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HomeMy WebLinkAboutAppendix I - Water Quality Management PlanAllard Engineering Preliminary Water Quality Management Plan APN No. 1110-171-02 Baseline & Lime Townhomes, Fontana Fontana, CA 92335 WQMP No. Prepared for: Newbridge Homes, LLC 500 Newport Center Drive, Suite 570 Newport Beach, CA 92660 Phone: (949) 344-2705 Prepared by: Allard Engineering 16866 Seville Avenue Fontana, CA 92335 Phone (909) 356-1815 rallard@allardeng.com Initial Submittal Date: 8/30/2024 Preliminary for Entitlements Complete Date: _____________ Construction WQMP Complete Date: _____________ Final WQMP Approved Date: _______________ Allard Engineering Project Owner’s Certification This Water Quality Management Plan (WQMP) has been prepared for Newbridge Homes, LLC. by Allard Engineering. The WQMP is intended to comply with the requirements of the City of Fontana and the NPDES Area wide 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):Grading Permit Number(s):T.B.D. Tract/Parcel Map Number(s):20686 Building Permit Number(s):T.B.D. CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract):1110-171-02 Owner’s Signature Owner Name:Bryan Avilla Title Manager Company Newbridge Homes, LLC Address 500 Newport Center Drive, Suite 570 Newport Beach, CA 92660 Email BAvilla@newbridgehomes.com Telephone # (949) 344-2701 Signature Date Allard Engineering Preparer’s Certification Project Data Permit/Application Number(s):Grading Permit Number(s):T.B.D. Tract/Parcel Map Number(s):20686 Building Permit Number(s):T.B.D. CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract):1110-171-02 “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:RAYMOND ALLARD PE Stamp Below Title PRESIDENT Company Allard Engineering Address 16866 Seville Avenue Email rallard@allardeng.com Telephone # (909) 356-1815 Signature Date 8/30/2024 Baseline & Lime Townhomes 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 ....................................................... 4-7 4.2 Project Performance Criteria ......................................................................... 4-8 4.3 Project Conformance Analysis ....................................................................... 4-14 4.3.1 Site Design Hydrologic Source Control BMP .............................................. 4-19 4.3.2 Infiltration BMP .......................................................................................... 4-26 4.3.3 Harvest and Use BMP .................................................................................. 4-30 4.3.4 Biotreatment BMP ....................................................................................... 4.31 4.3.5 Conformance Summary ............................................................................... 4-35 4.3.6 Hydromodification Control BMP ............................................................... 4-38 4.4 Alternative Compliance Plan (if applicable) ................................................. 4-39 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 .......................................................................... 6-1 6.2 Electronic Data Submittal ............................................................................. 6-1 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 .......................................................................................... 3-5 Form 4.1-1 Non-Structural Source Control BMP ................................................................... 4-2 Form 4.1-2 Structural Source Control BMP .......................................................................... 4-5 Form 4.1-3 Site Design Practices Checklist ........................................................................... 4-7 Form 4.2-1 LID BMP Performance Criteria for Design Capture Volume ............................. 4-8 Form 4.2-2 Summary of HCOC Assessment .......................................................................... 4-11 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) Contents iii Form 4.2-3 HCOC Assessment for Runoff Volume ............................................................... 4-12 Form 4.2-4 HCOC Assessment for Time of Concentration .................................................. 4-13 Form 4.2-5 HCOC Assessment for Peak Runoff .................................................................... 4-14 Form 4.3-1 Infiltration BMP Feasibility ................................................................................ 4-16 Form 4.3-2 Site Design Hydrologic Source Control BMP ..................................................... 4-20 Form 4.3-3 Infiltration LID BMP ........................................................................................... 4-27 Form 4.3-4 Harvest and Use BMP ......................................................................................... 4-30 Form 4.3-5 Selection and Evaluation of Biotreatment BMP ................................................ 4-31 Form 4.3-6 Volume Based Biotreatment – Bioretention and Planter Boxes w/Underdrains 4-32 Form 4.3-7 Volume Based Biotreatment- Constructed Wetlands and Extended Detention 4-33 Form 4.3-8 Flow Based Biotreatment ................................................................................... 4-34 Form 4.3-9 Conformance Summary and Alternative Compliance Volume Estimate .......... 4-35 Form 4.3-10 Hydromodification Control BMP ..................................................................... 4-38 Form 5-1 BMP Inspection and Maintenance ........................................................................ 5-1 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 1-1 Section 1 Discretionary Permit(s) Form 1-1 Project Information Project Name Baseline & Lime Townhomes, APN: 110-171-02 Project Owner Contact Name:Newbridge Homes, LLC Mailing Address: 500 Newport Center Drive, Suite 570 Newport Beach, CA 92660 E-mail Address: BAvilla@newbridgehomes .com Telephone: (949) 344-2701 Permit/Application Number(s):T.B.D. Tract/Parcel Map Number(s): T.B.D. Additional Information/ Comments: N/A Description of Project: The project is proposing a 54-unit townhome project on 3.33 acres. This new development of residential tract is located in the City of Fontana, County of San Bernardino, State of California. The tract is located at the southeast corner of Baseline Avenue and Orlando Drive and west of Lime Avenue. Currently the site is mostly undeveloped barren land in a single- family residential zoning area (R-1). In the existing condition the project site drains to Orlando Drive on surface. In the proposed condition, the project will consist of townhomes, recreational area, open space area, driveways, alley drive, sidewalks, landscape areas etc. The common areas, driveways and open space area will be maintained by the homeowner’s association (HOA) to be established once development completed. The proposed site drainage area consists of a single drainage management area (DMA-1) 3.33 acres.The primary treatment BMP will be a underground Contech Infiltration Chamber System-1 (CMP-1,2) for water quality volume retention/infiltration. A storm drain system upstream of the chamber system will convey all developed storm water to the chamber system.The inlets for the storm drain system will have ADS FlexStrom filter inserts (or equivalent) for pretreatment. The chamber systems (CMP-1,2) will have an overflow for lager storm volumes to convey flows once the design captured volume has been reached. This overflow system will exit out of the center driveway on surface and drain out into the existing curb and gutter in Orlando Drive and Lime Avenue. The runoff will continue south on Orlando Drive via a curb and gutter until it drains into the existing catch basin in Orlando Dr at the crossing with Village Pkwy. While runoff drains to Lime Avenue will continue south on Lime Avenue via a curb and gutter until it drains into the existing catch basin in Lime Avenue at the crossing with Village Pkwy The flow will follow the existing City Storm Drain System there after and will finally conveys into the Etiwanda/San Sevaine Channel (EHM Channel). Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 1-2 Provide summary of Conceptual WQMP conditions (if previously submitted and approved). Attach complete copy. Baseline & Lime Townhomes 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):145,055 sf 3 Number of Dwelling Units:54 4 SIC Code:1522 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 2-2 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) Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 2-3 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 of WQMP stormwater facilities: Multipy Family Residential development will be owned individually and maintained by the Home Owners Association (HOA). The future HOA will be responsible for maintenance of common area, alley drive, landscaping, stormdrain system and the long term maintenance of the proposed BMPs. The HOA will be formed upon completion of the development. At this time the owner’s responsibility to transfer all operation and maintenance related activities, including a funding mechanism to the HOA. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 2-4 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 a potential pollutant for the mixed used residential site. Due to the nature of the development the site will be treated using site and source and treatment control BMPs. Bacteria and virus can also be detected in pavement runoff, therefore, the site has incorporated treatment control throughout. All paved and hardened surfaces will flow through the proposed grate inlet pre- treatment units prior to discharge into the proposed infiltration chamber system as part of Low Impact Design (LID). Impacted Water Body: Etiwanda/San Sevaine Channel, Santa Ana River Reach 3. Nutrients/Noxious Aquatic Plants E N This mixed used residential site includes landscaping area which will be the potential generation of this type of pollutants. Impacted Water Body: None Sediment / Total suspended solids / pH E N This mixed used residential site which will be the potential generation of this type of pollutants. Metals E N Generates from parking lots Impacted Water Body: Santa Ana River Reach 3. Oil and Grease E N Generates from oil & grease from parked vehicle of the commercial residential project Trash/Debris E N Debris/trash is a potential pollutant from the mixed used residential site. Trash/debris from paved surfaces will be intercepted in the proposed grate inlets with filtration devices as part of the source and treatment control BMPs. Impacted Water Body: None Pesticides / Herbicides E N This mixed used residential site will use pesticides/herbicides for pest control purposes and will be the potential generation of this type of pollutants. Impacted Water Body: None Organic Compounds E N This mixed used residential site includes the usage of solvents which will be the potential generation of this type of pollutants. Impacted Water Body: None Other: Nutrients E N Include nitrogen and phosphorus from usages of fertilizers in the proposed landscape area. Oxygen Demanding Compounds E N Other:E N Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 2-5 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 2-6 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-1 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) N/A Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-2 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 34.121512ᵒ N Longitude -117.521865ᵒ W Thomas Bros Map page PAGE ___ GRID _ _ 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 DA-1: DMA-1 to Outlet 1 The project is proposing a 54-unit townhome project on 3.33 acres. This new development of residential tract is located in the City of Fontana, County of San Bernardino, State of California. The tract is located at the southeast corner of Baseline Avenue and Orlando Drive and west of Lime Avenue. Currently the site is mostly undeveloped barren land in a single-family residential zoning area (R-1). In the existing condition the project site drains to Orlando Drive on surface. In the proposed condition, the project will consist of townhomes, recreational area, open space area, driveways, alley drive, sidewalks, landscape areas etc. The common areas, driveways and open space area will be maintained by the homeowner’s association (HOA) to be established once development completed. Outlet 1 (To Orlando Dr) DA-1: DMA-1 Contech CMP Ret/Inf Chamber System-1 (CMP-1) Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-3 The proposed site drainage area consists of a single drainage management area (DMA-1) 3.33 acres. The primary treatment BMP will be a underground Contech Infiltration Chamber System-1 (CMP-1,2) for water quality volume retention/infiltration. A storm drain system upstream of the chamber system will convey all developed storm water to the chamber system. The inlets for the storm drain system will have ADS FlexStrom filter inserts (or equivalent) for pretreatment. The chamber systems (CMP- 1,2) will have an overflow for lager storm volumes to convey flows once the design captured volume has been reached.This overflow system will exit out of the center driveway on surface and drain out into the existing curb and gutter in Orlando Drive and Lime Avenue. The runoff will continue south on Orlando Drive via a curb and gutter until it drains into the existing catch basin in Orlando Dr at the crossing with Village Pkwy. While runoff drains to Lime Avenue will continue south on Lime Avenue via a curb and gutter until it drains into the existing catch basin in Lime Avenue at the crossing with Village Pkwy The flow will follow the existing City Storm Drain System there after and will finally conveys into the Etiwanda/San Sevaine Channel (EHM Channel). Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-4 Form 3-2 Existing Hydrologic Characteristics for Drainage Area DMA-1 For Drainage Area 1 sub-watershed DMAs, provide the following characteristics DMA-1 1 DMA drainage area (ft2)145,055 sf 2 Existing site impervious area (ft2)0 sf 3 Antecedent moisture condition For desert areas, use http://www.sbcounty.gov/dpw/floodcontrol/pdf/2 0100412_map.pdf III 4 Hydrologic soil group Refer to Watershed Mapping Tool – http://sbcounty.permitrack.com/WAP A 5 Longest flowpath length (ft)602 6 Longest flowpath slope (ft/ft)1.7% 7 Current land cover type(s)Select from Fig C-3 of Hydrology Manual None 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-5 Form 3-3 Watershed Description for Drainage Area DMA1 Receiving waters Refer to Watershed Mapping Tool - http://sbcounty.permitrack.com/WAP See ‘Drainage Facilities” link at this website Existing City Storm Drain System Etwanda/San Sevaine Channel Santa Ana River Reach 3 Prado Basin Santa Ana River Reach 2 Santa Ana River Reach 1 Pacific Ocean Applicable TMDLs Refer to Local Implementation Plan Etwanda/San Sevaine Channel: NONE Pathogens “Bacterial Indicator TMLDs for Middle Santa Ana River Watershed Waterbodies (Bill Rice) Nitrate : Santa Ana River Reach 3 Nitrate TMDL (Hope Smythe) Prado Flood Control basin Pathogens “Bacterial Indicator TMLDs for Middle Santa Ana River Watershed Waterbodies (Bill Rice) Santa Ana River Reach 3 NONE Santa Ana River Reach 2 NONE Santa Ana River Reach 1 NONE Tidal Prism, Santa Ana River NONE 303(d) listed impairments Refer to Local Implementation Plan and Watershed Mapping Tool – http://sbcounty.permitrack.com/WAP and State Water Resources Control Board website – http://www.waterboards.ca.gov/santaana/water_iss ues/programs/tmdl/index.shtml Expected pollutants of concern include organic compounds, trash/debris and oil/grease. Potential pollutants of concern include bacteria vitus, nutrients, pesticides, sediments, and oxygen demanding substances. There is no evidence to suggest that any other pollutants will be produced from the project site other than these 303(d) listed impairment: . Prado Flood Control Basin: Pathogens and Nutrients Santa Ana River Reach 3: Pathogens, Metals (copper & lead) Santa Ana River Reach 2: Pathogens Santa Ana River Reach 1 and Tidal prism Santa Ana River : NONE Environmentally Sensitive Areas (ESA) Refer to Watershed Mapping Tool – http://sbcounty.permitrack.com/WAP NONE Unlined Downstream Water Bodies Refer to Watershed Mapping Tool – http://sbcounty.permitrack.com/WAP Etiwanda/San Sevaine Channel: Susceptibility - No, Material - EHM Santa Ana River: Susceptibility - Yes Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-6 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. The site is located within the HCOC exempt area. 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-7 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-8 Form 4.1-1 Non-Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, if not applicable, state reasonIncludedNot Applicable N1 Education of Property Owners, Tenants and Occupants on Stormwater BMPs Practical education materials will be provided to property owner and proposed HOA Maintenance staffs covering various water quality issues that will need to be addressed on their specific site. These materials will include general practices that contribute to the protection of storm water quality and BMP’s that eliminate or reduce pollution during property improvements. The developer will request these materials in writing at least 30 days prior to intended distribution and will then be responsible for publication and distribution. N2 Activity Restrictions Restrictions may be developed by property owner or other mechanisms. Pesticide applications will be performed by an applicator certified by the California Department of Pesticide Regulation. Vehicle washing will be prohibited. N3 Landscape Management BMPs Maintenance activities for landscape areas shall be consistent with County and manufacturer guidelines for fertilizer and pesticide use. Maintenance includes trimming, weeding and debris removal and vegetation planting and replacement. Stockpiled materials during maintenance activities shall be placed away from drain inlets and runoff conveyance devices. Wastes shall be properly disposed of or recycled. Maintenance for common areas and landscape parking islands is scheduled by future HOA. N4 BMP Maintenance Responsibility for implementation, inspection and maintenance of all BMPs (structural and non-structural) shall be consistent with the BMP Inspection and Maintenance Responsibilities Matrix provided in Section 5, Table 5.1 of this WQMP, with documented records of inspections and maintenance activities completed. Cleaning of all structural BMP Facilities is scheduled by future HOA. N5 Title 22 CCR Compliance (How development will comply) The proposed residential development will not generate waste subject to Title 22 CCR Compliance. N6 Local Water Quality Ordinances Not Applicable Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-9 Form 4.1-1 Non-Structural Source Control BMPs N7 Spill Contingency Plan Project is residential development. Form 4.1-1 Non-Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, if not applicable, state reasonIncludedNot Applicable N8 Underground Storage Tank Compliance No underground storage tank on the site. N9 Hazardous Materials Disclosure Compliance Project is residential development. N10 Uniform Fire Code Implementation The proposed residential project will not store toxic or highly toxic compressed gases. N11 Litter/Debris Control Program Litter control onsite will include the use of litter patrols, violation reporting and clean up during landscaping maintenance activities and as needed to ensure good housekeeping of the project’s common areas. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-10 N12 Employee Training All employees, contractors and subcontractors of the property management shall be trained on the proper use and staging of landscaping and other materials with the potential to impact runoff and proper clean up of spills and materials. N13 Housekeeping of Loading Docks Not applicable N14 Catch Basin Inspection Program As required by the TGD, at least 80% of the project’s private drainage facilities shall be inspected, cleaned/maintained annually, with 100% of facilities inspected and maintained within a two-year period. Drainage facilities include catch basins (storm drain inlets), detention basins, retention basins, open drainage channel. N15 Vacuum Sweeping of Private Streets and Parking Lots The project’s private streets shall be swept, at minimum, prior to the start of the traditional rainy season and as needed. N16 Other Non-structural Measures for Public Agency Projects No other non-structural measures required. N17 Comply with all other applicable NPDES permits No other applicable NPDES permits required. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-11 Form 4.1-2 Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, If not applicable, state reasonIncludedNot Applicable S1 Provide storm drain system stencilling and signage (CASQA New Development BMP Handbook SD-13) Storm drain stencils or signage prohibiting dumping and discharge of materials (“No Dumping – Drains to Ocean”) shall be provided adjacent to each of the project’s proposed inlets. The stencils shall be inspected and re-stenciled as needed to maintain legibility. S2 Design and construct outdoor material storage areas to reduce pollution introduction (CASQA New Development BMP Handbook SD-34) Project does not propose outdoor storage areas. S3 Design and construct trash and waste storage areas to reduce pollution introduction (CASQA New Development BMP Handbook SD-32) No trash and waste storage areas are proposed on the project. S4 Use efficient irrigation systems & landscape design, water conservation, smart controllers, and source control (Statewide Model Landscape Ordinance; CASQA New Development BMP Handbook SD-12) In conjunction with routine landscaping maintenance activities, inspect irrigation for signs of leaks, overspray and repair or adjust accordingly. Adjust system cycle to accommodate seasonal fluctuations in water demand and temperatures. Ensure use of native or drought tolerant/non-invasive plant species to minimize water consumption. S5 Finish grade of landscaped areas at a minimum of 1-2 inches below top of curb, sidewalk, or pavement New landscaped areas will be constructed at a minimum of 1 inch below existing paved areas S6 Protect slopes and channels and provide energy dissipation (CASQA New Development BMP Handbook SD-10) Implemented the following design principles to the project: avoid disturbance of existing westerly channel, constructing retention and detention basins. S7 Covered dock areas (CASQA New Development BMP Handbook SD-31) No covered dock areas, Not applicable S8 Covered maintenance bays with spill containment plans (CASQA New Development BMP Handbook SD-31) No Bays, Not applicable S9 Vehicle wash areas with spill containment plans (CASQA New Development BMP Handbook SD-33) No Vehicle Wash at the site, Not applicable Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-12 S10 Covered outdoor processing areas (CASQA New Development BMP Handbook SD-36) No outdoor Processing, Not applicable Form 4.1-2 Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, If not applicable, state reasonIncludedNot Applicable S11 Equipment wash areas with spill containment plans (CASQA New Development BMP Handbook SD-33) No equipment wash areas, Not applicable S12 Fueling areas (CASQA New Development BMP Handbook SD-30) No Fueling Areas, Not applicable S13 Hillside landscaping (CASQA New Development BMP Handbook SD-10) No Hillside Landscaping, Not applicable S14 Wash water control for food preparation areas No food Preparation, Not applicable S15 Community car wash racks (CASQA New Development BMP Handbook SD -33) No Community Car Wash, Not applicable Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-13 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: We will build multiple park/planter areas in addition to an infiltration/retention chamber for infiltration. Maximize natural infiltration capacity: Yes No Explanation: Infiltration/retention chamber system will be implemented on site. Roof drains will discharge runoff towards pervious area of each lot, indirectly connecting impervious areas before runoff reaches the onsite storm drain infrastructure. Preserve existing drainage patterns and time of concentration: Yes No Explanation: Drainage patterns of all the tributaries that drain through the project will remain unchanged. The time of concentration resulting from the project improvements will be mitigated, if not enhanced, through retention by the proposed infiltration/retention chamber system. Disconnect impervious areas: Yes No Explanation: Where feasible, runoff from the pads is drained towards pervious areas. Runoff from the roof is collected by downspouts and discharged over pervious planter area. Protect existing vegetation and sensitive areas: Yes No Explanation: There are no environmentally sensitive portions onsite and existing vegetation will be kept as much as possible. Re-vegetate disturbed areas: Yes No Explanation: Part of the disturbed areas will be revegeated, see landscape plan. Minimize unnecessary compaction in stormwater retention/infiltration basin/trench areas: Yes No Explanation: No compaction will be performed within the area where the Infiltration-retention chamber system/landscape area are proposed. Utilize vegetated drainage swales in place of underground piping or imperviously lined swales: Yes No Explanation: Not Proposed instead providing Inf/Ret Chamber system. Stake off areas that will be used for landscaping to minimize compaction during construction: Yes No Explanation: No compaction will be performed within the area where landscape areas are proposed. 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-14 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 4.2-1 LID BMP Performance Criteria for Design Capture Volume (DA 1) 1 Project area DA 1 (ft2): 145,055 2 Imperviousness after applying preventative site design practices (Imp%): 0.8% 3 Runoff Coefficient (Rc): 0.60 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): 0.646 http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 0.9567 (Using C1=1.481) 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): 13,605 (Using C2=1.963) 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 Refer to the attached design capture volume calculations for drainage management area DMA-1. 1) Calculate the "Watershed Imperviousness Ratio", I which is equal to the percent of impervious area in the BMP Drainage Area divided by 100 Imperviousness(i)=0.8 Density 16.2 DU/AC > 10 DU/AC Total Acreage(A) =3.33 145,055 SF 2) Calculate the composite Runoff Coefficient Cbmp for the drainage area Cbmp = 0.858i3-0.78i2+0.774i+0.04 Cbmp =0.60 3) Determine which Regression Coefficient to use by region the project is located in Valley 1.481 Mountain 1.909 Desert 1.237 Regression coefficient for this project is:1.481 4) Determine the area averaged "6 hour Mean Storm Rainfall" , P6 2 yr 1 Hr Rainfall Depth per NOAA Atlas 14=0.646 inches P6 = 2 yr 1 hr Rainfall x Regression coefficient P6 =0.9567 inches 5) Determine Regression Constant (a) for 48 hour drawdown a for 24 hour = 1.582 a for 48 hour = 1.963 a =1.963 6) Calculate the Maximized Detention Volume, P0 P0 = C x a x P6 Po(inches) = 1.1255 7) Calculate the Target Capture Volume, V0, in acre feet V0 = (P0 * A)/12 V0 =0.31 acre-feet V0 =13,605 CF Target Captured Volume Watershed DMA-1 (Onsite) Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-15 Project site located within HCOC Exempt Area per City of Fontana WQMP Handbook-HCOC Exempt Areas Map (Figure 2-2)(Attached). Also, the project in developed condition will discharge runoff into the existing street gutter in Orlando Drive in developed condition, for up to 100-yr storm event. Orlando Dr has the street capacity to drain the developed runoff including runoff from area tributary to the street segment. The water will finally drain to the Etiwanda/San Sevaine Channel (EHM) via series of existing City Storm Drain System. 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 Project site is located within the HCOC exempt area. Go to:http://sbcounty.permitrack.com/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 5 – Item 2 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-16 Form 4.2-3 HCOC Assessment for Runoff Volume Weighted Curve Number Determination for: Pre-developed DA 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 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-17 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 DA 1 DMA B DMA C DMA D DA 1 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): 14 Post-developed time of concentration (min): 15 Additional time of concentration needed to meet HCOC requirement (min): Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-18 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 (ft2) 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-19 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-20 Form 4.3-1 Infiltration BMP Feasibility (DMA 1) 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 9 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-21 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-22 Form 4.3-2 Site Design Hydrologic Source Control BMPs (DMA 1) 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-23 Form 4.3-2 cont. Site Design Hydrologic Source Control BMPs (DMA 1) 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): 0 ft3 Vretention =Sum of Item 19 for all BMPs 21 Implementation of Street Trees: Yes No If yes, complete Items 20-2. If no, proceed to Item 24 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): 0 ft3 Vretention = Sum of Item 24 for all BMPs 26 Implementation of residential rain barrels/cisterns: Yes No If yes, complete Items 27-28; If no, proceed to Item 29 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): 0 ft3 Vretention =Sum of Item 28 for all BMPs 30 Total Retention Volume from Site Design Hydrologic Source Control BMPs: 0 ft3 Sum of Items 5, 13, 20, 25 and 29 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-24 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). Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-25 Form 4.3-3 Infiltration LID BMP (DMA 1) 1 Remaining LID DCV not met by site design HSC BMP (ft3): 13,605 ft3 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 DMA 1 BMP Type: Inf. CMP-1 DMA 1 BMP Type: Inf. CMP-2 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 12.97 12.97 3 Infiltration safety factor See TGD Section 5.4.2 and Appendix D 3.50 3.50 4 Design percolation rate (in/hr)Pdesign = Item 2 / Item 3 3.71 3.71 5 Ponded water drawdown time (hr)Copy Item 6 in Form 4.2-1 48 48 6 Maximum ponding depth (ft)BMP specific, see Table 5-4 of the TGD for WQMP for BMP design details 6.0 6.0 7 Ponding Depth (ft)dBMP = Minimum of (1/12*Item 4*Item 5) or Item 6 6.0 6.0 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 1696.5 1696.5 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 -- 10 Amended soil porosity -- 11 Gravel depth,dmedia (ft)Only included in certain BMP types, see Table 5-4 of the TGD for WQMP for BMP design details 1.0 1.0 12 Gravel porosity 0.4 0.4 13 Duration of storm as basin is filling (hrs) Typical ~ 3hrs -- 14 Above Ground Retention Volume (ft3)Vretention = Item 8 * [Item7 + (Item 9 * Item 10) + (Item 11 * Item 12)+ (Item 13 * (Item 4 / 12))] -- 15 Underground Retention Volume (ft3)Volume determined using manufacturer’s specifications and calculations 6,811 ft3 6,811 ft3 - 16 Total Retention Volume from LID Infiltration BMPs: ft3 13,622 (Sum of Items 14 and 15 for all infiltration BMP included in plan) 17 Fraction of DCV achieved with infiltration BMP: 100.1%Retention% = Item 16 / Form 4.2-1 Item 7 18 Is full LID DCV retained on-site with combination of hydrologic source control and LID retention and infiltration BMPs? Yes No 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-26 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). Form 4.3-4 Harvest and Use BMPs 1 Remaining LID DCV not met by site design HSC or infiltration BMP (ft3): 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 and 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-27 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): 0 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. Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-28 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-29 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) Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-30 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-31 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 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 (DMA 1) 1 Total LID DCV for the Project DMA-1 (ft3): 13,605 ft3 Copy Item 7 in Form 4.2-1 2 On-site retention with site design hydrologic source control LID BMP (ft3): 0 ft3 Copy Item 30 in Form 4.3-2 3 On-site retention with LID infiltration BMP (ft3): 13,622 ft3 Copy Item 16 in Form 4.3-3 4 On-site retention with LID harvest and use BMP (ft3): 0 ft3 Copy Item 9 in Form 4.3-4 5 On-site biotreatment with volume based biotreatment BMP (ft3): 0 ft3 Copy Item 3 in Form 4.3-5 6 Flow capacity provided by flow based biotreatment BMP (cfs): 0 ft3 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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-32 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. The site area located within the HCOC exempt area. Therefore Hydromodification Control BMPs not required. 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):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 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 4-33 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). Baseline & Lime Townhomes 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. Baseline & Lime Townhomes 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 Cotech CMP Chamber System- 1(CMP-1,2) Newbridge Homes, LLC Inspect Contech Chamber System through the access manhole to determine the depth of sediment. Follow local and OSHA rules for a confined space entry. JetVac maintenenace is recommended if sediment accumulation depth exceed 3” Immidiately after construction Thereafter Bi-annual inspection Education of Property Owners, Tenants and Occupants on Stormwater BMPs (N1) Newbridge Homes, LLC Practical education materials will be provided to property owners covering various water quality issues that will need to be addressed on their specific site. These materials will include general good house keeping practices that contribute to the protection of storm water quality and BMP’s that eliminate or reduce pollution during property improvements. Ongoing Landscape maintenance (N3) Newbridge Homes, LLC Landscape planning is implemented to reduce groundwater and storm water contamination. This will be accomplished through an infiltration basin, and landscape areas. Monthly BMP maintenance (N4) Newbridge Homes, LLC See BMP fact sheets and Table 5-1 details hereon Ongoing Litter debris control program (N11) Newbridge Homes, LLC Litter debris control program may be developed by City of Rancho Cucamonga Ongoing with every visit Employee training (N12) Newbridge Homes, LLC Employee training may be developed by City of Upland Ongoing with every visit Catch basin inspection program (N14) Newbridge Homes, LLC Catch basins will be inspected a minimum of once every three months during the dry season and a minimum of once every two months during the rainy season. As stated Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 5-3 FloGard Catch basin/Grate insert filter (N14) Newbridge Homes, LLC Inspect catch basin visually for defects and illegal dumping. Removal of collected materials in filter liner using an industrial vacuum. Inspect for defects and serviceability of the filter medium pouches and the pouch tethers. A minimum of once every three months during the dry season and a minimum of once every two months during the rainy season. Provide storm drain system stencilling and signage (S1) Newbridge Homes, LLC Signs will be placed above storm drain inlets to warn the public of prohibitions against waste disposal Place at grate installation and inspect once a year Use efficient irrigation systems & landscape design, water conservation, smart controllers, and source control (S4) Newbridge Homes, LLC Rain sensors will be incorporated into the onsite sprinkler system so that no unnecessary watering of landscaped areas occurs after storm events. Once a year or according to Manufacturer Manuals Finish grade of landscaped areas at a minimum of 1-2 inches below top of curb, sidewalk, or pavement (S5) Newbridge Homes, LLC New landscaped areas will be constructed at a minimum of 1 inch below existing paved areas Once a year Street Sweeping/Vacuu ming (N15) Newbridge Homes, LLC Street weeping and Vaccuming Bi Monthly Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 6-5 Section 6 WQMP Certification 6.1 Certification “This Water Quality Management Plan has been prepared for Newbridge Homes, LLC. by Allard Engineering. It is intended to comply with the requirements of the City of Fontana requiring the preparation of a Water Quality Management Plan (WQMP). The undersigned is aware that Best Management Practices (BMPs) are enforceable pursuant to the City’s Water Quality Ordinance No. 3587. 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 Stormwater 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.” Newbridge Homes, LLC By:________________________ Date: ________________________ Name:Bryan Avilla Its:Manager, Newbridge Homes, LLC Applicant’s Telephone Number: (949) 344-2701 Baseline & Lime Townhomes Water Quality Management Plan (WQMP) 6-6 Certifications I certify under penalty of law that this document and all the attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations Developer’s Project Engineer Signature _____________________________________________________ Signature Date I/we certify that I/we am/are the legal owner of the project and hereby accept the responsibility for the implementation of the provisions of the SWQMP as long as I/we retain ownership of this property and that upon the sale of this land, I/we will deliver this plan to the future owner and inform him of the requirement to implement the plan. Owner(s) Signature Newland Homes, LLC By:________________________ Date: ________________________ Name:Bryan Avilla Its:Manager, Newland Homes, LLC Applicant’s Telephone Number: (949) 344-2701 For the use by City of Fontana Environmental Section Approval of SWQMP I, and /or personnel acting under my direction and supervision, have reviewed this SWQMP and find that it meets the requirements set forth in the City of Fontana’s Storm Water Ordinance. Acceptance or approval of this Storm Water Quality Management Plan in no way precludes the authority of this agency to require modification to the plan as conditions warrant nor does this agency take responsibility for performance of BMP’s provided for in the plan. _______________________________ _______________________ Signature Date of SWQMP approval Laurel Ave Townhomes Water Quality Management Plan (WQMP) 6-7 EXHIBIT A (Legal Description) Page 1 of 1 ORDER NO. : 2676020404 EXHIBIT A The land referred to is situated in the County of San Bernardino, City of Fontana, State of California, and is described as follows: Lot 6 of Etiwanda Vineyards, in the City of Fontana, County of San Bernardino, State of California, recorded in Book 17 Page 29 of Maps, records of San Bernardino County, California, except that portion described as follows: BEGINNING at the southwest corner of said Lot 6; thence along the westerly line of said Lot 6 North 00° 03’ 38” East a distance of 299.90 feet to the southerly right-of-way of Baseline Avenue being 30 feet south of the centerline of Baseline Avenue; thence along the said southerly line North 89° 59’ 10” East a distance of 128.52 feet; thence leaving said southerly line South 00° 00’ 50” East a distance of 30.00 feet; thence South 45° 01’ 03” West a distance of 32.51 feet to the beginning of a non-tangent curve concave northwesterly havng a radius of 884.00 feet with a radial bearing of South 89° 57’ 03” East; thence southerly and southwesterly along said curve through a central angle of 15° 04’ 01” an arc distance of 232.46 feet; thence South 15° 06’ 58” West a distance of 17.79 feet to a point on the southerly line of said Lot 6; thence South 89° 59’ 21” West a distance of 70.62 feet to the POINT OF BEGINNING. Said land is described as Parcel “B” in Certificate of Compliance recorded August 29, 2001 as Instrument No. 20010392777 of Official Records. EXCEPT THEREFROM that portion of Parcel “B” per City of Fontana Lot Line Adjustment No. 01- 1008, recorded August 29, 2001 as Instrument No. 01-0392777, also being a portion of Lot 6 of Etiwanda Vineyard Tract, as recorded Book 17 Page 29, records of the County of San Bernardino, State of California, further described as follows: BEGINNING at the northwest corner of said Parcel B”, also being a point on the northerly line of said Lot 6, said point being 128.52 feet east of the northwest corner of said Lot 6, and 30.00 feet south of the centerline of Baseline Avenue; thence North 89° 59’ 07” East along the northerly line of said Parcel “B”, 506.56 feet to the northeast corner of said Parcel “B”, said corner being 25.00 feet westerly of the centerline of Lime Avenue; thence South 00° 03’ 54” West along the easterly line of said Parcel “B”, 53.04 feet; thence North 89° 56’ 06” West, 9.00 feet; thence North 42° 22’ 21” West, 31.17 feet to a point that is 60.00 feet southerly of the centerline of said Baseline Avenue; thence South 89° 59’ 07” West parallel with said centerline, 476.49 feet to the easterly line of said Parcel “B”; thence North 00° 00’ 53” East, along said easterly line, 30.00 feet to the POINT OF BEGINNING. APN: 1110-171-02-0-000 Laurel Ave Townhomes Water Quality Management Plan (WQMP) 6-8 EXHIBIT B (Vicinity Map) Laurel Ave Townhomes Water Quality Management Plan (WQMP) 6-9 EXHIBIT C (WQMP EXHIBIT) Civil Engineering - Land Surveying - Land Planning 16866 Seville Avenue Fontana, California 92335 ALLARD ENGINEERING Prepared By: PHONE (909) 356-1815 Fax (909) 356-1795 Prepared For:ea Educational Material BMP Fact Sheets Corrugated Metal Pipe Infiltration System Solutions Guide ENGINEERED SOLUTIONS 2 © 2015 Contech Engineered Solutions LLC Stormwater Solutions from Contech Selecting the Right Stormwater Solution Just Got Easier... It’s simple to choose the right stormwater solution to achieve your goals with the Contech Stormwater Solutions Staircase. First, select the runoff reduction practices that are most appropriate for your site, paying particular attention to pretreatment needs. If the entire design storm cannot be retained, select a treatment best management practice (BMP) for the balance. Finally, select a detention system to address any outstanding downstream erosion. Learn more about all of our stormwater technologies at www.ContechES.com/stormwater D esign Y our o wn D etention or i nfiltration s Y stemDYODS The Contech Design Your Own Detention System (DYODS®) tool fully automates the layout process for stormwater detention and infiltration systems and produces CAD and PDF files that can be used for creating plans and specs, and for estimating total installed costs. To use the Design Your Own Detention or Infiltration System tool, visit: www.ContechES.com/dyods 3 Learn more at www.ContechES.com/cmp-detention The only sure way to eliminate stormwater pollution is to eliminate stormwater runoff. In recognition of this fact, Green Infrastructure and Low Impact Development based stormwater management regulations prioritizing runoff reduction have proliferated throughout the United States. Where site conditions allow, infiltration is typically the most cost effective and reliable runoff reduction approach. In urban environments where there are competing demands for land, subsurface infiltration can provide many of the benefits of landscape based systems but without requiring dedicated land area. Infiltration systems are commonly comprised of a pretreatment component designed to remove sediment, trash, and oil, followed by plastic, metal or concrete storage units surrounded by permeable stone creating a high voids storage gallery. Infiltration systems are typically designed to support vehicular loading and to withstand lateral pressures from surrounding soil that allows the overlying land to be used for virtually any non-building application. Subsurface Infiltration as a Stormwater Management Strategy LID benefits include runoff volume reduction, peak flow control, ground water recharge, and water quality improvement. CMP infiltration is used at Pitzer College in Claremont, California. Subsurface infiltration meets the objectives of LID by reducing runoff with the added benefit of saving land space in urban environments. 4 CMP – the “Go To” Material for Subsurface Infiltration The purpose of the storage vessel is to hold stormwater runoff underground while allowing it to infiltrate the surrounding soil. For the majority of applications, corrugated metal pipe (CMP) is the “go to” material for subsurface infiltration. • 75+ year service life guidance for certain materials/ coatings in recommended environments.* Please refer to the Corrugated Metal Pipe Detention Design Guide for additional information. • Various pipe coatings and materials are available to accommodate site-specific needs: Aluminized Steel Type 2 (ALT2), Galvanized, CORLIX® Aluminum, and Polymer Coated. • Wide range of gages, corrugations, and shapes, in diameters 12” – 144”. • Pipe can be fully or partially perforated for infiltration, retention, or groundwater recharge applications. • Custom access risers and manifolds provide direct access for maintenance. • Outlet control devices can be incorporated within the system, eliminating the need for a separate structure. • Customizable - a variety of fittings allow CMP to match most layout configurations. • May be designed for heavy loading and high maximum cover. • Contributes to LEED points. • Available locally; quick turnaround time. • The most economical installed solution. A wide range of CMP diameters and coatings are available to meet site specific needs. CMP can be laid out in configurations not achievable with other materials. With its low cost, a wide variety of diameters, layout configurations, and materials, no other material can match CMP’s flexibility and versatility. * Service life guidance provided by National Corrugated Steel Pipe Association (NCSPA) and/or AK Steel Corporation. See NCSPA.org website or consult your engineer of record for additional information on service life, recommended environments and field studies on various materials and coatings. Corrosive environments, such as seawater and road/de-icing salt infiltration, and other environments with pH and resistivity outside of the recommended range may cause premature corrosion and reduce actual service life. Because site conditions vary, Contech does not guaranty or warrant service life guidance for materials and coatings. 5 Learn more at www.ContechES.com/cmp-detention Some engineers are hesitant to use corrugated metal pipe (CMP) for infiltration because they have heard about CMP drainage culverts that have corroded due to abrasion. Factors affecting longevity differ between culvert and infiltration applications. Culverts experience high velocity flows carrying abrasive sediment, which can wear off galvanized coatings used in older CMP culverts. Infiltration systems are designed for storage rather than conveyance, so velocity and abrasive forces are minimized. In addition, improved CMP coatings, such as Aluminized Type 2 (ALT2), are more abrasion resistant and have demonstrated superior in-ground performance against abrasion in long- term durability studies. Field studies also have indicated that ALT2 coating may extend service life in wider pH and resistivity ranges than galvanized coatings. Confirming and maintaining recommended environmental conditions helps ensure system longevity projected by the long term studies. Finally, properly designed infiltration systems include pretreatment, flow control and a stone backfill envelope that can reduce exposure to abrasion. • National Corrugated Steel Pipe Association (NCSPA) service life guidance of 75+ years for certain materials/coatings in recommended environments. • CMP infiltration systems can be designed to meet HS-20 or greater load requirements with proper depths of cover. • With low flows, CMP infiltration systems have little susceptibility to abrasion inside the pipe that holds stormwater runoff. • Various pipe coatings and materials are available to accommodate site-specific needs: Aluminized Steel Type 2 (ALT2), Galvanized, CORLIX® Aluminum, and Polymer Coated. • CMP infiltration systems are to be surrounded by clean crushed rock to provide increased storage capacity and reduce contact with native soils. The entire system may be wrapped with fabric or liner on the sides and top to help further reduce contact with native soils. • CMP infiltration systems may be used in wide range of recommended environments. AK Steel Corporation’s field studies and technical guidance indicate 75 year service life guidance for 16 gage ALT2 for pH of 5-9 and resistivity greater than 1,500 ohm-cm and 100 year service life guidance for 16 gage ALT2 for pH of 6-8 and resistivity greater than 5,000 ohm-cm. • Corrosive environments, such as seawater and road/de-icing salt infiltration, acidic minewater, and sanitary sewage, and other environments with pH and resistivity outside of the recommended range may cause premature corrosion and reduce actual service life. • Infiltration systems are to be inspected and maintained in accordance with Contech’s guidelines. See Corrugated Metal Pipe Detention Design Guide for additional information on CMP infiltration systems. Addressing the Question of Longevity CMP has a proven service life Learn more about the durability of steel through the recent NCSPA ALT2 Study - www.ncspa.org 6 Maximizing Vertical Space: Every Inch Counts One of the most overlooked advantages of CMP is its ability to maximize vertical storage space. Increasing the depth of a CMP infiltration system allows for more water storage in the same footprint. For example, doubling the diameter of pipe yields four times as much storage volume in the pipe. This provides a significant cost savings per cubic foot of storage. In addition, more vertical storage space means a smaller footprint, less excavation, and lower project costs. 2x the diameter - 4x the storage Diameter (inches) Volume (ft3/ft)Min. Cover Height Diameter (inches) Volume (ft3/ft)Min. Cover Height 12 .78 12”78 33.2 12” 15 1.22 12”84 38.5 12” 18 1.76 12”90 44.2 12” 21 2.40 12”96 50.3 12” 24 3.14 12”102 56.8 18” 30 4.9 12”108 63.6 18” 36 7.1 12”114 70.9 18” 42 9.6 12”120 78.5 18” 48 12.6 12”126 86.6 18” 54 15.9 12”132 95.0 18” 60 19.6 12”138 103.9 18” 66 23.8 12”144 113.1 18” 72 28.3 12” Round Pipe – CMP 6-in to 144-in Sizing 96” diameter - 50.2 ft³/ft 48” diameter - 12.5 ft³/ft Contech’s Corrugated Metal Pipe Detention systems maximize vertical storage space. 7 Learn more at www.ContechES.com/cmp-detention 7 Infiltration systems have multiple components, and one of the most important is pretreatment. The purpose of a pretreatment device is to prolong the life of the infiltration system by removing debris and sediment that can collect on the invert and within the stone backfill voids. Pretreatment will maintain the efficiency of an infiltration system as well as extend the life cycle, therefore preventing a premature replacement. Pretreatment also offers these additional benefits: • Easier to clean and maintain compared to the infiltration system itself. • Cost savings due to the extended service life of the system. • Removing trash and debris protects downstream outlet control structures from clogging. Pretreatment Design Considerations When choosing a pretreatment system, it is important to consider the following: • Downstream outlet control structures may require protection from a pretreatment device that screens trash and debris. • Pretreatment system selection depends on pollutant targets. Trash, debris, and larger particles can be removed with hydrodynamic separators. Removing high percentages of fine particles and associated heavy metals and nutrients requires filtration. • Reduced long term maintenance or replacement cost of the infiltration system can help justify pretreatment construction costs. • Inlet and pipe layout will influence the number and type of pretreatment systems used. A combination of different systems may be appropriate for the various inlet locations and flows. The Need for Effective Pretreatment Pretreatment systems that are easy to maintain and do not rely on the use of geotextile fabric are preferred. 8 Contech offers a number of pretreatment options, all of which will extend the life of subsurface infiltration systems and improve water quality. The type of system chosen will depend on a number of factors including footprint, soil conditions, local regulations, and the desired level of pretreatment. Pretreatment Options CDS provides direct access to cleaning, and the built-in high flow bypass weir eliminates the need for a separate bypass structure. Hydrodynamic Separation Hydrodynamic Separation (HDS) provides a basic level of pretreatment by capturing and retaining trash and debris, sediment, and oil from stormwater runoff. CDS® The CDS uses a combination of swirl concentration and indirect screening and is the only non-blocking screening technology available in an HDS system. Filtration Filtration provides a higher level of pretreatment and improved water quality by removing trash and debris, oil, fine solids, and dissolved pollutants such as metals, hydrocarbons, and nutrients. Filterra® Bioretention System Filterra is an engineered bioretention system that has been optimized for high volume/flow treatment and high pollutant removal. The Stormwater Management StormFilter® The StormFilter system is comprised of a structure that houses rechargeable, media-filled cartridges. The media can be customized to target site-specific pollutants. Jellyfish® Filter The Jellyfish filter uses membrane filtration in a compact footprint to remove a high level and a wide variety of stormwater pollutants such as fine particulates, oil, trash and debris, metals, and nutrients. 9 Learn more at www.ContechES.com/cmp-detention There may be instances where alternative materials are needed for subsurface infiltration due to site specific needs. Plastic Chambers Plastic chambers are best suited to shallow depth applications; minimum cover is 18 inches, and maximum cover is 96 inches. Some benefits of chambers are: • Chambers may be beneficial for sites with limited vertical storage. • Lightweight and installed by hand. • Heavy equipment is not required to set units into place. • Centralized stocking locations for short lead times. Concrete Structures/Vaults Some concrete structures and vaults are best suited for high loading applications such as railroads or airports. Concrete units are also ideal in corrosive environments or areas with high salinity. Some benefits of concrete structures are: • Wide range of spans and heights. • Greater underground infiltration storage in a smaller footprint. • Ample and easy maintenance access. • Fast installation. Alternative Materials for Subsurface Infiltration 10 Project Profiles: CMP Infiltration Systems in Action City Center Regional Stormwater Facility Mountlake Terrace, Washington • The city of Mountlake Terrace, Washington needed a new stormwater retention facility to provide stormwater treatment and downstream flood control. • There was limited footprint for 80,000 CF of runoff, and the system was required to be very deep, with about 15’ of cover. • Engineers designed a system consisting of a CDS pretreatment system in front of 800 linear feet of 120” diameter, perforated, aluminized type 2 CMP that allows the runoff to slowly infiltrate the surrounding soil. • Perforated CMP was selected for its ability to accommodate the deep bury, the relatively small footprint, and cost effectiveness. Creative Office Space El Segundo, California • A stormwater infiltration solution was needed for a new group of office buildings. • The owner wanted to maximize the use of the parking area in the urban setting. • The site had a tight footprint and multiple utility constraints, requiring the design of five separate systems. • A total of 860 LF of perforated CMP was installed providing of 25,265 CF of storage. • Perforated CMP was selected for its design flexibility, cost effectiveness, and ease of installation. Edie and Lew Wasserman Building, UCLA Westwood, California • The new six-story, 100,000 square foot Edie and Lew Wasserman Building was built on a very dense site that needed to meet sustainability requirements. • The design needed to maximize infiltration volume, match existing inverts, and work around existing utilities. • The stormwater management systems included a CDS pretreatment system and a CMP infiltration system using 57’ of 72” perforated CMP. • Perforated CMP was selected to avoid utilities, minimize excavation, meet the City of LA LID requirements, contribute to the building’s LEED certification, and to provide space for the buildings “outdoor room” and gardens. 11 Learn more at www.ContechES.com/cmp-detention The Right Partner Can Make All the Difference Regardless of your project’s objectives and constraints, our team of stormwater design engineers, regulatory managers, and local stormwater consultants are here to provide you with expert advice and assistance. If your goal is to eliminate or detain runoff, you can rely on Contech for a wide range of subsurface infiltration, detention, and rainwater harvesting solutions. If treatment is needed, our landscape-based biofiltration or subsurface filtration designs can fit into virtually any site and can be tailored to address specific pollutants. At every stage of your project, count on Contech to provide engineering services including: • Regulatory guidance and permitting assistance • Preliminary standard details and/or site specific final CAD drawings and specifications • Low Impact Development design assistance • Engineering calculations for hydraulics/hydrology, rainwater harvesting, and detention/retention • Online “Design Your Own” tools • Review of preliminary site design, feasibility screening, and layout assistance • Value engineering – cost estimates and options analysis • Pre-construction support, project scheduling, and contractor coordination • Installation and construction support • Maintenance support: »Guidance manuals »Demonstrations »Qualified contractor identification The result: an efficient design process, the right product, greater land space savings, and faster permitting. The entire Contech stormwater team welcomes the opportunity to work with you on your stormwater projects. To get started, please visit www.conteches.com/localresources or call us at 800-338-1122. We print our brochures entirely on Forest Stewardship Council certified paper. FSC certification ensures that the paper in our brochures contain fiber from well- managed and responsibly harvested forests that meet strict environmental and socioeconomic standards. FSC CMP Infiltration Bro 5M 2/17 NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY. APPLICATIONS SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS AND DECISIONS, AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPLICATION. CONTECH MAKES NO WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, RELATED TO THE APPLICATIONS, MATERIALS, COATINGS, OR PRODUCTS DISCUSSED HEREIN. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH’S CONDITIONS OF SALE (AVAILABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION. ENGINEERED SOLUTIONS ©2017 Contech Engineered Solutions LLC 800-338-1122 | www.ContechES.com All Rights Reserved. Printed in the USA. Get Social With Us! ENGINEERED SOLUTIONS Pipe Solutions Meeting project needs for durability, hydraulics, corrosion resistance, and stiffness • Corrugated Metal Pipe (CMP) • Steel Reinforced Polyethylene (SRPE) • High Density Polyethylene (HDPE) • Polyvinyl Chloride (PVC) Stormwater Solutions Helping to satisfy stormwater management requirements on land development projects • Stormwater Treatment • Detention/Infiltration • Rainwater Harvesting • Biofiltration/Bioretention Structures Solutions Providing innovative options and support for crossings, culverts, and bridges • Plate, Precast & Truss bridges • Hard Armor • Retaining Walls • Tunnel Liner Plate COMPLETE SITE SOLUTIONS Links to Stormwater Tools: To use the Land Value Calculator, visit: www.ContechES.com/lvc (Look under the Stormwater Management section to download the Land Value Calculator) To use the Design Your Own Detention System tool, visit: www.ContechES.com/dyods To use the Design Your Own Hydrodynamic Separator tool, visit: www.ContechES.com/dyohds To use the Rainwater Harvesting Runoff Reduction Calculator tool, visit: www.ContechES.com/rwh-calculator To use the LID Site Planner , visit: www.ContechES.com/LIDsiteplanner Dig Deeper Find all the information you need at www.ContechES.com, including field and laboratory test results, approvals, brochures, design guides, standard details, and specifications within the product section of our site. Connect with Us We're here to make your job easier – and that includes being able to get in touch with us when you need to. Go to www.ContechES.com/ConnectWithContech. While you’re there, be sure to check out our upcoming seminar schedule or request an in-house technical presentation. Start a Project If you are ready to begin a project, contact your local representative to get started. Or you can check out our design toolbox for all our online resources at www.ContechES.com/designtoolbox. Underground stormwater detention and infiltration systems must be inspected and maintained at regular intervals for purposes of performance and longevity. Inspection Inspection is the key to effective maintenance of CMP detention systems and is easily performed. Contech recommends ongoing, quarterly inspections. The rate at which the system collects pollutants will depend more on site specific activities rather than the size or configuration of the system. Inspections should be performed more often in equipment washdown areas, in climates where sanding and/or salting operations take place, and in other various instances in which one would expect higher accumulations of sediment or abrasive/corrosive conditions. A record of each inspection is to be maintained for the life of the system. Maintenance CMP detention systems should be cleaned when an inspection reveals accumulated sediment or trash is clogging the discharge orifice. Accumulated sediment and trash can typically be evacuated through the manhole over the outlet orifice. If maintenance is not performed as recommended, sediment and trash may accumulate in front of the outlet orifice. Manhole covers should be securely seated following cleaning activities. Contech suggests that all systems be designed with an access/inspection manhole situated at or near the inlet and the outlet orifice. Should it be necessary to get inside the system to perform maintenance activities, all appropriate precautions regarding confined space entry and OSHA regulations should be followed. Systems are to be rinsed, including above the spring line, annually soon after the spring thaw, and after any additional use of salting agents, as part of the maintenance program for all systems where salting agents may accumulate inside the pipe. Maintaining an underground detention or infiltration system is easiest when there is no flow entering the system. For this reason, it is a good idea to schedule the cleanout during dry weather. The foregoing inspection and maintenance efforts help ensure underground pipe systems used for stormwater storage continue to function as intended by identifying recommended regular inspection and maintenance practices. Inspection and maintenance related to the structural integrity of the pipe or the soundness of pipe joint connections is beyond the scope of this guide. Contech® CMP Detention Inspection and Maintenance Guide CMP MAINTENANCE GUIDE 2/17 PDF © 2017 Contech Engineered Solutions LLC All rights reserved. Printed in USA. ENGINEERED SOLUTIONS NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY. APPLICATIONS SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS AND DECISIONS, AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPLICATION. CONTECH MAKES NO WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, RELATED TO THE APPLICATIONS, MATERIALS, COATINGS, OR PRODUCTS DISCUSSED HEREIN. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH’S CONDITIONS OF SALE (AVAILABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION CMP DETENTION SYSTEMS Underground stormwater detention and infiltration systems must be inspected and maintained at regular intervals for purposes of performance and longevity. Inspection Inspection is the key to effective maintenance of CMP detention systems and is easily performed. Contech recommends ongoing, annual inspections. Sites with high trash load or small outlet control orifices may need more frequent inspections. The rate at which the system collects pollutants will depend more on- site specific activities rather than the size or configuration of the system. Inspections should be performed more often in equipment washdown areas, in climates where sanding and/or salting operations take place, and in other various instances in which one would expect higher accumulations of sediment or abrasive/ corrosive conditions. A record of each inspection is to be maintained for the life of the system. NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY. APPLICATIONS SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS AND DECISIONS, AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPLICATION. CONTECH MAKES NO WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, RELATED TO THE APPLICATIONS, MATERIALS, COATINGS, OR PRODUCTS DISCUSSED HEREIN. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH’S CONDITIONS OF SALE (AVAILABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION. CMP MAINTENANCE GUIDE 10/19 PDF © 2019 CONTECH ENGINEERED SOLUTIONS LLC, A QUIKRETE COMPANY ALL RIGHTS RESERVED. PRINTED IN USA. Maintenance CMP detention systems should be cleaned when an inspection reveals accumulated sediment or trash is clogging the discharge orifice. Accumulated sediment and trash can typically be evacuated through the manhole over the outlet orifice. If maintenance is not performed as recommended, sediment and trash may accumulate in front of the outlet orifice. Manhole covers should be securely seated following cleaning activities. Contech suggests that all systems be designed with an access/inspection manhole situated at or near the inlet and the outlet orifice. Should it be necessary to get inside the system to perform maintenance activities, all appropriate precautions regarding confined space entry and OSHA regulations should be followed. Annual inspections are best practice for all underground systems. During this inspection if evidence of salting/de-icing agents is observed within the system, it is best practice for the system to be rinsed, including above the spring line soon after the spring thaw as part of the maintenance program for the system. Maintaining an underground detention or infiltration system is easiest when there is no flow entering the system. For this reason, it is a good idea to schedule the cleanout during dry weather. The foregoing inspection and maintenance efforts help ensure underground pipe systems used for stormwater storage continue to function as intended by identifying recommended regular inspection and maintenance practices. Inspection and maintenance related to the structural integrity of the pipe or the soundness of pipe joint connections is beyond the scope of this guide. Contech® CMP Detention Inspection and Maintenance Guide ENGINEERED SOLUTIONS CMP DETENTION SYSTEMS ORLANDO LI M E A V E N U E DRIVE M.B. 284 / 48-51 M. B . 1 7 1 / 2 3 - 2 4 TR A C T N O . 1 0 9 0 7 - 1 e BASELINE & LIME WQMP EXHIBIT CITY OF FONTANA SCALE: 1"= 30' APN 1110-171-02 Civil Engineering - Land Surveying - Land Planning 16866 Seville Avenue Fontana, California 92335 ALLARD ENGINEERING Prepared By: Phone (909) 356-1815 Fax (909) 356-1795 a Prepared By: 15 FREEWAY SITE VICINITY MAP SITE SUMMARY LEGEND CMP-1