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Specifications KEYWAY OFFICE TABLE OF CONTENTS I. Project Overview II. Water Quality Design III. Conveyance Pipe Design and Diagram IV. Downstream Analysis V. Details VI. Operations and Maintenance Storm Filters and Catchbasins 1 KEYWAY OFFICE I. Project Overview KEYWAY OFFIC F Project Overview The Keyway Office project is located at 7275 Hermoso Way in Tigard, Oregon. The project will include a new parking lot and a water quality facility. The existing site consists of fairly flat terrain with(2) existing buildings and two trees. The existing buildings footprints (house and shed), combined are approximately 2,669SF and the existing impervious paving is 747SF. The total additional proposed impervious area for the site is 1,084SF. The total site area is 14,500SF, with 4,500SF being impervious after construction. The water quality facility required for this project will be designed according to the requirements outlined in the"Design and Construction Standards for Sanitary Sewer and Surface Water Management"by Clean Water Services, dated June 2007. The stormwater quality will be accomplished using a mechanical device. Contech Stormwater Solutions builds the device specified for this project. The water quality treatment capacity for this device was accomplished using 0.36in over a 4-hour period over the post-development impervious parking area. After the mechanical water quality device,the storm water from the lot will be released to a weep hole in the curb on Hermoso Way. 0.463D 73 S Conveyance pipe sizing was performed using Manning's Equation (Q = n ), where D is pipe diameter in feet, S is pipe slope in feet/feet, and n is the Manning's Coefficient and is based on the pipe material. A value of 0.013 (concrete) was used for this project and is conservative if PVC piping is utilized for the project. Design storm rainfall distributions for the required design events were determined using the rainfall data in Appendix B,Drawing 1280 in R&O 07-20 Please see the attached calculations showing that the on-site stormwater system meets the said requirement. KEYWAY OFFICE II. Water Quality Design KEYWAY OFFICE Water Quality Design Water quality was calculated for this site using a total of 0.36 inches falling within a 4- hour period over 100% of the new impervious parking area (1,831SF). The Contech Stormwater Solutions 1-Cartridge StormFilter Catch Basin treats a water quality flow(Q) up to 0.34cfs. The 1-Cartridge Catch Basin has a built-in high flow bypass capable of passing up to a 1.0cfs flow. The SFCB has in internal permanent pool elevation 2' below the rim of the catch basin. The devices will have a built in high flow bypass for the difference in the water quality flows and the high event flows, as tabulated below. Table 1 StormFilter Catch Basin Data Water Max. Max. StormFilter Standard/ Quality Treatment Peak Allowable Capacity Flowrate Catch Basin Deep Flowrate Flowrate Flowrate (cfs) (cfs) (cfs) (cfs) CB1 Standard 0.004 0.034 0.041 1.0 The Water Quality Volume is the expected stormwater runoff volume from the water quality storm. Water Quality Volume (WQV) — 0.36in.x Area 12 a/f ' t. 0.36in.x 1,831 ft.2 12 i�t. Water Quality Volume = 54.93 ft 3 The Water Quality Flow is the expected design flow from the water quality storm. Water Quality Flow (WQF) _ WQV = 54.93 ft.3 14,400 sec. 14,400 sec. Water Quality Flow (WQF) = 0.004ft sec=0.004cfs KEYWAY OFFICE Total Filter Calculations CB 1 449 gpm cfs Number of Filters, Nn0W= Qtreat Q gpm/ ua t cart. Qcart = 7.5 gpm/art. 449 gpm Now= 0.004cfs /fs =0.24 7.5 gpm/ cart., A total of 1 Contech Stormwater Solutions StormFilters will be required. KEYWAY OFFICE III. Conveyance Pipe Design and Diagram KFYWAY OFFICE Conveyance Pipe Design Conveyance pipe sizing was performed using the 25-year, 24-hour design storm (3.9 inches total depth falling in 24 hours), per Appendix B, Drawing 1280, of the Design and Construction Standards. Manning's Equation was used to model the flow within pipes. A Manning's Coefficient value of 0.013 (concrete) was used to model the pipe and is conservative if PVC piping is utilized for the project. A diagram of the conveyance system has been included for reference. Table 2 Conveyance Piping Data Pipe Pipe Size Pipe Slope Design Capacity Callout lE in IE out (in) (%) Flow Flow (cfs) (cfs) A 235.140 234.97 6" 0.3% 0.148 0.29 Please see attached calculations to verify adequacy of conveyance system. Project Name: Keyway Office Design Frequency: 25yr Designed By: NWS Date: 12/30/08 Sheet: loll Project#: A08175.11 Checked By: CNH Date: 12/30/08 . Time of Min. Capacity Velocity Total Total Time Average PI a Flow Index Runoff Equiv. Content. Design Pipe Area Drainage of Rainfall Discharge IE(in) IE(out) Length Invert Pipe Size Flowing Flowing Time Area Coeff. Area Area Or Flow Concent. Intensity g Slope Full Full Time (A) (c) (CA) (cA) (t) (T) (I) (Q) (L) (s) (D) (Q) (V) (t) acres acres acres min min in/hr cfs ft ft ft % in cfs fps min CB1 0.041 0.90 0.037 0.037 5.0 5.0 3.90 0.143 235.14 234.97 64.25 0.3% 6 0.29 1.47 0.7 0.90 5.0 5.0 3.90 -.11-MINiii--� 0.90 5.0 5.0 3.90 MI - - 0.90 5.0 5.0 3.90MEI � � Ell 0,90 5.0 5.0 3.90 IIII MIN MI 11 - - 0.90� - 5.0 5.0 3^90 III 0.90 5.0 5.0 3.90 111110. MINI NM 0.90 5.0 5.0 3.90 Elli _ 0.90 5.0 ... 5.0 3.90 �� 0.90 5.0 5.0 3.90 ���--NI 0 90_..._ 5.0 5.0 3.90 0.90 5.0 _._ 5.0 3.90 Ell IIIII � .... 0.90 5.05.0_. 3.90 0.II old 90 0.90 5 0 5.0 3.90 SSIIIIIIIIIII �- 0.90 5.0 5.0 3.90 .__ ___ --�IIII E 0.90 5.0 5.0 3.90 0.90 5.0 5.0 3.90 - -LIII 0.90 5.0 5.0 3.90 � � IIIII MU ■ 0.90 5.0 5.0 3.90 Ill �� 0.90 5.0 5.0 3.90 IIIIIIIIIII. 11111 --- 0.90 5.0 5.0 3.90 -11111 _ _ _____ 1 - - 7 - _ _ _ ___T___ _ — ________ _ _ I 1 i 1 a I I TAX LOT � 1200 r I I I I � I I I i \ I I a 1 I tri(704 I wisiTei i ceo ..� .,, 0 111111, KEYWAY OFFICE IV. Downstream Analysis • KEYWAY OFFICE Downstream Analysis The on-site stormwater system will be discharged through a weep-hole in Hermoso Way. After construction we will be adding 1,084Sf of impervious area to our site. At the 25- year design storm intensity this will increase the downstream flow by 0.087cfs. Considering the existing flow generated by the roadway and sidewalks this increase is negligible. By this observation the existing downstream system has adequate capacity for the proposed additional stormwater flows. KEYWAY OFFICE V. Details B 9 2 OUTLET STUD (SEE NOTES 465)---\\\ -.� C" G ��OVERLAP WEIR WALL — r [ l_ 1N. o 4�� i.:,................. (TIT) SCUM BAFFLE ��=:•, a i S REINFORCING BARS INLET STUB (SEE NOTE G) 41 (OPTIONAL) (SEE NOTES 4E5) 1-CARTRIDGE CATCHBASIN - PLAN VIEW 1 1 RAT 4" ACCESS COVER INLET GE OPENINGG L_ r 2 1/2" . -r- I_ -_,?-_-_-_-:, -...=...... .-- \...1 CONCRETE COLLAR OUTLET STUB �� �I (SEE NOTE 6) (SEE NOTES 4E5) 1 ippil a.at STORM PI LTER r w 1111 ^ CARTRIDGE (TYP) � �� (SEE NOTE 2) CLEANOUT ACCESS PLUG ON WEIR WALL IIILI UNDERDRAIN MANIFOLD 2-4 2 INSIDE 4'-4 3/4" INSIDE OUTSIDE THE STORMWATER MANAGEMENT 1-CARTRIDGE CATCHBASIN - SECTION VIEW CNTNo ere U.S.U.5. PATENT No. 5,322,629, 1 No. 5,707,527,No.6,027.639 No.6,649,045,No. 5,624,576, AND OTHER U.S.AND FOREIGN ©2006 CONTECH Storrnwatar Solutions PATENTS PENDING A IILITr LJ STEEL CATCHBASIN STORMFILTER DRAWING %�44►�'� i �"�' ' PLAN AND SECTION VIEWS 1 STORMWATER STANDARD DETAIL - 1 CARTRIDGE UNIT -----"-SOLUTIONS_ 1/3 contechstorn,water.COm DATE:11/01/05 I SCALE NONE 1 FILE NAME:CBSFI-S-DTt. I DRAWN:MJW I CHECKED:ARG 4"0 OPENING PERMANENT POOL ELEVATION WLVARIES 2'-3 5/6" - 2'-3 5/6" MAX. 5" , • OUTLET STUB INLET STUD (SEE NOTES 4 5) 2' (OPTIONAL) INSIDE (5EE NOTES 44 5) 2"0 OUTLET PIPE I 2'-0 I/2" FROM UNDERDRAIN OUTSIDE 1-CARTRIDGE CATCHBASIN - SECTION VIEW B 2 LIFTING EYE (TYP OF 4) lj � \I PERMANENT 3,-S„ \ FOOL ELEVATION „_'II . 1 CARTRIDGE I'-6'' SUPPORT (TY?) 1 1-CARTRIDGE CATCHBASIN - SECTION VIEW 0 THE STORMWATER MANAGEMENT • StormFnter® U.S.PATENT No.5,322,629, No.5,707 527,No.6,027,639 No.6,649,045,No.5,624,576, AND OTHER U.S.AND FOREIGN 02006 CONTECH Stormwater Solutions PATENTS PENDING " V'rCAn® STEEL CATCHBASIN STORMFILTER DRAWING %V►�'1 • �'r" ' SECTION VIEWS 2 STORMWATER^' STANDARD DETAIL - 1 CARTRIDGE UNIT -"'SOLUTIONS- 2/3 contechstormweter.com DATE 11/01/05 SCALE:NONE FILE NAMt CBSFI-S-DTL I DRAWN:MJW CHECKED:ARG GENERAL NOTES ) STORMFILTER BY CONTECH STORMWATER SOLUTIONS; PORTLAND, OR.(800) 548-4667; SCARBOROUGH, ME (877) 907-8676; LINTHICUM, MD(566) 740-33 18. 2) FILTERS TO BE SIPHON-ACTUATED AND SELF-CLEANING. 3) STEEL STRUCTURE TO BE MANUFACTURED OF 1/4 INCH STEEL PLATE. 4) STORMFILTER REQUIRES 2.3 FEET OF DROP FROM RIM TO OUTLET. INLET SHOULD NOT BE LOWER.THAN OUTLET. INLET (IF APPLICABLE) AND OUTLET PIPING TO BE SPECIFIED BY ENGINEER.AND PROVIDED BY CONTRACTOR. 5) CBSF EQUIPPED WITH 4 INCH (APPROXIMATE) LONG STUBS FOR.INLET(IF APPLICABLE)AND OUTLET PIPING. STANDARD OUTLET STUB IS 8 INCHES IN DIAMETER. MAXIMUM OUTLET STUB IS 15 INCHES IN DIAMETER. CONNECTION TO COLLECTION PIPING CAN BE MADE USING FLEXIBLE COUPLING BY CONTRACTOR. C) FOR H-20 LOAD RATING, CONCRETE COLLAR I5 REQUIRED. CONCRETE COLLAR WITH QUANTITY(2) #4 REINFORCING BARS TO BE PROVIDED BY CONTRACTOR. 7) ALL STORMFILTERS REQUIRE REGULAR MAINTENANCE. REFER TO OPERATION AND MAINTENANCE GUIDELINES FOR.MORE INFORMATION, I -CARTRIDGE CATChlt3A5IN 5TORMFILTER DATA STRUCTURE ID CBI WATER QUALITY FLOW RATE (cfs) 0.004cfs PEAK FLOW RATE (<I cfs) 0.040cfs RETURN PERIOD OF PEAK FLOW(yrs) 25yrs CARTRIDGE FLOW RATE (I 5 OR.7.5 opm) 7.5gpm MEDIA TYPE (CSF, PERLITE, ZPG) PERLITE RIM ELEVATION 237.44' PIPE DATA: I.E. DIAMETER INLET STUB OUTLET STUB 235. 1 4_ G" CONFIGURATIO OUTLET. OUTLET INL �■�•�I INLET \i SLOPED LID NO SOLID COVER NO NOTES/SPECIAL REQUIREMENTS: INLET GRATE ACCESS COVER 111.1.11111.11117 I IllI t ►�=� =�IIII l CIII11I0I001 INSIDE RIM 11111111111111 Or 41 2'-4" 4L 2 4 INSIDE RIM INSIDE RIM THE STORMWATERMANAGEMENT 4'-8 3/4" 5tormFdtere OUTSIDE RIM U.5. PATENT No. 5,322,629, Nc. 5,707,527, No.6,027,639 1-CARTRIDGE CATCHBASIN - TOP VIEW ® No.6,707,5 8,No. 6, 24,635 AND OTHER U.S.AND FOREIGN ©2006 CONTECH Stormwater Solutions PATENTS PENDING A \V JTr LI STEEL CATCHBASIN STORMFILTER DRAWING mitoriTOP VIEW, NOTES AND DATA 3 STORMWATER STANDARD DETAIL - 1 CARTRIDGE UNIT ""SOLUTIONS. 3/3 contechstormWate5QOf11 DATE:11/01/05 I SCALE:NONE I FILE NAME:CBSFI-S-DTL DRAWN:MJW I CHECKED:ARG KEYWAY OFFICE VI. Operations and Maintenance Storm Filters and Catchbasins A•�ii�►ITCA�J° 40• ■ Operation and Maintenance STORMWATER ��-�� SOLUTIONS. CatchBasin StormFIIterTM 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 When flows into the CBSF exceed the water similar applications. 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 pipe. the standard unit, and 1.8 cfs for the deep Applications steel and concrete units. Plastic units have 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 The retrofit market has many possible for other non-traffic-bearing applications. 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 grade,"thus reducing the high cost of re Runoff enters the sumped inlet chamber either by sheet flow from a paved surface or piping the storm system. ©2006 CONTECH Stormwater Solutions Toll-free 800.548.4667 1 of 3 contechslormwater.com CatchBasin StormFilter Operation and Maintenance Guidelines 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 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 reassembled and returned to CONTECH 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 for specifications and availability of the 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"). 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 as required. 8. Rinse interior of both bays and vactor remaining water and sediment. 9. Install fresh cartridge(s) threading clockwise to pipe manifold. 10. Replace cover and grate. 11. Return original cartridges to CONTECH Stormwater Solutions for cleaning and media disposal. ©2006 CONTECH Stormwater Solutions Toll-free:800.548.4667 2 of 3 contechstormwater.com CatchBasin StormFilter Operation and Maintenance Guidelines Mosquito Abatement Using Larvicides in the CatchBasin Storm Filter In certain areas of the United States, mosquito abatement is desirable to reduce Larvicides should be used according to the incidence of vectors. manufacturer's recommendations. • Two widely available products are Mosquito Dunks and Summit B.t.i. Briquets. For more In BMPs with standing water, which could information, visit provide mosquito breeding habitat, certain http://www.summitchemical.com/mos_ctrI/d abatement measures can be taken. efault.htm. 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 steel catch basin. thuringiensis israelensis (BTI). BTI is a bacterium toxic to mosquito and For more information on mosquito black fly larvae. abatement in stormwater BMPs, refer to the following: In some cases, the presence of petroleum http://www.ucmrp.ucdavis.edu/publications/ hydrocarbons may interrupt the mosquito managingmosquitoesstormwater8125.pdf growth cycle. ©2006 CONTECH Stormwater Solutions Toll-free:800.548.4667 3 of 3 contechstormwater.com CatchBasin StormFilter Operation and Maintenance Guidelines i► :. STORMV.�ATER��A, '-------- SOLUTIONS, . StormFilter Inspection and Maintenance Procedures E' Of a # { { v ,. P ,. 340 S tormFilter Maintenance Guidelines In addition to these two activities, it is important to check the condition of the StormFilter unit after major storms for The primary purpose of the St prevent Management potential damage caused by high flows and for high sediment StormFilter*is to filter out and prevent pollutants from entering accumulation that may be caused by localized erosion in the our waterways. Like any effective filtration system, periodically drainage area. It may be necessary to adjust the inspection/ these pollutants must be removed to restore the StormFilter to its maintenance schedule depending on the actual operating full efficiency and effectiveness. 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 A properly functioning system will remove solids from water by options, we believe the following procedure is efficient and trapping particulates in the porous structure of the filter media can be implemented using common equipment and existing inside the cartridges.The flow through the system will naturally maintenance protocols. A two step procedure is recommended decrease as more and more particulates are trapped. Eventually as follows: 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 cartridges by removing sediment from upstream trapping devices Inspection of the vault interior to determine the need for on a routine as-needed basis in order to prevent material from maintenance. being re-suspended and discharged to the StormFilter treatment 2. Maintenance system. Cartridge replacement Site conditions greatly influence maintenance requirements. Sediment removal 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 monitoring information becomes available during the inspection First,an inspection should be done before the winter season. During the inspection the need for maintenance should be program.Areas that develop known problems should be determined and, if disposal during maintenance will be required, inspected more frequently than areas that demonstrate no problems, particularly after major storms. Ultimately, inspection samples of the accumulated sediments and media should be 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 `r, As needed, based on results of inspection (The average .. . maintenance lifecycle is approximately 1-3 years) Per Regulatory requirement • s,, In the event of a chemical spill Frequencies should be updated as required.The recommended L initial frequency for inspection is one time per year. StormFilter kli‘be �" ,.,„Fs.� units should be inspected after major storms. n 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 ___ are severely plugged,then typically large amounts of sediments 4; . will he 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. j I I 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. e 1. If applicable,set up safety equipment to protect and notify a t 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 required. I' i " 2.Sediment loading on top of the cartridge. € ; f 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 p a .. p .-- that 24 hours after end of rain event, maintenance is "`� ; r required. 4.Plugged media. .. . a. If pore space between media granules is absent, n r + i1 maintenance is required. 4,k ' r.t ) 5. Bypass condition. '"" a. If inspection is conducted during an average rain fall event and StormFilter remains in bypass condition (water over the internal outlet baffle wall or submerged r 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 • No rainfall for 24 hours or more ,, i,,vo Vir. i; • No upstream detention (at least not draining into StormFilter) ,` « t•, `a • Structure is online '" ni ii • Outlet pipe is dear of obstruction • Construction bypass is plugged ti Maintenance 'I '' Depending on the configuration of the particular system, I I. i !F + maintenance personnel will be required to enter the vault to j perform the maintenance. " J 1 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 - r . occurring. 1 I i a Replacement cartridges can be delivered to the site or customers _ .a�..P . i n;,,,,,, " facility. Information concerning how to obtain the replacement +-;"'s„ 4., *i S t. :, cartridges is available from CONTECH Stormwater Solutions. } s, •• -Q' ' ._ Warning: In the case of a spill, the maintenance personnel should abort maintenance activities until the proper guidance is obtained. Notifythe 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 not 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 capped during the maintenance activity to prevent notes concerning defects/problems, 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. B. Unscrew the cartridge cap. Roll the loose cartridge, on edge,to a convenient spot 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. ail E. Set the empty, used cartridge aside or load onto the hauling truck. ' • s 'F. Continue steps a through e until all cartridges have been ! - F, t-�., removed. ;,IA, ^`fir, IY kx r;': °rilitil G i • i i 'qa. . � 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. z" 9. Once the sediments are removed, assess the condition of the vault and the condition of the connectors.The connectors . are short sections of 2-inch schedule 40 PVC,or threaded "" -w schedule 80 PVC that should protrude about 1"above the - . floor of the vault. Lightly wash down the vault interior. a. If desired, apply a light coating of FDA approved ir 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. 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 StormFilter 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. RECYCLED PAPER .., r Oir 514;4150'11.4TBR: s. 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. } Inspection Report Date: Personnel: Location: System Size: System Type: Vault r 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 Debris Removal: Minor Structural Repairs: I Drainage Area Report Excessive Oil Loading: Yes No r Source: Sediment Accumulation on Pavement: Yes Li No E Source: Erosion of Landscaped Areas: Yes E No I I 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: Review 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: System Observations Months in Service: Oil in Forebay: Yes No r 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 J 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 l Details: Sediment Removed: Yes No Details: Quantity of Sediment Removed (estimate?): Minor Structural Repairs: Yes ❑ No Details: Residuals(debris,sediment) Disposal Methods: Notes: