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Home My WebLink AboutCT 02-14; BRESSI RANCH RESIDENTIAL PA6; WATER QUALITY TECHNICAL REPORT; 2004-03-01WATER OUALITY TECHNICAL REPORT BRESSI RANCH RESIDENTIAL PLANNING AREA 6 CITY OF CARLSBAD, CA MARCH 2004 PROJECTNUMBER: CT 02-14(1) DRAWING NUMBER: 411-3A Prepared For: GREYSTONE HOMES 1525 Faraday, Suite 300 Carlsbad, CA 92008 PROJECTDESIGN CONSULTANTS PlANNISG • EWIRONSfENTAl • ENGINEERING • SURVEY/CPS 701 B Street, Suite 800, San Diego, CA 92101 619-235-6471 FAX 619-234-0349 Job No. 2407.40 WATER OUALITY TECHNICAL REPORT BRESSI RANCH RESIDENTIAL PLANNING AREA 6 CITY OF CARLSBAD, CA MARCH 2004 PROJECT NUMBER: CT 02-14(1) DRAWING NUMBER: 411-3A Prepared For: GREYSTONE HOMES 1525 Faraday, Suite 300 Carlsbad, CA 92008 PROJECTDESIGN CONSULTANTS PLANNING . EKVIRONMENTAI • ENGINEERING • SVRVEY/GPS 701 B Street, Suile 800, San Diego, CA 92101 619-235-6471 FAX 619-234-0349 Job No. 2407.40 Kilgore,PJ RCE 46692 on Expires06/30/07 TABLE OF CONTENTS 1. INTRODUCTION 1 2. PROJECT DESCRIPTION 2 3. POLLUTANTS AND CONDITIONS OF CONCERN 3 Anticipated and Potential Pollutants from the Project Area 3 Pollutants of Concern in Receiving Waters 3 Conditions of Concem 5 4. STORM WATER BEST MANAGEMENT PRACTICES 7 Site Design BMPs 7 Source Control BMPs 7 Project-Specific BMPs 9 Structural Treatment BMPs 9 BMP Plan Assumptions 16 5. PROIECT BMP PLAN IMPLEMENTATION 17 Construction BMPs 17 Recommended Post-Construction BMP Plan 17 Operation and Maintenance Plans 18 6. PROJECT BMP COSTS AND FUNDING SOURCES 19 TABLES Table 1. Anticipated Conditions - Anticipated Pollutants and Sources 3 Table 2. Beneficial Uses for Inland Surface Waters 4 Table 3. Beneficial Uses for Groundwater 4 Table 4. Structural BMP Selection Matrix 10 Table 5. BMP Design Criteria 16 Table 6. Post-Construction BMP Summary 18 Table 7. BMP Costs 19 APPENDICES 1. Storm Water Requkements Applicability Checklist 2. Project Maps 3. Drainage Calculations 4. Supplemental BMP Information 5. References 1. INTRODUCTION This Water Quality Technical Report (WQTR) was prepared to define recommended project Best Management Practice (BMP) options that satisfy the requirements identified in the following documents: • City of Carlsbad Standard Urban Storm Water Mitigation Plan, Storm Water Standards, • County of San Diego Watershed Protection, Storm Water Management and Discharge Control Ordinance (County Ordinance), • Standard Specifications for Public Works Construction, • NPDES General Permit for Storm Water Discharges Associated with Construction Activity, and • San Diego Municipal NPDES Storm Water Permit (Order Number 2001-01). Specifically, this report includes the following: • Project description and location with respect to the Water Quality Control Plan for the San Diego Basin (Basin Plan); • BMP design criteria and water quality treatment flow and volume calculations; • Recommended BMP options for the project; • BMP device information for the recommended BMP options; and • Operation, maintenance, and funding for the recommended BMPs. wqtr-pa6.doc 2. PROJECT DESCRIPTION This WQTR is provided for Bressi Ranch Residential Planning Area 6. The project is located in the City of Carlsbad and is part of the Bressi Ranch development. The project site is bounded by Gateway Road to the north, Alicante Road to the west. Planning Area 15a to the east, and Town Garden Road to the south. The vicinity and site maps are available in Appendix 2. The total project site consists of 12.8 acres. The project consists of the construction of 63 single family homes and associated roadways, utilities, and landscaping. The project area currently consists of mass graded pads per the Bressi Ranch Mass Grading project. wqtr-pa6.doc 2- 3. POLLUTANTS AND CONDITIONS OF CONCERN Anticipated and Potential Pollutants from the Project Area Based on land use, potential pollutants from the site under existing conditions include sediment, nutrients, trash and debris, and pesticides. Anticipated pollutants from the site under proposed conditions include bacteria, sediment, nutrients, trash and debris, oil and grease, oxygen demanding substances, and heavy metals. TABLE 1. ANTICIPATED CONDITIONS - ANTICIPATED POLLUTANTS AND SOURCES Area Anticipated Pollutants Landscaped areas Sediment, nutrients, oxygen demanding substances, pesticides Rooftops Sediment, nutrients, trash and debris Parking/driveways Sediment, heavy metals, trash and debris, oil and grease General use Sediment, trash and debris, bacteria and vkuses Trash storage areas Sediment, trash and debris, bacteria and vkuses Pollutants of Concern in Receiving Waters The Bressi Ranch Residential Planning Area 6 Project is located in the Carlsbad Watershed (Hydrologic Unit 904.51) and is tributary to San Marcos Creek.' The sections below provide the beneficial uses and identification of impaired water bodies within the project's hydrologic area. Beneficial Uses The beneficial uses of the inland surface waters and the groundwater basins must not be threatened by the project. Tables 2 and 3 list the beneficial uses for the surface waters and groundwater within the project's hydrologic area. Water Quality Control Plan for the San Diego Basin, San Diego Regional Water Quality Control Board wqir-pa6.doc TABLE 2. BENEFICIAL USES FOR INLAND SURFACE WATERS Surface Water I^MUN .\GR IND RECl REC2 WILD San Marcos Creek + • • • • • TABLE 3. BENEFICIAL USES FOR GROUNDWATER Hydrologic Unit, Iiydrologic Area Ml N IM) 904.51 • • • Source: Water Quality Control Plan for the San Diego Basin, September 1994 Notes for Tables 2 and 3: • = Existing Beneficial Use o = Potential Beneficial Use + = Excepted fi-om Municipal MUN - Municipal and Domestic Supply: Includes use of water for community, military, or individual water supply systems including, but not limited to, drinking water supply. AGR - Agricultural Supply: Includes use of water for fanning, horticulture, or ranching including, but not limited to, irrigation, stock watering, or support of vegetation for range grazing. IND - • Industrial Services Supply: Includes use of water for industrial activities 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. RECl - Contact Recreation: Includes use of water for recreational activities involving bcxly 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 use of water for recreation 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, hunting, sightseeing, or aesthetic enjoyment in conjunction with the above activities. WARM - Warm Freshwater Habitat: Includes uses of water that support warm water ecosystems including, but not limited to, preservation or enhancement of aquatic habitats, vegetation, fish or wildlife, including invertebrates. 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 and food sources. wqtr-pa6.doc Impaired Water Bodies Section 303(d) of the Federal Clean Water Act (CWA, 33 USC 1250, et seq., at 1313(d)), requires States to identify and list waters that do not meet water quality standards after applying certain requked technology-based effluent limits (impaked water bodies). The hst is known as the Section 303(d) list of impaked waters. The proposed project is not dkectiy tributary to a 303(d) listed water body. The closest impaked water body is the Pacific Ocean Shorehne, San Marcos HA. The Pacific Ocean Shoreline, San Marcos HA is 303(d) listed for bacteria. In addition to the Section 303(d) list of impaired waters, the State of California also identifies waters of concern that may be included on the 303(d) list in the very near future. These waters have some indications that they are impaired, but there is currently insufficient data to meet the requkements for inclusion on the 303(d) list of impaked waters. This list is known as the Monitoring List (2002). The proposed project is not dkectiy tributary to a Monitoring List (2002) water body. The closest Monitoring List (2002) water body is the Aqua Hedionda Lagoon. The Aqua Hedionda Lagoon is Hsted for dissolved copper and selenium. Watershed Pollutants of Concem The proposed project is located within the Carlsbad Watershed. According to the Carlsbad Watershed Urban Runoff Management Program, the pollutants of concem for the Carlsbad Watershed are bacteria, diazinon, sediment, total dissolved soilds, and nutrients. Conditions of Concern A drainage study was conducted by a California Registered Civil Engineer (RCE) to identify the conditions of concern for this project. The drainage calculations are available in Appendix 3. Following is the summary of fmdings from the study: • Drainage Pattems: wqtr-pa6.doc -5 - Under existing conditions, runoff from the project area sheet flows to the southwest comer of the project and into a desilting basin before entering the backbone storm drain system for the Bressi Ranch development. The backbone storm drain system discharges into a detention basin before entering an unnamed creek which eventually reaches San Marcos Creek. Under proposed conditions, the storm water sheet flows to the west and into the onsite storm drain system. The onsite storm drain system connects into the backbone storm drain for the Bressi Ranch development. Soil Conditions and Imperviousness: The project area consists of soil group D. Under existing conditions, the project area is under 5% impervious and the runoff coefficient is 0.45. Under the proposed conditions, the project area will be 63% impervious and the overall runoff coefficient is expected to be 0.55. Rainfall Runoff Characteristics: Under existing conditions, the project area generates approximately 7.1 CFS (2-year storm) and 10.8 CFS (10-year storm) of storm water runoff Under the proposed conditions, the site will generate approximately 12.8 CFS (2- year storm) and 17.1 CFS (10-year storm) of storm water runoff Downstream Conditions: There is no expected adverse impact on downstream conditions as existing drainage pattems will be maintained. A detention basin at the south end of the Alicante Street storm drain will reduce the impact of the increase in storm water flows due to the development. The water quality will be improved by the development through the implementation of site design, source control, and treatment BMPs. The existing pipe's outfall is designed to protect against high velocity erosion in the proposed condition. wqtr-pa6.doc 6- 4. STORM WATER BEST MANAGEMENT PRACTICES The City Storm Water Standards Manual (Section III.2) requkes the implementation of apphcable site design, source control, project-specific, and structural treatment control BMPs. Site Design BMPs The following BMPs were considered in the project design process: • Reduce impervious surfaces, • Conserve natural areas, • Minimize dkectiy connected areas, and • Protect slopes and channels. Some of the specific site design BMPs incorporated into this project include: • Protect slopes and channels o All slopes will be stabilized with hydroseed or equivalent erosion control measures. o The outfalls are equipped with a D-41 energy dissipater and/or a riprap pad to prevent high velocity erosion. Source Control BMPs The following BMPs were considered in the project design process: • Inlet stenciling and signage, • Materials storage, • Trash storage, • Efficient irrigation, and wqtr-pa6.doc • Integrated pest management principles. Some of the specific source control BMPs incorporated into this project include: • Inlet StenciUng and signage 0 All inlets within the project boundaries will be stenciled or stamped with "No Dumping -1 Live Downstream," or as approved by the City Engineer. • Covered trash storage o All trash storage is covered due to the design of the standard-issue residential City of San Diego automated refuse containers. • Efficient irrigation o All Home Owners' Association (HOA) maintained landscaped areas will include rain shutoff devices to prevent irrigation during and after precipitation, and the irrigation will be designed for the area specific water requkements. Flow reducers and shutoff valves triggered by pressure drop will be used to control water loss from broken sprinkler heads or hnes. • Storm water education o Educational materials on storm water issues and simple ways to prevent storm water pollution will be made available to residents. • Integrated pest management principles o Residents and groundskeepers will be educated on pest management principles. o In HOA areas, only professional pest controllers will be used for the application of pesticides. Materials on how to control pests using non-toxic methods will be made available to maintenance personnel. wqir-pa6.doc Project-Specific BMPs The City Storm Water Standards Manual requkes specific BMPs if the project includes private roads, residential driveways and guest parking, dock areas, maintenance bays, vehicle and equipment wash areas, outdoor processing areas, surface parking areas, non-retail fueling areas, or steep hillside landscaping. The Bressi Ranch Residential Planning Area 6 Project has residential driveways and private roads. The City Storm Water Standards Manual Hsts five options for residential driveways and three options for private roads. The Bressi Ranch Residential Planning Area 6 Project does not include any of these options. However, the intent of the Storm Water Standards is to reduce the discharge of pollutants from storm water conveyance systems to the Maximum Extent Practicable (MEP statutory standard) throughout the use of a developed site. The Bressi Ranch Residential Planning Area 6 Project meets this objective by including treatment BMPs before discharging to the unnamed creek. Structural Treatment BMPs The selection of structural treatment BMP options is determined by the target pollutants, removal efficiencies, expected flows, and space availability. Table 4 is a selection matrix for structural treatment BMPs based on target pollutants and removal efficiencies. wqtr-pa6.doc TABLE 4. STRUCTURAL BMP SELECTION MATRIX Pollutant Categories Treatment Control BMP Categories Pollutant Categories Biofllters Detention Basins Infihration Basins^''* Wet Ponds or Wetlands Drainage Inserts Filtration Hydrodynamic Separator Systems^^^ Sediment M H H H L H H Nutrients L M M M L M L Heavy Metals M M M H L H L Organic Compounds U U U U L M L Trash & Debris L H U U M H H Oxygen Demanding Substances L M M M L M L Bacteria U U H U L M L Oil& Grease M M U u L H L Pesticides U U U u L U L Notes for Table 4: (1) Including trenches and porous pavement (2) Also known as hydrodynamic devices and baffle boxes L: Low removal efficiency M: Medium removal efficiency H: High removal efficiency U: Unknown removal efficiency The target pollutants for this project in order of general priority are sediment (with attached materials such as bacteria and viruses, nutrients, pesticides, and metals), oxygen demanding substances, trash and debris, and oil and grease. Based on the target pollutants and typical removal efficiencies, the treatment BMP options to consider include detention basins, infiltration basins, wet ponds, filtration and hydrodynamic separator systems. The soil characteristics and the onsite drainage pattems for Planning Area 6 make infiltration basins and wet ponds infeasible for this project. wqtr-pa6.doc 10- Detention Basins Detention basins (a.k.a. dry extended detention ponds, dry ponds, extended detention basins, detention ponds, extended detention ponds) are basins with controlled outlets designed to detain storm water runoff allowing particles and associated pollutants to settle. Detention basins may be designed to include vegetation, allowing for further pollutant removal through infiltration and natural pollutant uptake by vegetation. Detention basins are among the most widely applicable storm water management practices. They should be used for drainage areas of at least 10 acres, and they can be used with almost all types of soils and geology. Detention basins for improving water quality can also be designed and used as flood control devices. Based on the size of the Bressi Ranch development and proposed site plan, detention basins are a feasible option for treating the storm water runoff from this project. However, the detention basin for Bressi Ranch will not be used for water quality purposes since the basin was designed for detention purposes only. Filtration Systems Filtration systems include bioretention, sand and organic filters, and proprietary devices. Bioretention Bioretention areas are landscape features designed to provide treatment of storm water runoff These areas are typically shallow, landscaped depressions, located within small pockets of residential land uses. During storms, the runoff ponds above the mulch and soil of the bioretention system. The runoff filters through the mulch and soil mix, typically being collected in a perforated underdrain and retumed to the MS4. • National Menu of Best Management Practices for Storm Water Phase II, US EPA. wqtr-pa6xioc -11- Sand and Organic Filters For sand and organic filtration systems, there are five basic storm water filter designs: • Surface sand filter: This is the original sand filter design with the filter bed and sediment chamber placed aboveground. The surface sand filter is designed as an offline system that receives only the smaller water quality events. • Underground filter: This is the original sand filter design with the filter bed and sediment chamber placed underground. It is an offline system that receives only the smaUer water quality events. • Perimeter filter: This is the only filtering option that is an online system with an overflow chamber to accommodate large storm events. • Organic media filter: This is a slight modification to the surface sand filter, with the sand medium replaced with or supplemented by an organic medium to enhance pollutant removal of many compounds. • Multi-Chamber Treatment Train: This is an underground system with three filtration chambers designed to achieve very high pollutant removal rates. Proprietary Devices Proprietary filtration devices include offline filtration systems, online filter units, and filtration based inlet inserts. Proprietary catch basin insert devices contain a filtering medium placed inside the stormwater system's catch basins. The insert can contain one or more treatment mechanisms, which include filtration, sedimentation, or gravitational absorption of oils. The water flows into the inlet, through the filter, where poUutants and contaminants are removed, and then into the drainage system. There are two primary designs for inlet inserts. One design uses fabric filter bags that are suspended in place by the grate or by retainer rods placed across the catch basin. The fabric filter design includes a skirt that dkects the storm water flow to a pouch that may be equipped with wqtr-pa6jdoc - 12- oil-absorbing pillows. These inlet inserts are typically equipped with "Bypass Ports" to prevent flooding during large storm events. Maintenance on the fabric filter inserts includes periodic inspection and replacement of the entke insert when it becomes clogged with captured poUutants. The other design for inlet inserts uses stainless steel, High-Density Polyethylene (HDPE), or other durable materials to form a basket or cage-like insert placed inside the catch basin. This basket contains the filter medium and absorbent materials that treat the storm water as it passes through. These inlet inserts are also equipped with bypass pathways to allow normal operation of the storm drain system during large storm events. Maintenance on the basket-type inlet inserts includes periodic inspection and removal and replacement of the filter medium and absorbent materials (not the entke inlet insert). There are several types of proprietary inlet inserts for both design types: • Fabric Filter Bag Design o Stream Guard: Stream Guard works by initially capturing sediment and trash and debris, and then combats dissolved oil, nutrients and metals through a filter media. o Ultra-Drainguard: Ultra-Drainguard works by initially capturing sediment and trash and debris, and then combats dissolved oil, nutrients and metals through a filter media. The Ultra-Drainguard has an oil absorbent pillow that can be replaced separate from the filter during times of large free-oil runoff • Basket-type Inlet Inserts o AbTech Ultra-Urban Filter: The Ultra-Urban Filter is a cost-effective BMP designed for use in storm drains that experience oil and grease pollution accompanied by sediment and trash and debris. The oil is permanently bonded to a SmartSponge, while sediment and trash and debris are captured in an intemal basket. URL: http://www.epa.gov/regionl/assistance/ceitts/stormwater/techs/ wqtr-pa6.doc - 13- o AquaGuard: AquaGuard works by initially capturing sediment and trash and debris, and then combats dissolved oil, nutrients and metals through a filter media. AquaGuard compares to others by being easy to handle, i.e. no special Ufting equipment for filter removal. o FloGard: FloGard uses catch basin filtration, placing catch basin insert devices with a fiker medium just under the grates ofthe stormwater system's catch basins. FloGard handles non-soluble solids such as sediment, gravel, and hydrocarbons, which are all potential pollutants originating from the roof and parking lot. FloGard is available for standard catch basins and for roof downspouts. ^ Recommended Filtration System Option Sand, media, and bioretention filters requke large amounts of land and have extremely high maintenance costs compared to proprietary filtration designs. Of the two types of fdtration based inlet insert designs, experience within Southem California has shown the basket-type inlet inserts to be more reliable and less cumbersome for maintenance and proper operation.^ Therefore, the best type of filtration system for this project is one of the basket-type proprietary filtration based inlet inserts. Hydrodynamic Separator Systems Hydrodynamic separator systems (HDS) are flow-through structures with a settUng or separation unit to remove sediments and other pollutants that are widely used in storm water treatment. No outside power source is requked, because the energy of the flowing water allows the sediments to efficiently separate. Depending on the type of unit, this separation may be by means of swirl action or indkect filtration. •* 2003 KriStar Enterprises, Inc. ' Correspondence with the City of Dana Point, the City of Encinitas, and the City of Santa Monica wqtr-pa6.doc -14- Hydrodynamic separator systems are most effective where the materials to be removed from mnoff are heavy particulates that can be settled or floatables that can be captured, rather than soUds with poor settleability or dissolved pollutants. For hydrodynamic separator systems, there are four major proprietary types: • Continuous Deflective Separation (CDS): CDS provides the lowest cost overall when compared to other HDS units. A sorbent material can be added to remove unattached oil and grease.^ • Downstream Defender™: Downstream Defender traps sediment while intercepting oil and grease with a small head loss. • Stormceptor®: Stormceptor traps sediment while intercepting oil and grease.^ • Vortechs^'^: Vortechs combines baffle walls, ckcular grit chambers, flow control chambers, and an oil chamber to remove settleable soUds and floatables from the storm water runoff^ Recommended Hydrodynamic Separator System Option All of the abovementioned devices sufficiently remove the pollutants of concern from this site. The best hydrodynamic separator for this project is the CDS unit because of its relatively low cost and because it has been widely used in San Diego County. BMP Selection Basket-type proprietary filtration-based inlet inserts and CDS units are feasible options for this project. The recommended treatment BMP is a CDS Unit. The CDS Unit will be able to treat multiple planning areas in the Bressi Ranch Development, including Planning Area 6. The CDS CDS Technologies Inc 2002 2003 Hydro Intemational " Stormceptor 2003 ' http://www.epa.gov/owm/mtb/hydro.pdf wqtr-pa6.doc 15 - Unit will have lower maintenance frequency and costs than the inlet inserts due to the large number of inlets in the planning areas. BMP Plan Assumptions The following assumptions were made in calculating the requked BMP sizes: • Flows generated onsite will be treated, as well as storm water flows from Planning Areas 3b, 4, 10 and 15a. • A runoff coefficient, 'C value, of 0.80 was used in the mnoff calculations for the tributary treatment area. The treatment area includes industrial and residential areas, therefore the 'C value reflects the proportions of each for the BMP design. Table 5 summarizes the criteria that should be implemented in the design of the recommended project BMP. TABLE 5. BMP DESIGN CRITERL^ BMI'lUdiologv Treat nifiil Area/Voluiiu-Design Constraints Flow-based: Q=CIA I = 0.2 in/hour C= runoff coefficient A = acreage Qtreatment= 23.7 CFS I = 0.2 in/hour C= 0.80 A = 148.0 acres • Locate outside public right-of-way • Facilitate access for maintenance • Avoid utility conflicts • Treatment Area/Volume includes Bressi Ranch Planning Areas 3b, 4, 6, 10, and 15a. wqtr-pa6.doc 16- 5. PROJECT BMP PLAN IMPLEMENTATION This section identifies the recommended BMP options that meet the applicable storm water and water quality ordinance requirements. This includes incorporating BMPs to minimize and mitigate for runoff contamination and volume from the site. The plan was developed per the proposed roadway and lot layout/density associated with the site. Construction BMPs During construction, BMPs such as desilting basins, silt fences, sand bags, gravel bags, fiber roUs, and other erosion control measures may be employed consistent with the NPDES Storm Water Pollution Prevention Plan (SWPPP). The objectives of the SWPPP are to: • Identify all pollutant sources, including sources of sediment that may affect the water quaHty of storm water discharges associated with construction activity from the construction site; • Identify non-storm water discharges; • Identify, construct, implement in accordance with a time schedule, and maintain BMPs to reduce or eliminate pollutants in storm water discharges and authorized non-storm water discharges from the construction site during constmction; and • Develop a maintenance schedule for BMPs installed during construction designed to reduce or eliminate pollutants after construction is completed (post-construction BMPs). Recommended Post-Construction BMP Plan PDC has identified a recommended water quality BMP plan for the Bressi Ranch Residential Planning Area 6 Project. The following BMP plan is preUminary and is subject to change pending City review and implementation of future policy requkements, and final engineering design. wqtr-pa6xJoc 17- The recommended post-construction BMP plan includes site design, source control, and treatment BMPs. The site design and source control BMPs include protection of slopes and channels, inlet stenciling and signage, covered trash storage, efficient irrigation, storm water education, and integrated pest management principles. The treatment BMP selected for this project is a CDS Unit. TABLE 6. POST-CONSTRUCTION BMP SUMMARY Pollutant Pollutant Sources Mitigation Measures Sediment and attached pollutants (nutrients, pesticides, heavy metals) Landscaping, driveways, rooftops Inlet stenciling and signage, education of residents, CDS Unit Trash and debris Littering, trash storage areas, swimming pool deck, rooftop Inlet stenciling and signage, covered trash storage, education of residents, CDS Unit Bacteria and vimses Trash storage areas, pets Covered trash storage, education of residents Oxygen demanding substances Landscaping, driveways and roadways Inlet stenciling and signage, regular City of San Diego yard waste pickup, education of residents, detention basin, CDS Unit Oil and grease Driveways, roadways Inlet StenciUng and signage, education of residents, CDS Unit Operation and Maintenance Plans The City Storm Water Standards requke a description of the long-term maintenance requkements of proposed BMPs and a description of the mechanism that will ensure ongoing long-term maintenance. Operation and maintenance plans for the recommended post- construction BMP for this project are located in Appendix 4. The Project BMP costs and the maintenance funding sources are provided in the following section. wqtr-pa6.doc 18 6. PROJECT BMP COSTS AND FUNDING SOURCES Table 7 below provides the anticipated capital and annual maintenance costs for the CDS Unit. TABLE 7. BMP COSTS liMPOPJION Equipmeni ( osl Inst.ill.ilidn ( list \ 11 nual Maintenance 1. Single CDS Unit Model PMSU 70_70 $64,900* $55,900 $1,000 *CDS Units are a proprietary BMP and may vary in cost at the manufacturer's discretion. The developer will incur the capital cost for the BMP installation. The responsible party for long-term maintenance and funding is the Home Owners' Association (HOA) for Bressi Ranch. wqtr-pa6.doc - 19 APPENDIX 1 Storm Water Requirements Applicability Checklist City of Carlsbad Storm Water Requirements Applicability Checklist Project Address: Bressi Ranch Planning Area 6 Assessor Parcel Number(s): Project Number (for City Use Only) Complete Sections 1 and 2 of the following checklist to determine your project's pemnanent and construction storm water best management practices requirements. This form must be completed and submitted with your pemiit 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, "Pemianent 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 only to the Standard Permanent Storm Water BMP Requirements. If every question in Part A and B is answered "No," your project is exempt from permanent storm water requirements. Part A: Determine Priority Project Permanent Storm Water BMP Requirements. Does the project meet the definition of one or more of the priority project categories?* 1. "Detached residential development of 10 or more units" ^Yes No 2. "Attached residential development of 10 or more unils" Yes '^No 3. "Commercial development greater than 100,000 square feet" Yes ^No 4. "Automotive repair shop" Yes >^No 5. "Restaurant" Yes ^No 6. "Steep hillside development greater than 5,000 square feet" Yes ^No 7. "Project discharging to receiving waters within Water Quality Sensitive Areas" Yes ^No 8. "Parking lol" greater than or equal to 5,000 ff or with al least 15 parking spaces, and potentially Yes •No exposed to urban runoff Yes •No 9. "Streets, roads, highways, and freeways" that would create a new paved surface that is 5,000 square '^Yes No feet or greater '^Yes No 10. "Significant redevelopment" over 5,000 ft Yes * Refer to the definitions section in the Storm Water Standards for expanded definitions of the priority project categories. Umited Exclusion: Trenching and resurfacing work associated with utility projects are not considered priority projects. Parking lots, buildings and other structures associated with utility projects are priority projects if one or more of the criteria in Part A is met. If all answers to Part A are "No", continue to Part B. Part B: Determine Standard Permanent Storm Water Requirements. Does the project propose: 1. New impervious areas, such as rooftops, roads, parking lots, driveways, paths and sidewalks? ^es No 2. New pervious landscape areas and irrigation systems? v'Yes No 3. Permanent structures within 100 feet of any natural water body? Yes •No 4. Trash slorage areas? •^Yes No 5. Liquid or solid material loading and unloading areas? Yes •No 6. Vehicle or equipment fueling, washing, or maintenance areas? Yes •No 7. Require a General NPDES Permit for Storm Water Discharges Associated with Industrial Activities Yes •No (Except construction)?* Yes •No 8. Commercial or industrial waste handling or storage, excluding typical office or household waste? Yes •No 9. Any grading or ground disturbance during construction? •Yes No 10. Any new storm drains, or alteration to existing storni drains? •Yes No *To find out if your project is required to obtain an individual General NPDES Permit for Storm Water Discharges Associated with Industrial Activities, visit the State Water Resources Control Board web site at, www.swrcb.ca.gov/stormwtr/industrial.html. Section 2. Construction Storm Water BMP Requirements: If the answer to question 1 of Part C is answered "Yes," your project is subject to Section IV, "Construction Stomn Water BMP Perfonnance 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 Stonn Water BMP Perfonnance Standards," and must prepare a Water Pollution Control Plan (WPCP). If every question in Part C is answered "No," your project is exempt trom any construction stomn water BMP requirements. If any of the answers to the questions in Part C are "Yes," complete the construction site prioritization in Part D, below. Part C: Determine Construction Phase Storm Water Requirements. Would the project meet any of these criteria during construction? 1. Is the project subject to California's statewide General NPDES Permit for Storm Water Discharges Associated With Construction Activities? 2. Does the project propose grading or soil disturbance? •Yes No 3. Would storm water or urban runoff have the potential to contact any portion of the construction area, including washing and staging areas? Would the project use any construction materials that could negatively affect waler quality if discharged from the site (such as, paints, solvents, concrete, and stucco)? •Yes No Part D: Determine Construction Site Priority In accordance with the Municipal Permit, each construction site with construction storm water BMP requirements must be designated with a priority: high, medium or low. This prioritization must be completed with this form, noted on the plans, and included in the SWPPP or WPCP. Indicate the project's priority in one of the check boxes using the criteria below, and existing and surrounding conditions of the project, the lype of activities necessary lo complete the construction and any other extenuating circumstances that may pose a threat to water quality. The City reserves the right to adjust the priority of the projects both before and during construction. [Note: The constmction priority does NOT change construction BMP requirements that apply to projects; all construction BMP requirements must be identified on a case-by-case basis. The construction priority does affect the frequency of inspections that will be conducted by City staff. See Section IV. 1 for more details on construction BMP requirements.) ^ A) High Priority 1) Projects where the site is 50 acres or more and grading will occur during the wet season 2) Projects 5 acres or more and tributary to an impaired water body for sediment by the most current Clean Water Act Section 303(d) list (e.g., Penasquitos watershed) 3) Projects 5 acres or more within or directly adjacent to or discharging directly to a coastal lagoon or other receiving water within an water quality sensitive area 4) Projects, active or inactive, adjacent or tributary to sensitive water bodies • B) Medium Priority 1) Capital Improvement Projects where grading occurs, however a Storm Water Pollution Prevention Plan (SWPPP) is not required under the State General Construction Pennit (i.e., water and sewer replacement projects, intersection and street re-alignments, widening, comfort stations, etc.) 2) Pemnit projects in the public right-of-way where grading occurs, however SWPPPs are not required, such as installation of sidewalk, substantial retaining walls, curiD and gutter for an entire street frontage, etc. 3) Permit projects on private property where grading pennits are required (i.e., cuts over 5 feet, fills over 3 feet), however. Notice Of Intents (NOIs) and SWPPPs are not required. • C) Low Priority 1) Capital Projects where minimal to no grading occurs, such as signal light and loop installations, street light installations, etc. 2) Permit projects in the public right-of-way where minimal to no grading occurs, such as pedestrian ramps, driveway additions, small retaining walls, etc. 3) Permit projects on private property where grading permits are not required, such as small retaining walls, single- family homes, small tenant improvements, etc. APPENDIX 2 Project Maps VICINITY MAP NOT TO SCALE