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HomeMy WebLinkAboutCT 06-13; Tabata 10; Tentative Map (CT) (5)STORM WATER MANAGEMENT PLAN 2311 Camino Hills Drive Carlsbad, Califorma WDID# CT 06-13 Submitted to: The City of Carlsbad Engineering Dept Prepared: July 12, 2007 Revised: 4-30-08 Revised: 8-14-08 For: Noboru & Evelyn Tabata PO Box 679 Carlsbad, CA 92018 Suiter, RCE 68964 Prepared By: Pasco Engineering 535 North Coast Highway 101, Suite A Solana Beach, CA 92075 (858) 259-8212 PE 1011 RECEIVED SEP 2 2 7008 CiTY OF CARLSBAD PLANNING DEPT TABLE OF CONTENTS PAGE 1. INTRODUCTION 1.1 Project Description 1 1.2. Hydrologic Unit Contribution 2 1.3. Beneficial Uses 2 1.3.1. Inland Surface Waters 3 1.3.2. Groundwater 3 1.4. 303(d) Status 3 2. CHARACTERIZATION OF PROJECT RUNOFF 2.1. Expected Discharges 4 2.2. Soil Characteristics 5 3. MITIGATION MEASURES TO PROTECT WATER QUALITY 3.1. Constmction BMPs 6 3.2. Post-construction BMPs 6 3.2.1. Bio Filters 7 4. OPERATION AND MAINTENANCE PROGRAM 4.1. Bio-Filters 7 5. FISCAL RESOURCES 7 ATTACHMENTS A. Beneficial Uses B. Best Management Practices Information C. Storm Water Requirements Applicability Checklist D. Numerically Sized BMP Calculations INTRODUCTION This report has been prepared based on the criteria set forth by the Regional Water Quality Control Board's Order No. 2001-07, the "Model Standard Urban Storm Water Mitigation Plan for San Diego County, Port of San Diego, and Cities in San Diego County", and the revised (March 2008) "City of Carlsbad Standard Urban Storm Water Mitigation Plan - Storm Water Standards." Based on the above criteria the proposed project is not exempt from the Stonnwater Management Plan (SWMP) requirement. This project meets 2 conditions of priority status as identified in the Storm Water Applicability Checklist found in the City of Carlsbad Standard Urban Storm Water Mitigation Plan - Storm Water Standards. The purpose of this SWMP is to address the water quality impacts from the proposed Tentative Map. Priority Best Management Practices (BMPs) as well as LID site design BMPs will be utilized to provide a long-term solution to water quality. This SWMP is also intended to ensure the effectiveness of the BMPs through proper maintenance based on long-term fiscal planning. The SWMP is subject to revisions as needed by the engineer. 1.1 Project Description The project proposes to develop the site into 26 detached single-family dwellings, although no architecture is proposed at this time. The proposed development will include public improvements along the frontage ofthe site on Camino Hills Dr., a public street, and storm drain improvements. The project proposes grading to create multi-level pads suitable for the . construction of residential structures and the construction of all underground utilities typically associated with residential development. The specific improvements along Camino Hills Dr. include the realignment of the street as well as the construction of curb, gutter, and sidewalk- The proposed public street will contain an underground storm drain system including 3 storm drains, an underground detention structure, and eight storm water filter devices by Filterra. The proposed residential lots in the development will utilize swales and channels to drain the pads to the proposed private street and ultimately to the existing storm drain system on El Camino Real adjacent to the site. To meet water quality objectives, the project proposes to treat all runoff by a series of bioswales in combination with storm water filter devices by Filterra. As previously mentioned, an underground concrete detention structure will be incorporated to detain the increased runoff generated by the project. Numerically sized permanent BMPs will be incorporated into the storm drain system design as well as additional storm filter devices to comply with LID acceptable practices. The numerically sized permanent BMPs proposed include three Filterra storm water devices and a bio-filter swale, which are intended to filter shallow concentrated storm water; thereby filtering the storm water due to its relatively slow velocity and shallow depth, and allowing suspended pollutants to settle and deposit within the swale. The proposed project site is located in sump. As a result, all runoff generated by the 100 year storm event will be captured and conveyed within the proposed storm drain system. This design includes the construction of tiiree type "F" catch basins, with a low flow piping system, 3 type "B-1" curb inlets, and all related piping. Runoff associated with the 85* percentile will be directed to flow through either the above mentioned swale or one of three Filterra storm filter devices before entering the concrete detention structure. These permanent BMP's have been numerically sized to handle the 85* percentile flow and can be found in the attachment "D" of this report. In addition to numerically sized permanent BMP's, in an effort to satisfy LID requirements, an additional five Filterra units will be used to further treat runoff generated from the site and provide more redundancy in the treatment of storm water runoff. Individual lots will also contain smaller grass swales and landscaping to further satisfy LID requirements. A BMP exhibit has been provided in the appendix of this report. Increased discharge rates will be avoided and existing discharge rates will be maintained through the use of a concrete detention structure coupled with a hydraulically designed pipe. The pipe will be sized to ensure the discharge rate after development matches that of the existing site. All excess runoff stored during large storm events is designed to drain the detention structure within 72 hours. Runoff discharged from the detention structure will be joined to an exisfing storm drain system and uhimately released through an existing 36" RCP drainpipe. 1.2 Hydrologic Unit Contribution The project is located in the Agua Hedionda hydrologic area and more specifically in the Los Monos HSA, Carlsbad Hydrologic Unit (904.31). The project area is characterized by rolling grassy hills and shrubs. The proposed project will not significantly alter drainage pattems on the site. The storm water discharge points will not significantly divert runoff from existing conditions. The time required for runoff to reach discharge points will not significantly change nor will the final flow volumes. 1.3 BeneOcial Uses The beneficial uses for hydrologic basin no. 904.31 are included in Attachment "B". These tables have been extracted from the Water Quality Control Plan for the San Diego Basin. MUN - Municipal and Domestic Supply: Includes uses of water for community, military, or individual water supply systems including, but not limited to, drinking water supply. AGR - Agricultural Supply: Includes uses of water for farming, horticulture, or ranching including, but not limited to, irrigafion, stock watering, or support of vegetation for range grazing. IND - Industrial Services Supply: Includes uses of water for industrial acfivities that do not depend primarily on water quality including, but not limited to, mining, cooling water supply, hydraulic conveyance, gravel washing, fire protection, or oil well re-pressurization. MAR - Marine Habitat: Includes uses of water that support marine ecosystems including, but not limited to, preservation or enhancement of marine habitats, vegetation such as kelp, fish, shellfish, or wildlife (e.g. marine mammals or shorebirds). RECI - Contact Recreation: Includes uses of water for recreafional activities involving body contact with water, where ingestion of water is reasonably possible. These uses include, but are not limited to, swimming, wading, water-skiing, skin and SCUBA diving, surfing, white water activities, fishing, or use of natural hot springs. REC2 - Non-Contact Recreation: Includes the uses of water for recreational involving proximity to water, but not normally involving body contact with water, where ingestion of water is reasonably possible. These uses include, but are not limited to, picnicking, sunbathing, hiking, camping, boating, tide pool and marine life study, himting, sightseeing, or aesthetic enjoyment in conjunction with the above activities. AQUA - Aquaculture: Includes uses of water for aquaculture or mariculture operations including, but not limited to, propagafion, cultivation, maintenance, or harvesting of aquatic plants and animals for human consumption or bait purposes. COMM - Commercial & Sport Fishing: Includes uses of water for commercial and recreational collection of fish, shellfish, and other organisms including, but not limited to uses involving organisms intended for human consumption or bait purposes. WILD - Wildlife Habitat: Includes uses of water that support terrestrial ecosystems including, but not limited to, preservation and enhancement of terrestrial habitats, vegetation, wildlife, (e.g., mammals, birds, reptiles, amphibians, invertebrates), or wildlife water and food sources. BIOL - Preservation of Biological Habitats of Special Significance: Includes areas of water that support areas or habitats, such as established refuges, parks, sanctuaries, ecological reserves, or areas of biological significance (ASBS), where preservation or enhancement of natural resources requires special protection. WILD - Wildlife Habitat: Includes uses of water that support terrestrial ecosystems including, but not limited to, preservation and enhancement of terrestrial habitats, vegetation, wildlife, (e.g., mammals, birds, reptiles, amphibians, invertebrates), or wildlife water and food sources. RARE - Rare, Threatened, or Endangered Species: Includes uses of water that support habitats necessary, at least in part, for the survival and successfiil maintenance of plant or animal species established under state or federal law as rare, threatened, or endangered. SPWN - Spawning, Reproduction, and/or Early Development: Includes uses of water that support high quality aquatic habitats suitable for reproduction and early, development of fish. This use is applicable only for the protection of anadromous fish. SHELL - Shellfish Harvesting: Includes uses of water that habitats suitable for the collection of filter feeding shellfish (e.g. clams, oysters, and mussels) for human consumption, commercial, or sport purposes. 1.3.1 Coastal Waters Coastal waters have the following beneficial uses as shown in Attachment "B". None of these beneficial uses will be impaired or diminished due to the construction and operation of this project. 1.3.2 Groundwater Groundwater beneficial uses includes agricultural and potentially municipal and industrial. None of these beneficial uses will be impaired or diminished due to the construction and operation of this project. See Attachment "B" 1.4 303(d) Status According to the Califomia 2006 303d list published by the San Diego Regional Water Quality Control Board, the Agua Hedionda Lagoon is listed as the impaired water body associated with this project. The project location and watersheds have been compared to the current published 303d list of impaired water bodies (See section IILB.2 ofthe City of Carlsbad Standard Urban Stormwater Mitigation Plan). Drainage from the site eventually enters the Pacific Ocean at the Agua Hedionda Lagoon mouth. The listed pollutants are bacterial indicators, sedimentation/siltation, diazinon, and total dissolved soUds. The majority of the previously listed pollutants will be removed from stormwater runoff by the private detention basins located on each lot prior to being discharged offsite. It is our opinion that any residual from this project will be removed during transport. 2.0 CHARACTERIZATION OF PROJECT RUNOFF 2.1 Expected Discharges There are no sampling data available for the existing site condition. In addition, the project is not expected to generate significant amounts of non-visible pollutants. However, the following constituents are commonly found on similar developments and could affect water quality: Primary Pollutants of Concem Sediment • Bacteria & Viruses Secondary Pollutants of Concem Nutrients Trash and debris Oil & Grease from paved areas • Oxygen Demanding Substances • Pesticides Project Catsgoms Nytrisnls Metals Trash & D^ts Gf5258 Detasi^ri De^eiojBmsnt % X X X X X X Rssiitemis^ Ctevelqomsflt X X mi X [^-el opment >10G,SODftJ X X AbC^xnotive X X X X X X X Kfiside D2'>«lqBinait >5.pm ^ X X X X X X pj»k»^ Lois pil X X ?«) X X X X X X=anlii::^Eat«^ (3) A potefilol Mli-ont if 1^ i<se i cn-sitE. 2.2 Soil Characteristics The project area consists of varying soil types as determined from the report entitied Preliminary Geotechnical Investigation, Proposed 26-Lot Subdivision, Camino Hills Drive Carlsbad, Californina by Vinje & Middleton Engineering dated June 23, 2006. The Hydrologic group for this soil is D. The Coimty of San Diego Hydrology manual establishes that these soils have a runoff coefficient of 0.41 (predevelopment) and 0.49 (postdevelopment) respectively. (Note: Information regarding soil conditions is also available in the Soil Survey, San Diego Area, California, US Department of Agriculture, 1973.) 3.0 MITIGATION MEASURES TO PROTECT WATER QUALITY To address water quality for the project, BMPs will be implemented during constmction and post-constructi on. 3.1 Construction BMPs A detailed description of the constmction BMPs will be developed during the Grading Plan and Improvement Plan Engineering. Since the project is in the preliminary development phase only a listing of potential types of temporary BMPs are available. This includes the following: • Silt Fence • Desilting Basin • Fiber Rolls • Gravel Bag Berm • Street Sweeping and Vacuuming • Sandbag Barrier • Storm Drain Inlet Protection • Material Delivery and Storage • Stockpile Management • Spill Prevention and Control • Solid Waste Management • Concrete Waste Management • Stabilized Construction Entrance/Exit • Water Conservation Practices • Dewatering Operations • Paving and Grinding Operations • Vehicle and Equipment Maintenance • Permanent Revegetation of All disturbed uncovered areas • Erosion Control Mats and Spray-on Applications Constmction BMPs for this project will be selected, constmcted, and maintained so as to comply with all applicable ordinances and guidance documents. 3.2 Post-construction BMPs Pollutants of concem as noted in section 3 will be addressed through three types of BMPs. These types of BMPs are site design, source control and treatment control. Site Design BMP's • The project is designed to minimize the use of impervious areas. • The project is designed to leave natural steep slopes onsite undisturbed • The project does not propose any directly connected impervious areas • All manufactured slopes onsite will be planted with native or drought tolerant trees and shmbs. • The project proposes brow ditches to safely convey mnoff from slopes. • The project does not propose any permanent channel crossings. Source Control BMP's • The project proposes no permanent onsite material or trash storage locations. • The project shall install irrigation systems with rain shutoff devices to prevent irrigation during precipitation. • The project shall install irrigation systems designed to meet the specific area's water requirements. The following treatment control BMP's will be implemented to address water quality: • The project proposes a mechanical storm water treatment device by Filterra to treat the mnoff generated from the 85* percentile storm event along with a grass bio-swale. To ensure pollutants of concem are removed from runoff, the grass lined bio-swale will have engineered soii. Pollutant removal specifications for Filterra can seen in attachments "D" of this report. 3.2.1 Bio Filters Bio Filtrafion strips, also known as vegetated buffer strips, are vegetated sections of land over which storm water flows as overland sheet fiow. The biofiltration system proposed for this project utilizes slope rounding berms, ditches and the existing natural drainages as shown on the attached project plans. Pollutants are removed by filtration through the existing soils and vegetation. Biofiltration swales are mainly effective at removing debris and solid particles, although some dissolved constituents are removed by absorption into the soil. For more information regarding vegetated buffer strips refer to CASQA BMP fact sheet TC-31. 4.0 OPERATION AND MAINTENANCE PROGRAM Numerically sized permanent BMP's and LID Filterra units located in common spaces and in the public roadway shall be maintained by the subdivision HOA. Other BMP's, including individual lot grass swales and landscaping, are to be maintained as necessary by the appropriate private land owners. All BMP's are to be inspected at least once a year or after each significant rainfall event or as reconmiended by manufacturer. 4.1 Bio-Filters The operational and maintenance needs of a Swale are as follows: • Vegetation management to maintain adequate hydraulic functioning and to limit habitat for disease-carrying animals. • Animal and vector control. • Periodic sediment removal to optimize performance. • Trash, debris, grass trimmings, tree pruning, and leaf collection and removal to prevent obstmcfion of a Swale and monitoring equipment. • Erosion and stmctural maintenance to prevent the loss of soil and maintain the performance of the Swale. Functional Maintenance Functional maintenance has two components: Preventive maintenance Corrective maintenance preventive Maintenance Preventive maintenance activities to be instituted at a Swale are: • Trash and Debris. During each inspection and maintenance visit to the site, debris and trash removal will be conducted to reduce the potential for inlet and outlet stmctures and other components from becoming clogged and inoperable during storm events. • Sediment Removal. Sediment accumulation, as part of the operation and maintenance program at a Swale, will be monitored once a month during the dry season, after every large storm (0.50 inch), and monthly during the wet season. Specifically, if sediment reaches a level at or near plant height, or could interfere with flow or operation, the sediment will be removed. If accumulation of debris or sediment is determined to be the cause of decline in design perfonnance, prompt acfion (i.e., within ten working days) will be taken to restore the Swale to design performance standards. Removal of Standing Water. Standing water must be removed if it contributes to the development of aquatic plant communities or mosquito breeding areas. • Fertilization and Irrigation. The vegetation seed mix has been designed so that fertilization and irrigation is not necessary. Fertilizers and irrigation will not be used to maintain the vegetation. • Elimination of Mosquito Breeding Habitats. The most effective mosquito control program is one that eliminates potential breeding habitats. Corrective Maintenance Corrective maintenance is required on an emergency or non-routine basis to correct problems and to restore the intended operation and safe function of a Swale. Corrective maintenance activities include: • Removal of Debris and Sediment. Sediment, debris, and trash, which impede the hydraulic ftmctioning of a Swale and prevent vegetative growth, will be removed and properly disposed. • Stmctural Repairs. Once deemed necessary, repairs to stmctural components of a Swale and its inlet and outlet stmctures will be done within 10 working days. • Embankment and Slope Repairs. Once deemed necessary, damage to the embankments and slopes of Swales will be repaired within 10 working days). • Erosion Repair. Where a reseeding program has been ineffective, or where other factors have created erosive conditions (i.e., pedestrian traffic, concentrated fiow, etc.), corrective steps will be taken to prevent loss of soil and any subsequent danger to the performance of a Swale. There are a number of corrective actions than can be taken. These include erosion control blankets, riprap. Hazardous Waste Suspected hazardous wastes will be analyzed to detennine disposal options. Hazardous wastes generated onsite during constmction activities will be handled and disposed of according to applicable local, state, and federal regulations. A solid or liquid waste is considered a hazardous waste if it exceeds the criteria list in the CCR, Title 22, Article 11. 6.0 FISCAL RESOURCES The maintenance of the all BMP's noted in tiiis report will be performed as necessary by the private land ovmer and home owners association. The land ovmers and home ovmers association will be subject to all applicable ordinances referenced herein. It is the sole responsibility ofthe private land owner and home owners association to follow the recommendations in this report for inspection & maintenance of BMP's, and standing water removal on his/her property. The land owner and home owners association is to be held accountable for any vioiations or damage to adjacent properties due to a lack of proper BMP maintenance. ATTACHMENT "A" Beneficial Uses Table 2-3. BENEFICIAL USES OF COASTAL WATFR.c; Includes the tidai prisms of the Otay and Sweetwater Rivers. Fishing from shore or boat permitted, but other water contact recreational (REC-1) uses are prohibited. Existing BGneficial Use Table 2-3 BENEFICIAL USES Coastal Waters BENEFICIAL USE Coastal Waters Hydrologic I N R R C B E W R M A M S w S Unit Basin N A E E 0 1 S J A A Q 1 P A H Number D V C C M 0 T L R R U G w R E 1 2 M L D E , A R N M L L Pacific Ocean • • e 0 0 0 • 0 0 0 0 0 0 Dana Point Harbor • • 0 0 0 0 0 0 0 o Dei Mar Boat Basin • • 0 0 0 0 0 0 o 0 Mission Bay • • 0 0 0 . 0 0 0 O 0 0 Oceanside Harbor • • • 0 0 0 0 0 0 0 San Diego Bay ^ O • • 0 0 0 0 0 0 0 0 0 Coastal Lagoons Tijuana River Estuary 11.il • 0 0 0 0 0 0 0 0 0 0 Mouth of San Diego River 7.11 0 0 0' 0 0 0 0 ® 0 Los Penasquitos Lagoon 6.10 • 0 0 0 0 O 0 0 0 0 San Dieguito Lagoon 5.11 0 0 0 0 0 0 0 0 0 Batiquitos Lagoon 4.51 o 0 0 0 0 0 0 0 0 San Elijo Lagoon 5.61 0 0 0 0 0 0 0 0 ® Aqua Hedionda Lagoon 4.31 o 0 0 0 0 0 0 0 0 0 0 0 March 12, )937 2-47 Table 2-5. BENEFICIAL USES OF GROUND WATERS BENEFICIAL USE Ground Water Hydrologic M A 1 N P F G Ground Water Unit Basin U G 1 N R R W Number N R D 0 C S H R CARLSBAD HYDROLOGIC UNIT 4.00 Loma Alta HA 2 4.10 + 0 Buena Vista Creek HA 4.20 El Salto HSA 2 4.21 0 0 0 Vista HSA 4.22 0 0 0 Aqua Hedionda HA 4.30 Los Monos HSA 2 4.31 0 0 0 Los Monos HSA 5 4.31 0 0 0 Los Monos HSA 6 4.31 0 0 0 Buena HSA 4.32 0 0 0 Encinas HA 4.40 + ThosB bsnoficia! uses do not apply westerly of the eastflrly boundary of the right-of-way of Interstate Highway 6 ahd this araa is axceptad from the sourcBs of drinking water policy. The beneficial uses for the remainder of the hydrologic area are as Bhown. ' These beneficial use designations apply to the portion of HSA 4.31 bounded on the west by the easterly boundary of Interstate Highway B right-of-way; on the east by the Bastarly boundary of E! Camino Real; and on tha north by a line extending along the southerly edge of Agua Hedionda Lagoon to the easteriy end of the lagoon, thence In an easterly diractioh to Evans Point, thence easteriy to El Camino Rea! along the ;idge lines separating Letterbox Canyon and the area draining to tha Marcario Canyon. 3 These beneficia! use designations apply to the portion of HSA 4.31 tributary to Agua Hedionda Creek downstream from the El Camino Real crossing, axcopt lands tributary to Marcario Canyon (located directly southerly of Evans Point), land directly south of Agua Hedionda Lagoon, and araas west of Interstate Highway 5. 0 Existing Beneficial Use O Potential Beneficial Usa -f- Excepted From MUN (sea text) ToblB 2-5 BENEFICIAL USES 2-53 September 8, 1994 ATTACHMENT "B" Best Management Practices - E>rP INSPZCnON AND MALNTEKANCE CHECKLIST Drainage faciHiies appurtsaanc tp the private road include Stomi V/ater Best Mana^erTient Practices (BMPs), which require the regular inspectio.a aiid maintenance described be[o«. 5a.-i Die|o County Watershed Protection Ordinance requires that inspection and main;ena.Qce records must be kept for a period of three years. 1. BIOHLTR-^TION STRIPS AND SWALES A. Monitoring Frequency and/or Indicators First Year Q Before Onset of Wet Season (October) D After Rain EvenU Greater than 0.5 inches a After Wee Season (Nfay) Subseouen' Years • Annually prior to rainy season (October) B. Alaintenance Aclions General Maintenance a Repair inlet and'o: ou-Je-. structures, side slopes, fences, or other structural elements as needed to maintain performance of facility. Veeetarion Q Trim vegetadon to average height of 6 inches and remove trimmings. a Remove emergent L^ees, other woody vegetation, and weeds. D Re-seed or re-plant barren spots prior lo rainy season. D Install erosion blanket on barren spots if re-vegetation is not successful. Trash and De'o.ns O Remove liuer, trash, and vegetative debris. Sediment Accumulation a Remove sediment if sediment is at or near plant heightL Rodent and Other Vec'.or Control Q Abate and contro] ro-dents as necessary to maintain performance of faciiity. a Drain standing v--ater. C. Waste Disposs^ Sediment, other pollutants, and all other waste shall be properly disposed of in a licensed landiili or by another appropriate disposal method as approved by the Regional Water Qualiry Control Board. AIJ waste shall be disposed of off-site in accordance with local, state, and Federal legiilations. 2. BIORETENTION AREAS " A. Monitoring Frequency and/or Indicators First Year • Before Onset of Wet Season (October) Q A.fierRain Events Greater than 0.5 inches Q'. After Wee Season (May) Subsequent Years Q AninuaJiy prior to rainy season (October) B. Maintenance Actions General Maintenance Q Repair irJet and/or outlet structures, side slopes, fences, or other SUuctural elements as needed to maintain perfonnance of facility. Vegetation a Trim vegetation to average height of 12 inches and remove mmmings. D Remove emergent trees and other vegetation (i.e., plants not pan of bioretention basin vegetation plan) and weeds, a Re-seed or re-plant barren spots prior to rainy season. D Install erosion blanket on barren spots if re-vegetation is not successful. Trash and Debris O Remove Jitterj L'ash, and vegetative debris. Sediment Accumulation n Remove sedimeni if sediment is at or near plant height Rodent and Other Vector Control O Abate and control rodents as necessary to maintain performance of facility, a X>rain standing water. C- "VVsste Disposal Sediment, other pollutants, and all other waste shall be properly disposed of in a licensed landfiU or by another appropriate disposal method as appnoved by the Regional Water Quality Control Board. All waste shall be disposed of off-site in accordance -^rui local, state, end Federal regulations. ATTACHMENT "C" Best Management Practices Site Design & Landscape Planning SD-lo • ^ . V?^.7i Design Objectives EI Maximize Infiltration 0 Provide Relention 0 SlowRunuff 0 Minimize impervious Land Coverage Prohibit Dumping of improper Matenals Conlain Polfulan is Collect and Convey Description Each project site possesses unique topogi'aphic, hydrologic, and vegetative features, some of Vy'Ioich ai'e more suitable for development than others. Integrating and incorporating appropriate landscape planning methodologies into the project design is the most effective action that can be done to minimize surface and groundwater contamination from stormwater. Approach Landscape planning should couple consideration of land suitability for urban uses with consideration of communit}'goals and projected growth. Project plan designs should conserve natLU-al areas to tlie e>lent possible, ma.ximize natural water storage and infiltration opportimities, and protect slopes and channels. Suitable Applications Appropriate apphcations include residential, commercial and industrial areas planned for development or redevelopment. Design "Considerations Desigii requirements for site design and landscapes planning should conform to apphcable sUuidaids and specifications of agencies v,-ith jurisdiction and be consistent v.'ith applicable Genend Plan and Local .'^rea Plan policies U'.i.l-.i-:M',s;i,:K.'.i j i.. Ca' ':--n;o S^D'n.vater BMP Handbook rJe ' 0=- &l:'Cineit and P.=development 1 oF4 SD-10 Site Design & Landscape Planning Designing Neiu Installations Begin the development of a plan for the landscape unit witii attention to the following general principles: • Formulate tiie plan onthe basis of clearly articulated community goals. Carefully identify conflicts and choices between retaining and protecting desired resources and community growth. • Map and assess land suitability' for urban uses. Include the following landscape features in the assessment: wooded land, open unwooded land, steep slopes, erosion-prone soils, foundation suitability, soil suitabilit)' for waste disposal, aquifers, aquifer recharge areas, wetlands, floodplains, surface waters, agricultural lands, and various categories of urban land use. When appropriate, the assessment can highlight outstanding local or regional resources that the community determines should be protected (e.g., a scenic area, recreational area, threatened species habitat, farmland, fish run). Mapping arid assessment should recognize not only these resources but also additional areas needed for their sustenance. Project plan designs should conserve natural areas to the extent possible, maximize natural water storage and infiltration opportunities, and protect slopes and channels. Conserve Natural Areas during Landscape Planmng If apphcable, the following items are required and must be implemented in the site layout during the subdivision design and approval process, consistent with applicable General Plan and Local Area Plan policies: • Cluster development on least-sensitive portions of a site while leaving the remaining land in a natural undisturbed condition. • Limit clearing and grading of native vegetation at a site to the minimum amount needed to build lots, allow^ access, andprovide fire protection. B Maximize trees and other vegetation at each site by planting additional vegetation, clustering tree ar-eas, and pi'omoting the use of native and/or drought tolerant plants. • Promote natural vegetation by using parking lot islands and other landscaped areas. • Preserve riparian areas and wetiands. Maximize Natural Water Storage and Infiltration OpportuJiities Within the Landscape Unit D Promote tlie consen'ation of forest cover. Building on land that is already deforested affects b asin hydrology to a lesser extent than converting forested land. Loss of forest cover reduces interception storage, detention in the organic forest floor layer, and water losses by evapoti'aiispiration, resulting in large peak runoff increases and either their negative effects or the expense of countering tiiem witii structural solutions. B Maintain natur-al storage resen'oirs and drainage corridors, including depressions, areas of permeable sods, sw^ales, and intermittent streams. Develop and implement policies and 2 of 4 Carifornia Stormwater BMP Handbook January 20Q3 New DG/elopment and Redevelopment Site Design & Landscape Planning SD-lQ regulations to discom-age the clearing, filling, and channelization of these features. Utilize them in drainage networks in preference to pipes, culverts, and engineered ditches, • Evaluating infiltration opportunities by referring to the stormwater management manual for the jurisdiction and pay particular attention to the selection criteria for avoiding groundwater contamination, poor soils, and hydrogeologicai conditions that cause these facihties to fail. If necessary, locate developments with large amounts of impen-ious surfaces or a potential to produce relatively contaminated runoff away from groundwater recharge areas. Protection of Slopes and Channels during Landscape Design • Convey runoft' safely from the tops of slopes. • Avoid disturbing steep or unstable slopes, • Avoid disturbing natural channels. • Stabilize disturbed slopes as quickly as possible. • Vegetate slopes with native or drought tolerant vegetation. • Control and treat flows in landscaping and/or other controls prior to reaching existing natural drainage systems. • Stabilize temporary- and permanent chaimel crossings as quickly as possible, and ensure that increases in run-off velocity and frequency caused by tihe project do not erode the channel. • Install energy dissipaters, such as riprap, at the outiets of new storm drains, culverts, conduits, or channels tiiat enter unlined channels in accordance with applicable specifications to minimize erosion. Energy dissipaters shall be installed in such a way as to minimize impacts to receiving waters. B Line on-site conveyance chaimels where appropriate, to reduce erosion caused by increased flow velocitv^ due to increases in tributary impenious area. The first choice for linings should be grass or some other vegetative surface, since tiiese materials not only reduce runoff velocities, but aiso proride water qualit}' benefits from filtration and infiltration. If velocities in the chaimel are high enough to erode grass or other vegetative hnings, riprap, concrete, soil cement, or geo-grid stabilization are otiier alternatives. • Consider other design principles that are comparable and equaUy effective. Redeveloping Existing Installatiojis Various jurisdictional stormwater management and mitigation plans (SUSMP, VV'QMP, etc.) define "redevelopment" in terms of amoimts of additional impervious aiea, increases in gross floor area and/or exterior construction, and land ciisturbing activities with structural or impenioiis suifaces. The definition of" redevelopment" must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment If tiie definition apphes, the steps outiined under "designing new installations" above should be followed. January 2003 California Stormwater BMP Handbook 3 oF4 Nsw D'^velooment and P,ede^'elooment SD-10 Site Design & Landscape Planning Redevelopment may present significant opportunity to add features which had not previously b een implemented. Examples include incorporation of depressions, areas of permeable soils, and swales in newly redeveloped areas. While some site constraints may exist due to the status of tdready existing infrastructure, opportunities should not be missed to maximize infiltration, slow runoff, reduce impervious areas, disconnect directiy connected impervious areas. Other Resources A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County- Department of Public Works, May 2002. Stormwater Management Manual for Westem Washington, Washington State Department of Ecology, August 2001. M odel Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego Coimty, February 14, 2002. Model Water Quality Management Plan (WQMP) for County of Orange, Orange C^ounty Flood Control District, and the Incorporated Cities of Orange County^, Draft February 2003. Ventura Coimt}^ide Technical Guidance Manual for Stormwater Qualit}' Control Measures, July 2002. 4 of 4 California Stormwater BMP Handbook Jenuary 2003 New Development and Redevelopment Vegetated Buffer Strip TC-3 a Design Consideration: • Tributary Area • Slope • Water Availabilily • Aesl'nelcs Description Grassed bufi'er strips (vegetated filter strips, fdter strips, and grassed filtei's) are vegetated surfaces that are designed to tr-eat sheet fiow from adjacent surfaces. Filter strips function by slovsing runoft* velocities and allowing sediment and other pollutants to settie and by pro\iding some infiltration into miderlving sods. Filter strips were originally used as an agricultui"al treatment practice and have more recendy evolved into an mhan practice. With proper design and maintenance, fdter strips can provide relatively higli pollutant removal. In adchtion, tlie pubhc views them as lanclscaped amenities and not as stormwater infrastructui'e. Consequentiy, tiiere is Uttie resistance to their use, California Experience Caltr-ans constructed and monitored three vegetated buffer strips in soutiieni Califoiriia and is currentiy evaluating tiieir performance at eight additional sites statewide. These strips were generally effective in reducing the volume and mass of pollutants in innoif. Even in the areas where tiie aimual rainfall was only about lO inches/vT, tiie \-egetation did not require adcUtional irngation. One factor tiiat stt'ongly affected performance was the presence of large nmnbers of gophers at most of the southern Califoniia sites. The gophers created eaitiien mounds, destroyed vegetation, and generally reduced the effecti^•eness of tiie conti-ols for TSS reduction. Advantages B Puffers requu'e mimmal ruimtenance actint:^' (gerierallyjust erosion pre\'ention and mo^Miig). c Jf properly desigi]ed, I'egetated, and operated buffer strips can pro\ide reliable water quiihtv' benefits m conjunction with lugli aesthetic appeal. Targeted Constituents 0 Sedimeni 0 Nutrients 0 Trash 0 Metals EI Bacieria Ef Oil and Grease 0" Organics Legend (Rsmoval Effactiven€ss) • Low • Higli A Medium L.^!.^->;;^l'.^;l.:K^|•^•^ii la-tu^ry 200: Ca!ifor,-ii5 S^ormi/.c'er BMP Handbook fiew Dfv&io:'>T!-?nt 5'id Re jevelopment 1 of 6 TC-31 Vegetated Buffer Strip • Flow characteristics and vegetation t>pe and density can be closely controUed to maximize BMP effectiveness. • Roadside shoulders act as effective buffer strips when slope and length meet criteria described below. Limitations • May not be appropriate for industrial sites or locations where spills may occur, • Buffer strips cannot treat a very large drainage area, • A thick vegetative cover is needed for these practices to function properly. • Buffer or vegetative filter length mustbe adequate and flow characteristics acceptable or water quality^ performance can be severely Hmited, • Vegetative buffers may not provide treatment for dissolved constituents except to the extent that flows across the vegetated surface are infiltrated into the soil profile. • This technologv' does not provide significant attenuation of the increased volume and flow rate of runoff during intense rain events. Design and Sizing Guidelines • Maximum length (in the direction of flow tow^ards the buffer) of the tributary area should be 6 o'f eet. M Slopes should not exceed 15%, » Minimum length (in direction of flow) is 15 feet. • Width shouldbe the same as the tributary area. • Either grass or a diverse selection of other low growing, drought tolerant, native vegetation should be specified. Vegetation whose growing season con'esponds to the wet season is preferred, Construction/Inspection Considerations • Include directions in fhe specifications for use of appropriate fertihzer and sod amendments based on soil properties determined through testing and compared to the needs of the vegetation requirements, u Install strips at tiie time of the year when there is a reasonable chance of successful estabhshment without irrigation; however, it is recognized that rainfall in agivenyear may not be sufficient and temporarv' irrigation may be required, n If sod tiles must be used, they should be placed so tiiat there are no gaps bet.veenthe tiles; stagger the ends of the tiles to prevent the formation of channels along the strip. B Use a roUer on tiie sod to ensure that no air pockets form between the sod and the soil. 2 of S Caiifomia Stormwater BMP Handbook January 200; Npw DevelODment and P-edevelopment Vegetated Buffer Strip TC-31 • Where seeds are used, erosion controls will be necessary to protect seeds for at least 75 days after the first rainfall of the season. Performance Vegetated buffer strips tend to provide somewhat better treatment of stormwater runoff than sw^ales and have fewer tendencies for channehzation or erosion. Table 1 documents the poUutant removal observed in a recent study by Caltrans (2002) based on three sites in southem California. The column labeled "Significance" is the prob abUity thatthe mean influent and effluent EMCs are not si^ficantiy different based on an anal>'sis of variance. The removal of sediment and dissolved metals was comparable to that observed in much more complex controls, Reduction in nitrogen w^as not significant and all of the sites exported phosphorus forthe entire study period. This mayhavebeentheresult of using salt grass, a warm weather species that is dormant during the wet season, and which leaches phosphorus when dormant. Another Caltrans study (impublished) of vegetated highway shoulders as buffer strips also found substantial reductions often within a very short distance of the edge of pavement Figure 1 presents a box and whisker plot of fhe concentrations of TSS in highway runoff after traveling various distances (shown in meters) through a vegetated filter strip with a slope of about 10%. One can see that the TSS median concentration reaches an irreducible minimum concentration of about 20 mg/L within 5 meters of the pavement edge. Table 1 Pollutant Reduction in a Vegetated Buffer Strip Mean EMC ... . Removal Constituent Influent Effluent ^ (mg,/L) (mg/L) Significar P TSS 119 31 74 <0.000 0,67 0.58 13 .0-367 TKN-N 2.50 2,10 16 0,542 TotalN^ 3.17 2,68 15 - Dissolved P 0.15 0,46 -206 0.047 Total P 0,42 0,62 -52 0,035 Total Cu 0.05S 0,009 84 <0,000 Total Pb 0,046 0.006 88 <0-000 Total 2n 0,245 0.0 5,5 78 <0.000 Dissolved Cu 0,029 0.007 77 0.Q04 Dissolved Pb 0,004 0,002 66 0.005 Dissolved Zn 0.099 0,035 65 <0.000 Ja,nuary 2003 California Stormwater EMP Handbod< New O^vslnnment arid Redevelooment 30^6 TC-31 Vegetated Buffer Strip Filter strips also exhibit good removal of Utter and other floatables because the water depth in these systems is weU below the vegetation height and consequentiy fhese materials are not easily transported through them. Unfortunately little attenuation of peai runoff rates and volumes (particularly for larger events) is normaUy observed, depending on the soil properties. Therefore it may be prudent to foUow the strips with another practice than can reduce flooding and chaimel erosion downstream. Siting Criteria The use of buffer strips is Umited to gentiy sloping areas where the vegetative cover is robust and diffuse, and where shallow^ flow characteristics are possible. The practical water quality benefits can be effectively eliminated with the occurrence of significant erosion or when flow concentration occurs across the vegetated surface. Slopes should not exceed ispercent or be less than 1 percent The vegetative surface should extend across the fuU width of fhe area being di'ained. The upstream boundary of the filter should be located contiguous to the developed area. Use of a level spreading device (vegetated berm, sawtooth concrete border, rock trench, etc) to facUitate overland sheet flow is not normally recommended because of maintenance considerations and the potential for standing water. Fdter strips are appUcable in most regions, but are restricted in some situations because they consume a large amount of space relative to other practices. Filter strips are best suited to treating runoft' from roads and highways, roof downspouts, small parking lots, and pervious siufaces. They are also ideal components of fhe "outer zone" of a stream buffer or as pretreatment to a striictural practice. In arid areas, however, the cost of irrigating the grass on the practice wiU most likely out^veigli its water quaUtv^ benefits, although aesthetic considerations may be sufficient to overcome this constraint Filter strips are generaUy impractical in ultra-urban areas where Uttie per-\ious surface exists. Some cold water species, such as trout, are sensitive to changes in temperature. While some treatment practices, such as wet ponds, can warm stormwater substantially, filter strips do not 4 of e California Stormwater EMP Handbook Janugry 2003 Vegetated Buffer Strip TC-3 i are not expected to increase stormwater temperatures. Thus, these practices are goodfor protection of cold-water streams. Filter strips should be separated from fhe ground water by between 2 and 4 ft to prevent conE:ainination and to ensure that the filter strip does notremain wetbetween storms. Additional Design Guidelines Filter strips appear to be a minimal design practice because they are basically no more than a grassed slope. In general the slope of the strip should not exceed i5fc% and tdie strip should be at least 15 feet long to provide water quality treatment Both the top and toe ofthe slope should be as flat as possible to encourage sheet flow and prevent erosion. The top of the strip should be installed 2-5 inches below the adjacent pavement, so that vegetation and sediment accumulation at the edge of the strip does not prevent runoff from entering. A major question that remains unresolved is how large fhe drainage area to a strip can be. Research has conclusively demonstrated that these are effective on roadside shoulders, where the contributing area is about twice the buffer area. They have also been instaUed on fhe perimeter of large parking lots where they performed fairly effectively; however much lower slopes may be needed to provide adequate water quality treatment The filter area should be densely vegetated with a mix of erosion-resistant plant species that. effectively bind the soil. Native or adapted grasses, shrubs, and trees are preferred because fbey generally require less fertiUzer and are more drought resistant than exotic plants-. Runoff flow velocities should not exceed about 1 fps across the vegetated surface. For engineered vegetative strips, the facility surface shouldbe graded flat prior to placement of vegetation. Initial establishment of vegetation requires attentive care including appropriate watering, fertiUzation, and prevention of excessive flow across the facUity until vegetation completely covers the area and is well established. Use of a permanent irrigation system may help provide maximal water quality performance. In cold climates, fdter strips provide a convenient area for snow storage and treatment. If used for this purpose, vegetation in the filter strip should be salt-tolerant (e.g., creeping bentgrass), and a maintenance schedule should include the removal of sand buUt up at the bottom of the slope. In arid or semi-aiid cHmates, designers should specif)' drought-tolerant grasses to minimize irrigation requirements. Maintenance Filter strips require mainly vegetation management; therefore littie special ti*aining is needed for maintenance crews. Tvpical maintenance activities and frequencies include: B Inspect strips at least twice annually for erosion or damage to vegetation, preferably atthe end ofthe wet season to schedule summer maintenance and before major faU run-off to be" stu-e die strip is ready for winter. However, additional itispection after penods of heavy nm- off is most desirable, Ttie strip shouldbe checked for debris and litter and aieas of sediment accumulation, B Recent research on biofiltration sw-ales, but Ukely appUcable to strips (ColweU et al,, 2000), indicates that grass height and mowing frequency have Uttie impact on pollutant removal; January 2003 California Stormwater BMP Handbook 5o'S hlsw Development arid R,edeve!cpment TC-31 Vegetated Buffer Strip consequentiy, mowing may only be necessarv' once or twice a year for safetv' and aesthetics or to suppress weeds and woody vegetation. • Trash tends to accumulate in strip areas, particularly along highways. The need for Utter removal shouldbe determined through periodic inspection but Utter should always be removed prior to mowing, • Regularly inspect vegetated buffer strips for pools of standing water. Vegetated buffer strips can become a nuisance due to mosquito breeding in level spreaders (unless designed to dewater completely in 48-72 hours), in pools of standing water if obstructions develop (e.g. - debris accumulation, invasive vegetation), and/or if proper drainage slopes are not implemented and maintained. Cost Construction Cost Littie data is available on the actual construction costs of filter strips. One rough estimate can be the cost of seed or sod, which is approximately 30$ per ft= for seed or 70$ per ft' for sod. This amounts to betw^een $13,000 and $30,000 per acre of filter strip. This cost is relatively high compared wifh ofher treatment practices. However, the grassed area used as a filter strip may have been seeded or sodded even if it were not used for treatment. In these cases, the only adcUtional cost is the design. T>pical maintenance costs are about $350/acre/year (adapted from SWRPC, 1991), This cost is relatively inexpensive and, again, might overlap withregular landscape maintenance costs. The true cost of filter strips is tiie land they consume. In some situations this landis available as wasted space beyond back yards or adjacent to roadsides, but this practice is cost-prohibitive when land prices are high and land could be used for other purposes, Mamtenance Cost Maintenance of vegetated bufter strips consists mainly of vegetation management (mowing, inigation if needed, w-eeding) and Utter removal, Consequentiy fhe costs are quite variable depending on the frequency of fhese activities and the local labor rate. References and Sources of Additional Information Caltrans, 2002, EMP Reti'ofit Pilot Program Proposed Final Report, Rpt. CTSW-RT-01-050, Califomia Dept of Transportation, Sacramento, CA Center for Watershed Protection (CWP). 1996. Design of Stormwater Filtering Systems. Prepared for Chesapeake Reseaixh Consoitiiun, Solomons, MD, and EPA Region V, Chicago, IL. Desbonette, A., P. Pogue, V, Lee, and N, Wolft', 1994. Vegetated Buffers in the Coastal Zone: A Summary Review and Bibliography. Coastal Resources Center, Universitj' of Rhode Island, Kingston, RI, Magette, W,, R, Brinsfield, P.. PaJmer and J, Wood. 1989, Nutrient and Sediment Removal by Vegetated Filter Strips, Transactions of the American Sodety ofAg/i cultural Engineef's 32(2): 663-667, 6 of 6 California Stormwater BMP Handbook January 200: ri&w Development and Redevelopment Vegetated Buffer Strip TC-3i Metzger, M, E,, D, F. Messer, C. L. Eeitia, C. M. Myers, and V. L, Kramer. 2002. The Dark Side Of Stormwater Runoff Management: Disease Vectors Associated With Structural BMPs. Stormwater 3(2): 24-39. Southeastem Wisconsin Regional Planning Commission (SWRPC). 1991. Cos^s of Urban Nonpoint Source Water Pollution Control Measures. Technical report no. 31. Southeastem Wisconsin Regional Planning Commission, Waukesha, WI. Yu, S., S. Barnes and V. Gerde. 1993. Testing of Best Management Practices for Controlling Highway Runo^. FHWA/VA93-R16. Virginia Transportation Research Councd, Charlottesville, VA. JnforTuation Resources Center for Watershed Protection (CWP). 1997. Stormwater BMP Design Supplement for Cold dim ates. Prepared for U.S. Environmental Protection Agency Office of Wetiands, Oceans and Watersheds. Washington, DC. Maryland Depaitment of the Environment (MDE). 2000. Maryland Stormwater Design Manual, http://w^w^mde.state•md.u5/environment/w•ma/stormwatermanual• Accessed May 22, 2001. January 2003 California Stormwater BMP HandbQd< 7 of 8 New Development and P^edevelopment TC-31 Vegetated Buffer Strip Le-rtl Spreader '{datgoi iochidc gnvel m^^, sills, onb^ded curiu, modular pocutu ptTCinnif, and itabilizcd turf str^) Note: Not lo Scale 8 of 8 California Stormwater BMP Handbook r-Jew Development and P.edevelopment January 2003 ATTACHMENT "C" Storm Water Requirements Applicability Checklist STORfW WATER REQUIREMENTS APPLICABILITY CHECKLIST Project Address 2311 Camino Hills Dr. Assessors Parcel Number(s): 212-050-32 & 33 Project # (city use only): Complete Sections 1 and 2 of the follow/ing 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?* Yes No 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. k 5. Restaurant. 6. Steep hillside development greater than 5,000 square feet. 7. Project discharging to receiving waters within Environmentally Sensitive Areas. /I 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 u * Refer to the definitions section in the Storm Water Standards for expanded definitions ofthe 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 ail answers to Part A are "No", continue to Part B. Part B: Determine Standard Permanent Storm Water Requirements. Does the project propose: Yes No 1. New Impen/ious areas, such as rooftops, roads, parking lots, driveways, paths and sidewalks? 0 2. New pervious landscape areas and irrigation systems? 0 3. Permanent structures within 100 feet of any natural water body? 0 4. Trash storage areas? 0 5. Liquid or solid material loading and unloading areas? 6. Vehicle or equipment fueling, washing, or maintenance areas? V 7. Require a General NPDES Permit for Storm Water Discharges Associated with Industrial Activities (Except construction)?* V 8. Commercial or industrial waste handling or storage, excluding typical office or household waste? 9. Any grading or ground disturbance during construction? 0 1 10. Any new storm drains, or alteration to existing storm drains? 0 J *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, vmw.swrcb.ca.pov/stormwtr/lndustrial.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 ofthe 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? Yes No 1, Is the project subject to California's statewide General NPDES Permit for Storm Water Discharges Associated With Construction Activities? / 1 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? / n 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)? / • 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 tJie 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.l for more details on construction BMP requirements.] ^ A) Higii 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 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. 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 pubiic 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): Tyler Lawson Title: Engineer Signature: Date: ATTACHMENT "D" Numerically Sized BMP Calculations Numerical Sizing Summary Tabata 10-Ac Carlsbad Label Area (SF/Acres) Treatment Method Capacity Adequate Area 1 30,474/0.70 Filterra 1.12 Ac Yes Area 2 15,282/0.35 Filterra 1.12 Ac Yes Area 3 21,120/0.48 Grass Swale 0.50 Ac Yes Area 4 19,232/0.44 Filterra 1.12 Ac Yes Area sub-basins can be seen on the Post Construction BMP Plan SSTHPERCENTILE PEAK FLOW FOR AREA 3 Modified Rational Method - Effective for Watersheds < 1.0 mi^ Project Name [Tabata 10 Acre - 26 Lot Subdivision | Jurisdiction jCity of Carisbad "| BMP Tjrpe I Grass Swale Parallel to Road located in Lot 27 | RATIOMAL METHOD RESULTS Q = CIA where V = CPA where Q = C = 1 = A = V = C = P = A = Total Drainage Area Q: C = 1 = P = A = Q = 85th Percentile Peak Flow (cfs) Runoff Coefficient Rainfall Intensity (0.2 inch/hour per RWQCB mandate) Drainage Area (acres) 85th Percentile Runoff Volume (acre-feet) Runoff Coefficient 85th Percentile Rainfall (inches) Drainage Area (acres 0.49 0.2 inch/hour 0.61 inches 0.5 acres* 0.05 cfs *Note: Area represents area of impervious surface that is directed to flow through the above referenced grass swale. Treatment Swale Numerical Sizing Given: Design flow 0.05 cfs Residence time (req) 9 minutes From Flowmaster v 5.17 Velocity (v) 0.58 fps Required Length of Channel: L=vt Therefore: L= 9 min X 60 sec/min X 0.58 fps = 313 ft Required Length^ 313 ft Actual Length = 330 ft Actual > Required « OK 85th Grass Swale Worksheet for Trapezoidal Channel Project Description Project File n:\haested\academic\fmw\1011.fm2 Worksheet 85th Grass Swale Flow Element Trapezoidal Channel Method Manning's Formula Solve For Channel Depth Inpul Data Mannings Coefficient Cinannel Slope Left Side Slope Right Side Slope Bottom Width Disctiarge 0.030 0.010000 ft/ft 2.000000H : V 2.000000 H : V 2.00 ft 0.21 cfs Results Depth 0.10 ft Flow Area 0.21 ft^ Wetted Perimeter 2.44 ft Top Width 2.39 ft Critical Depth 0.07 ft Critical Slope 0.033372 ft/ft Velocity 0.98 ft/s Velocity Head 0.01 ft Specific Energy 0.11 ft Froude Number 0.58 Flow is subcritical. 08/14/08 11:19:40 AM Academic Edition Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 (203) 755-1666 FlowMaster v5.17 Page 1 of 1 WESTERN ZONE Engineering Design Assistance Kit (DAKit) v07b- WZ filterra Bioretention Systems (866) 349-3458 (866) 349-3458 (951)359-3439 design@filterra.com www.filterra.com Sales Engineering Fax E-mail Web Filterra' Stormwater Bioretention Filtration System Copyrig lit © 2008 by Filterra a Division of Americast Filterra® Overview Bioreteniion Sysiern; Stormwater Bioretention Filtration System Save valuable space with small footprint for urban sites Improve BMP aesthetics with attractive trees or shrubs Reduce lifetime cost with safer and less expensive maintenance Remove Pollutants and Comply with NPDES Filterra® is well-suited for the ultra-urban environment with high removal efficiencies for many pollutants such as petroleum, heavy metals, phosphorus, nitrogen, TSS and bacteria. Filterra® is similar in concept to bioretention in its function and applications, with the major distinction that Filterra® has been optimized for high volume/tlow treatment and high pollutant removal. It takes up little space (often 0.2% Filter Surface Area/Drainage Area) and may be used on highly developed sites such as landscaped areas, green space, parking lots and streetscapes. Filterra® is exceedingly adaptable and is the urban solution for Low Impact Development. Stormwater flows through a specially designed filter media mixture contained in a landscaped concrete container. The filter media captures and immobilizes pollutants; those pollutants are then decomposed, volatilized and incorporated into the biomass of the Filterra® system's micro/macro fauna and flora. Stormwater runoff flows through the media and into an underdrain system at the bottom of the container, where the treated water is discharged. Higher flows bypass the Filterra® via a downstream inlet structure, curb cut or other appropriate relief Expected Average Pollutant Removal Rates (Ranges Varying with Particle Size. Pollutant Loading and Site Conditions) TSS Removal 85% Phosphorous Removal 73% Nitrogen Removal 43% Heavv Metal Removal 33% - 82% Fecal Coliform 57%-76%* Predicted Oii & Grease > 85% * Standard Blend H'ww.filterra.com Bioretention Systems Design Guidelines for Using Filterra® 1. Do not place in a sump condition. The Filterra® cannot be used as a stand alone inlet - it will need effective bypass during higher intensity rainfall events. Plans MUST show Filterra® Top Curb (TC) and Flow Line (FL) spot elevations and also bypass TC (where applicable) and bypass FL spot elevations. The Filterra® TC and FL elevations MUST be higher than the bypass TC and FL elevations for effective bypass. Use Drawing FLP-2 (p.24) as a detail on the project plans. 2. For proper trash collection ensure a minimum 4" and maximum 6" Filterra® throat opening depth and use Drawing CGT-04 (p.25) as a detail on the project plans. 3. Do not direct surface flow to the Filterra® in a "head-on" configuration. Refer to Guidelines GUI-A (p.12) and GU2 (p.13) for grading design that encourages flow to enter a Filterra® in a cross linear flow - left-to-right or right to-left in the gutter in front of the throat, as per a wet curb which prevents system damage. During extreme storm events the excess flow should continue past the Filterra® to a bypass inlet or other means of relief Guideline GU3, Parking Lot Comers, shows corhmon situations (p.14). 4. To calculate which size Filterra® is required, use Table 1, Filterra® Quick Sizing Table, appropriate to the project's geographical region and target treatment regime (p-ll). The entire contributing drainage area to the Filterra® should be considered and the minimum allowable C factors noted. The maximum contributing drainage area will vary with site conditions. For further information relating to sizing, please contact Filterra. 5. To ensure correct installation, include the Standard Filterra® Plan Notes (p.26-27) on your Filterra® detail project sheet, as well as detailed drawings FLP-2 and CGT-4 (p.24,25). 6. Positive drainage of each Filterra® unit's effluent treatment pipe is required to prevent free standing water from accumulating in the system or underdrain. This could occur due to tidal influences or improper connection of Filterra's effluent pipe to a bypass structure or other outfall. 7. Send plans and the completed Filterra® Project Information Form (p.9) to Americast for Filterra® placement review. Plan sheets should include grading, drainage areas, stormwater schedules or profiles, landscape sheets and Filterra® detail sheets. THIS REVIEW IS MANDATORY for warranty to apply and helps ensure that each Filterra® system operates efficiently to maximize performance and minimize maintenance. Our staff also looks for value engineering opportunities. Methods of sending infonnation for review are as follows: E-mail: design@filterra.com Mail or other: AutoCAD or PDF files Filterra Review Fax: (951)359-3439 3380 La Sierra Ave., Suite 104-284 Toll Free: (866) 349-3458 Riverside, CA 92503 www.fiiterra.com Sioretention Systems Items Considered in Americast's Filterra® Plan Reviews Following is a summaiy list ofthe items Americast considers during plan review. Plan sheets should include grading, drainage areas, stormwater schedules or profiles, landscape sheets and Filterra® details. Notes • Filterra® Structure Label or Identification Number Planned Filterra® Box Size • Filterra® Contributing Drainage Area (not the bypass inlet Drainage Area) • The C Factor for each individual Filterra® drainage area Checks The planned Filterra® box size meets project's regional sizing specification Spot elevations (Top Curb & Flow Line) for Filterra® and bypass (TC & FL) The Filterra® spot elevations (TC & FL) are higher than bypass spot elevations The grading design encourages cross linear flow and not head-on flow Filterra® invert elevations are shown (3.5' below TC) Filterra® effluent treatment pipe invert elevations are higher than bypass structure or other out fall invert elevations The Filterra® outlet drain pipe is sized correctly The outlet drain pipe exits perpendicular to the Filterra® wall For any conflicting structures such as storm drain pipes below Filterra® For most efficient placement of Filterra® units Plans include Filterra® details listed below: FLP-2: Filterra' Typical Flow Line and Outlet Pipe Relationship CGT-04: Filterra' Throat Opening and Gutter or Flume Detail Filterra- Standard Plan Notes (2pages) www.filterra.com Filterra® Project Process Flowchart - Design to Maintenance Engineer Incorporates Fillcrra'' in Projecl Design Engineer Sends Plans & Filterra' Project Inlormation Slieet 1(1 Americast ior Review Completed Filterra* Project Information Sheet Filterra* Sizing and Placement Guidelines from Americasi Project Site & Grading Plan AmericHst Reviews Site Plan & Filterra* Project Information Sheet Yes Engineer Completes Project Site Design Americast Sends Comments on Filterra* Placement and Application Engineer Submits Plans to Governing Jurisdiction for Approval Engineer Revises Project Site Design -No Yes- Fitial Approved i'roject Plans Project Goes Out to Bid Project IS Awarded Filterra''Ordered from Americast Filterra* is Produced and Shipped by Americast Filterra* is Installed by Sitework Contracior Filterra* is Activated by Americast Filterra'*' Maintenance Reports Available from Americasi upon Request Filterra'' Maintenance Records Stored in Americast Database 1 Filterra'' is Maintained by Americast for 1 Year Design Phase Construction Phase Maintenance Phase Bold Items indicate services provided by Americast. 01/04/05 ioretention Systems Table 1 .Filterra® Quick Sizing Table (Western Zone -fO.2 in/hr Uniform Intensity Approach) Available Filterra® Box Sizes (feet) Recommended Commercial Contributing Drainage Area (acres) where C = 0.85 Outlet Pipe 4x6.5 or 6.5x4 up to 0.35 4" SDR-35 PVC 4x8 or 8x4 0.36 to 0.44 4" SDRr35 PVC Standard 6x6 0.45 to 0.49 4" SDR-35 PVC 6x8 or 8x6 0.50 to 0.65 4" SDR-35 PVC 6x10 or 10x6 0.66 to 0.82 6" SDR-35 PVC 6x12 or 12x6 0.83 to 0.98 6" SDR-35 PVC Available Filterra® Box Sizes (feet) Recommended Residential Contributing Drainage Area (acres) where C = 0.50 Outlet Pipe 4x6.5 or 6.5x4 up to 0.60 4" SDR-35 PVC 4x8 or 8x4 0.61 to 0.74 4" SDR-35 PVC Standard 6x6 0.75 to 0.83 4" SDR-35 PVC 6x8 or 8x6 0.84 to 1.11 4" SDR-35 PVC 6x10 or 10x6 1.12 to 1,39 6" SDR-35 PVC 6x12 or 12x6 1.40 to 1.67 6" SDR-35 PVC Notes: 1. All boxes are a standard 3.5 fee^de£tlx(irwtoJ|2 2. A standard SDR-35 PVC pipe coupling is cast into the wall for easy connection to discharge drain 3. Dimensions shown are internal. Please add 1' to each' external (using 6" walls) 4. In line with TRSS data, for Commercial Developments a minimum (runoff coefficient) C factor of 0,85 is recommended. For Residential Developments, use of C factors less than 0.5 require individual site review by Filterra, 5. Please ask for Sizing Tables for other target treatment goals, e g, 0,3 in/hr 6. This sizing table is valid only for CA, NV AZ, OR, ID, AK & HI www.filterra.com GRADING AND GUTTER FLOW CURB {lYP) GUTTER FLOW TO BYPASS GUTTER FLOW FROM CONTRIBUTING DRAINAGE AREA GUTTER FLOW GRADING AND CURB AND GUTTER SHOULD BE SUCH THAT GUTTER FLOW APPROACHES THE FILTERRA FROM ONE SIDE OF THE THROAT AND FLOWS AWAY FROM THE FILTERRA ON THE OPPOSITE SIDE DURING EXTREME STORM EVENTS. DESIGN OR INSTALLATION SUCH THAT FLOW APPROACHES FROM BOTH SIDES WILL RESULT IN SITE MAINTENANCE ISSUES AND VOID MANUFACTURER'S MAINTENANCE PROGRAM AND WARRANTY. INCORRECT MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITFEN AUTHORIZATION FROM FILTERRA CORRECT Copyrighl iD 2007 by Americasi DATE: 12-21-04 DWG: GUI FILTERRA® GUIDELINES GRADING AND GUTTER FLOW us PAT 6,277,274 AND 6.569.321 AVOID "HEAD-ON" GUTTER FLOW PROBLEM FLOW FROM THE ADJACENT GUTTER HITS THE FILTERRA "HEAD-ON". THIS CAN CAUSE SYSTEM DAMAGE (MEDIA EROSION OR SUSPENSION). REGARDLESS OF WHETHER BYPASS IS PROVIDED THIS IS A PROBLEM SCENARIO. GUTTER FLOW SHOULD APPROACH THE FILTERRA PARALLEL TO THE THROAT SO THAT WATER FLOWS IN A LINEAR PATTERN IN FRONT OF THE THROAT. DURING EXTREME STORM EVENTS. EXCESS WATER SHOULD CONTINUE TO FLOW IN FRONT OF THE FILTERRA TO A BYPASS INLET OR OTHER RELIEF. POSSIBLE SOLUTIONS MODIFICATIONS OF DRAWINGS ARE ONLY PERMITfED BY WRITTEN AUTHORIZATION FROM FILTERRA Copyrighl © 2007 by .\merica5T DATE: 12-22-04 DWG: GU2 FILTERRA® GUIDELINES AVOID "HEAD-ON" GUTTTER FLOW us PAT 6,277,274 AND 6.569,321 PARKING LOT CORNERS FILTERRA ELEV 'A' MUST BE HIGHER THAN ELEV 'B' IN ORDER TO ACHIEVE THE NECESSARY CROSS UNEAR FLOW TO BYPASS INTENDED DRAINAGE AREA REOUIRED _ CROSS LINEAR A* FLOW y PLACEMENT STORM J- DRAIN y INLET o — —- PAVED AREA PROBLEM .FLOW EL£V "A" MUST BE HIGHER THAN ELEV 'B* IN ORDER TO ACHIE\€ THE NECESSARY BYPASS FLOW RLTERRA STORM y- DRAIN INLET o RESULTING CONTRIBUTING DRAINAGE AREA IS MOST UKELY ONLY WHAT IS CAPTURED AND RETAINED IN THE DEPTH OF THE CURB AND GUTTER PLACEMENT PROBLEM MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATiON FROM FILTERRA POSSIBLE PLACEMENT SOLUTIONS Copyright © 2007 by Americasi DATE: 12-14-04 DWG: GU3 FILTERRA® GUIDELINES PARKING LOT CORNERS 1 us PAT 6,277,274 AND 6,569,321 Sioreteniioii Systems Section B Filterra® Plans, Placement & Grading Scenario Ideas to Ensure Maximum Efficiency & Minimum Space Used Toll Tree: (S66]34Q-345fi Fax:(951) .^=^9-3439 desiGii i/.filter!7t.cofn www.filferrii.com J c RLTERRA CURB INLET RLTERRA LOW POINTS AT 2 SIDES RLTERRA CURB INLET " RLTERRA RLTERRA jsp- CURB INLET RLTERRA y-j r •h— RLTERRA -~- CURB INLET RLTERRA LOW POINTS AT 4 CORNERS ARROWS INDICATE DIRECTION OF SURFACE DRAINAGE FLOW RLTERRA LOW LOW MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA J c CURB INLET RLTERRA RLTERRA CURB INLET RLTERRA LOW POINTS AT 2 CORNERS Copyrighl C 2007 by Americas! DATE: 01-03-05 DWG: PLGl FILTERRA® EXAMPLE SCENARIOS TYPICAL PARKING LOT APPLICATIONS US PAT 6,277,274 AND 6.569.321 TO BYPASS REUEF LOWER 3 ELEVATION CURB Cl/T \ HIGHER ELEVATION CURB CUT PAVED AREA CONCRETE OR PAVED aUME PARKING LOT ISLAND TT1R0AT CURB CTYP) \^ PAVED \4 AREA CAST-IN-PLACE FLUME & GUTTER DOWEL PRECAST ^ RLTERRA —^ . BOX WALL * FLUME (SLOPED TOWARD RLTERRA THROAT) 4" MIN 6" MAX CURB GUTTER TRANSmON TO PROVIDE POSmVE DRAJNAGE TO THROAT OPENING SECTION VIEW OF FILTERRA THROAT AND FLUME ON-GRADE ISLAND IN OPEN PARKING LOT PAVED AREA CURB / CURB -i CUT PARKING LOT ISLAND o CURB CUT PAVED AREA RLTERRA UNPF CURB INLET (LOW POINT) CONCRETE OR PAVED FLUME 7 RLTERRA UNIT PAVED TO AREA BYPASS REUEF RLTERRA UNIT PARKING LOT ISLAND 7 FLOW CURB CUT PAVED * AREA CURB / (TYP) THROAT CONCRETE OR PAVED FLUME LOW POINT ISLAND AT SIDE OF PARKING LOT ON-GRADE ISLAND AT SIDE OF PARKING LOT MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA Copyright e 2007 by Americast DATE: 01-03-05 DWG: PLG2 FILTERRA® EXAMPLE SCENARIOS PARKING LOT ISLAND APPLICATIONS e US PAT 6.277,274 AND 6,569,321 PAVED AREA CROWNED CONCRETE OR PAVED FLUME PRECAST RLTERRA TOP SLAB (PtP) FLUME (CROWNED AND SLOPED TOWARD RLTERRA THROATS) RLTERRA THROAT OPENING (TYP) CURB (TYP) RLTERRA UNIT PRECAST RLTERRA BOX WALL (TYP) SECTION VIEW OF CROWNED FLUME CROWNED FLUME CORNER FLUME (SLOPED TOWARD RLTERRA THROAT) MIN MAX CURB CAST-IN-PLACE FLUME ic GUTTER GUTTER TRANSFTION TO PROVIDE POSITIVE DRAINAGE TO THROAT OPENING THROAT CONCRETE OR PAVED FLUME SECTION VIEW OF FILTERRA THROAT AND FLUME LOW POINT PAVED AREA THROAT CONCRETE OR PAVED FLUME TWO FLUME CORNER RLTERRA UNrr CURB t FLOW (TTP) LOW POINT THROAT CONCRETE OR PAVED FLUME STORM DRAIN INLET ONE FLUME CORNER DATE: 01-03-05 DWG: PLG3 FILTERRA® EXAMPLE SCENARIOS PARKING LOT CORNER APPLICATIONS us PAT 6.277.274 AND 6.569,321 RLTEl II^IIIH^IIIII^ GRASS SWALE BYPASS FLOW DIRECTED TO •A LOWER POINT OF REUEF CONCRETE CURB (TYP) (BY OTHERS) OUTLET PIPE (BY OTHERS) TO APPROPRIATE OUTFALL FLOWUNE OF SWALE SLOPED DOWN TO A AN APPROPRIATE ETYPASS AT A LOWER ELEVATION THAN ELEV 'A' CONCRETE SWALE AND TRANSITION AT RLTERRA (BY OTHERS) PLAN VIEW CAST IN PLACE GUTTER TRANSmON (BY OTHERS) CAST IN PLACE CONCRETE SWALE (BY OTHERS) MIN 4"/MAX 6" THROAT OPENING CAST IN PLACE CONCRETE GUTTER AT THROAT OPENING (BY OTHERS) SECTION VIEW AT FILTERRA aOWUNE OF SWALE ON EITHER SIDE OF FILTERRA DRAWING AVAILABLE IN TIF FILE FORMAT. Copyright O 2005 by America*! DATE: 03-10-05 DWG: FTSWL-1 PRECAST FILTERRA® UNIT TYPICAL SWALE CONFIGURATION us PAT 6,277,274 AND 6,569.321 SDR-35 PVC COUPLING CAST INTO PRECAST BOX WALL (OUTLET PIPE LOCATION VARIES) INTERNAL PERFORATED PIPING INCLUDED WITH FILTERRA UNIT FILTERRA STORMWATER TREATMENT SYSTEM AS PROVIDED BY AMERICAST (REFER TO PRECAST FILTERRA UNIT DRAWINGS FOR DETAILS NOT SHOWN). INFILTRATION BYPASS TO APPROPRIATE OUTFALL - POTENTIALLY THROUGH OTHER INFILTRATION CELL(S) TOP OF INFILTRATION CELL(S) TO BE AT A LOWER ELEVATION THAN BOTTOM OF FILTERRA UNIT PERFORATED PIPING WITHIN THE UMITS OF THE INFILTRATION CELL SECTION VIEW REMOTE INFILTRATION CELL SDR-35 PVC COUPUNG CAST INTO PRECAST BOX WALL (OUTLET PIPE LOCATION VARIES) FINISHED GRADE INTERNAL PERFORATED PIPING INCLUDED WITH FILTERRA UNIT OPTIONAL OBSERVATION AND/OR CLEANOUT INFILTRATION CELL FILTERRA STORMWATER TREATMENT SYSTEM AS PROVIDED BY AMERICAST (REFER TO PRECAST FILTERRA UNIT DRAWINGS FOR DETAILS NOT SHOWN) OPTIONAL OBSERVATION AND/OR CLEANOUT INFILTRATION CELL TO BE DESIGNED FOR 2000 LBS/SQ FT UNIFORM BEARING CAPACITY PERFORATED PIPING WITHIN THE UMITS OF THE INFILTRATION CELL l_ INTERMEDIATE BRIDGING LAYER(S) AS NECESSARY INFILTRATION BYPASS TO APPROPRIATE OUTFALL - POTENTIALLY THROUGH OTHER INFILTRATION CELL(S) SECTION VIEW INFILTRATION CELL BENEATH FILTERRA MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIF FILE FORMAT Copyright © 2007 by Ameficasl DATE: 07-07-06 DWG: FTINF~2 PRECAST FILTERRA(R) FOR INFILTRATION APPLICATIONS ® us PAT 6.277.274 AND 6.569.321 L 4" SDR-35 GASKETED COUPUNG CAST INTO PRECAST WALL (LOCATION VARIES) 4" PVC OUTLET PIPE (BY OTHERS) CONNECT TO APPROPRIATE OUTFALL (LOCATION VARIES) PARKING LOT OR STREET MODIRED RLTERRA TOP SLAB CENTER OF 3X3 TREE GRATE SIDEWALK BOX SIZE DIM. "A" TREE GRATE 4X8 ic 6X8 9'-0" 3"x3* MODIFIED NARROW LENGTH 6X10 11'--0' 3x3' FILTERRA UNIT ONLY FOR 4X8 (SHOWN) 6X8 AND 6X10 BOXES 6" SDR-35 GASKETED COUPUNG CAST INTO PRECAST WALL 6" PVC OUTLET (LOCATION VARIES) PIPE (BY OTHERS) CONNECT TO APPROPRIATE OUTFAa (LOCATION VARIES) PARKING LOT OR STREET CENTER OF 4X4 FACE OF CURB TREE GRATE PLEASE NOTE MODIFICATION ON PROJECT INFORMATION FORM BOX SIZE DIM "A" DIM "B" TREE GRATE 8.5X4 & 8X4 5'-0" e'-o" 3*x3' 6X6 tc 6X6 7'-0" 9'-0" 3*x3' 10X6 & 12X6 7*-0" 9'-6" 4'x4'« STANDARD NARROW WIDTH FILTERRA UNIT SUITABLE FOR ALL STANDARD BOXES •3'x3* TREE GRATE IS OPTIONAL SIDEWW.K MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA Copyright €• 2007 by Amencast TOLL FREE (866] 349-345S DATE: 07-07-06 DWG: FTSC-2 TYPICAL FILTERRA® SIDEWALK CONFIPURATIONS item us PAT 6.277,274 AND 6,569.321 RLTERRA UNH" CURB (TYP) 4"» PIPE FROM RLTERRA TO STORM DRAJN PIPE FROM ROOF RUNOFF AL-== CONCRETE OR PAVED FLUME STORM DRAIN GRATE OUTFALL PIPE FROM STORM - , DRAIN GRATE ^^^•JA LOW POINT FLUME PLAN GRADE STANDARD CURB (TYP) PIPE FROM ROOF RUNOFF ELEV -A' MUST BE HIGHER THAN ELEV 'B' SLOPE FLUME FLOW PIPE OUTLET ELEVATION 'A' DEPRESSED AREA AT THROAT OPENING (TYP) ELEV 'B- MUST BE HIGHER THAN ELEV 'C FLUME aow FILTERRA FLOWLINE ELEV 'B' 7 GRATE DRAIN FLOWLINE ELEV 'C FLUME CROSS SECTION A-A FLUME (SLOPED TOWARD RLTERRA THROAT) 4' MIN 6" MAX CURB CAST-IN-PLACE FLUME & GUTTER FLUME SECTION B-B JTTER TT?ANSmON TO PROVIDE POSmvE DRAINAGE TO THROAT OPENING MODIFICATIONS OF DRAWINGS ARE ONLY PERMIHED BY WRITTEN. AUTHORIZATION FROM FILTERRA Copyright © 2007 by Aniencast DATE:" 03-17-05 DWG: FTRDF-1 FILTERRA® EXAMPLE SCENARIOS ROOF DRAIN FLUME APPLICATION ® us PAT 6.277,274 AND 6,569.321 B i 0 r e I e n 1 i 0 rj S V s "L e rn s Section C Standard Filterra® Detail Drawings & Filterra® Plan Notes For TIF versions of these detail drawings, please contact Americast. Toll Free: (866) 349-3458 E-mail: design@filterra.com Reproduction of these detail drawings is permitted for use only in site plans or contract documents for eventual supply by Americast or its authorized dealer. Other uses are prohibited and may infringe copyright or patent protection laws. Filterra and Americast reserve the right to alter specifications without notice. Please make certain the Filterra Project Information Fonn is completed to ensure the verification of the latest specifications for your project. Toil Free: (866i 349^^45^ Fax: (951) 359-34,^) desi"n'rt.:liken"a,coii; www.filterra.com FILTERRA CURB INLET tULLUC„ LLl_l_l_l_il _1_ULLL -LLLL i STANDARD CURB AND GUTTER (TYP) GUTTER FLOW TRANSITION FROM STANDARD TO DEPRESSED GUTTER (TYP) PLAN VIEW SLOPE ELEV A' MUST BE HIGHER THAN ELEV B' DEPRESSED GUTTER AT THROAT OPENING (TYP) |i^006<XX>6C\\V\\\V<.K''^s?^ CURB INLET THROAT GUTTER aow FILTERRA FLOWLINE ELEV 'A' BYPASS CURB INLET FLOWLINE.ELEV 'B' ELEVATION VIEW INTERLOCKING JOINT (TYP) FILTERRA UNIT STORMWATER STRUCTURE PERFORATED UNDERDRAIN SYSTEM BY AMERICAST STORMWATER STRUCTURE EFRUENT IN (MUST BE LOWER) CROSS SECTION MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA ^^^5^^ Copyright 2007 by Americasi DATE: 07-07-06 DWG: FLP-2 FILTERRA® TYPICAL FLOWLINE AND OULET PIPE RELATIONSHIP us PAT 6.277,274 AND 6,569,321 CROWNED FLUME PRECAST RLTERRA TOP SLAB (TYP) •<&f!y'T^7-^<^i-'i:iii 4-6" OPENIN PRECAST FILTERRA BOX WALL OYP) FLUME - SLOPED TOWARDS FILTERRA THROAT RLTERRA THROAT OPENING PRECAST RLTERRA TOP SLAB mmm -6" OPENING 4-6" RLTERRA f THROAT OPENING CURB CAST-IN-PLACE ^J-v, FLUME ic GUTTER JJUiL (CROWNED AND SLOPED * TOWARD FILTERRA THROATS) DOWEL (TYP) CAST-IN-PLACE aUME ic GUTTER (SLOPED TOWARD RLTERRA THROAT) PRECAST RLTERRA BOX WALL SECTIONS VIEWS OF FILTERRA IN TYPICAL FLUME APPLICATIONS SEE BELOW FOR DETAILS NOT SHOWN STANDARD 90* NOSING (OTHER NOSING AVAILABLE UPON REQUEST) 4-6" CLEAR THROAT OPENING PRECAST TOP SLAB CAST-IN-PLACE DEPRESSED GUTTER AND THROAT OPENING (BY CONTRACTOR) #4 DOWEL BARS © 12" O.C. BY AMERICAST TO BE BENT AS NECESSARY BY CONTRACTOR PRIOR TO INSTALLATION OF FIELD POURED GUTTER PRECAST BOX WALL SECTION VIEW STANDARD FILTERRA THROAT OPENING THROAT PROTECTION DEVICE DO NOT REMOVE - LEAVE IN PLACE UNTIL SITE IS STABILIZED AND FILTERRA IS ACTIVATED IMPORTANT FILTERRA FLOWLINE MUST BE AT A HIGHER ELEVATION THAN BYPASS FLOWLINE (DROP INLET DR •THER) MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIFF FILE FORMAT Copyright © 2007 by Americasi DATE: 02-27-06 DWG: CGT-4 FILTERRA(s) THROAT OPENING AND GUTTER OR FLUME DETAIL mi us PAT 6,277,274 AND 6,569,321 Bioreteniion, Svstems Filterra® Standard Plan Notes Construction & Installation A. Each unit shall be constructed at the locations and elevations according to the sizes shown on the approved drawings. Any modifications to the elevation or location shall be at the direction of and approved by the Engineer. B. If the Filterra® is stored before installation, the top slab must be placed on the box using the 2x4 wood provided, to prevent any contamination from the site. All internal fittings supplied (if any), must be left in place as per the delivery. C. The unit shall be placed on a compacted sub-grade with a minimum 6-inch gravel base matching the final grade ofthe curb line in the area of the unit. The unit is to be placed such that the unit and top slab match the grade ofthe curb in the area of the unit. Compact undisturbed sub-grade materials to 95% of maximum density at +1- 2% of optimum moisture. Unsuitable material below sub-grade shall be replaced to the site engineer's approval. D. Outlet connections shall be aligned and sealed to meet the approved drawings with modifications necessary to meet site conditions and local regulations. E. Once the unit is set, the intemal wooden forms and protective mesh cover must be left intact. Remove only the temporary wooden shipping blocks between the box and top slab. The top lid should be sealed onto the box section before backfilling, using a non-shrink grout, butyl rubber or similar waterproof seal. The boards on top of the lid and boards sealed in the unit's throat must NOT be removed. The Supplier (Americast or its authorized dealer) will remove these sections at the time of activation. Backfilling should be performed in a careful manner, bringing the ap- propriate fill material up in 6" lifts on all sides. Precast sections shall be set in a manner that will result in a watertight joint. In all instances, installation of Filterra® unit shall conform to ASTM specification C891 "Standard Practice for Installation of Underground Precast Utility Structures", unless directed otherwise in contract documents. F. Curb and gutter construction (where present) shall ensure that the flow-line of the Filterra® units is at a greater elevation than the flow-line of the bypass sti'ucture or relief (drop inlet, curb cut or similar). Failure to comply with this guideline may cause failure and/or damage to the Filterra® environmental device. G. Each Filterra® unit must receive adequate irrigation to ensure survival of the living system during periods of drier weather. This may be achieved through a piped system, gutter flow or through the tree grate. www.filterra.com Bioretention Systems Activation A. Activation of the Filterra® unit is performed ONLY by the Supplier. Purchaser is responsible for Filterra® inlet protection and subsequent clean out cost. This process cannot commence until the project site is fully stabilized and cleaned (full landscaping, grass cover, final paving and street sweeping completed), negating the chance of construction materials contaminating the Filterra® system. Care shall be taken during construction not to damage the protective throat and top plates. B. Activation includes installation of plant(s) and mulch layers as necessary. Included Maintenance A. Each correctly installed Filterra® unit is to be maintained by the Supplier, or a Supplier approved contractor for a minimum period of 1 yean The cost of this service is to be included in the price of each Filterra® unit. Extended maintenance contracts are available at extra cost upon request. B. Annual included maintenance consists of a maximum of (2) scheduled visits. The visits are scheduled seasonally; the spring visit aims to clean up after winter loads that may include salts and sands. The fall visit helps the system by removing excessive leaf litter. C. Each Included Maintenance visit consists of the following tasks. 1. Filterra® unit inspection 2. Foreign debris, silt, mulch & trash removal 3. Filter media evaluation and recharge as necessary 4. Plant health evaluation and pruning or replacement as necessary 5. Replacement of mulch 6. Disposal of all maintenance refuse items 7. Maintenance records updated and stored (reports available upon request) D. The beginning and ending date of Supplier's obligation to maintain the installed system shall be determined by the Supplier at the time the system is activated. Owners must promptly notify the Supplier of any damage to the plant(s), which constitute(s) an integral part of the bioretention technology. www.filterra.coni INLET SHAPING (BY OTHERS) SDR-35 PVC COUPUNG CAST INTO PRECAST BOX WALL BY AMERICAST (OUTLET PIPE LOCATION VARIES) CURB (BY OTHERS) PLAN VIEW CLEANOUT COVER CAST IN TOP SLAB TOP SLAB INTERLOCKING JOINT (TYP) TREE FRAME & GRATE CAST IN TOP SLAB PLANT AS SUPPUED BY AMERICAST (NOT SHOWN FOR CLARITY) GALVANIZED ANGLE NOSING CURB AND GUTTER (BY OTHERS) STREET DOWEL BARS 12" O.C. MULCH PROVIDED BY AMERICAST UNDERDRAIN STONE PROVIDED BY AMERICAST FILTER MEDIA PROVIDED BY AMERICAST SECTION A-A PERFORATED UNDERDRAIN SYSTEM BY AMERICAST DESIGNATION L w TREE GRATE QTY & SIZE OUTLET PIPE 4 X 6.5 4-0" 6'-6" (1) 5x3 4" SDR-35 PVC 4x8 4'-0" B'-O" (1) 3x3 4" SDR-35 PVC 6 X 8 6'-0" 8'-0" (1) 4x4 4" SDR-35 PVC 6 X 10 6-0" lO'-O" (1) 4x4 6" SDR-35 PVC 6 X 12 6-0" 12'-0" (2) 4x4 6" SDR~35 PVC MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIF FILE FORMAT. Copyrighl © 2007 by Americas! DATE: 07-07-06 DWG: FTNL-2 PRECAST FILTERRA® UNIT NARROW LENGTH CONFIGURATION filterra' us PAT 6,277,274 AND 6,569,321 INLET SHAPING (BY OTHERS) SDR-35 PVC COUPUNG CAST INTO PRECAST BOX WALL BY AMERICAST (OUTLET PIPE LOCATION VARIES) CURB (BY OTHERS) PLANVIEW TREE FRAME & GRATE CAST IN TOP SLAB CLEANOUT COVER CAST IN TOP SLAB TOP SLAB INTERLOCKING JOINT (TYP) PLANT AS SUPPUED BY AMERICAST (NOT SHOWN FOR CLARITY) GALVANIZED ANGLE NOSING CURB AND GUTTER (BY OTHERS) STREET DOWEL BARS 12" O.C. UNDERDRAIN STONE PROVIDED BY AMERICAST MULCH PROVIDED BY AMERICAST FILTER MEDIA PROVIDED BY AMERICAST PERFORATED UNDERDRAIN SYSTEM BY AMERICAST SECTION A-A DESIGNATION L W TREE GRATE QTY & SIZE OUTLET PIPE 6x6 6-0" 6'-0" (1) 3x3 4" SDR-35 PVC DRAWING AVAILABLE IN TIF FILE FORMAT. ^^^^ Copyright <Si 2004 by Ame nc asl mm DATE: 07-07-06 DWG: FTST-2 PRECAST FILTERRA® UNIT STANDARD CONFIGURATION us PAT 6.277.274 AND 6,569.321 SDR-35 PVC COUPUNG CAST INTO PRECAST BOX WALL (OUTLET PIPE LOCATION VARIES) TREE FRAME & GRATE CAST IN TOP SLAB TOP SLAB INTERLOCKING JOINT (TYP) INLET SHAPING (BY OTHERS) CLEANOUT COVER CAST IN TOP SLAB CURB (BY OTHERS) PLANT AS SUPPUED BY AMERICAST (NOT SHOWN rAiwAMivrn FOR rlARlTY^ ^GALVANIZED FOR CLARITY) /- ^^g^E NOSING CURB AND GUTTER (BY OTHERS) STREET MULCH PROVIDED BY AMERICAST UNDERDRAIN STONE PROVIDED BY AMERICAST DOWEL BARS 12" O.C. FILTER MEDIA PROVIDED BY AMERICAST PERFORATED UNDERDRAIN SYSTEM BY AMERICAST SECTION A-A DESIGNATION L W TREE GRATE QTY & SIZE OUTLET PIPE 6.5 X 4 6'-6" 4'-0" (1) 3x3 4" SDR-35 PVC 8x4 S'-O" 4'-0" (1) 3x3 4" SDR-35 PVC 8x6 S'-O" 6'~0" (1) 4x4 4" SDR-35 PVC 10 X 6 lO'-O" 6'~0" (1) 4x4 6" SDR-35 PVC 12 X 6 12'-0" 6'-0" (2) 4x4 6" SDR-35 PVC MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIF FILE FORMAT. Copyright e 3007 by .Americast DATE: 07-07-06 DWG: FTNW-2 PRECAST FILTERRA(g) UNIT NARROW WIDTH CONFIGURATION fiterri us PAT 6.277,274 AND 6,569,321 CONNECTION TO SOAKER/SWEAT HOSE OR SPRINKLER HEAD (BY OTHERS) TOP OF CURB IRRIGATION/SPRINKLER PIPE (BY OTHERS) 2" PVC CONDUIT PRECAST INTO CENTER OF EACH BOX WALL TOP SLAB APPROX 12.5" MULCH LAYER BY AMERICAST ELEVATION VIEW CONNECTION TO SOAKER/SWEAT HOSE OR SPRINKLER HEAD (BY OTHERS) IRRIGATION/SPRINKLER PIPE (BY OTHERS) UNIT SIZE A B 4 X 6.5 2-6" 3'-9" 4x8 2-6" 4'-6" 6.5 X 4 3*-9" 2'-6" 6x6 3'-6'' 3'-6" 6x8 3-6" 4'-6" 6 X 10 3"-6" 5'-6" 6 X 12 3'-6" 6'-6" 8x6 4'-6" 3'-6" 8x6 4'-6" 3'-6" 10 X 6 5-6" 3"-6" 12x6 6'-6" 3-6" 36" OR 48" TREE GRATE 2" PVC CONDUIT PRECAST INTO r CENTER OF EACH BOX WALL FACE OF CURB DRAWING AVAILABLE IN TIF FILE FORMAT. FILTERRA THROAT OPENING PLAN VIEW to MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA Copyright 1' 2007 by Americasi DATE: 08-09-06 DWG: FTIRR-1 FILTERRA® IRRIGATION PLANNING LAYOUT us PAT 6.277,274 AND 6,569,321 iiorctoiiMon Systems Section D Filterra® Technical Section Toll Free: (8661 349-3458 Fax: (95]} 3^59-3439 desi mvti',,fi[lL^rra,com www.filterra.com Americast Filterra® Weights and Lifting Details WESTERN ZONE Box Only UD Stone -t- Media Top Only Box + Top Box + Media Box + Media + Top ^Spreader Bar Pounds Tons Pounds Tons CY Pounds Tons Pounds Tons Pounds Tons Pounds Tons Min Max 4'-a" Throat 4x6.5 4x8 8,396 9,145 4.20 4.57 5,598 6,890 2.80 3.44 2.17 2.67 3,178 3,829 1.59 1.91 11,574 12,974 5.79 6.49 13,994 16,035 7.00 8.02 17,171 19,864 8.59 9.93 5.08 ft 5.00 ft 7,58 ft 7.50 ft Throat 6,5x4 Std 6x6 6x8 6x10 6x12 8,186 9,300 11,315 13,330 16,201 4.09 4.65 5.66 6.67 8.10 5,598 7,751 10,334 12,918 15,502 2.80 3.88 5.17 6.46 7.75 2.17 3.00 4.00 5.00 6.00 3,151 4,221 5,121 6,545 6,997 1.58 2.11 2.56 3.27 3.50 11,337 13,521 16,436 19,875 23,197 5.67 6.76 8.22 9.94 11.60 13,784 17,051 21,649 26,248 31,702 6.89 8.53 10.82 13.12 15.85 16,935 21,272 26,771 32,793 38,699 8.47 10.64 13.39 16.40 19.35 5,58 ft 7.00 ft 7.00 ft 7.00 ft 7.08 ft 7.58 ft 9.00 ft 9.00 ft 9.00 ft 9.08 ft 8'-0" Throat 8x4 8x6 8,835 11,160 4.42 5.58 6,890 10,334 3.44 5.17 2.67 4.00 3,787 5,100 1.89 2.55 12,622 16,260 6.31 8.13 15,725 21,494 7.86 10.75 19,511 26,594 9,76 13.30 5,50 ft 7.50 ft 7.50 ft 9.50 ft 10"-0" Throat 10x6 13,020 6.51 12,918 6.46 5.00 6,503 3.25 19,523 9.76 25,938 12.97 32,441 16.22 7,50 ft 9.50 ft 12'-D" Throat 12x6 15,697 7,85 15,502 7.75 6.00 6,933 3.47 22,630 11.31 31,199 15.60 38,131 19.07 7.58 ft 9,58 ft THE TOP AND BOX MUST BE LIFTED SEPERATELY A 7.50 ft spreader bar is suitable for all sizes shown and is always needed for safe lifting of all box sizes. 4/24/2007 4X6.5B 4X8B \7M///77777/. V7/7777/M7A 8X6B '//777777777M777/7777777A 7^ 8X4B V7///////\r///////y7 6X8B V77//////m/7/////'/A 6X10B MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA 6.5X4B mzzzzmxzzzzzzm 6X6B 6X12B V/M///y'/////7777Z, /^//////////y/m^A 12X6B DRAWING AVAILABLE IN TIF FILE FORMAT. Copyright © 2007 by .Americast DATE: 01-05-06 DWG: FTOPC-1 FILTERRA® PVC OUTLET PIPE COUPLING LOCATIONS us PAT 6,277,274 AND 6,569.321 Filterra® Piping Technical Details oretention Systems Filterra® is supplied with an internal underdrain system that exits a wall in a perpendicular direction. Most efficient drainage is accomplished when the drain exits on the lower side of the Filterra®, i.e. nearest the overflow bypass. This is more important when using the larger sized Filterras®. PRECAST FILTERRA BOX WALL -. SDR-35 PVC OUTFALL PIPE AT MIN 0,50% SLOPE TO OUTFALL (BV OTHERS) PRECAST FILTERRA BOX BASE - SDR-35 PVC COUPUNG CAST INTO PRECAST BOX WALL (BY AMERICAST) INTERNAL FILTERFJA r- UNDERDRAIN SYSTEM / (BY AMERICAST) OOOO Drawing DPI: Section View through Filterra Precast Box Wall at Outfall Pipe Connection All units are supplied with the drainage pipe coupling precast into the wall, at a depth of 3.50 feet (INV to TC). Drawing DPI is a detail of the coupling. The coupling used is SDR-35 PVC. Typically, a minimum slope of 0.50% is adequate to accommodate the flow of treated water from the Filterra®, but each site may present unique conditions based on routing of the outfall pipe (elbows). The pipe must not be a restricting point for the successful operation of Filterra®. Ali connecting pipes must accommodate freefall flow. Table 3 lists expected flow rates of the various size Filterra® units and these flow rates can be used to confirm or calculate the minimum outfall pipe slope. Table 3: Filterra Flow Rates & Pipe Details Filterra® Size (feet) Expected Flow Rate (cubic feet/second) Connecting Drainage Pipe 4x6.5 or 6.5x4 0.061 4" SDR-35 PVC 4x8 or 8x4 0.075 4" SDR-35 PVC 6x6 0.084 4" SDR-35 PVC 6x8 or 8x6 0.112 4" SDR-35 PVC 6x10 or 10x6 0.140 SDR-35 PVC 6x12 or 12x6 0.168 6" SDR-35 PVC www.fiiterrii.com d Bioretention Systems Filterra® Modified Options: Recessed Tops Modified recessed top wilh mulch Filterra* modified recessed tops allow a seamless integration using pavers, mulch or sod. NOTE: Modified recessed lops increase the depth ofthe I 'illcrra' in\ crl oul. Modified recessed top prior to shipping CLEANOUT FRAME (Sc COVER TREE GRATE & STEEL FRAME ' ri =AN \ ^ 10-12" \ » 1 \ — f ^ . ' B ^ b t. fi, , — \ ^ 10-12" \ » 1 \ — f ^ . ' * B ^ b t. fi, , — vvww.filterra.coni Bioretention Systems Filterra^ Modified Options: Ornamental Grates Modified colored grates are plastic coated to reduce corrosion. All grates are available in 36" and 48". Some modified grates may not be ADA compliant. For additional options piease call (866) 349-3458, FT Radial Color Choices: • Black • Green FT New Orleans Color Choices: • Black • Green UA Standard Flal UA Tille-24 UA OT Tille- 24 UA Chinook vvww.filtcrra.com Common Filterra® Placements Bioretention System; Providing aesthetics and treatment in a residential area. Typical Filterra placement at a fast food chain. Even the largest Filterra unil blends in wilh landscaping. Filterra used wilh a flumed bypass in a commercial parking lol. Ideal for stormwater treatment where space is tight. High flows bypass Filterra into a grass swale. vvww.liUerra.coin Filterra " Plant Selections fiiterrd Bioretention Systems The Filterra* Stormwater Bioretention Filtration Sysiem harnesses the power of nature to capture, immobilize and cycle pollutants to treat stormwater runoff. Trees, grasses and shrubs do more than make it attractive: they also enhance pollutant removal. Above ground, the system's shrubs, grasses or trees add beauty and value to the urban landscape. Underground, nature's complex physical, chemical and biological processes are hard at work removing a wide range of non-point source pollutants from treated stormwater. Pollutants are decomposed, volatilized and incorporated into the biomass of Filterra's micro/macro fauna and flora. A wide range of plants are suitable for use in bioretention systeins. and a list is available indicating those suitable for use wilh FilleiTa. The selection varies by location according lo climate. Additional photos are available at www.filterra.com. Some of the most popular selections lo date are shown below: Filterra*' wilh Heavenly Bamboo Filterra* wilh Foster I lolly - ^-1- , •.••'.'9rvf .... , , Filterra* with Yedda Hawthorn Filterra* with Crape Myrtle www.filterra.com New or Existing Catch Basin, Curb Cut or Other Means of Overflow Relief Curb and Gutter A Growing Idea in Stomiwater Filtration. U,S. Patent #6,277,274 #6,569,321