Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
Appendix G1 - Preliminary Water Quality Management Plan
APPENDICES APPENDIX G1 Preliminary Water Quality Management Plan Allard Engineering Preliminary Water Quality Management Plan For: PRL Citrus Ave APN No. 0240-011-17 WQMP Citrus Avenue & South Highland Avenue Prepared for: PRL, LLC 16866 Seville Avenue Fontana, CA 92335 Phone: (909)356-1815 Prepared by: Allard Engineering 16866 Seville Avenue Fontana, CA 92335 Phone (909) 356-1815 rallard@allardeng.com Preparation Date: 09/09/2021 Approval Date:_____________________ Allard Engineering Project Owner’s Certification This Water Quality Management Plan (WQMP) has been prepared for PRL, 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):WQMP-Grading Permit Number(s): Tract/Parcel Map Number(s):Building Permit Number(s): CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract): APN(s) : 0240-011-17 Owner’s Signature Owner Name: Title President Company PRL, LLC Address 16866 Seville Avenue, Fontana, CA 92335 Email rallard@allardeng.com Telephone #(909) 356-1815 Signature Date Allard EngineeringPreparer’s Certification Project Data Permit/Application Number(s):WQMP-Grading Permit Number(s): Tract/Parcel Map Number(s):Building Permit Number(s): CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract): APN(s): 0240-011-17 “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:BOBBY ALLARD PE Stamp Below Title VICE PRESIDENT Company Allard Engineering Address 16866 Seville Avenue Email rallard@allardeng.com Telephone # (909) 356-1815 Signature Date APN# 0240-011-17 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 APN# 0240-011-17 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 APN# 0240-011-17 Water Quality Management Plan (WQMP) 1-1 Section 1 Discretionary Permit(s) Form 1-1 Project Information Project Name PRL Citrus Avenue Project Owner Contact Name:Ray Allard Mailing Address:16866 Seville Ave, Fontana, CA 92335 E-mail Address:rallard@allardeng.com Telephone:909-356-1815 Permit/Application Number(s): WQMP- Tract/Parcel Map Number(s): APN# 0240-011-17 Additional Information/ Comments: N/A Description of Project: This project is proposing 4.63 acres of detached and attached single family residential development comprising of 70 lots. The community will include common open space and parking area. The development will have a HOA to maintain the community elements along with the WQMP BMPs for the site. The project will be proposing the frontage street improvements to Citrus Avenue consisting of approximately 400-ft of pavement, curb and gutter and parkway improvements. The proposed parkway frontage improvements are approximately 400-ft which is less than the minimum required length of ½ mile (2,640-ft) and are exempt from treatment per the San Bernardino County Transportation Project Total Guidance Document (TGD). The project is located in the City of Fontana, bounded by Citrus Avenue to the west, Vacant lots to the north, and existing residential tract to the east and south. The existing site undeveloped land with sparse vegetation and drains westerly to Citrus Avenue. The project drainage area (DA-1) consists of a single drainage management area (DMA-1). The proposed onsite drainage includes of a Contech infiltration/retention chamber system- 1,2, catch basins with Flogard insert filter for pre-treatment, ribbon-gutter, grate inlets and drainpipes.For WQMP storm event stormwater will be conveyed to the proposed Contech infiltration/retention chamber system-1,2, from street flow/or storm drains from the proposed drainage management area via the proposed manhole for infiltration.For larger storm events, flows will overflow the Contech infiltration/retention chamber system-1,2, drains to the proposed manhole at the southwest corner of the site via storm drain and discharge via proposed 24”RCP lateral which will tie in to the existing 48”RCP master storm drain system in Citrus Avenue. For emergency overflow, storm water will drain on surface within the right of way and then discharge at the southwest corner of the site to the frontal street gutter in Citrus Avenue via proposed parkway drain which is tributary to the Walnut Avenue master storm drain system (60” RCP, Line D2). 0240-011-17 Water Quality Management Plan (WQMP) 4-3 on surface within the right of way and then discharge at the southwest corner of the site to the frontal street gutter in Citrus Avenue via proposed parkway drain which is tributary to the Walnut Avenue master storm drain system (60” RCP, Line D2). APN# 0240-011-17 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 ft2or 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):201,683 sf 3 Number of Dwelling Units:70 4 SIC Code:N/A 5 Is Project going to be phased? Yes No If yes, ensure that the WQMP evaluates each phase as a distinct DA, requiring LID BMPs to address runoff at time of completion. 6 Does Project include roads? Yes No If yes, ensure that applicable requirements for transportation projects are addressed (see Appendix A of TGD for WQMP) APN# 0240-011-17 Water Quality Management Plan (WQMP) 2-2 2.2 Property Ownership/Management Describe the ownership/management of all portions of the project and site. State whether any infrastructure will transfer to public agencies (City, County, Caltrans, etc.) after project completion. State if a homeowners or property owners association will be formed and be responsible for the long-term maintenance of project stormwater facilities. Describe any lot-level stormwater features that will be the responsibility of individual property owners. Form 2.2-1 Property Ownership/Management Describe property ownership/management responsible for long-term of WQMP stormwater facilities: PRL, LLC. will be responsible to build the site and a HOA will maintain the post-developed BMPs upon completion of construction. Address: PRL, LLC 16866 Seville Avenue, Fontana, CA 92335 - Phone Number: 909-356-1815 - APN# 0240-011-17 Water Quality Management Plan (WQMP) 2-3 2.3 Potential Stormwater Pollutants Determine and describe expected stormwater pollutants of concern based on land uses and site activities (refer to Table 3-3 in the TGD for WQMP). Form 2.3-1 Pollutants of Concern Pollutant Please check: E=Expected, N=Not Expected Additional Information and Comments Pathogens (Bacterial / Virus)E N Bacteria and viruses are a potential pollutant for Residential developments if the land use involves animal waste. Due to the nature of the development, there will be minimal animal waste associated with this land use, and 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 basins as part of Low Impact Design (LID). Phosphorous E N Nitrogen E N Sediment E N Metals E N Not identified in TGD Table 3.3 with detached SFR lots. Oil and Grease E N Trash/Debris E N Pesticides / Herbicides E N Organic Compounds E N Other: Nutrients E N Other: Oxygen Demanding Compounds E N Other:E N APN# 0240-011-17 Water Quality Management Plan (WQMP) 2-4 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. 0240-011-17 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 0240-011-17 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 34.13253ᵒ N Longitude 117.45235ᵒ 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 DMA-1 The project drainage area (DA-1) consists of a single drainage management area (DMA-1). The proposed onsite drainage includes of a Contech infiltration/retention chamber system-1,2, catch basins with Flogard insert filter for pre-treatment, ribbon-gutter, grate inlets and drainpipes.For WQMP storm event stormwater will be conveyed to the proposed Contech infiltration/retention chamber system-1,2, from street flow/or storm drains from the proposed drainage management area via the proposed manhole for infiltration.For larger storm events, flows will overflow the Contech infiltration/retention chamber system-1,2, drains to the proposed manhole at the southwest corner of the site via storm drain and discharge via proposed 24”RCP lateral which will tie in to the existing 48”RCP master storm drain system in Citrus Avenue. For emergency overflow, storm water will drain Outlet 1 (24” RCP Lateral) To 48”RCP SD (Master SD System) DMA-1 Contech System-1 , 2 (For Infiltration & Retention) 0240-011-17 Water Quality Management Plan (WQMP) 4-3 on surface within the right of way and then discharge at the southwest corner of the site to the frontal street gutter in Citrus Avenue via proposed parkway drain which is tributary to the Walnut Avenue master storm drain system (60” RCP, Line D2). 700 ft N➤➤N © 2021 Google © 2021 Google © 2021 Google 0240-011-17 Water Quality Management Plan (WQMP) 4-4 Form 3-2 Existing Hydrologic Characteristics for Drainage Areas (DMA-1) For Drainage Areas 1-3 sub-watershed DMA, provide the following characteristics DMA-1 1 DMA drainage area (ft2)201,683 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 5Longest flowpath length (ft)730 6 Longest flowpath slope (ft/ft)1.0% 7 Current land cover type(s)Select from Fig C-3 of Hydrology Manual Undeveloped- Open Brush 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 100% 700 ft N➤➤N © 2021 Google © 2021 Google © 2021 Google 0240-011-17 Water Quality Management Plan (WQMP) 4-5 Form 3-3 Watershed Description for Drainage Area(s) DMA1 Receiving waters Refer to Watershed Mapping Tool - http://sbcounty.permitrack.com/WAP See ‘Drainage Facilities” link at this website 48” RCP SD per City Stormdrain Improvement Plan 60” RCP City master storm drain in Walnut Avenue Highland Channel San Sevaine Channel Santa Ana River Reach 4 Predo Dam Santa Ana River Reach 3 Applicable TMDLs Refer to Local Implementation Plan Highland Channel: None San Sevaine Channel: NONE Santa Ana River Reach 4: NONE Santa Ana River Reach 3: 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 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 0240-011-17 Water Quality Management Plan (WQMP) 4-6 Unlined Downstream Water Bodies Refer to Watershed Mapping Tool – http://sbcounty.permitrack.com/WAP Highland Channel: Susceptibility - No, Material - EHM San Sevaine Channel: Susceptibility - No, Material - EHM Santa Ana River: Susceptibility - Yes 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 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 WQMP Project Report County of San Bernardino Stormwater Program Santa Ana River Watershed Geodatabase Thursday, September 02, 2021 Note: The information provided in this report and on the Stormwater Geodatabase for the County of San Bernardino Stormwater Program is intended to provide basic guidance in the preparation of the applicant’s Water Quality Management Plan (WQMP) and should not be relied upon without independent verification. Project Site Parcel Number(s):024001117 Project Site Acreage:4.32 HCOC Exempt Area:Yes. Verify that the project is completely with the HCOC exemption area. Closest Receiving Waters: (Applicant to verify based on local drainage facilities and topography.) System Number - 812 Facility Name - Highland Channel Owner - SBCFCD Closest channel segment’s susceptibility to Hydromodification:EHM Highest downstream hydromodification susceptibility:EHM Is this drainage segment subject to TMDLs?No Are there downstream drainage segments subject to TMDLs?No Is this drainage segment a 303d listed stream?No Are there 303d listed streams downstream?No Are there unlined downstream waterbodies?No Project Site Onsite Soil Group(s):A Environmentally Sensitive Areas within 200':None Groundwater Depth (FT):-659 Parcels with potential septic tanks within 1000':Yes Known Groundwater Contamination Plumes within 1000':No Studies and Reports Related to Project Site:Chino Basin Recharge Master Plan Chino Basin Water Master 32nd Annual Report Cactus Basin Summary Report Master Storm Drainage Plan StudySummary Report Master Storm Drainage Plan Map FONTANA MPD FEE STUDY Master SD Hydrology Calcs for Fontana Vol III Master SD Hydrology Calcs For Fontana Vol IIMaster SD Hydrology Calcs for Fontana Vol V Master SD Hydrology Calcs for Fontana Vol IV San Sevaine - Boyle Map 0001 San Sevaine - Boyle Map 0002 San Sevaine - Boyle Map 0003 SBCounty CSDP Project No.2 Volume 1 SBCounty CSDP Project No.2 Volume 2Volume 2 Map SBCounty CSDP Project No.3 Volume I SBCounty CSDP Project No.3 Volume IIWest Fontana Channel Preliminary Basin Study Page 1 of 1San Bernardino -WAP Report 9/2/2021http://permitrack.sbcounty.gov/wap_report/report.asp?septic=Yes&SECAREA=&PNUM=0... 0240-011-17 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. 0240-011-17 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 Summit at Rosena 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 According to the California Stormwater Quality Associations Stormwater Best Management Practice Handbook, landscape planning is implemented to reduce groundwater and storm water contamination. This will be accomplished through an infiltration basins, and landscape areas. 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 V 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 N7 Spill Contingency Plan Project is residential development. 0240-011-17 Water Quality Management Plan (WQMP) 4-9 Form 4.1-1 Non-Structural Source Control BMPs N8 Underground Storage Tank Compliance No underground storage tank on the site. N9 Hazardous Materials Disclosure Compliance 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 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. 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. 0240-011-17 Water Quality Management Plan (WQMP) 4-10 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. 0240-011-17 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 0240-011-17 Water Quality Management Plan (WQMP) 4-12 S10 Covered outdoor processing areas (CASQA New Development BMP Handbook SD-36) No outdoor Processing, Not applicable Included Not 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 0240-011-17 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 system-1,2. Maximize natural infiltration capacity: Yes No Explanation: Contech Infiltration/retention chamber system-1,2 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 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. 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 areas. 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 Contech infiltration/retention chamber system-1,2 are proposed. Utilize vegetated drainage swales in place of underground piping or imperviously lined swales: Yes No Explanation: Runoff will also be intercepted by the infiltration chamber system and multiple landscaped areas. 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 0240-011-17 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 (DMA-1) See attached summary table and calculation sheets for DCV 1 Project area DA-1 (ft2): 201,683 2 Imperviousness after applying preventative site design practices (Imp%): 0.85 3 Runoff Coefficient (Rc): 0.66 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): 0.691 -http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 1.0234 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): 22,326 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 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)=0.85 Total Acreage(A) =4.63 201683 SF 2) Calculate the composite Runoff Coefficient Cbmp for the drainage area Cbmp = 0.858i3-0.78i2+0.774i+0.04 Cbmp =0.66 3) Determine which Regression Coefficient to use by region the project is located in Valley 1.481Mountain1.909 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=0.691 inches P6 = 2 yr 1 hr Rainfall x Regression coefficient P6 =1.0234 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) = 1.3284 7) Calculate the Target Capture Volume, V0, in acre feet V0 = (P0 * A)/12 V0 =0.51 acre-feet V0 =22,326 CF Target Captured Volume Watershed DMA 1 0240-011-17 Water Quality Management Plan (WQMP) 4-15 Refer to the attached design capture volume calculations for drainage management area(s) DMA-1 below: Form 4.2-2 Summary of HCOC Assessment Does project have the potential to cause or contribute to an HCOC in a downstream channel: Yes No Go to:http://sbcounty.permitrack.com/WAP This project site located within the HCOC exempt area. 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 WQMP Project Report County of San Bernardino Stormwater Program Santa Ana River Watershed Geodatabase Thursday, September 02, 2021 Note: The information provided in this report and on the Stormwater Geodatabase for the County of San Bernardino Stormwater Program is intended to provide basic guidance in the preparation of the applicant’s Water Quality Management Plan (WQMP) and should not be relied upon without independent verification. Project Site Parcel Number(s):024001117 Project Site Acreage:4.32 HCOC Exempt Area:Yes. Verify that the project is completely with the HCOC exemption area. Closest Receiving Waters: (Applicant to verify based on local drainage facilities and topography.) System Number - 812 Facility Name - Highland Channel Owner - SBCFCD Closest channel segment’s susceptibility to Hydromodification:EHM Highest downstream hydromodification susceptibility:EHM Is this drainage segment subject to TMDLs?No Are there downstream drainage segments subject to TMDLs?No Is this drainage segment a 303d listed stream?No Are there 303d listed streams downstream?No Are there unlined downstream waterbodies?No Project Site Onsite Soil Group(s):A Environmentally Sensitive Areas within 200':None Groundwater Depth (FT):-659 Parcels with potential septic tanks within 1000':Yes Known Groundwater Contamination Plumes within 1000':No Studies and Reports Related to Project Site:Chino Basin Recharge Master Plan Chino Basin Water Master 32nd Annual Report Cactus Basin Summary Report Master Storm Drainage Plan StudySummary Report Master Storm Drainage Plan Map FONTANA MPD FEE STUDY Master SD Hydrology Calcs for Fontana Vol III Master SD Hydrology Calcs For Fontana Vol IIMaster SD Hydrology Calcs for Fontana Vol V Master SD Hydrology Calcs for Fontana Vol IV San Sevaine - Boyle Map 0001 San Sevaine - Boyle Map 0002 San Sevaine - Boyle Map 0003 SBCounty CSDP Project No.2 Volume 1 SBCounty CSDP Project No.2 Volume 2Volume 2 Map SBCounty CSDP Project No.3 Volume I SBCounty CSDP Project No.3 Volume IIWest Fontana Channel Preliminary Basin Study Page 1 of 1San Bernardino -WAP Report 9/2/2021http://permitrack.sbcounty.gov/wap_report/report.asp?septic=Yes&SECAREA=&PNUM=0... SITE 0240-011-17 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 0240-011-17 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): 0240-011-17 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 0240-011-17 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. 0240-011-17 Water Quality Management Plan (WQMP) 4-20 Form 4.3-1 Infiltration BMP Feasibility (DA 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. 0240-011-17 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. 0240-011-17 Water Quality Management Plan (WQMP) 4-22 Form 4.3-2 Site Design Hydrologic Source Control BMPs (DA 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 0240-011-17 Water Quality Management Plan (WQMP) 4-23 Form 4.3-2 cont. Site Design Hydrologic Source Control BMPs (DA 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 0240-011-17 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). 0240-011-17 Water Quality Management Plan (WQMP) 4-25 Form 4.3-3.1 Infiltration LID BMP –Underground Chamber System 1 Remaining LID DCV not met by site design HSC BMP (ft3): 22,326 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 Chamber System-1 DMA BMP Type Chamber System-2 DMA BMP Type Chamber System 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 12.96 12.96 3 Infiltration safety factor See TGD Section 5.4.2 and Appendix D 3.75 3.75 4 Design percolation rate (in/hr)Pdesign = Item 2 / Item 3 3.46 3.46 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 4.0’5.0’ 7 Ponding Depth (ft)dBMP = Minimum of (1/12*Item 4*Item 5) or Item 6 4.0’5.0’ 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 2,840 3,626 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 -- 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 9,012 ft3 13,884 ft3 16 Total Retention Volume from LID Infiltration BMPs: 22,896ft3 (Sum of Items 14 and 15 for all infiltration BMP included in plan) 17 Fraction of DCV achieved with infiltration BMP: 102%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. Date: Project Name: City / County: State: Designed By: Company: Telephone: Storage Volume Required (cf):9,000 Limiting Width (ft):6.00 0.00 Solid or Perforated Pipe:Perforated Shape Or Diameter (in):48 12.57 ft2 Pipe Area Number Of Headers:2 Spacing between Barrels (ft):0.00 Stone Width Around Perimeter of System (ft):0.5 Depth A: Porous Stone Above Pipe (in):1 Depth C: Porous Stone Below Pipe (in):1 Stone Porosity (0 to 40%):40 System Sizing Pipe Storage:7,125 cf Porous Stone Storage:1,887 cf 9,012 cf 100.1%Of Required Storage Barrel 12 1 barrels Barrel 11 Length per Barrel:559.0 ft Barrel 10 Length Per Header:4.0 ft Barrel 9 Rectangular Footprint (W x L):5. ft x 568. ft Barrel 8 CONTECH Materials Barrel 7 Total CMP Footage:567 ft Barrel 6 Approximate Total Pieces:26 pcs Barrel 5 Approximate Coupling Bands:25 bands Barrel 4 Approximate Truckloads:4 trucks Barrel 3 Construction Quantities**Barrel 2 Total Excavation:0 cy Barrel 1 Porous Stone Backfill For Storage:175 cy stone Backfill to Grade Excluding Stone:-439 cy fill **Construction quantities are approximate and should be verified upon final design Total Storage Provided: Number of Barrels: Invert Depth Below Asphalt (ft): 11/30/2021 Corrugated Metal Pipe Calculator Enter Information in Blue Cells(909) 356-1815 System Layout Number Of Barrels Exceed Graph Limitations PRL, CITRUS AVE SAN BERNARDINO Allard Engineering California Adam Project Summary 559 0 0 0 0 0 0 0 0 0 0 0 Barrel Footage (w/o headers) For design assistance, drawings, and pricing send completed worksheet to: dyods@contech-cpi.com © 2007 CONTECH Stormwater Solutions Date: Project Name: City / County: State: Designed By: Company: Telephone: Storage Volume Required (cf):13,326 Limiting Width (ft):104.00 0.00 Solid or Perforated Pipe:Perforated Shape Or Diameter (in):60 19.63 ft2 Pipe Area Number Of Headers:2 Spacing between Barrels (ft):2.00 Stone Width Around Perimeter of System (ft):1 Depth A: Porous Stone Above Pipe (in):1 Depth C: Porous Stone Below Pipe (in):1 Stone Porosity (0 to 40%):40 System Sizing Pipe Storage:10,642 cf Porous Stone Storage:3,242 cf 13,884 cf 104.2%Of Required Storage Barrel 12 14 barrels Barrel 11 Length per Barrel:25.0 ft Barrel 10 Length Per Header:96.0 ft Barrel 9 Rectangular Footprint (W x L):98. ft x 37. ft Barrel 8 CONTECH Materials Barrel 7 Total CMP Footage:542 ft Barrel 6 Approximate Total Pieces:36 pcs Barrel 5 Approximate Coupling Bands:48 bands Barrel 4 Approximate Truckloads:9 trucks Barrel 3 Construction Quantities**Barrel 2 Total Excavation:0 cy Barrel 1 Porous Stone Backfill For Storage:300 cy stone Backfill to Grade Excluding Stone:-694 cy fill **Construction quantities are approximate and should be verified upon final design Total Storage Provided: Number of Barrels: Invert Depth Below Asphalt (ft): 11/30/2021 Corrugated Metal Pipe Calculator Enter Information in Blue Cells(909) 356-1815 System Layout Number Of Barrels Exceed Graph Limitations PRL, CITRUS AVE SAN BERNARDINO Allard Engineering California Adam Project Summary 25 25 25 25 25 25 25 25 25 25 25 25 Barrel Footage (w/o headers) For design assistance, drawings, and pricing send completed worksheet to: dyods@contech-cpi.com © 2007 CONTECH Stormwater Solutions San Bernardino County Southwestern Part, California TvC—Tujunga gravelly loamy sand, 0 to 9 percent slopes Map Unit Setting National map unit symbol: hcl2 Elevation: 10 to 1,500 feet Mean annual precipitation: 10 to 25 inches Mean annual air temperature: 59 to 64 degrees F Frost-free period: 250 to 350 days Farmland classification: Not prime farmland Map Unit Composition Tujunga and similar soils:85 percent Minor components:15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Tujunga Setting Landform:Alluvial fans Landform position (two-dimensional):Backslope Landform position (three-dimensional):Tread Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from granite Typical profile H1 - 0 to 36 inches: gravelly loamy sand H2 - 36 to 60 inches: gravelly sand Properties and qualities Slope:0 to 9 percent Depth to restrictive feature:More than 80 inches Drainage class:Somewhat excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat):High to very high (5.95 to 19.98 in/hr) Depth to water table:More than 80 inches Frequency of flooding:Rare Frequency of ponding:None Available water supply, 0 to 60 inches: Low (about 3.8 inches) Interpretive groups Land capability classification (irrigated): 4s Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Hydric soil rating: No Map Unit Description: Tujunga gravelly loamy sand, 0 to 9 percent slopes---San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 1 of 2 Minor Components Unnamed Percent of map unit:5 percent Landform:Drainageways Hydric soil rating: Yes Soboba, gravelly loamy sand Percent of map unit:5 percent Hydric soil rating: No Delhi, fine sand Percent of map unit:5 percent Hydric soil rating: No Data Source Information Soil Survey Area: San Bernardino County Southwestern Part, California Survey Area Data: Version 12, May 27, 2020 Map Unit Description: Tujunga gravelly loamy sand, 0 to 9 percent slopes---San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 2 of 2 Soil Map—San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 1 of 33776870377689037769103776930377695037769703776990377701037768703776890377691037769303776950377697037769903777010458180458200458220458240458260458280458300458320458340458360458380458400 458180 458200 458220 458240 458260 458280 458300 458320 458340 458360 458380 458400 34° 7' 59'' N 117° 27' 12'' W34° 7' 59'' N117° 27' 3'' W34° 7' 54'' N 117° 27' 12'' W34° 7' 54'' N 117° 27' 3'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,070 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: San Bernardino County Southwestern Part, California Survey Area Data: Version 12, May 27, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 1, 2018—Jun 30, 2018 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI TvC Tujunga gravelly loamy sand, 0 to 9 percent slopes 4.2 100.0% Totals for Area of Interest 4.2 100.0% Soil Map—San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 3 of 3 0240-011-17 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. 0240-011-17 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. 0240-011-17 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 0240-011-17 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) 0240-011-17 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 0240-011-17 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 (DA 1) 1 Total LID DCV for the Project DMA-1 through DMA-10 (ft3): 22,326 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): 22,896 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 0240-011-17 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. 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 0240-011-17 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). 0240-011-17 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. 0240-011-17 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 Contech Infiltration / Retention Chamber-1,2 System (N4) PRL, LLC Inspect Contech Chamber-1,2 through the 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” 2 times a year at the beginning and end of the rainy season (October to March) Education of Property Owners, Tenants and Occupants on Stormwater BMPs (N1) PRL, 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) PRL, 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 (Hydrodynam- ic seperator, Flowgard filter Insert) (N4) PRL, LLC See BMP fact sheets and Table 5-1 details hereon Litter debris control program (N11) PRL, LLC Litter debris control program may be developed by City of Fontana Ongoing with every visit Employee training (N12) PRL, LLC Employee training may be developed by City of Fontana Ongoing with every visit Catch basin inspection PRL, LLC Catch basins will be inspected a minimum of once every three months during the dry season and a minimum of As stated 0240-011-17 Water Quality Management Plan (WQMP) 5-3 program (N14)once every two months during the rainy season. Form 5-1 BMP Inspection and Maintenance (use additional forms as necessary) BMP Reponsible Party(s)Inspection/ Maintenance Activities Required Minimum Frequency of Activities Provide storm drain system stencilling and signage (S1) PRL, 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) PRL, 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) PRL, LLC New landscaped areas will be constructed at a minimum of 1 inch below existing paved areas Once a year Street Sweeping (N15) PRL, LLC Street weeping and Vaccuming By City of Fontana Bi Monthly TRACT# 20228 Water Quality Management Plan (WQMP) 6-4 Section 6 WQMP Attachments 6.1. Site Plan and Drainage Plan Include a site plan and drainage plan sheet set containing the following minimum information: 6.2 Electronic Data Submittal Minimum requirements include submittal of PDF exhibits in addition to hard copies. Format must not require specialized software to open. If the local jurisdiction requires specialized electronic document formats (as described in their local Local Implementation Plan), this section will describe the contents (e.g., layering, nomenclature, geo-referencing, etc.) of these documents so that they may be interpreted efficiently and accurately. 6.3 Post Construction Attach all O&M Plans and Maintenance Agreements for BMP to the WQMP. 6.4 Other Supporting Documentation BMP Educational Materials Activity Restriction – C, C&R’s & Lease Agreements Project location Site boundary Land uses and land covers, as applicable Suitability/feasibility constraints Structural Source Control BMP locations Site Design Hydrologic Source Control BMP locations LID BMP details Drainage delineations and flow information Drainage connections TRACT# 20228 Water Quality Management Plan (WQMP) 6-5 Section 6 WQMP Certification 6.1 Certification “This Water Quality Management Plan has been prepared for PRL, LLC. by Allard Engineering. It is intended to comply with the requirements of the County of San Bernardino for Rancho Palma Project 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. 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.” PRL, LLC By: PRL, LLC By: _______________________ Date: ___________ Name: Ray Allard Applicant Telephone Number: (909) 356-1815 TRACT# 20228 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 PRL, LLC By: _______________________ Date: ___________ Name: Ray Allard For the use by County of San Bernardino 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 County of San Bernardino’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 PRL, LLC LEGEND: BMP LIST: DMA-5 CITY OF FONTANA WQMP SITE PLAN EXHIBIT CALIFORNIA APN 0240-011-17 BMP STATISTICS: PROPOSED BMPAREA (AC.)MANAGEMENT AREA DESIGN CAPTUREDVOLUME (CF)BMP PROVIDED VOLUMEVOLUME (CF)DRAINAGE IN WALNUT AVE (LINE D2)CITRUS AVENUECONTECH CHAMBER SYSTEM #2 INF/RET CAPACITY: 13,884 CFFOOTPRINT: 98'x37' DMA-1 (4.63 AC) TO 60" RCP MASTER STORM DRAIN 5'Ø EACH 12 BARRELSCONTECH CHAMBER SYSTEM #1 INF/RET CAPACITY: 9,012 CFFOOTPRINT: 568'x5' 4'Ø SINGLE BARRELEMMERGENCY OVERFLOW: DRAINS ON SURFACE, DISCARGE TO STREETVIA PROP. PARKWAY DRAIN48" RCP SDCITY IMPROVEMENT PLANS1 6 1 5 6 10 11 15 18 22 27 23 28 32 3839 43 48 44 49 53 58 54 59 63 68 64 10 22 3023 45 34 57 9 46 5 8 17 16 33 31 33 A B B B A A B B B A A B B B A A B B B A A B B B A A B B B A A A A B B B A A B B B A A B B B A A B B B A A B B B A A B B B A A B B B A B OPEN AREA 24" PROP RCP LATERAL Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey San Bernardino County Southwestern Part, California TvC—Tujunga gravelly loamy sand, 0 to 9 percent slopes Map Unit Setting National map unit symbol: hcl2 Elevation: 10 to 1,500 feet Mean annual precipitation: 10 to 25 inches Mean annual air temperature: 59 to 64 degrees F Frost-free period: 250 to 350 days Farmland classification: Not prime farmland Map Unit Composition Tujunga and similar soils:85 percent Minor components:15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Tujunga Setting Landform:Alluvial fans Landform position (two-dimensional):Backslope Landform position (three-dimensional):Tread Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from granite Typical profile H1 - 0 to 36 inches: gravelly loamy sand H2 - 36 to 60 inches: gravelly sand Properties and qualities Slope:0 to 9 percent Depth to restrictive feature:More than 80 inches Drainage class:Somewhat excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat):High to very high (5.95 to 19.98 in/hr) Depth to water table:More than 80 inches Frequency of flooding:Rare Frequency of ponding:None Available water supply, 0 to 60 inches: Low (about 3.8 inches) Interpretive groups Land capability classification (irrigated): 4s Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Hydric soil rating: No Map Unit Description: Tujunga gravelly loamy sand, 0 to 9 percent slopes---San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 1 of 2 Minor Components Unnamed Percent of map unit:5 percent Landform:Drainageways Hydric soil rating: Yes Soboba, gravelly loamy sand Percent of map unit:5 percent Hydric soil rating: No Delhi, fine sand Percent of map unit:5 percent Hydric soil rating: No Data Source Information Soil Survey Area: San Bernardino County Southwestern Part, California Survey Area Data: Version 12, May 27, 2020 Map Unit Description: Tujunga gravelly loamy sand, 0 to 9 percent slopes---San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 2 of 2 Soil Map—San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 1 of 33776870377689037769103776930377695037769703776990377701037768703776890377691037769303776950377697037769903777010458180458200458220458240458260458280458300458320458340458360458380458400 458180 458200 458220 458240 458260 458280 458300 458320 458340 458360 458380 458400 34° 7' 59'' N 117° 27' 12'' W34° 7' 59'' N117° 27' 3'' W34° 7' 54'' N 117° 27' 12'' W34° 7' 54'' N 117° 27' 3'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,070 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: San Bernardino County Southwestern Part, California Survey Area Data: Version 12, May 27, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 1, 2018—Jun 30, 2018 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI TvC Tujunga gravelly loamy sand, 0 to 9 percent slopes 4.2 100.0% Totals for Area of Interest 4.2 100.0% Soil Map—San Bernardino County Southwestern Part, California Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/8/2021 Page 3 of 3 Educational Material FFFO N T A N AO N T A N AO N T A N A C I T Y O FC I T Y O FC I T Y O F PUBLIC SERVICESPUBLIC SERVICESPUBLIC SERVICES FFO N T A N AO N T A N A C I T Y O FC I T Y O F PUBLIC SERVICESPUBLIC SERVICES FFO N T A N AO N T A N A C I T Y O FC I T Y O F PUBLIC SERVICESPUBLIC SERVICES FFO N T A N AO N T A N A C I T Y O FC I T Y O F PUBLIC SERVICESPUBLIC SERVICES FFFO N T A N AO N T A N AO N T A N A C I T Y O FC I T Y O FC I T Y O F PUBLIC SERVICESPUBLIC SERVICESPUBLIC SERVICES FFO N T A N AO N T A N A C I T Y O FC I T Y O F PUBLIC SERVICESPUBLIC SERVICES FFO N T A N AO N T A N A C I T Y O FC I T Y O F PUBLIC SERVICESPUBLIC SERVICES BMP Fact Sheets Date: Project Name: City / County: State: Designed By: Company: Telephone: Storage Volume Required (cf):9,000 Limiting Width (ft):6.00 0.00 Solid or Perforated Pipe:Perforated Shape Or Diameter (in):48 12.57 ft2 Pipe Area Number Of Headers:2 Spacing between Barrels (ft):0.00 Stone Width Around Perimeter of System (ft):0.5 Depth A: Porous Stone Above Pipe (in):1 Depth C: Porous Stone Below Pipe (in):1 Stone Porosity (0 to 40%):40 System Sizing Pipe Storage:7,125 cf Porous Stone Storage:1,887 cf 9,012 cf 100.1%Of Required Storage Barrel 12 1 barrels Barrel 11 Length per Barrel:559.0 ft Barrel 10 Length Per Header:4.0 ft Barrel 9 Rectangular Footprint (W x L):5. ft x 568. ft Barrel 8 CONTECH Materials Barrel 7 Total CMP Footage:567 ft Barrel 6 Approximate Total Pieces:26 pcs Barrel 5 Approximate Coupling Bands:25 bands Barrel 4 Approximate Truckloads:4 trucks Barrel 3 Construction Quantities**Barrel 2 Total Excavation:0 cy Barrel 1 Porous Stone Backfill For Storage:175 cy stone Backfill to Grade Excluding Stone:-439 cy fill **Construction quantities are approximate and should be verified upon final design Total Storage Provided: Number of Barrels: Invert Depth Below Asphalt (ft): 11/30/2021 Corrugated Metal Pipe Calculator Enter Information in Blue Cells(909) 356-1815 System Layout Number Of Barrels Exceed Graph Limitations PRL, CITRUS AVE SAN BERNARDINO Allard Engineering California Adam Project Summary 559 0 0 0 0 0 0 0 0 0 0 0 Barrel Footage (w/o headers) For design assistance, drawings, and pricing send completed worksheet to: dyods@contech-cpi.com © 2007 CONTECH Stormwater Solutions Date: Project Name: City / County: State: Designed By: Company: Telephone: Storage Volume Required (cf):13,326 Limiting Width (ft):104.00 0.00 Solid or Perforated Pipe:Perforated Shape Or Diameter (in):60 19.63 ft2 Pipe Area Number Of Headers:2 Spacing between Barrels (ft):2.00 Stone Width Around Perimeter of System (ft):1 Depth A: Porous Stone Above Pipe (in):1 Depth C: Porous Stone Below Pipe (in):1 Stone Porosity (0 to 40%):40 System Sizing Pipe Storage:10,642 cf Porous Stone Storage:3,242 cf 13,884 cf 104.2%Of Required Storage Barrel 12 14 barrels Barrel 11 Length per Barrel:25.0 ft Barrel 10 Length Per Header:96.0 ft Barrel 9 Rectangular Footprint (W x L):98. ft x 37. ft Barrel 8 CONTECH Materials Barrel 7 Total CMP Footage:542 ft Barrel 6 Approximate Total Pieces:36 pcs Barrel 5 Approximate Coupling Bands:48 bands Barrel 4 Approximate Truckloads:9 trucks Barrel 3 Construction Quantities**Barrel 2 Total Excavation:0 cy Barrel 1 Porous Stone Backfill For Storage:300 cy stone Backfill to Grade Excluding Stone:-694 cy fill **Construction quantities are approximate and should be verified upon final design Total Storage Provided: Number of Barrels: Invert Depth Below Asphalt (ft): 11/30/2021 Corrugated Metal Pipe Calculator Enter Information in Blue Cells(909) 356-1815 System Layout Number Of Barrels Exceed Graph Limitations PRL, CITRUS AVE SAN BERNARDINO Allard Engineering California Adam Project Summary 25 25 25 25 25 25 25 25 25 25 25 25 Barrel Footage (w/o headers) For design assistance, drawings, and pricing send completed worksheet to: dyods@contech-cpi.com © 2007 CONTECH Stormwater Solutions 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 Design Your own Detention or infiltration sYstemDYODS 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. Site Plan (WQMP Exhibit) Civil Engineering - Land Surveying - Land Planning 16866 Seville Avenue Fontana, California 92335 ALLARD ENGINEERING Prepared By: (909) 356-1815 Fax (909) 356-1795 Prepared For: PRL, LLC LEGEND: BMP LIST: ea DMA-5 CITY OF FONTANA WQMP SITE PLAN EXHIBIT CALIFORNIA APN 0240-011-17 BMP STATISTICS: PROPOSED BMPAREA (AC.)MANAGEMENT AREA DESIGN CAPTURED VOLUME (CF) BMP PROVIDED VOLUME VOLUME (CF) DRAINAGE IN WALNUT AVE (LINE D2)CITRUS AVENUECONTECH CHAMBER SYSTEM #2 INF/RET CAPACITY: 13,884 CF FOOTPRINT: 98'x37' DMA-1 (4.63 AC) TO 60" RCP MASTER STORM DRAIN 5'Ø EACH 12 BARRELSCONTECH CHAMBER SYSTEM #1 INF/RET CAPACITY: 9,012 CF FOOTPRINT: 568'x5' 4'Ø SINGLE BARREL EMMERGENCY OVERFLOW: DRAINS ON SURFACE, DISCARGE TO STREET VIA PROP. PARKWAY DRAIN48" RCP SDCITY IMPROVEMENT PLANS1 6 1 5 6 10 11 15 18 22 27 23 28 32 3839 43 48 44 49 53 58 54 59 63 68 64 10 22 3023 45 34 57 9 46 5 8 17 16 33 31 33 A B B B A A B B B A A B B B A A B B B A A B B B A A B B B A A A A B B B A A B B B A A B B B A A B B B A A B B B A A B B B A A B B B A B OPEN AREA 24" PROP RCP LATERAL