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Report (58) s \-\\)3.-) , Taco Bell Scrape and Rebuild Final Stormwater Report OFFICE COP RECEIVED 13305 SW Pacific Hwy JUL 11 2018 Tigard, OR CITY OF TIGARD BUILDING DIVISION May, 2018 (cso PRWes, Prepared By: � `` 497 £F �9 All County Surveyors and Planners, Inc. : 172 Ray L. Moore, P.E. er. David R. Reichert, L.S.I.T. 4 r� ls1t P.O. Box 955 }" Maps' Sandy, Oregon 97055 RENEWAL DATE: 12/31/2018 Phone: 503-668-3151 l".444 Prepared For: Weber Coastal Bells ‘./141Air Attn: Lindsay Johnston PO Box 23408 Eugene, OR 97402 Phone: 541-687-8445 TACO BELL.. Job#17-081 Table of Contents Description Page(s) Summary 1 Water Quality Calculations 2 Existing Conditions Sketch Exhibit A Impervious Area Sketch Exhibit B Clean Water Services LIDA Sizing Form Exhibit C LIDA Non Structural Rain Garden Detail Exhibit D Rain Garden Operation & Maintenance Plan Exhibit E Infiltration Planter / Rain Garden Operation and Maintenance Plan (continued) Annual inspections are required. It is recommended that the facility is inspected on a monthly basis to ensure proper function.The plan below describes V inspection and maintenance activities, and may be used as an inspection log. Contact the design engineer, Clean Water Services or City representative for more information. a N Identified Problem Condition to Check for Maintenance Activity Maintenance Timing V Task Complete Comments Hazard Trees Observe dead,dying or diseased trees Remove hazard trees. A certified As Needed arborist may need to determine health of tree or removal requirements Poor Vegetation Coverage 80%survival of approved vegetation Determine cause of poor growth and and no bare areas large enough to correct the condition.Replant per the affect function of facility. approved planting plan and applicable SPRING FALL standards at the time of construction. Ideal time to plant is spring and Remove excessive weeds and all fall seasons invasive plants. N O Trash and Debris Visual evidence of trash,debris or Remove trash and debris from facility. dumping Dispose of properly a SPRING SUMMER FALL WINTER O Contaminants and Pollu- Evidence of oil gasoline,contaminants If contaminants or pollutants are rD tion or other pollutants.Look for sheens, present,coordinate removal/cleanup odor or signs of contamination. with local jurisdiction SPRING SUMMER FALL WINTER Q O O Erosion Erosion or channelization that impacts Repair eroded areas and stabilize using or effects the function of the facility or proper erosion control measures. * creates a safety concern Establish appropriate vegetation as �1WE needed. FALL WINTER SPRING Flow Not Distributed Flows unevenly distributed through Level the spreader and clean so Evenly planter width due to uneven or that flows spread evenly over entire clogged flow spreader planter width WINTER SPRING LO Ln Infiltration Planter / Rain Garden Operation and Maintenance Plan (continued) Annual inspections are required. It is recommended that the facility is inspected on a monthly basis to ensure proper function.The plan below describes inspection and maintenance activities, and may be used as an inspection log. Contact the design engineer, Clean Water Services or City representative for more information. Identified Problem Condition to Check for Maintenance Activity Maintenance Timing V Task Complete Comments Vector Control Evidence of rodents or water piping Repair facility if damaged.Remove As Needed through facility via rodent holes. harmful insects,use professional if 0 Insects such as wasps and hornets needed.Refer to Clean Water Services interfere with maintenance/inspection Integrated Pest Management Plan for activities management options CD ro Sediment Accumulation in Sediment depth in treatment area Remove sediment from treatment Treatment Area exceeds 3 inches area.Ensure planter is level from side to side and drains freely toward SUMMER FALL outlet;no standing water within 24 hours after any major storm(1-inch Ideally in the dry season in 24 hours) ro Standing Water Standing water in the planter Remove sediment or trash blockages; between storms'that does not drain improve end to end grade so there is 4 freely.Water should drain after 24 no standing water 24 hours after any WINTER SPRING hours of dry weather major storm(1-inch in 24 hours) Inspect after major storm (1-inch in 24 hours) Grate Damaged,Missing Grate is missing or only partially in Grate must be in place and meets As Needed or Not in Place place may have missing or broken design standards.Replace or repair grate members any open structure a I ,A rn Summary Weber Coastal Bells has proposed to scrape and rebuild the Taco Bell Restaurant located at 13305 SW Pacific HWY,Tigard, Oregon. The new restaurant will be constructed in the same onsite location as the existing restaurant. The existing drive thru aisle will remain and the existing parking area will remain. There will be minimal site improvements and modifications. All County Surveyors & Planners, Inc. has designed a Low Impact Development Approach (LIDA) Rain Garden (with associated piping) to supplement the existing onsite stormwater management system and meet the stormwater management requirements of the City of Tigard and Clean Water Services for New Impervious Surfaces, Modified Impervious Surfaces, and Permanently Removed Impervious Surfaces. P:\Documents\2017 Documents\17-081 Taco Bell-Tigard,OR\Stormwater\17-081 Storm Report.docx 1 Water Quality Calculations Per Clean Water Services Design and Construction Standards 4.05.5.c: Treatment = New Impervious Area + 3(Modified Impervious Area—Permanently Removed Impervious Area) New Imp. 1,104 SF Modified Imp. 3,687 SF Permanently Removed 1,321 SF Treatment= 1,104+ 3(3,687+ 1,321) =8,202 SF Per the Clean Water Services LIDA Sizing Form, the required LIDA Facility size is 492 SF. The Facility Size of the proposed Non-Structural Rain Garden is 508 SF. 508>492 The requirement is met. Conclusion The proposed LIDA Non-Structural Rain Garden will provide adequate water quality treatment for the Tigard Taco Bell site at Highway 99W. P:\Documents\2017 Documents\17-081 Taco Bell-Tigard,OR\Stormwater\17-081 Storm Report.docx 2 IMPERVIOUS AREA SKETCH AREA TABLE NEW IMPERVIOUS AREA 1,104 SF MODIFIED IMPERVIOUS AREA 3,681 SF - PERMANENTLY REMOVED 1,321 SF IMPERVIOUS AREA TREATMENT 1,104 + 3 x (3,681 - 1,321) = NEW IMP. + 3 x (MODIFIED IMP. - , 8,202 SF PERMANENTLY REMOVED IMP.) e3--- -- PROPERTY 3\ ��?S �" t,.- �"N�� 2P \ \ \ BOUNDARYiikA i \ \ \ \ :2 1 \ / `\ \ ./— ' ; \ \ \ - 1 v. 1 r 1 ,.. ......, , , \ -??>,_T :......_., c . 1 ,3. \ , j- 1 A \111111 2.28 i ' • — II :F • \‘iC3, • '---.,.------ , \\ \ - 229` _ _ '2�� 9\ eanntv 1L •.'y/y'� ...,.— \ 1 - 20 \I tl ' \ :, ipt. \ 4. J ( .?8;;r 1 14 e \ , ai0 ,ice \ Sun`' ') \ '''' L ,•'' ‘ SCALE : I" = 40' Surveyors & Planners. Inc. 0' 20' 40' 80' Surveying, Planning IX and Civil Engineering It P.O. Box 955 Sandy, OR 97055 Phone: (503) 668-3151 Fax: (503) 668-4730 11-081 Dear Subject to General Conditions 2006 DATE OF P Ot: OS-18-18 Exhibit B Impervious Area Sketch EXISTING CONDTIONS SKETCH \ I -v `o ._ PROPERTY ? ; .w. �` tj li BOUNDARY ^ N S` 1,. ;w*,, n N \ 1 b_\ p (: 4 v 5 -,, --, \ al ' ,: z ILI . \ 01 g +- �� 'f ''•,;')'/' 'W,. s. . PINE! 177'r MIICbz Q "xIII IF- 1111 r' 0 rk �� !=i1: ' , \<.) I R;:" \ - U `` . \230` , i. I f .. -\p 1\0), \St t• \ \ \ � ,;- . 7 t $ e} l .\ l\ W W v�, .. ■ ‘ \1(011** I , ep _ , , , ri> ,,,, ,,,, ' I li ,i,_ a e� uw� . sta SCALE : 1" = 40' Surveyors & Planners. Inc. IIIIM Surveying, Planning 11= IIIII and Civil Engineering 1 0' 20' 40' 80 P.O. Box 955 Sandy, OR 97055 Phone: (503) 668-3151 Fax: (503) 668-4730 11-081 Deetgn.dug Subject to General Conditions 2006 DATE OF PLOT: 05-18-18 Exhibit A Existing Conditions Sketch Exhibit C Clean Water Services LIDA Sizing Form Clean Water Services LIDA Sizing Form Project Title: Tigard Taco Bell at 99W—Scrape and Rebuild Project Location: 13305 SW Pacific Hwy Contact Name/Title/Company: All County Surveyors& Planners, Inc. Phone/e-mail: davePallcountvsurvevors.com STEP 1: Determine Impervious Area Requiring Treatment Total Site Area (acres): 0.73 acres Total Existing Impervious Area (sq.ft.): 18,673 SF Proposed New Impervious Area (sq.ft.): 1,104 SF Impervious Area Requiring Treatment(sq.ft.) 8,202 SF (Refer to Design&Construction Standards Chapter 4 for instructions to calculate this area,which will be less than or equal to the new plus existing site impervious area.) STEP 2: Deduct Impervious Area LIDA Credits Porous Pavement(sq. ft.): 0 Green Roof (sq. ft.): 0 Other Credits as approved (sq. ft.): I 0 Total Credits (sq. ft.): 0 Remaining Impervious area (sq. ft.) (Total from Step 1 —Total Credits): 8,202 SF STEP 3: Size LIDA Facilities for Remaining Impervious Area IA: Impervious SF,Sizing LIDA facility size area treated Factor (sq.ft.) (IA x SF) (sq.ft.) Infiltration Planters/Rain 8,202 SF 0.06 492 SF Garden Flow-through Planter 0,06 LIDA Swale 0,06 Vegetated Filter Strip 0.06 Total Impervious (`Must equal total from Step 2 or additional LIDA Area treated (sq.ft.) 8,202 SF facilities or Water Quality Facilities must be added.)) cacanwatcr Scr icCS Low Impact Development Approaches Handbook 19 HIGH DENSITY JUTE OR 6" MIN— COCONUT MATTING FREEBOARD OVERFLOW TO 3:1 (H:V) MAXIMUM SLOPE CONVEYANCE. MAINTAIN MAXIMUM LINEAR O n SEPARATION FROM ALL Q STORM INFLOW POINTS \ 1/ ..........�fv��4�, • y • '' [ �I/ .� � I Ir I I I.�II I II i II I II I II Ii I 1 III , II _ — MIN --111:7----111H1 —I *�. �, AIS I \ _I-111=11111 111111 111— 11=111-11 11 I III �" ' _ _ I 1 I-111 III - 11 I-11 I—I 11 111=111=111==111=11 111 111=1 1 1 1 1 111 1= 11=111=1(1=11 I I I 1 I 1=1 I I 1 11=1 1 1=1 H 18" MIN GROWING MEDIUM _ \, \.\ , . ;v II-111 I I 111 III III III -11LE-111:771111 —111 III III 111-111 111-111 III -11 — jvw . \>ivvivvii��i 111 1E1 11=111=111=111=111E1 1111111 111 I—111—I 11=11=11 I-111=1 1 — ,�'�i/vv%3"�DEEP (3/4" — 1/4") vivivivivi f — �< � 111 �I 1=111E-EF-" - 1 I I 1=11 ISI l.X'r' /> �j/� CLEAN CRUSHED DRAIN ROCK � d �. ti�v27. „'s -0.•!rx,ae s� •�o�� '. ��AA 9 DEEP (1-1/2" - 3/4") /\ _��.�� .7" � ��.�.0 f K' CLEAN CLEAN CRUSHED DRAIN ROCK ‘vA, A�VA\ c < /\//`,/ OVERFLOW TO ��j\��%VA� �%VAS%VAS CONVEYANCE NATI VE \/��/ // / /��/�jX j// yi>%��//v) '/ `/ SUBGRADE A NON—WOVEN GEOTEXTILE FILTER FABRIC NOTES: 1. PUBLIC WATER QUALITY AND/OR QUANTITY SYSTEM 2. PROVIDE OVERFLOW CONVEYANCE SYSTEM, OVERFLOW CONVEYANCE HEIGHT TO ALLOW 6" MAXIMUM PONDING, PIPING TO A MINIMUM OF THE PLUMBING CODE OR CONVEY THE 25 YEAR STORM. 3. IF USING THE NATIVE SOIL INFILTRATION FOR SIZING, THE RATE SHALL BE DETERMINED BY ASTM STANDARD TESTING METHODS. 4. FLOW DISSIPATORS SHOULD BE USED IF ENTRY SLOPE TO THE BASIN IS GREATER THAN 3:1. FLOW DISSIPATORS SHALL BE CONSTRUCTED OUT OF ROCK OR GRAVEL PER DESIGN FLOW VELOCITY AT ENTRY OF THE FACILITY. 5. TREATMENT AREA SHALL HAVE HIGH DENSITY JUTE OR COCONUT MATTING OVER 18" MINIMUM OF GROWING MEDIUM OR BASE STABILIZATION METHOD AS APPROVED BY THE DISTRICT. 6. VEGETATION TO BE USED IN WET AREAS OF THE BASIN IS PER APPENDIX "A" OF R&0 07-20 FOR THE WET MOISTURE CONDITIONS. 7. VEGETATION TO BE USED IN OTHER AREAS OF BASIN CONFORMS TO PLANT LIST OF THIS HANDBOOK AS APPROVED BY DISTRICT. NON-STRUCTURAL LIDA PLANTER/RAIN GARDEN HANDBOOK C1eanWate\ Services DRAWING NO. 797 REVISED 05-16 CleanWater'Services Low Impact Development Approaches Handbook 125 Exhibit D LIDA Non Structural Rain Garden Detail Infiltration Planter / Rain Garden Operation and Maintenance Plan Annual inspections are required. It is recommended that the facility is inspected on a monthly basis to ensure proper function.The plan below describes inspection and maintenance activities, and may be used as an inspection log. Contact the design engineer, Clean Water Services or City representative for more information. Identified Problem Condition to Check for Maintenance Activity Maintenance Timing V Task Complete Comments Invasive Vegetation as Invasive vegetation found in facility. Remove excessive weeds and all outlined in Appendix A Examples include:Himalayan Blackberry; invasive plants.Attempt to control o Reed Canary Grass;Teasel;English Ivy; even if complete eradication is not Nightshade;Clematis;Cattail;Thistle; feasible.Refer to Clean Water Services Scotch Broom Integrated Pest Management Plan for SPRING SUMMER FALL appropriate control methods,including proper use of chemical treatment. CDCDrD Obstructed Inlet/Outlet Material such as vegetation,trash, Remove blockages from facility sediment is blocking more than 10% ;111y, of the inlet pipe or basin opening WINTER SPRING Inspect after major storm (1-inch in 24 hours) sv sExcessive Vegetation Vegetation grows so tall it competes Cut tall grass 4"to 6"and remove 0 with or shades approved emergent clippings.Prune emergent wetland wetland grass/shrubs;interferes with grass/shrubs that have become SPRING access or becomes a fire danger overgrown. Ideal time to prune emergent wetland grass is spring.Cut grass during dry months Tree/Shrub Growth Tree/shrub growth shades out Prune trees and shrubs that block sun wetland/emergent grass in treatment from reaching treatment area.Remove area. Interferes with access for trees that block access points. WINTER maintenance/inspection Do not remove trees that are not interfering with access or maintenance Ideal timing for pruning trees is without first contacting Clean Water winter c Services or local City. 7 Exhibit E Rain Garden Operation & Maintenance Plan