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CT 07-10; Walnut Avenue Condominiums; Water Quality Technical Report Walnut Avenue Condos; 2008-01-31
WATER QUALITY TECHNICAL REPORT WALNUT AVENUE CONDOMINIUMS City of Carlsbad - IO Prepared for: James Schmitz Baron Investment Group, LLC 1135 Camino Del Mar Del Mar, CA 92014 Prepared by: , Inc. land planning, civil engineering, surveying 5115 Avenida Encinas, Suite L Carlsbad, CA 92008-4387 (760) 931-8700 July 10, 2007 RECEIVED ^c?^^JU^" ' Revised December 10,2007 Revised January 31,2008 \ 3 20l# OF CARLSBAD W.O. 842-1131-400 DEPT TABLE OF CONTENTS I. Vicinity Map 1 II. Introduction 2 Project Description 2 III. Site Map 3 IV. Pollutants and Conditions of Concern 4 V. Establish Permanent Storm Water Best Management Practices 5 Low Impact Development (LID) and Site Design BMPs 5 Source Control BMPs 6 Treatment Control BMPs 8 VI. Maintenance 8 VII. References 8 ATTACHMENTS A. Numeric Sizing of BMPs 9 B. Storm Water Requirement Applicability Checklist 11 C. 2006 CWA Section 303(d) List 12 VICINITY MAP INTERSECTION OF CARLSBAD VILLAGE DRIVE AND CARLSBAD BOULEVARD IS\APPROX. .60 MILES FROM INTERSTATE 5. PACIFIC OCEAN VICINITYMAP N.T.S. INTRODUCTION A Water Quality Technical Report (WQTR) is required under the City of Carlsbad's storm water management requirements. The purpose of this WQTR is to describe the permanent storm water Best Management Practices (BMPs) that will be incorporated in the project to mitigate the impacts of urban runoff due to the development of Walnut Avenue Condominiums Project. This WQTR is intended to ensure the effectiveness of the BMPs through maintenance that is based on long-term planning. Project Description This Water Quality Technical Report is for the proposed Tentative Map for the Walnut Avenue Condominiums Project in the City of Carlsbad. The site is bounded by Walnut Avenue to the north, Garfield Street to the west, and Lincoln Street to the east (APN 204-131-01,02, and 03). This Project proposes the development of a 15-unit multi-family residential condominium project on 0.79 gross acre of land. Existing Condition In the existing condition, the project site consist of three lots, two of which are rough graded and undeveloped, and the other with a single-family structure (25% impervious area). Runoff in the vicinity is conveyed in street gutters of Garfield Street, Lincoln Street, and Walnut Avenue into an existing curb inlet approximately 220 feet east of project on Walnut Avenue. Developed Condition The proposed developed condition will consists of a 15-unit multi-family residential condominiums and street improvements for Walnut Avenue, Lincoln Street, and Garfield Street. The proposed on-site runoff will be captured by a series of yard drains that will discharge into a 10-foot wide by 69-foot long and 2.5-foot deep concrete detention facility on-site to reduce to effect of the increased runoff due to the development of Walnut Avenue Condominiums. A 4- inch P VC pipe at the bottom of the detention facility will allow the "first flush" stormwater runoff to be treated by a dry well stormfilter before being discharged into a curb outlet into Lincoln Street. The remaining runoff will be discharged by another 4-inch PVC pipe into a second curb outlet into Lincoln Street. Downstream runoff will then be intercepted by the previously mentioned existing curb inlet on Walnut Avenue. SITEMAP SOLUTIONS. The Stormwater Management StormFilter® Technical Design Manual Determining the number of StormFilter cartridges The number of filter cartridges that you need in your StormFilter depends on agency requirements, the amount of stormwater runoff from your site that must be treated, pollutant loading to your system, and certain site-specific characteristics. Your local jurisdictional agency usually determines the requirements for treating runoff in your area. Typically your agency will specify one of two primary design methods, a flow-based method or a volume-based method, that you should use to determine the amount of runoff that must be treated. If you do not know what the required method is in your area, contact the our Engineering Department and they will assist you. Use the flow chart below to identify the set of calculations that you should use for the design method identified by your local jurisdictional agency. Step-by-step instructions for completing these calculations can be found on the following pages. Establish agency guidelines Flow-based design method Volume-based design method Use design calculations for detention See page 32 Use design calculations for highly impervious sites See page 29 Is the StormFilter downstream of detention? Is the site highly impervious (> 70%)? Use volume-based design calculations See page 34 Use design calculations for pervious sites See page 30 ©2006 CONTECH Stormwater Solutions 27 Determining the number of cartridges for a pervious site Because of increased permeability and an increased time of concentration, a large, highly pervious site can produce the same peak flow as a smaller, more impervious site. As a result, the total volume of runoff from the pervious site exceeds the volume from the impervious site, leading to a greater pollutant mass load to the stormwater treatment system. Therefore, it is critical to assess your site characteristics and to verify that the number of cartridges in the StormFilter system will adequately handle the mass loading from your site. The following calculations include steps for designing your system to adequately treat the runoff resulting from a larger pervious site that yields the same peak flow rate as a smaller impervious site. To determine the number of StormFilter cartridges needed for a pervious site (<70% impervious): 1. Determine the peak flow rate from the water quality storm for the pervious site (Qtreat) using the approved hydrologic models established by your local agency. If there are no agency guidelines, we recommend using the Santa Barbara Urban Hydrograph Method. 2. Calculate the number of cartridges required to treat the peak water quality flow rate from the site (Nflow). Assume that O^ is 15 gpm, unless more information is available. * Nflow = Qtreat (449 9Pm/cfs / Qcar{ gpm/cart) 3. Determine the area of a hypothetical site that is 85% impervious that would produce the same peak water quality flow rate as the highly pervious site. This may require that you initially guess the area and then adjust the area through a few iterations of the hydrologic model. The time of concentration should be adjusted accordingly. 4. Determine the volume of runoff from the pervious site (Vpervious) using the hydrograph calculated in Step 1. 5. Determine the volume of runoff from the impervious site (VjmperVjOUS) using the hydrograph calculated in Step 3. 6. Calculate the adjusted number of filter cartridges required to treat the water quality flow rate (Nadj) when taking into consideration the site watershed characteristics. * Nadj = [Qtreat (449 9Pm/cfs / G^ gpm/cart)] [Vpervious / Vimpervious] Note: • Assume 0^ = 15 gpm/cart, which is the maximum flow rate that an individual cartridge can treat. In some areas or situations, cartridges with a flow rate other than 15 gpm may be required, resulting in a different Qcart value. • If the number of cartridges is not a whole number, round the number of cartridges up to the next whole number. 7. Compare the number of cartridges required when considering site watershed characteristics (Step 6) to the minimum number of cartridges required to treat the peak water quality flow rate (Step 2). Use the larger of the two numbers. 30 ©2006 CONTECH Stormwater Solutions Example of cartridge number sizing for pervious site: 1 . Determine the peak flow rate from Hie water quality storm for the pervious site (Qtreat) using the approved hydrologic models established by your focal agency, * Assume that you have a i 0-acre site that is $0% Impervious. * Assume that the local agency requires treatment of the first 1* in 24 hours and that the site has a Type 1 A Rainfall distribution . * Using the Santa Barbara Urban Hydrograph Method: - - » 15 minutes 2. Calculate the number of filter cartridges required to treat the peak water quality flow rate ! 30 cartridges 3. Using a model, determine the area of a hypothetical site with an 85% impervious surface that also has a peak flow rate of 1 cfs. * After a few iterations, a site with an equivalent 1 cfe flow rate and an 85% impervious surface has an area of 5.25 acres and a Tc of 9 minutes. 4. Determine the volume of runoff from the pervious site (Vp^y^) using the hydrograph calculated in Step 1, * Use a riinoff volume ^Vpervious) °* 30,350 ft3. 5. Determine fie volume of runoff from the impervious sife (Vjmpei^ows) us'n9 *n« hydrograph calculated in Step 3. ; s «» Use a runoff volume {Vjnt^etvious) °f 24,840 ft3. 6. Calculate the adjusted number of filter cartridges required to treat the water quality flow rate when taking into consideration the site watershed characteristics. * Na<jj = 11,0 ds (44&ipatf* /15 fpntaOISQ.ttO «3 / 24,840 ft3J 7. Compare the number of cartridges required when considering site watershed characteristics {Step 6) to the m Wmum nuhiber of cartridges required to treat fhe pea water quality flow rate (Step 2). Use the larger of the two numbers. Answer: In order for the StormFilter to adequately handle the mass loading from Ms site, 37 cartridges are required, ; ©2006 CONTECH Stormwater Solutions 31 Estimating the maximum allowable cartridge flow rate Important: The data provided on this page is for system sizing purposes only. This data should not be interpreted as a statement of system performance. To estimate the maximum allowable cartridge flow rate (0^) based on site-specific TSS particle size distribution and filter efficiency (Efi|ter): 1. Determine the particle size distribution (PSD) of TSS incident to your stormwater treatment system. Note: • Because coarser particles tend to settle out in pretreatment facilities, the cartridges may treat a finer PSD than that originating from your site. • If you do not know the PSD for your site, check with your local agency. If no PSD information is available, refer to the following documents: • American Public Works Association (APWA). Protocol for the acceptance of unapproved stormwater treatment technologies for use in the Puget Sound watershed. Washington: APWA Washington Chapter, Stormwater Managers Committee. 1999. Also available online at: http:// www.mrsc.org/environment/water/water-s/apwa/protocol.htm • Portland Bureau of Environmental Services. Vendor submission guidance for evaluating stormwater treatment technologies. Portland, Oregon: City of Portland, Bureau of Environmental Services. 2001. 2. Calculate a TSS removal efficiency estimate (REE) using the equation below, the sand/silt/clay fraction derived from the PSD, and the coefficients provided in Table 3. Start by using the coefficients for a per cartridge flow rate of 15 gpm. * REE = (%Sand x Csand) + (%Silt x Csm) + (%Clay x Cday) 3. Compare the REE value to your EFi|ter value (See page 50, step 6.). • If REE > EFi|ter, 15 gpm is your allowable flow rate. • If REE < EFj|ter, repeat step 2 using the coefficients for the next lowest per cartridge flow rate, 10 gpm. 4. Repeat steps 2 and 3, reducing your flow rate each iteration, until REE > EFi|ter. Note: When REE > EFi|ter, the corresponding flow rate is your maximum allowable cartridge flow rate (Qcart). Table 3. Coefficients for Sand / Silt / Clay removal by cartridge flow rate3 Coefficients Flow Rate per cartridge (gpm) 15 10 7.5 5 csand Csilt CClay 0.90 0.75 0.10 0.93 0.75 0.10 0.96 0.80 0.15 0.99 0.85 0.30 Coefficient values are estimates based on best available data. These values may change. Contact the CONTECH Stormwater Solutions Research and Development Department for more information. 52 ©2006 CONTECH Stormwater Solutions Example of a maximum allowable cartridge flow rate estimation: 1 . Determine f>i particle si£e disf ributlbn (PSD) for the TSS being treated by your stormwater treatment system, S 2. Assume that TSS with a silt loam texture consisting of 20% sand, 65% silt, and 1 5% clay \iwllenter1ftestormwatertreatmentsystem. 3. Calculate a TSS removal efficiency estimate (REg) tor a flow rate of 1 8 gpm. * REE - (0.20 xO,90) + (0.68x0.75) + (0,15x0.10) = 0,68 4r~ Compare the R£E value to yaw Eniter value (See pap 50, step 6,) « Assume that EFi1ters 72% ! : 5. Repeat steps 3 and 4, reducing your flow rate for each iteration. 6. Assume a flow rate of 1 0 gpm. * REE = (0.20x0.93) + (0.65 x 0.75^(0.15 x 0.10) « 0.69 7. Compare the REE value to your Efrilter value (See page SO, step 6.) » REg Of 0.60 < Epjfe,. of 0.72 8. Repeat steps 2 and 3, reducing your flow rate for each iteration . 9. Assume a flow rate of 7.5 gpm. * REE m (0.20 X 0,96) + (0.65 x 0.80) •* (0,15 )C035) * 0.73 10. Compare the REg value to your Epj(ter value (See page 50, step 6.) * REg of 0.73 > Ep||ter of 0.72 Answer: Therefore, you should use alper cartridge flow rate of 7.5 gpm in order to aWeve the ; required TSS removal efficiency for the StormFHter. = ©2006 CONTECH Stormwater Solutions 53 POLLUTANTS AND CONDITIONS OF CONCERN Identify Pollutants from the Project Area - Using Table 2, identify the project's anticipated pollutants. Table 2. Anticipated and Potential Pollutants Generated by Land Use Type. Project Categorie Attached Residential Development General Pollutant Categories Sediments X Nutrients X Heavy Metals Organic Compounds Trash & Debris X Oxygen Demanding Substance P(I) Oil& Grease P(2) Bacteria & Viruses P(l) Pesticides X X = Anticipated P = potential (1) A potential pollutant if landscape exists on-site. (2) A potential pollutant if the project includes uncovered parking areas. Identify Pollutants of Concern in Receiving Waters - The project is located in the El Salto Hydrologic Sub-area (904.21), part of Carlsbad Hydrologic Unit (904.00). According to the California 2006 CWA Section 303(d) list published by the San Diego Regional Water Quality Control Board, this project discharges into Buena Vista Lagoon, Buena Vista Creek, and Pacific Ocean Shore Line, Buena Vista Creek HA which are impaired water bodies. Buena Vista Lagoon is impaired with bacteria indicators, nutrients, and sedimentation/Siltation, Buena Vista Creek is impaired with sediment toxicity, and Pacific Ocean Shore Line, Buena Vista Creek HA is impaired with bacteria indicators. Primary pollutants of concern are bacteria, sediments and nutrients Secondary pollutants of concern are trash and debris, pesticides, oxygen demanding substance, and oil and grease. Identify Conditions of Concern According to Section III.l.C of City of Carlsbad Standard Urban Storm Water Mitigation Plan, the following analysis shall be conducted and reported in the project's Water Quality Technical Report: 1) AHydrology and Hydraulic Report, dated Juty 10,2007(Revised January, 31,2008), has been developed for this project. 2) A field reconnaissance has been done for this project and no sign of downstream erosion or area of concern have been discovered. 3) Runoff characteristic for a 100-year, a 10-year and a 2-year storm frequencies have been developed as part of the Hydrology Report for this project. ESTABLISH PERMANENT STORM WATER BEST MANAGEMENT PRACTICES Projects subject to priority project requirements shall implement all applicable site design, source control, and treatment control BMPs. Storm Water BMPs requirements for this project are as follows: Low Impact Development (LID) and Site Design BMPs Maintain Pre-Development Rainfall Runoff Characteristics Control post-development peak storm runoff discharge rates and velocities to maintain or reduce pre-development downstream erosion by applying the following: 1) Minimizing impervious footprint to the maximum extent practicable consistent with the general plan, municipal code, and other City Standards: • Increase building density (number of stories above and below ground) • Construct driveways and parking lot aisles to the minimum widths required, provided that public safety and a walkable environment for pedestrians are not compromised. • Construct guest parking driveway area with permeable surface( porous pavement). • Minimize the use of impervious surfaces , such as decorative concrete, in the landscape design. 2) Conserve natural areas: • Concentrating the development into one building. • Existing drainage course is respected. Maximize the landscape areas and planter areas. 3) Minimize directly connected impervious areas: • Where landscaping is proposed, drain rooftops into adjacent landscaping prior to discharging to the storm water conveyance system. • Where landscaping is proposed, drain impervious parking lots, walkways, and patios into adjacent landscaping. 4) Maximize canopy interception and water conservation consistent with the Carlsbad landscape manual: • Plant additional native or drought tolerant trees and large shrubs in place of non-drought tolerant exotics. Protect Slopes and Channels • Not applicable to this project Source Control BMPs Design Outdoor Material Storage Areas to Reduce Pollution Introduction • Not Applicable, No outdoor storage area Design Trash Storage Areas to Reduce Pollution Introduction Trash storage areas shall be: • Paved with an impervious surface, designed not to allow run-on from adjoining areas, screened or walled to prevent off-site transport of trash; and contain attached lids on all trash containers that exclude rain; or contain a roof or awning to minimize direct precipitation. Use Efficient Irrigation Systems & Landscape Design • Employ rain shutoff devices to prevent irrigation during precipitation consistent with the Carlsbad Landscape Manual. • Design irrigation systems to each landscape area's specific water requirements consistent with the Carlsbad Landscape Manual. Provide Storm Water Conveyance System Stenciling and Signage Provide concrete stamping, porcelain tile, insert permanent marking or equivalent as approved by the City of Carlsbad, of all storm water conveyance system inlets and catch basins within the project area with prohibitive language (e.g, "No Dumping-1 live Downstream"), satisfactory to the City Engineer. BMPs Applicable to Individual Priority Project Categories Where identified in Table 1 of City of Carlsbad Standard Urban Storm Water Mitigation Plan, the following requirements shall be incorporated into applicable priority projects. Projects shall adhere to each of the individual priority project category requirements that apply to the project. a. Private Roads • No private road is proposed for this project b. Residential Driveways & Guest Parking • Guest parking driveway area will be paved with porous pavement. c. Dock Areas • Not Applicable d. Maintenance Bays • Not Applicable e & f. Vehicle and Equipment Wash Areas • Not Applicable g. Outdoor Processing Areas • Not Applicable h. Surface Parking Areas • Not Applicable as the surface parking area for this project is less than 5000 square feet and with less than 15 parking spaces . I. Non-Retail Fueling Areas • Not Applicable j. Hillside Landscaping Not Applicable Treatment Control BMPs Priority projects shall be designed to remove pollutants of concern from the storm water conveyance system to the maximum extent practicable through the incorporation of treatment control BMPs. Treatment control BMPs must be implemented unless a waiver is granted to the project by the City Engineer based on the infeasibility of any treatment control BMP. This project proposes the use of Dry Well Stormfilter with 5 cartridges by Contech Stormwater Solutions to treat the runoff from 85th percentile storm event (intensity equals 0.2). The dry well Stormfilter provides treatment and infiltration in one structure. See the Attachment "A" for numeric sizing sections calculations, pollutant removal capacity of the storm filter, and fact sheets. See the Site Map for location of treatment control BMPs. Storm Water BMP Maintenance Applicants will enter into a maintenance agreement, satisfactory to the City Engineer, assuring all project permanent BMPs will be maintained, repaired, and replaced as necessary in perpetuity. REFERENCES Water Quality Control Plan for the San Diego Basin (9) California Regional Water Quality Control Board, San Diego Region, September 8,1994. California Stormwater BMP Handbook, January 2003. City of Carlsbad Standard Urban Storm Water Mitigation Plan, April 2003. Final Model Standard Urban Storm Water Mitigation Plan for San Diego County, Port of San Diego, and Cities in San Diego County. Revised 11/6/07. 2006 CWA Section 303(d) List of Water Quality Limited Segment, June 28, 2007. Hydrology and Hydraulic Report, prepared by Bha, Inc, July 10, 2007. ATTACHMENT "A" NUMERIC SIZING OF BMPS NUMERIC SIZING Flow-based BMPs shall be designed to mitigate (infiltrate, filter, or treat) the maximum runoff produces from a rainfall intensity of 0.2 inch of rainfall per hour for each hour of a storm event, treat the runoff from 85th percentile storm event Q=CIA C=0.95 Q=(0.95)(0.2)(0.79)=0.15cfs Determining the number of cartridges required/for treatment: # Cartridges = (0.15cfs)(449gpm/cfs)^15gpm/cartridge^=4.5 The 72-Inch Dry Well Stormfilter with 5 Cartridges will be adequate to treat the runoff from runoff from 85th percentile storm event. The dry well stormfilter is designed to treat conveyed flows or sheet flows up to 0.24 cfs, with the bypass capacity of 2.0 cfs. The dry well stormfilter & providHsgtB£ treatment and infiltration in one structure, so it can remove the pollutants ,to the maximum extent practicable, from the stormwater.re^gacdiHg^he Jtt^ Table 3. Treatment Control BMP Selection Matrix of San Diego County Final Model SUSMP. (See attached pages for this table and dry well stormfilter documents.) 10 Table 3. Treatment Control BMP Selection Matrix1d) Pollutants of Concern Coarse Sediment and Trash Pollutants that tend to associate with fine particles during treatment Pollutants that tend to be dissolved following treatment Bioretention Facilities (LID) High High Medium Settling Basins (Dry Ponds) High High Low Wet Ponds and Wetlands High High Medium Infiltration Facilities or Practices (LID) High High High Media Filters High High Low High-rate biofilters High Medium Low High-rate media filters High Medium Low Trash Racks & Hydro -dynamic Devices High Low Low Notes on Treatment Control BMP Categories All rankings are relative. Ranking of all facilities assumes proper sizing, design, and periodic maintenance. Following are general descriptions of each category. * Bioretention Facilities (infiltration planters, flow-through planters, bioretention areas, and bioretention swales). Facilities are designed to capture runoff and infiltrate slowly through soil media which also supports vegetation. Bioretention facilities, except for flow-through planters, effectively promote infiltration into native soils. In clay soils, facilities may capture excess treated runoff in an underdrain piped to the municipal storm drain system. Typical criteria: an infiltration surface area at least 4% of tributary impervious area, 6-inch average depth of top reservoir, 18- inch soil layer, 12-inch to 18-inch gravel subsurface storage layer. * Settling Basins and Wetlands (extended detention basins, "wet" basins, decorative or recreational lakes or water features also used for stormwater treatment, constructed wetlands). Facilities are designed to capture a minimum water quality volume of 80% of total runoff and detain for a minimum of 48 hours. Some wetland designs have proven effective in removing nutrients, but performance varies. Page 21 of 52FINAL MODEL SUSMP Jointly Developed by San Diego Co-Permittees 2/14/02, Approved by SDRWQCB 6/12/02, Revised 11/6/07. Infiltration Facilities or Practices (infiltration basins, infiltration trenches, dry wells, dispersal of runoff to landscape, pervious pavements). These facilities and landscape designs capture, retain, and infiltrate a minimum of 80% of runoff into the ground. Infiltration facilities are generally only feasible in permeable (Hydrologic Soil Group A or B) soils. Volume and area of infiltration facilities depends on soil permeability and safety factor used. Typical criteria: Infiltration facilities should have pretreatment to remove silt to prolong life of the facility. A 10-foot vertical separation from average seasonal groundwater depth is required. Dispersal to landscape may be accomplished in any soil type and generally requires a maximum 2:1 ratio impervious:pervious and concave topography to ensure the first 1 inch of rainfall is retained. Media Filters (sand filters). Filters designed to treat runoff produced by a rainfall of 0.2 inches per hour (or 2 x 85th percentile hourly rainfall intensity) by slow infiltration through sand or other media. Typical criteria: Surface loading rate not to exceed 5 inches/hour. Entire surface of the sand must be accessible for maintenance. High Rate Biofilters (tree wells, typically proprietary). Biofilters with specially designed media to rapidly filter runoff while removing some pollutants. Filterra® (proprietary version) recommends surface loading rates of up to 100 inches/hour. High-rate Media Filters (typically proprietary). Vaults with replaceable cartridge filters filled with inorganic media. Drainage Inserts have low effectiveness in removing pollutants that tend to associate with fine particles and have medium effectiveness in removing coarse sediment and trash. They are sometimes used to augment more effective treatment facilities and are sometimes used alone when more effective facilities have been deemed infeasible. Notes on Pollutants of Concern: In Table 3, Pollutants of Concern are grouped as gross pollutants, pollutants that tend to associate with fine particles, and pollutants that remain dissolved. Pollutant Sediment Nutrients Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Bacteria Oil & Grease Pesticides Coarse Sediment and Trash X X Pollutants that tend to associate with fine particles during treatment X X X X X X X X Pollutants that tend to be dissolved following treatment X a. Low Impact Development (LID) and Site Design BMPs Priority projects shall be designed so as to minimize directly connected impervious surfaces and to promote infiltration using LID techniques. Priority projects shall, to the Page 22 of 52FINAL MODEL SUSMP Jointly Developed by San Diego Co-Permittees 2/14/02, Approved by SDRWQCB 6/12/02, Revised 11/6/07. DryWell/Soakage StormFilter infiltration, Treatment, and Groundwater Protection One of the best ways to manage stormwater and onsite hydrology is to keep the water on the site and infiltrate the runoff, as with dry well BMPs. Also called soakage bores, dry wells are a popular way to provide infiltration. As dry well popularity grows, agencies are adopting strict pretreatment standards for new and existing dry wells to avoid potential groundwater pollution. The new DryWell StormFilter Inlet Pipe adheres to these strict standards, providing infiltration, treatment, and groundwater protection in a single structure. * Manhole Overflow The StormFilter is engineered to operate for one year before requiring maintenance (for new construction applications). In many cases this interval is even longer. Benefits of the New DryWell StormFilter • Provides the highest level of stormwater treatment prior to infiltration • Treatment and infiltration in one structure • Treatment does not increase footprint of stormwater system • Delivered fully assembled and ready to drop into place and backfill • Retrofits require no excavation - cost effective retrofit, less disruption of traffic • Fast installation Drain Hole Outlet Pipe StormFilter Cartridges (up to 3) Dry Well 072' INLET PIPE (SEE NOTES 5 * G) OPTIONAL OUTLET PIPE (SEE NOTE 5) PLAN VIEW (TOP SLAB NOT SHOWN FOR CLARITY) CONCRETE GRADE RING SPLASH GUARD PVC STANDPIPE INLET PIPE (SEE NOTES 5 * £) PERFORATED MANHOLE SECTIONS (DRYWELL) BASE SUMP AS DESIGNED BY ENGINEER OF RECORD (NOT SHOWN) 030" FRAME AND COVER (STD) (SEE NOTE 4) MANHOLE STEP (TYP) 4'-6" MIN (SEE NOTE 7) I '-9" STANDARD, MINIMUM STORMFILTER CARTRIDGE (TYP) (SEE NOTE 2) PERFORATED SUMP DEPTH PROVIDED BY ENGINEER OF RECORD SECTION VIEW This product may be protected by one or more of the following US patents: 5,322,629; 5,624,576; 5,707,527; 5,985,157; 6,027,639; 6,649,048; related foreign patents, or othe patents pending. This CAOD file is for the purpose of specifying stormwater treatment equipment to be furnished by CONTECH Stomiwater Solutions and may only be transferred to other documents exactly as provided by CONTECH Stormwater Solutions Title block Information, including the CONTECH Stormwater Solutions logo and the StormFllter Stormwater Treatment System designation and patent number, may be deleted If necessary. Revisions to any part of this CADD fie without prior coordination wtti CONTECH Stormwatar Solutions shall be considered unauthorized use of proprietary Information. STORMWATER "SOLUTIONS. contechstormwater.com THE STORMWATER MANAGEMENT STORMFILTER® 72" DRYWELL - PLAN AND SECTION VIEWS STANDARD DETAIL DRAWING DATE; 2/19/07 SCALE: NONE | FILE NAME:DWSF7-72-DTL | DRAWN: JBS | CHECKED: NDG GENERAL NOTES 1. STORMFILTER BY CONTECH STORMWATER SOLUTIONS; PORTLAND, OR. (800) 548-4667; SCARBOROUGH, ME (877) 907-8e7G; LINTHICUM, MD (666) 740-3318. 2. FILTER CARTRIDGE(S) TO BE SIPHON-ACTUATED AND SELF-CLEANING. STANDARD DETAIL SHOWS MAXIMUM NUMBER OF CARTRIDGES. ACTUAL NUMBER REQUIRED TO BE SPECIFIED ON SITE FLANS OR IN DATA TABLE BELOW. 3. PRECAST MANHOLE STRUCTURE TO BE CONSTRUCTED IN ACCORDANCE WITH ASTM C478. DETAIL REFLECTS DESIGN INTENT ONLY. ACTUAL DIMENSIONS AND CONFIGURATION OF STRUCTURE WILL BE SHOWN ON THE SUBMITTAL DRAWING. 4. STRUCTURE AND ACCESS COVERS TO MEET AA5HTO H-20 LOAD RATING. 5. STORMFILTER REQUIRES 2.3 FEET OF DROP FROM INLET TO OUTLET. IF LESS DROP IS AVAILABLE, CONTACT CONTECH STORMWATER SOLUTIONS. MINIMUM ANGLE BETWEEN INLET AND OUTLET IS 45°. 6. INLET PIPING TO BE SPECIFIED BY ENGINEER AND PROVIDED BY CONTRACTOR. 7. PROVIDE MINIMUM CLEARANCE FOR MAINTENANCE ACCESS. IF A SHALLOWER SYSTEM IS REQUIRED, CONTACT CONTECH STORMWATER SOLUTIONS FOR OTHER OPTIONS. 8. ALL STORMFILTERS REQUIRE REGULAR MAINTENANCE. REFER TO OPERATION AND MAINTENANCE GUIDELINES FOR MORE INFORMATION. 03O" FRAME AND COVER (TYF) PRECAST DRYWELL STORMFILTER DATA STRUCTURE ID WATER QUALITY FLOW RATE (cfs) PEAK; FLOW RATE (< 1 cfs) RETURN PERIOD OF PEAK,FLOW (yrs) # OF CARTRIDGES REQUIRED CARTRIDGE FLOW RATE (5 or 7.5 qpm) MEDIA TYPE (CSF, PERLITE, ZPG) RIM ELEVATION BASE SUMP DEPTH PERFORATED SUMP DEPTH FIFE DATA: INLET PIPE #1 INLET PIPE #2 OUTLET PIPE I.E. XXX.XX1 XXX.XX1 N/A ORIENTATION 180° XX° N/A MATERIAL XXX XXX N/A XXX X.XX X.XX XXX XX XX xxxxx XXX.XX1 XXX' XXX1 DIAMETER XX' XX" N/A NOTES/SPECIAL REQUIREMENTS:PIPE ORIENTATION f^Y: 90° 1 80° -\-f-)-oo 270° TOP VIEW This product may be protected by one or more of the following (IS patents: 5,322,629; 5,624,576; 5,707,527; 5,985,157; 6,027,639; 6,649,046: related foreign patents, or othe patents pending. This CADD file to for the purpose of specifying Stormwater treatment equipment to be furnished by CONTCCH Stomiwater Sokitions and may only be tranrtened td pttwr docurrwts sxactly as pfovkled by COSntCH Storrmvater Solutions Tffla block Information, excluding the CONTECH Stormwater Solutions logo and the StormFllter Stormwater Treatment System designation and patent number, may be delated If necessary. Revisions to any part of this CADD fie without prior coordination with CONTECH Stormwater Solution! shall be considered unauthorized use of proprietary Information. STORMWATER ^SOLUTIONS.. contechstormwater.com THE STORMWATER MANAGEMENT STORMFILTER® 72" DRYWELL - TOP VIEW, NOTES AND DATA STANDARD DETAIL 212 DATE: 2/19/07 | SCALE: NONE | FILE NAME:DWSF7-72-DTL I DRAWN:JBS [CHECKED:NDG Basic Operation The High Flow StormFilter design has the same basic configuration and components as the Precast StormFilter but operates on a larger scale. Volume StormFilter The Volume StormFilter is designed to meet volume-based regulations where a specific water quality volume (WQv) must be captured and treated. In addition to treatment, the structure can be sized to capture all or a portion of the WQv. Restrictor discs inside each cartridge can be used to control the discharge rate from the system. The size of the disc is calibrated to provide the design filtration rate at a live storage depth. Because of these discs (and the airlock cap with a one way vent) water can be impounded above the cartridges in the treatment bay. Structures range in size from a 48" manhole to CON/SPAN sections with a 24' x 10' cross section built to length. In many cases smaller structures are combined with outboard storage, such as pipe, to provide the WQv storage. The Volume StormFilter can be designed with or without an internal bypass. If peak flows to the system exceed the internal bypass, or external bypass is required, a high flow bypass is needed. The system can also be installed online or offline and uses a traffic-bearing lid. Basic Operation The Volume StormFilter is typically configured in one of two ways. A three bay system that incorporates internal storage for the WQv and includes: the storage bay, the filtration bay, and the outlet bay. Water first enters the storage bay (a portion of which includes dead storage) which facilitates pretreatrnent (gravity separation) and storage of the WQv. The stormwater is then directed into the filtration bay for full treatment and additional storage. The storage bay can be designed with a baffle to trap floatables, oils, and surface scum. Cartridges in the filtration bay treat the stormwater and control the discharge rate. Once in the filtration bay, the stormwater percolates horizontally through the media contained in the filter cartridges. After passing through the cartridge, treated water is directed to the outlet bay by an under-drain manifold where it is discharged through an outlet pipe. A two bay, precast vault based system similar to the Vault StormFilter where pretreatrnent and live storage are provided upstream. Providing WQv storage in an outboard storage facility such as storage pipe provides the versatility to meet most footprint and elevation requirements. Dry Well StormFilter The Dry Well StormFilter provides treatment, infiltration and groundwater protection in a single structure. The system is designed to treat conveyed flow or sheet flow from small drainages. Multiple units can be installed to treat any size site. Because it provides treatment and infiltration in a single unit, the total number of structures and the amount of pipe required for the stormwater system are reduced. The Dry Well StormFilter system is available in 48", 60" and 72-" pre-cast manhole top sections that are designed to be stacked on top of dry well infiltration risers. The StormFilter portion of the unit arrives fully assembled and ready to install, including an integrated concrete deck for the StormFilter cartridges. The system can also be retrofitted into existing 48" manhole dry wells. Basic Operation Stormwater enters the dry well unit through one or more entry pipes or channels at its top. It then percolates through the media in the StormFilter cartridge to the center tube. Treated water in the cartridge center tube is discharged to the infiltration section below, and then infiltrates into the surrounding soils through a number of small exit openings at the sides and bottom. StormFilter Media The removal of site-specific pollutants can be maximized with the variety of filtration media available. In many cases, different media types can be combined so as to target a wide spectrum of pollutants. This ability to combine and use various media types allows the system to be easily adjusted to meet ever-changing site conditions and increasingly stringent regulatory requirements. Perlite Perlite is a natural, volcanic ash, similar in composition to glass and similar in appearance to pumice. To use perlite as a filter medium, it must first go through a heating process to yield a lightweight, multicellular, expanded form. This expanded form has a coarse texture, very low-density, high surface area, and stable, inert chemistry, all of which make perlite an excellent physical filtration medium. Perlite has proven to be our media of choice for sediment and oil removal. The multicellular nature of expanded perlite is the key to its excellent ability to trap sediments and adsorb oil. The coarse texture of the expanded perlite creates a bed of material with a very high porosity, which allows perlite to have the highest sediment and oil storage capacity of all of the available media options. Zeolite The term zeolite defines a family of both natural and synthetic, hydrous aluminosilicate materials with a highly porous mineral matrix that holds light, alkali metal cations (ideally sodium ions). Zeolite has the ability to use a cation exchange reaction that removes other cations such as zinc, copper, lead, and ammonia from water. In the cation exchange reaction, the light metal cations in the zeolite matrix are displaced by the heavier metal cations, such as copper, in the water. The zeolite used in our system is clinoptilolite, which has a cation exchange capacity (CEC) of approximately 100 to 220 meq/100 g. Clinoptilolite has inert characteristics that make it an excellent metals removal media option when CSF media cannot be used. It can be combined with other media such as GAC and perlite when metals are not of exclusive concern. CSF® Leaf Media CSF Leaf Media is a patented filtration media composed of composted deciduous leaves originating from the City of Portland, Oregon. CONTECH Stormwater Solutions purchases the mature, stable, deciduous leaf compost and then processes it into an odorless, pelletized compost product with physical and chemical characteristics desirable for stormwater filtration. The patented compost process creates a material with excellent flow-through characteristics and stability in water. Not only do CSF Leaf Media consist of 100% recycled, all natural materials, but it also provides good removal of sediments and excellent removal of a wide range of toxic contaminants. CSF Leaf Media provides the multitude of beneficial water treatment properties typical of soil in a form that is compatible with the compact, modular, media-based design of the StormFilter system. In addition to the physical filtration provided by the granular nature of the CSF Leaf Media, the complex chemistry of the compost also provides chemical filtration as well. Sediment and total nutrients are removed through physical filtration. Oil, complexed metals, and anthropogenic organic contaminants such as herbicides and pesticides are removed through adsorption, the physical partitioning of organic compounds, such as pesticides, to carbon-rich materials, such as the compost. Soluble metals are removed by cation exchange, as well as by complexation of metal ions to the organic chelating agents present in compost. CSF Leaf Media is an excellent, cost- effective, all-purpose media that epitomizes the potential value of recycled materials. GAC GAC (Granular Activated Carbon) is a widely accepted water filtration media used for the removal of organic compounds. It consists of pure carbon (originating from coal or charcoal) whose micro-porous structure has been enhanced through steam or acid "activation." The high carbon content and porous nature of GAC accounts for its excellent ability to remove organic compounds through adsorption. Since adsorption is the physical partitioning of organic compounds to high carbon surfaces, the "activation" of the carbon (which creates GAC) endows it with an enormous surface area upon which adsorption can take place. In situations where anthropogenic organic contaminants are of exclusive concern, GAC media provide the highest level of stormwater treatment compared to other available media options. However, because it is not very often the case that anthropogenic organic contaminants are of exclusive concern, GAC is usually combined with another media such as perlite or zeolite for the treatment of additional contaminants. Combination of GAC with perlite constitutes the most cost-effective configuration, as the effectiveness of GAC is drastically reduced if it is coated with high concentrations of heavy oil or sediment, which can restrict access via surface pores to the interior of the GAC granules. ZPG™ (Zeolite, Perlite, GAC blend) This proprietary blend of zeolite, perlite, and granular activated carbon media is used to provide an alternative for CSF media for installations where leaf media cannot be used. Stormwater Solutions News Page 1 of 1 Home | Info by State DYO Project | News | Events | Frequently Requested Into | Careers Login / Register Corporate Information | Contact Us^^'4ykjnHej*u® 0. c, .l^iLJi^Ri s £»-»«TI Bridge Solutions CONSTmicrnoN PHODUCTS^HC. Drainage Solutions Earth Stabilization Solutions Stormwater Solutions Solutions NeWS Search by... , • Go | Advanced Search Back to News Page Ail Division News CONTECH Stormwater Solutions Inc. Introduces the DryWell StormFilter New configuration of the Stormwater Management StormFilter® provides Stormwater treatment, infiltration and groundwater protection in one structure - October 16, 2006 - West Chester, Ohio — CONTECH Stormwater Solutions, a recognized leader in the Stormwater industry, today introduced the DryWell StormFilter to its award- winning StormFilter product line. This new product provides Stormwater treatment, infiltration, and groundwater protection all in one easy-to-install structure. The DryWell StormFilter captures pollutants from Stormwater to prevent groundwater contamination and blinding of the surrounding soil, and exhibits a high level of performance for the removal of total suspended solids (TSS), soluble heavy metals, total nutrients, and oil and grease. The field-proven StormFilter has earned hundreds of standalone best management practice (BMP) approvals from regulatory agencies nationwide. Dry wells are an accepted way to provide infiltration of Stormwater to groundwater and are growing in popularity. "Many regulatory agencies are implementing strict pretreatment standards for all new dry wells, and requiring existing dry wells be retrofitted with a pretreatment device," said Jim Lenhart, Chief Technology Officer of CONTECH Stormwater Solutions. "We developed the DryWell StormFilter to meet these needs. And, just like the existing StormFilter product line, it adheres to the rigorous standards that many regulatory agencies demand." This new technology is designed to treat conveyed flow or sheet flow up to 0.24 cfs. Engineered to simplify site design by providing treatment and infiltration in one structure, the DryWell StormFilter can reduce the total number of structures and the amount of pipe required for a site's Stormwater management system. This lowers the associated design, capital and installation costs. Large areas can be treated by installing multiple units. The DryWell StormFilter system is available in 48-, 60- and 72-inch pre-cast manhole top sections that are designed to be stacked on dry well infiltration risers. This unit arrives fully assembled and ready to install, including an integrated concrete deck for the StormFilter cartridges. The system can also be retrofitted into existing 48-inch manhole dry wells. Installation is completed in three easy steps, and typically takes four to six hours. © 2008 CONTECH Construction Products, Inc. Our Brands Site Map Legal Disclaimer/Privacy All rights reserved. http://www.contech-cpi.com/news/NewsDetail.aspx?release_id=l 82 1/24/2008 STORMWATER 'SOLUTIONS INC. This table's purpose is to provide expected removal capabilities for the Stormwater Management StormFilter®. The StormFilter is a passive siphon-actuated, flow-through, stormwater filtration system consisting of a structure that houses rechargeable, media-filled filter cartridges. The StormFilter works by passing stormwater through the media- filled cartridges, which trap particulates and adsorb pollutants such as dissolved metals, nutrients, and hydrocarbons. Pollutant Sediment Nutrients Metals Trash and Debris Oil and Grease Oxygen Demand Pesticides Bacteria StormFilter H1 M M H M M2 M3 M4 H = >75% expected removal efficiency for typical urban stormwater runoff M = 75% to 25% expected removal efficiency for typical urban stormwater runoff L = <25% expected removal efficiency for typical urban stormwater runoff Notes: (1) Sediment removal is dependent on particle size distribution (i.e. 55% sand, 40% silt, 5% clay-U.S.DA). (2) The StormFilter's optional drain-down system reduces degradation of captured organic matter thereby decreasing biochemical oxygen demand. (3) A media combination of Perlite/Granulated Activated Carbon is required to achieve "M". (4) Limited data exists to support removal of bacteria by the StormFilter. However, removal of bacteria appears to correspond to removal of sediment. Since the StormFilter is highly effective for removal of sediment, it follows that it is effective for removal of bacteria. 12021-B NE Airport Way, Portland OR 97220 Toll-free: 800.548.4667 Fax: 800.561.1271 BMP Fact Sheet Filtration Cartridge/Canister Page 1 of 2 Description: The StormFilter™ is a combination of a small water quality inlet (baffle system) with a varying number of float-actuated canister filters. Filter media can vary. High flow bypass spills over the baffle in the first chamber. Pictured at right is the catch basin version of the StormFilter™. Constituent Removal: Constituent Group Total Suspended Solids Total Nitrogen Total Phosphorus Pesticides Total Metals Dissolved Metals Microbiological Litter BOD TDS Removal Efficiency N.A. o o o Level-of- Confidence o o o Notes: Performance varies with media. Scores are based on average results for the media best suited for the constituent. Field data supersedes laboratory data. • Litter removal based on professional judgment. • Microbiological based on test of old model at Kearny Mesa. ( See page C-23) • ZPG media at 7.5 gpm at two locations 82% TSS at two locations (Contech, 2004) No TDS removal,49% Cu, 52% Zn, 38% diss Cu, 26% diss Zn, 49% total N (Contech, 2005) • ZPG media at 15 gpm: 46% TSS (NSF, 2004) • CSF media at 7.5 gpm and 3 storms: 87% TSS, 61% total Zn, 46% phosphorus (Contech, 2003) • Perlite media at 15 gpm: 80% TSS, 60% Cu, 73% Pb, 46% Zn, Inconclusive phosphorus removal (Contech, 2006) Source: www.contech-cpi.com/stormwater/products Key Design Elements: 1. Proprietary design 2. High flow bypass 3. Media type 4. Flow Restriction (7.5 gpm or 15 gpm) Cost Effectiveness Relative to Detention Basins: Cost Effectiveness a Level-of- Confidence O Benefit -t> Cost b Benefit 4> Cost 4> Benefit Cost - Benefit "!•• Cost -t* w O High Medium Low Rating Key for Constituent Removal Efficiency and Level- of-Confidence Rating Key for Cost Effectiveness Relative to Detention Basins Caltrans Treatment BMP Technology Report April 2007 B-135 BMP Fact Sheet Filtration - Cartridge/Canister Page 2 of 2 StormFilter Issues and Concerns: Maintenance: * Requirements: Inspecting the facility, removing litter and sediment and all spent filter cartridges, repairing or replacing inoperative controls, valve or filter canister, and cleaning the filter cartridges and canister if necessary. " Nuisance Control: Standing water requires vector monitoring. • Special Training/Equipment: Crews must be trained to repair or replace any cartridge filter or part associated with the facility or contract for maintenance. Project Development: • Right- of-Way Requirements: Space requirements depend on sizing criteria, typically smaller than basins. • Siting Constraints: Must have sufficient hydraulic head. • Construction: No unique requirements identified. Advantages: • Smaller footprint than for conventional sedimentation/gravity sand filters. • Noling, et al, report toxicity reduction for high levels of influent metals. Constraints: • Removal of fine sediment in cartridge filters is not as effective as in open bed media filters. • Vector concerns. Design, Construction, Maintenance and Cost Sources: • Contech® Stormwater Solutions, Inc., www. contech-cpi. com/stormwater/produc ts • U.S. Environmental Protection Agency, www.epa.gov/regionl/assistance/ceitts/stormwater/t echs/stormfilter.html Performance Demonstration Sources: http://www.contech-cpi.com/stormwater/case_studies/56 • Contech Storm Water Solutions 2003. "Heritage Marketplace Field Evaluation: Stormwater Management StormFilter with CSF Leaf Media." (available by request of manufacturer) • Contech Storm Water Solutions 2004. "Performance of the Stormwater Management StormFilter relative to Ecology Performance Goals for Basin Treatment" (available by request of manufacturer) • Contech Storm Water Solutions 2005. "heritage Marketplace Field Evaluation: Stormwater Management StormFilter with ZPG™ Media" (available by request of manufacturer) • Contech Storm Water Solutions 2006. "Greenville Yards Storm water Treatment System Field Evaluation: Storm water Management Storm Filter with Perlite Media at 57L/min/cart" (available by request of manufacturer) • Noling Calvin and Kellems Barry. "Successful Demonstration of the Storm water management StormFilter® Enhanced Filtration System for Toxicity Reduction of shipyard Storm water conducted at National Steel and Shipbuilding Company (NASSCO)" Presented at: the Prevention of Pollution from Ships, Shipyards, Drydocks, Ports, and Harbors: 3rd International Symposium on November 5-7,2003 at the University of New Orleans, LA http://www.hartcrowser.com/PDFs/StonTifilter.pdf • NSF International July, 2004. "Environmental Technology Verification Report: Storm water Source Area Treatment Device, the Storm water Management StormFilter® using ZPG Filter Media." www.epa.gov/etv/pdfs/vrvs/600etv06039/600etv060 39s.pdf B-136 Caltrans Treatment BMP Technology Report April 2007 STORMWAlfR 'SOLUTIONS, StormFilter Inspection and Maintenance Procedures The Sl»"r*W3**r MutViq/tment StormFilter Maintenance Guidelines The primary purpose of the Stormwater Management StormFilter® is to filter out and prevent pollutants from entering our waterways. Like any effective filtration system, periodically these pollutants must be removed to restore the StormFiiter to its full efficiency and effectiveness. Maintenance requirements and frequency are dependent on the pollutant load characteristics of each site. Maintenance activities may be required in the event of a chemical spill or due to excessive sediment loading from site erosion or extreme storms. It is a good practice to inspect the system after major storm events. Maintenance Procedures Although there are likely many effective maintenance options, we believe the following procedure is efficient and can be implemented using common equipment and existing maintenance protocols. A two step procedure is recommended as follows: 1. Inspection Inspection of the vault interior to determine the need for maintenance. 2. Maintenance Cartridge replacement Sediment removal Inspection and Maintenance Timing At least one scheduled inspection should take place per year with maintenance following as warranted. First, an inspection should be done before the winter season. During the inspection the need for maintenance should be determined and, if disposal during maintenance will be required, samples of the accumulated sediments and media should be obtained. Second, if warranted, a maintenance (replacement of the filter cartridges and removal of accumulated sediments) should be performed during periods of dry weather. In addition to these two activities, it is important to check the condition of the StormFilter unit after major storms for potential damage caused by high flows and for high sediment accumulation that may be caused by localized erosion in the drainage area. It may be necessary to adjust the inspection/ maintenance schedule depending on the actual operating conditions encountered by the system. In general, inspection activities can be conducted at anytime, and maintenance should occur, if warranted, in late summer to early fall when flows into the system are not likely to be present. Maintenance Frequency The primary factor controlling timing of maintenance of the StormFilter is sediment loading. A properly functioning system will remove solids from water by trapping particulates in the porous structure of the filter media inside the cartridges. The flow through the system will naturally decrease as more and more particulates are trapped. Eventually the flow through the cartridges will be low enough to require replacement. It may be possible to extend the usable span of the cartridges by removing sediment from upstream trapping devices on a routine as-needed basis in order to prevent material from being re-suspended and discharged to the StormFilter treatment system. Site conditions greatly influence maintenance requirements. StormFilter units located in areas with erosion or active construction may need to be inspected and maintained more often than those with fully stabilized surface conditions. The maintenance frequency may be adjusted as additional monitoring information becomes available during the inspection program. Areas that develop known problems should be inspected more frequently than areas that demonstrate no problems, particularly after major storms. Ultimately, inspection and maintenance activities should be scheduled based on the historic records and characteristics of an individual StormFilter system or site. It is recommended that the site owner develop a database to properly manage StormFilter inspection and 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 As needed, based on results of inspection (The average maintenance lifecyde is approximately 1-3 years) Per Regulatory requirement In the event of a chemical spill Frequencies should be updated as required. The recommended initial frequency for inspection is one time per year. StormFilter units should be inspected after major storms. I I I I I I I I I I I I I I I I I I I Sediment removal and cartridge replacement on an as needed basis is recommended unless site conditions warrant. Once an understanding of site characteristics has been established, maintenance may not be needed for one to three years, but inspection is warranted and recommended annually. Inspection Procedures The primary goal of an inspection is to assess the condition of the cartridges relative to the level of visual sediment loading as it relates to decreased treatment capacity. It may be desirable to conduct this inspection during a storm to observe the relative flow through the filter cartridges. If the submerged cartridges 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. 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 notes concerning defects/problems. 3. Open the access portals to the vault and allow the system vent. 4. Without entering the vault, visually inspect the inside of the unit, and note accumulations of liquids and solids. 5. Be sure to record the level of sediment build-up on the floor of the vault, in the forebay, and on top of the cartridges. If flow is occurring, note the flow of water per drainage pipe. Record all observations. Digital pictures are valuable for historical documentation. 6. Close and fasten the access portals. 7. Remove safety equipment. 8. If appropriate, make notes about the local drainage area relative to ongoing construction, erosion problems, or high loading of other materials to the system. 9. Discuss conditions that suggest maintenance and make decision as to weather or not maintenance is needed. Maintenance Decision Tree The need for maintenance is typically based on results of the inspection. The following Maintenance Decision Tree should be used as a general guide. (Other factors, such as Regulatory Requirements, may need to be considered) 1. Sediment loading on the vault floor. a. If >4" of accumulated sediment, maintenance is required. 2. Sediment loading on top of the cartridge. a. If >1/4" of accumulation, maintenance is required. 3. Submerged cartridges. a. If >4" of static water in the cartridge bay for more that 24 hours after end of rain event, maintenance is required. 4. Plugged media. a. If pore space between media granules is absent, maintenance is required. 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 cartridges), maintenance is required. 6. Hazardous material release. a. If hazardous material release (automotive fluids or other) is reported, maintenance is required. 7. Pronounced scum line. a. If pronounced scum line (say > 1/4" thick) is present above top cap, maintenance is required. 8. Calendar Lifecycle. a. If system has not been maintained for 3 years maintenance is required. Assumptions • No rainfall for 24 hours or more • No upstream detention (at least not draining into StormFilter) • Structure is online • Outlet pipe is clear of obstruction • Construction bypass is plugged Maintenance Depending on the configuration of the particular system, maintenance personnel will be required to enter the vault to perform the maintenance. 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 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: 1. If applicable, set up safety equipment to protect maintenance personnel and pedestrians from site hazards. 2. Visually inspect the external condition of the unit and take notes concerning defects/problems. 3. Open the doors (access portals) to the vault and allow the system to vent. 4. Without entering the vault, give the inside of the unit, including components, a general condition inspection. 5. Make notes about the external and internal condition of the vault. Give particular attention to recording the level of sediment build-up on the floor of the vault, in the forebay, and on top of the internal components. 6. Using appropriate equipment offload the replacement cartridges (up to 1 50 Ibs. each) and set aside. 7. Remove used cartridges from the vault using one of the following methods: Method 1: A. This activity will require that maintenance personnel enter the vault to remove the cartridges from the under drain manifold and place them under the vault opening for lifting (removal). Unscrew (counterclockwise rotations) each filter cartridge from the underdrain connector. Roll the loose cartridge, on edge, to a convenient spot beneath the vault access. Using appropriate hoisting equipment, attach a cable from the boom, crane, or tripod to the loose cartridge. Contact CONTECH Stormwater Solutions for suggested attachment devices. Important: Note that cartridges containing leaf media (CSF) do not require unscrewing from their connectors. Take care not to damage the manifold connectors. This connector should remain installed in the manifold and could be capped during the maintenance activity to prevent sediments from entering the underdrain manifold. B. Remove the used cartridges (up to 250 Ibs. each) from the vault. Important: Care must be used to avoid damaging the cartridges during removal and installation. The cost of repairing components damaged during maintenance will be the responsibility of the owner unless CONTECH Stormwater Solutions performs the maintenance activities and damage is not related to discharges to the system. C. Set the used cartridge aside or load onto the hauling truck. D. Continue steps a through c until all cartridges have been removed. Method 2: A. Enter the vault using appropriate confined space protocols. C. Unscrew the cartridge cap. Remove the cartridge hood screws (3) hood and float. D. At location under structure access, tip the cartridge on its side. I I I I I I I I I I I I I I I I I I I Important: Note that cartridges containing media other than the leaf media require unscrewing from their threaded connectors. Take care not to damage the manifold connectors. This connector should remain installed in the manifold and capped if necessary. 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 removed. 11. Close and fasten the door. 12. Remove safety equipment. 13. Finally, dispose of the accumulated materials in accordance with applicable regulations. Make arrangements to return the used empty cartridges to CONTECH Stormwater Solutions. 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 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. 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. Related Maintenance Activities - Performed on an as-needed basis StormFilter units are often just one of many structures in a more comprehensive stormwater drainage and treatment system. In order for maintenance of the StormFilter to be successful, it is imperative that all other components be properly maintained. The maintenance/repair of upstream facilities should be carried out prior to StormFilter maintenance activities. In addition to considering upstream facilities, it is also important to correct any problems identified in the drainage area. Drainage area concerns may include: erosion problems, heavy oil loading, and discharges of inappropriate materials. Material Disposal The accumulated sediment found in stormwater treatment and conveyance systems must be handled and disposed of in accordance with regulatory protocols. It is possible for sediments to contain measurable concentrations of heavy metals and organic chemicals (such as pesticides and petroleum products). Areas with the greatest potential for high pollutant loading include industrial areas and heavily traveled roads. Sediments and water must be disposed of in accordance with all applicable waste disposal regulations. When scheduling maintenance, consideration must be made for the disposal of solid and liquid wastes. This typically requires coordination with 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. 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 Q Sediment Thickness in Forebay: Sediment Depth on Vault Floor: Structural Damage: Cast-ln-Place Linear Catch Basin I |Manhole ED Other Date: Estimated Flow from Drainage Pipes (if available): Cartridges Submerged: Yes | | No F] Depth of Standing Water:. StormFilter Maintenance Activities (check off if done and give description) Q Trash and Debris Removal: Q Minor Structural Repairs: Q Drainage Area Report Excessive Oil Loading: Yes j | No | | Sediment Accumulation on Pavement: Yes Erosion of Landscaped Areas: Yes Items Needing Further Work: No j | Source: No 1 I Source: 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. Date: Location:. StormFilter Maintenance Report .Personnel: .System Size: System Type: Vault Q Cast-ln-Place List Safety Procedures and Equipment Used: Linear Catch Basin I I Manhole I I Other System Observations Months in Service: Oil in Forebay: Sediment Depth in Forebay:. Sediment Depth on Vault Floor: Structural Damage: Yes No Drainage Area Report Excessive Oil Loading: Yes | | No HH Source: Sediment Accumulation on Pavement: Yes [ j No Q] Source: Erosion of Landscaped Areas: Yes Q No Q] Source: StormFilter Cartridge Replacement Maintenance Activities Remove Trash and Debris: Replace Cartridges: Yes Q Sediment Removed: Yes | [ Quantity of Sediment Removed (estimate?): Minor Structural Repairs: Yes | [ Residuals (debris, sediment) Disposal Methods: Notes: Yes D No D Details: No Q Details: No PI Details: No Details: ATTACHMENT "B" STORM WATER REQUIREMENTS APPLICABILITY CHECKLIST 11 STORM WATER REQUIREMENTS APPLICABILITY CHECKLIST Project Address Assessors Parcel Number(s): Garfield and Lincoln St. at Walnut Ave 204-131 -01,02,03 Project # (city use only): Complete Sections 1 and 2 of the following checklist to determine your project's permanent and construction storm water best management practices requirements. This form must be completed and submitted with your permit application. Section 1. Permanent Storm Water BMP Requirements: If any answers to Part A are answered "Yes," your project is subject to the "Priority Project Permanent Storm Water BMP Requirements," and "Standard Permanent Storm Water BMP Requirements" in Section III, "Permanent Storm Water BMP Selection Procedure" in the Storm Water Standards manual. If all answers to Part A are "No," and any answers to Part B are "Yes," your project is only subject to the "Standard Permanent Storm Water BMP Requirements". If every question in Part A and B is answered "No," your project is exempt from permanent storm water requirements. Part A: Determine Priority Project Permanent Storm Water BMP Requirements. Does the project meet the definition of one or more of the priority project categories?* 1. Detached residential development of 10 or more units. 2. Attached residential development of 10 or more units. 3. Commercial development greater than 100,000 square feet. 4. Automotive repair shop. 5. Restaurant. 6. Steep hillside development greater than 5,000 square feet. 7. Project discharging to receiving waters within Environmentally Sensitive Areas. 2 8. Parking lots greater than or equal to 5,000 ft or with at least 15 parking spaces, and potentially exposed to urban runoff. 9. Streets, roads, highways, and freeways which would create a new paved surface that is 5,000 square feet or greater Yes / No / / / / / / / / * Refer to the definitions section in the Storm Water Standards for expanded definitions of the priority project categories. Limited Exclusion: Trenching and resurfacing work associated with utility projects are not considered priority projects. Parking lots, buildings and other structures associated with utility projects are priority projects if one or more of the criteria in Part A is met. If all answers to Part A are "No", continue to Part B. Part B: Determine Standard Permanent Storm Water Requirements. Does the project propose: 1. New impervious areas, such as rooftops, roads, parking lots, driveways, paths and sidewalks? 2. New pervious landscape areas and irrigation systems? 3. Permanent structures within 100 feet of any natural water body? 4. Trash storage areas? 5. Liquid or solid material loading and unloading areas? 6. Vehicle or equipment fueling, washing, or maintenance areas? 7. Require a General NPDES Permit for Storm Water Discharges Associated with Industrial Activities (Except construction)?* 8. Commercial or industrial waste handling or storage, excluding typical office or household waste? 9. Any grading or ground disturbance during construction? 10. Any new storm drains, or alteration to existing storm drains? Yes / / / / / No / / / / / *To find out if your project is required to obtain an individual General NPDES Permit for Storm Water Discharges Associated with Industrial Activities, visit the State Water Resources Control Board web site at, www.swrcb.ca.gov/stormwtr/industrial.html Section 2. Construction Storm Water BMP Requirements: If the answer to question 1 of Part C is answered "Yes," your project is subject to Section IV, "Construction Storm Water BMP Performance Standards," and must prepare a Storm Water Pollution Prevention Plan (SWPPP). If the answer to question 1 is "No," but the answer to any of the remaining questions is "Yes," your project is subject to Section IV, "Construction Storm Water BMP Performance Standards," and must prepare a Water Pollution Control Plan (WPCP). If every question in Part C is answered "No," your project is exempt from any construction storm water BMP requirements. If any of the answers to the questions in Part C are "Yes," complete the construction site prioritization in Part D, below. Part C: Determine Construction Phase Storm Water Requirements. Would the project meet any of these criteria during construction? 1 . Is the project subject to California's statewide General NPDES Permit for Storm Water Discharges Associated With Construction Activities? 2. Does the project propose grading or soil disturbance? 3. Would storm water or urban runoff have the potential to contact any portion of the construction area, including washing and staging areas? 4. Would the project use any construction materials that could negatively affect water quality if discharged from the site (such as, paints, solvents, concrete, and stucco)? Yes / / / No / Part D: Determine Construction Site Priority In accordance with the Municipal Permit, each construction site with construction storm water BMP requirements must be designated with a priority: high, medium or low. This prioritization must be completed with this form, noted on the plans, and included in the SWPPP or WPCP. Indicate the project's priority in one of the check boxes using the criteria below, and existing and surrounding conditions of the project, the type of activities necessary to complete the construction and any other extenuating circumstances that may pose a threat to water quality. The City reserves the right to adjust the priority of the projects both before and during construction. [Note: The construction priority does NOT change construction BMP requirements that apply to projects; all construction BMP requirements must be identified on a case-by-case basis. The construction priority does affect the frequency of inspections that will be conducted by City staff. See Section IV.1 for more details on construction BMP requirements.] | \A) High Priority 1) Projects where the site is 50 acres or more and grading will occur during the rainy season 2) Projects 1 acre or more. 3) Projects 1 acre or more within or directly adjacent to or discharging directly to a coastal lagoon or other receiving water within an environmentally sensitive area 4) Projects, active or inactive, adjacent or tributary to sensitive water bodies B) Medium Priority 5) Capital Improvement Projects where grading occurs, however a Storm Water Pollution Prevention Plan (SWPPP) is not required under the State General Construction Permit (i.e., water and sewer replacement projects, intersection and street re-alignments, widening, comfort stations, etc.) 6) Permit projects in the public right-of-way where grading occurs, such as installation of sidewalk, substantial retaining walls, curb and gutter for an entire street frontage, etc. , however SWPPPs are not required. 7) Permit projects on private property where grading permits are required, however, Notice Of Intents (NOIs) and SWPPPs are not required. | \C) Low Priority 8) Capital Projects where minimal to no grading occurs, such as signal light and loop installations, street light installations, etc. 9) Permit projects in the public right-of-way where minimal to no grading occurs, such as pedestrian ramps, driveway additions, small retaining walls, etc. 10) Permit projects on private property where grading permits are not required, such as small retaining walls, single-family homes, small tenant improvements, etc. Owner/Agent/Engineer Name (Please Print): AFSHIN HOMAYOONMEHR Signature: s£<^£"—- -- _ Title: ASSISTANT ENGINEER Date: *M2f/2oo$ ATTACHMENT "C" 2006 CWA SECTION 303 (D) LIST 12 1 s r^ g J ^S s * ig 1z «NH 0* G4 ^R •<3 a,& !sPN H Z g O C/5 a [MIXEDNTROL BOARH ohJ u ^ H H ^3 »•< a & H(**V •"* ^^^ J^.02 ^ [j^ z FH 2 ^ ^ O S 1 § 3 O Z 0 HU E*^t/5 ^^u 0o I lz o ^w ^oa gO is §8 li 1 1 oS 63M C3 CO den s8 KOm 1 §gz Hi |1t| §i is 1 Ov W S o •c 15 ^1 So §i 1 3 ^ M^^ ^-i o> ri 3 °'C0 c S ^ .0 -C c1 -S •S w "3 i |||sS *• f \- Ifs 1 2 | | c | I 1 tn I & £ S •- .5^a 1 z & |1=35 1 6 1 rr1 •> C ® ® *Jo*i! =^ .^ fc- B B Oo ^ S D 3 Z If ^ § .|^ § ^ « 0 t' '« Or k. m C \J £ >-. ^ 5 o:l -s f s ^^ 1 1 8 2- oE 1 !J .i ^ w - OV»H O OvVH O 8 I e II c o B OI I Bi I S Z o S a. .ag "Sen InA o § NsOs Ua I 3 9M DLSDAT£»!m S "i S 1 £ 1 o\ O o C/5 g R I(3 §H - II^ ohH U 1 sj Bri s D0to 'B I.= 1c 2 10to 'B I_B Z O| 1 S I E'So. 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