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Home My WebLink AboutAppendix F_WQMPPreliminary Water Quality Management Plan For: Public Storage 17173 Valley Boulevard, Fontana, CA GRADING PERMIT NO. XXXXXX Prepared for: PUBLIC STORAGE 701 Western Avenue Glendale, CA 91201 (xxxx) xxx-xxxx Prepared by: DRC Engineering, Inc. 160 South Old Springs Road, Suite 210 Anaheim Hills, CA 92808 (714) 685-6860 DRC Project No. 20-581 Submittal Date: 12-22-2022 Revision Date: Preliminary for Entitlements Complete Date: Construction WQMP Complete Date: Final WQMP Approved Date: MCN No. WQMP No. WQMP21-xxxxxx Water Quality Management Plan (WQMP) Owner’s Certification Project Owner’s Certification This Preliminary Water Quality Management Plan (WQMP) has been prepared for Public Storage by DRC Engineering, Inc. The Preliminary WQMP is intended to comply with the requirements of the City of Fontana and the NPDES Areawide Stormwater Program requiring the preparation of a WQMP. The undersigned, while it owns the subject property, is responsible for the implementation of the provisions of this plan and will ensure that this plan is amended as appropriate to reflect up-to-date conditions on the site consistent with San Bernardino County’s Municipal Storm Water Management Program and the intent of the NPDES Permit for San Bernardino County and the incorporated cities of San Bernardino County within the Santa Ana Region. Once the undersigned transfers its interest in the property, its successors in interest and the city/county shall be notified of the transfer. The new owner will be informed of its responsibility under this WQMP. A copy of the approved WQMP shall be available on the subject site in perpetuity. “I certify under a penalty of law that the provisions (implementation, operation, maintenance, and funding) of the WQMP have been accepted and that the plan will be transferred to future successors.” . Project Data Permit/Application Number(s): WQMP21-xxxxxx Grading Permit Number(s): TBD Tract/Parcel Map Number(s): Building Permit Number(s): TBD CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract): APN: 0194-351-12, 16, 22 Owner’s Signature Owner Name: Title Company Public Storage Address 701 Western Avenue, Glendale, CA Email Telephone # Signature Date Water Quality Management Plan (WQMP) Contents Preparer’s Certification Project Data Permit/Application Number(s): Grading Permit Number(s): TBD Tract/Parcel Map Number(s): Building Permit Number(s): TBD CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract): APN: 0194-351-12, 16, 22 “The selection, sizing and design of stormwater treatment and other stormwater quality and quantity control measures in this plan were prepared under my oversight and meet the requirements of Regional Water Quality Control Board Order No. R8-2010-0036.” Engineer: Christopher McKee PE Stamp Below Title Project Manager Company DRC Engineering, Inc. Address 160 S. Old Springs Rd. #210 Anaheim Hills, CA 92808 Email cmckee@drc-eng.com Telephone # (714) 685-6860 x356 Signature Date Water Quality Management Plan (WQMP) Contents ii Table of Contents Section 1 Discretionary Permits ......................................................................................... 1-1 Section 2 Project Description ............................................................................................... 2-1 2.1 Project Information ........................................................................................ 2-1 2.2 Property Ownership / Management .............................................................. 2-2 2.3 Potential Stormwater Pollutants ................................................................... 2-3 2.4 Water Quality Credits ........ ……………………………………………………………………………. 2-4 Section 3 Site and Watershed Description ......................................................................... 3-1 Section 4 Best Management Practices ................................................................................ 4-1 4.1 Source Control BMP ....................................................................................... 4-1 4.1.1 Pollution Prevention ................................................................................... 4-1 4.1.2 Preventative LID Site Design Practices ....................................................... 4-6 4.2 Project Performance Criteria......................................................................... 4-7 4.3 Project Conformance Analysis ....................................................................... 4-12 4.3.1 Site Design Hydrologic Source Control BMP .............................................. 4-14 4.3.2 Infiltration BMP .......................................................................................... 4-16 4.3.3 Harvest and Use BMP .................................................................................. 4-18 4.3.4 Biotreatment BMP....................................................................................... 4.19 4.3.5 Conformance Summary ............................................................................... 4-23 4.3.6 Hydromodification Control BMP ............................................................... 4-24 4.4 Alternative Compliance Plan (if applicable) ................................................. 4-25 Section 5 Inspection & Maintenance Responsibility Post Construction BMPs ................. 5-1 Section 6 Site Plan and Drainage Plan ................................................................................ 6-1 6.1. Site Plan and Drainage Plan.......................................................................... 6-2 6.2 Electronic Data Submittal ............................................................................. 6-3 6.3 Post Construction .......................................................................................... 6-4 6.4 Other Supporting Documentation ................................................................ 6-5 Forms Form 1-1 Project Information ............................................................................................... 1-1 Form 2.1-1 Description of Proposed Project ......................................................................... 2-1 Form 2.2-1 Property Ownership/Management ..................................................................... 2-2 Form 2.3-1 Pollutants of Concern ......................................................................................... 2-3 Form 2.4-1 Water Quality Credits ......................................................................................... 2-4 Form 3-1 Site Location and Hydrologic Features ................................................................. 3-1 Form 3-2 Hydrologic Characteristics .................................................................................... 3-2 Form 3-3 Watershed Description .......................................................................................... 3-3 Form 4.1-1 Non-Structural Source Control BMP ................................................................... 4-2 Form 4.1-2 Structural Source Control BMP .......................................................................... 4-4 Form 4.1-3 Site Design Practices Checklist ........................................................................... 4-6 Form 4.2-1 LID BMP Performance Criteria for Design Capture Volume ............................. 4-7 Water Quality Management Plan (WQMP) Contents iii Form 4.2-2 Summary of HCOC Assessment .......................................................................... 4-8 Form 4.2-3 HCOC Assessment for Runoff Volume ............................................................... 4-9 Form 4.2-4 HCOC Assessment for Time of Concentration .................................................. 4-10 Form 4.2-5 HCOC Assessment for Peak Runoff .................................................................... 4-11 Form 4.3-1 Infiltration BMP Feasibility ................................................................................ 4-13 Form 4.3-2 Site Design Hydrologic Source Control BMP ..................................................... 4-14 Form 4.3-3 Infiltration LID BMP ........................................................................................... 4-17 Form 4.3-4 Harvest and Use BMP ......................................................................................... 4-18 Form 4.3-5 Selection and Evaluation of Biotreatment BMP ................................................ 4-19 Form 4.3-6 Volume Based Biotreatment – Bioretention and Planter Boxes w/Underdrains 4-20 Form 4.3-7 Volume Based Biotreatment- Constructed Wetlands and Extended Detention 4-21 Form 4.3-8 Flow Based Biotreatment ................................................................................... 4-22 Form 4.3-9 Conformance Summary and Alternative Compliance Volume Estimate .......... 4-23 Form 4.3-10 Hydromodification Control BMP ..................................................................... 4-24 Form 5-1 BMP Inspection and Maintenance ........................................................................ 5-1 Appendix A - Vicinity Map, Figures and Exhibits Appendix B - BMP Calculations and Manufacturer Cutsheets Appendix C - Education Materials Appendix D - BMP Fact Sheets Water Quality Management Plan (WQMP) 1-1 Section 1 Discretionary Permit(s) Form 1-1 Project Information Project Name Public Storage Fontana Project Owner Contact Name: Mailing Address: 701 Western Ave. Glendale, CA 91201 E-mail Address: Telephone: (949) 705-0426 Permit/Application Number(s): WQMP21-xxxxxx Tract/Parcel Map Number(s): Additional Information/ Comments: Description of Project: The project site boundary is 2.11 acres inside of an existing 5.33-acre Public Storage property lot. The existing site consists of buildings, parking and an undeveloped outlot. The entire site drains southerly towards a concrete channel (Mulberry Channel) just north of the San Bernardino (10) Freeway. The site is within Hydrologic Soil Group A per Fig. 2-1 of Appendix A. The proposed site will have a 3-story storage building, with approximately 36,500 square feet of surface area (109,566 SF building area), and parking. There will be approximately 9,300 square feet of landscape around the site. The proposed development will be consistent with the existing condition in terms of the overall drainage pattern. There will be three drainage areas, DA 1, DA 2, DA 3, and DA 4. DA 1 is intended to be truck parking and will be 100% impervious. Surface runoff will be directed southerly towards the building and will be intercepted by drainage inlet(s). The drainage inlet(s) will be connected to an underground storm drain system. Underground storm drain pipes will convey drainage to an underground infiltration basin prior to discharging to the existing 18” storm drain, which in turn will discharge southerly outside the property to a concrete channel. DA 2 consists of the proposed building and customer parking. The proposed drainage area is 91% impervious and surface runoff will be directed southerly to a proposed drainage inlet. Similar to DA 1, DA 2 will be connected to an underground storm drain system. Underground storm drain pipes will convey drainage to an underground infiltration basin prior to discharging to the existing 18” storm drain (confluencing with DA 1 discharge), which in turn will discharge southerly outside the property to a concrete channel. DA 3 consists of an existing building that is being removed as part of this development. The existing 100% impervious surface is being replaced by pavement and landscape and will be approximately 67% impervious after development. DA 4 is located at the northern-most part of the property at the entrance on Valley Blvd. The existing office building at the front will be fully removed as well as portions of two storage buildings. A smaller office building is proposed as well as a transformer pad, trash enclosure, and additional parking. The proposed drainage area will be 94% impervious. Water Quality Management Plan (WQMP) 1-2 The proposed underground infiltration basins (Stormech MC-3500) will be the LID BMPs fro DA 1, DA 2, and DA 4. Storm filters inside the drainage inlets will act as pre-treatment. DA 3’s infiltration system will be an above-ground basin. Refer to the WQMP Exhibit in Appendix A. Provide summary of Conceptual WQMP conditions (if previously submitted and approved). Attach complete copy. Water Quality Management Plan (WQMP) 2-1 Section 2 Project Description 2.1 Project Information This section of the WQMP should provide the information listed below. The information provided for Conceptual/ Preliminary WQMP should give sufficient detail to identify the major proposed site design and LID BMPs and other anticipated water quality features that impact site planning. Final Project WQMP must specifically identify all BMP incorporated into the final site design and provide other detailed information as described herein. The purpose of this information is to help determine the applicable development category, pollutants of concern, watershed description, and long-term maintenance responsibilities for the project, and any applicable water quality credits. This information will be used in conjunction with the information in Section 3, Site Description, to establish the performance criteria and to select the LID BMP or other BMP for the project or other alternative programs that the project will participate in, which are described in Section 4. Form 2.1-1 Description of Proposed Project 1 Development Category (Select all that apply): Significant re-development involving the addition or replacement of 5,000 ft2 or more of impervious surface on an already developed site New development involving the creation of 10,000 ft2 or more of impervious surface collectively over entire site Automotive repair shops with standard industrial classification (SIC) codes 5013, 5014, 5541, 7532- 7534, 7536-7539 Restaurants (with SIC code 5812) where the land area of development is 5,000 ft2 or more Hillside developments of 5,000 ft2 or more which are located on areas with known erosive soil conditions or where the natural slope is 25 percent or more Developments of 2,500 ft2 of impervious surface or more adjacent to (within 200 ft) or discharging directly into environmentally sensitive areas or waterbodies listed on the CWA Section 303(d) list of impaired waters. Parking lots of 5,000 ft2 or more exposed to storm water Retail gasoline outlets that are either 5,000 ft2 or more, or have a projected average daily traffic of 100 or more vehicles per day Non-Priority / Non-Category Project May require source control LID BMPs and other LIP requirements. Please consult with local jurisdiction on specific requirements. 2 Project Area (ft2): 91,936 3 Number of Dwelling Units: 0 4 SIC Code: 4225 5 Is Project going to be phased? Yes No If yes, ensure that the WQMP evaluates each phase as a distinct DA, requiring LID BMPs to address runoff at time of completion. 6 Does Project include roads? Yes No If yes, ensure that applicable requirements for transportation projects are addressed (see Appendix A of TGD for WQMP) Water Quality Management Plan (WQMP) 2-2 2.2 Property Ownership/Management Describe the ownership/management of all portions of the project and site. State whether any infrastructure will transfer to public agencies (City, County, Caltrans, etc.) after project completion. State if a homeowners or property owners association will be formed and be responsible for the long-term maintenance of project stormwater facilities. Describe any lot-level stormwater features that will be the responsibility of individual property owners. Form 2.2-1 Property Ownership/Management Describe property ownership/management responsible for long-term maintenance of WQMP stormwater facilities: The site is being developed by the owner, Public Storage. Stormwater facilities and source control measures on the proposed development will be operated and maintained by the owner. Refer to section 5.0 of this WQMP for entities that will be responsible for implementing this WQMP. Water Quality Management Plan (WQMP) 2-3 2.3 Potential Stormwater Pollutants Determine and describe expected stormwater pollutants of concern based on land uses and site activities (refer to Table 3-3 in the TGD for WQMP). Form 2.3-1 Pollutants of Concern Pollutant Please check: E=Expected, N=Not Expected Additional Information and Comments Pathogens (Bacterial / Virus) E N Bacteria and viruses are ubiquitous microorganisms that thrive under certain environmental conditions. Their proliferation is typically caused by the transport of animal or human fecal wastes from the watershed. Water, containing excessive bacteria and viruses, can alter the aquatic habitat and create a harmful environment for humans and aquatic life. Also, the decomposition of excess organic waste causes increased growth of undesirable organisms in the water. Nutrients - Phosphorous E N Nutrients are inorganic substances. Excessive discharge of nutrients to water bodies and streams causes entrophication, where aquatic plants and algae growth can lead to excessive decay of organic matter in the water body, loss of oxygen in the water, release of toxins in sediment, and the eventual depth of aquatic organisms. Primary sources of nutrients in urban runoff are fertilizers and eroded soils. Nutrients - Nitrogen E N (See Nutrients - Phosphorous) Noxious Aquatic Plants E N Not Applicable Sediment E N Sediments are solid materials that are eroded from the land surface. Sediments can increase turbidity, clog fish gills, reduce spawning habitat, lower survival rates of young aquatic organisms, smother bottom dwelling organisms, and suppress aquatic vegetation growth. Metals E N The primary source of metal pollution in stormwater is typically commercially available metals and metal products, as well as emissions from brake pad and tire tread wear associated with driving. Oil and Grease E N Oil and grease in water bodies decreases the aesthetic value of the water body, as well as the water quality. Primary sources of oil and grease are petroleum hydrocarbon products, motor products from leaking vehicles, esters, oils, fats, waxes, and high molecular-weight fatty acids. Trash/Debris E N Trash (such as paper, plastic, polystyrene packing foam, and aluminum materials) and biodegradable organic matter (such as leaves, grass cuttings, and food waste) are general waste products on the landscape. The presence of trash and debris may have a significant impact on the recreational value of a Water Quality Management Plan (WQMP) 2-4 water body and aquatic habitat. Trash also impacts water quality by increasing biochemical oxygen demand. Pesticides / Herbicides E N Pesticides and herbicides are organic compounds used to destroy, prevent, mitigate insects, rodents, fungi, weeds, and other undesirable pests. Pesticides and herbicides can be washed off urban landscapes and buildings during storm events. Organic Compounds E N Organic compounds are carbon-based. Commercially available or naturally occurring organic compounds are found in solvents and hydrocarbons. Organic compounds can, at certain concentrations, indirectly or directly constitute a hazard to life or health. When rinsing off objects, toxic levels of solvents and cleaning compounds can be discharged to storm drains. Dirt, grease, and grime retained in the cleaning fluid or rinse water may also absorb levels of organic compounds that are harmful or hazardous to aquatic life. Sources of organic compounds may include waste handling areas and vehicle or landscape maintenance areas. Other: E N Other: E N Other: E N Other: E N Other: E N Water Quality Management Plan (WQMP) 2-5 2.4 Water Quality Credits A water quality credit program is applicable for certain types of development projects if it is not feasible to meet the requirements for on-site LID. Proponents for eligible projects, as described below, can apply for water quality credits that would reduce project obligations for selecting and sizing other treatment BMP or participating in other alternative compliance programs. Refer to Section 6.2 in the TGD for WQMP to determine if water quality credits are applicable for the project. Form 2.4-1 Water Quality Credits 1 Project Types that Qualify for Water Quality Credits: Select all that apply Redevelopment projects that reduce the overall impervious footprint of the project site. [Credit = % impervious reduced] Higher density development projects Vertical density [20%] 7 units/ acre [5%] Mixed use development, (combination of residential, commercial, industrial, office, institutional, or other land uses which incorporate design principles that demonstrate environmental benefits not realized through single use projects) [20%] Brownfield redevelopment (redevelop real property complicated by presence or potential of hazardous contaminants) [25%] Redevelopment projects in established historic district, historic preservation area, or similar significant core city center areas [10%] Transit-oriented developments (mixed use residential or commercial area designed to maximize access to public transportation) [20%] In-fill projects (conversion of empty lots & other underused spaces < 5 acres, substantially surrounded by urban land uses, into more beneficially used spaces, such as residential or commercial areas) [10%] Live-Work developments (variety of developments designed to support residential and vocational needs) [20%] 2 Total Credit % 0 (Total all credit percentages up to a maximum allowable credit of 50 percent) Description of Water Quality Credit Eligibility (if applicable) Water Quality Management Plan (WQMP) 3-1 Section 3 Site and Watershed Description Describe the project site conditions that will facilitate the selection of BMP through an analysis of the physical conditions and limitations of the site and its receiving waters. Identify distinct drainage areas (DA) that collect flow from a portion of the site and describe how runoff from each DA (and sub-watershed DMAs) is conveyed to the site outlet(s). Refer to Section 3.2 in the TGD for WQMP. The form below is provided as an example. Then complete Forms 3.2 and 3.3 for each DA on the project site. If the project has more than one drainage area for stormwater management, then complete additional versions of these forms for each DA / outlet. Form 3-1 Site Location and Hydrologic Features Site coordinates take GPS measurement at approximate center of site Latitude 34°04"05.63"N Longitude 117°25'50.06"W Thomas Bros Map page 605 1 San Bernardino County climatic region: Valley Mountain 2 Does the site have more than one drainage area (DA): Yes No If no, proceed to Form 3-2. If yes, then use this form to show a conceptual schematic describing DMAs and hydrologic feature connecting DMAs to the site outlet(s). An example is provided below that can be modified for proposed project or a drawing clearly showing DMA and flow routing may be attached Conveyance Briefly describe on-site drainage features to convey runoff that is not retained within a DMA DA1 DMA A to Outlet Underground infiltration chambers overflow to proposed underground pipe to existing 18” storm drain pipe that leads to the existing concrete channel. DA2 DMA B to Outlet Underground infiltration chambers overflow to proposed underground pipe to existing 18” storm drain pipe that leads to the existing concrete channel. DA3 DMA C to Outlet Above-ground infiltration basin overflow to proposed underground pipe to existing 18” storm drain pipe that leads to the existing concrete channel. DA4 DMA D to Outlet Underground infiltration chambers overflow or “bubble up” out of the proposed catch basins, and will surface drain to the existing concrete channel. DA1 DMA A Outlet DA2 DMA B DA4 DMA D DA3 DMA C Water Quality Management Plan (WQMP) 3-2 Form 3-2a Existing Hydrologic Characteristics for Existing Drainage Area (Overall Project Site) For Drainage Area 1’s sub-watershed DMA, provide the following characteristics 1 DMA drainage area (ft2) 91,936 2 Existing site impervious area (ft2) 65,496 3 Antecedent moisture condition For desert areas, use http://www.sbcounty.gov/dpw/floodcontrol/pdf/2 0100412_map.pdf I 4 Hydrologic soil group Refer to Watershed Mapping Tool – http://permitrack.sbcounty.gov/wap/ A 5 Longest flowpath length (ft) 445 6 Longest flowpath slope (ft/ft) 0.012 7 Current land cover type(s) Select from Fig C-3 of Hydrology Manual Commercial, Downtown Business or Industrial 8 Pre-developed pervious area condition: Based on the extent of wet season vegetated cover good >75%; Fair 50-75%; Poor <50% Attach photos of site to support rating Poor Water Quality Management Plan (WQMP) 3-3 Form 3-3 Watershed Description for Drainage Area Receiving waters Refer to Watershed Mapping Tool - http://permitrack.sbcounty.gov/wap/ See ‘Drainage Facilities” link at this website · Mulberry Channel · Declez Channel · Etiwanda/San Sevaine Channel · Santa Ana River Reach 3 Applicable TMDLs Refer to Local Implementation Plan · Nitrate and Phosphates 303(d) listed impairments Refer to Local Implementation Plan and Watershed Mapping Tool – http://permitrack.sbcounty.gov/wap/ and State Water Resources Control Board website – http://www.waterboards.ca.gov/santaana/water_iss ues/programs/tmdl/index.shtml · Etiwanda/San Sevaine Channel: None · Santa Ana River Reach 3: Copper, Lead, and Pathogens Environmentally Sensitive Areas (ESA) Refer to Watershed Mapping Tool – http://permitrack.sbcounty.gov/wap/ · N/A Unlined Downstream Water Bodies Refer to Watershed Mapping Tool – http://permitrack.sbcounty.gov/wap/ · Mulberry Channel · Declez Channel · Santa Ana River, Reach 3 Hydrologic Conditions of Concern Yes Complete Hydrologic Conditions of Concern (HCOC) Assessment. Include Forms 4.2-2 through Form 4.2-5 and Hydromodification BMP Form 4.3-10 in submittal No; See Figure 2-2 of Appendix A for HCOC Exempt Map Watershed–based BMP included in a RWQCB approved WAP Yes Attach verification of regional BMP evaluation criteria in WAP • More Effective than On-site LID • Remaining Capacity for Project DCV • Upstream of any Water of the US • Operational at Project Completion • Long-Term Maintenance Plan No See Appendix B for WAP approval. Water Quality Management Plan (WQMP) 4-1 Section 4 Best Management Practices (BMP) 4.1 Source Control BMP 4.1.1 Pollution Prevention Non-structural and structural source control BMP are required to be incorporated into all new development and significant redevelopment projects. Form 4.1-1 and 4.1-2 are used to describe specific source control BMPs used in the WQMP or to explain why a certain BMP is not applicable. Table 7-3 of the TGD for WQMP provides a list of applicable source control BMP for projects with specific types of potential pollutant sources or activities. The source control BMP in this table must be implemented for projects with these specific types of potential pollutant sources or activities. The preparers of this WQMP have reviewed the source control BMP requirements for new development and significant redevelopment projects. The preparers have also reviewed the specific BMP required for project as specified in Forms 4.1-1 and 4.1-2. All applicable non-structural and structural source control BMP shall be implemented in the project. Water Quality Management Plan (WQMP) 4-2 Form 4.1-1 Non-Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, if not applicable, state reason Included Not Applicable N1 Education of Property Owners, Tenants and Occupants on Stormwater BMPs The property owner shall provide environmental awareness education materials. The property owner shall provide the educational materials to tenants. N2 Activity Restrictions Conditions, Covenants, and Restriction (CC&Rs) shall be required for the purpose of water quality protection. Pesticide application in common areas must be performed by an applicator certified by the California Department of Pesticide Regulation. N3 Landscape Management BMPs Project plan designs should conserve natural areas to the extent possible, maximize natural water storage and infiltration opportunities, and protect slopes and channels. Plants should be grouped with similar water requirements in order to reduce excess irrigation runoff and promote surface filtration. Landscaping shall correlate to the climate, soil, related natural resources and existing vegetation of the site, as well as the type of development proposed. Ongoing maintenance consistent with County Administrative Design Guidelines (available at http://www.co.san- bernardino.ca.us/landuseservices/Informational%20Handouts/Adminstrative %20Design%20Guidelines-Jan%202002.pdf) or local equivalent, plus fertilizer and pesticide usage consistent with the instructions contained on product labels and with the regulations administered by the State Department of Pesticide Regulation shall be implemented. Hillside areas shall be landscaped with deep-rooted, drought tolerant plant species for erosion control, satisfactory to the local permitting authority. For additional information, see CASQA BMP SD-10, Site Design & Landscape Planning, and SD-12, Efficient Irrigation, included in Appendix D and the Inspection and Maintenance Program table in Section 4.0 for details. Water Quality Management Plan (WQMP) 4-3 Form 4.1-1 Non-Structural Source Control BMPs N4 BMP Maintenance The entity or individual indicated in Section 2.2 of this document shall be responsible for the implementation and maintenance of all structural BMP facilities. N5 Title 22 CCR Compliance (How development will comply) Compliance with Title 22 of California Code of Regulations (CCR) and relevant sections of the California Health & Safety Code regarding the hazardous waste management is enforced by County Environmental Health on behalf of the State. See N9, Hazardous Materials Disclosure Compliance, for how the development will comply with the applicable hazardous waste management section(s) of Title 22. N6 Local Water Quality Ordinances The Permittees, under the Water Quality Ordinance, may issue permits to ensure clean stormwater discharges from areas of concern to public properties. N7 Spill Contingency Plan Tenants should follow City of Bartow’s requirement on hazardous waste handling. See BMP SC-11, Spill Prevention, Control, and Cleanup. N8 Underground Storage Tank Compliance Not present on this site. N9 Hazardous Materials Disclosure Compliance The City of Fontana and San Bernardino County Fire Hazmat enforce and coordinate the management of hazardous materials Water Quality Management Plan (WQMP) 4-4 Form 4.1-1 Non-Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, if not applicable, state reason Included Not Applicable N10 Uniform Fire Code Implementation Compliance with Article 80 of the Uniform Fire Code to be enforced by Chino Valley Independent Fire District. N11 Litter/Debris Control Program Tenants shall be responsible for contracting a company to provide sweeping the private street and parking lot at least twice annually, prior to the storm season in the late summer or early fall, to reduce the amount of sediment, garden waste, and trash, entering the storm drain systems. For additional information, see CASQA BMP SC-34, Waste Handling and Disposal, and SC-43, Parking/Storage Area Maintenance, included in Appendix D and the Inspection and Maintenance Program table in Section 4.0. N12 Employee Training Owners shall require operators to provide appropriate employee training in BMPs and shall also train their staff and contractors. N13 Housekeeping of Loading Docks There are no loading docks N14 Catch Basin Inspection Program Drainage facilities (inlets and basins) must be inspected annually, in the late summer or early fall, and cleaned as needed, or if accumulated sediment/debris fills 25% or more of the sediment/debris storage capacity of the facility. The property owner shall contract a maintenance company to evaluate all portions of the drainage facilities annually to determine the adequacy of the inspection and maintenance frequency, and report the evaluation findings to the City of Fontana. See CASQA BMP SC-44, Drainage System Maintenance in Attachment F and the Inspection and Maintenance Program table in Section 4.0. N15 Vacuum Sweeping of Private Streets and Parking Lots The management team shall be responsible for contracting a company to provide sweeping the private street and parking lot at least twice annually, prior to the storm season in the late summer or early fall, to reduce the amount of sediment, garden waste, and trash entering the storm drain systems. For Water Quality Management Plan (WQMP) 4-5 additional information, see CASQA BMP SC-34, Waste Handling and Disposal, and SC-43, Parking/Storage Area Maintenance, included in Appendix D and the Inspection and Maintenance Program table in Section 4.0. N16 Other Non-structural Measures for Public Agency Projects There are no other non-structural measures. N17 Comply with all other applicable NPDES permits The developer (owner) shall comply with all requirements of the California General Construction Stormwater Permit during the entire period of construction of this project. Water Quality Management Plan (WQMP) 4-6 Form 4.1-2 Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, If not applicable, state reason Included Not Applicable S1 Provide storm drain system stencilling and signage (CASQA New Development BMP Handbook SD-13) Site owners to provide storm drain stenciling and signage per CASQA BMP SD-13 S2 Design and construct outdoor material storage areas to reduce pollution introduction (CASQA New Development BMP Handbook SD-34) Not anticipated S3 Design and construct trash and waste storage areas to reduce pollution introduction (CASQA New Development BMP Handbook SD-32) Trash enclosures to be designed/constructed per CASQA BMP SD-32 with a solid canopy-style roof. S4 Use efficient irrigation systems & landscape design, water conservation, smart controllers, and source control (State-wide Model Landscape Ordinance; CASQA New Development BMP Handbook SD-12) Irrigation practices to comply with CASQA BMP SD-12 S5 Finish grade of landscaped areas at a minimum of 1-2 inches below top of curb, sidewalk, or pavement Landscaped areas to be designed and maintained to be 1-2 inches below impervious surfaces S6 Protect slopes and channels and provide energy dissipation (CASQA New Development BMP Handbook SD-10) Not anticipated S7 Covered dock areas (CASQA New Development BMP Handbook SD-31) Not anticipated S8 Covered maintenance bays with spill containment plans (CASQA New Development BMP Handbook SD-31) Not anticipated S9 Vehicle wash areas with spill containment plans (CASQA New Development BMP Handbook SD-33) Not anticipated S10 Covered outdoor processing areas (CASQA New Development BMP Handbook SD-36) Not anticipated Water Quality Management Plan (WQMP) 4-7 Form 4.1-2 Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, If not applicable, state reason Included Not Applicable S11 Equipment wash areas with spill containment plans (CASQA New Development BMP Handbook SD-33) Not anticipated S12 Fueling areas (CASQA New Development BMP Handbook SD-30) Not anticipated S13 Hillside landscaping (CASQA New Development BMP Handbook SD-10) Not anticipated S14 Wash water control for food preparation areas Not anticipated S15 Community car wash racks (CASQA New Development BMP Handbook SD-33) Not anticipated Water Quality Management Plan (WQMP) 4-8 4.1.2 Preventative LID Site Design Practices Site design practices associated with new LID requirements in the MS4 Permit should be considered in the earliest phases of a project. Preventative site design practices can result in smaller DCV for LID BMP and hydromodification control BMP by reducing runoff generation. Describe site design and drainage plan including: Refer to Section 5.2 of the TGD for WQMP for more details. Form 4.1-3 Preventative LID Site Design Practices Checklist Site Design Practices If yes, explain how preventative site design practice is addressed in project site plan. If no, other LID BMPs must be selected to meet targets Minimize impervious areas: Yes No Explanation: Site design implements use of minimum drive aisle width. Landscape areas are maximized to the largest extent practical. Maximize natural infiltration capacity: Yes No Explanation: On-site infiltration is proposed as means of addressing water quality and hydrologic impacts. Landscape islands will also allow for natural infiltration in certain areas. Preserve existing drainage patterns and time of concentration: Yes No Explanation: Drainage patterns is essentially the same as existing condition. Disconnect impervious areas: Yes No Explanation: Roof drains to discharge into landscape areas when possible before entering area drains. Protect existing vegetation and sensitive areas: Yes No Explanation: The site contains minimal vegetation. Re-vegetate disturbed areas: Yes No Explanation: Pervious areas to be landscaped Minimize unnecessary compaction in stormwater retention/infiltration basin/trench areas: Yes No Explanation: On-site retentions/infiltration basin/trench areas are proposed. Utilize vegetated drainage swales in place of underground piping or imperviously lined swales: Yes No Explanation: Site design use unlined drainage swales to area drains when possible. Stake off areas that will be used for landscaping to minimize compaction during construction: Yes No Explanation: Contractor to be informed to stake off landscaping areas and minimize machinery/equipment use over landscape areas during construction phase.  A narrative of site design practices utilized or rationale for not using practices  A narrative of how site plan incorporates preventive site design practices  Include an attached Site Plan layout which shows how preventative site design practices are included in WQMP Water Quality Management Plan (WQMP) 4-9 4.2 Project Performance Criteria The purpose of this section of the Project WQMP is to establish targets for post-development hydrology based on performance criteria specified in the MS4 Permit. These targets include runoff volume for water quality control (referred to as LID design capture volume), and runoff volume, time of concentration, and peak runoff for protection of any downstream waterbody segments with a HCOC. If the project has more than one outlet for stormwater runoff, then complete additional versions of these forms for each DA / outlet. Methods applied in the following forms include:  For LID BMP Design Capture Volume (DCV), the San Bernardino County Stormwater Program requires use of the P6 method (MS4 Permit Section XI.D.6a.ii) – Form 4.2-1  For HCOC pre- and post-development hydrologic calculation, the San Bernardino County Stormwater Program requires the use of the Rational Method (San Bernardino County Hydrology Manual Section D). Forms 4.2-2 through Form 4.2-5 calculate hydrologic variables including runoff volume, time of concentration, and peak runoff from the project site pre- and post-development using the Hydrology Manual Rational Method approach. For projects greater than 640 acres (1.0 mi2), the Rational Method and these forms should not be used. For such projects, the Unit Hydrograph Method (San Bernardino County Hydrology Manual Section E) shall be applied for hydrologic calculations for HCOC performance criteria. Refer to Section 4 in the TGD for WQMP for detailed guidance and instructions. Form 4.2-1a LID BMP Performance Criteria for Design Capture Volume (DMA A) 1 Project area DA 1 (ft2): 12,370 2 Imperviousness after applying preventative site design practices (Imp%): 1.00 3 Runoff Coefficient (Rc): 0.892 Rc = 0.858(Imp%)^3-0.78(Imp%)^2+0.774(Imp%)+0.04 4 Determine 1-hour rainfall depth for a 2-year return period P2yr-1hr (in): 0.541 http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 0.80 P6 = Item 4 *C1, where C1 is a function of site climatic region specified in Form 3-1 Item 1 (Valley = 1.4807; Mountain = 1.909; Desert = 1.2371) 6 Drawdown Rate Use 48 hours as the default condition. Selection and use of the 24 hour drawdown time condition is subject to approval by the local jurisdiction. The necessary BMP footprint is a function of drawdown time. While shorter drawdown times reduce the performance criteria for LID BMP design capture volume, the depth of water that can be stored is also reduced. 24-hrs 48-hrs 7 Compute design capture volume, DCV (ft3): 1,446 DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24-hr = 1.582; 48-hr = 1.963) Compute separate DCV for each outlet from the project site per schematic drawn in Form 3-1 Item 2 Water Quality Management Plan (WQMP) 4-10 Form 4.2-1a LID BMP Performance Criteria for Design Capture Volume (DMA B) 1 Project area DA 2 (ft2): 62,335 2 Imperviousness after applying preventative site design practices (Imp%): 0.911 3 Runoff Coefficient (Rc): 0.831 Rc = 0.858(Imp%)^3-0.78(Imp%)^2+0.774(Imp%)+0.04 4 Determine 1-hour rainfall depth for a 2-year return period P2yr-1hr (in): 0.541 http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 0.80 P6 = Item 4 *C1, where C1 is a function of site climatic region specified in Form 3-1 Item 1 (Valley = 1.4807; Mountain = 1.909; Desert = 1.2371) 6 Drawdown Rate Use 48 hours as the default condition. Selection and use of the 24 hour drawdown time condition is subject to approval by the local jurisdiction. The necessary BMP footprint is a function of drawdown time. While shorter drawdown times reduce the performance criteria for LID BMP design capture volume, the depth of water that can be stored is also reduced. 24-hrs 48-hrs 7 Compute design capture volume, DCV (ft3): 6,099 DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24-hr = 1.582; 48-hr = 1.963) Compute separate DCV for each outlet from the project site per schematic drawn in Form 3-1 Item 2 Water Quality Management Plan (WQMP) 4-11 Form 4.2-1a LID BMP Performance Criteria for Design Capture Volume (DMA C) 1 Project area DA 3 (ft2): 4,740 2 Imperviousness after applying preventative site design practices (Imp%): 0.672 3 Runoff Coefficient (Rc): 0.831 Rc = 0.858(Imp%)^3-0.78(Imp%)^2+0.774(Imp%)+0.04 4 Determine 1-hour rainfall depth for a 2-year return period P2yr-1hr (in): 0.541 http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 0.80 P6 = Item 4 *C1, where C1 is a function of site climatic region specified in Form 3-1 Item 1 (Valley = 1.4807; Mountain = 1.909; Desert = 1.2371) 6 Drawdown Rate Use 48 hours as the default condition. Selection and use of the 24 hour drawdown time condition is subject to approval by the local jurisdiction. The necessary BMP footprint is a function of drawdown time. While shorter drawdown times reduce the performance criteria for LID BMP design capture volume, the depth of water that can be stored is also reduced. 24-hrs 48-hrs 7 Compute design capture volume, DCV (ft3): 291 DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24-hr = 1.582; 48-hr = 1.963) Compute separate DCV for each outlet from the project site per schematic drawn in Form 3-1 Item 2 Water Quality Management Plan (WQMP) 4-12 Form 4.2-1a LID BMP Performance Criteria for Design Capture Volume (DMA D) 1 Project area DA 4 (ft2): 12,492 2 Imperviousness after applying preventative site design practices (Imp%): 0.940 3 Runoff Coefficient (Rc): 0.831 Rc = 0.858(Imp%)^3-0.78(Imp%)^2+0.774(Imp%)+0.04 4 Determine 1-hour rainfall depth for a 2-year return period P2yr-1hr (in): 0.541 http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 0.80 P6 = Item 4 *C1, where C1 is a function of site climatic region specified in Form 3-1 Item 1 (Valley = 1.4807; Mountain = 1.909; Desert = 1.2371) 6 Drawdown Rate Use 48 hours as the default condition. Selection and use of the 24 hour drawdown time condition is subject to approval by the local jurisdiction. The necessary BMP footprint is a function of drawdown time. While shorter drawdown times reduce the performance criteria for LID BMP design capture volume, the depth of water that can be stored is also reduced. 24-hrs 48-hrs 7 Compute design capture volume, DCV (ft3): 1,294 DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24-hr = 1.582; 48-hr = 1.963) Compute separate DCV for each outlet from the project site per schematic drawn in Form 3-1 Item 2 Water Quality Management Plan (WQMP) 4-13 Form 4.2-2 Summary of HCOC Assessment Does project have the potential to cause or contribute to an HCOC in a downstream channel: Yes No Go to: http://permitrack.sbcounty.gov/wap/ If “Yes”, then complete HCOC assessment of site hydrology for 2yr storm event using Forms 4.2-3 through 4.2-5 and insert results below (Forms 4.2-3 through 4.2-5 may be replaced by computer software analysis based on the San Bernardino County Hydrology Manual) If “No,” then proceed to Section 4.3 Project Conformance Analysis Condition Runoff Volume (ft3) Time of Concentration (min) Peak Runoff (cfs) Pre-developed 1 Form 4.2-3 Item 12 2 Form 4.2-4 Item 13 3 Form 4.2-5 Item 10 Post-developed 4 Form 4.2-3 Item 13 5 Form 4.2-4 Item 14 6 Form 4.2-5 Item 14 Difference 7 Item 4 – Item 1 8 Item 2 – Item 5 9 Item 6 – Item 3 Difference (as % of pre-developed) 10 % Item 7 / Item 1 11 % Item 8 / Item 2 12 % Item 9 / Item 3 THE PROJECT SITE IS WITHIN HCOC EXEMPT AREAS PER CITY OF FONTANA WQMP HANDBOOK FIGURE 2-2 HCOC EXEMPT AREAS. SEE APPENDIX A FOR MORE INFORMATION. Water Quality Management Plan (WQMP) 4-14 Form 4.2-3 HCOC Assessment for Runoff Volume Weighted Curve Number Determination for: Pre-developed DA DMA A DMA B DMA C DMA D DMA E DMA F DMA G DMA H 1a Land Cover type 2a Hydrologic Soil Group (HSG) 3a DMA Area, ft2 sum of areas of DMA should equal area of DA 4a Curve Number (CN) use Items 1 and 2 to select the appropriate CN from Appendix C-2 of the TGD for WQMP Weighted Curve Number Determination for: Post-developed DA DMA A DMA B DMA C DMA D DMA E DMA F DMA G DMA H 1b Land Cover type 2b Hydrologic Soil Group (HSG) 3b DMA Area, ft2 sum of areas of DMA should equal area of DA 4b Curve Number (CN) use Items 5 and 6 to select the appropriate CN from Appendix C-2 of the TGD for WQMP 5 Pre-Developed area-weighted CN: 7 Pre-developed soil storage capacity, S (in): S = (1000 / Item 5) - 10 9 Initial abstraction, Ia (in): Ia = 0.2 * Item 7 6 Post-Developed area-weighted CN: 8 Post-developed soil storage capacity, S (in): S = (1000 / Item 6) - 10 10 Initial abstraction, Ia (in): Ia = 0.2 * Item 8 11 Precipitation for 2 yr, 24 hr storm (in): Go to: http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 12 Pre-developed Volume (ft3): Vpre =(1 / 12) * (Item sum of Item 3) * [(Item 11 – Item 9)^2 / ((Item 11 – Item 9 + Item 7) 13 Post-developed Volume (ft3): Vpre =(1 / 12) * (Item sum of Item 3) * [(Item 11 – Item 10)^2 / ((Item 11 – Item 10 + Item 8) 14 Volume Reduction needed to meet HCOC Requirement, (ft3): VHCOC = (Item 13 * 0.95) – Item 12 Water Quality Management Plan (WQMP) 4-15 Form 4.2-4 HCOC Assessment for Time of Concentration Compute time of concentration for pre and post developed conditions for each DA (For projects using the Hydrology Manual complete the form below) Variables Pre-developed DA1 Use additional forms if there are more than 4 DMA Post-developed DA1 Use additional forms if there are more than 4 DMA DMA A DMA B DMA C DMA D DMA A DMA B DMA C DMA D 1 Length of flowpath (ft) Use Form 3-2 Item 5 for pre-developed condition 2 Change in elevation (ft) 3 Slope (ft/ft), So = Item 2 / Item 1 4 Land cover 5 Initial DMA Time of Concentration (min) Appendix C-1 of the TGD for WQMP 6 Length of conveyance from DMA outlet to project site outlet (ft) May be zero if DMA outlet is at project site outlet 7 Cross-sectional area of channel (ft2) 8 Wetted perimeter of channel (ft) 9 Manning’s roughness of channel (n) 10 Channel flow velocity (ft/sec) Vfps = (1.49 / Item 9) * (Item 7/Item 8)^0.67 * (Item 3)^0.5 11 Travel time to outlet (min) Tt = Item 6 / (Item 10 * 60) 12 Total time of concentration (min) Tc = Item 5 + Item 11 13 Pre-developed time of concentration (min): Minimum of Item 12 pre-developed DMA 14 Post-developed time of concentration (min): Minimum of Item 12 post-developed DMA 15 Additional time of concentration needed to meet HCOC requirement (min): TC-HCOC = (Item 13 * 0.95) – Item 14 Water Quality Management Plan (WQMP) 4-16 Form 4.2-5 HCOC Assessment for Peak Runoff Compute peak runoff for pre- and post-developed conditions Variables Pre-developed DA to Project Outlet (Use additional forms if more than 3 DMA) Post-developed DA to Project Outlet (Use additional forms if more than 3 DMA) DMA A DMA B DMA C DMA A DMA B DMA C 1 Rainfall Intensity for storm duration equal to time of concentration Ipeak = 10^(LOG Form 4.2-1 Item 4 - 0.6 LOG Form 4.2-4 Item 5 /60) 2 Drainage Area of each DMA (Acres) For DMA with outlet at project site outlet, include upstream DMA (Using example schematic in Form 3-1, DMA A will include drainage from DMA C) 3 Ratio of pervious area to total area For DMA with outlet at project site outlet, include upstream DMA (Using example schematic in Form 3-1, DMA A will include drainage from DMA C) 4 Pervious area infiltration rate (in/hr) Use pervious area CN and antecedent moisture condition with Appendix C-3 of the TGD for WQMP 5 Maximum loss rate (in/hr) Fm = Item 3 * Item 4 Use area-weighted Fm from DMA with outlet at project site outlet, include upstream DMA (Using example schematic in Form 3-1, DMA A will include drainage from DMA C) 6 Peak Flow from DMA (cfs) Qp =Item 2 * 0.9 * (Item 1 - Item 5) 7 Time of concentration adjustment factor for other DMA to site discharge point Form 4.2-4 Item 12 DMA / Other DMA upstream of site discharge point (If ratio is greater than 1.0, then use maximum value of 1.0) DMA A n/a n/a DMA B n/a n/a DMA C n/a n/a 8 Pre-developed Qp at Tc for DMA A: Qp = Item 6DMAA + [Item 6DMAB * (Item 1DMAA - Item 5DMAB)/(Item 1DMAB - Item 5DMAB)* Item 7DMAA/2] + [Item 6DMAC * (Item 1DMAA - Item 5DMAC)/(Item 1DMAC - Item 5DMAC)* Item 7DMAA/3] 9 Pre-developed Qp at Tc for DMA B: Qp = Item 6DMAB + [Item 6DMAA * (Item 1DMAB - Item 5DMAA)/(Item 1DMAA - Item 5DMAA)* Item 7DMAB/1] + [Item 6DMAC * (Item 1DMAB - Item 5DMAC)/(Item 1DMAC - Item 5DMAC)* Item 7DMAB/3] 10 Pre-developed Qp at Tc for DMA C: Qp = Item 6DMAC + [Item 6DMAA * (Item 1DMAC - Item 5DMAA)/(Item 1DMAA - Item 5DMAA)* Item 7DMAC/1] + [Item 6DMAB * (Item 1DMAC - Item 5DMAB)/(Item 1DMAB - Item 5DMAB)* Item 7DMAC/2] 10 Peak runoff from pre-developed condition confluence analysis (cfs): Maximum of Item 8, 9, and 10 (including additional forms as needed) 11 Post-developed Qp at Tc for DMA A: Same as Item 8 for post-developed values 12 Post-developed Qp at Tc for DMA B: Same as Item 9 for post-developed values 13 Post-developed Qp at Tc for DMA C: Same as Item 10 for post-developed values 14 Peak runoff from post-developed condition confluence analysis (cfs): Maximum of Item 11, 12, and 13 (including additional forms as needed) 15 Peak runoff reduction needed to meet HCOC Requirement (cfs): Qp-HCOC = (Item 14 * 0.95) – Item 10 Water Quality Management Plan (WQMP) 4-17 4.3 Project Conformance Analysis Complete the following forms for each project site DA to document that the proposed LID BMPs conform to the project DCV developed to meet performance criteria specified in the MS4 Permit (WQMP Template Section 4.2). For the LID DCV, the forms are ordered according to hierarchy of BMP selection as required by the MS4 Permit (see Section 5.3.1 in the TGD for WQMP). The forms compute the following for on-site LID BMP:  Site Design and Hydrologic Source Controls (Form 4.3-2)  Retention and Infiltration (Form 4.3-3)  Harvested and Use (Form 4.3-4) or  Biotreatment (Form 4.3-5). At the end of each form, additional fields facilitate the determination of the extent of mitigation provided by the specific BMP category, allowing for use of the next category of BMP in the hierarchy, if necessary. The first step in the analysis, using Section 5.3.2.1 of the TGD for WQMP, is to complete Forms 4.3-1 and 4.3-3) to determine if retention and infiltration BMPs are infeasible for the project. For each feasibility criterion in Form 4.3-1, if the answer is “Yes,” provide all study findings that includes relevant calculations, maps, data sources, etc. used to make the determination of infeasibility. Next, complete Forms 4.3-2 and 4.3-4 to determine the feasibility of applicable HSC and harvest and use BMPs, and, if their implementation is feasible, the extent of mitigation of the DCV. If no site constraints exist that would limit the type of BMP to be implemented in a DA, evaluate the use of combinations of LID BMPs, including all applicable HSC BMPs to maximize on-site retention of the DCV. If no combination of BMP can mitigate the entire DCV, implement the single BMP type, or combination of BMP types, that maximizes on-site retention of the DCV within the minimum effective area. If the combination of LID HSC, retention and infiltration, and harvest and use BMPs are unable to mitigate the entire DCV, then biotreatment BMPs may be implemented by the project proponent. If biotreatment BMPs are used, then they must be sized to provide sufficient capacity for effective treatment of the remainder of the volume-based performance criteria that cannot be achieved with LID BMPs (TGD for WQMP Section 5.4.4.2). Under no circumstances shall any portion of the DCV be released from the site without effective mitigation and/or treatment. See Section 4.4 for Alternative Compliance (Approved Regional BMP). Water Quality Management Plan (WQMP) 4-18 Form 4.3-1 Infiltration BMP Feasibility (DAs 1-4) Feasibility Criterion – Complete evaluation for each DA on the Project Site 1 Would infiltration BMP pose significant risk for groundwater related concerns? Yes No Refer to Section 5.3.2.1 of the TGD for WQMP If Yes, Provide basis: (attach) 2 Would installation of infiltration BMP significantly increase the risk of geotechnical hazards? Yes No (Yes, if the answer to any of the following questions is yes, as established by a geotechnical expert): · The location is less than 50 feet away from slopes steeper than 15 percent · The location is less than eight feet from building foundations or an alternative setback. · A study certified by a geotechnical professional or an available watershed study determines that stormwater infiltration would result in significantly increased risks of geotechnical hazards. If Yes, Provide basis: (attach) 3 Would infiltration of runoff on a Project site violate downstream water rights? Yes No If Yes, Provide basis: (attach) 4 Is proposed infiltration facility located on hydrologic soil group (HSG) D soils or does the site geotechnical investigation indicate presence of soil characteristics, which support categorization as D soils? Yes No If Yes, Provide basis: (attach) 5 Is the design infiltration rate, after accounting for safety factor of 2.0, below proposed facility less than 0.3 in/hr (accounting for soil amendments)? Yes No If Yes, Provide basis: (attach) 6 Would on-site infiltration or reduction of runoff over pre-developed conditions be partially or fully inconsistent with watershed management strategies as defined in the WAP, or impair beneficial uses? Yes No See Section 3.5 of the TGD for WQMP and WAP If Yes, Provide basis: (attach) 7 Any answer from Item 1 through Item 3 is “Yes”: Yes No If yes, infiltration of any volume is not feasible onsite. Proceed to Form 4.3-4, Harvest and Use BMP. If no, then proceed to Item 8 below. 8 Any answer from Item 4 through Item 6 is “Yes”: Yes No If yes, infiltration is permissible but is not required to be considered. Proceed to Form 4.3-2, Hydrologic Source Control BMP. If no, then proceed to Item 9, below. 9 All answers to Item 1 through Item 6 are “No”: Infiltration of the full DCV is potentially feasible, LID infiltration BMP must be designed to infiltrate the full DCV to the MEP. Proceed to Form 4.3-2, Hydrologic Source Control BMP. Water Quality Management Plan (WQMP) 4-19 4.3.1 Site Design Hydrologic Source Control BMP Section XI.E. of the Permit emphasizes the use of LID preventative measures; and the use of LID HSC BMPs reduces the portion of the DCV that must be addressed in downstream BMPs. Therefore, all applicable HSC shall be provided except where they are mutually exclusive with each other, or with other BMPs. Mutual exclusivity may result from overlapping BMP footprints such that either would be potentially feasible by itself, but both could not be implemented. Please note that while there are no numeric standards regarding the use of HSC, if a project cannot feasibly meet BMP sizing requirements or cannot fully address HCOCs, feasibility of all applicable HSC must be part of demonstrating that the BMP system has been designed to retain the maximum feasible portion of the DCV. Complete Form 4.3-2 to identify and calculate estimated retention volume from implementing site design HSC BMP. Refer to Section 5.4.1 in the TGD for more detailed guidance. Form 4.3-2 Site Design Hydrologic Source Control BMPs 1 Implementation of Impervious Area Dispersion BMP (i.e. routing runoff from impervious to pervious areas), excluding impervious areas planned for routing to on-lot infiltration BMP: Yes No If yes, complete Items 2-5; If no, proceed to Item 6 DA DMA BMP Type DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) 2 Total impervious area draining to pervious area (ft2) 3 Ratio of pervious area receiving runoff to impervious area 4 Retention volume achieved from impervious area dispersion (ft3) V = Item2 * Item 3 * (0.5/12), assuming retention of 0.5 inches of runoff 5 Sum of retention volume achieved from impervious area dispersion (ft3): Vretention =Sum of Item 4 for all BMPs 6 Implementation of Localized On-lot Infiltration BMPs (e.g. on-lot rain gardens): Yes No If yes, complete Items 7- 13 for aggregate of all on-lot infiltration BMP in each DA; If no, proceed to Item 14 DA DMA BMP Type DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) 7 Ponding surface area (ft2) 8 Ponding depth (ft) 9 Surface area of amended soil/gravel (ft2) 10 Average depth of amended soil/gravel (ft) 11 Average porosity of amended soil/gravel 12 Retention volume achieved from on-lot infiltration (ft3) Vretention = (Item 7 *Item 8) + (Item 9 * Item 10 * Item 11) 13 Runoff volume retention from on-lot infiltration (ft3): Vretention =Sum of Item 12 for all BMPs Water Quality Management Plan (WQMP) 4-20 Form 4.3-2 Site Design Hydrologic Source Control BMPs Form 4.3-2 cont. Site Design Hydrologic Source Control BMPs 14 Implementation of evapotranspiration BMP (green, brown, or blue roofs): Yes No If yes, complete Items 15-20. If no, proceed to Item 21 DA DMA BMP Type DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) 15 Rooftop area planned for ET BMP (ft2) 16 Average wet season ET demand (in/day) Use local values, typical ~ 0.1 17 Daily ET demand (ft3/day) Item 15 * (Item 16 / 12) 18 Drawdown time (hrs) Copy Item 6 in Form 4.2-1 19 Retention Volume (ft3) Vretention = Item 17 * (Item 18 / 24) 20 Runoff volume retention from evapotranspiration BMPs (ft3): Vretention =Sum of Item 19 for all BMPs 21 Implementation of Street Trees: Yes No If yes, complete Items 22-25. If no, proceed to Item 26 DA DMA BMP Type DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) 22 Number of Street Trees 23 Average canopy cover over impervious area (ft2) 24 Runoff volume retention from street trees (ft3) Vretention = Item 22 * Item 23 * (0.05/12) assume runoff retention of 0.05 inches 25 Runoff volume retention from street tree BMPs (ft3): Vretention = Sum of Item 24 for all BMPs 26 Implementation of residential rain barrel/cisterns: Yes No If yes, complete Items 27-29; If no, proceed to Item 30 DA DMA BMP Type DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) 27 Number of rain barrels/cisterns 28 Runoff volume retention from rain barrels/cisterns (ft3) Vretention = Item 27 * 3 29 Runoff volume retention from residential rain barrels/Cisterns (ft3): Vretention =Sum of Item 28 for all BMPs 30 Total Retention Volume from Site Design Hydrologic Source Control BMPs: 0 Sum of Items 5, 13, 20, 25 and 29 Water Quality Management Plan (WQMP) 4-21 4.3.2 Infiltration BMPs Use Form 4.3-3 to compute on-site retention of runoff from proposed retention and infiltration BMPs. Volume retention estimates are sensitive to the percolation rate used, which determines the amount of runoff that can be infiltrated within the specified drawdown time. The infiltration safety factor reduces field measured percolation to account for potential inaccuracy associated with field measurements, declining BMP performance over time, and compaction during construction. Appendix D of the TGD for WQMP provides guidance on estimating an appropriate safety factor to use in Form 4.3-3. If site constraints limit the use of BMPs to a single type and implementation of retention and infiltration BMPs mitigate no more than 40% of the DCV, then they are considered infeasible and the Project Proponent may evaluate the effectiveness of BMPs lower in the LID hierarchy of use (Section 5.5.1 of the TGD for WQMP) If implementation of infiltrations BMPs is feasible as determined using Form 4.3-1, then LID infiltration BMPs shall be implemented to the MEP (section 4.1 of the TGD for WQMP). Water Quality Management Plan (WQMP) 4-22 Form 4.3-3 Infiltration LID BMP - including underground BMPs 1 Remaining LID DCV not met by site design HSC BMP (ft3): 29,858 Vunmet = Form 4.2-1 Item 7 - Form 4.3-2 Item 30 BMP Type Use columns to the right to compute runoff volume retention from proposed infiltration BMP (select BMP from Table 5-4 in TGD for WQMP) - Use additional forms for more BMPs DA 1 DMA A BMP Type Underground Infiltration Basin DA 2 DMA B BMP Type Undeground Infiltration Basin DA 3 DMA C BMP Type Undeground Infiltration Basin DA 4 DMA D BMP Type Undeground Infiltration Basin 2 Infiltration rate of underlying soils (in/hr) See Section 5.4.2 and Appendix D of the TGD for WQMP for minimum requirements for assessment methods 2 2 2 2 3 Infiltration safety factor See TGD Section 5.4.2 and Appendix D; see Worksheet H in following page 2.5 2.5 2.5 2.5 4 Design percolation rate (in/hr) Pdesign = Item 2 / Item 3 0.8 0.8 0.8 0.8 5 Ponded water drawdown time (hr) Copy Item 6 in Form 4.2-1 48 48 48 48 6 Maximum ponding depth (ft) BMP specific, see Table 5-4 of the TGD for WQMP for BMP design details 3.75 3.75 0.5 3.75 7 Ponding Depth (ft) dBMP = Minimum of (1/12*Item 4*Item 5) or Item 6 3.2 3.2 0.5 3.2 8 Infiltrating surface area, SABMP (ft2) the lesser of the area needed for infiltration of full DCV or minimum space requirements from Table 5.7 of the TGD for WQMP 904 3,594 804 904 9 Amended soil depth, dmedia (ft) Only included in certain BMP types, see Table 5-4 in the TGD for WQMP for reference to BMP design details N/A N/A N/A N/A 10 Amended soil porosity N/A N/A N/A N/A 11 Gravel depth, dmedia (ft) Only included in certain BMP types, see Table 5-4 of the TGD for WQMP for BMP design details 0.75 0.75 0.75 0.75 12 Gravel porosity 40% 40% 40% 40% 13 Duration of storm as basin is filling (hrs) Typical ~ 3hrs 3 3 3 3 14 Above Ground Retention Volume (ft3) Vretention = Item 8 * [Item7 + (Item 9 * Item 10) + (Item 11 * Item 12) + (Item 13 * (Item 4 / 12))] N/A N/A 470 N/A 15 Underground Retention Volume (ft3) Volume determined using manufacturer’s specifications and calculations 1,598 6,963 N/A 1,598 16 Total Retention Volume from LID Infiltration BMPs: 10,629 (Sum of Items 14 and 15 for all infiltration BMP included in plan) 17 Fraction of DCV achieved with infiltration BMP: 100% Retention% = Item 16 / Form 4.2-1 Item 7 18 Is full LID DCV retained onsite with combination of hydrologic source control and LID retention/infiltration BMPs? Yes No Water Quality Management Plan (WQMP) 4-23 4.3.3 Harvest and Use BMP Harvest and use BMP may be considered if the full LID DCV cannot be met by maximizing infiltration BMPs. Use Form 4.3-4 to compute on-site retention of runoff from proposed harvest and use BMPs. Volume retention estimates for harvest and use BMPs are sensitive to the on-site demand for captured stormwater. Since irrigation water demand is low in the wet season, when most rainfall events occur in San Bernardino County, the volume of water that can be used within a specified drawdown period is relatively low. The bottom portion of Form 4.3-4 facilitates the necessary computations to show infeasibility if a minimum incremental benefit of 40 percent of the LID DCV would not be achievable with MEP implementation of on-site harvest and use of stormwater (Section 5.5.4 of the TGD for WQMP). If yes, demonstrate conformance using Form 4.3-10; If no, then reduce Item 3, Factor of Safety to 2.0 and increase Item 8, Infiltrating Surface Area, such that the portion of the site area used for retention and infiltration BMPs equals or exceeds the minimum effective area thresholds (Table 5-7 of the TGD for WQMP) for the applicable category of development and repeat all above calculations. Form 4.3-4 Harvest and Use BMPs 1 Remaining LID DCV not met by site design HSC or infiltration BMP (ft3): N/A Vunmet = Form 4.2-1 Item 7 - Form 4.3-2 Item 30 – Form 4.3-3 Item 16 BMP Type(s) Compute runoff volume retention from proposed harvest and use BMP (Select BMPs from Table 5-4 of the TGD for WQMP) - Use additional forms for more BMPs DA DMA BMP Type DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) 2 Describe cistern or runoff detention facility 3 Storage volume for proposed detention type (ft3) Volume of cistern 4 Landscaped area planned for use of harvested stormwater (ft2) 5 Average wet season daily irrigation demand (in/day) Use local values, typical ~ 0.1 in/day 6 Daily water demand (ft3/day) Item 4 * (Item 5 / 12) 7 Drawdown time (hrs) Copy Item 6 from Form 4.2-1 8Retention Volume (ft3) Vretention = Minimum of (Item 3) or (Item 6 * (Item 7 / 24)) 9 Total Retention Volume (ft3) from Harvest and Use BMP Sum of Item 8 for all harvest and use BMP included in plan 10 Is the full DCV retained with a combination of LID HSC, retention and infiltration, and harvest & use BMPs? Yes No If yes, demonstrate conformance using Form 4.3-10. If no, then re-evaluate combinations of all LID BMP and optimize their implementation such that the maximum portion of the DCV is retained on-site (using a single BMP type or combination of BMP types). If the full DCV cannot be mitigated after this optimization process, proceed to Section 4.3.4. Water Quality Management Plan (WQMP) 4-24 Water Quality Management Plan (WQMP) 4-25 4.3.4 Biotreatment BMP Biotreatment BMPs may be considered if the full LID DCV cannot be met by maximizing retention and infiltration, and harvest and use BMPs. A key consideration when using biotreatment BMP is the effectiveness of the proposed BMP in addressing the pollutants of concern for the project (see Table 5-5 of the TGD for WQMP). Use Form 4.3-5 to summarize the potential for volume based and/or flow based biotreatment options to biotreat the remaining unmet LID DCV w. Biotreatment computations are included as follows: · Use Form 4.3-6 to compute biotreatment in small volume based biotreatment BMP (e.g. bioretention w/underdrains); · Use Form 4.3-7 to compute biotreatment in large volume based biotreatment BMP (e.g. constructed wetlands); · Use Form 4.3-8 to compute sizing criteria for flow-based biotreatment BMP (e.g. bioswales) Form 4.3-5 Selection and Evaluation of Biotreatment BMP 1 Remaining LID DCV not met by site design HSC, infiltration, or harvest and use BMP for potential biotreatment (ft3): N/A Form 4.2-1 Item 7 - Form 4.3-2 Item 30 – Form 4.3-3 Item 16- Form 4.3-4 Item 9 List pollutants of concern Copy from Form 2.3-1. 2 Biotreatment BMP Selected (Select biotreatment BMP(s) necessary to ensure all pollutants of concern are addressed through Unit Operations and Processes, described in Table 5-5 of the TGD for WQMP) Volume-based biotreatment Use Forms 4.3-6 and 4.3-7 to compute treated volume Flow-based biotreatment Use Form 4.3-8 to compute treated volume Bioretention with underdrain Planter box with underdrain Constructed wetlands Wet extended detention Dry extended detention Vegetated swale Vegetated filter strip Proprietary biotreatment 3 Volume biotreated in volume based biotreatment BMP (ft3): Form 4.3- 6 Item 15 + Form 4.3-7 Item 13 4 Compute remaining LID DCV with implementation of volume based biotreatment BMP (ft3): Item 1 – Item 3 5 Remaining fraction of LID DCV for sizing flow based biotreatment BMP: % Item 4 / Item 1 6 Flow-based biotreatment BMP capacity provided (cfs): Use Figure 5-2 of the TGD for WQMP to determine flow capacity required to provide biotreatment of remaining percentage of unmet LID DCV (Item 5), for the project’s precipitation zone (Form 3-1 Item 1) 7 Metrics for MEP determination: · Provided a WQMP with the portion of site area used for suite of LID BMP equal to minimum thresholds in Table 5-7 of the TGD for WQMP for the proposed category of development: If maximized on-site retention BMPs is feasible for partial capture, then LID BMP implementation must be optimized to retain and infiltrate the maximum portion of the DCV possible within the prescribed minimum effective area. The remaining portion of the DCV shall then be mitigated using biotreatment BMP. Water Quality Management Plan (WQMP) 4-26 Form 4.3-6 Volume Based Biotreatment– Bioretention and Planter Boxes with Underdrains Biotreatment BMP Type (Bioretention w/underdrain, planter box w/underdrain, other comparable BMP) DA DMA BMP Type DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) 1 Pollutants addressed with BMP List all pollutant of concern that will be effectively reduced through specific Unit Operations and Processes described in Table 5-5 of the TGD for WQMP 2 Amended soil infiltration rate Typical ~ 5.0 3 Amended soil infiltration safety factor Typical ~ 2.0 4 Amended soil design percolation rate (in/hr) Pdesign = Item 2 / Item 3 5 Ponded water drawdown time (hr) Copy Item 6 from Form 4.2-1 6 Maximum ponding depth (ft) see Table 5-6 of the TGD for WQMP for reference to BMP design details 7 Ponding Depth (ft) dBMP = Minimum of (1/12 * Item 4 * Item 5) or Item 6 8 Amended soil surface area (ft2) 9 Amended soil depth (ft) see Table 5-6 of the TGD for WQMP for reference to BMP design details 10 Amended soil porosity, n 11 Gravel depth (ft) see Table 5-6 of the TGD for WQMP for reference to BMP design details 12 Gravel porosity, n 13 Duration of storm as basin is filling (hrs) Typical ~ 3hrs 14 Biotreated Volume (ft3) Vbiotreated = Item 8 * [(Item 7/2) + (Item 9 * Item 10) +(Item 11 * Item 12) + (Item 13 * (Item 4 / 12))] 15 Total biotreated volume from bioretention and/or planter box with underdrains BMP: Sum of Item 14 for all volume-based BMPs included in this form Water Quality Management Plan (WQMP) 4-27 Form 4.3-7 Volume Based Biotreatment– Constructed Wetlands and Extended Detention Biotreatment BMP Type Constructed wetlands, extended wet detention, extended dry detention, or other comparable proprietary BMP. If BMP includes multiple modules (e.g. forebay and main basin), provide separate estimates for storage and pollutants treated in each module. DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) Forebay Basin Forebay Basin 1 Pollutants addressed with BMP forebay and basin List all pollutant of concern that will be effectively reduced through specific Unit Operations and Processes described in Table 5-5 of the TGD for WQMP 2 Bottom width (ft) 3 Bottom length (ft) 4 Bottom area (ft2) Abottom = Item 2 * Item 3 5 Side slope (ft/ft) 6 Depth of storage (ft) 7 Water surface area (ft2) Asurface =(Item 2 + (2 * Item 5 * Item 6)) * (Item 3 + (2 * Item 5 * Item 6)) 8 Storage volume (ft3) For BMP with a forebay, ensure fraction of total storage is within ranges specified in BMP specific fact sheets, see Table 5-6 of the TGD for WQMP for reference to BMP design details V =Item 6 / 3 * [Item 4 + Item 7 + (Item 4 * Item 7)^0.5] 9 Drawdown Time (hrs) Copy Item 6 from Form 2.1 10 Outflow rate (cfs) QBMP = (Item 8forebay + Item 8basin) / (Item 9 * 3600) 11 Duration of design storm event (hrs) 12 Biotreated Volume (ft3) Vbiotreated = (Item 8forebay + Item 8basin) +( Item 10 * Item 11 * 3600) 13 Total biotreated volume from constructed wetlands, extended dry detention, or extended wet detention : (Sum of Item 12 for all BMP included in plan) Water Quality Management Plan (WQMP) 4-28 4.3.5 Conformance Summary Complete Form 4.3-9 to demonstrate how on-site LID DCV is met with proposed site design hydrologic source control, infiltration, harvest and use, and/or biotreatment BMP. The bottom line of the form is used to describe the basis for infeasibility determination for on-site LID BMP to achieve full LID DCV, and provides methods for Form 4.3-8 Flow Based Biotreatment Biotreatment BMP Type Vegetated swale, vegetated filter strip, or other comparable proprietary BMP DA DMA BMP Type DA DMA BMP Type DA DMA BMP Type (Use additional forms for more BMPs) 1 Pollutants addressed with BMP List all pollutant of concern that will be effectively reduced through specific Unit Operations and Processes described in TGD Table 5-5 2 Flow depth for water quality treatment (ft) BMP specific, see Table 5-6 of the TGD for WQMP for reference to BMP design details 3 Bed slope (ft/ft) BMP specific, see Table 5-6 of the TGD for WQMP for reference to BMP design details 4 Manning's roughness coefficient 5 Bottom width (ft) bw = (Form 4.3-5 Item 6 * Item 4) / (1.49 * Item 2^1.67 * Item 3^0.5) 6 Side Slope (ft/ft) BMP specific, see Table 5-6 of the TGD for WQMP for reference to BMP design details 7 Cross sectional area (ft2) A = (Item 5 * Item 2) + (Item 6 * Item 2^2) 8 Water quality flow velocity (ft/sec) V = Form 4.3-5 Item 6 / Item 7 9 Hydraulic residence time (min) Pollutant specific, see Table 5-6 of the TGD for WQMP for reference to BMP design details 10 Length of flow based BMP (ft) L = Item 8 * Item 9 * 60 11 Water surface area at water quality flow depth (ft2) SAtop = (Item 5 + (2 * Item 2 * Item 6)) * Item 10 Water Quality Management Plan (WQMP) 5-29 computing remaining volume to be addressed in an alternative compliance plan. If the project has more than one outlet, then complete additional versions of this form for each outlet. Form 4.3-9 Conformance Summary and Alternative Compliance Volume Estimate 1 Total LID DCV for the Project (ft3): 8,235 Copy Item 7 in Form 4.2-1 2 On-site retention with site design hydrologic source control LID BMP (ft3): 0 Copy Item 30 in Form 4.3-2 3 On-site retention with LID infiltration BMP (ft3): 8,561 Copy Item 16 in Form 4.3-3 4 On-site retention with LID harvest and use BMP (ft3): N/A Copy Item 9 in Form 4.3-4 5 On-site biotreatment with volume based biotreatment BMP (ft3): N/A Copy Item 3 in Form 4.3-5 6 Flow capacity provided by flow based biotreatment BMP (cfs): N/A Copy Item 6 in Form 4.3-5 7 LID BMP performance criteria are achieved if answer to any of the following is “Yes”: · Full retention of LID DCV with site design HSC, infiltration, or harvest and use BMP: Yes No If yes, sum of Items 2, 3, and 4 is greater than Item 1 · Combination of on-site retention BMPs for a portion of the LID DCV and volume-based biotreatment BMP that address all pollutants of concern for the remaining LID DCV: Yes No If yes, a) sum of Items 2, 3, 4, and 5 is greater than Item 1, and Items 2, 3 and 4 are maximized; or b) Item 6 is greater than Form 4.3--5 Item 6 and Items 2, 3 and 4 are maximized  On-site retention and infiltration is determined to be infeasible and biotreatment BMP provide biotreatment for all pollutants of concern for full LID DCV: Yes No If yes, Form 4.3-1 Items 7 and 8 were both checked yes 8 If the LID DCV is not achieved by any of these means, then the project may be allowed to develop an alternative compliance plan. Check box that describes the scenario which caused the need for alternative compliance: · Combination of HSC, retention and infiltration, harvest and use, and biotreatment BMPs provide less than full LID DCV capture: Checked yes for Form 4.3-5 Item 7, Item 6 is zero, and sum of Items 2, 3, 4, and 5 is less than Item 1. If so, apply water quality credits and calculate volume for alternative compliance, Valt = (Item 1 – Item 2 – Item 3 – Item 4 – Item 5) * (100 - Form 2.4-1 Item 2)% · An approved Watershed Action Plan (WAP) demonstrates that water quality and hydrologic impacts of urbanization are more effective when managed in at an off-site facility: Attach appropriate WAP section, including technical documentation, showing effectiveness comparisons for the project site and regional watershed See Section 4.4 Water Quality Management Plan (WQMP) 5-30 4.3.6 Hydromodification Control BMP Use Form 4.3-10 to compute the remaining runoff volume retention, after LID BMP are implemented, needed to address HCOC, and the increase in time of concentration and decrease in peak runoff necessary to meet targets for protection of waterbodies with a potential HCOC. Describe hydromodification control BMP that address HCOC, which may include off-site BMP and/or in-stream controls. Section 5.6 of the TGD for WQMP provides additional details on selection and evaluation of hydromodification control BMP. Form 4.3-10 Hydromodification Control BMPs 1 Volume reduction needed for HCOC performance criteria (ft3): (Form 4.2-2 Item 4 * 0.95) – Form 4.2-2 Item 1 2 On-site retention with site design hydrologic source control, infiltration, and harvest and use LID BMP (ft3): Sum of Form 4.3-9 Items 2, 3, and 4 Evaluate option to increase implementation of on-site retention in Forms 4.3-2, 4.3-3, and 4.3-4 in excess of LID DCV toward achieving HCOC volume reduction 3 Remaining volume for HCOC volume capture (ft3): Item 1 – Item 2 4 Volume capture provided by incorporating additional on-site or off-site retention BMPs (ft3): N/A Existing downstream BMP may be used to demonstrate additional volume capture (if so, attach to this WQMP a hydrologic analysis showing how the additional volume would be retained during a 2-yr storm event for the regional watershed) 5 If Item 4 is less than Item 3, incorporate in-stream controls on downstream waterbody segment to prevent impacts due to hydromodification Attach in-stream control BMP selection and evaluation to this WQMP 6 Is Form 4.2-2 Item 11 less than or equal to 5%: Yes No If yes, HCOC performance criteria is achieved. If no, select one or more mitigation options below: · Demonstrate increase in time of concentration achieved by proposed LID site design, LID BMP, and additional on-site or off-site retention BMP BMP upstream of a waterbody segment with a potential HCOC may be used to demonstrate increased time of concentration through hydrograph attenuation (if so, show that the hydraulic residence time provided in BMP for a 2-year storm event is equal or greater than the addition time of concentration requirement in Form 4.2-4 Item 15) · Increase time of concentration by preserving pre-developed flow path and/or increase travel time by reducing slope and increasing cross-sectional area and roughness for proposed on-site conveyance facilities · Incorporate appropriate in-stream controls for downstream waterbody segment to prevent impacts due to hydromodification, in a plan approved and signed by a licensed engineer in the State of California 7 Form 4.2-2 Item 12 less than or equal to 5%: Yes No If yes, HCOC performance criteria is achieved. If no, select one or more mitigation options below: · Demonstrate reduction in peak runoff achieved by proposed LID site design, LID BMPs, and additional on-site or off- site retention BMPs BMPs upstream of a waterbody segment with a potential HCOC may be used to demonstrate additional peak runoff reduction through hydrograph attenuation (if so, attach to this WQMP, a hydrograph analysis showing how the peak runoff would be reduced during a 2-yr storm event) · Incorporate appropriate in-stream controls for downstream waterbody segment to prevent impacts due to hydromodification, in a plan approved and signed by a licensed engineer in the State of California Water Quality Management Plan (WQMP) 5-31 4.4 Alternative Compliance Plan (if applicable) Describe an alternative compliance plan (if applicable) for projects not fully able to infiltrate, harvest and use, or biotreat the DCV via on-site LID practices. A project proponent must develop an alternative compliance plan to address the remainder of the LID DCV. Depending on project type some projects may qualify for water quality credits that can be applied to reduce the DCV that must be treated prior to development of an alternative compliance plan (see Form 2.4-1, Water Quality Credits). Form 4.3-9 Item 8 includes instructions on how to apply water quality credits when computing the DCV that must be met through alternative compliance. Alternative compliance plans may include one or more of the following elements: · On-site structural treatment control BMP - All treatment control BMP should be located as close to possible to the pollutant sources and should not be located within receiving waters; · Off-site structural treatment control BMP - Pollutant removal should occur prior to discharge of runoff to receiving waters; · Urban runoff fund or In-lieu program, if available Depending upon the proposed alternative compliance plan, approval by the executive officer may or may not be required (see Section 6 of the TGD for WQMP). Water Quality Management Plan (WQMP) 5-1 Section 5 Inspection and Maintenance Responsibility for Post Construction BMP All BMP included as part of the project WQMP are required to be maintained through regular scheduled inspection and maintenance (refer to Section 8, Post Construction BMP Requirements, in the TGD for WQMP). Fully complete Form 5-1 summarizing all BMP included in the WQMP. Attach additional forms as needed. The WQMP shall also include a detailed Operation and Maintenance Plan for all BMP and may require a Maintenance Agreement (consult the jurisdiction’s LIP). If a Maintenance Agreement is required, it must also be attached to the WQMP. Water Quality Management Plan (WQMP) 5-2 Form 5-1 BMP Inspection and Maintenance (use additional forms as necessary) BMP Reponsible Party(s) Inspection/ Maintenance Activities Required Minimum Frequency of Activities S1 – Provide storm drain system stenciling and signage (CASQA BMP SD-13) Owner Replace when the stenciling and signage fades to maintain legibility. Biannually as necessary S3 – Design and construct trash and waste storage areas including a solid canopy-style roof to reduce pollution introduction (CASQA BMP SD-32) Owner Routine inspection of the trash area should be provided by the owner’s representative. Weekly A sign shall be posted requiring that trash container lids be closed after depositing trash Daily Debris shall be swept or wiped clean and deposited into trash receptacles. Weekly Regular trash dumpster pickup Weekly S4 – Use efficient irrigation systems and landscape design, water conservation, smart controllers, and source control (CASQA BMP SD-12) Owner Inspect irrigation equipment for proper operation. Monthly Check water sensors and adjust irrigation heads and timing as necessary Monthly S5 – Finish grade of landscaped areas at a minimum of 1-2 inches below top of curb, sidewalk, or pavement Owner Inspect landscaped areas to assure that the landscaped areas are a minimum of 1- 2 inches below top of curb, sidewalk, or pavement. Monthly S6 - Protect slopes and channels and provide energy dissipation Owner Inspect for erosion of slopes. Monthly and after storm events. N14 – Catch Basin Inspection Program Owner The site owners shall inspect all on-site catch basins on a quarterly frequency for accumulation of sediment, trash, debris, and for evidence of illegal dumping. All catch basins shall be cleaned annually or whenever debris accumulates to a level greater than 25% of sump capacity. Quarterly Water Quality Management Plan (WQMP) 5-3 N15 – Vacuum Sweeping of Private Streets and Parking Lots (CASQA BMPs SC-43 and SC-70) Owner All paved areas of the site shall be vacuum swept by owner’s contractor. Weekly SC-41 Building & Grounds Maintenance Owner Perform regular landscape maintenance that includes trimming and mowing, repair/replacement of damage or diseased vegetation, replanting of bare areas, etc. Perform regular grounds maintenance that includes trash and litter removal, etc. Additional repair activities will be performed as necessary. Weekly SC-44 Drainage System Maintenance Owner Remove any trash, debris, or other obstructions. Make structural repairs as necessary. The drainage system and inlets shall be inspected a minimum of 3 times per year, including once per year, prior to, during, and after the rainy season (Oct. 1st through April 30th). SD-11 Roof Runoff Controls Owner Roof runoff has direct connection to storm drain system. Ensure roof drain and overflow drains are cleaned. Annual inspection and cleaning of rooftop drain inlet and overflow drain. Proprietary BMP – Vortex Separator (Aqua-Swirl Concentrator) Owner Cleaning with vacuum truck. Repair damage to structure as necessary. Twice annually. Proprietary BMP – Underground Infiltration System (Eco-Rain) Owner Removal of any sediments accumulated in the Eco-Rain units. Repair damage to structure as necessary. Twice a year, before and after the wet season Water Quality Management Plan (WQMP) 6-1 Section 6 WQMP Attachments 6.1. Site Plan and Drainage Plan Include a site plan and drainage plan sheet set containing the following minimum information: 6.2 Electronic Data Submittal Minimum requirements include submittal of PDF exhibits in addition to hard copies. Format must not require specialized software to open. If the local jurisdiction requires specialized electronic document formats (as described in their local Local Implementation Plan), this section will describe the contents (e.g., layering, nomenclature, geo-referencing, etc.) of these documents so that they may be interpreted efficiently and accurately. 6.3 Post Construction Attach all O&M Plans and Maintenance Agreements for BMP to the WQMP. 6.4 Other Supporting Documentation  BMP Educational Materials  Activity Restriction – C, C&R’s & Lease Agreement  Project location  Site boundary  Land uses and land covers, as applicable  Suitability/feasibility constraints  Structural Source Control BMP locations  Site Design Hydrologic Source Control BMP locations  LID BMP details  Drainage delineations and flow information  Drainage connections Water Quality Management Plan (WQMP) Section 6.1 Section 6.1 Site Plan and Drainage Plan Water Quality Management Plan (WQMP) Appendix A-1 Appendix A Vicinity Map, Figures, and WQMP Exhibit Water Quality Management Plan (WQMP) Appendix A-2 Vicinity Map City of Fontana WQMP Handbook September 2016 -6 - Figure 2-1 Hydrologic Soil Group City of Fontana WQMP Handbook September 2016 -7 - Figure 2-2 HCOC Exempt Areas City of Fontana WQMP Handbook September 2016 -8 - Figure 2-3 Receiving Waters PROPOSED SELF-STORAGE BUILDING 3-STORY 109,566 S.F. C T NO T F O R C O N S T R U C T I O N Water Quality Management Plan (WQMP) Section 6.4 Appendix B BMP Calculations and Manufacturer Cutsheets NOAA Atlas 14, Volume 6, Version 2 Location name: Fontana, California, USA* Latitude: 34.0703°, Longitude: -117.4306° Elevation: 1124.97 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Duration Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min 0.109 (0.091-0.132) 0.142 (0.118-0.172) 0.187 (0.155-0.228) 0.225 (0.186-0.277) 0.280 (0.222-0.355) 0.323 (0.251-0.419) 0.369 (0.280-0.491) 0.418 (0.308-0.573) 0.487 (0.344-0.697) 0.544 (0.371-0.807) 10-min 0.156 (0.130-0.189) 0.204 (0.169-0.247) 0.268 (0.223-0.327) 0.323 (0.266-0.397) 0.401 (0.319-0.509) 0.463 (0.360-0.601) 0.528 (0.401-0.704) 0.599 (0.441-0.821) 0.698 (0.493-1.00) 0.780 (0.531-1.16) 15-min 0.189 (0.157-0.229) 0.246 (0.205-0.299) 0.325 (0.269-0.395) 0.391 (0.322-0.480) 0.485 (0.385-0.616) 0.560 (0.435-0.727) 0.639 (0.485-0.851) 0.724 (0.533-0.992) 0.845 (0.596-1.21) 0.943 (0.643-1.40) 30-min 0.282 (0.235-0.342) 0.368 (0.307-0.447) 0.486 (0.403-0.591) 0.585 (0.481-0.718) 0.725 (0.576-0.921) 0.837 (0.651-1.09) 0.956 (0.725-1.27) 1.08 (0.798-1.49) 1.26 (0.892-1.81) 1.41 (0.961-2.09) 60-min 0.414 (0.345-0.502) 0.541 (0.450-0.656) 0.712 (0.591-0.867) 0.858 (0.706-1.05) 1.06 (0.846-1.35) 1.23 (0.956-1.60) 1.40 (1.06-1.87) 1.59 (1.17-2.18) 1.85 (1.31-2.65) 2.07 (1.41-3.07) 2-hr 0.616 (0.514-0.747) 0.796 (0.662-0.966) 1.03 (0.859-1.26) 1.23 (1.01-1.51) 1.51 (1.20-1.92) 1.72 (1.34-2.24) 1.95 (1.48-2.59) 2.18 (1.61-2.99) 2.51 (1.77-3.59) 2.77 (1.88-4.10) 3-hr 0.780 (0.650-0.946) 1.00 (0.835-1.22) 1.30 (1.08-1.58) 1.54 (1.27-1.89) 1.87 (1.49-2.38) 2.13 (1.65-2.76) 2.39 (1.81-3.18) 2.66 (1.96-3.65) 3.04 (2.15-4.35) 3.34 (2.27-4.95) 6-hr 1.11 (0.928-1.35) 1.43 (1.19-1.74) 1.84 (1.53-2.24) 2.18 (1.79-2.67) 2.63 (2.09-3.34) 2.97 (2.31-3.85) 3.31 (2.51-4.41) 3.67 (2.70-5.03) 4.14 (2.93-5.93) 4.52 (3.08-6.70) 12-hr 1.48 (1.23-1.80) 1.92 (1.60-2.33) 2.47 (2.05-3.01) 2.91 (2.40-3.58) 3.50 (2.78-4.44) 3.94 (3.06-5.11) 4.37 (3.32-5.82) 4.81 (3.55-6.60) 5.40 (3.81-7.72) 5.84 (3.98-8.66) 24-hr 1.99 (1.76-2.30) 2.61 (2.31-3.01) 3.40 (2.99-3.93) 4.01 (3.51-4.68) 4.82 (4.08-5.81) 5.42 (4.50-6.67) 6.02 (4.87-7.58) 6.61 (5.21-8.56) 7.39 (5.59-9.97) 7.98 (5.84-11.1) 2-day 2.41 (2.13-2.77) 3.23 (2.85-3.72) 4.27 (3.76-4.94) 5.10 (4.46-5.95) 6.20 (5.25-7.47) 7.02 (5.83-8.64) 7.85 (6.35-9.88) 8.67 (6.84-11.2) 9.77 (7.39-13.2) 10.6 (7.76-14.8) 3-day 2.59 (2.29-2.98) 3.53 (3.12-4.07) 4.74 (4.18-5.49) 5.72 (5.00-6.67) 7.03 (5.95-8.47) 8.03 (6.66-9.87) 9.03 (7.31-11.4) 10.1 (7.92-13.0) 11.4 (8.64-15.4) 12.5 (9.13-17.4) 4-day 2.78 (2.46-3.20) 3.83 (3.39-4.42) 5.20 (4.58-6.02) 6.31 (5.52-7.36) 7.81 (6.61-9.41) 8.96 (7.43-11.0) 10.1 (8.20-12.8) 11.3 (8.92-14.7) 12.9 (9.79-17.4) 14.2 (10.4-19.8) 7-day 3.16 (2.80-3.64) 4.43 (3.92-5.11) 6.09 (5.37-7.05) 7.46 (6.52-8.70) 9.32 (7.89-11.2) 10.8 (8.92-13.2) 12.2 (9.90-15.4) 13.7 (10.8-17.8) 15.8 (12.0-21.3) 17.4 (12.8-24.3) 10-day 3.42 (3.03-3.95) 4.84 (4.28-5.59) 6.71 (5.92-7.77) 8.26 (7.22-9.63) 10.4 (8.79-12.5) 12.0 (9.98-14.8) 13.7 (11.1-17.3) 15.5 (12.2-20.1) 17.9 (13.6-24.2) 19.8 (14.5-27.7) 20-day 4.10 (3.63-4.73) 5.87 (5.19-6.77) 8.24 (7.27-9.54) 10.2 (8.95-11.9) 13.0 (11.0-15.7) 15.2 (12.6-18.7) 17.5 (14.2-22.1) 19.9 (15.7-25.8) 23.4 (17.7-31.5) 26.1 (19.1-36.4) 30-day 4.84 (4.29-5.58) 6.92 (6.12-7.98) 9.75 (8.60-11.3) 12.1 (10.6-14.2) 15.5 (13.1-18.7) 18.2 (15.1-22.4) 21.1 (17.1-26.6) 24.2 (19.1-31.3) 28.5 (21.6-38.5) 32.0 (23.4-44.7) 45-day 5.76 (5.10-6.64) 8.14 (7.20-9.39) 11.4 (10.1-13.2) 14.2 (12.5-16.6) 18.3 (15.5-22.0) 21.5 (17.9-26.5) 25.0 (20.3-31.5) 28.8 (22.7-37.3) 34.2 (25.9-46.2) 38.7 (28.3-54.0) 60-day 6.77 (6.00-7.81) 9.44 (8.35-10.9) 13.1 (11.6-15.2) 16.3 (14.3-19.1) 21.0 (17.8-25.3) 24.8 (20.6-30.5) 28.9 (23.4-36.4) 33.3 (26.3-43.2) 39.8 (30.1-53.7) 45.2 (33.1-63.1) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.0703&... 1 of 4 2/24/2022, 8:55 AM Back to Top Maps & aerials Small scale terrain Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.0703&... 2 of 4 2/24/2022, 8:55 AM Large scale terrain Large scale map Large scale aerial + – 3km 2mi + – 100km 60mi + – 100km 60mi Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.0703&... 3 of 4 2/24/2022, 8:55 AM Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.0703&... 4 of 4 2/24/2022, 8:55 AM Proposed Condition LID BMP Performance Criteria for Design Capture Volume 1-hour rainfall depth (in) for a 2-year return period from http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=ca =0.541 s.f. acres s.f. acres % s.f. acres % DMA A 12,370 0.28 0 0.00 0.00% 12,370 0.28 100.00% 0.892 0.80 48-hrs 1,446 DMA B 62,335 1.43 5,539 0.13 8.89% 56,796 1.30 91.11% 0.747 0.80 48-hrs 6,099 DMA C 4,740 0.11 1,555 0.04 32.81% 3,185 0.07 67.19% 0.468 0.80 48-hrs 291 DMA D 12,492 0.29 754 0.02 6.04% 11,738 0.27 93.96% 0.790 0.80 48-hrs 1,294 Total 91,936 2.11 7,848 0.18 72,350 1.66 9,130 Note: See Form 4.2-1 LID BMP Performance Criteria for Design Capture Volume for more information. BMP Sizing Calculation Total Volume Provided 10,629 CF (DMA A = 1,598 CF, DMA B = 6,963 CF, DMA C = 470 CF & DMA D = 1,598 CF) Design Capture Vol. DCV (ft3) Drawdown Rate Mean 6-hr Precipitation P6 (in) DA# Runoff Coefficien t (Rc) Area Pervious Area Impervious Area 90.0" (2286 mm) 86.0" (2184 mm) INSTALLED 77.0" (1956 mm) 45.0" (1143 mm) 45.1" (1145 mm) 71.0" (1803 mm)26.5"(673 mm) 22.6" (574 mm) INSTALLED StormTech MC-3500 Chamber Designed to meet the most stringent industry performance standards for superior struc- tural integrity while providing designers with a cost-effective method to save valuable land and protect water resources. The StormTech system is designed primarily to be used under parking lots thus maximiz- ing land usage for commercial and municipal applications. MADE IN THE U.S.A. StormTech MC-3500 Chamber (not to scale) Nominal Chamber Specifications Size (L x W x H)90" (2286 mm) x 77" (1956 mm) x 45" (1143 mm) Chamber Storage 113.0 ft3 (3.20 m3) Min. Installed Storage*176.8 ft3 (5.01 m3) Weight 124 lbs (56.2 kg) Shipping 15 chambers/pallet 16 end caps/pallet 7 pallets/truck StormTech MC-3500 End Cap (not to scale) Nominal End Cap Specifications Size (L x W x H)26.5" (673 mm) x 71" (1803 mm) x 45.1" (1145 mm) End Cap Storage 15.6 ft3 (0.44 m3) Min. Installed Storage*45.6 ft3 (1.29 m3) Weight 43 lbs (19.5 kg) * This assumes a minimum of 12" (305 mm) of stone above, 9" (229 mm) of stone below chambers, 6” (152 mm) of stone between chambers/end caps and 40% stone porosity. *This assumes a minimum of 12" (305 mm) of stone above, 9" (229 mm) of stone below, 6" (152 mm) of stone perimeter, 6” (152 mm) of stone between chambers/end caps and 40% stone porosity. MC-3500 Chamber Stormtech MC-3500 Cut Sheet:Layout 1 11/6/09 1:38 PM Page 1 Printed on recycled paperPrinted in U.S.A. © Copyright. All rights reserved. StormTech LLC, 2009 S150909 20 Beaver Road, Suite 104 Wethersfield Connecticut 06109 860.529.8188 888.892.2694 fax 866.328.8401 fax 860-529-8040 www.stormtech.com NOTE: Assumes 40% porosity for the stone plus the chamber/end cap volume. End Cap volume assumes 6" (152 mm) stone perimeter. Storage Volume Per Chamber/End Cap ft3 (m3) Bare Chamber/End Cap and Stone Unit Volume — Stone Foundation Storage Depth in. (mm) ft3 (m3)9 (229)12 (305)15 (381)18 (457) MC-3500 Chamber 113.0 (3.20)176.8 (5.01)181.8 (5.15)186.8 (5.29)191.7 (5.43) MC-3500 End Cap 15.6 (0.44)45.6 (1.29)47.3 (1.34)48.9 (1.39)50.6 (1.43) Amount of Stone Per Chamber NOTE: Assumes 12" (305 mm) of stone above, and 6" (152 mm) between chambers. ENGLISH Stone Foundation Depth tons (yd3)9"12"15" 18" MC-3500 8.4 (5.9 yd3)9.0 (6.4 yd3)9.7 (6.8 yd3)10.3 (7.3 yd3) End Cap 3.9 (2.8 yd3)4.2 (2.9 yd3)4.4 (3.1 yd3)4.6 (3.2 yd3) METRICkg (m3)229 mm 305 mm 381 mm 457 mm MC-3500 7620 (4.5 m3)8164 (4.9 m3)8800 (5.2 m3)9344 (5.6 m3) End Cap 3538 (2.1 m3)3810 (2.2 m3)3992 (2.4 m3)4173 (2.4 m3) Volume of Excavation Per Chamber/End Cap in yd3 (m3) NOTE:Assumes 6" (152 mm) of separation between chamber rows and 24" (610 mm) of cover. The volume of excavation will vary as the depth of cover increases. Stone Foundation Depth 9" (229 mm)12" (305 mm)15" (381 mm) 18" (457 mm) MC-3500 11.9 (9.1)12.4 (9.5)12.9 (9.9)13.3 (10.2) End Cap 4.0 (3.1)4.1 (3.1)4.3 (3.3)4.4 (3.4) General Cross Section MADE IN THE U.S.A. Stormtech MC-3500 Cut Sheet:Layout 1 11/6/09 1:38 PM Page 2 Water Quality Management Plan (WQMP) Appendix C-1 Appendix C Education Materials After the Storm A Citizen’s Guide to Understanding Stormwater WHEN IT RAINS IT DRAINS What is stormwater runoff? Why is stormwater runoff a problem? The effects of pollution Stormwater runoff occurs when precipitation from rain or snowmelt flows over the ground. Impervious surfaces like driveways, sidewalks, and streets prevent stormwater from naturally soaking into the ground. Stormwater can pick up debris, chemicals, dirt, and other pollutants and flow into a storm sewer system or directly to a lake, stream, river, wetland, or coastal water. Anything that enters a storm sewer system is discharged untreated into the waterbodies we use for swimming, fishing, and providing drinking water. Polluted stormwater runoff can have many adverse effects on plants, fish, animals, and people. Sediment can cloud the water and make it difficult or impossible for aquatic plants to grow. Sediment also can . � destroy aquatic habitats Excess nutrients can cause algae blooms. When algae die, they sink to the bottom and decompose in a process that removes oxygen from the water. Fish and other aquatic organisms can’t exist in water with low dissolved oxygen levels. Bacteria and other pathogens can wash into swimming areas and create health hazards, often making beach closures necessary. Debris—plastic bags, six-pack rings, bottles, and cigarette butts—washed into waterbodies can choke, suffocate, or disable aquatic life like ducks, fish, turtles, and birds. Household hazardous wastes like insecticides, pesticides, paint, solvents, used motor oil, and other auto fluids can poison aquatic life. Land animals and people can become sick or die from eating diseased fish and shellfish or ingesting polluted water. Polluted stormwater often affects drinking water sources. This, in turn, can affect human health and increase drinking water treatment costs. � � � � � Auto care Washing your car and degreasing auto parts at home can send detergents and other contaminants through the storm sewer system. Dumping automotive fluids into storm drains has the same result as dumping the materials directly into a waterbody. Pet waste Pet waste can be a major source of bacteria and excess nutrients in local waters. � When walking your pet, remember to pick up the waste and dispose of it properly. Flushing pet waste is the best disposal method. Leaving pet waste on the ground increases public health risks by allowing harmful bacteria and nutrients to wash into the storm drain and eventually into local waterbodies. Septic systems Leaking and poorly maintained septic systems release nutrients and pathogens (bacteria and viruses) that can be picked up by stormwater and discharged into nearby waterbodies. Pathogens can cause public health problems and environmental concerns. Lawn care Excess fertilizers and pesticides applied to lawns and gardens wash off and pollute streams. In addition, yard clippings and leaves can wash into storm drains and contribute nutrients and organic matter to streams. Education is essential to changing people's behavior. Signs and markers near storm drains warn residents that pollutants entering the drains will be carried untreated into a local waterbody.Recycle or properly dispose of household products that contain chemicals, such as insecticides, pesticides, paint, solvents, and used motor oil and other auto fluids. Don’t pour them onto the ground or into storm drains. � � Use a commercial car wash that treats or recycles its wastewater, or wash your car on your yard so the water infiltrates into the ground. Repair leaks and dispose of used auto fluids and batteries at designated drop-off or recycling locations. � � � � Don’t overwater your lawn. Consider using a soaker hose instead of a sprinkler. Use pesticides and fertilizers sparingly. When use is necessary, use these chemicals in the recommended amounts. Use organic mulch or safer pest control methods whenever possible. Compost or mulch yard waste. Don’t leave it in the street or sweep it into storm drains or streams. Cover piles of dirt or mulch being used in landscaping projects. � � Inspect your system every 3 years and pump your tank as necessary (every 3 to 5 years). Don't dispose of household hazardous waste in sinks or toilets. Permeable Pavement Rain Barrels Rain Gardens and Grassy Swales Vegetated Filter Strips —Traditional concrete and asphalt don’t allow water to soak into the ground. Instead these surfaces rely on storm drains to divert unwanted water. Permeable pavement systems allow rain and snowmelt to soak through, decreasing stormwater runoff. —You can collect rainwater from rooftops in mosquito- proof containers. The water can be used later on lawn or garden areas. —Specially designed areas planted with native plants can provide natural places for rainwater to collect and soak into the ground. Rain from rooftop areas or paved areas can be diverted into these areas rather than into storm drains. —Filter strips are areas of native grass or plants created along roadways or streams. They trap the pollutants stormwater picks up as it flows across driveways and streets. Residential landscaping Stormwater Pollution Solutions Dirt, oil, and debris that collect in parking lots and paved areas can be washed into the storm sewer system and eventually enter local waterbodies. � � � Sweep up litter and debris from sidewalks, driveways and parking lots, especially around storm drains. Cover grease storage and dumpsters and keep them clean to avoid leaks. Report any chemical spill to the local hazardous waste cleanup team. They’ll know the best way to keep spills from harming the environment. Erosion controls that aren’t maintained can cause excessive amounts of sediment and debris to be carried into the stormwater system. Construction vehicles can leak fuel, oil, and other harmful fluids that can be picked up by stormwater and deposited into local waterbodies. � � � Divert stormwater away from disturbed or exposed areas of the construction site. Install silt fences, vehicle mud removal areas, vegetative cover, and other sediment and erosion controls especially after rainstorms. Prevent soil erosion by minimizing disturbed areas during construction projects, and seed and mulch bare areas as soon as possible. Uncovered fueling stations allow spills to be washed into storm drains. Cars waiting to be repaired can leak fuel, oil, and other harmful fluids that can be picked up by stormwater. � � � � Clean up spills immediately and properly dispose of cleanup materials. Provide cover over fueling stations and design or retrofit facilities for spill containment. Properly maintain fleet vehicles to prevent oil, gas, and other discharges from being washed into local waterbodies. Install and maintain oil/water separators. Lack of vegetation on streambanks can lead to erosion. Overgrazed pastures can also contribute excessive amounts of sediment to local waterbodies. Excess fertilizers and pesticides can poison aquatic animals and lead to destructive algae blooms. Livestock in streams can contaminate waterways with bacteria, making them unsafe for human contact. � � � � � Keep livestock away from streambanks and provide them a water source away from waterbodies. Store and apply manure away from waterbodies and in accordance with a nutrient management plan. Vegetate riparian areas along waterways. Rotate animal grazing to prevent soil erosion in fields. Apply fertilizers and pesticides according to label instructions to save money and minimize pollution. Improperly managed logging operations can result in erosion and sedimentation. � � � � � Conduct preharvest planning to prevent erosion and lower costs. Use logging methods and equipment that minimize soil disturbance. Plan and design skid trails, yard areas, and truck access roads to minimize stream crossings and avoid disturbing the forest floor. Construct stream crossings so that they minimize erosion and physical changes to streams. Expedite revegetation of cleared areas. Commercial Construction Agriculture Automotive Facilities Forestry and properly maintain them, WHEN IT RAINS IT DRAINS EPA 833-B-03-002 January 2003 For more information contact: or visit www.epa.gov/npdes/stormwater www.epa.gov/nps Internet Address (URL) HTTP://www.epa.gov Recycled/Recyclable Printed With Vegetable Oil Based Inks on 100% Postconsumer, ● ● Process Chlorine Free Recycled Paper The Ocean Begins at Your Front Door Follow these simple steps to help reduce water pollution: Household Activities Do not rinse spills with water Use dry cleanup methods such as applying cat litter or another absorbent material, sweep and dispose of in the trash Take items such as used or excess batteries, oven cleaners, automotive fluids, painting products and cathode ray tubes, like TVs and computer monitors, to a Household Hazardous Waste Collection Center (HHWCC) For a HHWCC near you call (714) 834-6752 or visit www oclandfills com Do not hose down your driveway, sidewalk or patio to the street, gutter or storm drain Sweep up debris and dispose of it in the trash Automotive Take your vehicle to a commercial car wash whenever possible If you wash your vehicle at home, choose soaps, cleaners, or detergents labeled non-toxic, phosphate- free or biodegradable Vegetable and citrus-based products are typically safest for the environment Do not allow washwater from vehicle washing to drain into the street, gutter or storm drain Excess washwater should be disposed of in the sanitary sewer (through a sink or toilet) or onto an absorbent surface like your lawn Monitor your vehicles for leaks and place a pan under leaks Keep your vehicles well maintained to stop and prevent leaks Never pour oil or antifreeze in the street, gutter or storm drain Recycle these substances at a service station, a waste oil collection center or used oil recycling center For the nearest Used Oil Collection Center call 1-800-CLEANUP or visit www 1800cleanup org Lawn and Garden Pet and animal waste Pesticides Clippings, leaves and soil Fertilizer Common Pollutants Automobile Oil and grease Radiator fluids and antifreeze Cleaning chemicals Brake pad dust Home Maintenance Detergents, cleaners and solvents Oil and latex paint Swimming pool chemicals Outdoor trash and litter Trash Place trash and litter that cannot be recycled in securely covered trash cans Whenever possible, buy recycled products Remember: Reduce, Reuse, Recycle Pet Care Always pick up after your pet Flush waste down the toilet or dispose of it in the trash Pet waste, if left outdoors, can wash into the street, gutter or storm drain If possible, bathe your pets indoors If you must bathe your pet outside, wash it on your lawn or another absorbent/permeable surface to keep the washwater from entering the street, gutter or storm drain Follow directions for use of pet care products and dispose of any unused products at a HHWCC Pool Maintenance Pool and spa water must be dechlorinated and free of excess acid, alkali or color to be allowed in the street, gutter or storm drain When it is not raining, drain dechlorinated pool and spa water directly into the sanitary sewer Some cities may have ordinances that do not allow pool water to be disposed of in the storm drain Check with your city Landscape and Gardening Do not over-water Water your lawn and garden by hand to control the amount of water you use or set irrigation systems to reflect seasonal water needs If water flows off your yard onto your driveway or sidewalk, your system is over-watering Periodically inspect and fix leaks and misdirected sprinklers Do not rake or blow leaves, clippings or pruning waste into the street, gutter or storm drain Instead, dispose of waste by composting, hauling it to a permitted landfill, or as green waste through your city’s recycling program Follow directions on pesticides and fertilizer, (measure, do not estimate amounts) and do not use if rain is predicted within 48 hours Take unwanted pesticides to a HHWCC to be recycled For locations and hours of HHWCC, call (714) 834-6752 or visit www oclandfills com Never allow pollutants to enter the street, gutter or storm drain! The Ocean Begins at Your Front Door Did You Know? Most people believe that the largest source of water pollution in urban areas comes from specific sources such as factories and sewage treatment plants In fact, the largest source of water pollution comes from city streets, neighborhoods, construction sites and parking lots This type of pollution is sometimes called “non-point source” pollution There are two types of non-point source pollution: stormwater and urban runoff pollution Stormwater runoff results from rainfall When rainstorms cause large volumes of water to rinse the urban landscape, picking up pollutants along the way Urban runoff can happen any time of the year when excessive water use from irrigation, vehicle washing and other sources carries trash, lawn clippings and other urban pollutants into storm drains Where Does It Go? Anything we use outside homes, vehicles and businesses – like motor oil, paint, pesticides, fertilizers and cleaners – can be blown or washed into storm drains A little water from a garden hose or rain can also send materials into storm drains Storm drains are separate from our sanitary sewer systems; unlike water in sanitary sewers (from sinks or toilets), water in storm drains is not treated before entering our waterways Sources of Non-Point Source Pollution Automotive leaks and spills Improper disposal of used oil and other engine fluids Metals found in vehicle exhaust, weathered paint, rust, metal plating and tires Pesticides and fertilizers from lawns, gardens and farms Improper disposal of cleaners, paint and paint removers Soil erosion and dust debris from landscape and construction activities Litter, lawn clippings, animal waste, and other organic matter Oil stains on parking lots and paved surfaces The Effect on the Ocean Non-point source pollution can have a serious impact on water quality in Orange County Pollutants from the storm drain system can harm marine life as well as coastal and wetland habitats They can also degrade recreation areas such as beaches, harbors and bays Stormwater quality management programs have been developed throughout Orange County to educate and encourage the public to protect water quality, monitor runoff in the storm drain system, investigate illegal dumping and maintain storm drains Support from Orange County residents and businesses is needed to improve water quality and reduce urban runoff pollution Proper use and disposal of materials will help stop pollution before it reaches the storm drain and the ocean For More Information Aliso Viejo (949) 425-2535 Anaheim Public Works Operations (714) 765-6860 Brea Engineering (714) 990-7666 Buena Park Public Works (714) 562-3655 Costa Mesa Public Services (714) 754-5323 Cypress Public Works (714) 229-6740 Dana Point Public Works (949) 248-3584 Fountain Valley Public Works (714) 593-4441 Fullerton Engineering Dept (714) 738-6853 Garden Grove Public Works (714) 741-5956 Huntington Beach Public Works (714) 536-5431 Irvine Public Works (949) 724-6315 La Habra Public Services (562) 905-9792 La Palma Public Works (714) 690-3310 Laguna Beach Water Quality (949) 497-0378 Laguna Hills Public Services (949) 707-2650 Laguna Niguel Public Works (949) 362-4337 Laguna Woods Public Works (949) 639-0500 Lake Forest Public Works (949) 461-3480 Los Alamitos Community Dev (562) 431-3538 Mission Viejo Public Works (949) 470-3056 Newport Beach, Code & Water Quality Enforcement (949) 644-3215 Orange Public Works (714) 532-6480 Placentia Public Works (714) 993-8245 Rancho Santa Margarita (949) 635-1800 San Clemente Environmental Programs (949) 361-6143 San Juan Capistrano Engineering (949) 234-4413 Santa Ana Public Works (714) 647-3380 Seal Beach Engineering (562) 431-2527 x317 Stanton Public Works (714) 379-9222 x204 Tustin Public Works/Engineering (714) 573-3150 Villa Park Engineering (714) 998-1500 Westminster Public Works/Engineering (714) 898-3311 x446 Yorba Linda Engineering (714) 961-7138 Orange County Stormwater Program (877) 897-7455 Orange County 24-Hour Water Pollution Problem Reporting Hotline 1-877-89-SPILL (1-877-897-7455) On-line Water Pollution Problem Reporting Form w w w o c w a t e r s h e d s c o m California Environmental Protection Agency www calepa ca gov • Air Resources Board www arb ca gov • Department of Pesticide Regulation www cdpr ca gov • Department of Toxic Substances Control www dtsc ca gov • Integrated Waste Management Board www ciwmb ca gov • Office of Environmental Health Hazard Assessment www oehha ca gov • State Water Resources Control Board www waterboards ca gov Earth 911 - Community-Specific Environmental Information 1-800-cleanup or visit www 1800cleanup org Health Care Agency’s Ocean and Bay Water Closure and Posting Hotline (714) 433-6400 or visit www ocbeachinfo com Integrated Waste Management Dept. of Orange County (714) 834-6752 or visit www oclandfills com for information on household hazardous waste collection centers, recycling centers and solid waste collection O.C. Agriculture Commissioner (714) 447-7100 or visit www ocagcomm com Stormwater Best Management Practice Handbook Visit www cabmphandbooks com UC Master Gardener Hotline (714) 708-1646 or visit www uccemg com Printed on Recycled Paper The Orange County Stormwater Program has created and moderates an electronic mailing list to facilitate communications, take questions and exchange ideas among its users about issues and topics related to stormwater and urban runoff and the implementation of program elements To join the list, please send an email to ocstormwaterinfo-join@list ocwatersheds com Orange County Stormwater Program For more information on what you and your community can do to use water more efficiently, contact: US. Environmental Protection Agency Office of Water 401 M Street, S.W. Washington, ILC. 20460 For more information on pollution prevention programs at U.S. €PA, contact: U.S. Environmental Protection Agency Office of Pollution Prevention 401 M Street, S.W. Washington, D.C. 20460 United States 2ow-0002 Environmental Protection July 1990 Agency OW (WH-556) OPPE (PM-222) ~ GEPA Preventing ~~ Through Efficient Water Use How Efficient Water Use Other Reasons to Use P7i-Y Water Wisely What Individuals What Communities Can Do ~~ ~ ~ What Communities Can Do ~ _. A water supplier or wastewater system operator (public or private) has cost-effective options to process and, deliver water more efficiently. A community can do the same, and can foster ways to use water wisely. Not all of these steps are expensive. The best choices vary by region and by community; start by asking if these are appropriate where you live and work. A Water Supplier or Wastewater Procsssqr Cgn: e Identify who uses water, and reduce unac- A Community Can: SF Adopt plumbing and building codes that require water-efficient equipment and practices. Adopt a water-efficient landscaping ordinance to reduce the water used for golf courses and com- mercial landscapes. Retrofit older buildings with water-efficient equipment, starting with public buildings, ' Reduce municipal water use for landscaping and other uses. Conduct a public education campaign. countedrfor water use. e Find and repair leaking pipes. e Consider a new pricing scheme which encour- ages conservation. Reduce excess pressure in water lines. Explore the reuse of treated wastewater for uses other than drinking water. e Charge hookup fees which encourage more efficient water use in new buildings. Build water efficiency into future demand pro- jections, facility planning, and drought plan- ning. uw Require developers to build in water efficiency measures. ~ -~ r Reasons to Use What Individuals Can Do Preventing pollution is only one reason why using water efficiently makes sense. Here are a few more: Money Saved Less water use results in fewer pumping and treatment costs. Saving money on water and wastewater opera- tions frees money for meeting water quality, public health and water treatment goals. Water saved is also energy, and money, saved for you and your community. Improved Reliability Water conservation provides a hedge against drought impacts. Improving water efficiency may be quicker and cheaper than developing a new supply. Reduced water use may extend the life of your water or wastewater facility. Reduced water use may increase the efficiency of wastewater treatment, and reduce overflows during storms. Communities which use water efficiently are better prepared to cope with effects of possible future climate change. More efficient water use begins with individuals, in the home and place of work. Taking these and other steps, and encouraging others to do so, makes good economic as well as environmental sense. In The Home 03~ Install a toilet dam or plastic 'bottle in your toilet tank. Install a water-efficient showerhead (2.5 gallons or less per minute). = When you buy a new toilet, purchase a low flow model (1.6 gallons or less per flush). Outdoors = Water in the morning or evening, to minimize = Install a drip-irrigation watering system for w- Use drought-tolerant plants and grasses for land- At Work or School ~ evaporation. valuable plant?. scaping, and reduce grass-covered areas. Adopt the same water-saving habits that are effective at home. Ask about installing wqter-efficient equipment and reducing outdoor water use. recycled "gray-water" or reclaimed wastewater. 03~ Encourage employers to explore the use of ~ How Efficient Water Use Helps Prevent Pollution ~ __ - Using water more efficiently can help prevent pollution as well as protect and conserve our finite water resources. More efficient water use by you and your community has many other benefits. Fewer Pollutants Protection of Drinking Water Sources Using less water reduces the amount of waste- water discharged into our lakes, streams, rivers, and marine waters. well. as Less pumping of groundwater lowers the chance that pollutants will be drawn into a water supply ES The amount of pollutants wastewater carries can With less water use, septic system performance can improve, reducing the risk of groundwater contamination. Highest quality water sources are preserved for drinking water by using treated wastewater for other uses. also be reduced, as treatment efficiency improves. Recycled process water can reduce pollutants from industry. More efficient irrigation can minimize runoff of agricultural pollutants and reduce the use of fertilizers and pesticides. Energy Conservation Protection of Aquatic Habitats Efficient water use means less power needed to pump and treat water and wastewater. Building fewer and smaller new water projects can help preserve wetlands, which naturally treat pollutants. US Less water use reduces the amount of energy required for heating hot water. = Diverting less water preserves more streamflow to maintain a healthy aquatic environment. Less energy demand results in fewer harmful by- products from power plants. For more information, please call the Orange County Stormwater Program at 1-877-89-SPILL (1-877-897-7455) or visit www.ocwatersheds.com To report a spill, call the Orange County 24-Hour Water Pollution Problem Reporting Hotline at 1-877-89-SPILL (1-877-897-7455). For emergencies, dial 911. Proper Maintenance Practices for Your Business The Ocean Beginsat Your Front Door PROJECT PREVENTION Help Prevent Ocean Pollution: Preventing water pollution at your commercial/industrial site Clean beaches and healthy creeks, rivers, bays and ocean are important to Orange County. However, many landscape and building maintenance activities can lead to water pollution if you’re not careful. Paint, chemicals, plant clippings and other materials can be blown or washed into storm drains that flow to the ocean. Unlike water in sanitary sewers (from sinks and toilets), water in storm drains is not treated before entering our waterways. You would never pour soap or fertilizers into the ocean, so why would you let them enter the storm drains? Follow these easy tips to help prevent water pollution. Some types of industrial facilities are required to obtain coverage under the State General Industrial Permit. For more information visit: www.swrcb.ca.gov/stormwater/industrial.html Printed on Recycled Paper Tips for Pool Maintenance Call your trash hauler to replace leaking dumpsters. Do not dump any toxic substance or liquid waste on the pavement, the ground, or near a storm drain. Even materials that seem harmless such as latex paint or biodegradable cleaners can damage the environment. Recycle paints, solvents and other materials. For more information about recycling and collection centers, visit www.oclandfills.com. Store materials indoors or under cover and away from storm drains. Use a construction and demolition recycling company to recycle lumber, paper, cardboard, metals, masonry, carpet, plastic, pipes, drywall, rocks, dirt, and green waste. For a listing of construction and demolition recycling locations in your area, visit www.ciwmb.ca.gov/recycle. Properly label materials. Familiarize employees with Material Safety Data Sheets. Landscape Maintenance Compost grass clippings, leaves, sticks and other vegetation, or dispose of it at a permitted landfill or in green waste containers. Do not dispose of these materials in the street, gutter or storm drain. Irrigate slowly and inspect the system for leaks, overspraying and runoff. Adjust automatic timers to avoid overwatering. Follow label directions for the use and disposal of fertilizers and pesticides. Do not apply pesticides or fertilizers if rain is expected within 48 hours or if wind speeds are above 5 mph. Do not spray pesticides within 100 feet of waterways. Fertilizers should be worked into the soil rather than dumped onto the surface. If fertilizer is spilled on the pavement or sidewalk, sweep it up immediately and place it back in the container. Building Maintenance Never allow washwater, sweepings or sediment to enter the storm drain. Sweep up dry spills and use cat litter, towels or similar materials to absorb wet spills. Dispose of it in the trash. If you wash your building, sidewalk or parking lot, you must contain the water. Use a shop vac to collect the water and contact your city or sanitation agency for proper disposal information. Do not let water enter the street, gutter or storm drain. Use drop cloths underneath outdoor painting, scraping, and sandblasting work, and properly dispose of materials in the trash. Use a ground cloth or oversized tub for mixing paint and cleaning tools. Use a damp mop or broom to clean floors. Cover dumpsters to keep insects, animals, rainwater and sand from entering. Keep the area around the dumpster clear of trash and debris. Do not overfill the dumpster. PROJECT PREVENTION Proper Maintenance Practices for your Business Never Dispose of Anything in the Storm Drain. and snowmelt remains above the surface, where it runs off rapidly in unnaturally large amounts. Storm sewer systems concentrate runoff into smooth, straight conduits. This runoff gathers speed and erosional power as it travels underground. When this runoff leaves the storm drains and empties into a stream, its excessive volume and power blast out streambanks, damaging streamside vegetation and wiping out aquatic habitat. These increased storm flows carry sediment loads from construction sites and other denuded surfaces and eroded streambanks. They often carry higher water temperatures from streets, roof tops, and parking lots, which are harmful to the health and reproduction of aquatic life. from Did you know that because of impervious surfaces like pave- ment and rooftops, a typical city block generates more than 5 times more runoff than a woodland area of the same size? The most recent National Water Quality Inventory reports that runoff from urbanized areas is the leading source of water quality impairments to surveyed estuaries and the third-largest source of impairments to surveyed lakes. In urban and suburban areas, much of the land surface is covered by buildings and pavement, which do not allow rain and snowmelt to soak into the ground. Instead, most developed areas rely on storm drains to carry large amounts of runoff from roofs and paved areas to nearby waterways. The stormwater runoff carries pollutants such as oil, dirt, chemicals, and lawn fertilizers directly to streams and rivers, where they seriously harm water quality. To protect surface water quality and groundwater resources, development should be designed and built to minimize increases in runoff. How Urbanized Areas Affect Water Quality Increased Runoff The porous and varied terrain of natural landscapes like forests, wetlands, and grasslands traps rainwater and snowmelt and allows them to filter slowly into the ground. In contrast, impervious (nonporous) surfaces like roads, parking lots, and rooftops prevent rain and snowmelt from infiltrating, or soaking, into the ground. Most of the rainfall The loss of infiltration from urbanization may also cause profound groundwater changes. Although urbanization leads to great increases in flooding during and immediately after wet weather, in many instances it results in lower stream flows during dry weather. Many native fish and other aquatic life cannot survive when these conditions prevail. Increased Pollutant Loads Urbanization increases the variety and amount of pollutants carried into streams, rivers, and lakes. The pollutants include: • Sediment • Oil, grease, and toxic chemicals from motor vehicles • Pesticides and nutrients from lawns and gardens • Viruses, bacteria, and nutrients from pet waste and failing septic systems • Road salts • Heavy metals from roof shingles, motor vehicles, and other sources • Thermal pollution from dark impervious surfaces such as streets and rooftops These pollutants can harm fish and wildlife populations, kill native vegetation, foul drinking water supplies, and make recreational areas unsafe and unpleasant. Clean Water Is Everybody’s Business URBAN RUNOFFEPA 841-F-03-003 Relationship between impervious cover and surface runoff. Impervious cover in a watershed results in increased surface ruunoff. As little as 10 percent impervious cover in a watershed can result in stream degradation. Protecting Water Quality Managing Urban Runoff What Homeowners Can Do To decrease polluted runoff from paved surfaces, households can develop alternatives to areas traditionally covered by impervious surfaces. Porous pavement materials are available for driveways and sidewalks, and native vegetation and mulch can replace high maintenance grass lawns. Homeowners can use fertilizers sparingly and sweep driveways, sidewalks, and roads instead of using a hose. Instead of disposing of yard waste, they can use the materials to start a compost pile. And homeowners can learn to use Integrated Pest Management (IPM) to reduce dependence on harmful pesticides. In addition, households can prevent polluted runoff by picking up after pets and using, storing, and disposing of chemicals properly. Drivers should check their cars for leaks and recycle their motor oil and antifreeze when these fluids are changed. Drivers can also avoid impacts from car wash runoff (e.g., detergents, grime, etc.) by using car wash facilities that do not generate runoff. Households served by septic systems should have them professionally inspected For More Information U.S. Environmental Protection Agency Nonpoint Source Control Branch (4503T) 1200 Pennsylvania Avenue, NW Washington, DC 20460 www.epa.gov/nps and pumped every 3 to 5 years. They should also practice water conservation measures to extend the life of their septic systems. Controlling Impacts from New Development Developers and city planners should attempt to control the volume of runoff from new development by using low impact development, structural controls, and pollution prevention strategies. Low impact development includes measures that conserve natural areas (particularly sensitive hydrologic areas like riparian buffers and infiltrable soils); reduce development impacts; and reduce site runoff rates by maximizing surface roughness, infiltration opportunities, and flow paths. Controlling Impacts from Existing Development Controlling runoff from existing urban areas is often more costly than controlling runoff from new developments. Economic efficiencies are often realized through approaches that target “hot spots” of runoff pollution or have multiple benefits, such as high-efficiency street sweeping (which addresses aesthetics, road safety, and water quality). Urban planners and others responsible for managing urban and suburban areas can first identify and implement pollution prevention strategies and examine source control opportunities. They should seek out priority pollutant reduction opportunities, then protect natural areas that help control runoff, and finally begin ecological restoration and retrofit activities to clean up degraded water bodies. Local governments are encouraged to take lead roles in public education efforts through public signage, storm drain marking, pollution prevention outreach campaigns, and partnerships with citizen groups and businesses. Citizens can help prioritize the clean-up strategies, volunteer to become involved in restoration efforts, and mark storm drains with approved “don’t dump” messages. Turn Your Home into a Stormwater Pollution Solution! www.epa.gov/nps This web site links to an EPA homeowner’s guide to healthy habits for clean water that provides tips for better vehicle and garage care, lawn and garden techniques, home improvement, pet care, and more. National Management Measures to Control Nonpoint Source Pollution from Urban Areas www.epa.gov/owow/nps/urbanmm This technical guidance and reference document is useful to local, state, and tribal managers in implementing management programs for polluted runoff. Contains information on the best available, economically achievable means of reducing pollution of surface waters and groundwater from urban areas. Onsite Wastewater Treatment System Resources www.epa.gov/owm/onsite This web site contains the latest brochures and other resources from EPA for managing onsite wastewater treatment systems (OWTS) such as conventional septic systems and alternative decentralized systems. These resources provide basic information to help individual homeowners, as well as detailed, up-to-date technical guidance of interest to local and state health departments. Low Impact Development Center www.lowimpactdevelopment.org This center provides information on protecting the environment and water resources through integrated site design techniques that are intended to replicate preexisting hydrologic site conditions. Stormwater Manager’s Resource Center (SMRC) www.stormwatercenter.net Created and maintained by the Center for Watershed Protection, this resource center is designed specifically for stormwater practitioners, local government officials, and others that need technical assistance on stormwater management issues. Strategies: Community Responses to Runoff Pollution www.nrdc.org/water/pollution/storm/stoinx.asp The Natural Resources Defense Council developed this inter- active web document to explore some of the most effective strategies that communities are using around the nation to control urban runoff pollution. The document is also available in print form and as an interactive CD-ROM. Fe b r u a r y 2 0 0 3 Related Publications For more information, please call the Orange County Stormwater Program at 1-877-89-SPILL (1-877-897-7455) or visit www.ocwatersheds.com UCCE Master Gardener Hotline: (714) 708-1646 To report a spill, call the Orange County 24-Hour Water Pollution Problem Reporting Hotline 1-877-89-SPILL (1-877-897-7455). For emergencies, dial 911. The tips contained in this brochure provide useful information to help prevent water pollution while landscaping or gardening. If you have other suggestions, please contact your city’s stormwater representatives or call the Orange County Stormwater Program. C lean beaches and healthy creeks, rivers, bays and ocean are important to Orange County. However, many common activities can lead to water pollution if you’re not careful. Fertilizers, pesticides and other chemicals that are left on yards or driveways can be blown or washed into storm drains that flow to the ocean. Overwatering lawns can also send materials into storm drains. Unlike water in sanitary sewers (from sinks and toilets), water in storm drains is not treated before entering our waterways. You would never pour gardening products into the ocean, so don’t let them enter the storm drains. Follow these easy tips to help prevent water pollution. Printed on Recycled Paper Tips for Landscape and GardeningTips for Landscape & Gardening Never allow gardening products or polluted water to enter the street, gutter or storm drain. General Landscaping Tips Protect stockpiles and materials from wind and rain by storing them under tarps or secured plastic sheeting. Prevent erosion of slopes by planting fast-growing, dense ground covering plants. These will shield and bind the soil. Plant native vegetation to reduce the amount of water, fertilizers, and pesticide applied to the landscape. Never apply pesticides or fertilizers when rain is predicted within the next 48 hours. Garden & Lawn Maintenance Do not overwater. Use irrigation practices such as drip irrigation, soaker hoses or micro spray systems. Periodically inspect and fix leaks and misdirected sprinklers. Do not rake or blow leaves, clippings or pruning waste into the street, gutter or storm drain. Instead, dispose of green waste by composting, hauling it to a permitted landfill, or recycling it through your city’s program. Use slow-release fertilizers to minimize leaching, and use organic fertilizers. Read labels and use only as directed. Do not over-apply pesticides or fertilizers. Apply to spots as needed, rather than blanketing an entire area. Store pesticides, fertilizers and other chemicals in a dry covered area to prevent exposure that may result in the deterioration of containers and packaging. Rinse empty pesticide containers and re-use rinse water as you would use the product. Do not dump rinse water down storm drains. Dispose of empty containers in the trash. When available, use non-toxic alternatives to traditional pesticides, and use pesticides specifically designed to control the pest you are targeting. For more information, visit www.ipm.ucdavis.edu. If fertilizer is spilled, sweep up the spill before irrigating. If the spill is liquid, apply an absorbent material such as cat litter, and then sweep it up and dispose of it in the trash. Take unwanted pesticides to a Household Hazardous Waste Collection Center to be recycled. Locations are provided below. Household Hazardous Waste Collection Centers Anaheim: 1071 N. Blue Gum St. Huntington Beach: 17121 Nichols St. Irvine: 6411 Oak Canyon San Juan Capistrano: 32250 La Pata Ave. For more information, call (714) 834-6752 or visit www.oclandfills.com Water Quality Management Plan (WQMP) Appendix C-2 Appendix D BMP Fact Sheets Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 1 of 10 Industrial and Commercial www.casqa.org Description Many activities that occur at an industrial or commercial site have the potential to cause accidental spills. Preparation for accidental spills, with proper training and reporting systems implemented, can minimize the discharge of pollutants to the environment. Spills and leaks are one of the largest contributors of stormwater pollutants. Spill prevention and control plans are applicable to any site at which hazardous materials are stored or used. An effective plan should have spill prevention and response procedures that identify hazardous material storage areas, specify material handling procedures, describe spill response procedures, and provide locations of spill clean-up equipment and materials. The plan should take steps to identify and characterize potential spills, eliminate and reduce spill potential, respond to spills when they occur in an effort to prevent pollutants from entering the stormwater drainage system, and train personnel to prevent and control future spills. An adequate supply of spill clean- up materials must be maintained onsite. Approach General Pollution Prevention Protocols  Develop procedures to prevent/mitigate spills to storm drain systems.  Develop and standardize reporting procedures, containment, storage, and disposal activities, documentation, and follow-up procedures.  Establish procedures and/or controls to minimize spills and leaks. The procedures should address:  Description of the facility, owner and address, activities, chemicals, and quantities present; Objectives  Cover  Contain  Educate  Reduce/Minimize  Product Substitution Targeted Constituents Sediment Nutrients Trash Metals  Bacteria Oil and Grease  Organics  Minimum BMPs Covered Good Housekeeping Preventative Maintenance Spill and Leak Prevention and Response  Material Handling & Waste Management Erosion and Sediment Controls Employee Training Program  Quality Assurance Record Keeping  Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 2 of 10 Industrial and Commercial www.casqa.org  Facility map of the locations of industrial materials;  Notification and evacuation procedures;  Cleanup instructions;  Identification of responsible departments; and  Identify key spill response personnel.  Recycle, reclaim, or reuse materials whenever possible. This will reduce the amount of process materials that are brought into the facility. Spill and Leak Prevention and Response Spill Prevention  Develop procedures to prevent/mitigate spills to storm drain systems. Develop and standardize reporting procedures, containment, storage, and disposal activities, documentation, and follow-up procedures.  If illegal dumping is observed at the facility:  Post “No Dumping” signs with a phone number for reporting illegal dumping and disposal. Signs should also indicate fines and penalties applicable for illegal dumping.  Landscaping and beautification efforts may also discourage illegal dumping.  Bright lighting and/or entrance barriers may also be needed to discourage illegal dumping.  Store and contain liquid materials in such a manner that if the container is ruptured, the contents will not discharge, flow, or be washed into the storm drainage system, surface waters, or groundwater.  If the liquid is oil, gas, or other material that separates from and floats on water, install a spill control device (such as a tee section) in the catch basins that collects runoff from the storage tank area. Preventative Maintenance  Place drip pans or absorbent materials beneath all mounted taps, and at all potential drip and spill locations during filling and unloading of tanks. Any collected liquids or soiled absorbent materials must be reused/recycled or properly disposed.  Store and maintain appropriate spill cleanup materials in a location known to all near the tank storage area; and ensure that employees are familiar with the site’s spill control plan and/or proper spill cleanup procedures. Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 3 of 10 Industrial and Commercial www.casqa.org  Sweep and clean the storage area monthly if it is paved, do not hose down the area to a storm drain.  Check tanks (and any containment sumps) daily for leaks and spills. Replace tanks that are leaking, corroded, or otherwise deteriorating with tanks in good condition. Collect all spilled liquids and properly dispose of them.  Label all containers according to their contents (e.g., solvent, gasoline).  Label hazardous substances regarding the potential hazard (corrosive, radioactive, flammable, explosive, poisonous).  Prominently display required labels on transported hazardous and toxic materials (per US DOT regulations).  Identify key spill response personnel. Spill Response  Clean up leaks and spills immediately.  Place a stockpile of spill cleanup materials where it will be readily accessible (e.g., near storage and maintenance areas).  On paved surfaces, clean up spills with as little water as possible.  Use a rag for small spills, a damp mop for general cleanup, and absorbent material for larger spills.  If the spilled material is hazardous, then the used cleanup materials are also hazardous and must be sent to a certified laundry (rags) or disposed of as hazardous waste.  If possible use physical methods for the cleanup of dry chemicals (e.g., brooms, shovels, sweepers, or vacuums).  Never hose down or bury dry material spills. Sweep up the material and dispose of properly.  Chemical cleanups of material can be achieved with the use of adsorbents, gels, and foams. Use adsorbent materials on small spills rather than hosing down the spill. Remove the adsorbent materials promptly and dispose of properly.  For larger spills, a private spill cleanup company or Hazmat team may be necessary. Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 4 of 10 Industrial and Commercial www.casqa.org Reporting  Report spills that pose an immediate threat to human health or the environment to the Regional Water Quality Control Board or local authority as location regulations dictate.  Federal regulations require that any oil spill into a water body or onto an adjoining shoreline be reported to the National Response Center (NRC) at 800-424-8802 (24 hour).  Report spills to 911 for dispatch and clean-up assistance when needed. Do not contact fire agencies directly.  Establish a system for tracking incidents. The system should be designed to identify the following:  Types and quantities (in some cases) of wastes;  Patterns in time of occurrence (time of day/night, month, or year);  Mode of dumping (abandoned containers, “midnight dumping” from moving vehicles, direct dumping of materials, accidents/spills);  Clean-up procedures; and  Responsible parties. Employee Training Program  Educate employees about spill prevention and cleanup.  Well-trained employees can reduce human errors that lead to accidental releases or spills:  The employee should have the tools and knowledge to immediately begin cleaning up a spill should one occur; and  Employees should be familiar with the Spill Prevention Control and Countermeasure Plan.  Employees should be educated about aboveground storage tank requirements. Employees responsible for aboveground storage tanks and liquid transfers should be thoroughly familiar with the Spill Prevention Control and Countermeasure Plan and the plan should be readily available.  Train employees to recognize and report illegal dumping incidents. Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 5 of 10 Industrial and Commercial www.casqa.org Other Considerations (Limitations and Regulations)  State regulations exist for facilities with a storage capacity of 10,000 gallons or more of petroleum to prepare a Spill Prevention Control and Countermeasure (SPCC) Plan (Health & Safety Code Chapter 6.67).  State regulations also exist for storage of hazardous materials (Health & Safety Code Chapter 6.95), including the preparation of area and business plans for emergency response to the releases or threatened releases.  Consider requiring smaller secondary containment areas (less than 200 sq. ft.) to be connected to the sanitary sewer, prohibiting any hard connections to the storm drain. Requirements Costs (including capital and operation & maintenance)  Will vary depending on the size of the facility and the necessary controls.  Prevention of leaks and spills is inexpensive. Treatment and/or disposal of contaminated soil or water can be quite expensive. Maintenance (including administrative and staffing)  Develop spill prevention and control plan, provide and document training, conduct inspections of material storage areas, and supply spill kits.  Extra time is needed to properly handle and dispose of spills, which results in increased labor costs. Supplemental Information Further Detail of the BMP Reporting Record keeping and internal reporting represent good operating practices because they can increase the efficiency of the facility and the effectiveness of BMPs. A good record keeping system helps the facility minimize incident recurrence, correctly respond with appropriate cleanup activities, and comply with legal requirements. A record keeping and reporting system should be set up for documenting spills, leaks, and other discharges, including discharges of hazardous substances in reportable quantities. Incident records describe the quality and quantity of non-stormwater discharges to the storm sewer. These records should contain the following information:  Date and time of the incident;  Weather conditions;  Duration of the spill/leak/discharge; Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 6 of 10 Industrial and Commercial www.casqa.org  Cause of the spill/leak/discharge;  Response procedures implemented;  Persons notified; and  Environmental problems associated with the spill/leak/discharge. Separate record keeping systems should be established to document housekeeping and preventive maintenance inspections, and training activities. All housekeeping and preventive maintenance inspections should be documented. Inspection documentation should contain the following information:  Date and time the inspection was performed;  Name of the inspector;  Items inspected;  Problems noted;  Corrective action required; and  Date corrective action was taken. Other means to document and record inspection results are field notes, timed and dated photographs, videotapes, and drawings and maps. Aboveground Tank Leak and Spill Control Accidental releases of materials from aboveground liquid storage tanks present the potential for contaminating stormwater with many different pollutants. Materials spilled, leaked, or lost from tanks may accumulate in soils or on impervious surfaces and be carried away by stormwater runoff. The most common causes of unintentional releases are:  Installation problems;  Failure of piping systems (pipes, pumps, flanges, couplings, hoses, and valves);  External corrosion and structural failure;  Spills and overfills due to operator error; and  Leaks during pumping of liquids or gases from truck or rail car to a storage tank or vice versa. Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 7 of 10 Industrial and Commercial www.casqa.org Storage of reactive, ignitable, or flammable liquids should comply with the Uniform Fire Code and the National Electric Code. Practices listed below should be employed to enhance the code requirements:  Tanks should be placed in a designated area.  Tanks located in areas where firearms are discharged should be encapsulated in concrete or the equivalent.  Designated areas should be impervious and paved with Portland cement concrete, free of cracks and gaps, in order to contain leaks and spills.  Liquid materials should be stored in UL approved double walled tanks or surrounded by a curb or dike to provide the volume to contain 10 percent of the volume of all of the containers or 110 percent of the volume of the largest container, whichever is greater. The area inside the curb should slope to a drain.  For used oil or dangerous waste, a dead-end sump should be installed in the drain.  All other liquids should be drained to the sanitary sewer if available. The drain must have a positive control such as a lock, valve, or plug to prevent release of contaminated liquids.  Accumulated stormwater in petroleum storage areas should be passed through an oil/water separator. Maintenance is critical to preventing leaks and spills. Conduct routine inspections and:  Check for external corrosion and structural failure.  Check for spills and overfills due to operator error.  Check for failure of piping system (pipes, pumps, flanges, coupling, hoses, and valves).  Check for leaks or spills during pumping of liquids or gases from truck or rail car to a storage facility or vice versa.  Visually inspect new tank or container installation for loose fittings, poor welding, and improper or poorly fitted gaskets.  Inspect tank foundations, connections, coatings, and tank walls and piping system. Look for corrosion, leaks, cracks, scratches, and other physical damage that may weaken the tank or container system.  Frequently relocate accumulated stormwater during the wet season. Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 8 of 10 Industrial and Commercial www.casqa.org  Periodically conduct integrity testing by a qualified professional. Vehicle Leak and Spill Control Major spills on roadways and other public areas are generally handled by highly trained Hazmat teams from local fire departments or environmental health departments. The measures listed below pertain to leaks and smaller spills at vehicle maintenance shops. In addition to implementing the spill prevention, control, and clean up practices above, use the following measures related to specific activities: Vehicle and Equipment Maintenance  Perform all vehicle fluid removal or changing inside or under cover to prevent the run-on of stormwater and the runoff of spills.  Regularly inspect vehicles and equipment for leaks, and repair immediately.  Check incoming vehicles and equipment (including delivery trucks, and employee and subcontractor vehicles) for leaking oil and fluids. Do not allow leaking vehicles or equipment onsite.  Always use secondary containment, such as a drain pan or drop cloth, to catch spills or leaks when removing or changing fluids.  Immediately drain all fluids from wrecked vehicles.  Store wrecked vehicles or damaged equipment under cover.  Place drip pans or absorbent materials under heavy equipment when not in use.  Use absorbent materials on small spills rather than hosing down the spill.  Remove the adsorbent materials promptly and dispose of properly.  Promptly transfer used fluids to the proper waste or recycling drums. Don’t leave full drip pans or other open containers lying around.  Oil filters disposed of in trashcans or dumpsters can leak oil and contaminate stormwater. Place the oil filter in a funnel over a waste oil recycling drum to drain excess oil before disposal. Oil filters can also be recycled. Ask your oil supplier or recycler about recycling oil filters.  Store cracked batteries in a non-leaking secondary container. Do this with all cracked batteries, even if you think all the acid has drained out. If you drop a battery, treat it as if it is cracked. Put it into the containment area until you are sure it is not leaking. Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 9 of 10 Industrial and Commercial www.casqa.org Vehicle and Equipment Fueling  Design the fueling area to prevent the run-on of stormwater and the runoff of spills: Cover fueling area if possible. Use a perimeter drain or slope pavement inward with drainage to a sump. Pave fueling area with concrete rather than asphalt.  If dead-end sump is not used to collect spills, install an oil/water separator.  Install vapor recovery nozzles to help control drips as well as air pollution.  Discourage “topping-off’ of fuel tanks.  Use secondary containment when transferring fuel from the tank truck to the fuel tank.  Use absorbent materials on small spills and general cleaning rather than hosing down the area. Remove the absorbent materials promptly.  Carry out all Federal and State requirements regarding underground storage tanks, or install above ground tanks.  Do not use mobile fueling of mobile industrial equipment around the facility; rather, transport the equipment to designated fueling areas.  Keep your Spill Prevention Control and Countermeasure (SPCC) Plan up-to-date.  Train employees in proper fueling and cleanup procedures. Industrial Spill Prevention Response For the purposes of developing a spill prevention and response program to meet the stormwater regulations, facility managers should use information provided in this fact sheet and the spill prevention/response portions of the fact sheets in this handbook, for specific activities. The program should:  Integrate with existing emergency response/hazardous materials programs (e.g., Fire Department).  Develop procedures to prevent/mitigate spills to storm drain systems.  Identify responsible departments. Spill Prevention, Control & Cleanup SC-11 September 2014 California Stormwater BMP Handbook 10 of 10 Industrial and Commercial www.casqa.org  Develop and standardize reporting procedures, containment, storage, and disposal activities, documentation, and follow-up procedures.  Address spills at municipal facilities, as well as public areas.  Provide training concerning spill prevention, response and cleanup to all appropriate personnel. References and Resources California’s Nonpoint Source Program Plan. http://www.swrcb.ca.gov/nps/index.html. Clark County Storm Water Pollution Control Manual. Available online at: http://www.co.clark.wa.us/pubworks/bmpman.pdf. King County Storm Water Pollution Control Manual. Available online at: http://dnr.metrokc.gov/wlr/dss/spcm.htm. Orange County Stormwater Program, Best Management Practices for Industrial/Commercial Business Activities. Available online at: http://ocwatersheds.com/documents/bmp/industrialcommercialbusinessesactivities Santa Clara Valley Urban Runoff Pollution Prevention Program. http://www.scvurppp.org. The Stormwater Managers Resource Center. http://www.stormwatercenter.net/. Waste Handling & Disposal SC-34 September 2014 California Stormwater BMP Handbook 1 of 6 Industrial and Commercial www.casqa.org Description Improper storage and handling of solid wastes can allow toxic compounds, oils and greases, heavy metals, nutrients, suspended solids, and other pollutants to enter stormwater runoff. The discharge of pollutants to stormwater from waste handling and disposal can be prevented and reduced by tracking waste generation, storage, and disposal; reducing waste generation and disposal through source reduction, reuse, and recycling; and preventing run-on and runoff. Approach Reduce potential for pollutant discharge through source control pollution prevention and BMP implementation. Successful implementation depends on effective training of employees on applicable BMPs and general pollution prevention strategies and objectives. General Pollution Prevention Protocols  Accomplish reduction in the amount of waste generated using the following source controls:  Production planning and sequencing;  Process or equipment modification;  Raw material substitution or elimination;  Loss prevention and housekeeping;  Waste segregation and separation; and  Close loop recycling.  Establish a material tracking system to increase awareness about material usage. This may reduce spills and minimize contamination, thus reducing the amount of waste produced.  Recycle materials whenever possible. Objectives  Cover  Contain  Educate  Reduce/Minimize  Product Substitution Targeted Constituents Sediment Nutrients Trash Metals  Bacteria  Oil and Grease  Organics  Minimum BMPs Covered Good Housekeeping  Preventative Maintenance  Spill and Leak Prevention and Response  Material Handling & Waste Management  Erosion and Sediment Controls  Employee Training Program  Quality Assurance Record Keeping   Waste Handling & Disposal SC-34 September 2014 California Stormwater BMP Handbook 2 of 6 Industrial and Commercial www.casqa.org  Use the entire product before disposing of the container.  To the extent possible, store wastes under cover or indoors after ensuring all safety concerns such as fire hazard and ventilation are addressed.  Provide containers for each waste stream at each work station. Allow time after shift to clean area. Good Housekeeping  Cover storage containers with leak proof lids or some other means. If waste is not in containers, cover all waste piles (plastic tarps are acceptable coverage) and prevent stormwater run-on and runoff with a berm. The waste containers or piles must be covered except when in use.  Use drip pans or absorbent materials whenever grease containers are emptied by vacuum trucks or other means. Grease cannot be left on the ground. Collected grease must be properly disposed of as garbage.  Dispose of rinse and wash water from cleaning waste containers into a sanitary sewer if allowed by the local sewer authority. Do not discharge wash water to the street or storm drain. Clean in a designated wash area that drains to a clarifier.  Transfer waste from damaged containers into safe containers.  Take special care when loading or unloading wastes to minimize losses. Loading systems can be used to minimize spills and fugitive emission losses such as dust or mist. Vacuum transfer systems can minimize waste loss.  Keep the waste management area clean at all times by sweeping and cleaning up spills immediately.  Use dry methods when possible (e.g., sweeping, use of absorbents) when cleaning around restaurant/food handling dumpster areas. If water must be used after sweeping/using absorbents, collect water and discharge through grease interceptor to the sewer.  Stencil or demarcate storm drains on the facility’s property with prohibitive message regarding waste disposal.  Cover waste piles with temporary covering material such as reinforced tarpaulin, polyethylene, polyurethane, polypropylene or hypalon.  If possible, move the activity indoor after ensuring all safety concerns such as fire hazard and ventilation are addressed. Preventative Maintenance  Prevent stormwater run-on from entering the waste management area by enclosing the area or building a berm around the area.  Prevent waste materials from directly contacting rain. Waste Handling & Disposal SC-34 September 2014 California Stormwater BMP Handbook 3 of 6 Industrial and Commercial www.casqa.org  Cover waste piles with temporary covering material such as reinforced tarpaulin, polyethylene, polyurethane, polypropylene or hypalon.  Cover the area with a permanent roof if feasible.  Cover dumpsters to prevent rain from washing waste out of holes or cracks in the bottom of the dumpster.  Check waste containers weekly for leaks and to ensure that lids are on tightly. Replace any that are leaking, corroded, or otherwise deteriorating.  Sweep and clean the waste management area regularly. Use dry methods when possible (e.g., sweeping, vacuuming, use of absorbents) when cleaning around restaurant/food handling dumpster areas. If water must be used after sweeping/using absorbents, collect water and discharge through grease interceptor to the sewer.  Inspect and replace faulty pumps or hoses regularly to minimize the potential of releases and spills.  Repair leaking equipment including valves, lines, seals, or pumps promptly. Spill Response and Prevention Procedures  Keep your spill prevention and plan up-to-date.  Have an emergency plan, equipment and trained personnel ready at all times to deal immediately with major spills.  Collect all spilled liquids and properly dispose of them.  Store and maintain appropriate spill cleanup materials in a location known to all near the designated wash area.  Ensure that vehicles transporting waste have spill prevention equipment that can prevent spills during transport. Spill prevention equipment includes:  Vehicles equipped with baffles for liquid waste; and  Trucks with sealed gates and spill guards for solid waste. Material Handling and Waste Management Litter Control  Post “No Littering” signs and enforce anti-litter laws.  Provide a sufficient number of litter receptacles for the facility.  Clean out and cover litter receptacles frequently to prevent spillage. Waste Collection  Keep waste collection areas clean. Waste Handling & Disposal SC-34 September 2014 California Stormwater BMP Handbook 4 of 6 Industrial and Commercial www.casqa.org  Inspect solid waste containers for structural damage regularly. Repair or replace damaged containers as necessary.  Secure solid waste containers; containers must be closed tightly when not in use.  Do not fill waste containers with washout water or any other liquid.  Ensure that only appropriate solid wastes are added to the solid waste container. Certain wastes such as hazardous wastes, appliances, fluorescent lamps, pesticides, etc., may not be disposed of in solid waste containers (see chemical/ hazardous waste collection section below).  Do not mix wastes; this can cause chemical reactions, make recycling impossible, and complicate disposal. Affix labels to all waste containers. Chemical/Hazardous Wastes  Select designated hazardous waste collection areas on-site.  Store hazardous materials and wastes in covered containers and protect them from vandalism.  Place hazardous waste containers in secondary containment.  Make sure that hazardous waste is collected, removed, and disposed of only at authorized disposal areas.  Hazardous waste cannot be reused or recycled; it must be disposed of by a licensed hazardous waste hauler. Employee Training Program  Educate employees about pollution prevention measures and goals.  Train employees how to properly handle and dispose of waste using the source control BMPs described above.  Train employees and subcontractors in proper hazardous waste management.  Use a training log or similar method to document training.  Ensure that employees are familiar with the site’s spill control plan and/or proper spill cleanup procedures. Quality Assurance and Record Keeping  Keep accurate maintenance logs that document minimum BMP activities performed for waste handling and disposal, types and quantities of waste disposed of, and any improvement actions.  Keep accurate logs of spill response actions that document what was spilled, how it was cleaned up, and how the waste was disposed. Waste Handling & Disposal SC-34 September 2014 California Stormwater BMP Handbook 5 of 6 Industrial and Commercial www.casqa.org  Establish procedures to complete logs and file them in the central office. Potential Capital Facility Costs and Operation & Maintenance Requirements Facilities  Capital costs will vary substantially depending on the size of the facility and the types of waste handled. Significant capital costs may be associated with reducing wastes by modifying processes or implementing closed-loop recycling.  Many facilities will already have indoor covered areas where waste materials will be stored and will require no additional capital expenditures for providing cover.  If outdoor storage of wastes is required, construction of berms or other means to prevent stormwater run-on and runoff may require appropriate constructed systems for containment.  Capital investments will likely be required at some sites if adequate cover and containment facilities do not exist and can vary significantly depending upon site conditions. Maintenance  Check waste containers weekly for leaks and to ensure that lids are on tightly. Replace any that are leaking, corroded, or otherwise deteriorating.  Sweep and clean the waste management area regularly. Use dry methods when possible (e.g., sweeping, use of absorbents) when cleaning around restaurant/food handling dumpster areas. If water must be used after sweeping/using absorbents, collect water and discharge through grease interceptor to the sewer.  Inspect and replace faulty pumps or hoses regularly to minimize the potential of releases and spills.  Repair leaking equipment including valves, lines, seals, or pumps promptly. References and Resources Minnesota Pollution Control Agency, Industrial Stormwater Best Management Practices Guidebook. Available online at: http://www.pca.state.mn.us/index.php/view- document.html?gid=10557. New Jersey Department of Environmental Protection, 2013. Basic Industrial Stormwater General Permit Guidance Document NJPDES General Permit No NJ0088315, Revised. Available online at: http://www.nj.gov/dep/dwq/pdf/5G2_guidance_color.pdf. Orange County Stormwater Program, Best Management Practices for Industrial/Commercial Business Activities. Available online at: http://ocwatersheds.com/documents/bmp/industrialcommercialbusinessesactivities Waste Handling & Disposal SC-34 September 2014 California Stormwater BMP Handbook 6 of 6 Industrial and Commercial www.casqa.org Oregon Department of Environmental Quality, 2013. Industrial Stormwater Best Management Practices Manual- BMP 26 Fueling and Liquid Loading/Unloading Operations. Available online at: http://www.deq.state.or.us/wq/wqpermit/docs/IndBMP021413.pdf. Sacramento Stormwater Management Program. Best Management Practices for Industrial Storm Water Pollution Control. Available online at: http://www.msa.saccounty.net/sactostormwater/documents/guides/industrial-BMP- manual.pdf. Sacramento County Environmental Management Stormwater Program: Best Management Practices. Available online at: http://www.emd.saccounty.net/EnvHealth/Stormwater/Stormwater-BMPs.html. Santa Clara Valley Urban Runoff Pollution Prevention Program. http://www.scvurppp- w2k.com/ US EPA. National Pollutant Discharge Elimination System – Industrial Fact Sheet Series for Activities Covered by EPA’s Multi Sector General Permit. Available online at: http://cfpub.epa.gov/npdes/stormwater/swsectors.cfm. Parking Area Maintenance SC-43 September 2014 California Stormwater BMP Handbook 1 of 5 Industrial and Commercial www.casqa.org Description Parking lots can contribute a number of substances, such as trash, suspended solids, hydrocarbons, oil and grease, and heavy metals that can enter receiving waters through stormwater runoff or non-stormwater discharges. The protocols in this fact sheet are intended to prevent or reduce the discharge of pollutants from parking areas and include using good housekeeping practices, following appropriate cleaning BMPs, and training employees. BMPs for other outdoor areas on site (loading/unloading, material storage, and equipment operations) are described in SC-30 through SC-33. Approach The goal of this program is to ensure stormwater pollution prevention practices are considered when conducting activities on or around parking areas to reduce potential for pollutant discharge to receiving waters. Successful implementation depends on effective training of employees on applicable BMPs and general pollution prevention strategies and objectives. General Pollution Prevention Protocols  Encourage advanced designs and maintenance strategies for impervious parking lots. Refer to the treatment control BMP fact sheets in this manual for additional information.  Keep accurate maintenance logs to evaluate BMP implementation. Good Housekeeping  Keep all parking areas clean and orderly. Remove debris, litter, and sediments in a timely fashion.  Post “No Littering” signs and enforce anti- litter laws. Objectives  Cover  Contain  Educate  Reduce/Minimize  Product Substitution Targeted Constituents Sediment  Nutrients Trash  Metals  Bacteria Oil and Grease  Organics  Minimum BMPs Covered Good Housekeeping  Preventative Maintenance  Spill and Leak Prevention and Response  Material Handling & Waste Management Erosion and Sediment Controls Employee Training Program  Quality Assurance Record Keeping  Parking Area Maintenance SC-43 September 2014 California Stormwater BMP Handbook 2 of 5 Industrial and Commercial www.casqa.org  Provide an adequate number of litter receptacles.  Clean out and cover litter receptacles frequently to prevent spillage. Preventative Maintenance Inspection Have designated personnel conduct inspections of parking facilities and stormwater conveyance systems associated with parking facilities on a regular basis.  Inspect cleaning equipment/sweepers for leaks on a regular basis. Surface Cleaning  Use dry cleaning methods (e.g., sweeping, vacuuming) to prevent the discharge of pollutants into the stormwater conveyance system if possible.  Establish frequency of public parking lot sweeping based on usage and field observations of waste accumulation.  Sweep all parking lots at least once before the onset of the wet season.  Dispose of parking lot sweeping debris and dirt at a landfill.  Follow the procedures below if water is used to clean surfaces:  Block the storm drain or contain runoff.  Collect and pump wash water to the sanitary sewer or discharge to a pervious surface. Do not allow wash water to enter storm drains.  Follow the procedures below when cleaning heavy oily deposits:  Clean oily spots with absorbent materials.  Use a screen or filter fabric over inlet, then wash surfaces.  Do not allow discharges to the storm drain.  Vacuum/pump discharges to a tank or discharge to sanitary sewer.  Dispose of spilled materials and absorbents appropriately. Surface Repair  Check local ordinance for SUSMP/LID ordinance.  Preheat, transfer or load hot bituminous material away from storm drain inlets.  Apply concrete, asphalt, and seal coat during dry weather to prevent contamination from contacting stormwater runoff.  Cover and seal nearby storm drain inlets where applicable (with waterproof material or mesh) and manholes before applying seal coat, slurry seal, etc. Leave covers in Parking Area Maintenance SC-43 September 2014 California Stormwater BMP Handbook 3 of 5 Industrial and Commercial www.casqa.org place until job is complete and all water from emulsified oil sealants has drained or evaporated. Clean any debris from these covered manholes and drains for proper disposal.  Use only as much water as necessary for dust control during sweeping to avoid runoff.  Catch drips from paving equipment that is not in use with pans or absorbent material placed under the machines. Dispose of collected material and absorbents properly. Spill Response and Prevention Procedures  Keep your Spill Prevention Control and Countermeasure (SPCC) Plan up-to-date.  Place a stockpile of spill cleanup materials where it will be readily accessible or at a central location.  Clean up fluid spills immediately with absorbent rags or material.  Dispose of spilled material and absorbents properly. Employee Training Program  Provide regular training to field employees and/or contractors regarding cleaning of paved areas and proper operation of equipment.  Train employees and contractors in proper techniques for spill containment and cleanup.  Use a training log or similar method to document training. Quality Assurance and Record Keeping  Keep accurate maintenance logs that document minimum BMP activities performed for parking area maintenance, types and quantities of waste disposed of, and any improvement actions.  Keep accurate logs of spill response actions that document what was spilled, how it was cleaned up, and how the waste was disposed.  Establish procedures to complete logs and file them in the central office. Potential Capital Facility Costs and Operation & Maintenance Requirements Facilities  Capital investments may be required at some sites to purchase sweeping equipment, train sweeper operators, install oil/water/sand separators, or implement advanced BMPs. These costs can vary significantly depending upon site conditions and the amount of BMPs required. Parking Area Maintenance SC-43 September 2014 California Stormwater BMP Handbook 4 of 5 Industrial and Commercial www.casqa.org Maintenance  Sweep and clean parking lots regularly to minimize pollutant transport into storm drains from stormwater runoff.  Clean out oil/water/sand separators regularly, especially after heavy storms.  Maintain advanced BMPs such as vegetated swales, infiltration trenches, or detention basins as appropriate. Refer to the treatment control fact sheets for more information. Supplemental Information Advanced BMPs Some parking areas may require advanced BMPs to further reduce pollutants in stormwater runoff, and a few examples are listed below. Refer to the Treatment Control Fact Sheets and the New Development and Redevelopment Manual for more information.  When possible, direct sheet runoff to flow into biofilters (vegetated strip and swale) and/or infiltration devices.  Utilize sand filters or oleophilic collectors for oily waste in low quantities.  Arrange rooftop drains to prevent drainage directly onto paved surfaces.  Design lot to include semi-permeable hardscape. References and Resources City of Seattle, Seattle Public Utilities Department of Planning and Development, 2009. Stormwater Manual Vol. 1 Source Control Technical Requirements Manual. California Stormwater Quality Association, 2003. New Development and Redevelopment Stormwater Best Management Practice Handbook. Available online at: https://www.casqa.org/resources/bmp-handbooks/new-development-redevelopment- bmp-handbook. Kennedy/Jenks Consultants, 2007. The Truckee Meadows Industrial and Commercial Storm Water Best Management Practices Handbook. Available online at: http://www.cityofsparks.us/sites/default/files/assets/documents/env- control/construction/TM-I-C_BMP_Handbook_2-07-final.pdf. Orange County Stormwater Program, Best Management Practices for Industrial/Commercial Business Activities. Available online at: http://ocwatersheds.com/documents/bmp/industrialcommercialbusinessesactivities. Parking Area Maintenance SC-43 September 2014 California Stormwater BMP Handbook 5 of 5 Industrial and Commercial www.casqa.org Pollution from Surface Cleaning Folder, 1996, 2003. Bay Area Stormwater Management Agencies Association. Available online at: http://basmaa.org/Portals/0/documents/pdf/Pollution%20from%20Surface%20Cleani ng.pdf. Sacramento Stormwater Management Program. Best Management Practices for Industrial Storm Water Pollution Control. Available online at: http://www.msa.saccounty.net/sactostormwater/documents/guides/industrial-BMP- manual.pdf. The Storm Water Managers Resource Center, http://www.stormwatercenter.net. US EPA. Post-Construction Stormwater Management in New Development and Redevelopment. BMP Fact Sheets. Available online at: http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm?action=min_measure &min_measure_id=5. Site Design & Landscape Planning SD-10 January 2003 California Stormwater BMP Handbook 1 of 4 New Development and Redevelopment www.cabmphandbooks.com Description Each project site possesses unique topographic, hydrologic, and vegetative features, some of which are 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 community goals and projected growth. Project plan designs should conserve natural areas to the extent possible, maximize natural water storage and infiltration opportunities, and protect slopes and channels. Suitable Applications Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. Design Considerations Design requirements for site design and landscapes planning should conform to applicable standards and specifications of agencies with jurisdiction and be consistent with applicable General Plan and Local Area Plan policies. Design Objectives ; Maximize Infiltration ; Provide Retention ; Slow Runoff ; Minimize Impervious Land Coverage Prohibit Dumping of Improper Materials Contain Pollutants Collect and Convey SD-10 Site Design & Landscape Planning 2 of 4 California Stormwater BMP Handbook January 2003 New Development and Redevelopment www.cabmphandbooks.com Designing New Installations Begin the development of a plan for the landscape unit with attention to the following general principles: Formulate the plan on the 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 suitability 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 and 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 Planning If applicable, 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, and provide fire protection. Maximize trees and other vegetation at each site by planting additional vegetation, clustering tree areas, and promoting 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 wetlands. Maximize Natural Water Storage and Infiltration Opportunities Within the Landscape Unit Promote the conservation of forest cover. Building on land that is already deforested affects basin 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 evapotranspiration, resulting in large peak runoff increases and either their negative effects or the expense of countering them with structural solutions. Maintain natural storage reservoirs and drainage corridors, including depressions, areas of permeable soils, swales, and intermittent streams. Develop and implement policies and Site Design & Landscape Planning SD-10 January 2003 California Stormwater BMP Handbook 3 of 4 New Development and Redevelopment www.cabmphandbooks.com regulations to discourage 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 hydrogeological conditions that cause these facilities to fail. If necessary, locate developments with large amounts of impervious surfaces or a potential to produce relatively contaminated runoff away from groundwater recharge areas. Protection of Slopes and Channels during Landscape Design Convey runoff 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 channel crossings as quickly as possible, and ensure that increases in run-off velocity and frequency caused by the project do not erode the channel. Install energy dissipaters, such as riprap, at the outlets of new storm drains, culverts, conduits, or channels that 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. Line on-site conveyance channels where appropriate, to reduce erosion caused by increased flow velocity due to increases in tributary impervious area. The first choice for linings should be grass or some other vegetative surface, since these materials not only reduce runoff velocities, but also provide water quality benefits from filtration and infiltration. If velocities in the channel are high enough to erode grass or other vegetative linings, riprap, concrete, soil cement, or geo-grid stabilization are other alternatives. Consider other design principles that are comparable and equally effective. Redeveloping Existing Installations Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define “redevelopment” in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. The definition of “ redevelopment” must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under “designing new installations” above should be followed. SD-10 Site Design & Landscape Planning 4 of 4 California Stormwater BMP Handbook January 2003 New Development and Redevelopment www.cabmphandbooks.com Redevelopment may present significant opportunity to add features which had not previously been 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 already existing infrastructure, opportunities should not be missed to maximize infiltration, slow runoff, reduce impervious areas, disconnect directly 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 Western Washington, Washington State Department of Ecology, August 2001. Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002. Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003. Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002. Roof Runoff Controls SD-11 January 2003 California Stormwater BMP Handbook 1 of 3 New Development and Redevelopment www.cabmphandbook.com Description Various roof runoff controls are available to address stormwater that drains off rooftops. The objective is to reduce the total volume and rate of runoff from individual lots, and retain the pollutants on site that may be picked up from roofing materials and atmospheric deposition. Roof runoff controls consist of directing the roof runoff away from paved areas and mitigating flow to the storm drain system through one of several general approaches: cisterns or rain barrels; dry wells or infiltration trenches; pop-up emitters, and foundation planting. The first three approaches require the roof runoff to be contained in a gutter and downspout system. Foundation planting provides a vegetated strip under the drip line of the roof. Approach Design of individual lots for single-family homes as well as lots for higher density residential and commercial structures should consider site design provisions for containing and infiltrating roof runoff or directing roof runoff to vegetative swales or buffer areas. Retained water can be reused for watering gardens, lawns, and trees. Benefits to the environment include reduced demand for potable water used for irrigation, improved stormwater quality, increased groundwater recharge, decreased runoff volume and peak flows, and decreased flooding potential. Suitable Applications Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. Design Considerations Designing New Installations Cisterns or Rain Barrels One method of addressing roof runoff is to direct roof downspouts to cisterns or rain barrels. A cistern is an above ground storage vessel with either a manually operated valve or a permanently open outlet. Roof runoff is temporarily stored and then released for irrigation or infiltration between storms. The number of rain Design Objectives ; Maximize Infiltration ; Provide Retention ; Slow Runoff Minimize Impervious Land Coverage Prohibit Dumping of Improper Materials ; Contain Pollutants Collect and Convey Rain Garden SD-11 Roof Runoff Controls 2 of 3 California Stormwater BMP Handbook January 2003 New Development and Redevelopment www.cabmphandbook.com barrels needed is a function of the rooftop area. Some low impact developers recommend that every house have at least 2 rain barrels, with a minimum storage capacity of 1000 liters. Roof barrels serve several purposes including mitigating the first flush from the roof which has a high volume, amount of contaminants, and thermal load. Several types of rain barrels are commercially available. Consideration must be given to selecting rain barrels that are vector proof and childproof. In addition, some barrels are designed with a bypass valve that filters out grit and other contaminants and routes overflow to a soak-away pit or rain garden. If the cistern has an operable valve, the valve can be closed to store stormwater for irrigation or infiltration between storms. This system requires continual monitoring by the resident or grounds crews, but provides greater flexibility in water storage and metering. If a cistern is provided with an operable valve and water is stored inside for long periods, the cistern must be covered to prevent mosquitoes from breeding. A cistern system with a permanently open outlet can also provide for metering stormwater runoff. If the cistern outlet is significantly smaller than the size of the downspout inlet (say ¼ to ½ inch diameter), runoff will build up inside the cistern during storms, and will empty out slowly after peak intensities subside. This is a feasible way to mitigate the peak flow increases caused by rooftop impervious land coverage, especially for the frequent, small storms. Dry wells and Infiltration Trenches Roof downspouts can be directed to dry wells or infiltration trenches. A dry well is constructed by excavating a hole in the ground and filling it with an open graded aggregate, and allowing the water to fill the dry well and infiltrate after the storm event. An underground connection from the downspout conveys water into the dry well, allowing it to be stored in the voids. To minimize sedimentation from lateral soil movement, the sides and top of the stone storage matrix can be wrapped in a permeable filter fabric, though the bottom may remain open. A perforated observation pipe can be inserted vertically into the dry well to allow for inspection and maintenance. In practice, dry wells receiving runoff from single roof downspouts have been successful over long periods because they contain very little sediment. They must be sized according to the amount of rooftop runoff received, but are typically 4 to 5 feet square, and 2 to 3 feet deep, with a minimum of 1-foot soil cover over the top (maximum depth of 10 feet). To protect the foundation, dry wells must be set away from the building at least 10 feet. They must be installed in solids that accommodate infiltration. In poorly drained soils, dry wells have very limited feasibility. Infiltration trenches function in a similar manner and would be particularly effective for larger roof areas. An infiltration trench is a long, narrow, rock-filled trench with no outlet that receives stormwater runoff. These are described under Treatment Controls. Pop-up Drainage Emitter Roof downspouts can be directed to an underground pipe that daylights some distance from the building foundation, releasing the roof runoff through a pop-up emitter. Similar to a pop-up irrigation head, the emitter only opens when there is flow from the roof. The emitter remains flush to the ground during dry periods, for ease of lawn or landscape maintenance. Roof Runoff Controls SD-11 January 2003 California Stormwater BMP Handbook 3 of 3 New Development and Redevelopment www.cabmphandbook.com Foundation Planting Landscape planting can be provided around the base to allow increased opportunities for stormwater infiltration and protect the soil from erosion caused by concentrated sheet flow coming off the roof. Foundation plantings can reduce the physical impact of water on the soil and provide a subsurface matrix of roots that encourage infiltration. These plantings must be sturdy enough to tolerate the heavy runoff sheet flows, and periodic soil saturation. Redeveloping Existing Installations Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define “redevelopment” in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. The definition of “ redevelopment” must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under “designing new installations” above should be followed. Supplemental Information Examples City of Ottawa’s Water Links Surface –Water Quality Protection Program City of Toronto Downspout Disconnection Program City of Boston, MA, Rain Barrel Demonstration Program Other Resources Hager, Marty Catherine, Stormwater, “Low-Impact Development”, January/February 2003. www.stormh2o.com Low Impact Urban Design Tools, Low Impact Development Design Center, Beltsville, MD. www.lid-stormwater.net Start at the Source, Bay Area Stormwater Management Agencies Association, 1999 Edition Efficient Irrigation SD-12 January 2003 California Stormwater BMP Handbook 1 of 2 New Development and Redevelopment www.cabmphandbooks.com Description Irrigation water provided to landscaped areas may result in excess irrigation water being conveyed into stormwater drainage systems. Approach Project plan designs for development and redevelopment should include application methods of irrigation water that minimize runoff of excess irrigation water into the stormwater conveyance system. Suitable Applications Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. (Detached residential single-family homes are typically excluded from this requirement.) Design Considerations Designing New Installations The following methods to reduce excessive irrigation runoff should be considered, and incorporated and implemented where determined applicable and feasible by the Permittee: Employ rain-triggered shutoff devices to prevent irrigation after precipitation. Design irrigation systems to each landscape area’s specific water requirements. Include design featuring flow reducers or shutoff valves triggered by a pressure drop to control water loss in the event of broken sprinkler heads or lines. Implement landscape plans consistent with County or City water conservation resolutions, which may include provision of water sensors, programmable irrigation times (for short cycles), etc. Design Objectives ; Maximize Infiltration ; Provide Retention ; Slow Runoff Minimize Impervious Land Coverage Prohibit Dumping of Improper Materials Contain Pollutants Collect and Convey SD-12 Efficient Irrigation 2 of 2 California Stormwater BMP Handbook January 2003 New Development and Redevelopment www.cabmphandbooks.com Design timing and application methods of irrigation water to minimize the runoff of excess irrigation water into the storm water drainage system. Group plants with similar water requirements in order to reduce excess irrigation runoff and promote surface filtration. Choose plants with low irrigation requirements (for example, native or drought tolerant species). Consider design features such as: - Using mulches (such as wood chips or bar) in planter areas without ground cover to minimize sediment in runoff - Installing appropriate plant materials for the location, in accordance with amount of sunlight and climate, and use native plant materials where possible and/or as recommended by the landscape architect - Leaving a vegetative barrier along the property boundary and interior watercourses, to act as a pollutant filter, where appropriate and feasible - Choosing plants that minimize or eliminate the use of fertilizer or pesticides to sustain growth Employ other comparable, equally effective methods to reduce irrigation water runoff. Redeveloping Existing Installations Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define “redevelopment” in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. The definition of “ redevelopment” must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under “designing new installations” above should be followed. Other Resources A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002. Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002. Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003. Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002. Storm Drain Signage SD-13 January 2003 California Stormwater BMP Handbook 1 of 2 New Development and Redevelopment www.cabmphandbooks.com Description Waste materials dumped into storm drain inlets can have severe impacts on receiving and ground waters. Posting notices regarding discharge prohibitions at storm drain inlets can prevent waste dumping. Storm drain signs and stencils are highly visible source controls that are typically placed directly adjacent to storm drain inlets. Approach The stencil or affixed sign contains a brief statement that prohibits dumping of improper materials into the urban runoff conveyance system. Storm drain messages have become a popular method of alerting the public about the effects of and the prohibitions against waste disposal. Suitable Applications Stencils and signs alert the public to the destination of pollutants discharged to the storm drain. Signs are appropriate in residential, commercial, and industrial areas, as well as any other area where contributions or dumping to storm drains is likely. Design Considerations Storm drain message markers or placards are recommended at all storm drain inlets within the boundary of a development project. The marker should be placed in clear sight facing toward anyone approaching the inlet from either side. All storm drain inlet locations should be identified on the development site map. Designing New Installations The following methods should be considered for inclusion in the project design and show on project plans: Provide stenciling or labeling of all storm drain inlets and catch basins, constructed or modified, within the project area with prohibitive language. Examples include “NO DUMPING Design Objectives Maximize Infiltration Provide Retention Slow Runoff Minimize Impervious Land Coverage ; Prohibit Dumping of Improper Materials Contain Pollutants Collect and Convey SD-13 Storm Drain Signage 2 of 2 California Stormwater BMP Handbook January 2003 New Development and Redevelopment www.cabmphandbooks.com – DRAINS TO OCEAN” and/or other graphical icons to discourage illegal dumping. Post signs with prohibitive language and/or graphical icons, which prohibit illegal dumping at public access points along channels and creeks within the project area. Note - Some local agencies have approved specific signage and/or storm drain message placards for use. Consult local agency stormwater staff to determine specific requirements for placard types and methods of application. Redeveloping Existing Installations Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define “redevelopment” in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. If the project meets the definition of “redevelopment”, then the requirements stated under “ designing new installations” above should be included in all project design plans. Additional Information Maintenance Considerations Legibility of markers and signs should be maintained. If required by the agency with jurisdiction over the project, the owner/operator or homeowner’s association should enter into a maintenance agreement with the agency or record a deed restriction upon the property title to maintain the legibility of placards or signs. Placement Signage on top of curbs tends to weather and fade. Signage on face of curbs tends to be worn by contact with vehicle tires and sweeper brooms. Supplemental Information Examples Most MS4 programs have storm drain signage programs. Some MS4 programs will provide stencils, or arrange for volunteers to stencil storm drains as part of their outreach program. Other Resources A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002. Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002. Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003. Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002. Trash Storage Areas SD-32 January 2003 California Stormwater BMP Handbook 1 of 2 New Development and Redevelopment www.cabmphandbooks.com Description Trash storage areas are areas where a trash receptacle (s) are located for use as a repository for solid wastes. Stormwater runoff from areas where trash is stored or disposed of can be polluted. In addition, loose trash and debris can be easily transported by water or wind into nearby storm drain inlets, channels, and/or creeks. Waste handling operations that may be sources of stormwater pollution include dumpsters, litter control, and waste piles. Approach This fact sheet contains details on the specific measures required to prevent or reduce pollutants in stormwater runoff associated with trash storage and handling. Preventative measures including enclosures, containment structures, and impervious pavements to mitigate spills, should be used to reduce the likelihood of contamination. Suitable Applications Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. (Detached residential single-family homes are typically excluded from this requirement.) Design Considerations Design requirements for waste handling areas are governed by Building and Fire Codes, and by current local agency ordinances and zoning requirements. The design criteria described in this fact sheet are meant to enhance and be consistent with these code and ordinance requirements. Hazardous waste should be handled in accordance with legal requirements established in Title 22, California Code of Regulation. Wastes from commercial and industrial sites are typically hauled by either public or commercial carriers that may have design or access requirements for waste storage areas. The design criteria in this fact sheet are recommendations and are not intended to be in conflict with requirements established by the waste hauler. The waste hauler should be contacted prior to the design of your site trash collection areas. Conflicts or issues should be discussed with the local agency. Designing New Installations Trash storage areas should be designed to consider the following structural or treatment control BMPs: Design trash container areas so that drainage from adjoining roofs and pavement is diverted around the area(s) to avoid run-on. This might include berming or grading the waste handling area to prevent run-on of stormwater. Make sure trash container areas are screened or walled to prevent off-site transport of trash. Design Objectives Maximize Infiltration Provide Retention Slow Runoff Minimize Impervious Land Coverage Prohibit Dumping of Improper Materials ; Contain Pollutants Collect and Convey SD-32 Trash Storage Areas 2 of 2 California Stormwater BMP Handbook January 2003 New Development and Redevelopment www.cabmphandbooks.com Use lined bins or dumpsters to reduce leaking of liquid waste. Provide roofs, awnings, or attached lids on all trash containers to minimize direct precipitation and prevent rainfall from entering containers. Pave trash storage areas with an impervious surface to mitigate spills. Do not locate storm drains in immediate vicinity of the trash storage area. Post signs on all dumpsters informing users that hazardous materials are not to be disposed of therein. Redeveloping Existing Installations Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define “redevelopment” in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. The definition of “ redevelopment” must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under “designing new installations” above should be followed. Additional Information Maintenance Considerations The integrity of structural elements that are subject to damage (i.e., screens, covers, and signs) must be maintained by the owner/operator. Maintenance agreements between the local agency and the owner/operator may be required. Some agencies will require maintenance deed restrictions to be recorded of the property title. If required by the local agency, maintenance agreements or deed restrictions must be executed by the owner/operator before improvement plans are approved. Other Resources A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002. Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002. Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003. Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002.