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State Of Oregon, Pfaffle Office - Maintain Stormwater/Water Treatment Facilities Washington County Oregon 2008-063140 07/17,'2008 02:23 24 PM D-IPPS Cnt=1 Stn=21 RECORDS1 S100 00 S5.00 S11 00-Total=S116 00 01272240200800631400200201 i.Richard Hobemicht Director of Assessment and - Taxation and Ex-Cffcio County Clerk,for Washington county Oregon,do hereby certify that the withir, instrument of writing was received and recorded in the book,of records of said courytj{.. Ir.f T� _. Richard Hobernicht Director of Assessment and - Taxation.Ex-Officio County Clerk p® t After Recording Return to: City of Tigard 13125 SW Hall Blvd. Tigard, OR 97223 AGREEMENT TO MAINTAIN STORMWATER DETENTION AND WATER QUALITY TREATMENT FACILITIES This Agreement is made and entered into this 14-day of 2008,by and between the City of Tigard,a municipal corporation of the State of Oregon(CITY),and PCC .LLC and Pfaffle Office LLC,(collectively, OWNER). RECITALS 1. OWNER has developed (select one, or both if applicable): ® Private stormwater detention or retention Facilities ® Private Water quality treatment Facilities 2. The Private stormwater detention and water quality treatment Facilities (Facilities) enable development of property while mitigating the impacts of additional surface water and pollutants associated with stormwater runoff prior to discharge from the property to the public stormwater system. The consideration for this agreement is connection to the public stormwater system. 3. The property benefited by the Facilities and subject to the obligation of this Agreement is described in Exhibit A(Provertv). The Operations and Maintenance Plan for the CatchBasin StormFilterTM Facility is described in Exhibit B. The Maintenance Checklist for Closed Detention Systems to assist with the successful completion of the operation and maintenance of the detention facility is described in Exhibit C. Exhibits A through C are attached hereto and incorporated by reference. 4. Facilities are designed by a registered professional engineer to accommodate the anticipated volume of runoff and to detain and treat runoff in accordance with Clean Water Services Design and Construction Standards. 5. CITY and OWNER agree that effective maintenance of the Facilities will best be facilitated by regular inspections,not less than twice a year,those times being generally described as once in the early spring and again in the fall prior to the onset of fall rains. 6. Failure to inspect and maintain Facilities can result in an unacceptable impact to the public stormwater system. NOW, THEREFORE, it is agreed by and between the parties as follows: I. OWNER INSPECTIONS OWNER shall provide inspections of the Facilities at least once a year for Private water quality treatment Facility and twice a year for Private stormwater detention Facility for conformity with the requirements set forth in Exhibits B and C respectively. At a minimum, one inspection shall occur prior to the onset of fall rains during the period of September 1 to October 15, and a second inspection shall occur in early spring Page 1 of 5 during the period April 1 to May 31. OWNER shall maintain a log of inspection activities. The log shall be available to the CITY upon request or during CITY inspections. H. DEFICIENCIES All aspects in which the Facilities fail to satisfy the Operations and Maintenance Plan for the CatchBasin StormFilterTM or the Maintenance Checklist for Closed Detention Systems shall be noted as "Deficiencies". III. OWNER CORRECTIONS All Deficiencies shall be corrected at OWNER'S expense within thirty(30) days after completion of the inspection. If more than 30 days is reasonably needed to correct a Deficiency, OWNER shall have a reasonable period to correct the Deficiency so long as the correction is commenced within the 30-day period and is diligently prosecuted to completion. IV. CITY INSPECTIONS OWNER grants CITY the right to inspect the private stormwater water quality and/or detention Facilities. CITY will endeavor to give ten (10) days prior written notice (as courtesy to OWNER), except that no notice shall be required in case of an emergency. CITY shall determine whether Deficiencies need to be corrected. OWNER(at the address provided at the end of this Agreement, or such other address as OWNER may designate in writing to City) will be notified in writing through the US Mail of the Deficiencies and shall make corrections within 30 days of the date of the notice. V. CITY CORRECTIONS If correction of all OWNER or CITY identified Deficiencies is not completed within thirty(30) days after OWNER'S inspection or CITY notice, CITY shall have the right to have any Deficiencies corrected. CITY (i) shall have access to the Facilities for the purpose of correcting such Deficiencies and (ii) shall bill OWNER for all costs reasonably incurred by CITY for work performed to correct such Deficiencies (City Correction Costs) following OWNER'S failure to correct any Deficiencies in the Facilities. OWNER shall pay CITY the City Correction Costs within thirty(30) days of the date of the invoice. OWNER understands and agrees that upon non-payment, City Correction Costs shall be secured by a lien on the Property for the City Correction Cost amount plus interest in the amount of 12%/annum until principal and interest is fully paid. VI. EMERGENCY MEASURES If at any time CITY reasonably determines that the Facilities create any imminent threat to public health,. safety or welfare, CITY may immediately and without prior notice to OWNER take measures reasonably designed to remedy the threat. CITY shall provide notice of the threat and the measures taken to OWNER as soon as reasonably practicable, and charge OWNER for the cost of these corrective measures. VII. FORCE AND EFFECT This Agreement has the same force and effect as any deed covenant running with the land and shall benefit and bind all owners of the Property present and future, and their heirs, successors and assigns. Page 2 of S i VIII. UPGRADES OWNER is not required to improve or upgrade the Facilities if code requirements change unless OWNER materially redevelops any portion of the Property as defined by Clean Water Services Design and Construction Standard or that requires land use approval by CITY. In that event CITY may require OWNER to make upgrades or improvements to the Facilities to meet current code requirements. IX. THIRD PARTY RIGHT OF ENFORCEMENT Clean Water Services (DISTRICT) is an intended third party beneficiary of this Agreement and is hereby granted a third party right of enforcement. As such, DISTRICT may exercise all of the rights and remedies provided to CITY herein. DISTRICT and CITY each have independent authority to enforce the terms of this Agreement; provided, however, that DISTRICT expects that CITY shall have primary responsibility for monitoring and enforcement of the Agreement. X. AMENDMENTS The terms of this Agreement may be amended only by mutual agreement of the parties. Any amendments shall be in writing, shall refer specifically to this Agreement, and shall be valid only when executed by the owners of the Property, CITY and DISTRICT and recorded in the Official Records of Washington County. XI. PREVAILING PARTY In any action brought by either party to enforce the terms of this Agreement, the prevailing party shall be entitled to recover all costs, including reasonable attorney's fees as may be determined by the court having jurisdiction, including any appeal. XII. SEVERABILITY The invalidity of any section, clause, sentence, or provision of this Agreement shall not affect the validity of any other part of this Agreement, which can be given effect without such invalid part or parts. Page 3 of 5 IN WITNESS WHEREOF, OWNER, CITY, and DISTRICT have signed this Agreement. CITY OF TIGARD PCCC, LLC By : 'K� " X44 iCtY Manager Peter R. Stalick Ma (f� g r g CLEAN WATER SERVICES PFAFFLE OFFIC By: By: B y y: General Manager or Designee Roger Stalick, aging Member State of Orel?on ) County of Washington ) This instrument was acknowledged before me on I Ly q , g (date) by Peter R. Stalick, as Managing Member of PCCC, LLC. OFFICIAL SEAL /(�p�,(� pr LA SHIRLEY L TREAT / NOTARY PUBLIC-OREGON Notary Public for AgY Or-` j,,(W6 COMMISSION NO.416M MY COMMISSION EXPIRES APRIL 25,2011 State of Oregon ) County of Deschutes ) This instrument was acknowledged before me onJ u�y 5�.100 (date) by Roger D. Stalick, as Managing Member of Pfaffle Office, LLC. OFFICIAL SEAL Notary Public for '� /i r:VW 6,t AA DELORES TRAHAN NOTARY PUBLIC-OREGON COMMISSION NO.424060 MY COMMISSION EXPIRES JAN.12,201 Page 4 of 5 State of Oregon ) County of Washington ) This instrument was acknowledged before me on J-W-(4 q, oWV (date) byA raig Prosser, as City Manager of the City of Tigard. OFFICIAL SEAL 8HIRLEY L TREAT `••. _:.' NOTARY PUBLIC-OREGON � �� �. 1-76COMMISSION NO.416M Notary Public for MY COMMISSION EXPIRES AeZ APRIL 23,1011 State of Oregon 1 County of Washington ) Th' instrument was ac nwledged before me on 7/!5 00a (date)by 4e)rk ��VHS, as r g. N- of Clean Water Services. .e L .o Notary Publcor n APPROVED AS TO FORM OFFICIAL SEAL City Attorney TNUDY A HULL NOTARY PUBLIC-OREGON COMMISSION NO-427190 My COMMISSION EXPIRES MAY 9,2012 Page 5 of 5 Exhibit A TRACT 1: A tract of land in the Southwest one-quarter of Section 36,Township 1 South, Range 1 West, of the Willamette Meridian, in the City of Tigard,County of Washington and State of Oregon, described as follows: BEGINNING at a 5/8-inch iron rod with a yellow plastic cap inscribed"G&L PLS 1989"at the Southeast corner of the plat of PFAFFLE PLAZA CONDOMINIUM;thence along the East line of said plat North 00022'30"West, 208.51 feet to a 1-inch diameter copper plug inscribed"Bluedot Group"on the South right-of-way line of SW Pfaffle Street, said point being 31 00 feet from the centerline of said SW Pfaffle Street when measured at right angles to said centerline;thence along said South right-of-way line South 89°29'57"East, 19 77 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot"; thence leaving said right-of-way line South00030'03"East, 36 28 feet to a 5/8-Inch iron rod with a yellow plastic cap inscribed"Bluedot";thence South 21044'39"East, 58 53 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot";thence South 89029'57"East, 88 44 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Biuedot';thence South 00030'03"West, 32 00 feet to a 518- inch iron rod with a yellow plastic cap Inscribed'Bluedot";thence South 89029'57"East, 72.00 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot'; thence South 00030'03"West,27 00 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot'; thence North 89029'57"West, 18 51 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot";thence South 00030'03"West, 32.10 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot"on the Northerly line of that tract of land described as Parcel 1 in Deed Document No. 95037388;thence along said Northerly line North 89029'32"West, 51 16 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"G&L PLS 1989"; thence continuing along said Northerly line South 00032'40" East,26 95 feet to a 518-inch iron rod With a yellow plastic cap inscribed"G&L PLS 1989"; thence continuing along said Northerly line North 891,29'39"West, 130.00 feet to the point of beginning TRACT 2: A tract of land in the Southwest one-quarter of Section 36,Township 1 South, Range 1 West,of the Willamette Meridian, in the City of Tigard, County of Washington and State of Oregon, described as follows: BEGINNING at a 5/8-inch iron rod with a yellow plastic cap inscribed"G&L PLS 1989"at the Southeast corner of the plat of PFAFFLE PLAZA CONDOMINIUM;thence along the East line of said plat North 001122130"West, 208.51 feet to a 1-inch diameter copper plug inscribed"Bluedot Group"on the South right-of-way line of SW Pfaffle Street, said point being 3100 feet from the centerline of said SW Pfaffle Street when measured at right angles to said centerline;thence along said South right-of-way line South 89029'57"East, 19 77 feet to a 518-inch iron rod with a yellow plastic cap inscribed"Bluedot"and the True Point of Beginning;thence continuing along said South right-of-way line South 89029'57" East, 125.08 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot';thence leaving said right-of-way line South 00030'03"West, 90 45 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot";thence South 89029'57"East,66.00 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot";thence South 00030'03"West, 91 11 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot"on the Northerly line of that tract of land described as Parcel 1 in Deed Document NO 95037388; thence along said Northerly line North 89029'32"West,27 00 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot';thence leaving said Northerly line North 0030'03"East, 32 10 feet to a 5/8- inch iron rod with a yellow plastic cap inscribed"Bluedot';thence South 89029'57"East, 18.51 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot";thence North 00030'03" East,27 00 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot"; thence North 89029'57"West, 72 00 feet to a 5/8-Inch iron rod with a yellow plastic cap inscribed"Bluedot";thence North 00030'03"East, 32.00 feet to a 5/8-Inch iron rod with a yellow plastic cap inscribed"Bluedot";thence North 8929'57"West,88 44 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot";the North 21044'39"West, 58.53 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot"; thence North 00030'03"East, 36 23 feet to the True Point of Beginning TRACT 3: Page 7 of Preliminary Comm lime nt Order Number: 09307916-W Exhibit A (Continued) A tract of land in the Southwest one-quarter of Section 36,Township 1.South, Range 1 West, of the Willamette Meridian, in the City of Tigard, County of Washington and State of Oregon, described as follows; BEGINNING at a 5/8-inch iron rod with a yellow plastic cap inscribed"G& L PLS 1989"at the Southeast corner of the plat of PFAFFLE PLAZA CONDOMINIUM;thence along the East line of said plat North 00022'30"West, 208 51 feet to a 1-inch diameter copper plug inscribed"Bluedot Group"on the South right-of-way line of SW Pfaffle Street,said point being 31.00 feet from the centerline of said SW Pfaffle Street when measured at right angles to said centerline; thence along said South right-of-way line South 89029'57"East, 144 85 feet to a 5/8- inch iron rod with a yellow plastic cap inscribed"Bluedot"and the True Point of Beginning; thence continuing along said South right-of-way line South89029'57"East, 115.10 feet to a 5/8-inch iron rod with a yellow plastic cap inscribed"Bluedot"which bears South 001122'30"East, 31'00 feet from a point on the centerline of SW Pfaffle Street;thence leaving said right-of-way line South 00022'30"East, 181.59 feet to the Northerly line of that tract of land described as Parcel 1 in Deed Document No. 95037388 at a point which bears North 89029'32"West,0 18 feet from a 518-inch iron rod with a yellow plastic cap inscribed"G&L PLS 1989"; thence along said Northerly line North 89029'32"West, 51 87 feet to a 518-inch iron rod with a yellow plastic cap inscribed"Bluedot";thence leaving said Northerly line North 00030'03"East, 9111 feet to a 578-inch iron rod with a yellow plastic cap inscribed"Bluedot';thence North 89029'57"West,66.00 feet to a 518-inch iron rod with a yellow plastic cap inscribed"Bluedot';thence North 00030'03"East, 90 45 feet to the True Point of Beginning. Page 8 of Preliminary Report Order Number; 08307915•W EXHIBIT B i,�►� ! rim Operation and Maintenance STO RM WATER ---� ' CatchBasin StormFilter TM from an inlet pipe discharging directly to the unit vault. The inlet chamber is equipped with an internal baffle,which traps debris Important:These guidelines should be used and floating oil and grease, and an overflow as a part of your site stormwater plan. weir. While in the inlet chamber, heavier solids are allowed to settle into the deep sump,while lighter solids and soluble Overview pollutants are directed under the baffle and The CatchBasin StormFilterTM (CBSF) into the cartridge chamber through a port consists of a multi-chamber steel, concrete, between the baffle and the overflow weir. or plastic catch basin unit that can contain Once in the cartridge chamber, polluted up to four StormFilter cartridges. The steel water ponds and percolates horizontally CBSF is offered both as a standard and as through the media in the filter cartridges. a deep unit. Treated water collects in the cartridge's center tube from where it is directed by an The CBSF is installed flush with the finished under-drain manifold to the outlet pipe on grade and is applicable for both constrained the downstream side of the overflow weir lot and retrofit applications. It can also be and discharged. fitted with an inlet pipe for roof leaders or similar applications. When flows into the CBSF exceed the water quality design value, excess water spills The CBSF unit treats peak water quality over the overflow weir, bypassing the design flows up to 0.13 cfs, coupled with an cartridge bay, and discharges to the outlet internal weir overflow capacity of 1.0 cfs for the standard unit, and 1.8 cfs for the deep steel and concrete units. Plastic units have Applications an internal weir overflow capacity of 0.5 cfs. The CBSF is particularly useful where small flows are being treated or for sites that are Design Operation flat and have little available hydraulic head The CBSF is installed as the primary to spare. The unit is ideal for applications in { receiver of runoff, similar to a standard, which standard catch basins are to be used. grated catch basin. The steel and concrete Both water quality and catchment issues CBSF units have an H-20 rated, traffic- can be resolved with the use of the CBSF. bearing lid that allows the filter to be installed in parking lots,and for all practical purposes, takes up no land area. Plastic Retro-Fit units can be used in landscaped areas and for other non-traffic-bearing applications. The retrofit market has many possible applications for the CBSF. The CBSF The CBSF consists of a sumped inlet can be installed by replacing an existing chamber and a cartridge chamber(s). catch basin without having to "chase the Runoff enters the sumped inlet chamber grade,"thus reducing the high cost of re- either by sheet flow from a paved surface or piping the storm system. I I ©2006 CONTECH Stormwater Solutions Toll-free:800.548.4667 1 of 3 contechstornweter.com Catch6asin StormFilter Operation and Maintenance Guidelines i i I Maintenance Guidelines Maintenance procedures for typical catch Media may be removed from the filter basins can be applied to the CatchBasin cartridges using the vactor truck before the StormFilter(CBSF). The filter cartridges cartridges are removed from the catch basin j contained in the CBSF are easily removed structure. Empty cartridges can be easily and replaced during maintenance activities removed from the catch basin structure by according to the following guidelines. hand. Empty cartridges should be 4 reassembled and returned to CONTECH I 1. Establish a safe working area as per Stormwater Solutions, as appropriate. typical catch basin service activity. Materials required include a lifting cap, 2. Remove steel grate and diamond plate vactor truck, and fresh filter cartridges. cover(weight;�- 100 lbs. each). Contact CONTECH Stormwater Solutions I for specifications and availability of the j 3. Turn cartridge(s) counter-clockwise to lifting cap. The vactor truck must be disconnect from pipe manifold. equipped with a hose capable of reaching areas of restricted clearance. The owner 4. Remove 4" center cap from cartridge may refresh spent cartridges. Refreshed and replace with lifting cap. cartridges are also available from CONTECH Stormwater Solutions on an 5. Remove cartridge(s)from catch basin exchange basis. Contact the maintenance by hand or with vactor truck boom. department of CONTECH Stormwater Solutions at(503)240-3393 for more 6. Remove accumulated sediment via information. vactor truck(min, clearance 13"x 24"). i Maintenance is estimated at 26 minutes of ' 7. Remove accumulated sediment from site time. For units with more than one cartridge bay. cartridge, add approximately 5 minutes for (min. clearance 9.25"x 11") each additional cartridge. Add travel time 8. Rinse interior of both bays and vactor as required. remaining water and sediment. 9. Install fresh cartridge(s)threading j clockwise to pipe manifold. 10. Replace cover and grate. I 11. Return original cartridges to CONTECH Stormwater Solutions for cleaning and j media disposal. ©2006 CONTECH Stormwater Solutions Toll-free:800.548.4667 2 of 3 contechstormwater.com CatchBasin Stormi'llter Operatlon and Maintenance Guidelines i I Mosquito Abatement Using Larvicides in the CatchBasin In certain areas of the United States, StormFilter mosquito abatement is desirable to reduce Larvicides should be used according to the incidence of vectors. manufacturer's recommendations. j Two widely available products are Mosquito In BMPs with standing water, which could Dunks and Summit B.t.i, Briquets. For more provide mosquito breeding habitat, certain information, visit hftp://www.summitchemical.com/mos_ctrl/d abatement measures can be taken. efault.htm. I 1. Periodic observation of the standing The larvicide must be in contact with the water to determine if the facility is permanent pool. The larvicide should also harboring mosquito larvae. be fastened to the CatchBasin StormFilter 2. Regular catch basin maintenance by string or wire to prevent displacement by 3. Use of larvicides containing Bacillus high flows. A magnet can be used with a thuringiensis israelensis(BTI). BTI steel catch basin. is a bacterium toxic to mosquito and For more information on mosquito black fly larvae. abatement in stormwater BMPs, refer to the 1 In some cases, the presence of petroleum following: hydrocarbons may interrupt the mosquito hftp://www.ucmrp.ucdavis.edu/publications/ managingmosquitoesstormwater8125.pdf growth cycle. I ,I I i I I i i i ©2006 CONTECH Stormwater Solutions Toll-free:800.548.4667 3 of 3 contechstorrnwater.com CatchBasin StormFilter operation and Maintenance Guidelines {I I aK r" Q7 r F l4�,�^�'•�r"9�,y,i`''"" % Eli. �y } 1✓ Lre�_ � 75� - 5i a Yt Oki Oi s Maintenance Guidelines In addition to these two activities, it is important to check The primary purpose of the Stormwater Management the condition of the StormFilter unit after mayor storms for StormFilter®is to filter out and prevent pollutants from entering potential damage caused by high flows and for high sediment our waterways. Like any effective filtration system, periodically accumulation that may be caused by localized erosion in the these pollutants must be removed to restore the StormFilter to its drainage area It may be necessary to adjust the inspection/ full efficiency and effectiveness. maintenance schedule depending on the actual operating conditions encountered by the system In general, inspection Maintenance requirements and frequency are dependent on the activities can be conducted at any time, and maintenance should pollutant load characteristics of each site. Maintenance activities occur, if warranted, in late summer to early fall when flows into may be required in the event of a chemical spill or due to the system are not likely to be present. excessive sediment loading from site erosion or extreme storms. It is a good practice to inspect the system after major storm events. Maintenance Frequency The primary factor controlling timing of maintenance of the Maintenance Procedures StormFilter is sediment loading Although there are likely many effective maintenance options, we believe the following procedure is efficient and A properly functioning system will remove solids from water by can be implemented using common equipment and existing trapping particulates in the porous structure of the filter media maintenance protocols. A two step procedure is recommended inside the cartridges.The flow through the system will naturally as follows. decrease as more and more particulates are trapped Eventually the flow through the cartridges will be low enough to require 1 Inspection replacement. It may be possible to extend the usable span of the Inspection of the vault interior to determine the need for cartridges by removing sediment from upstream trapping devices maintenance on a routine as-needed basis in order to prevent material from 2 Maintenance being re-suspended and discharged to the StormFilter treatment system Cartridge replacement Sediment removal Site conditions greatly influence maintenance requirements. StormFilter units located in areas with erosion or active Inspection and Maintenance Timing construction may need to be inspected and maintained more At least one scheduled inspection should take place per year with often than those with fully stabilized surface conditions. maintenance following as warranted The maintenance frequency may be adjusted as additional First, an inspection should be done before the winter season monitoring information becomes available during the inspection program Areas that develop known problems should be During the inspection the need for maintenance should be determined and, if disposal during maintenance will be required, inspected more frequently than areas that demonstrate no samples of the accumulated sediments and media should be problems, particularly after mayor storms Ultimately, inspection obtained and maintenance activities should be scheduled based on the historic records and characteristics of an individual StormFilter Second, if warranted, a maintenance(replacement of the filter system or site It is recommended that the site owner develop cartridges and removal of accumulated sediments)should be a database to properly manage StormFilter inspection and performed during periods of dry weather maintenance programs. Prior to the development of the maintenance database, the following maintenance frequencies should be followed Inspection One time per year After major storms Maintenance y� As needed, based on results of inspection (The average maintenance lifecycle is approximately 1-3 years) � k r. Per Regulatory requirement In the event of a chemical spill Frequencies should be updated as required The recommended ,d' R initial frequency for inspection is one time per year StormFilter kyr•'•, '��p,/.•-,t'w'��:�ie3Y.qi.._ r. units should be inspected after major storms. 2 Sediment removal and cartridge replacement on an as needed 7 Remove safety equipment. basis is recommended unless site conditions warrant. 8. If appropriate, make notes about the local drainage area Once an understanding of site characteristics has been relative to ongoing construction, erosion problems, or high established, maintenance may not be needed for one to three loading of other materials to the system. years, but inspection is warranted and recommended annually 9 Discuss conditions that suggest maintenance and make decision as to weather or not maintenance is needed Inspection Procedures Maintenance Decision Tree The primary goal of an inspection is to assess the condition of The need for maintenance is typically based on results of the the cartridges relative to the level of visual sediment loading as inspection. The following Maintenance Decision Tree should be used as it relates to decreased treatment capacity It may be desirable to a general guide. (Other factors,such as Regulatory Requirements, may conduct this inspection during a storm to observe the relative need to be considered) flow through the filter cartridges. If the submerged cartridges - -,y: R u. ,,:.•�, ,f;,,,,`- are severely plugged,then typically large amounts of sediments will be present and very little flow will be discharged from the drainage pipes. If this is the case, then maintenance is warranted and the cartridges need to be replaced Warning In the case of a spill,the worker should abort inspection activities until the proper guidance is obtained y Notify the local hazard control agency and CONTECH Stormwater Solutions immediately To conduct an inspection Important: Inspection should be performed by a person who is familiar with the operation and configuration of the StormFilter treatment unit. 1 If applicable, set up safety equipment to protect and notify surrounding vehicle and pedestrian traffic. 2 Visually inspect the external condition of the unit and take 1 Sediment loading on the vault floor notes concerning defects/problems. a If >4" of accumulated sediment, maintenance is req u i red 2 Sediment loading on top of the cartridge. 1• , a If >1/4" of accumulation, maintenance is required r 3 Submerged cartridges. a If >4" of static water in the cartridge bay for more ,ate` that 24 hours after end of rain event, maintenance is required N}, -y 4 Plugged media r a If pore space between media granules is absent, maintenance is required -,•i--• ,�, ISM ,7 R :. � �,�t�,.�,`•—>--•�•-- - -''"'�'`�` 5 Bypass condition. a If inspection is conducted during an average rain fall event and StormFilter remains in bypass condition • ii.6^"ice' gra'. '1,:,s .�' ,.- - r'� .� � ':,�oma,'{���T,„I�!-�•y`^, ,y`J ,. ' r � �� (water g over the internal outlet baffle wall or submerged A cartridges), maintenance is required 3 Open the access portals to the vault and allow the system vent. 6 Hazardous material release. 4 Without entering the vault,visually inspect the inside of the a If hazardous material release(automotive fluids or other) unit, and note accumulations of liquids and solids. is reported, maintenance is required 5 Be sure to record the level of sediment build-up on the floor of 7 Pronounced scum line the vault, in the forebay, and on top of the cartridges. If flow a If pronounced scum line(say>_ 1/4”thick) is present is occurring, note the flow of water per drainage pipe Record above top cap, maintenance is required all observations. Digital pictures are valuable for historical documentation. 8 Calendar Lifecycle 6 Close and fasten the access portals. a If system has not been maintained for 3 years maintenance is required 3 Assumptions r w • No rainfall for 24 hours or more a _- y • No upstream detention (at least not draining into StormFiiter) ° • Structure is online • Outlet pipe is clear of obstruction ~f • Construction bypass is plugged t1 Maintenance Depending on the configuration of the particular system, maintenance personnel will be required to enter the vault to perform the maintenance. _ r Important: If vault entry is required, OSHA rules for confined space entry must be followed Filter cartridge replacement should occur during dry weather ' It may be necessary to plug the filter inlet pipe if base flows is ' occurring Replacement cartridges can be delivered to the site or customers facility Information concerning how to obtain the replacement cartridges is available from CONTECH Stormwater Solutions. Warning In the case of a spill,the maintenance personnel a should abort maintenance activities until the proper guidance is obtained Notify the local hazard control _ agency and CONTECH Stormwater Solutions immediately. ' To conduct cartridge replacement and sediment removal maintenance Important: Note that cartridges containing leaf media (CSF)do 1 If applicable, set up safety equipment to protect maintenance hot require unscrewing from their connectors.Take care personnel and pedestrians from site hazards. not to damage the manifold connectors.This connector 2 Visually inspect the external condition of the unit and take .'should_'remain installed in the manifold and could be notes concerning defects/problems. capped during the maintenance activity to prevent sediments from entering the underdrain manifold 3 Open the doors(access portals)to the vault and allow the system to vent. B Remove the used cartridges(up to 250 lbs. each)from the 4 Without entering the vault, give the inside of the unit, vault. including components, a general condition inspection Important: Care must be used to avoid damaging the 5 Make notes about the external and internal condition of "'cartridges during removal and installation The cost of the vault. Give particular attention to recording the level of repairing components damaged during maintenance sediment build-up on the floor of the vault, in the forebay, will be the responsibility of the owner unless CONTECH and on top of the internal components. Stormwater Solutions performs the maintenance activities 6 Using appropriate equipment offload the replacement and damage is not related to discharges to the system cartridges(up to 150 lbs. each)and set aside. C. Set the used cartridge aside or load onto the hauling 7 Remove used cartridges from the vault using one of the truck, following methods: D Continue steps a through c until all cartridges have been Method 1: removed A. This activity will require that maintenance personnel enter the vault to remove the cartridges from the under drain Method 2: manifold and place them under the vault opening for A. Enter the vault using appropriate confined space lifting (removal) Unscrew(counterclockwise rotations) protocols. each filter cartridge from the underdrain connector Roll the loose cartridge, on edge,to a convenient spot B Unscrew the cartridge cap beneath the vault access. C. Remove the cartridge hood screws(3) hood and float. Using appropriate hoisting equipment, attach a cable D At location under structure access, tip the cartridge on its from the boom, crane, or tripod to the loose cartridge. side. Contact CONTECH Stormwater Solutions for suggested attachment devices 4 Important: Note that cartridges containing media other than 11 Close and fasten the door the leaf media require unscrewing from their threaded 12 Remove safety equipment. connectors.Take care not to damage the manifold 13 Finally, dispose of the accumulated materials in accordance connectors.This connector should remain installed in the with applicable regulations Make arrangements to return the manifold and capped if necessary used empty cartridges to CONTECH Stormwater Solutions. D Empty the cartridge onto the vault floor Reassemble the empty cartridge E Set the empty, used cartridge aside or load onto the hauling truck. — F Continue steps a through e until all cartridges have been ` = `• i removed .;n.,,. �a.,._. •mak�'r-:' .-- ^_ - _ X,✓w�,Y.Y,1'�11 yri�/�1'^a�a..Lil •x µ 'w .I o B�� F f i� 8 Remove accumulated sediment from the floor of the vault and from the forebay This can most effectively be _ accomplished by use of a vacuum truck. 9 Once the sediments are removed, assess the condition of the vault and the condition of the connectors.The connectors t„ u are short sections of 2-inch schedule 40 PVC, or threaded - schedule 80 PVC that should protrude about 1"above the floor of the vault. Lightly wash down the vault interior r d a If desired, apply a light coating of FDA approved silicon lube to the outside of the exposed portion of the connectors.This ensures a watertight connection between the cartridge and the drainage pipe. b Replace any damaged connectors. 10 Using the vacuum truck boom, crane, or tripod, lower and install the new cartridges. Once again, take care not to damage connections. 5 Related Maintenance Activities - Material Disposal Performed on an as-needed basis The accumulated sediment found in stormwater treatment StormFilter units are often just one of many structures in a more and conveyance systems must be handled and disposed of in comprehensive stormwater drainage and treatment system accordance with regulatory protocols It is possible for sediments to contain measurable concentrations of heavy metals and in order for maintenance of the StormFilter to be successful, it organic chemicals(such as pesticides and petroleum products) is imperative that all other components be properly maintained Areas with the greatest potential for high pollutant loading The maintenance/repair of upstream facilities should be carried include industrial areas and heavily traveled roads. out prior to StorrriFilter maintenance activities. Sediments and water must be disposed of in accordance with In addition to considering upstream facilities, it is also important all applicable waste disposal regulations.When scheduling to correct any problems identified in the drainage area Drainage maintenance, consideration must be made for the disposal of area concerns may include- erosion problems, heavy oil loading, solid and liquid wastes This typically requires coordination with and discharges of inappropriate materials. a local landfill for solid waste disposal For liquid waste disposal a number of options are available including a municipal vacuum truck decant facility, local waste water treatment plant or on-site treatment and discharge 000 10 RECYCLED PAPER STa:dc'dMATER �7LtTT1CN5. 800.925 5240 contechstormwater com Support • Drawings and specifications are available at contechstormwater com • Site-specific design support is available from our engineers ©2007 CONTECH Stormwater Solutions CONTECH Construction Products Inc. provides site solutions for the civil engineering industry CONTECH's portfolio includes bridges, drainage, sanitary sewer, stormwater and earth stabilization products. For information on other CONTECH division offerings, visit contech-cpi com or call 800.338 1122 Nothing in this catalog should be construed as an expressed warranty or an implied warranty of merchantability or fitness for any particular purpose. See the CONTECH standard quotation or acknowledgement for applicable warranties and other terms and conditions of sale I InspectionReport Date: Personnel Location System Size System Type Vault ❑ Cast-In-Place ❑ Linear Catch Basin ❑ Manhole ❑ Other ❑ Date Sediment Thickness in Forebay- Sediment Depth on Vault Floor- Structural Damage Estimated Flow from Drainage Pipes(if available) Cartridges Submerged Yes ❑ No ❑ Depth of Standing Water StormFilter Maintenance Activities(check off if done and give description) ❑ Trash and Debr:s Removal ❑ Minor Structural Repairs: ❑ Drainage P.rea Report Excessive Oil Loading Yes ❑ No ❑ Source- Sediment Accumu!aUon on Pavement Yes ❑ No ❑ Source Erosion of Landscaped Areas: Yes ❑ No ❑ Source. Items Needing Further Work: Owners should contact the local public works department and inquire about how the department disposes of their street waste residuals Other Comments: I I R v`ew the condition reports from the previous inspection visits. StormFilter Maintenance Report Date. Personnel Location. System Size: System Type Vault ❑ Cast-In-Place ❑ Linear Catch Basin ❑ Manhole ❑ Other ❑ List Safety Procedures and Equipment Used I System Observations Months in Service- Oil in Forebay Yes ❑ No ❑ Sediment Depth in Forebay Sediment Depth on Vault Floor Structural Damage: Drainage Area Report Excessive Oil Loading Yes ❑ No ❑ Source: Sediment Accumulation on Pavement: Yes I❑ No ❑ Source Erosion of Landscaped Areas: Yes ❑ No ❑ source. StormFilter Cartridge Replacement Maintenance Activities Remove Trash and Debris Yes ❑ No ❑ Details. Replace Cartridges: Yes ❑ No ❑ Details: Sediment Removed Yes ❑ No ❑ Details Quantity of Sediment Removed (estimate?) Minor Structural Repairs: Yes ❑ No ❑ Details: Residuals(debris, sediment) Disposal Methods. Notes. I I I I I EXHIBIT C i Key A=Annual(March or April preferred) M=Monthly(see schedule) S=After major storms INSPECTION CHECKLIST Maintenance Checklist for Closed Detention Systems (Pipes/Tanks) i Drainage Systems Conditions To Conditions That Frequency Feature Problem Check For Shall Exist M Storage area Plugged air One-half of the end of a vent is blocked at any point Vents free of debris and sediment (Pipe tank) vents(small with debris and sediment. Plugged vent can cause pipe that storage area to collapse, connects catch basin to storage pipe) M Debris and Accumulated sediment depth exceeds 15%of All sediment and debris removed from sediment diameter. Example: 72-inch storage tank would storage area. Contact City Public Works for require cleaning when sediment reaches depth of 10 guidance on sediment removal and disposal. inches A Joints between Any crack allowing material to leak into facility. All joints between tank/pipe sections are tank/pipe sealed. section A Tank/pipe Any part oftank/pipe is noticeable bent out of shape. Tank/pipe repaired or replaced to design. bent out of Contact a professional engineer for shape I evaluation. M'S Manhole Cover not in Cover is missing or only partially in place. Any open Manhole is closed. place manhole requires maintenance. I A LockingMechanism cannot be opened by one maintenance Mechanism opens with proper tools. mechanism not person with proper tools. Bolts into frame have less working than'/z-inch of thread(may not apply to self-locking lids) A Cover difficult I one maintenance person cannot remove lid after Cover can be removed and reinstalled by one to remove applying 80 pounds of lift Intent is to keep cover maintenance person. from sealing off access to maintenance. I A I I I Ladder rungs I Maintenance person judges that ladder is unsafe due I Ladder meets design standards and allows unsafe to missing rungs,misalignment,rust,or cracks. maintenance persons safe access. If you are unsure whether a problem exists,please contact the Jurisdiction and ask for technical assistance. Comments: I i I I I ras.z.mydocuments.valenzuela.Storm-Maint-Agmmt.doe—revised 5/6/03 Paget of 12 I