''Sr .l '� �; - 1 -. % .'t -. 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',1.t .1” -_- -,`4',, :�'' �I 'ri, 5 .'i' .� •1 f /.. .a�f• � d si I • �%��q `-�"{ - 71 ri'ASCa , °7`6 `' �f, --r._7_21 -,tli 1_'f...r -•,.-- ..t.... .iiir.,„.....--, EA-A "- ..,;.'%',., I '!—77",.%--7';,....'" .---7---. i I (. ,..1 / - -*". ._^.'",......-. ,.\.•\ 1 1 .'j I •' , / -• •k ..`- . o t-..•t*-i 4 '. llr,,+• `.T4,.:,:-..t.V 171 . .:LJ ' +\\t`, . • • • • FIGURE 13— 100-year Inundation Boundaries for Plan 5.. - • • • MN • MI • • IIIIII 1 Sq1113IT VJ CW 3 &aRVCE ? oVi PER. LETTE-1 i r 1 I `. ' 1c ..` , : • • . 'i is , . "E.. °, ,, '11,°,, Poitlat'd Offictt . •r • .:.. ninrconsiXle* 9or'v11a= I •. .-;-----<'. . .` - ' d34 NW h Avenue,Suite 304 , � W 5ixt ©, ., �:...: �•;.. .;• ;� . Portland,Oregon 47204 .� P �8 f'• :•-,,q'DI 4k.914,PF `t Tel 503.224.03 Fox 503,224.1851 't - wv w.9w,acorn I .. Rt,3G..-f :.i;" CHYIRQNMiii'IAL CON4ULX(NTS c • 4r I i1 . • IDate: November 23, 2005 To: Astrid Dragoy, Clean Water Services I Cc: Varinie Nguyen, City of Tigard . Marlin DeHaas, DeHaas&Associates Geraldene Moyle, Group Mackenzie . I From: Stacy Benjamin, Senior Wetland Ecologist Subject: City of Tigard Wall Extension, Phase 1 Redesign Request for Revised Service Provider Letter; CWS File No. 4203 I . INTRODUCTION AND BACKGROUND INFORMATION The Portland office of SWCA Environmental Consultants (SWCA)1, under subcontract to DeHaas and Associates, is applying for necessary local, state and federal.permits for the City of Tigard's proposed Wall . I Street Extension project. A Service Provider Letter was issued for the project on December 21, 2004 (CWS . File No. 4203). Phase 1 of the project was recently redesigned to meet the local planning requirements of the City of Tigard. The redesign of Phase 1 involves reducing the length of roadway from 425 feet to 360 tfeet and shifting the library access and Fanno Pointe Condominiums access to the west to avoid development within the 100-year floodplain, The length of Phase 2 has been correspondingly increased by 65 feet at its western extent. The overall length of the proposed project is unchanged from the previously : ' Ipermitted design. The redesigned Phase 1 includes a retaining wall along the eastern edge of the Fanno • Pointe Condominiums access to minimize the amount of wetland and vegetated corridor impact. I REVISIONS TO THE PROPOSED VEGETATED CORRIDOR IMPACTS - . Due to the reduction in the length of Phase 1, proposed vegetated corridor impacts for Phase 1 have been reduced from the previously permitted 24,274 SF to 18,429 SF. Proposed Phase 2 impacts have been I increased from the previously permitted 18,610 SF to 22,305 SF. The total proposed project impact is. 40,734 SF, which is a reduction of 2,150 SF from the previously permitted Impact. The reduction in impact is due to the fact that the Fanno Pointe Condominiums access has been shifted to the west further upslope Iof the sensitive area, and a retaining wall was added to further minimize encroachment. The previously ... - proposed and currently proposed vegetated corridor impacts';are summarized in the table on the following page. The revised site plan and currently proposed vegetated corridor impact areas are shown in Figure 1. - 1 f .' 1 The Portland,Oregon office of SWCA was acquired from Fishman Environmental Services in 2004. I . ,I Wall Street Extension,Phase 1 Redesign Request for Revised SPL November 2005 REVISIONS TO THE PROPOSED VEGETATED CORRIDOR MITIGATION PLAN " Vegetated corridor mitigation for the project consists of vegetated corridor" replacement as well as vegetated corridor enhancement. The Phase 1 and Phase 2 vegetated corridor replacement and- enhancement areas are summarized in the table below. Vegetated corridor replacement and enhancement areas are shown in Figure 1, and planting specifications tables follow at the end'of this section. • TABLE 1. SUMMARY MMARY OF PROPOSED VEGETATED CORRIDOR IMPACTS AND MITIGATION Previously Revised Proposed Mitigation Phase Proposed Impact Buffer replacement Buffer enhancement I Impact - Phase 1 24,274 SF 18,429 SF 18,829 SF 28,217 SF • Phase 2 18,610 SF 22,305 SF 22,305 SF 6,025 SF TOTAL 42,884 SF 40,734 SF 41,134 SF 34,242 SF I Invasive species removal will occur prior to plant installation, and any bare soil areas greater than 25 square feet will be seeded with the seed mix In Table 2 below. t Phase 1 Plantings ' - The vegetated corridor enhancement area adjacent to Phase 1 of the project and located west of Fanno Creek totals 28,217 square feet (areas 3, 4, 10, 17, 18, 25 & 26). The Phase 1 vegetated corridor replacement area is located both west and east of Fanno Creek (areas 1, 2, 6, 8, 35 & 36) and totals 18,829 SF. The vegetated corridor replacement and enhancement areas will be densely planted in order to meet CWS plant spacing requirements. Plant quantities for this area.include 482 trees and 2,411 shrubs. Phase 2 Plantings The vegetated corridor enhancement area adjacent to Phase 2 of the project is located both west and east of Fanno Creek and totals 6,025 SF (areas 14, 19, 28 & 29). The Phase 2 vegetated corridor replacement ' area is located east of Fanno Creek and totals 22,305 SF (areas 34 & 37), The vegetated corridor replacement and enhancement areas will be densely planted in .order to meet CWS plant spacing requirements. Plant quantities for this area include 272 trees and 1,358 shrubs. Plant quantities are in accordance with Clean Water Services Design and Construction Standards, Resolution and Order 04-9. Appendix D (Landscape Requirements) of the Design and Construction standards specify that trees shall be planted at 10 feet on-center, and shrubs shall be planted at 4"to 5 feet on-center. . Ii TABLE 2. VEGETATED CORRIDOR SEEDING& PLANTING MIX" Scientific Name Common Name Type Rate/Spacing ' Achillea millefollum common yarrow Seed 2 Ibs/acre i Bromus carinafus California brome Seed 15 Ibs/acre I • Elymus glaucus blue wildrye • Seed 10 lbs/acre . SWCA Environmental Consultants Protect 10170-199 Page 2 IWall Street Extension,Phase 1 Redesign Request for Revised SPL. I. November 2005 TABLE 2.VEGETATED CORRIDOR SEEDING & PLANTING MIX " I Scientific Name Common Name . Type RatelSpacing • . Festuca roemer! Romer's fescue Seed 8 lbs/acre Ia ft centers In shady area south of wetland Polystichum sword fern Propagules creation area between.West Pond and Fanno imunitum (50 total) Pointe access TABLE 3.VEGETATED CORRIDOR TREE&SHRUB PLANTINGS r Scientific Name Common Name Size! Spacing** Planting Location Quantity IHeight* (on center) j Acer macrophyllum big-leaf maple 2 gallon/ 10 feet . Phase 1 181 3 feet Phase 2• . 106 I. . Amelanchler Saskatoon 1 gallon/ 4-5 feet Phase 1 9 300 alnifolia serviceberry 2 feet Phase 2 150 I Mahonia aquifolium tail Oregon 1 gallon! 4-5 feet Phase 1 437 grape 6 Inches Phase 2 . 269 Holodiscus discolor oceanspray 1 gallon/ 4-5 feet Phase 1 300 _ 1.5 feet _ . Phase 2 150 IOemleria Indian plum 1 gallon/ 4-5 feet Phase 1. 300 cerasiformis 1.5 feet Phase 2 150 Pseudotsuga Douglas fir 2 gallon/ . 10 feet Phase 1. 181 ' . menzlesil 3 feet _ Phase 2 106 Quercus garry Oregon white 2 gallon/ 10 feet ana Phase 1. 60 I oak , 2 feet Phase 2 30 Rhamnus cascara .. 2 gallon/ 10 feet Phase 1 - 60 I purshiana 2 feet Phase 2 . 30. Ribes sanguineum red flowering 1 gallon! 4-5 feet Phase 1 200 currant 1.5 feet " Phase 2 100 Rosa woods!! Woods rose 1 gallon/ 4-5 feet in Phase 1 437 I 1.5 feet groups of 3 Phase 2 269 Symphoricarpos snowberry 1 gallon! 4-5 feet in Phase 1 437 . albus 1.5 feet groups of 3 Phase 2 269 I *Bare root plants may be substituted for container plants(except for Douglas fir and Oregon,white oak)•.based upon seasonal j availability and site conditions.Bare-root stock to be 18-24 Inch minimum height, **Plant spacing as required to meet Clean Water Services Design&Construction Standards,(R&O 04-9),March 1,2004. MCA Environmental Consultants Protect 10170-199 V Page 3 1 • • 1---362 16---522 • G� �I i=l k `'\,,�,'- ,,, .,•, • 100 Y �r // \\ i\',,< < 100 YPear . / i r 2--1,083 17--1.654 ��4t �(1 �',�Y 1 •,�\� �' =� t fIve,Corrldgrv," \ ' 1, ' ,. Flood lain`• , ' 3--5,633 18--3,470 �... .., ` Ni\i Flood Iq1 3 �\ \�� 9,4 '� I i / ( 4-10,805 19--1,948 �� f Enhancement)(Phase t) :**I...1.1.1.1.1 2$,rLt�l \\ \`\ v 1 t i i t ,R/Wr •- ; ,' '-_ 5=--840 20---467 r'fY n , % i/ % / ,` \ \� \:\ • i !i ling, i r : if In1'Paot (Phase 1) ♦ \ t t i�%'" 6---345 21- 355 36- i i • 1$si449, /i/ ;i ` `_-_.-- �� .3 ` „N,,,,, N,N:�rj to ,mow... /%1 l "7--1,188 22---473 n. / To f D k, \��� •` _ •ng ' ,\ - l rlMltfaotlon(Pha§s-1)' ,'1>;1z9 Farprn� r ,� �� �`. _' _' .//��ri // t1' r"' J'r•8---452 23---946 I i - r, r('ee �� `� \.\\` Prsi^, ��'� _�' ill ` P 4jtl ._ . ` �. sir /%ar /�i� ,"/} "s 9--7,549 24---927 =��' : er ICt'�Yeact (Phase 2) M1 + r A-...-22,30 ,4,iyi r ! ,.< \ iyrr �, i•/go ' / /r y: • 10--3 808 2$----60 1 r-.., i r "P y At�, / �/ //�j/ j/�, r r r / ryit Gr CI • `\ \ /• ///li , /�y� �8 �,,,A . , . 011 � � / 1_ tlrr°11t 9 \ i�'H �4%�� � /E ?., *-, 11--1.851 26--2.7$7 • =NP,f�r;Mlt�g¢tlon(Phase 2) �.. 2 305 + 1 j , _ . ,,„.4.. /�r/g„,„ "' - 12--5,388 27--2,552.�{!�°� IA�x j '.. i i 1 i 1l �� { 1 if�i`« �\' - /r1 ./r3 1 1 iBN(fel; ?han hose 2') i 6,025 I" P% .4ra,, ��1, - \�..--��J%t'/; 's'; 4„,c � ft,// _'." 1, I i 137-4,295 28---639 wJ���A J 1 J nY� I t ■ % x:/4,4, +'',rr e-11P. 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I ' 1 1, /', _../ i ■ p•..•��• "'eAa, i� I I• r�, {]//G yl I/'r� n,t ,,/,,,,,,,‘, ,, 1, a 1\ 'r. 1 �.: ,` M1 I ..":yi' ,-∎, ,...,1'r \�a, rr``V'\r.r1 \, L Ir/ 'I l IIr/ ;I r 11',�''� .r _ : /, 6 i__ �.� '�`1'+n ', , 'f I�r • `��i1:,i :' ` 1\ \ f iI '• PLAN 1 i , ::::,'-•C:•..S:r;;:^ ' �G1 � `'`iCII,1,,,,__-„,;=‘,., rs -r / 1' , j1'�r i r r/+ ' r '\ r 1 n ' . I !IL r, 's Iba' - r '. r , I 1 l t izj'E' 9..3,'' +l/ /,/r , , i / c�Iwn_ae� L�' '•' , ¢r/:-12.----5,-,--t.'y / '` ft-if" , ,•r l >''1 - 3, ~-P- i ir:f r 1 ',1 3 } / r �1l t1l1 r;, .,-, \ 4,1 l -w' r !' _-� a - 7-. , ....4„,,,,,,, �,: , r 1111i1�, I il�, ,_---..-•t �.,� i i I 1 • -"< ' I I' -,r-;T/ -� f= r-•[� . '( l,(. 1 1 11 I ' ' l r 1 \ r i r .1\01Y— , --J r-A -• i~/I�r,'1`Y".Y������''1� ,.. t 111 11 11111 y / I. 1 1 , _ L l «,.1 a',� n „ , r L �j \ 1 ,lll'xr 1 ,, 111 1 1 ! Ir - i'- n�.1;1- I , ,�r3,, 1 b %Il 1r L I,I1rI1'r 1 I l 1 I r r. . r v_. 1 a 11 i R )-C.,1 1111 1, \ Wetland Its 1 ! • 'J.�- f , L + ' I /, \ ' , 1 'y 11,∎! I 1 1 11,1111;- 1 \ , \ , LL_,r •, ,1 1 yJ ---t_\ 11, I - 1,� ,1, , e 110,04 \ \ 1`', \ .; , 1 • -- ----•--"'""Z.\„.c; ..,. \I -.'-, ,..iii -1- r i I t , , i 11,!:\ \, i'xl," ,i 1 HISf e \ "5- \ \ f ' 1111 I /1/r-- : Ir ,. )1 I u. \ r /,\\ Chan el ,r1�, -'__c:�l ti, r 7 J , �, , ,�/',/r(f'✓',,. J l-r-_y\■ `,``\ ��\tr . .:` r'N./ t 1 0 BO 160 • r -'ate` '-!,'-iv f , rl / , / / , r1 1 i' , t,'\\V,,.\\\�.., / t. .• 1 1. 1 _� l 1 -.,:::1`...E.,:..::::::_-_,J,7 L ^/'< , 111 I;t 1 1 1 4� \.,'•�.. •t y \ /...\ 1 r iV'i• Scale: 1"...60'• -i • ; ''•: -1mi ` '�Z-l\ 1 rl\ ▪ `` ;.\ a., t=\ I 1``\ \\‘'. \\\\\\ \ II Ti II \\ l`ro�1 Note: All ',areas are In sq. ft. '�""1 9 of DALE REVISES NO I. .9V exp. f1/J1/03 DL''}HAAS AAAX0-Comm...a'°a"r SHEET �- CESacO SC �j,�CAPANt cilia] . ••....... A WALL STREET- EXTENSION (PH. i8,2). -- _ CRAM Olt W a'ly CNn,RO V fo91t9Kn i'9Rngp„ STREET & UTILITIES IMPROVEMENTS • SCALE:AS VOWS 4,A/NJ DOA' I CITY OF TIGARD VEGETATED CORRIDOR MITIGATION •ISLE LocA -- PROJECT N0.01939,119 DATE SEPTEMBER, 2004 Fit, 02,628,118 ENOWEERWU DEPARTMENT -j • ME MI I I.I I O Mill .111 Received ----- Fiie Number CleanWate-r-sN Services DEC 2 2 MA 192o. I I Our o.ommitment is clear: SWCA Portland Clean Water Services Service Provider Letter Jurisdiction Tigard Date December. 21, 2004 • Map &Tax Lot 2S1020D00100 200 300 Owner City of Tigard (ROW) 90000 &2S1010001200 Contact Vannie Nguyen I Site Address East of Hall blvd, to Wall St Address 13125 SW Hall Blvd. Proposed Activity Phase 1 and 2 of Wall Street Tigard, OR 97223 extension to Hall Phone 503.639:4171 This form and the attached conditions will serve as your Service Provider Letter In accordance with Clean Water Services Design and Construction Standards (R&O 049). IYES NO . YES NO Natural Resources Alternatives Analysis • I Submitted Assessment (NRA) Ej E Required ® C (Section 3.02.6) District Site Visit ® Tier 1 Alternatives Analysis C .___ Date: 5/24/04 y Concur with NRA/or 1%-:KI n Tier.2 Alternatives Analysis N Isubmitted information • SenSitee Area Present n Tier 3 Alternatives Analysis n . n I ' Sensitive Area Present (� Vegetated Corridor `'' Off-Site . I 1 Averaging L_, I Vegetated Corridor . : Vegetated Corridor 11 El Present On-Site Mitigation Required I Width of Vegetated . On-Site Mitigation I .Corridor(feet) 50 See graphic for total amt and ® E location with each phase • Condition of Vegetated Marginal/ I ri El Corridor ., degraded Off-Site Mitigation r Enhancement.Required __ Planting Plan Attached N. C IMitigation/ Encroachment into Enhancement/restoration enhancement to be Vegetated Corridor ® completed with ' (Section 3.02.4) completion date construction of each • phase Type and Square Footage Phase 1: 24,274 Geotechnical Report n Iof Encroachment Phase 2: 18,610 required El Allowed Use IX Conditions Attached (Section 3.02.4) E This Service Provider Letter does NOT eliminate the need to evaluate and protect Iwater quality sensitive areas if they are subsequently discovered on your . , property. , . I Page 1of4 • /J • . • . File Number • • 141.20 R 1 • In order to comply with Clean Water Services (the District) water t protection requirements the project must comply with the following 9 1. . No structures, development,construction activities, gardens, lawns, application of chemicals, uncontained areas of hazardous materials as defined by Oregon Department of Environmental Quality, pet wastes, dumping.of materials of any kind, or other activities shall be permitted within I•the sensitive area which may negatively impact water quality, except those allowed by Section 3.02.3. 2., No structures, development,construction activities, gardens, lawns, application of chemicals, ' I uncontained areas of hazardous materials as defined by Oregon Department.of Environmental _ Quality, pet wastes, dumping of materials of any kind, or other activities shall be permitted•within • the vegetated corridor which may negatively impact water quality, except those allowed by • i • Section 3.02.4. • 3. Prior to any site clearing, grading or construction the vegetated corrldor.and water quality sensitive areas shall be surveyed, staked, and temporarily fenced per approved plan. During I • • construction the vegetated corridor shall remain fenced and undisturbed except as allowed by . Section 3.02.5 and per approved plans. See attached graphics. 4. Prior to any activity within the sensitive area,the applicant shall gain authorization for.the I project from the Oregon Division of State Lands (DSL) and US Army Corps of Engineers (USACE). The applicant shall provide the District'with coples.of all DSL and USACE project authorization permits. I. 5. An.,approved Oregon Department of Forestry Notification is required for one or more trees • harvested for sale, trade, or barter, on any non-federal lands within the State of Oregon. . , • ,,• , 6. Appropriate Best M ' Management Practices (BMP's)for Erosion Control,In accordance with the I CWS Erosion Control Technical Guidance.Manual shall be used prior to, during, and following earth disturbing activities.. A DEQ 1200C permit may be required for this project if total disturbed• ' area Is over 1 acre for either phase. • . 7. Prior to construction, a Stormwater Connection Permit from the District or its designee is required •pursuant to'Ordinance 27, Section 4.B. I. 8. The District or Cfty/County'may require an easement over the vegetated corridor conveying storm, surface water management,and/or sanitary sewerrights to the District or City that would • . I prevent the owner of the:vegetated corridor from activities and uses inconsistent with the purpose .. of the corridor and any easements therein.. . • . 9. Activities located within the 100-year floodplain shall comply with Section 3.13 of R&O 04-9. , t 10. Removal of native, woody vegetation shall be limited to the.greatest extent practicable. • 1 • 1. Removal of invasive non-native species by hand is required in all. rridors rated ve etated co ' "good". Replanting is required in any cleared areas larger than 25 square feet 12. Should final development plans differ significantly from those submitted.for review by the District, I the applicant shall provide updated drawings, and If necessary, obtain a revised Service Provider Letter. • • • • . Page 2 of 4 I 1 File Number kzo; SPECIAL CONDITIONS I 13. The vegetated corridor width for sensitive areas within the project site shall be a minimum of 50 feet wide, as measured horizontally from the delineated boundary of the sensitive area, I 14. For vegetated corridors 50 feet wide or greater, the first 50 feet closest to the sensitive area shall be equal to or better than a"good"corridor condition as defined in Section 3.02.7, Table 3.2. All areas within the right-of-way, and/or that have been disturbed by construction shall be enhanced/restored. I15. ' Clean Water Services shatl be notified 72 hours prior to the start and completion of enhancement/restoration activities. Enhancement/restoration activities shall comply with the guidelines provided in Landscape Requirements (R&0 04-9:Appendix 0). 16. Prior to installation of plant materials,all invasive vegetation within the vegetated corridor shall be removed. During removal of invasive vegetation care.shall be taken to minimize impacts to ' existing native trees and shrub species. Invasive species removal and control methods shall be in compliance.with CWS' "Integrated Vegetation and Animal Management Guide". I 17. • Enhancement/restoration of the vegetated corridor shall be provided in accordance with the attached planting plan and R&O 04-9,Appendix D. . 18. Maintenance.and monitoring requirements shall comply with Section 2.11..2 of R&O 04-9. If at any • time during the warranty period the landscaping falls below the 80%survival level, the Owner shall reinstall all deficient planting at the next appropriate planting opportunity and the two year maintenance period shall begin again from the date of'replanting. . 1 19,. Performance assurances for the vegetated corridor shall comply with Section 2.06.2,Table 2-1 and Section 2.10, Table.2-2. I 20. For any developments,which create multiple parcels or lots intended for separate ownership,the District shall require that the vegetated corridor and the sensitive area be contained In.a separate tract. The tract plat shall include language protecting the vegetated corridor and sensitive areas. . 1 No lots created with this activity. 21. The water quality swale and detention pond shall be planted with District approved native ' ' species,and designed to blend into the natural surroundings. 'Stormwater shall be treated in compliance with R&O 04-9. • CONDITIONS TO BE INCLUDED ON CONSTRUCTION PLANS . 22. Final construction plans shall include landscape plans. Plans shall include in the details a I description of the methods for removal and control of exotic species, location,distribution, condition and size of plantings, existing plants and trees to be preserved, and installation methods•for plant materials. Plantings shall be tagged for dormant season identification.. Tags to ' remain on plant material after planting for monitoring,purposes, 23. A.Maintenance Plan shall be included on final plans including methods, responsible party • contact information,,and dates(minimum two times per year, by June 1 and.September 30). 24. 'Final construction plans shall clearly depict the location and dimensions of the sensitive area and the vegetated corridor(indicating good, marginal, or degraded condition). Sensitive area boundaries shall be marked in the field. . • ' • Page 3 of 4 111 File Number • 11z-661 25. Protection of the vegetated corridors ' 9 idors and associated sensitive areas shall be provided by the installation of permanent fencing and signage between the residential development and the outer limits of the vegetated corridors. Fencing may not be required along the ROW. Fencing details ' . to be included on final construction plans. This Service Provider Letter is not valid unless CWS•approved site plan is attached. • Pibase call (503).681-5157 with any questions. Yq ns, Astrid.Dragoy Environmental Plan Review • Attachments Site plan with impacts and mitigation Site planting areas Plant list CC Stacy Benjamin • • I . . I • • 1 Page 4 of 4 1 • City of Tigard Wall Street Extension Revised Natural Resource Assessment I. December 2004 • TABLE 2. UPLAND BUFFER SEEDING & PLANTING MIX Scientific Name Common Name Type RatelSpacing I Achilles millefoilum common yarrow Seed 2 lbs/acre • IBromus carinatus California brome Seed 15 lbs/acre Elymus glaucus blue wildrye Seed 10 Ibs/acre •. I . . Festuca roemeri Romer's fescue Seed 8 lbs/acre ' • 3 ft centers in shady IPolystichum Propagules area south of wetland munitum sword fern creation area between (50 total) West Pond and Fanno IPointe access I TABLE 3. UPLAND BUFFER TREE&SHRUB PLANTINGS Scientific Name Common Name Size/ Spacing Planting Location Quantity Height (on center) I . Acer macrophyllum . big-leaf maple 2 gallon/ 10 feet West of Fanno Creek 110 . 3 feet East of Fanno Creek. I (Phase 1:areas 35&36) 60 East of Fanno Creek • (Phase 2:area 34) 40 I . Amelanchier Saskatoon 2 gallon/ 4-5 feet 'West of Fanno Creek . 153 •alnifolla servicebeny . . 2 feet ., rMahonia aquifollum tall Oregon 1 gallon! 4-5 feet West of Fanno Creek. 324 grape 6 inches East of Fanno Creek . I (Phase 2:area 34) 90 1 Holodiscus discolor oceanspray 1 gallon/ 4-5 feet West of Fanno Creek 300 1.5 feet East of Fanno.Creek (Phase 2:area 34) 90 Oemleria Indian plum 1 gallon/ 4-5 feet West of Fanno Creek 140 . Icerasiformis 1.5 feet East of Fanno Creek • i (Phase 1:areas 35&36) ., 100 I . IFishman/SWCA Project 0307118340-199 Page 4 I r.' City of Tigard Wall Street Extension I Revised Natural Resource Assessment December 2004 1 TABLE 3, UPLAND BUFFER TREE&SHRUB PLANTINGS Scientific Name Common Name Size/ Spacing Planting Location Quantity I Height (on center) . Pseudotsuga Douglas fir 2 gallon/ 10 feet West of Fanno Creek 110 • menz/esii 3 feet East of Fanno Creek (Phase 1:areas 36&36) 60 East of Fanno Creek I (Phase 2:area 34) 40 Quercus ganyana Oregon white 2 gallon/ 10 feet . West of Fanno Creek . . 45 1 oak 2 feet East of Fanno Creek • (Phase 2:.area 34) 25 • Rhamnus . • Cascara 2 gallon/ 10 feet West of Fanno Creek 75 I purshiana ` 2 feet East of Fanno Creek (Phase 1:.areas 35&36) 40 .I '1I East of.Fanno Creek ` • (Phase 2:area 34) 35 1 Ribes sanguineum red flowering 1 gallon/ 4-5 feet in West of Fanno Creek • 174 currant 1.5 feet groups of 3 i Rosa..woodsli . woods rose 1 gallon/ 4-5 feet in West of Fanno Creek 300 ' i 1.5 feet groups of 3 East of Fanno Creek (Phase 1 areas 35&36) 100 I Symphoricarpos . snowberry 1 gallon/ . 4-5 feet in West of Fanno Creek . 300 albus' 1.5 feet groups of 3 East.of Fenno.Creek . , (Piiase 1:areas 35&36) 1.00 East of Fanno Creek t (Phase 2: area 34) 90 Ii • I I Fishman/SWCA Project 03071/8340.199 . Page 5 IINIIIIIIIIIIIRIMIMIIIIOIIIIIIIIIIIIIIIIIIOIIIIIIIIIIIIIII NM �■it MI s 1---362 16---315 1GE Ir i f', \ - --„--' Ii ! 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I>I 1 -mss ::•.::• r,l: ,:l - fi:1°e5)L ;,:?}e .uN r L I it V / ItB" .r .;,., :ci€i°'F./ A � " 1 I •••f-•.fi c l- ow v• � I l I .r •1 t:l •::c I , .r / I 1 i•°. a I I Q :l 1 Ir. - — T : � f , L •1 lifiliiiiiiiiiiiiiiiiiiiiiiii♦ r°::-:e:r:l � \ _G�I/ -z,/��� - ■ /sG Fes=%r-' '�w I"/ ;rt. l// rye:r / _ -�1 1,�- - -- l' - F5l''Vic,. ` �:;�-:��.r/ \ •F ll. ' r \ •1 l i . /�,�y ice.r .•/ mac \ IT ;.:c:3=ce:t ..t r 4/ -mac•-./ . \ _r err°°•:':• f 1 \ \ I.t \u•- t ' \ Y1 \ ii �` 1 / •r $ a / - v o � (.� fi / _ 1 J X � \ ... Y - 0 t \ 1 \• I •r•• I I Y / 1 \ 21 1 I \ I \ 1 1 I ��>y \ v \ v / t Y O. \ •r. \ /� l 1 / \ I I / _ 'l t I - _1_ l 1 / I 1 / I I I \ I �' .E3tAl •'•\" ••'y,�'., •,yam -_,Il, // G/ \ATV /\/.\ t / I` '4/ /�/ 1111 lllt. / _ �i- .. Ya. -..1 ` 1\ .�� �. �.> - FrgEM F a I /I r �y e• 7„..r... •� , I'171 L.i / I/1l/ / /////e/// , / ) f •��' / l`� Buffer • - SCHEDULE O ■_, wa REVISION. • _ • ra r/tU AA8 0••xa.. mio� _ .. • SHEET DEH HEE B. WALL STREET EXTENSION (PH. 18,2) en T4 .a rave ruin M . Dsrwls„ W c4 ;„ d ssociBtes, Inc. A STREET 8 UTILITIE . aim Dv: rm ts.__.._6t�NNN,ea.gw, ;a,'”"='1'( S I M PR O V EMEN T S ' wm- >a-nt-M7. twisaet-240 ..r__LJ • ramie 3 scum es stow: 4."....f• are OF TIGARD - UPL4NO BUFFER PLANTING(TABLE 613 Or ^^•°^' Ro[n Na orwv.tu o� AlARC/1, 200•! nC .07.629.1/8 nCITTEEmND DEPARTMENT 3- 1 Ex # isir 7 24(34`F AosT &PORT I : ' 4 T H E P A C I F I C R E S O U R C E S : G R O U P ILAND MANAGERS • URBAN FORESTERS . NATURAL RESOURCE CONSULTANTS IJuly 15, 2004 U . Mr. Marlin DeHaas, P.E. • DeHaas &Associates, Inc. U A.G.C. Center 9450 SW Commerce Circle, Suite 300 • Wilsonville,Oregon 97070 UReference: City of Tigard,Wall Street Extension,revised tree and landscape assessment Dear Mr. DeHaas, I At your request,I have visited the Wall Street site adjacent to the new Tigard Library to review the condition of the trees shown on the survey. The adjacent parcel contains the new Library I and associated parking which is under construction. The majority of the site is undeveloped, alluvial in character, with open fields broken up by groves of trees growing along Fanno Creek and other drainage ways. The site is relatively flat and it is apparent that water has been a.major . influence on the topography and tree species.A significant portion of the site contains trees adapted to frequent inundation or moist soil conditions.The site also contains three aggressive invasive species, Purple Loosestrife, Reed Canary Grass and Himalayan Blackberry, which predominate. The proposed improvements include a street,associated utilities and drainage I improvements. I was asked to examine the 51 trees shown within the project boundary shown op the attached sheet titled,Tree Removal Plan,PH. 1,Street& Utilities Improvements. I found three trees, numbers 41,42 &51, that were not on the original survey.These were added to the attached chart. I also found that several Of the trees listed are actually the stems of Ithe same tree. In total,I assessed 45 trees which are shown on the accompanying chart. . There are many more trees growing on the perimeter of this site, which includes the new 1 Library and the multi-family housing to the south. Some of these trees have previously been examined and assessed in reports prepared by Matt Stine,City of Tigard,Walt Knapp, Arboricultural Consultant and myself. This review is intended as a new look at the trees in. question. Since the majority-of the trees that remain on site are distant from and are unlikely to U be effected by the proposed construction,I limited my review to those that appear to be, relatively close to either the proposed street, walks,utilities, drainage,landscape improvements or grading, The 45 trees included meet this criteria. Of the 45 trees, 28 are 12" in diameter or I larger. An assessment of these trees is included in the chart that accompanies this report. I am recommending the removal of 18 of the'larger trees as they are either in the way of construction, potential hazards or poor specimens with uncorrectable defects. In the course of the tree assessment,I identified 6 trees which can be classified as dead, dying or potentially U hazardous and are unsafe to leave standing.The hazard trees,show in bold typeface on the . s. attached chart, include numbers 14, 17, 31, 33, 39 &53. Of the hazard trees 5 are 12" or larger in diameter and one is under 12". I also identified 5 trees that are in poor condition,with defects that cannot be repaired and which would not be considered suitable for preservation in a more urban.development. These trees,numbers 5,7,20, 26 &50, are shown in italic typeface ' 1331 SW BROADWAY SUITE 100 PORTLAND,OREGON 97201 (503)222-4320 DEI.LEVUE.WASHINGTON (925)451-0620 1 , - . on the attached chart.These 11 trees should not included in the calculation for mitigation that the City requires. Please note that there is the possibility that tree number 50 may be retained if grading nearby is not too severe,it can be left standing in a safe condition and it has an improved chance of survival.A determination on this tree will be made when excavation and I grading is underway. The plan proposes to make an effort to preserve 14 of the 45 trees assessed. These include trees 18, 19, 28, 29, 30, 32, 44, 45, 48, 49, 50, 51, 52 &54. Of these, 10 are 12" in diameter or larger. While it is hoped that these trees can be preserved,it will not be clear whether they can be retained until grading and excavation are underway.Grading is planned near and within the dripline. Depending on the extent of grading,some root loss will occur. When the extent of ' root loss can be observed,a determination can be made as to whether the tree is safe to leave standing or if it will survive. Several Willow trees have main stems that are growing along the - I ground with many upright stems that form a thicket. These trees are wide spreading and their branching habit will preclude grading within the dripline. While not particularly desirable from an ornamental perspective, these trees do function well in a natural planting areas such as a wetland. I suggest identifying these trees prior to construction and if possible,modifying the planned grading to minimize damage to them. I The remaining 9 trees, 12" in diameter and larger,will have to be removed to construct the proposed improvements. If all 10 trees mentioned above can be retained, they would constitute 53% of the larger trees that I assessed, The trees scheduled for removal account for 170 diameter inches which will be factored into the City's mitigation requirements. I also reviewed the proposed tree planting for riparian, wetland and upland areas and it appears that the number of trees to be planted significantly exceeds the mitigation requirements: As mentioned earlier this site is infested with highly competitive invasive weed species that could jeopardize the success of efforts to replant the wetland and upland areas with more desirable native species.There are numerous examples of mitigation wetland projects whose plantings have been overrun by Purple Loosestrife, Reed Canary Grass and Himalayan Blackberry. These plants reproduce by both seed and root rhizomes. I would recommend that the area'be mowed down, treated with herbicide and that the top layer of soil containing roots be removed from the site.This will reduce,but not eliminate these plants. During and following replanting it will be necessary to have a regular maintenance program to suppress the recolonization of the site by these and other weed species. ' On the part of the site containing the assessed trees,it appears that construction activities may or may not come close enough to the remaining trees to warrant the installation of tree protection.fencing. However,should construction activities intrude into the tree/root protection zone of any tree planned for retention, I would recommend installation of tree protection fencing of some sort. I would define the tree/root protection zone for any tree as a circular area with the tree at its center that has.a radius equal to 1'for each inch of trunk diameter, measured at 4.5'above the ground.The trees on this site have grown accustomed to seasonal inundation and high soil moisture.They still require adequate soil aeration to survive during the dry periods of the year. For this reason it would be highly desirable to minimize any soil compaction that might occur within the tree's root zone. This will require keeping construction materials,soil,foot traffic and equipment off the area within the tree/root protection zone to the extent practical. One caution that should be mentioned is the possibility of wind throw or toppling when trees are removed from groups or stands and previously protected trees are exposed to wind. Since this site has a seasonally high water table, the trees are very likely more shallow rooted than tree on dryer sites. Trees growing in dense stands, as is the case in some areas of this site, I may not develop good support roots. When trees are removed and a stand is opened up, the Well Street Arborlcuitural Tree Assessment&Recommendations,7/15/04,102004 The Pacific Resources Group 2 remaining trees lose the protection of those removed and may ay not be able to withstand the wind storms that they will be exposed to. It is not possible to accurately predict the stability of the trees in such stands, therefore,I strongly recommend that any trees that are preserved be monitored for at least the first 2 to 3 years. I One of the questions that is often raised when trying to leave a site in a fairly natural condition such as this,is the wisdom of leaving snags to serve as wildlife trees. There are several of the trees identified as potential hazards,including trees 31 and 53, that could be topped at about 20'and left as snags if the risk of their failure is acceptable to the City. If the development is I designed in such a way that the public is not invited either onto the site or in close proximity to the snags the risk of personal injury is reduced. Should trees be topped and left as snags rather than removed,it would be prudent to regularly monitor the condition of the snags as they deteriorate over time. I . Any trees that are retained.will benefit greatly from a fertilization program that will help promote root growth following.construction.For the newly planted trees the fertilization can be I delayed until the next growing season.To accomplish this I recommend that the landscape maintenance contractor fertilize the entire area beneath the preserved trees and new plantings using a highly soluble high nitrogen fertilizer applied at a time when surface vegetation is • dormant and tree roots are still growing. The best time to do this is in late October or early I . November and again in mid to late February.The fertilizer is best applied just prior to or during a rain, otherwise it should be watered into the soil. I recommend using Ammonium Sulfate (21-0-0 or 23-0-0) at a rate of 2 lbs. of Nitrogen per 1000 square feet of area treated. This I equates to applying 9 lbs. of the fertilizer to each 1000 square feet of area within the drip line of each tree or woody plant. The annual amount of Nitrogen that should be applied is 4 lbs. per 1000 square feet the first year and half that amount in subsequent years.If a single application is made,it should be done in late February,otherwise two applications of 2 lbs. of nitrogen' each can be made in late fall and early spring. (All the other trees, both existing or newly planted would greatly benefit from an application of fertilizer.)The fertilizer can be applied to . the surface of the ground with a cyclone or "whiny" type spreader. The fertilization should be I . done within the dripline and to an area a few feet outside the dripline. To determine the area to be treated for trees such as this, the area to be treated is within the circle, with the tree at its center,that has a radius equal to one foot for every inch of the tree's diameter. After the first application I recommend that you determine the composition of the fertilizer or other soil I amendments that are needed by the plants on site. This can be done by having soil samples analyzed for existing nutrient levels. Contact A&L Western Agricultural Lab at 503-968-9225 for soil analysis assistance. . IThis completes my report.If any additional information,which would effect my observations or recommendations becomes available I would welcome the opportunity to consider it and revise this report accordingly.If I omitted any information or if you have any questions please Ido not hesitate to contact me. Sincerely yours, I ,,d, e, ----°— ' I Stephen F. Goetz,Principal American Society of Consulting Arborists,Reg#260 American Society of Landscape Architects,Oregon Lic.#80 . Society of American Foresters ISG:mac Enclosure . • Well Street Arboriculture]Tree Assessment&RecortunendaUons,7115104,®2004 The Pectic Resources Group 3 I WALL STREET EXTENSION TREE ASSESSMENT I 1 Tree :Dbh Species Cond. Comments No. Inches 1 15" Hawthorn NO No tree found,previously removed for • I TREE construction 2 24" Black Locust NO No tree found, previously removed for TREE construction 3 10" Common Hawthorn Fair Poor structure, partially correct problems with I pruning,marginal for preservation 4 7 12" Common Hawthorn Fair Poor structure,partially correct problems with pruning,marginal for preservation I 5 18" Pacific Willow Poor Poor form, one stern broken down to ground, remaining stem broken top&off balance. Do not preserve I 6 8, 6, Russian Olive Fair Thin crown,lots of fine deadwood,poor annual 6" twig growth 7 12, European White Poor 2 sterns at 4', very thin crown, growing out of 11" Birch bank, lots of deadwood, dying tree, do not preserve 8 31" Deodar Cedar Good Has some structural problems,correct with � pruning it 9 32" ' Deodar Cedar Fair Multiple tops at 45',moderate amount of dead wood in lower crown ■ 10 10" Black Locust Fair Partial crown 11 10" Black Locust Fair Large tall thin wound 3'long on south side 2'off • ground,callusing over, but may have internal decay 12 9" Black Locust Fair I' 13 11, 6" Black Locust Fair Stems have poor connection at base,, remove 1 smaller stem ` 14 10" Black Locust Hazard Leaning against tree 13, Hazard Remove I 15 26" Black Locust Fair/ Declining health,large amount of fine dead wood Poor in crown,check for possible decay at stem union ' 16 15" Black Locust NO NO TREE FOUND TREE 17 15" Black Locust Hazard Dead tree, Hazard Remove 18 -10" Western Red Cedar Fair Thin crown,failing health,suspect saturated soil 19 14" r Douglas Fir - Fair Thin crown, poor twig growth,fine dead wood throughout crown,failing health, suspect. I saturated soil 20 24" . Corkscrew Willow Poor Severely declining health,poor structure, lots of . dead wood,possible internal decay, Do Not ' ' I' Preserve i 21 12, 12, Common Hawthorn Fair Several wounds on different stems, defects and ' 10, 8, dead wood can be removed with pruning ' 7, 6" ' 22 Part of tree 21 i 23 Part of tree 21 I24 Part of tree 21 �1Wall Street Extension Tree Assessment,7/12/04,®2004 The Pacific Resources Group 1 i WALL STREET EXTENSION TREE AS.b'ESSMENT Tree Dbh + Species Cond. Comments No. Inches 1 25 Part of tree 21 26 12" Oregon Ash Poor Poor structure,poor growth,poor health, - unlikely to survive changesfrom development I 27 12" Red Alder Fair Below average specimen,unlikely to survive grade changes from development 28 12" Crabapple Fair Thin crown,moderate amount of deadwood, decay in several stems,growing out of creek bank I 29 15" -Sitka Willow Fair Thin crown,moderate amount of deadwood, decay in several stems,growing out of creek bank 30 20" Oregon Ash Good Small amount of fine to medium dead wood in I crown, growing out of creek bank 31 12" Bgleaf Maple Poor Dying from top down, small leaves, crown 3/4 dead, Possible Hazard, Do Not. Preserve 1 32 12" ' Oregon Ash Fair 'Minor defects,growing out of creek bank, • 33 12" Red Alder ' Dead Dead Snag, Hazard, Remove I34�8" Oregon Ash Fair Partial crown 35 . 12, 8" Oregon Ash Fair Partial crown I 36 Part of tree 35 37 18" Oregon Ash Fair Partial crown 38 15" Oregon Ash Fair Leans to north, partial &thin crown 39 16, Pacific Willow Poor Decay in both stems, fungal fruiting 14" bodies on smaller stem, top broken out I of larger stem, ,Potential Hazard, Do Not Preserve 40 Part of tree 39 I 41 8, 6" Common Hawthorn Fair Has some structural problems which can be repaired by pruning 42 9, 8, Common Hawthorn Fair Has some structural problems which can be 3, 3, repaired by pruning I 3,, 43 15" Pine NO No tree found,probably removed to construct - TREE , apartments I 44 19" European White Fair Tree is.part of landscaped area for adjacent Birch apartments 45 10" Black Locust Fair I46 10" Black Locust Fair . Wound on south side of trunk 47 10" Black Locust Fair I 48 16,11, Pacific Willow Fair Low branched 11,10, 10" _ 49 14" Red Alder Good • '. 50 13,11" Pacific Willow Poor Main stem broken and fallen over at 5,Remove broken stem &decayed limbs e Son Tree Assessment 7/12/04 02004'rite Poc(nc Resources Group 2 Wa11 Street I?xt Extension I . WALL STREET EXTENSION TREE ASSESSMENT Tree ' Dhh Species Cond. Comments I No. •.Inches . 51 10" Pacific Willow Fair 1 52 9,7,6, Pacific Willow. Fair Poor form,main stems close to ground will not 6,5,4" allow grading within dripline 53 28, Oregon Ash Hazard Main stem hollow & girdled by beaver 12." both stems have extensive internal decay. Remove 54 24" Red Alder Fair Growing at angle from creek bank,top previously • broken out and regrown,next to main beaver access to creek NOTE: Trees that are dead, dying or potential hazards and recommended for removal are indicated in Bold , Trees recommended for removal due to poor condition or that are unlikely t o survive changes due to construction are indicated in Italics I i 1 I, i • • • » 1 Wall Street Extension Tree Assessment,7/12104,02004 The Pacific Resources Croup 3 WALL STREET EXTENSION TREE ASSESSMENT ,Less than 12" 1.2" or greater ♦ 1211 or greater ,,,i„.,. T2” or greater 1 N.,,,,,JJ (save) .4,dead or. hazard _ Tree Dbh Species. and. remove • Comments • No. Inches ' 1 . 15" Hawthorn NO No tree found, previously removed for TREE construction , . 2 24" Black Locust • NO No tree found,previously removed for I A TREE construction 3 10" ' Common Hawthorn Fair ' Poor structure, partially correct problems with pruning,marginal for preservation 4 12" Common Hawthorn Fair Poor structure,partially correct problems with . I ( .,':c, pruning,marginal for preservation at i 5 18" Pacific Willow ' Poor Poor form, one stem broken down to ground, ! 4) remaining stem broken top &off balance. Do not I ,preserve 6 8, 6, Russian Olive Fair Thin crown,lots of fine deadwood, poor annual . 6" twig growth . 7 12, ' European White ' Poor 2 stems at 4;.very thin crown, growing out of I '0. 11 E .Birch bank, lots of deadwood, dying tree, do not _ preserve 0 8 31" Deodar Cedar Good Has some structural problems,correct with pruning ' :', ' 9 32" . Deodar Cedar Fair Multiple tops at 45', moderate amount of dead _ wood in lower crown __ i I A 10 _ 10" Black Locust Fai . Partial.crown A 11 10" Black Locust Fair Large tall thin wound 3' long on south side 2' off . ground,callusing over, but may have internal I, _ decal ; A 12 9" Black Locust Fain A13 . 11, 6" Black Locust . Fair Stems have poor connection at base,remove 111 smaller stem "14 10" Black Locust ' Hazard Leaning against tree 13, Hazard Remove •0 1 26" Black Locust Fair/ Declining health,large amount of tine dead wood Poor in crown,check for possible decay at stem union 16 15" Black Locust NO NO TREE FOUND TREE . ;` 17 15 Black Locust Hazard Dead tree, Hazard Remove 18 10" Western Red Cedar Fair Thin crown,failing health,suspect saturated soil . 19 . 14" Douglas Fir Fair Thin crown, poor twig growth, fine dead wood ' throughout crown,failing health, suspect • • saturated soil 20 24" . Corkscrew Willow Poor Severely declining health,poor structure, lots of I *j�� dead wood,possible internal decay, Do Not _ Preserve 0 21 12, 12, Common Hawthorn ^Fair Several wounds on different stems, defects and _ I • 10, 8, dead wood can be removed with pruning 7, 6' 22 Part of tree 21 23 Part of tree 21 I .. ' 24 Part of tree 21 Wall Street Extension Tree Assessment,7112/04.®2004 The Pacific Resources Group 1 • ll I • WALL ST• ,ET EXTENSION T ' EE ASSESSMENT • A1ess than "12" 2" or greater 2" or greater 12" or •greater I • (save dead or hazard-. . (remove) Tree Dbh Species • Cond. (remove) •Comments No. Inches •i • • .25 Part of tree 21 1 • rA 26 12" Oregon Ash Poor Poor structure,poor growth,poor health, ■i• unlikely to survive changes from development 0 27 12" Red Alder. Fair Below average specimen,unlikely to survive 1 grade changes from development 0 28 12" Crabapple Fair Thin crown, moderate amount of deadwood, decay in several stems,growing out of creek bank ill 8 29 15" Sitka Willow Fair Thin crown,moderate amount of deadwood, ,________, decay in several stems,growing out of creek bank I 30 . 20" Oregon Ash Good Small amount of fine to medium dead wood in _ crown,growing out of creek bank '' • • 31 12" Bigleaf Maple Poor Dying from top down, small leaves, •• crown 3/4 dead, Possible Hazard, Do i �+' H Not Preserve • 32 12" Oregon Ash . Fair Minor defects,growing out of creek bank 3 3 -12" Red Alder Dead Dead Snag, Hazard, Remove • .1 8" Oregon Ash Fair, Partial crown 35 • ' 12, 8" Oregon Ash Fair Partial crown • 36 Part Of tree 35 ' ..37 IS" Oregon Ash . .Fair . Partial crown . • .• ' ;38 15" ' Oregon Ash Fair Leans to north, partial & thin crown I 39 16, Pacific Willow Poor Decay in both stems, fungal fruiting 0. 14" . bodies on smaller stem; top broken out, of larger stem, Potential Hazard, Do Not •• i Preserve • • 40 Part of tree 39 • LS, 41 8, 6" Common Hawthorn Fair Has some structural problems which can be A repaired by pruning • A 42 9, 8, Common'Hawthorn Fair Has some structural problems which can be • 3, 3, repaired by.pruning I 3" ' ,f 43 15" Pine NO No tree found,probably removed to construct • -. TREE apartments T ,. 44 19" European White Fair Tree is part of landscaped area far adjacent. ' Birch apartments 45 10" Black Locust Fair 46 10" Black Locust Fair . Wound on south side of trunk I 47 10" Black Locust. Fair .. 0 ,48 16,11, Pacific Willow Fair Low branched 11,10, 10" • • 0 49 14" / ' Red Alder Good r Remove I .:.7A 50 13,11 Pacific Willow Poor Main stem broken and fallen over at 5',Remo e 4,, broken stem & decayed limbs Wall Street Extension Tree Assessn,cat,7/12/04,02004 The Pacific Resources Group 2 I ' . . , . . . . . • . r . . . A . WALL StI5T EXTENSION T . EE ASSOPSIVIE T. 8 ::e • 1... ,•-..10do than'12" : i2" or: gre'ater ' . 1V or groator 12" _ cl,o'iad or tutzard I •• ± •,...•,,,,, ±', ,; ': , ,•(save( . ..; . . ''.kr0.0''''..1th : Species ' No. '1,11' I.cs . , . . $1. !,!.. 1(r!.± - Pacific Willow " .Fti ., ;; •,. . . • . , " 44 I . 4. 02. .: P..74;: Nellie WillOw' ' . liair'; .'•:,: PoOk fOrm,,inala:;teiha close '6 groutiv not .'.: 1 i .6 5 ,h W01112'41'lino (2).* $3. !.; , ..: . :, Oregon.Ash •; .• .. :ait,Ord Main 's •rn o joi•:': olrqie• y boyer . • I 1 " , .. .. . , . - loth Olen's have eixtensive internid decay. • . • :________,:' ItentO;Vo i' ,': : ,• _. _ : • Ô .1! : ±. , 4.:;. i. ;: Red ± der : , au':: .: OtOWing at an.Eldiroto cteek banlc, toji ti'rcilcy. . : • :i broken oilegnd,fqroWn,next Co main beaver • I . W ,A , :: . . ii • , .:, access 40 cie4y, . • . , . • , • . , . • • ± . • • • • , , . • ± . . ' I NOM. • 11 , . ... • • • , , II trees that are dead s dying or p otential:hainOS„and recommended'for I • ±. • :reinoval fire Indicated in, Bold • • • • I • - ±7)1e4.7 recommended for retrioval due to poor pondition,or that are unlikely to survive PilOges'dite to co'n,struction are indleated in Italics . ! II , . . . . , '• • . IN. Total nutaber Of trees 4.12" dbb ... 16 1 P)• total rarber of baOrri/poor condition trees '• 12" =• £0 , I I , .. : . ,.!• Total number of trees 712" dbh to be retrioved 9 Total number Of treeo,;*12" dbh op 15 f .sEWed „,,, . 9 • . • 1 I, i. :2) . .. . ' • . , . . , • . . . . , I . ' .• ' • ' • . . • ' , . : •r• . . . I . . • . • . . . I, . . . . , • • • . - , . „ • . • , . • . • • ' . . . , .. • • . , . • . . ' I . . . • . . ,. ' , .• ,. g . • . . • ' : .. , ,, , .'' ' , . . . . . . . .. . . . .. . , - .: i .' , , • - , . • , ' . . - : . I • • , ... 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Z I , i ir?:Err eitip;:. •, 11:{11 /\ L /\ \ \ / \ \ a / 'l1 ��• ° rl: rtti r• t. ;:Fr v 1 I I't / . ,� , �\ �r\rr}li' c - i'ogli j{:jjik a L- /T / /,01,• `� 'f ,S \v�it 1V/\ I "/`I / ' \\Il i I III /, - �, ;r \ \''i • iit ti!r! -d- s / \ l /I I I/ / / --,-d,, / rl //,ff'''(' pr \(/),4,,,A,/\ ),,,i_\ / I /1 r (-,,,,ii,/,),,,,/1 \I II /' r, ,, , I \ `� ' .- r-r-/ -1)I 10•,1-<�� / I i I fr ,/ r 1 i� 1 • I Buffer ••\ J \ i / • . ' SCHEDULE O. O.re _,sox NO. FIT Pp. ,z,r,/oi DE• HAAS a'"so s10pi.-"ow"° o; - SHEET ^� �`°""� � � °°�°��° WALL STREET EXTENSION (PH. 1)' I -.--__ CROW Oh Lx tr�m°�4 Associates,:Inca.• - D° _�_ E'""°`°*'°""- ,..r��2a A , STREET & UTILITIES IMPROVEMENTS 33 • sG,r2.:A'910W 4 ,,,,0/' I CITY.OT TICARD UPLAND OFFER PLANTING (TABLE 41 • OF FILE LOGOLW:Si W0A022_WNE MEET\WKr3T_A11GNJRNgDyA•p PROJECT Na 02.022.110 a� NOV. 2005 „u 02.629.r_le - Exowmaxo°EMMERT 34 MN — — • In MI • • MN • • • MI OM • — N — i • DPANINO PLOTTED AT 1 •HALF THE NOTED SCALE' " V.''.• ! - " Table I.Wetland Planting Mbc Table 3.Wetland Tree And Shrub Plantings" TABLE 4.UPLAND BUFFER TREE&.SHRUB PLANTINGS - Common • Scentifig Name Coeruoun She' Spacing Planting Location Quantity" Selentifie Name Commoci Name Slid Spacing Planting Location Quantity Name.•Name Type Rata/Spacing Location' Quantity (e 0 9 y Name -. Agrodheserafn �e seed 2lbslaae Al 1.8@s Aces&ir vine maple 1ga8an West Pond(149-150ft) 10 �r .2gIBM' 101oel-r) . • bertllyass meaop8ytlun.WV--TM* 2 gallon/ 10 feel" Phase i 181 . &8 feel an canter pedrtreteroi East PoM 10 •- .. . • Sleet Wan Pond 76 (139.1108) . Carer o[axga gapapdes Sod b Eesld WeslPod 100 Comes aklonCera - er l gaol. 5-10 feet on • lap olahaem hank 100 �a Saskabm. t ga0od. 4.5 feel Phase l _ . 300 ' • East Pond 100 pserlreaD ,,, center elntldk savkebert� 2feet •Beaches coda a�m>n seed sadeae N 1.81M Crataegesdagfasg black 1 gallon 10 laden carder West Pang(14&1498) 5 MehWso offo&en tai Oregon. •abed 4-5 feel • Phenol 497 Nontean " hawthorn perimetercEastPond 5 • 9raDO 8 ...:s " yard d . barley seed 12 tlsdaae N • 10.8 M (138-139 N NdodLrous dlncda ocearssprey 1 g:: 4-5 leaf Phase t 300 . slender N Raskin:loidla. Oregon ash 2.- • 15 feet on center West Pond(147.1488) 20 1.5 feel • Arsaa daub , rash seed 1 Nano - 0.9 a>s' \ • East Pad 8 wetland 30 Oemlerto Indian plum 1 galbN 4- Phase 1 300 WIYPBYdas seed Sibs/acre Al 7.2 bar 137/ter11po18y caresWrtnls I 1.6 feet � _ kpbo l� wetland disturbance area m Douglas 6r' 2 gallon/ 10 feet Phase 1 ' 181• •SYe amet• 1 fl aide s b vast d West Pad 100 -- P aapus capraWs P 1 g 5-8"•Ion center West Pond(148 6) 10 • 3 feet nrkrxerpus PWa9"bs youpsd 5 West Pond 75 nine perbnoter of East Pond 8 Onerous garryena Oregon white 2 gallon/ 10 feet Ph"••1 60 •_ EastPoad. 100 .6 tl...,1on (1380) ." 21ee1 ` "1Yetbnd plantigmss b beseeded b etwouand rrdtgaOOn areas end temporary wetland impact moos.Ohsibute Rosepbocaipa wildclustered n/3; •West Pend(148-149 tt) 20 seed ungainly over to designated area and hand rake to Were trot mad Is firmly In canted wlh the sot.Slough Rhamaa cascara ileot 10 feet Phasel �• S0 I sedge and sma86dled dealt tube planted b central depressbn areas b wdane terraces In bo created oast and rose 3 on center perimeter 33ol East Pond 15 prashfata •- ' • 21ed JC'-� • • ,west d he West Pond end b recodgurod 1. PC,d and East Pad. ` • of "• ( Sala IasTanda Padfic rotor 1 gaol. fee ` d steam bank 50 Popes sag6ra°ned towering 1 gallon/ 45 feel Phase 1 200 I • or stakes -canter carets • 1.6 feet • Salk piped Piper's willow 1 gallon 5-t I on lop of s. bank 70 Rosa • Woods mss 1 gallon/ 4.5 feet b Phase 1 437 I. . or stakes d East Pad wetland 30 1.5 feel groups of3 resloralbn: (136-137 Symplmricarpos srwwberry 1 galood" 4-5 feet In Phase 1 437 l ft)l temporary =Sand aibus 1,5 tea" groups of 3 " disturbance area 'Me root plants maybe substituted ier container plaits(except for Douglas hu and Oregon while oak)based upon seasonal I TABLE 2.UPLAND BUFFER SEEDING&PLANTING MIX. • - Salk scadodana Scouter I gallon 15 feet co ce er Wetland restoration - 30 evatlabEy end die exclaims.Barerod abet to be 18.24 Inch mlnknum height willow Or stakes (137-138 A)I tempera -Plant spacing as required to meet Clean Water Smvlces Design&Ccossucgon Standards.(U0 044),Mach 1,2004. SdentiOe Name Common Name Type • Rate/Spacing' wetland disturbanc0 aroa - Add(ee ndkdoaan coalman yarrow Seed 2 Oxsfaae Thrr)aplicate western red 2 gallon 15 felon center West Pond(149—150 fl) - cedar g39-t409)-East.Pond 5 . Sromusarhafus. .CalfomtaWdre Seed ••15Wslacre (199.140 Q)`.. - Eyrma Mucus blue wildrye . Seed • '10 AMlacie bare root paler may be stubbled for oontalrrer plats gusset for western red cads)based upon seasonal avaachNy and ." _ - - site coalitions.Oae•rod stock to be 18.24 her rnkdmao height Wilms stakes b te e mbksmn 4 trot length • . Fesluce reenterl: . Romer's fescue Seed- 8 lbs/aae •- . 3 8 centoia hr shady " . - ' .. • - PblysOchr n - - Propageles area south olaretland " - - . • munIDarr awed lam• (so a uatlon wee between - ' West Fond and Fenno . -. • • '- Pointe saxes - • SCHEDULE 0 oArz rte s" - tea" err . - a DE HAAS.- - - SHEET .-_ �,,Pr,��r� 6 y �•a,.a "WALL -STREET -EXTENSION •-(PH. "1) M5 . wusxt en a - t1:.,r'\ ssocia�6B; Inc. "clgu'°" "e. `''Wa"ab '°" ,1"!'ljl `'STREET"-8:' UTILITIES IMPROVEMENTS" M )art-too -� ..-:- .,:. :DAIEi.-_ •ter ,� :... - -- rAC /-- - 34 :scum"AS sown " - - .. • .. ... CITY OF•TIGARD • - PLANTING TABLES OF•raE,IACAnoN:Bourse\EYa_wAlC S11EC1�WALL8y�Igr�Rggal,Op PpaECf N0.oua.a se - ah Augriet,."2�5I. 02.629.118'.; cncmcswsto osrAansar .." ' - 34 • I Calculation Sheet Calipe I Ir inches of Actual Tree Replacem ent Table 3.Wetland Tree And Shrub Plantings IScientific Name . Common Size* Spacing Planting Location : .c' Name • o 1 a Acer circinatum vine maple 1 gallon West Pond(149-150 ft) 10 0 (Shrub) 5.8 feet on center perimeter of East Pond 10 0 (139-140 ft) Cornus stolonifera red-osier 1 gallon 5-10 feet on top of stream bank 100 0 I [[sericea)) dogwood center (Shrub) I Crataegus douglasii black 1 gallon 10 feet on center West Pond(148-149 ft) 5 0 hawthorn perimeter of East Pond 5 0 (Shrub) _ (138-139 ft) I Fraxinus latifolia Oregon ash 2 gallon . 15 feet on center West Pond(147-148 ft) 20 10 (Tree) East Pond&wetland 30 15 restoration area.(136- 137ft)/temporary wetland disturbance area t_- Physocarpus capitatus Pacific 1 gallon 5-8 feet on center West Pond.(148 ft) 10 0 ninebark (Shrub) p erimeter.of East Pond 8 0 (138 ft) • I Rosa pisocarpa wild clustered 1 gallon groups of 3; West Pond(148.149 ft) 20 0 rose (Shrub) 3 feet on center perimeter of East Pond 15 0 _ (138-139 ft) I Salix lasiandra Pacific willow 1 gallon 10-15 feet on top of stream bank 50 0 (Shrub) or stakes center Salix piper! Piper's willow 1 gallon 5-10 feet on top of stream bank 70 35 (Tree) or stakes center East Pond&wetland 30 15 restoration area(136-137 I /temporary wetland disturbance area Salix scoulerfana Scouler 1 gallon 15 feet on center Wetland restoration area. 30 15 I willow (Shrub) or stakes (137-138 ft)./temporary wetland disturbance area Thuja plicate western red 2 gallon 15 feet on center West Pond(149–150 ft) 5 2.5 I cedar(Tree) perimeter of East Pond 5 2.5 •• (139-140 ft) *Bare root plants may be substituted for container plants(except for western red cedar)based upon seasonal availability and site conditions.Bare-root stock to be 18-24 inch minimum height.Willow stakes to be a minimum 4 foot length. Note: 1/2 caliper inch is allowed for both 1 and 2 gallon sizes. No credit is allowed for shrubs. I I I Calculation Sheet • ICaliper Inches of Actual Tree Replacement TABLE 4. UPLAND BUFFER TREE&SHRUB PLANTINGS IScientific Name Common Name Size/ Spacing Planting Quantity Cal,in Height (on center) Location allowed I Acer macrophyllum big-leaf maple 2 gallon/ 10 feet Phase 1 181 90.5 (Tree) 3 feet Amelanchier Saskatoon 1 gallon/ 4-5 feet Phase 1 300 0 alnifolia serviceberty 2 feet (Shrub) ' Mahonia aquifolium tall Oregon 1 gallon/ 4-5 feet Phase 1 .437 0 grape (Shrub) 6 inches 1 Holodiscus discolor Oceanspray 1 gallon/ 4-5 feet • Phase 1 300 0 (Shrub) 1.5 feet Oemleria Indian plum 1 gallon/ 4-5 feet Phase 1 300 0 I cerasiformis (Shrub) 1.5 feet Pseudotsuga Douglas fir 2 gallon/ 10 feet Phase 1 181 90.5 menziesii I (Tree) 3 feet Quercus garryana Oregon white 2 gallon/ 10 feet Phase 1 60 . 30 oak (Tree) 2 feet Rhamnus Cascara 2 gallon/ 10 feet Phase 1 . 60 30 purshiana (Tree) 2 feet I .. Ribes sanguineum red flowering 1 gallon/ 4-5 feet Phase 1 200 0 currant 1.5 feet (Shrub) IRosa woodsli Woods rose 1 gallon/ 4-5 feet in Phase 1 437 0 . (Shrub) 1.5 feet groups of 3 1 Symphoricarpos Snowberry 1 gallon/ 4-5 feet In Phase 1 0 albus (Shrub) 1.5 feet groups of 3 *Bare root plants may be substitutedior container plants(except for Douglas fir and Oregon white oak)based upon seasonal Iavailability and site conditions.Bare-root stock to be 18-24 Inch minimum height. "Plant spacing as required to meet Clean Water Services Design&Construction Standards,(R&O 04-9),March 1,2004. ITotal caliper inches of actual tree replacement=336 inches I I I 1 11° � £xff? Brr I IL)U6 AoRsr XEr • ' T H E P A C I F I C R E S O U R C E S G R O U P LAND MANAGERS •URBAN FORESTERS •NATURAL RESOURCE CONSULTANTS 1 October 13,2008 t Mr. Rhys Konrad, Planner Group Mackenzie 1515 SE Water Avenue, Suite 100 ' PO Box 14310 Portland,Oregon 972293 Reference:Proposal for Arboricultural Consulting services for Wall Street Extension site in Tigard,Oregon. Dear Mr. Konrad, ' This report is a supplement to my report of 7/15/04 related to the first phase of the Wall Street and Tigard Public Library development project,a copy of which accompanies this report.As you requested,I visited the site of the Wall Street Extension bridge,located across the creek from the Tigard Public Library.For this report,I assessed the 13 trees shown on the attached tree location diagram. The trees on the diagram are numbered from 60 to 72 and correspond to the accompanying tree assessment chart. Of the 13 trees,4 were either dead or had such serious ' defects that they are too hazardous to leave standing regardless of what kind of development proceeds. An additional 7 trees have poor form,internal decay or other defects that make them poor specimens,unsuitable for retention in an ornamental landscape or potential hazard trees as ' they continue to deteriorate.I recommend that all of these poor specimens should be removed if development proceeds,however,if the area adjacent to the proposed bridge remains undisturbed and undeveloped and if grade changes near the trees are minimal,I may reconsider my ' recommendation to remove them.A final recommendation will have to wait until construction plans are complete and proposed improvements are precisely located on site prior to commencement of construction ' If the elevated portion of the street extension is placed on piers,then it is P ossible that some of the more desirable trees out side of the shaded area may be able to be preserved. Since I do not ' have a plan that shows possible excavation I must reserve judgement as to the probability of retaining those trees outside of the shaded area on the tree location diagram.The exception would be the hazard trees,which I recommend be removed.Given the information I have at the present time I recommend removal of trees 16,26,27,41,42,60,64,65,66,67,68,69,70 and 72.It is also likely that trees 62,63,and 71 will also need to be removed,but as stated previously,this decision can be delayed until project planning is further along and construction details are clear. 1 TREE PROT . TION-Any of the trees that are going to be retained within and near the ' construction area should be protected from inadvertent damage during construction with tree protection fencing.If you wish to attempt to preserve trees near excavations,I recommend that ' 4800 SW MEADOWS RD. SUITE 300 LAKE OSWEGO,OREGON 97035 (503)222.4320 BELLEVUE,WASHINGTON (425)451-0620 you consider exploratory excavation for any improvements within 10'of the trunk.If needed,the exploratory excavation can be done either by hand or by using other equipment to expose any roots that are in or under the proposed improvements.If roots larger than 1.5" in diameter are exposed,I recommend that you contact me to make a determination on preserving or removing the trees involved. ' In addition to protecting the trees from inadvertent physical injury,the tree protection fencin g should serve to minimize any soil compaction that might occur within the trees'root protection ' zone. This will require keeping construction materials,soil,foot traffic and equipment out of the area within the tree protection zone to the extent practical.In cases where excavation must take place within the root protection zone,the tree protection fencing should be installed no closer than 4'to 5' off the base of the tree.It should protect as much of the root protection zone as possible,without including the excavation for the utilities,foundation walls,etc.If it is necessary to work closer to the tree than this or to work inside the tree protection fencing,you should ' notify me.Either chain link or orange plastic construction fencing,staked every 8'to 10',will meet the functional requirement for tree protection,however I suggest checking with the ' appropriate County official as to the current standard. FERTILIZATION-To help the trees being preserved to overcome the adverse effects of ' construction and to help those that will be planted as part of the proposed landscape improvements,I recommend starting an annual fertilization program.Taking soil samples for analysis will indicated the appropriate amounts of nutrients and soil amendments needed for ' optimum growth.Until a soil analysis I can suggest a generic fertilization recommendation. The fertilization program would be applied to all those trees that are retained on the site,particularly for those located within 20'of excavations or grading for any site improvements. The fertilization ' recommended is simple,inexpensive,and can be done with the assistance of a tree service,or landscape maintenance firm or with general field labor.It requires that a highly soluble high nitrogen fertilizer be applied at a time prior to installing the landscape improvements or when ' surface vegetation is dormant and tree roots are still growing. The optimum time for application is during the dormant period in early to mid November or early February.At both times I recommend using Ammonium Sulfate(21-0-0 or 23-0-0)at a rate of 2 lbs.of Nitrogen per 1000 square feet. This equates to applying 9 lbs. of the fertilizer to each 1000 square feet of area within the drip line of each tree. The fertilizer can be applied to the surface of the ground with a cyclone or "whirly"type spreader. The fertilization program should begin within the first year ' following construction and continue annually, for a period of three years.The area to be fertilized is within the drip line and approximately 10'outside the drip line of the trees. EILUIIMQ-Almost all of the trees whose crowns over hang the construction area have dead ' branches in them.These branches vary in size from less than 1/4"to over 3" in diameter.As these dead branches decay their connection to the tree will deteriorate and they will fall. Given that the crowns of some of the trees may overhang the proposed street,the risk of leaving the large dead wood in the trees is unacceptable.I recommend that any trees retained be pruned for hazard reduction and to improve their general health and condition consistent with the ANSI 300 Standard for tree work.Any reputable tree care firm will be familiar with this specification. At the time of pruning the trees should be inspected for defects that were not visible from the ' Wall Street Extension Site,Tree Assessment Report,©2008 Pacific Resources Group.9/27/08 2 ' ground. Any that are found should be reported and correctable defects should be repaired at that time. MONITORING -Inspite of all the best efforts to preserve trees,some may decline in health over time.If any trees are preserved,to protect the investment in tree preservation,I recommend ' some extra effort to assess any changes in their condition over time.Even when frees are in the best of health there is always some unpredictability associated with their presence.Preserving these trees is not without risk,but this risk is reasonable if their care is managed properly.I ' recommend that the trees'health and condition be monitored for several years.Monitoring should include annual inspection to assess the effectiveness of the fertilization program,the tree protection measures, stability and other landscape maintenance practices.If any root cutting ' occurs within the dripline of the trees during construction it would be wise to check the stability of the trees,particularly during high winds. This completes my report.If any additional information,which would effect these recommendations,becomes available I would welcome the opportunity to consider it and revise this report accordingly. If I omitted any information or if you have any questions please do not hesitate to contact me. ' Thank you. Sincerely yours, Stephen F. Goetz,Principal American Society of Consulting Arborists,Reg#260 ' American Society of Landscape Architects,Oregon Lic.#80 Society of American Foresters SG:mac ' Attachments: ARBORIST DISCLOSURE STATEMENT:Arborists are tree specialists who use their education,knowledge training and experience to examine trees,recommend measures to enhance their health and beauty and to attempt to reduce the risk of living near trees.Clients may choose to accept or disregard the recommendations of the arborist or to seek additional advice.Trees and other plant life are living,changing organisms affected by innumerable factors beyond our control.Trees fail in ways and because of conditions we do not fully understand. Arborists cannot detect or anticipate every condition or event that could possibly lead to the structural failure of a tree.Conditions are often hidden within the trees and below ground.Arborists cannot guarantee that a tree will be healthy or safe under all circumstances,for any ' specific period or when a tree or its parts may fail.Further,remedial treatments,as with any treatment or therapy,cannot be guaranteed. Treatment,pruning,bracing and removal of trees may involve considerations beyond the scope of the arborist's skills and usual services such as the boundaries of properties,property ownership,site lines,neighbor disputes and agreements and other issues.Therefore,arborists cannot consider such issues unless complete and accurate information is disclosed in a timely fashion.Then,the arborist can be expected,reasonably, ' to rely upon the completeness and accuracy of the information provided.Trees can be managed but not controlled.To live near trees, regardless of their condition,is to accept some degree of risk.The only way to eliminate all risk associated with trees is to eliminate all trees. HAZARD/HAZARD POTENTIAL.,:For the purposes of this evaluation and/report,a tree or tree part that presents a threat to humans, livestock,vehicles,structures,landscape features or other entity of civilization from uprooting,falling,breaking or growth development(e.g., ' roots).While all large landscape trees in proximity to such targets present some degree of hazard regardless of their condition,such inherent hazard is not intended as within this definition and its usage in this evaluation and report. INSPECTION LIMITATIONS;The inspection of these trees consisted solely of a visual inspection from the ground.While more thorough techniques are available for inspection and evaluation,they were neither requested nor considered necessary or appropriate at this time. Because trees and other plant life are living,changing organisms effected by innumerable factors beyond our control,The Pacific Resources ' Group and it's personnel offer no guarantees,stated or implied,as to tree,plant or general landscape safety,health,condition or improvement, beyond that specifically stated in writing in accepted contracts. ' Wall Street Extension Site,Tree Assessment Report,©2008 Pacific Resources Group.9/27/08 3 WALL STREET TREE ASSESSMENT Tree Diaz. Crown No. Inches Species Ht/Width Health Condition Comments 60 22 Red Alder 0 Dead Dead Toppled over.Dead Moderate&non- Crown off balance,heavy to northwest.Tree sits 6'from edge of undercut creek bank and 61 27 Oregon Ash 75 x 32 Good correctable defects may not be stable. Top broken out and regrown to multiple 3"to 6"sucker tops,suspect internal decay in Major defects or broken top and in main stem. Partial crown is unbalanced. Very Poor Specimen.Do Not 62 18 Big Leaf Maple 40 x 25 Fair problems Preserve. 5, 8, Major defects or Main trunk is splitting from 4'to 21'&is separating.Largest stem is will break of: 63 10.12 Common Hawthorn 35 x 25 Good problems Internal decay inside split.Very Poor Specimen.Do Not Preserve. 2 stems at 4.5',trunk is split to ground,hollow with extensive internal decay in base. 64 37,38 Oregon Ash 80 x 50 Good Hazard Hazard Remove. 2 stems at 2', 7 stems at 6'.Larger stern has extensive internal decay,smaller stem contains 60%of crown volume and leans to the east.Stem covered with.English Ivy and Major defects or is invested&y borers or bark beetles evidenced by large amount of sawdust on Ivy leaves. 65 13, 15 Sitka Willow 30 x 30 Fair problems Moderate amount of dead wood in crown.Poor specimen.Do Not Preserve. 5,6,7, 4 stems at 30",larger stern.has exposed and internal decay from 1.5'to 6',leans to east. 66 13 Sitka Willow 35 x 20 Fair Hazard Hazard Remove Moderate&non- Top broken out and regrown at 55',inspect broken top and regrown sucker connections 67 25 Black Cottonwood 90 x 40 Good correctable defects before considering preservation. Leans at 45",off balance ¬ correctable.Decay in lower part of trunk with open 68 17 Oregon Ash 25 x 25 Poor Hazard wound at base.Hazard Remove Formerly 3 stems at 3'with included bark. One stem has toppled.Remaining stems off balance to south&west. Large wound from stem failure has exposed decay. Very poor callous tissue formation shows poor vigor.Poor specimen &potential hazard if Major defects or remaining stems fail.Invasive examination needed if considering retention.Do Not 69 21,23 Oregon Ash 80 x 40 Fair problems Preserve is recommended. Major defects or 3 stems at ground leaning out from center at 25°to 35°.Very Poor Specimen.Do Not 70 7, 7, 8 Common Hawthorn 30 x 35 Fair problems Preserve. Moderate&non- Several old wounds at base from beaver,possible internal decay.Recent beaver damage. 71 10 Oregon Ash 45 x 25 Good correctable defects Marginal for preservation due to ongoing beaver damage. Moderate&non- Off balance to south&leans to south at 35°which is not correctable,Located 4'from 72 18 Oregon Ash .55 x 35 Fair correctable defects edge of cut bank&is not stable.Poor specimen is marginal for preservation. Notts s Trees that are dead,dying,hazardous,potentially hazardous or have serious defects and are recommended for immediate removal are shown In BOLD. Trees that have significant defects,have been damaged beyond recovery or are such poor specimens that they should not be preserved,are shown in ITALICS. Wall Street Extension Tree Assessment,@2A08 The Pacific Resources Group,9122108 1 I WALL THE T S E EXTENSION TREE ASSESSMENT ITree Dbh Species Cond. Comments No. Inches I 1 15" Hawthorn NO No tree found,previously removed for TREE construction _ 2 24" Black Locust NO No tree found,previously removed for I TREE construction 3 10" Common Hawthorn Fair Poor structure,partially correct problems with pruning,marginal for preservation 4 12" Common Hawthorn Fair Poor structure,partially correct problems with I pruning,marginal for preservation 5 18" Pacific Willow Poor Poor form, one stem broken down to ground, remaining stem broken top&off balance.Do not Ipreserve 6 8, 6, Russian Olive Fair Thin crown,lots of fine deadwood,poor annual 6" twig growth l 7 12, European White 11" Birch Poor 2 stems at 4', very thin crown, growing out of bank, lots of deadwood,dying tree, do not preserve I 8 31" Deodar Cedar r Good Has some structural problems,correct with pruning 9 32" Deodar Cedar Fair Multiple tops at 45',moderate amount of dead I wood in lower crown 10 10" Black Locust Fair Partial crown 11 10" Black Locust Fair Large tall thin wound 3'long on south side 2'off ground,callusing over,but may have internal decay 12 9" Black Locust Fair I 13 11, 6" Black Locust Fair Stems have poor connection at base,remove smaller stem 14 10" Black Locust Hazard Leaning against tree 13, Hazard Remove I15 26" Black Locust Fair/ Declining health,large amount of fine dead wood _ Poor in crown,check for possible decay at stem union 16 15" Black Locust NO NO TREE FOUND I 17 15" Black Locust TREE Dead tree, Hazard Remove I 18 10" Western Red Cedar Fair Thin crown,failing health,suspect saturated soil 19 14" Douglas Fir Fair Thin crown,poor twig growth,fine dead wood throughout crown,failing health,suspect , , saturated soil 20 24" Corkscrew Willow Poor Severely declining health,poor structure, lots of dead wood,possible internal decay,Do Not Preserve I 21 12, 12, Common Hawthorn Fair Several wounds on different stems,defects and 10, 8, dead wood can be removed with pruning 7, 6" I22 Part of tree 21 23 Part of tree 21 I24 Part of tree 21 Wall Street Extension Tree Assessment,7/12/04,02004 The Pacific Resources Group 1 WALL STREET EXTENSION TREE ASSESSMENT ITree Dbh Species Cond. Comments No. Inches I 25 Part of tree 21 26 12" Oregon Ash Poor Poor structure,poor growth,poor health, unlikely to survive changes from development I 27 12" Red Alder Fair Below average specimen,unlikely to survive grade changes from development 28 12" Crabapple Fair Thin crown,moderate amount of deadwood, Idecay in several stems,growing out of creek 29 15" Sitka Willow Fair Thin crown,moderate amount of deadwood, I bank in several stems,growing out of creek 30 20" Oregon Ash Good Small amount of fine to medium dead wood in crown, growing out of creek bank 31 12" Bigleaf Maple Poor Dying from top down, small leaves, crown 3/4 dead, Possible Hazard, Do Not Preserve I32 12" Oregon Ash Fair Minor defects,growing out of creek bank 33 12" Red Alder Dead Dead Snag, Hazard, Remove I 34 8" Oregon Ash Fair Partial crown 35 12, 8" Oregon Ash Fair Partial crown I 36 Part of tree 35 37 18" Oregon Ash Fair Partial crown 38 15" Oregon Ash Fair Leans to north,partial&thin crown I39 16, Pacific Willow Poor Decay in both stems, fungal fruiting 14" bodies on smaller stem, top broken out I of larger stem, Potential Hazard, Do Not Preserve 40 Part of tree 39 I 41 8, 6" Common Hawthorn Fair Has some structural problems which can be repaired by pruning 42 9, 8, Common Hawthorn Fair Has some structural problems which can be I3, 3, repaired by pruning 43 15" Pine NO No tree found,probably removed to construct I , TREE apartments 44 19" European White Fair Tree is part of landscaped area for adjacent Birch apartments 45 10" Black Locust Fair I46 10" Black Locust Fair Wound on south side of trunk 47 10" Black Locust Fair 48 16,11, Pacific Willow Fair Low branched 11,10, 10" I49 14" Red Alder Good IWall Street Extension Tree Assessment,7/12/04,©2004 The Pacific Resources Group 2 WALL STREET EXTENSION TREE ASSESSMENT 50 13,11" Pacific Willow Poor Main stem broken and fallen over at 5',Remove broken stem&decayed limbs ' Tree Dbh Species Cond. Comments No. Inches 51 10" Pacific Willow Fair ' 52 9,7,6, Pacific Willow Fair Poor form,main stems close to ground will not 6,5,4" allow grading within dripline 53 28, Oregon Ash Hazard Main stem hollow & girdled by beaver ' 12" both stems have extensive internal decay. Remove 54 24" Red Alder Fair Growing at angle from creek bank,top ' previously broken out and regrown,next to main beaver access to creek ' NOTE: Trees that are dead, dying or potential hazards and recommended for removal are indicated in Bold ' Trees recommended for removal due to poor condition or that are unlikel y t o survive changes due to construction are indicated in Italics r 1 I I I I I Wall Street Extension Tree Assessment,7/12/04,02004 The Pacific Resources Group 3 11111 =1111MINIIIMMINIIIIIIIIIIMINIONIIIMINIMINNIIMI 1111011111111111111111111 • ..�r.�. . 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I Memorandum to File �'�, l»' Wall Street Improvements - Phase 1 • - lnvestigation regarding "no-rise" criteria IThis memorandum relates to the requirement that Phase 1 construction in the l00-year floodplain will not cause an increase in flood levels during the base flood discharge IDuring a previous study in July of 2003 by our Subconsultant Oregon r gon Bridge Engineering Company (OBEC), related to costs of varying bridge lengths and approval requirements.of FEMA, OBEC retained West I Consultants(West) to prepare a Hydraulic Analysis Report related to the various bridge lengths. West performed extensive modeling of Fanno Creek extending above and below the proposed Wall Street • alignment. IInasmuch as West had the extensive modeling resources available, we retained them to evaluate effect of the proposed Wall Street Phase 1 improvements and to provide certification of ther findings. level I . • The resulting scope of work procedure and findings arc attached. As indicated in the Scope of Work Phase 1 construction earthwork in the floodplain consists of 135 yd3 of fill J and 1,076 yd3 of excavation for a net total of 941 yd3 excavation..-Accordingly, the Phase I construction enhances the floodplain storage function. I As certified by Christopher R. Goodell, P.C., Phase 1 construction as shown on the attached drawings would cause no-no-Eis.e-itricao Creek during a 100-year flood event. ,fir/ . ,/17 w ,,A.7 I Marlin J. De -Ins, P.E., P.L.S, President • Icc: 02.629.118 / Vannie Nguyen- City of Tigard • - Geraldene Moyle -Group Mackenzie I Chris Goodell - West Consultants , Exp. f2/31/05 • X43 0 t;R X02 r 9 * 'r.. �,ete� . OREGON • ,f./ 41'14, ie0' Pc, - R P 4/NJ. 0 • I • • I 0 _ _ _ _ _ =AL. UO-28-2008 09:08A FROM:FIELDS 5032287089 TO:5032281285 P.1 ' l 1i Ck "4. 600 NORTHEAST GRAND AV[NUf ►OAT LAN D, OREGON 87737 7796 TEL 503 797 1700 I FAX 503 797 1797 ' „ ill ,s, I.t ri METRO I • l},I r 3/2/05 i:4i.11 Mr. Fred Fields f.z :N, 1149 SW Davenport St. , Portland, Oregon 97201 u1' , Dear Mr. Fields, I This letter is in response to your easement/right-of-way request that was sent to Metro Regional Government on February 8th, 2005. Metro staff have reviewed your request and determined that the proposal alters the Open Space to the point of significant negative I impact to the natural resource. The proposal was put up against the Metro easement policy,point by point, to make this determination. Your request is being denied. If you have further questions,please call me at 503-797-1554. `ISM . Sincerely, •,' - ,� Laurie Wulf I Metro Regional Parks ,';; ; 600 NE Grand Ave Portland, Or 97232 , \ C: Michael Wells f .-. 1.4;: :ym li ;,14 Recycled Paper +`'• www.metro-raglOn.org { 1 TOD 797 1604 ; 4;i• 08/28/2008 THU 09:11 [TX/RX NO 5708] 0001 fa � E,XHIBIr I I 2OOg ESEE ANALySIS • I Wall Street Extension,Phase 2 Comprehensive Plan Amendment&Sensitive Lands Review IFebruary 2009 Narrative Demonstrating Compliance with 18.775.130 IDescription of the Goal 5 ESEE process The Goal 5 process follows three steps. The first step is to identify significant fish and wildlife habitat. The I .economic, social, environment and energy (ESEE) analysis is the second step. The third step is to develop a program to protect significant fish and wildlife habitat. III Specifically,the rule requires the following steps: 1. Identify conflicting uses; 2. Determine the impact area; I 3. Analyze the ESEE consequences; and 4. Develop a program to achieve Goal 5. First, governments must identify conflicting uses that exist, or could occur, with regard to significant Goal 5 1 resource sites (fish and wildlife habitat). A conflicting use is a land use or activity that may negatively impact the resource site. Second, the rule requires a determination of the impact area, representing the extent to which land uses or activities in areas adjacent to resources could negatively impact the resource. The impact area identifies I the geographic limits within which to conduct the ESEE analysis for significant resource sites. Third, the ESEE consequences analysis considers the impact of a decision to fully protect the resource, fully allow conflicting uses, or limit the conflicting uses. 1 Jurisdictions that choose to limit conflicting uses must do so in a way that "protects the resource to the desired extent." The standards identified by the state for completing the ESEE analysis are procedural rather than I substantive. Findings must show that the steps of the ESEE analysis are met, but OAR 660-23-040 states that: "[tJhe ESEE analysis need not be lengthy or complex, but should enable reviewers to gain a clear understanding of the conflicts and consequences to be expected." tIn this case,the inventory has been completed and the impact area has been defined. This application does provide more accurate inventory information,but it is a refinement of the existing inventory completed in 2005 rather than a new inventory. IFor the purpose of this application, the "conflicting use" proposed is the wetland impacts necessary to provide access to the applicant's property that appear on Tigard's Sensitive Lands map. The City of Tigard's zoning I ordinance, specifically Section 18.775, which implements Oregon's Goal 5 does not permit these changes to occur. In order to propose these changes,the application includes an ESEE as required by 18.775.130. I The ESEE tables below present ESEE consequences similar to what was done for Phase 1 of the Wall Street extension project. These tables contemplate the potential impacts of constructing a bridge across Fanno Creek as described in Phase 2 of the Wall Street extension project, and the comparative positive and negative consequences I . of the project. As articulated in this proposal, the intent of extending Wall Street in this case is to provide access to undeveloped property owned by Fred Fields (applicant). Nevertheless, this extension is shown on the City's Transportation System Plan as a future collector street that would provide additional improved east-west access rail lines that essentially bisect Tigard. Note that the subject property is currently designated for industrial Iacross uses. This analysis therefore identifies the potential industrial development of Mr. Fields' property. Regardless of the zoning designation for this property, the proposed bridged access is necessary and the 1 conclusions of this analysis are essentially similar. I IH:\PROJECTS\207033402\WP\090204-Comp Plan ESEE.doc VIM Me • OM MI S MI MB • — r s — r MO i UM s Wall Street Extension,Phase 2 Comprehensive Plan Amendment&Sensitive Lands Review February 2009 Wall Street Phase 2 ESEE Analysis (Assumed Industrial Zoning) Positive Consequences Negative Consequences ALLOW Economic • Employment and income related to construction and • Property values of adjacent landowners could be negatively (Allow) development activities would not be negatively affected by affected due to loss of aesthetic and open space benefits. a reduced land supply due to additional Goal 5 regulations. • Private costs of construction. • Potential for industrial development of the subject property, • Moderately increased municipal service costs. contributing to job growth and economic development. • Positive impact on value of benefiting property. • Potential of future connection with Hunziker Rd. is preserved. Social • No change in property rights due to Goal 5 requirements. • Potential loss of some passive recreational and educational (Allow) • No takings concerns for resource property owners due to opportunities. Goal 5 requirements. • Potential loss of some scenic and aesthetic benefits. • Resource property owners not disproportionately impacted • Temporary disruptions to adjacent properties due to noise and by resource protection requirements. light related to facility construction. • Adjacent properties may be better maintained and • Potential negative livability impacts to residential areas from monitored, limiting potential criminal activities in the area. future industrial activities. Environmental • Restoration, enhancement or creation of natural resource • Potential for construction-related erosion. (Allow) functions and values from Title 3 water quality regulations. • Increased noise, light and glare. • Provision of wetland buffers and conservation easements • Temporary disruption to species habitat during construction. in accordance with CWS requirements. • Functionality of some habitat area may be compromised. Energy • Potential improvement in transportation conditions or • Temporary high energy uses levels related to construction. (Allow) reduction in energy use due to reducing congestion by • Energy used for street lighting. eventually connecting Hall and Hunziker via Wall Street. PROHIBIT Economic • Developer avoids cost of construction. • Employment and income related to construction of project is (Prohibit) • No future public costs related to maintaining the facility. eliminated. • Affected property remains undeveloped, eliminating the chance for industrial land use. • Property does not fulfill its function as intended by zoning. H:\PROJECTS\207033402\WP\090204-Comp Plan ESEE.doc i an i i i, i i an i i i i i i i Wall Street Extension,Phase 2 Comprehensive Plan Amendment&Sensitive Lands Review February 2009 Wall Street Phase 2 ESEE Analysis (Assumed Industrial Zoning) Positive Consequences Negative Consequences Social • No reduction in potential open space preservation in the • No potential for Wall Street linkage, thereby eliminating (Prohibit) affected area. potential congestion reduction and travel time benefits. • No impact to surrounding properties and residents from • Potential change in property rights creating a takings concern. construction activities. • Resource property owners potentially disproportionately • No impact to scenic and aesthetic quality of the affected impacted by resource protection requirements. area. • Surrounding property remains inaccessible, increasing the chances for illegal activities. Environmental • No or extremely low potential for additional impacts to • Lost ability to gain enhancement or restoration through (Prohibit) natural resources. development mitigation. • Avoided potential for erosion. • Some lost opportunity for voluntary property owner • No resulting increase in noise, light or glare. stewardship. • Avoided potential downstream water quality impacts. • No wetland buffers or conservation easements in accordance with CWS requirements provided on adjacent industrial property. Energy • No energy resources utilized to construct or maintain • No potential improvement in transportation conditions or (Prohibit) project. reduction in energy use due to reducing congestion by eventually connecting Hall and Hunziker via Wall Street. H:\PROJECTS\207033402\WP\090204-Comp Plan ESEE.doc Wall Street Extension,Phase 2 Comprehensive Plan Amendment&Sensitive Lands Review February 2009 ESEE: Summary of Conclusions ' An ESEE analysis typically includes an ESEE recommendation or conclusion. This ESEE conclusion applies to single resource site and surrounding area for a specific project in the City of Tigard. The consideration of the ESEE consequences is specific in this sense, but the arguments apply to the entire City. The arguments contemplate competing needs, from economic development to ecological preservation. The ESEE analysis is not a purely objective exercise that follows a known set of rules. There is no Y p Y J guidance in state law that provides a formula for execution of the analysis and corresponding results. The interpretation of and acting upon ESEE results is therefore an area subject to alternative viewpoints and values. Nevertheless, as a proxy for the City, the applicant believes that selection of the "Allow" alternative should be adopted. This recommendation is based on an "on-balance" review of the rcomparative benefits, costs, and drawbacks of adopting the"Allow" alternative. Development of Fred Fields' property has been the subject of much negotiation with the City over the ' last five years. While not directly factored into the ESEE analysis, attempts to develop Fields' property must be acknowledged as the context for the proposed transportation facility. Allowing the Phase II expansion (a bridge over Fanno Creek and related facilities) will enable the future development of the Fields' property, whereas denying the request for the expansion would have the ultimate affect of essentially rendering the parcel undevelopable. Clearly, the central question is: on balance, does the potential harm to affected wetlands and streams outweigh the potential economic and social benefits that will likely result from the proposed Phase II expansion? With respect to ESEE findings, one must look at the temporary and long-term impacts of constructing the bridge. There would be temporary disturbance to the riparian habitat surrounding the creek during construction and the potential for stream bank erosion and accidental impacts to water and resource quality. However, sufficient development regulations and performance standards are in place such that if they are followed, no permanent damage to the waterway will occur. Any construction activities would necessitate extensive erosion control measures and environmental "best practices," and no stream modification or permanent impacts to water quality are likely to occur. If adverse impacts to the stream t occur despite these protective measures, such impacts would be temporary. Long-term impacts to the stream and adjacent habitat areas could very well have positive aspects. First, the bridge would allow ' animal species to travel underneath the bridge, which would represent no significant habitat degradation to most aquatic species such as fish and amphibians. Larger species may have more trouble traversing the roadway, but several roads already cross this wildlife corridor, suggesting that this affect would be ' minimal. More importantly, mitigation requirements imposed by the City and Clean Water Services would require significant mitigation of wetland impacts, suggesting that the ultimate condition of the Fanno Creek corridor would improve as a result of the roadway extension. Such was the case in Phase 1, which resulted in significantly improved fish habitat and water quality in both Pinebrook Creek and Fanno Creek. 1 r H:\PROJECTS\207033402\WP\090204-Comp Plan ESEE.doc Wall Street Extension,Phase 2 Comprehensive Plan Amendment&Sensitive Lands Review February 2009 While any potentially negative environmental affects have already been mitigated in accordance with agency permits (ie. ODSL and Army Corps), the social and economic consequences are vastly different between the "allow" and "prohibit" alternatives. If allowed, development of the facility would have two very clear benefits. First, it would help accomplish the eventual connection of Hall Blvd. and Hunziker tRoad, via Wall Street, which is called for in the City's Transportation System Plan. It would also allow development of the Fields site, providing temporary construction jobs. Alternatively, prohibiting construction of the facility would prevent any potential disruptions to surrounding properties from the project itself, but would preclude effective development of the subject property and any related public and private benefits, including related economic and social benefits. The decision between the two alternatives can be cast in relatively simple terms: to allow would result in relatively minor impacts to the identified resource (which have already been mitigated resulting in a better post-development condition), or the Fields property could be used as designated. Prohibiting the ' facility would preclude any further potential impacts to the Goal 5 resource, but would also preclude development of the Fields parcel. This would also limit opportunities for wetland/stream corridor enhancement stemming from development-related mitigation requirements. While the physical condition of the resource and the surrounding area may be preserved in the latter scenario, all potential economic growth would be negated and legal questions related to takings may arise. An on-balance analysis indicates that the "allow" alternative should be adopted because it will result in significantly more potential economic and social benefits, while the potential environmental and energy consequences would be minimal. 1 1 1 1 . 1 H:\PROJECTS\207033402\WP\090204-Comp Plan ESEE.doc • J U) - mom a mom - ' • , „ T. I 1 ,..,... -•''. CO i Z i L..).' i ..„,:...-;'+L.)), „ •• , - 3.! Z ' M ; . , 0 2 --1/z1t 1 :.•*•:.N.,„ ,. •• . ... . ..• ... . • ...• ..... •••• i ..',...,...8,• ,---- 0 0 .. . 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