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Home My WebLink AboutAppendix H2 - Preliminary Water Quality Management Plan❖ APPENDICES ❖ APPENDIX H2 PRELIMINARY WATER QUALITY MANAGEMENT PLAN UltraSystems wnon nt• • n,:,n ,r,, 1t •pl n,ng Allard Engineering Preliminary Water Quality Management Plan For: Conco Industrial Site 13052 Dahlia Street Fontana, CA 92337 WQMP No. Prepared for: The Conco Companies 5141 Commercial Circle Concord, CA 94520 Prepared by: Allard Engineering 16866 Seville Avenue Fontana, CA 92335 Phone (909) 356-1815 rallard@allardeng.com Preparation Date: 6/15/2023 Revision Date: Allard Engineering Project Owner’s Certification This Water Quality Management Plan (WQMP) has been prepared for The Conco Companies by Allard Engineering. The WQMP is intended to comply with the requirements of the San Bernardino County 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):TBD Tract/Parcel Map Number(s):TBD Building Permit Number(s):TBD CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract):APN (s): 0238-112-16 Owner’s Signature Owner Name: Barry Silberman Title Owner Company The Conco Companies Address 5141 Commercial Circle Concord, CA 94520 Email Telephone # (925) 685-6799 Signature Date I Allard Engineering Preparer’s Certification Project Data Permit/Application Number(s):WQMP Grading Permit Number(s):TBD Tract/Parcel Map Number(s):TBD Building Permit Number(s): CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract): APN (s): 0238-112-16 “The selection, sizing and design of stormwater treatment and other stormwater quality and quantity control measures in this plan were prepared under my oversight and meet the requirements of Regional Water Quality Control Board Order No. R8-2010-0036.” Engineer:RAYMOND ALLARD PE Stamp Below Title PRESIDENT Company Allard Engineering Address 16866 Seville Avenue Email rallard@allardeng.com Telephone # (909) 356-1815 Signature Date Raymond J. Allard 6-20-2023 Conco Industrial Site, Fontana 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 Conco Industrial Site, Fontana 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 1-1 Section 1 Discretionary Permit(s) Form 1-1 Project Information Project Name Conco Industrial Site, Fontana Project Owner Contact Name:Barry Silberman Mailing Address: 5141 Commercial Circle Concord, CA 94520 E-mail Address:Telephone: (925) 685-6799 Permit/Application Number(s):Tract/Parcel Map Number(s): APN (s): 0238-112-16 Additional Information/ Comments: N/A, Description of Project: The project is a proposed redevelopment/expansion of an existing commercial site in the City of Fontana. The proposed project site is a 7.8 acres which consist of existing & proposed commercial building/office building, trucking docks, sidewalk, truck parking, general parking, planters and associated offsite street improvement area on Dahlia Street. The project is located in the City of Fontana, bounded by Dahlia Street in the south, Santa Ana Ave on the north, and existing commercial sites on the east and west. The project is also proposing frontage parkway improvements that include sidewalk, planters and curb & gutter being approximately500-ft (in Dahlia Street). The site drainage area consists of a single drainage management area (DMA-1) based on the proposed flow pattern onsite. DMA-1 (7.8 ac) include existing drywell systems (3 total) and a proposed Contech infiltration/retention chamber system-1 for water quality volume retention/infiltration, a network of storm drain pipe/ribbon gutter/valley gutter conveyance system including grate inlet with trash basket/filter for pre-treatment, a bubbler catch basin and a Contech detention chamber system for high flow detention and mitigation. Stormwater will be conveyed to the below surface Infiltration/Retention Chamber System-1/existing dry well system via the proposed /existing storm drain system onsite for water quality mitigation. The site is exempt for HCOC mitigation in low flow situation (Water quality flow). For storms larger than the water quality, the runoff will overflow the Infiltration/Retention Chamber System will drain into the Detention Chamber System for high flow mitigation. The Detention Chamber will outflow via pipe at a mitigated flow rate into the bubber catch basin at the southwest corner. Whereas the existing drywell system will overflow on surface and drain into the bubbler catch basin at the southwest corner. Water from bubbler catch basin will drain out on surface into the proposed parkway drain which will discharge into the frontal street gutter in Dahlia Street. Water will be continuing drain on the street following the existing street gutter and finally drain into the existing City storm drain system (existing City catch basin) at the intersection of Dahlia Street and Etiwanda Avenue which ultimately drain Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 1-2 into the San Sevaine Channel via existing City Storm Drain System. The proposed parkway frontage improvements are approximately 500-ft which is less than the minimum required length of ½ mile (2,640-ft) and are exempt from water quality treatment per the San Bernardino County Transportation Project Total Guidance Document (TGD). Provide summary of Conceptual WQMP conditions (if previously submitted and approved). Attach complete copy. Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 2-1 Section 2 Project Description 2.1 Project Information This section of the WQMP should provide the information listed below. The information provided for Conceptual/ Preliminary WQMP should give sufficient detail to identify the major proposed site design and LID BMPs and other anticipated water quality features that impact site planning. Final Project WQMP must specifically identify all BMP incorporated into the final site design and provide other detailed information as described herein. The purpose of this information is to help determine the applicable development category, pollutants of concern, watershed description, and long term maintenance responsibilities for the project, and any applicable water quality credits. This information will be used in conjunction with the information in Section 3, Site Description, to establish the performance criteria and to select the LID BMP or other BMP for the project or other alternative programs that the project will participate in, which are described in Section 4. Form 2.1-1 Description of Proposed Project 1 Development Category (Select all that apply): Significant re- development involving the addition or replacement of 5,000 ft2 or more of impervious surface on an already developed site New development involving the creation of 10,000 ft2 or more of impervious surface collectively over entire site Automotive repair shops with standard industrial classification (SIC) codes 5013, 5014, 5541, 7532- 7534, 7536-7539 Restaurants (with SIC code 5812) where the land area of development is 5,000 ft2 or more Hillside developments of 5,000 ft2 or more which are located on areas with known erosive soil conditions or where the natural slope is 25 percent or more Developments of 2,500 ft2 of impervious surface or more adjacent to (within 200 ft) or discharging directly into environmentally sensitive areas or waterbodies listed on the CWA Section 303(d) list of impaired waters. Parking lots of 5,000 ft2 or more exposed to storm water Retail gasoline outlets that are either 5,000 ft2 or more, or have a projected average daily traffic of 100 or more vehicles per day Non-Priority / Non-Category Project May require source control LID BMPs and other LIP requirements. Please consult with local jurisdiction on specific requirements. 2 Project Area (ft2):339,7454 sf 3 Number of Dwelling Units:4 SIC Code:7536-7539 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) ~ □ □ □ □ □ ~ □ □ □ ~ □ ~ Conco Industrial Site, Fontana 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: The Coco Companies will be responsible to build the site and the maintenance of the post-developed BMPs. Contact Name and Address: Barry Silberman 5141 Commercial Circe, Concord, CA 94520 Phone Number: (925) 685-6799 Email: Conco Industrial Site, Fontana 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 Commercial developments. Due to the nature of the development the site will be treated using site and source and treatment control BMPs. Bacteria and virus can also be detected in pavement runoff, therefore, the site has incorporated treatment control throughout. All paved and hardened surfaces will flow through the proposed grate inlet pre- treatment units prior to discharge into the proposed infiltration basins as part of Low Impact Design (LID). Impacted Water Body: Etiwanda Creek Channel, Santa Ana River Reach 3. Nutrients/Noxious Aquatic Plants E N This commercial site includes landscaping area which will be the potential generation of this type of pollutants. Impacted Water Body: None Sediment / Total suspended solids / pH E N This commercial site which will be the potential generation of this type of pollutants. Metals E N Generates from Commercial/Industrial buildings and parking lots. Impacted Water Body: Santa Ana River Reach 3. Oil and Grease E N Generates from oil & grease from parked vehicle of the Commercial project Trash/Debris E N Debris/trash is a potential pollutant for Commercial/Industrial project. Trash/debris from paved surfaces will be intercepted in the proposed grate inlets with filtration devices as part of the source and treatment control BMPs. Impacted Water Body: None Pesticides / Herbicides E N This commercial site will use pesticides/herbicides for pest control purposes and will be the potential generation of this type of pollutants. Impacted Water Body: None Organic Compounds E N This commercial site includes the usage of solvents which will be the potential generation of this type of pollutants. Impacted Water Body: None Other: Nutrients E N Include nitrogen and phosphorus from usages of fertilizers in the proposed landscape area. Oxygen Demanding Compounds E N Include oxygen demand from the proposed landscape area. Other:E N C8l □ C8l □ C8l □ C8l □ C8l □ C8l □ C8l □ C8l □ C8l □ C8l □ □ □ Conco Industrial Site, Fontana 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. Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-5 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 □ □ □ □ □ □ □ □ □ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-6 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 34.054199ᵒ N Longitude 117.520694ᵒ 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 TO Outlet 1 The project is a proposed redevelopment/expansion of an existing commercial site in the City of Fontana. The proposed project site is a 7.8 acres which consist of existing & proposed commercial building/office building, trucking docks, sidewalk, truck parking, general parking, planters and associated offsite street improvement area on Dahlia Street. The project is located in the City of Fontana, bounded by Dahlia Street in the south, Santa Ana Ave on the north, and existing commercial sites on the east and west. Outlet 1 Surface Flow to Street Gutter DMA-1 Retention/Infiltration Chamber System Ex. Drywell System City Storm Drain System San Sevaine Channel ~ □ □ ~ I I -I I I ~ I i \ I I I I Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-7 The project is also proposing frontage parkway improvements that include sidewalk, planters and curb & gutter being approximately500-ft (in Dahlia Street). The site drainage area consists of a single drainage management area (DMA-1) based on the proposed flow pattern onsite. DMA-1 (7.8 ac) include existing drywell systems (3 total) and a proposed Contech infiltration/retention chamber system-1 for water quality volume retention/infiltration, a network of storm drain pipe/ribbon gutter/valley gutter conveyance system including grate inlet with trash basket/filter for pre-treatment, a bubbler catch basin and a Contech detention chamber system for high flow detention and mitigation. Stormwater will be conveyed to the below surface Infiltration/Retention Chamber System-1/existing dry well system via the proposed /existing storm drain system onsite for water quality mitigation. The site is exempt for HCOC mitigation in low flow situation (Water quality flow). For storms larger than the water quality, the runoff will overflow the Infiltration/Retention Chamber System will drain into the Detention Chamber System for high flow mitigation. The Detention Chamber will outflow via pipe at a mitigated flow rate into the bubber catch basin at the southwest corner. Whereas the existing drywell system will overflow on surface and drain into the bubbler catch basin at the southwest corner. Water from bubbler catch basin will drain out on surface into the proposed parkway drain which will discharge into the frontal street gutter in Dahlia Street. Water will be continuing drain on the street following the existing street gutter and finally drain into the existing City storm drain system (existing City catch basin) at the intersection of Dahlia Street and Etiwanda Avenue which ultimately drain into the San Sevaine Channel via existing City Storm Drain System. The proposed parkway frontage improvements are approximately 500-ft which is less than the minimum required length of ½ mile (2,640-ft) and are exempt from water quality treatment per the San Bernardino County Transportation Project Total Guidance Document (TGD). Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-8 Form 3-2 Existing Hydrologic Characteristics for Drainage Areas (DA-1) For Drainage Areas 1-3 sub-watershed DMA, provide the following characteristics DA-1 1 DMA drainage area (ft2)339,745 sf 2 Existing site impervious area (ft2)*138,085 sf 3 Antecedent moisture condition For desert areas, use http://www.sbcounty.gov/dpw/floodcontrol/pdf/2 0100412_map.pdf II 4 Hydrologic soil group Refer to Watershed Mapping Tool – http://sbcounty.permitrack.com/WAP A 5 Longest flowpath length (ft)667 6 Longest flowpath slope (ft/ft)1.5% 7 Current land cover type(s)Select from Fig C-3 of Hydrology Manual Developed-with bldg. & compacted gravel surface 8 Pre-developed pervious area condition: Based on the extent of wet season vegetated cover good >75%; Fair 50-75%; Poor <50% Attach photos of site to support rating Poor *Including site area with compacted gravel paved surface (assuming 20% impervious) in existing condition. Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-9 Form 3-3 Watershed Description for Drainage Area(s) DA1 Receiving waters Refer to Watershed Mapping Tool - http://sbcounty.permitrack.com/WAP See ‘Drainage Facilities” link at this website Existing City Storm Drain System (52” RCP) in Etiwanda Avenue San Savaine Channel Santa Ana River Reach 3 Predo Dam Applicable TMDLs Refer to Local Implementation Plan Santa Ana River Reach 3: Pathogens Prado Flood Control basin 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 303(d) listed impairment Santa Ana River Reach 3: Pathogens, Metals (copper & lead) Prado Flood Control Basin: pH 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 Unlined Downstream Water Bodies Refer to Watershed Mapping Tool – http://sbcounty.permitrack.com/WAP Santa Ana River 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. Site is completely within the HCOC Exempt area. Watershed–based BMP included in a RWQCB approved WAP Yes Attach verification of regional BMP evaluation criteria in WAP • More Effective than On-site LID • Remaining Capacity for Project DCV • Upstream of any Water of the US • Operational at Project Completion • Long-Term Maintenance Plan No □ ~ □ ~ JUR U P A B A S I N I-10 FREEW AY JU R U P A A V E MA R L A Y A V E SL O V E R A V E SA N T A A N A A V E DE C L E Z S O U T H LO W E R ET I W A N D A I- 1 0 SO U T H SS - 1 0 SS - 8 SS - 5 B SS - 5 A 54 " 69 " 36 " 51 " 39 " 42 " 57 " 54 " 45 " 36 " 42 " 4 8 " 7 2 " 78 " 39 " 4 2 " 54 " 48 " 10 0 Y E AR 10 0 Y E A R 60 " 66 " 42 " 66 " CA L T R AN S 10 0 Y E A R 42 " 42 " 39 " 78 " 36 " CHA NNEL 42 "SS - 7 42 "10 0 Y E AR 10 0 Y E A R SS - 6 10 0 Y E A R 10 0 Y E A R 25 Y E A R 10 0 Y E AR 5 ET I W A N D A "' :-r::~ [7 ~<.-~.~~ -~ r~ ozri:--+-~1. A~ II ' j: i1 i W e l ozf1 i J ~ .. 1;----"J l "·[Siaa 1■"-■,,--■---■1 ■1 ■1■■1 i 1 11 (l"i"'.' \ DZ~1r ! ,;,-~ YEA I + ' 'I 78 ' 1/""'0' I CHEB.RY11= 45• 39• ---unmr-urUl■l■ ui 11i-i.1■1n111■1D1II llll■llll l L'"-r~ 1-.. 1 1-~ DZ-13 ' l ; ,.,. 45' 39' ~. --, L -,r . \ n7_ 1b 11 ~5 YEAI , I.. 39' 1■1111 'i--~r-:, r si t e 30 " R C P CI T Y S D 54 " R C P CI T Y S D ·2 Dat,lla S.t -2 SITE Dani.a St • • a Gateway /U3/t 11 145 B 14 A-9 30" RCP CITY SD EX. CB CITY SD 54" RCP CITY SD SAN SAVAINE CHANNEL Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-10 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. 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 The Conco 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 will be developed by property owner. 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, drought tolerance landscapeing will be implemented to reduce ~ □ ~ □ ~ □ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-11 Form 4.1-1 Non-Structural Source Control BMPs groundwater and storm water contamination. Also will be accomplished by the proposed infiltration basin. Application of fertilizers/pesticides by licensed persons. N4 BMP Maintenance The Owner will be responsible for BMP maintenance N5 Title 22 CCR Compliance (How development will comply) Not applicable, This site will not generate any hazardous waste of any kind. N6 Local Water Quality Ordinances Comply with any applicable local water quality ordinances through this WQMP. N7 Spill Contingency Plan The spill contingency plan shall be provided in accordance with Section 6.95 of the California Health and Safety Code. Onsite spill contingency includes: Store material indoor, label containers, check for leaks and spills, follow proper disposal procedure, train employee’s prevention control and counter measure plan, identify and notify to key spill response authorities/personnel. N8 Underground Storage Tank Compliance No underground storage tank on the site. N9 Hazardous Materials Disclosure Compliance No hazardous materials in the site. N10 Uniform Fire Code Implementation No hazardous materials in the site. N11 Litter/Debris Control Program Will be responsible by landscaper contractor assigned by the owner. Litter/debris control a minimum of once every two weeks. N12 Employee Training All employees will be trained administered by the owner, once in a year. N13 Housekeeping of Loading Docks Loading Docks will be in a clean and orderly condition through sweeping and litter control and immediate cleanup of spills and broken containers. Owner assigned personnel will maintain the loading docks. N14 Catch Basin Inspection Program Catch basins will be inspected a minimum of once every three months during the dry season and a minimum of once every two months during the rainy season. ~ □ □ ~ ~ □ ~ □ □ ~ □ ~ □ ~ ~ □ ~ □ ~ □ ~ □ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-12 Form 4.1-1 Non-Structural Source Control BMPs N15 Vacuum Sweeping of Private Streets and Parking Lots Parking lot and onsite pavement will be vacuum swept by the owner assigned landscape contractor. At a minimum all paved areas shall be swept, in late summer or early fall. Prior to the start of the rainy season or equivalent, as govern by the governing jurisdiction. N16 Other Non-structural Measures for Public Agency Projects Not applicable, not a public agency project. N17 Comply with all other applicable NPDES permits Yes, if verbiage of construction general permit, or swppp. ~ □ □ ~ ~ □ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-13 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) Signs will be placed above storm drain inlets to warn the public of prohibitions against waste disposal. The sign will be “No Dumping-Drains to Waterways”. Monitor and maintain once a year or manufacturer recommendations S2 Design and construct outdoor material storage areas to reduce pollution introduction (CASQA New Development BMP Handbook SD-34) No material storages areas in the project S3 Design and construct trash and waste storage areas to reduce pollution introduction (CASQA New Development BMP Handbook SD-32) Paved and permanently roofed Trash enclosure will be built, and will be maintained by the owner or owner assigned operator. 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) Rain sensors will be incorporated into the onsite sprinkler system so that no unnecessary watering of landscaped areas occurs after storm events. 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) Basin slopes and swale entry’s will be provided with rock rip rap. S7 Covered dock areas (CASQA New Development BMP Handbook SD-31) Will be provided with roofed dock area and overflow containment structure. S8 Covered maintenance bays with spill containment plans (CASQA New Development BMP Handbook SD-31) Will be provided with roofed maintenance bays and containment structure to capture wash water leaks and spills. S9 Vehicle wash areas with spill containment plans (CASQA New Development BMP Handbook SD-33) No carwash, Not applicable ~ □ □ ~ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ □ ~ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-14 S10 Covered outdoor processing areas (CASQA New Development BMP Handbook SD-36) No outdoor Processing, Not applicable Form 4.1-2 Structural Source Control BMPs Identifier Name Check One Describe BMP Implementation OR, If not applicable, state reasonIncludedNot Applicable S11 Equipment wash areas with spill containment plans (CASQA New Development BMP Handbook SD-33) No equipment washing, Not applicable S12 Fueling areas (CASQA New Development BMP Handbook SD-30) No Fueling, 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 □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-15 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. 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-16 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 planter and landscape areas in addition to an infiltration/retention chamber system. This commercial site will be approximately 90% impervious in fully developed condition. Maximize natural infiltration capacity: Yes No Explanation: Part of Runoff from impervious surfaces will be conveyed through landscaped areas so that infiltration is maximized. Runoff will also be intercepted by an infiltration/retention chamber system. Preserve existing drainage patterns and time of concentration: Yes No Explanation: The site currently drains South. Post developed flow will also drain south this is consistent with existing and Master Planned flow patterns.Time of concentration will be increased due to the runoff retention in the Ret/Inf chamber system to achieve the existing condition TOC. Disconnect impervious areas: Yes No Explanation: Part of impervious/roof areas will drain into landscaped areas. Protect existing vegetation and sensitive areas: Yes No Explanation: There are no environmentally sensitive portions onsite. Re-vegetate disturbed areas: Yes No Explanation: Part of disturbed areas will be revegeated, see landscape plan. Minimize unnecessary compaction in stormwater retention/infiltration basin/trench areas: Yes No Explanation: No compaction will be performed within the area where the infiltration chamber system and landscape areas are proposed by building temporary fence during the construction around those areas. Utilize vegetated drainage swales in place of underground piping or imperviously lined swales: Yes No Explanation: Runoff will also be intercepted by the infiltration/retention 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 by building temporary fence during the construction. ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ □ ~ ~ □ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-17 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. Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-18 Form 4.2-1 LID BMP Performance Criteria for Design Capture Volume (DMA-1 in Developed Condition)See attached calculation sheets for DCV 1 Project area DMA-1 (ft2): 339,745 2 Imperviousness after applying preventative site design practices (Imp%):92% . 3 Runoff Coefficient (Rc): 0.76 Rc = 0.76 (Imp%)^3-0.78(Imp%)^2+0.774(Imp%)+0.04 Varies for each DMAs. See provided Calculation Sheets in the following pages. 4 Determine 1-hour rainfall depth for a 2-year return period P2yr-1hr (in): -http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 0.518 inches. 5 Compute P6, Mean 6-hr Precipitation (inches): 0.7672 for all DMAs. See provided Calculation Sheets in the following pages. 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): 32,406 DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24-hr = 1.582; 48-hr = 1.963) Compute separate DCV for each outlet from the project site per schematic drawn in Form 3-1 Item 2 Refer to the attached design capture volume calculations for drainage management area DMA-1 below: □ ~ 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)=0.92 Total Acreage(A) =7.80 339745 SF 2) Calculate the composite Runoff Coefficient Cbmp for the drainage area Cbmp = 0.858i3-0.78i2+0.774i+0.04 Cbmp =0.76 3) Determine which Regression Coefficient to use by region the project is located in Valley 1.481 Mountain 1.909 Desert 1.237 Regression coefficient for this project is:1.481 4) Determine the area averaged "6 hour Mean Storm Rainfall" , P6 2 yr 1 Hr Rainfall Depth per NOAA Atlas 14=0.518 inches P6 = 2 yr 1 hr Rainfall x Regression coefficient P6 =0.7672 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) = 1.1445 7) Calculate the Target Capture Volume, V0, in acre feet V0 = (P0 * A)/12 V0 =0.74 acre-feet V0 =32,406 CF Target Captured Volume Site in Developed Condition Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-19 Project site located within the HCOC Exempt Area per City of Fontana HCOC Exempt Area Map. Also the project in developed condition will discharge to the existing City storm drain system in Etiwanda Avenue adjacent to the site after mitigation of the high flows for 100-yr storm event by onsite detention facility. 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 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 City of Fontana WQMP Handbook September 2016 - 7 - Figure 2-2 HCOC Exempt Areas HCOC Exempt Areas City of Fontana WQMP H andbook 0 1 2 Miles N A --Receiving Water -Basin/Dam •••• 1 , •• City of Fontana HCOC Exempt Area s 1-Sump Conditions 3-Div ersion to Storage 1-Sump Conditions, 3-Diversion to Storage SITE JUR U P A B A S I N I-10 FREEW AY JU R U P A A V E MA R L A Y A V E SL O V E R A V E SA N T A A N A A V E DE C L E Z S O U T H LO W E R ET I W A N D A I- 1 0 SO U T H SS - 1 0 SS - 8 SS - 5 B SS - 5 A 54 " 69 " 36 " 51 " 39 " 42 " 57 " 54 " 45 " 36 " 42 " 4 8 " 7 2 " 78 " 39 " 4 2 " 54 " 48 " 10 0 Y E AR 10 0 Y E A R 60 " 66 " 42 " 66 " CA L T R AN S 10 0 Y E A R 42 " 42 " 39 " 78 " 36 " CHA NNEL 42 "SS - 7 42 "10 0 Y E AR 10 0 Y E A R SS - 6 10 0 Y E A R 10 0 Y E A R 25 Y E A R 10 0 Y E AR 5 ET I W A N D A "' :-r::~ [7 ~<.-~.~~ -~ r~ ozri:--+-~1. 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CB CITY SD 54" RCP CITY SD SAN SAVAINE CHANNEL Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-20 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-21 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): Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-22 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-23 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. Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-24 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”: Yes 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. □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ □ ~ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-25 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. Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-26 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-27 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-28 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). Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-29 Form 4.3-3 Infiltration LID BMP –Inf.Basin 1 Remaining LID DCV not met by site design HSC BMP (ft3): 32,406 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 DA-1 BMP Type Inf. Inf Chamber System DA-1 BMP Type Ex. Drywell 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 3 4 Design percolation rate (in/hr)Pdesign = Item 2 / Item 3 4.3 4.3 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 17.2 ft 7 Ponding Depth (ft)dBMP = Minimum of (1/12*Item 4*Item 5) or Item 6 5.5 ft 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 5,162.5 sq-ft 624 sq-ft 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 0.5 ft 12 ft 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))] 0 0 15 Underground Retention Volume (ft3)Volume determined using manufacturer’s specifications and calculations 22,180 ft3 10,731 ft3 16 Total Retention Volume from LID Infiltration BMPs: 32,911 ft3 (Sum of Items 14 and 15 for all infiltration BMP included in plan) 17 Fraction of DCV achieved with infiltration BMP: 101.5 %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. - - I I ■ ■ ■ ■ PROJECT SUMMARY CALCULATION DETAILS • LOADING = HS20/HS25 • APPROX. LINEAR FOOTAGE = 700 LF STORAGE SUMMARY • STORAGE VOLUME REQUIRED = N/A • PIPE STORAGE VOLUME= 13,735 CF • BACKFILL STORAGE VOLUME= 8,445 CF • TOTAL STORAGE PROVIDED= 22,180 CF PIPE DETAILS • DIAMETER = 60" • CORRUGATION = 5x1 •GAGE=16 • COATING = ALT2 • WALL TYPE = PERFORATED • BARREL SPACING = 30" BACKFILL DETAILS • WIDTH AT ENDS= 12" •ABOVE PIPE= 12" • WIDTH AT SIDES= 12" • BELOW PIPE = 9" NOTES • ALL RISER AND STUB DIMENSIONS ARE TO CENTERLINE. ALL ELEVATIONS, DIMENSIONS, AND LOCATIONS OF RISERS AND INLETS, SHALL BE VERIFIED BY THE ENGINEER OF RECORD PRIOR TO RELEASING FOR FABRICATION. • ALL FITTINGS AND REINFORCEMENT COMPLY WITH ASTMA998. • ALL RISERS AND STUBS ARE 223"" x .12°' CORRUGATION AND 16 GAGE UNLESS OTHERWISE NOTED. • RISERS TO BE FIELD TRIMMED TO GRADE. • QUANTITY OF PIPE SHOWN DOES NOT PROVIDE EXTRA PIPE FOR CONNECTING THE SYSTEM TO EXISTING PIPE OR DRAINAGE STRUCTURES. OUR SYSTEM AS DETAILED PROVIDES NOMINAL INLET AND/OR OUTLET PIPE STUB FOR CONNECTION TO EXISTING DRAINAGE FACILITIES. IF ADDITIONAL PIPE IS NEEDED IT IS THE RESPONSIBILITY OF THE CONTRACTOR. • BAND TYPE TO BE DETERMINED UPON FINAL DESIGN. • THE PROJECT SUMMARY IS REFLECTIVE OF THE DYODS DESIGN, QUANTITIES ARE APPROX. AND SHOULD BE VERIFIED UPON FINAL DESIGN AND APPROVAL. FOR EXAMPLE, TOTAL EXCAVATION DOES NOT CONSIDER ALL VARIABLES SUCH AS SHORING AND ONLY ACCOUNTS FOR MATERIAL WITHIN THE ESTIMATED EXCAVATION FOOTPRINT. • THESE DRAWINGS ARE FOR CONCEPTUAL PURPOSES AND DO NOT REFLECT ANY LOCAL PREFERENCES OR REGULATIONS. PLEASE CONTACT YOUR LOCAL CONTECH REP FOR MODIFICATIONS. The design and informationshownonthisdrawingisprovided as a service to the project owner, engineer and contractor by Conlech Engineered Solutions LLC ("Contech"). Neither this drawing, nor any part thereof, may be used, reproduced or modified in any manner without the prior written consent of Contech. Failure to comply is done at the user's own risk and Contech expressly disdaims any liability or responsibility for suchuse. If discrepancies between the supplied information upon which the drawing is based and actual field conditions are encountered as site work progresses, these discrepancies must be reported to Contech immediately for re-evaluation of the design. Contech accepts no liability for designs based on missing, incomplete or DATE inaccurate information suoolied bv others. REVISION DESCRIPTION BY r- <,> ;:.. N r 173'-0" / ( _L__~-~--------~~--------~--------~---------~--------~-------~-----------{ C ~1~NTECH® A~l~ .. IT~AU® ~i,-~~~ri i ~"'" ENGINEERED SOLUTIONS LLC CMP DETENTION SYSTEMS www.ContechES.com CONTECH I 9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069 DYODS 800-338-1122 513-645-7000 513-645-7993 FAX DRAWING ASSEMBLY SCALE: 1" = 20' DYO32851 Conca, Fontana Ret/lnf Chamber-1 Fontana, CA DETENTION SYSTEM PROJECT No.: SEQ. No.: DATE: 22258 32851 6/1312023 DESIGNED: DRAWN: DYO DYO CHECKED: APPROVED: DYO DYO SHEET NO.: 1 DRYWELL PIT CAPACITY CALCULATION EXISTING DRYWELL: 5' DIAMETER, 12' OF DEPTH. (TYP. OF 3) DRYWELL BOTTOM SURFACE AREA: 3.14 [(5'x5')/4] = 19.6 SF DRYWELL PERIMETER SURFACE AREA: 3.14 (5'x12') = 188.4 SF TOTAL INFILTRATION SURFACE AREA: 208 SF SOIL INF. RATE: 12.96"/HR FACTOR OF SAFETY: 3 DESIGN INF. RATE: 4.3"/HR INFILTRATION CAPACITY OF EACH DRYWELL FOR 48-HR DRAWDOWN TIME: 208 x (4.3/12) x 48 = 3,577.6 CF COMBINED INF. CAPACITY OF 3-DRYWELLS: 10731.0 CF TECHNICAL GUIDANCE DOCUMENT APPENDICES Worksheet H: Factor of Safety and Design Infiltration Rate and Worksheet Assigned Factor Product (p) Factor Category Factor Description Weight (w) Value (v) p=wxv Soil assessment methods 0.25 Predominant soil texture 0.25 A Suitability Site soil variability 0.25 Assessment Depth to groundwater/ impervious layer 0.25 Suitability Assessment Safety Factor, SA= LP Tributary area size 0.25 Level of pretreatmenU expected 0.25 sediment loads B Design Redundancy 0.25 Compaction during construction 0.25 Design Safety Factor, S8 = LP Combined Safety Factor, SrnT= SAx Ss Measured Infiltration Rate, inch/hr, KM (corrected for test-specific bias) Design Infiltration Rate , in/hr, KoESIGN = SrnT x KM Supporting Data Briefly describe infiltration test and provide reference to test forms: Note: The minimum combined adjustment factor shall not be less than 2.0 and the maximum combined adjustment factor shall not exceed 9.0. VII-35 May l9,2011 3 1 1 1 0.75 0.25 0.25 0.25 1.50 2 2 3 1 0.50 0.50 0.75 0.25 2.00 3.00 12.96 4.3/ Average Inf. Rate : 12.96 in/hr from USDA WebSoil Report Design Inf Rate: 12.96/3.0 = 4.3"/hr 5/20/23, 12:33 PM Web Soil Sul"\€y Contact Us I Subscribe L\1 Archived Soil Surveys Soil Survey Status Glossary I Preferences I Link Logout I Help IAIAIAI Area of Interest (AO!) Soil Map Soil Data Explorer Download Soils Data Shopping Cart (Free) I Search Map Unit Legend San Bernardino County Southwestern Part, California (CA677) San Bernardino County Southwestern Part, California (CA677) Map Unit Symbol TuB Map Unit Name Tujunga loamy sand, 0 to 5 percent slopes TvC Tujunga gravelly loamy sand, 0 to 9 percent slopes Totals for Area of Interest Acres inAOI 4.2 Percent of AOI 53.5% 3.6 46.5% 7.8 100.0% Printable Version ! Add to Shopping Cart ! Soil Map Jfl You have zoomed in beyond the scale at which the soil map for this area is intended to be used. Mapping of soils is done at a particular scale . The soil surveys that comprise your AO! were mapped at 1:24,000. The design of map units and the level of detail shown in the resulting soil map are dependent on that map scale . Enlargement of maps beyond the scale of mapping can cause rrisunderstanding 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. FOIA I Accessibility Statement I Privacy Policy I Non-Discrimination Statement I Information Quality I USA .gov I White House https :/tv.ebsoilsurwynrcs .usda.g<:J-Jlapp/WebScilSurwyaspx 1/1 Map Unit Description: Tujunga loamy sand, Oto 5 percent slopes-San Bernardino County Southwestern Part, California ii San Bernardino County Southwestern Part, California TuB-Tujunga loamy sand, 0 to 5 percent slopes Natural Resources Conservation Service Map Unit Setting National map unit symbol: 2sx6y Elevation: 650 to 3,110 feet Mean annual precipitation: 10 to 25 inches Mean annual air temperature: 62 to 65 degrees F Frost-free period: 325 to 365 days Farmland classification: Farmland of statewide importance Map Unit Composition Tujunga, loamy sand, and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Tujunga, Loamy Sand Setting Landform: Alluvial fans Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Parent material: Alluvium derived from granite Typical profile A -0 to 6 inches: loamy sand C1 -6 to 18 inches: loamy sand C2 -18 to 60 inches: loamy sand Properties and qualities Slope: 0 to 5 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 4.2 inches} Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soi/ Group: A Ecological site: R019XG912CA-Sandy Fan Hydric soil rating: No Web Soil Survey National Cooperative Soil Survey 5/20/2023 Page 1 of 2 AVG. 12.96"/HR Map Unit Description: Tujunga loamy sand, Oto 5 percent slopes-San Bernardino County Southwestern Part, California ii Minor Components Tujunga, gravelly loamy sand Percent of map unit: 10 percent Landform: Alluvial fans Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Hydric soil rating: No Hanford, sandy loam Percent of map unit: 5 percent Landform: Alluvial fans Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Hydric soil rating: No Data Source Information Soil Survey Area: San Bernardino County Southwestern Part, California Survey Area Data: Version 14, Sep 6, 2022 Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5/20/2023 Page 2 of 2 Map Unit Description: Tujunga gravelly loamy sand, Oto 9 percent slopes--San Bernardino County Southwestern Part, California ii San Bernardino County Southwestern Part, California TvC-Tujunga gravelly loamy sand, 0 to 9 percent slopes Natural Resources Conservation Service 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 Soi/ Group: A Ecological site: R019XG912CA-Sandy Fan Hydric soil rating: No Web Soil Survey National Cooperative Soil Survey 5/20/2023 Page 1 of 2 AVG. 12.96"/HR Map Unit Description: Tujunga gravelly loamy sand, Oto 9 percent slopes--San Bernardino County Southwestern Part, California ii 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 14, Sep 6, 2022 Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5/20/2023 Page 2 of 2 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-30 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 – Not used 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. □ □ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-31 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 - Not used 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): 0 Form 4.3-6 Item 15 + Form 4.3-7 Item 13 Full DCV achieved by using Retention/Infiltration BMPs. Volume based Biotreatment BMPs not used in this project. 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. □ □ □ □ □ □ □ □ ................................................................................................................................................................................................................................ □ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-32 Form 4.3-6 Volume Based Biotreatment– Not used 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-33 Form 4.3-7 Volume Based Biotreatment– Not used 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) Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-34 Form 4.3-8 Flow Based Biotreatment - Not used 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-35 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 DA-1 (ft3): 32,406 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): 32,911 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 ~ □ □ □ □ □ □ □ Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-36 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 I □ - □ □ □ □ □ □ □ □ □ I Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 4-37 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). Conco Industrial Site, Fontana 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. Form 5-1 BMP Inspection and Maintenance (use additional forms as necessary) BMP Reponsible Party(s)Inspection/ Maintenance Activities Required Minimum Frequency of Activities Infiltration Chamber System (Contech Inf Chamber System) and Drywell System Education of Property Owners, Tenants and Occupants on Stormwater BMPs (N1) The Conco Companies The Conco Companies Inspect Contech CMPs through the access/inspection manholes 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” Inspect two-stage pits system for any accomulated sediments, debris. JetVac maintenenace is recommended if sediment accumulation depth exceed 3” 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. Immidiately after construction Thereafter Bi-annual inspection At Property sale/transfer/rent Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 5-2 Landscape maintenance (N3) Spill contingency plan (N7) Litter debris control program (N11) Employee training (N12) Catch basin inspection program (N14) Provide storm drain system stencilling and signage (S1) . The Conco Companies The Conco Companies The Conco Companies The Conco Companies The Conco Companies The Conco Companies All inlet will have visual inspection and cleaning of any Debris The spill kit will be inspected for expiration of materials and replaced as needed and afteruse. Litter debris will be cleared and inspected by the Landscaping contractor assigned by the owner Employee training will be developed by the Owner Catch basins will be inspected a minimum of once every three months during the dry season and a minimum of once every two months during the rainy season. Signs will be placed above storm drain inlets to warn the public of prohibitions against waste disposal. Maintain the legibility of stencilling and signage. . Monthly Annually and after use By weekly Within three months of hire, annually then after. Inspect once a year Annually Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 5-3 Use efficient irrigation systems & landscape design, water conservation, smart controllers, and source control (S4) Street sweeping and Vaccuming (N15) Maintenance Bay Inspection (S8) The Conco Companies The Conco Companies . The Conco Companies Rain sensors will be incorporated into the onsite sprinkler system so that no unnecessary watering of landscaped areas occurs after storm events. Maintenance include the functionality of water sensors, programmable irrigation times, rain-triggered shutoff devices. Vaccum sweeping for parking lot and yard area will be done by the owner. Clear debris/trash and dispose off overflow containment Bi-monthly by the landscape contractor Bi Monthly Weekly Conco Industrial Site, Fontana 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 Conco Industrial Site, Fontana Water Quality Management Plan (WQMP) 6-5 Section 6 WQMP Certification 6.1 Certification “This Water Quality Management Plan has been prepared for The Conco Companies, 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 No. 2021-00043, City of Fontana. 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.” The Conco Companies By:The Conco Companies By: _______________________ Date: ___________ Name: Barry Silberman Applicant Telephone Number: (925) 685-6799 Conco Industrial Site, Fontana 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 The Conco Companies By: _______________________ Date: ___________ Name: Barry Silberman 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 RECORDING REQUESTED BY: CITY OF FONTANA ENGINEERING DEPARTMENT 8353 SIERRA AVENUE, FONTANA CA 92335 SPACE ABOVE FOR RECORDER'S USE ONLY Memorandum of Agreement for Water Quality Management Plan and Storm Water BMP Transfer. Access and Maintenance OWNER/ APPLICANT NAME: PROPERTY ADDRESS: APN: THIS Memorandum of Agreement hereinafter referred to as "Agreement" is made and entered on this ____ day of ________ _, __________ by the undersigned herein after referred to as "Owner" and the City of Fontana, a municipal corporation, located in the County of San Bernardino, State of California hereinafter referred to as "CITY"; WHEREAS, the Owner owns real property ("Property") in the City of Fontana, County of San Bernardino, State of California, more specifically described in Exhibit "A" and depicted in Exhibit "B", each of which exhibits is attached hereto and incorporated herein by this reference; WHEREAS, at the time of initial approval of development project within the Property described above, the City required the project to employ Best Management Practices, hereinafter referred to as "BMPs," to minimize pollutants in urban runoff; WHEREAS, the Owner has chosen to install and/or implement BMPs as described in the Water Quality Management Plan as described in Exhibit "C" and on file with the City, hereinafter referred to as "WQMP", to minimize pollutants in urban runoff and to minimize other adverse impacts of urban runoff; WHEREAS, said WQMP has been certified by the Owner and reviewed and approved by the City; WHEREAS, said BMPs, with installation and/or implementation on private property and draining only private property, are part of a private facility with all maintenance or replacement, therefore, the sole responsibility of the Owner; WHEREAS, the Owner is aware that periodic and continuous maintenance, including, but not necessarily limited to, filter material replacement and sediment removal, is required to assure peak performance of all BMPs in the WQMP and that, furthermore, such maintenance activity will require compliance with all Local, State, or Federal laws and regulations, including those pertaining to confined space and waste disposal methods, in effect at the time such maintenance occurs; Page 1 of 7 NOW THEREFORE, it is hereby agreed by the Owner as follows: 1. Owner hereby provides the City of City's designee complete access, of any duration, to the BMPs and their immediate vicinity at any time, upon reasonable notice, or in the event of emergency, as determined by City's Director of Public Works no advance notice, for the purpose of inspection, sampling, testing of the Device, and in case of emergency, to undertake all necessary repairs or other preventative measures at owner's expense as provided in paragraph 3 below. City shall make every effort at all times to minimize or avoid interference with Owner's use of the Property. 2. Owner shall use its best efforts diligently to maintain all BMPs in a manner assuring peak performance at all times. All reasonable precautions shall be exercised by Owner and Owner's representative or contractor in the removal and extraction of any material(s) from the BMPs and the ultimate disposal of the material(s) in a manner consistent with all relevant laws and regulations in effect at the time. As may be requested from time to time by the City, the Owner shall provide the City with documentation identifying the material(s) removed, the quantity, and disposal destination. 3. In the event Owner, or its successors or assigns, fails to accomplish the necessary maintenance contemplated by this Agreement, within five (5) days of being given written notice by the City, the City is hereby authorized to cause any maintenance necessary to be done and charge the entire cost and expense to the Owner or Owner's successors or assigns, including administrative costs, attorneys fees and interest thereon at the maximum rate authorized by the Civil Code from the date of the notice of expense until paid in full. 4. the Owner agrees to hold the City, its officials, officers, employees, volunteers, and agents free and harmless from any and all claims, demands, causes of action, costs, expenses, liability, loss, damage, or injury, in law or equity, to property or persons, arising from the imposition of the plan by the City; 5. The City may require the owner to post security in form and for a time period satisfactory to the city to guarantee the performance of the obligations state herein. Should the Owner fail to perform the obligations under the Agreement, the City may, in the case of a cash bond, act for the Owner using the proceeds from it, or in the case of a surety bond, require the sureties to perform the obligations of the Agreement. As an additional remedy, the Director may withdraw any previous storm water-related approval with respect to the property on which BMPs have been installed and/or implemented until such time as Owner repays to City its reasonable costs incurred in accordance with paragraph 3 above. 6. This agreement shall be recorded in the Office of the Recorder of San Bernardino County, California, at the expense of the Owner and shall constitute notice to all successors and assigns of the title to said Property of the obligation herein set forth, and also a lien in such amount as will fully reimburse the City, including interest as herein above set forth, subject to foreclosure in event of default in payment. 7. In event of legal action occasioned by any default or action of the Owner, or its successors or assigns, then the Owner and its successors or assigns agree(s) to pay all costs incurred by the City in enforcing the terms of this Agreement, including reasonable attorney's fees and costs, and that the same shall become a part of the lien against said Property. Page 2 of 7 8. It is the intent of the parties hereto that burdens and benefits herein undertaken shall constitute covenants that run with said Property and constitute a lien there against. 9. The obligations herein undertaken shall be binding upon the heirs, successors, executors, administrators and assigns of the parties hereto. The term "Owner" shall include not only the present Owner, but also its heirs, successors, executors, administrators, and assigns. Owner shall notify any successor to title of all or part of the Property about the existence of this Agreement. Owner shall provide such notice prior to such successor obtaining an interest in all or part of the Property. Owner shall provide a copy of such notice to the City at the same time such notice is provided to the successor. 10. This Agreement shall not be amended, modified or terminated without the prior written consent of the City, which consent to be effective, shall be contained in a document executed by the City and recorded against the Real Property. OWNER: Owner/Applicant Name: Owner/ Applicant Signature: Date: NOTARY Notary acknowledgement is required for recordation (attach appropriate acknowledgement). Page 3 of 7 (INSERT NOTARY ACKNOWLEDGEMENT PAGE HERE) Page 4 of 7 EXHIBIT A (Legal Description) Page 5 of 7 EXHIBIT B (Map/illustration) Page 6 of 7 EXHIBIT C WQMP Exhibit Page 7 of 7 Civil Engineering - Land Surveying - Land Planning 16866 Seville Avenue Fontana, California 92335 ALLARD ENGINEERING Prepared By: PHONE (909) 356-1815 Fax (909) 356-1795 ea DMAs AREA (AC)BMP I' I II I II I II I 1\ I ,, ♦ h ,' I I 11 I t;; I ,,, ~I 1 1 ~ :3 I II I tJ 11 I I ,,,, I ) I I I I I I ,I I , . ~ , I I BMP LIST: G) EDUCATION OF PROPERTY OWNERS 0 ACTIVITY RESTRICTIONS EXISTING ROCK DRYWELL SYSTEM-1,2,J 5•,. 12' ROCK CHAMBER DEPTH 16 SYSTEM CAPACITY: J,577 CF EACH 10 ( 48 DRA IIDOWN TIME) (FF=937.5) @ TRASH STORAGE AREAS (SD-32) @RET/INF CHAMBER SYSTEM-1 (CONTECH CMP 5'D/A PIPE) 0 SPILL CONTINGENCY @DETENTION CHAMBE~ SYSTEM-2 © TRAIN/NG/EDUCATION PROGRAM (CONTECH CMP 4-5 DIA PIPES) (';\ DRIVEWAY/PARK/NG LOT VACUUM SWEEPING @EXISTING DRYWELL SYSTEM (TYP. OF J) \.V (5'D/A, 12'D GRAVEL PITS) 0 CATCH BASIN INSPECTION 0 LANDSCAPE PLANNING (SD-1O) ® ROOF RUNOFF CONTROLS (SD-11) CD EFFICIENT /RR/GA/ON (SD-12) @) STORM DRAIN S/GNAGE (SD-13) ® INLET TRASH RACK WQMP EXHIBIT BMP ST A TISTICS: DA-1 7.8 BLPG. 1 I 107,670 S.F. REQUIRED VOLUME (CF) RETENTION/INFILTRATION CHAMBER-1 EX. DRY\1£ll SYSTEM 32,406 (TYP. Of J) TOTAL MITIGATION PROVIDED: PROVIDED VOLUME (CF) 22,180 10,731 er J2,911 er DCV ACHEIVED MTH PROPOSED BMPs: 101.5% □ ' I I ~' I I I ~ PREPARED FOR: THE CONGO COMPANIE~ 13052 DAHLIA STREET FONTANA, CA 92337 PH: (925) 685-6799 Filename: I: \Conco Componies\DWG\ENTITLEMENT\EXHIBITS\WQMP EXHIBIT.dwg Soil Information 5/20/23, 12:33 PM Web Soil Sul"\€y Contact Us I Subscribe L\1 Archived Soil Surveys Soil Survey Status Glossary I Preferences I Link Logout I Help IAIAIAI Area of Interest (AO!) Soil Map Soil Data Explorer Download Soils Data Shopping Cart (Free) I Search Map Unit Legend San Bernardino County Southwestern Part, California (CA677) San Bernardino County Southwestern Part, California (CA677) Map Unit Symbol TuB Map Unit Name Tujunga loamy sand, 0 to 5 percent slopes TvC Tujunga gravelly loamy sand, 0 to 9 percent slopes Totals for Area of Interest Acres inAOI 4.2 Percent of AOI 53.5% 3.6 46.5% 7.8 100.0% Printable Version ! Add to Shopping Cart ! Soil Map Jfl You have zoomed in beyond the scale at which the soil map for this area is intended to be used. Mapping of soils is done at a particular scale . The soil surveys that comprise your AO! were mapped at 1:24,000. The design of map units and the level of detail shown in the resulting soil map are dependent on that map scale . Enlargement of maps beyond the scale of mapping can cause rrisunderstanding 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. FOIA I Accessibility Statement I Privacy Policy I Non-Discrimination Statement I Information Quality I USA .gov I White House https :/tv.ebsoilsurwynrcs .usda.g<:J-Jlapp/WebScilSurwyaspx 1/1 Map Unit Description: Tujunga gravelly loamy sand, Oto 9 percent slopes--San Bernardino County Southwestern Part, California ii San Bernardino County Southwestern Part, California TvC-Tujunga gravelly loamy sand, 0 to 9 percent slopes Natural Resources Conservation Service 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 Soi/ Group: A Ecological site: R019XG912CA-Sandy Fan Hydric soil rating: No Web Soil Survey National Cooperative Soil Survey 5/20/2023 Page 1 of 2 Map Unit Description: Tujunga gravelly loamy sand, Oto 9 percent slopes--San Bernardino County Southwestern Part, California ii 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 14, Sep 6, 2022 Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5/20/2023 Page 2 of 2 Map Unit Description: Tujunga loamy sand, Oto 5 percent slopes-San Bernardino County Southwestern Part, California ii San Bernardino County Southwestern Part, California TuB-Tujunga loamy sand, 0 to 5 percent slopes Natural Resources Conservation Service Map Unit Setting National map unit symbol: 2sx6y Elevation: 650 to 3,110 feet Mean annual precipitation: 10 to 25 inches Mean annual air temperature: 62 to 65 degrees F Frost-free period: 325 to 365 days Farmland classification: Farmland of statewide importance Map Unit Composition Tujunga, loamy sand, and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Tujunga, Loamy Sand Setting Landform: Alluvial fans Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Parent material: Alluvium derived from granite Typical profile A -0 to 6 inches: loamy sand C1 -6 to 18 inches: loamy sand C2 -18 to 60 inches: loamy sand Properties and qualities Slope: 0 to 5 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 4.2 inches} Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soi/ Group: A Ecological site: R019XG912CA-Sandy Fan Hydric soil rating: No Web Soil Survey National Cooperative Soil Survey 5/20/2023 Page 1 of 2 Map Unit Description: Tujunga loamy sand, Oto 5 percent slopes-San Bernardino County Southwestern Part, California ii Minor Components Tujunga, gravelly loamy sand Percent of map unit: 10 percent Landform: Alluvial fans Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Hydric soil rating: No Hanford, sandy loam Percent of map unit: 5 percent Landform: Alluvial fans Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Hydric soil rating: No Data Source Information Soil Survey Area: San Bernardino County Southwestern Part, California Survey Area Data: Version 14, Sep 6, 2022 Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5/20/2023 Page 2 of 2 Educational Material 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 Pick up after your poocll to curb pollution. Maybe you wernn't aware] but dog waste left on the ground gets into storm dra l ns, po II utin g rivers , la kes and beaches. Th e bac ter ia and risk of diseas e thre aten s the hea lth of our kids and comm un iti es . Wherever you live in Sa n Bernardino County , th is pollut ion is a problem . The answer? Pick up after your dog , to help pre vent pollution and protect ou r heal th. l:t's i:n your hands. O Print ed Oil re cyc led pap er 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 Pollution Pliiiiition PAINTING Water-Based Paints Use water-based paints whenever possible . They are less toxic tha n oil-based paints and easier to clean up. Look for products labeled "latex" or '\:leans with water." Paints , solvents , adhesives and other tox ic chemicals used in painting often make their way into the San Bernardino County storm drain system and do not get treated before reaching the Santa Ana River. This pollutes our drinking water and contaminates waterways, making them unsafe for people and wildlife. Follow these si mple tips to prevent pollution and protect our health. Paint Removal Sweep up paint stripping re sid ue , chips and dust instead of hosing into the street and dispose of them safely at a household hazardous waste collection facility. Call [BOO) CLEANUP for the facility in your area. Exterior Paint Removal When stripping or cleaning building exteriors with high- press ure water, block nearby storm drains and divert washwater onto a designated dirt area . Ask your local wastewater treatment authority if you can collect building cleanin g water and discharge it to the sewer . Painting Cleanup Never clean brushes or rinse paint con ta iner s in the stree~ gutter or near a storm drain . Clean water- based paints in the sink. Clean oil-based paints with thinner, which can be reused by putting it in a jar to settle out the paint particles and then pouring of f the clear liq uid for future use. Wrap dried paint residu e in newspaper and dispose of it in the trash. Recycling Paint Re cycle leftover pa int at a household hazardous waste collection facility, save it for to uch ups or give it to someone who can use i~ like a theatre group, school, city or com munity organization . To report illegal dumping or for more information on stormwater pollution prevention, call: 1 (800) CLEANUP www.1800cleanup.org 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 Pollution Piiiiiition HOME REPAIR & REMODELING Constructio n Projects Keep construction debris away from the street, gutter and storm drains. Schedule grading and excavation projects for dry weather. Cover excavated materia l and stockpi les of soi l, sand or gravel, protected from rain, wind and runoff . Prevent erosion by planting fast-growing annua l and perennial grass, which can shield and bind so il. Recyc le Household Hazardous Waste Household cleaners, paint and other home improvement products like wallpaper and tile adhesives are too toxic to trash . Recycle them instead , at a convenient household hazardous waste collection facility. Call [800] CLEANUP for the facility in your area . Paints, solvents, adhesives and other toxic substances used in home repair and remodeling often make their way into the San Bernardino County storm drain system and do not gel treated before reaching the Santa Ana River. This pollutes our drinking water and contaminates waterways, mak in g them unsafe for people and wildlife. Follow these simp le lips to prevent pollut ion and protect your health . Landscap ing & Gardenin g Avoid apply ing fertilizers or pesticide near curbs and driveways , and store covered, protected from rain , wind and runoff. Try using organic or non- toxic alternat ives. Reduce runo ff and lower your water bill by using drip irrigation, soaker hoses or micro-spray systems. Recycle leaves instead of blowing, sweeping or raking them into the street, gutter or storm drain. Paint Removal Pa int stripping residue, chips and dust from marine paints and paints containing lead or lributy l tin are hazardous wastes. Sweep them up instead of hosing into the street and disp ose of them safely at a household hazardo us waste collection facility. Painting Cleanup Avoid cleaning brushes or rin si ng paint containers in the street, gutter or near a storm drain. Clean water-based paints in the sink . Clean oi l-based paints with thinner, wh ich you can filter and reuse . Recycle leftover paint at a household hazardous waste collection facility, save it for touch ups or give it to someone who can use it, like a theatre group , school , city or commun ity organ ization. Conc rete and Masonry Store bags of cement and plaster away from gutters and storm drains, and cover them to protect against rain, wind and runoff. Sweep or scoop up cement washo ut or concrete dust instead of hosing into driveways , streets , gutters or storm drains. To report llegal dumping or for more information on storm water po ll ution prevention , call : (800) CLEANUP www.1 80 0c lea nu p.o rg 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 Pollution Piiiiiition HOME & GARDEN Recycle Household Hazardous Waste Household products like pain~ pesticides, solvents and cleaners are too dangerous to dump and too toxic to tra sh. Take them to be re cycled at a convenient household hazardous waste collection facility. Call [800) CLEANUP for the facility in your area. Yard waste and household tox ics like paints and pesticides often make their way into the San Bernardino County storm drain system and do not get treated before reach ing the San ta Ana River. This pollutes ou r drin ki ng water and contaminates waterways , making them unsafe for people and wildlife. Follow these simple tips to prevent pollution and protect your health. Disposing of Yard Waste Recyc le leaves, grass clippings and other yard waste, in stead of blowing , sweeping or hosing into the street. Try grasscycl ing , leaving grass clippings on your lawn instead of using a grass catcher. The cl ipp ing s act as a natura l ferti lize r, and beca use grass is mostly water, it also irrigates your lawn , conse rving water. Planting in the Yard Produce le ss yard waste and save water by planting low maintenance , drought-tole ran t trees and shrubs . Using drip irriga ti on , soaker hoses or micro -sp ray systems for flow er beds and vegetation can also help re duce your water bill and preve nt runoff . Use Fertilizers & Pesticides Safely Fertilizers and pestic ides are often carr ied into the st orm drain system by sp rinkler runoff. Try usin g organi c or no n-tox ic alternatives. If you use chemica l fertilizers or pesticides , avoid applying near curbs and dr iveways and never apply before a rain . Use Water Wisely Cut your water costs and prevent runoff by contr olling the amount of water and direct ion of sprinklers. The average lawn needs about an inch of water a week, including rainfall , or 10 to 20 minutes of watering. A half ~nch per week is enough for fall and spring . Sprinklers should be on long enough to allow water to so ak into the ground but not so long as to cause runoff. To report illegal dumping or for more information on stormwater pollution prevention, call: 1 (800) CLEANUP www.1800cleanup.org 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 I .. er 11zer reven Water that runs off your lawn and garden can carry excess fert iliz er into the San Bernardino County storm drain system, and it does not get treated before reaching the Santa Ana River. This pollutes our drinking water and contaminates waterways, making them unsafe for people and wildlife. Follow these simple tips to prevent pollution and protect your health: • Read the product label and follow the directiions carefully, using onlY as directed. • Avoid appJying near driveways or gutters. • Never apply fertilizer before a rain. • Store fertilizers and chemicals in a covered area and in sealed, waterproof containers. • Take unwanted lawn or garden chemicals to a household hazardous waste collection facility. Call (800) .253-2687. • Use non-toxic products for your garden and lawn whenever possible. To rnport illegal dumping or for more information on Stormwater po :11ution prevention , call: ..-----c-------. 1· (800) CLEANUP www.1800cleanup.org 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 Pollution Piiiiiiition FRESH CONCRETE & MORTAR APPLICATION Cement wash , sediment, vehicle fluids , dust and hazardous debris from construction sites often make their way into the San Bernardino County stonm drain system and do not get treated before reaching the Santa Ana River. This pollutes our drinking water and contaminates waterways, making them unsafe for people and wildlife. Follow these best management practices to prevent pollution and protect public health . Storing Materials Keep construction materials and debris away from the street gutter and storm drains. Secure open bags of cement and cover exposed stockpiles of soil, sand or gravel and excavated material with plastic sheeting, protected from rain, wind and runoff. Onlering Materials & Recycling Waste Reduce waste by ordering only the amounts of materials needed for the job. Use recycled or recyclable materials whenever possible. When breaking up paving, recycle the pieces at a crushing company. You can also recycle broken asphalt concrete, wood, and cleared vegetation. Non-recyclable materials should be taken to a landfill or disposed of as hazardous waste. Call (909) 386-1l4m for recycling and disposal information. Cleaning Up Wash concrete dust onto designated dirt areas, not down driveways or into the street or storm drains. ~sh out concrete mixers and equipment in specified washout areas, where water can flow into a containment pond . Cement washwater can be recycled by pumping it back into cement mixers for reuse . Never dispose of cement washout into driveways, streets , gutters, storm drains or drainage ditches . During Construction Schedule excavation and grading during dry weather. Prevent mortar and cement from entering the street and storm drains by placing erosion controls. Setup small mixers on tarps or drop cloths, for easy cleanup of debris. Never bury waste material. Recycle or dispose of it as hazardous waste. To report illega l dumping or for more information on stormwater pollution prevention , call: 1 (800) CLEANUP www.1800cleanup.org 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 Pollution Pliiiiition AUTO MAINTENANCE Oil, grease , anti-freeze and other toxic automotive fluids often make thei r way int o the San Bernard ino County storm drain system, and do not get treated before reaching the Santa Ana River. This pollutes our drinking water and contaminates waterways, making them unsafe for people and wildlife . Follow these best management practices to prevent pollution and protect public health. Cleaning Auto Parts Scrape parts with a wire bru sh or use a bake oven rather than liquid clea ner s. Arrange drip pans, drying racks and drain boards so that fluids are directed back into t he parts washer or t he fluid ho lding tank . Oo not wash parts or equipment in a shop si nk, park ing lot, driveway or street. Storing Hazardous Waste Keep your liquid waste segregated. Many f lu ids can be recyc led via hazardo us waste disposal companies if they are not mixed. Store all ma t eria ls under cover with spil l containment or inside to prevent contamination of rainwa te r runoff. Metal Grinding and Polishing Keep a bin under your lathe or grinder to capture metal filings. Send uncontaminated filings to a scrap metal recycler for reclamation . Store metal fil ings in a covered container or indoors . Cleaning Spills Use dry methods for sp ill clean up [sweeping , absorbent materials]. Follow your hazardous materials response plan , as filed with your local fire department or other hazardous materials authority. Be sure that all employees are aware of the plan and are capable of implementing each phase . To report serious toxic spills, call 911. Preventing Leaks and Spills Place drip pans und erneath to capture fluids . Use absorbent clean ing agents instead of water to clean work areas. Proper Disposal of Hazardous Waste Re cycle used motor oil and oi l filters , anti -freeze and other hazardous automotive fluids, batteri es, tires and metal filings collecte d from grinding or polishing auto parts . Contact a licensed hazardou s waste hauler. For more recycling informatio n, call [909] 386-8401. ■ To report illegal dumping or for more information on stormwater pollution prevention, ca ll : 1 (800) CLEANUP www.1 00c leanup.org BMP Fact Sheets PROJECT SUMMARY CALCULATION DETAILS • LOADING = HS20/HS25 • APPROX. LINEAR FOOTAGE = 700 LF STORAGE SUMMARY • STORAGE VOLUME REQUIRED = N/A • PIPE STORAGE VOLUME= 13,735 CF • BACKFILL STORAGE VOLUME= 8,445 CF • TOTAL STORAGE PROVIDED= 22,180 CF PIPE DETAILS • DIAMETER = 60" • CORRUGATION = 5x1 •GAGE=16 • COATING = ALT2 • WALL TYPE = PERFORATED • BARREL SPACING = 30" BACKFILL DETAILS • WIDTH AT ENDS= 12" •ABOVE PIPE= 12" • WIDTH AT SIDES= 12" • BELOW PIPE = 9" NOTES • ALL RISER AND STUB DIMENSIONS ARE TO CENTERLINE. ALL ELEVATIONS, DIMENSIONS, AND LOCATIONS OF RISERS AND INLETS, SHALL BE VERIFIED BY THE ENGINEER OF RECORD PRIOR TO RELEASING FOR FABRICATION. • ALL FITTINGS AND REINFORCEMENT COMPLY WITH ASTMA998. • ALL RISERS AND STUBS ARE 223"" x .12°' CORRUGATION AND 16 GAGE UNLESS OTHERWISE NOTED. • RISERS TO BE FIELD TRIMMED TO GRADE. • QUANTITY OF PIPE SHOWN DOES NOT PROVIDE EXTRA PIPE FOR CONNECTING THE SYSTEM TO EXISTING PIPE OR DRAINAGE STRUCTURES. OUR SYSTEM AS DETAILED PROVIDES NOMINAL INLET AND/OR OUTLET PIPE STUB FOR CONNECTION TO EXISTING DRAINAGE FACILITIES. IF ADDITIONAL PIPE IS NEEDED IT IS THE RESPONSIBILITY OF THE CONTRACTOR. • BAND TYPE TO BE DETERMINED UPON FINAL DESIGN. • THE PROJECT SUMMARY IS REFLECTIVE OF THE DYODS DESIGN, QUANTITIES ARE APPROX. AND SHOULD BE VERIFIED UPON FINAL DESIGN AND APPROVAL. FOR EXAMPLE, TOTAL EXCAVATION DOES NOT CONSIDER ALL VARIABLES SUCH AS SHORING AND ONLY ACCOUNTS FOR MATERIAL WITHIN THE ESTIMATED EXCAVATION FOOTPRINT. • THESE DRAWINGS ARE FOR CONCEPTUAL PURPOSES AND DO NOT REFLECT ANY LOCAL PREFERENCES OR REGULATIONS. PLEASE CONTACT YOUR LOCAL CONTECH REP FOR MODIFICATIONS. The design and informationshownonthisdrawingisprovided as a service to the project owner, engineer and contractor by Conlech Engineered Solutions LLC ("Contech"). Neither this drawing, nor any part thereof, may be used, reproduced or modified in any manner without the prior written consent of Contech. Failure to comply is done at the user's own risk and Contech expressly disdaims any liability or responsibility for suchuse. If discrepancies between the supplied information upon which the drawing is based and actual field conditions are encountered as site work progresses, these discrepancies must be reported to Contech immediately for re-evaluation of the design. Contech accepts no liability for designs based on missing, incomplete or DATE inaccurate information suoolied bv others. REVISION DESCRIPTION BY r- <,> ;:.. N r 173'-0" / ( _L__~-~--------~~--------~--------~---------~--------~-------~-----------{ C ~1~NTECH® A~l~ .. IT~AU® ~i,-~~~ri i ~"'" ENGINEERED SOLUTIONS LLC CMP DETENTION SYSTEMS www.ContechES.com CONTECH I 9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069 DYODS 800-338-1122 513-645-7000 513-645-7993 FAX DRAWING ASSEMBLY SCALE: 1" = 20' DYO32851 Conca, Fontana Ret/lnf Chamber-1 Fontana, CA DETENTION SYSTEM PROJECT No.: SEQ. No.: DATE: 22258 32851 6/1312023 DESIGNED: DRAWN: DYO DYO CHECKED: APPROVED: DYO DYO SHEET NO.: 1 A A 8 7 6 3 2 2 5 Material Location Infiltration Systems -CMP Infiltration & CMP Perforated Drainage Pipe Description Material Designation Designation 8 7 A Rigid or Flexible Pavement (if applicable) Road Base (if applicable 4 CMP 5 HAUNCH ZONE rn UJ 12 ;l: * Geotextile Layer Backfill 6 Bedding Stone 3 Geotextile Layer Non-Woven Geotextile Infiltration pipe systems have a pipe perforation sized of 3/8" diameter. An open graded, free draining stone, with a particle size of ½" - 2 ½" diameter is recommended. CONTECH C-40 orC-45 MSHTOM 145- A-1 orMSHTO M 43-3, 4 Well graded granular bedding MSHTO M43 - material w/maximum particle 3,357,4,467, 5, size of 3" 56, 57 None None Engineer Decision for consideration to prevent soil migration into varying soil types. Wrap the trench only. Material shall be worked into the pipe haunches by means of shovel-slicing, rodding, air-tamper, vibratory rod, or other effective methods. Compaction of all placed fill material is necessary and shall be considered adequate when no further yielding of the material is observed under the compactor, or under foot, and the Project Engineer or his representative is satisfied with the level of compaction" For soil aggregates larger than 3/8" a dedicated bedding layer is not required for CMP. Pipe may be placed on the trench bottom comprised of native suitable well graded & granular material. For Arch pipes ii is recommended to be shaped to a relatively flat bottom or fine-grade the foundation to a slight v-shape. Soil aggregates less than 3/8" and unsuitable material should be over-excavated and re-placed with a 4"-6" layer of well graded & granular stone per the material designation. Contech does not recommend geotextiles be placed under the invert of lnfilitration systems due to the propensity for geotextiles to clog over time. A * Note: The listed MSHTO designations are for gradation only. The stone must also be angular and clean. INITIAL FILL ENVELOPE---- MINIMUM WIDTH DEPENDS ON SITE CONDITIONS AND ENGINEERING JUDGEMENT. FOUNDATION/BEDDING PREPARATION PRIOR TO PLACING THE BEDDING, THE FOUNDATION MUST BE CONSTRUCTED TO A UNIFORM AND STABLE GRADE. IN THE EVENT THAT UNSUITABLE FOUNDATION MATERIALS ARE ENCOUNTERED DURING EXCAVATION, THEY SHALL BE REMOVED AND BROUGHT BACK TO THE GRADE WITH A FILL MATERIAL AS APPROVED BY THE ENGINEER. HAUNCH ZONE MATERIAL SHALL BE PLACED AND UNIFORMLY COMPACTED WITHOUT SOFT SPOTS. BACKFILL MATERIAL SHALL BE PLACED IN 8"-10" MAXIMUM LIFTS. INADEQUATE COMPACTION CAN LEAD TO EXCESSIVE DEFLECTIONS WITHIN THE SYSTEM AND SETTLEMENT OF THE SOILS OVER THE SYSTEM. BACKFILL SHALL BE PLACED SUCH THAT THERE IS NO MORE THAN A TWO-LIFT DIFFERENTIAL BETWEEN THE SIDES OF ANY PIPE IN THE SYSTEM AT ALL TIMES DURING THE BACKFILL PROCESS. BACKFILL SHALL BE ADVANCED ALONG THE LENGTH OF THE SYSTEM AT THE SAME RATE TO AVOID DIFFERENTIAL LOADING ON ANY PIPES IN THE SYSTEM. EQUIPMENT USED TO PLACE AND COMPACT THE BACKFILL SHALL BE OF A SIZE AND TYPE SO AS NOT TO DISTORT, DAMAGE, OR DISPLACE THE PIPE. ATTENTION MUST BE GIVEN TO PROVIDING ADEQUATE MINIMUM COVER FOR SUCH EQUIPMENT. MAINTAIN BALANCED LOADING ON ALL PIPES IN THE SYSTEM DURING ALL SUCH OPERATIONS. OTHER ALTERNATE BACKFILL MATERIAL MAY BE ALLOWED DEPENDING ON SITE SPECIFIC CONDITIONS. REFER TO TYPICAL BACKFILL DETAIL FOR MATERIAL REQUIRED. ' ' 0 ~ 2 2/3" X 1/2" CORRUGATION -STEEL AND ALUMINUM CMP EDGE SPACING EQUAL ON BOTH SIDES ~-!----' 0 J2.8"- 3" x 1" CORRUGATION - STEEL AND ALUMINUM CMP § COIL WIDTH -------------- 0 PEN AREA= 3.76 SQ IN/SQ FT (COIL PROVIDED FROM N_· __ _ CONTECH LANTANA, FL PLANT} (_) (_) a. 3 ·c'o1L WIDTH OPEN AREA= 4.16 SQ IN/SQ FT 5" x 1" CORRUGATION -STEEL ONLY EDGE SPACING EQUAL ON BOTH SIDES ~~~--- ____j 2.711" NOTES: 9@2.711" = 24.399" COIL WIDTH OPEN AREA= 3.33 SQ IN/SQ FT 1. PERFORATIONS MEET AASHTO AND ASTM SPECIFICATIONS. l I j 2. PERFORATION OPEN AREA PER SQUARE FOOT OF PIPE IS BASED ON THE NOMINAL DIAMETER AND LENGTH OF PIPE. The design and informationshownonthisdrawingisprovided as a service to the project owner, engineer and contractor by Conlech Engineered Solutions LLC ("Contech"). Neither this drawing, nor any part thereof, may be used, reproduced or modified in any manner without the prior written consent of Contech. Failure to comply is done at the user's own risk and Conlech expressly disdaims any liability or responsibility for suchuse. If discrepancies between the supplied information upon which the drawing is based and actual field conditions are encountered as site work progresses, these discrepancies must be reported lo Contech immediately for re-evaluation of the design. Contech accepts no liability for designs based on missing, incomplete or DATE REVISION DESCRIPTION BY inaccurate information suoolied bv others. 3. ALL DIMENSIONS ARE SUBJECT TO MANUFACTURING TOLERANCES. 4. ALL HOLES 03/8". C ~1~NTECH® ~i,- ENGINEERED SOLUTIONS LLC www.ContechES.com 9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069 800-338-1122 513-645-7000 513-645-7993 FAX TYPICAL PERFORATION DETAIL SCALE: N.T.S. A~l~ .. IT~AU® ~~~ri i ~"'" CMP DETENTION SYSTEMS CONTECH I DYODS DRAWING -I FRONT NOTE: -~ PLAN TYPICAL MANWAY DETAIL SCALE: N.T.S. MANWAY DETAIL APPLICABLE FOR CMP SYSTEMS WITH DIAMETERS 48" AND LARGER. MANWAYS MAY BE REQUIRED ON SMALLER SYSTEMS DEPENDING ON ACTUAL SITE SPECIFIC CONDITIONS. RISER (TYP.) SEE DETAIL ELEVATION END NOTE: TYPICAL RISER DETAIL LADDERS ARE OPTIONAL AND ARE NOT REQUIRED FOR ALL SYSTEMS. SCALE: N.T.S. 20 MIL HOPE MEMBRANE LINER OVER TOP OF PIPE (IF REQUIRED) TYPICAL SECTION VIEW LINER OVER ROWS SCALE: N.T.S. NOTE: IF SALTING AGENTS FOR SNOW AND ICE REMOVAL ARE USED ON OR NEAR THE PROJECT, AN HOPE MEMBRANE LINER IS RECOMMENDED WITH THE SYSTEM. THE IMPERMEABLE LINER IS INTENDED TO HELP PROTECT THE SYSTEM FROM THE POTENTIAL ADVERSE EFFECTS THAT MAY RESULT FROM A CHANGE IN THE SURROUNDING ENVIRONMENT OVER A PERIOD OF TIME. PLEASE REFER TO THE CORRUGATED METAL PIPE DETENTION DESIGN GUIDE FOR ADDITIONAL INFORMATION. LIMITS OF REQUIRED BACKFILL VARIES PROJECT No.: SEQ. No.: DATE: DY032851 Conca, Fontana 22258 32851 6/1312023 DESIGNED: DRAWN: Ret/lnf Chamber-1 DYO DYO CHECKED: APPROVED: Fontana, CA DYO DYO DETENTION SYSTEM SHEET NO.: 1 TEMPORARY COVER FOR CONSTRUCTION LOADS HEIGHT FINISHED GRADE OF - COVER 011 11::1 IIL!r 1 -:ll~--I f SCOPE CONSTRUCTION LOADS FOR TEMPORARY CONSTRUCTION VEHICLE LOADS, AN EXTRAAMOUNT OF COMPACTED COVER MAY BE REQUIRED OVER THE TOP OF THE PIPE. THE HEIGHT-OF-COVER SHALL MEET THE MINIMUM REQUIREMENTS SHOWN IN THE TABLE BELOW. THE USE OF HEAVY CONSTRUCTION EQUIPMENT NECESSITATES GREATER PROTECTION FOR THE PIPE THAN FINISHED GRADE COVER MINIMUMS FOR NORMAL HIGHWAY TRAFFIC. PIPE SPAN, AXLE LOADS (kips) INCHES 18-50 I 50-75 I 75-110 1 110-150 MINIMUM COVER (FT) 12-42 2.0 2.5 3.0 3.0 48-72 3.0 3.0 3.5 4.0 78-120 3.0 3.5 4.0 4.0 126-144 3.5 4.0 4.5 4.5 *MINIMUM COVER MAY VARY, DEPENDING ON LOCAL CONDITIONS. THE CONTRACTOR MUST PROVIDE THE ADDITIONAL COVER REQUIRED TO AVOID DAMAGE TO THE PIPE. MINIMUM COVER IS MEASURED FROM THE TOP OF THE PIPE TO THE TOP OF THE MAINTAINED CONSTRUCTION ROADWAY SURFACE. CONSTRUCTION LOADING DIAGRAM SCALE: N.T.S. SPECIFICATION FOR DESIGNED DETENTION SYSTEM: PIPE ----------A------------- ACCESS CASTING TO BE co GASKET MATERIAL SUFFICIENT TO PREVENT SLAB FROM BEARING ON - RISER TO BE PROVIDED BY CONTRACTOR. #4 DIAGONAL TRIM BAR (TYP. 4 PLACES), SEE NOTE 7. t OPENING IN PROTECTION SLAB FOR CASTING " " " PROVIDED AND INSTALLED BY CONTRACTOR. SECTION VIEW -0A N ...J ...J <( 0.: -~ [fl ~o a,_- <( en C9 #4 DIAGONAL TRIM BAR (TYP. 4 PLACES), SEE NOTE 7. 2"COVER (TYP) t THIS SPECIFICATION COVERS THE MANUFACTURE AND INSTALLATION OF THE DESIGNED DETENTION SYSTEM DETAILED IN THE PROJECT PLANS. THE PIPE SHALL BE MANUFACTURED IN ACCORDANCE TO THE APPLICABLE REQUIREMENTS LISTED BELOW: OPENING IN PROTECTION SLAB FOR CASTING MATERIAL THE MATERIAL SHALL CONFORM TO THE APPLICABLE REQUIREMENTS LISTED BELOW: ALUMINIZED TYPE 2 STEEL COILS SHALL CONFORM TO THE REQUIREMENTS OF AASHTO M-274 OR ASTM A-92. THE GALVANIZED STEEL COILS SHALL CONFORM TO THE REQUIREMENTS OF AASHTO M-218 ORASTM A-929. THE POLYMER COATED STEEL COILS SHALL CONFORM TO THE REQUIREMENTS OF AASHTO M-246 ORASTM A-742. ALUMINIZED TYPE 2: AASHTO M-36 ORASTM A-760 GALVANIZED: AASHTO M-36 OR ASTM A-760 ARR!llG'.MllllECOATED: AASHTO M-245 ORASTM A-762 ALUMINUM: AASHTO M-196 ORASTM B-745 APPLICABLE HANDLING AND ASSEMBLY INTERRUPTED BAR REPLACEMENT, SEE NOTE6. STANDARD REINFORCING, SEE TABLE ROUND OPTION PLAN VIEW NOTES: STANDARD REINFORCING, SEE TABLE REINFORCING TABLE 0CMP **BEARING RISER A 0B REINFORCING PRESSURE (PSF) 24" 04• 26" #5@12"0CEW 2,410 4'X4' #5@12"0CEW 1,780 30" 04'-6" 32" #5@12"0CEW 2,120 4'-6" X 4'-6" #5@12"0CEW 1,530 36" 05' 5' 38" #5@10"0CEW 1,890 X5' #5@10"0CEW 1,350 42" 0 5'-6" 5'-6" 44" #5@10"0CEW 1,720 X5'-6" #5@9"0CEW 1,210 48" 06' 6' 50" #5@9"0CEW 1,600 X6' #5@8"0CEW 1,100 ** ASSUMED SOIL BEARING CAPACITY ----------A---------- SQUARE OPTION PLAN VIEW t <( INTERRUPTED BAR REPLACEMENT, SEE NOTE 6. SHALL BE IN ACCORDANCE WITH NCSP'S (NATIONAL CORRUGATED STEEL Afff!el£ASSE>CIATION) FORALUMINIZED TYPE 2, GALVANIZED OR POLYMER COATED STEEL. SHALL BE IN ACCORDANCE WITH THE MANUFACTURER'S RECOMMENDATIONS FOR ALUMINUM PIPE. 1. DESIGN INACCORDANCEWITHAASHTO, 17th EDITION. 7. TRIM OPENING WITH DIAGONAL#4 BARS, EXTEND BARS A MINIMUM OF 12" BEYOND OPENING, BEND BARS AS REQUIRED TO MAINTAIN BAR COVER. THE ALUMINUM COILS SHALL CONFORM TO THE APPLICABLE OF AASHTO M-197 ORASTM B-744. CONSTRUCTION LOADS CONSTRUCTION LOADS MAY BE HIGHER THAN FINAL LOADS. FOLLOW THE MANUFACTURER'S OR NCSPA GUIDELINES. NOTE: THESE DRAWINGS ARE FOR CONCEPTUAL PURPOSES AND DO NOT REFLECT ANY LOCAL PREFERENCES OR REGULATIONS. PLEASE CONTACT YOUR LOCAL CONTECH REP FOR MODIFICATIONS. The design and informationshownonthisdrawingisprovided as a service to the project owner, engineer and contractor by REQUIREMENTS INSTALLATION SHALL BE IN ACCORDANCE WITH AASHTO STANDARD SPECIFICATIONS FOR HIGHWAY BRIDGES, SECTION 26, DIVISION II DIVISION II ORASTM A-798 (FOR ALUMINIZED TYPE 2, GALVANIZED OR POLYMER COATED STEEL) ORASTM B-788 (FOR ALUMINUM PIPE)AND IN CONFORMANCE WITH THE PROJECT PLANS AND SPECIFICATIONS. IF THERE ARE ANY INCONSISTENCIES OR CONFLICTS THE CONTRACTOR SHOULD DISCUSS AND RESOLVE WITH THE SITE ENGINEER. IT IS ALWAYS THE RESPONSIBILITY OF THE CONTRACTOR TO FOLLOW OSHA GUIDELINES FOR SAFE PRACTICES. 2. DESIGN LOAD HS25. 3. EARTH COVER = 1' MAX. 4. CONCRETE STRENGTH = 3,500 psi 5. REINFORCING STEEL= ASTM A615, GRADE 60. 6. PROVIDE ADDITIONAL REINFORCING AROUND OPENINGS EQUAL TO THE BARS INTERRUPTED, HALF EACH SIDE. ADDITIONAL BARS TO BE IN THE SAME PLANE. 8. PROTECTION SLAB AND ALL MATERIALS TO BE PROVIDED AND INSTALLED BY CONTRACTOR. 9. DETAIL DESIGN BY DELTA ENGINEERING, BINGHAMTON, NY. MANHOLE CAP DETAIL SCALE: N.T.S. PROJECT No.: SEQ. No.: DATE: Conlech Engineered Solutions LLC ("Contech"). Neither this C ~1~NTECH® A~l~ .. IT~AU® DYO32851 Conca, Fontana 22258 32851 6/1312023 drawing, nor any part thereof, may be used, reproduced or ~i,-~~~ri i ~"'" modified in any manner without the prior written consent of DESIGNED: DRAWN: Contech. Failure to comply is done at the user's own risk and ENGINEERED SOLUTIONS LLC CMP DETENTION SYSTEMS Ret/lnf Chamber-1 DYO DYO Contech expressly disdaims any liability or responsibility for suchuse. CHECKED: APPROVED: www.ContechES.com Fontana, CA If discrepancies between the supplied information upon which CONTECH I DYO DYO the drawing is based and actual field conditions are encountered 9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069 DYODS as site work progresses, these discrepancies must be reported DETENTION SYSTEM SHEET NO.: lo Contech immediately for re-evaluation of the design. Contech 800-338-1122 513-645-7000 513-645-7993 FAX DRAWING accepts no liability for designs based on missing, incomplete or DATE REVISION DESCRIPTION BY 1 inaccurate information suoolied bv others. CMP DETENTION INSTALLATION GUIDE PROPER INSTALLATION OF A FLEXIBLE UNDERGROUND DETENTION SYSTEM WILL ENSURE LONG-TERM PERFORMANCE. THE CONFIGURATION OF THESE SYSTEMS OFTEN REQUIRES SPECIAL CONSTRUCTION PRACTICES THAT DIFFER FROM CONVENTIONAL FLEXIBLE PIPE CONSTRUCTION. CONTECH ENGINEERED SOLUTIONS STRONGLY SUGGESTS SCHEDULING A PRE-CONSTRUCTION MEETING WITH YOUR LOCAL SALES ENGINEER TO DETERMINE IF ADDITIONAL MEASURES, NOT COVERED IN THIS GUIDE, ARE APPROPRIATE FOR YOUR SITE. FOUNDATION CONSTRUCT A FOUNDATION THAT CAN SUPPORT THE DESIGN LOADING APPLIED BY THE PIPE AND ADJACENT BACKFILL WEIGHT AS WELL AS MAINTAIN ITS INTEGRITY DURING CONSTRUCTION. IF SOFT OR UNSUITABLE SOILS ARE ENCOUNTERED, REMOVE THE POOR DOWN TO A SUITABLE DEPTH AND THEN BUILD UP TO THE APPROPRIATE ELEVATION WITH A COMPETENT BACKFILL MATERIAL. THE STRUCTURAL FILL MATERIAL GRADATION SHOULD NOT ALLOW THE MIGRATION OF FINES, WHICH CAN CAUSE SETTLEMENT OF THE DETENTION SYSTEM OR PAVEMENT ABOVE. IF THE STRUCTURAL FILL MATERIAL IS NOT COMPATIBLE WITH THE UNDERLYING SOILS AN ENGINEERING FABRIC SHOULD BE USED ASA SEPARATOR. IN SOME CASES, USING A STIFF REINFORCING GEOGRID REDUCES OVER EXCAVATION AND REPLACEMENT FILL QUANTITIES. GEOGRID USED TO REDUCE BACKFILL - THE AMOUNT OF UNDERCUT GEOGRID BEDDING -COVER GEOGRID WASN'T USED EMBANKMENT UNDERCUT AND REPLACE UNSUITABLE SOILS GRADE THE FOUNDATION SUBGRADE TO A UNIFORM OR SLIGHTLY SLOPING GRADE. IF THE SUBGRADE IS CLAY OR RELATIVELY NON-POROUS AND THE CONSTRUCTION SEQUENCE WILL LAST FOR AN EXTENDED PERIOD OF TIME, IT IS BEST TO SLOPE THE GRADE TO ONE END OF THE SYSTEM. THIS WILL ALLOW EXCESS WATER TO DRAIN QUICKLY, PREVENTING SATURATION OF THE SUBGRADE. GEOMEMBRANE BARRIER IN-SITU TRENCH WALL IF EXCAVATION IS REQUIRED, THE TRENCH WALL NEEDS TO BE CAPABLE OF SUPPORTING THE LOAD THAT THE PIPE SHEDS AS THE SYSTEM IS LOADED. IF SOILS ARE NOT CAPABLE OF SUPPORTING THESE LOADS, THE PIPE CAN DEFLECT. PERFORM A SIMPLE SOIL PRESSURE CHECK USING THE APPLIED LOADS TO DETERMINE THE LIMITS OF EXCAVATION BEYOND THE SPRING LINE OF THE OUTER MOST PIPES. IN MOST CASES THE REQUIREMENTS FORA SAFE WORK ENVIRONMENT AND PROPER BACKFILL PLACEMENT AND COMPACTION TAKE CARE OF THIS CONCERN. BACKFILL -WELL GRADED -!• GRANULAR AND SMALLER GRANULAR AND SMALLER- BACKFILL PLACEMENT MATERIAL SHALL BE WORKED INTO THE PIPE HAUNCHES BY MEANS OF SHOVEL-SLICING, RODDING, AIR TAMPER, VIBRATORY ROD, OR OTHER EFFECTIVE METHODS. MAXIMUM UNBALANCE LIMITED TO 2 LIFTS (APPROX. 16") IF MSHTO T99 PROCEDURES ARE DETERMINED INFEASIBLE BY THE GEOTECHNICAL ENGINEER OF RECORD, COMPACTION IS CONSIDERED ADEQUATE WHEN NO FURTHER YIELDING OF THE MATERIAL IS OBSERVED UNDER THE COMPACTOR, OR UNDER FOOT, AND THE GEOTECHNICAL ENGINEER OF RECORD (OR REPRESENTATIVE THEREOF) IS SATISFIED WITH THE LEVEL OF COMPACTION. A SITE'S RESISTIVITY MAY CHANGE OVER TIME WHEN VARIOUS TYPES OF SALTING AGENTS ARE USED, SUCH AS ROAD SALTS FOR DEICING AGENTS. IF SALTING AGENTS ARE USED ON OR NEAR THE PROJECT SITE, A GEOMEMBRANE BARRIER IS RECOMMENDED WITH THE SYSTEM. THE GEOMEMBRANE LINER IS INTENDED TO HELP PROTECT THE SYSTEM FROM THE POTENTIAL ADVERSE EFFECTS THAT MAY RESULT FROM THE USE OF SUCH AGENTS INCLUDING PREMATURE CORROSION AND REDUCED ACTUAL SERVICE LIFE. FOR LARGE SYSTEMS, CONVEYOR SYSTEMS, BACKHOES WITH LONG REACHES OR DRAGLINES WITH STONE BUCKETS MAY BE USED TO PLACE BACKFILL. ONCE MINIMUM COVER FOR CONSTRUCTION LOADING ACROSS THE ENTIRE WIDTH OF THE SYSTEM IS REACHED, ADVANCE THE EQUIPMENT TO THE END OF THE RECENTLY PLACED FILL, AND BEGIN THE SEQUENCE AGAIN UNTIL THE SYSTEM IS COMPLETELY BACKFILLED. THIS TYPE OF CONSTRUCTION SEQUENCE PROVIDES ROOM FOR STOCKPILED BACKFILL DIRECTLY BEHIND THE BACKHOE, AS WELL AS THE MOVEMENT OF CONSTRUCTION TRAFFIC. MATERIAL STOCKPILES ON TOP OF THE BACKFILLED DETENTION SYSTEM SHOULD BE LIMITED TO 8-TO 10-FEET HIGH AND MUST PROVIDE BALANCED LOADING ACROSS ALL BARRELS. TO DETERMINE THE PROPER COVER OVER THE PIPES TO ALLOW THE THE PROJECT'S ENGINEER OF RECORD IS TO EVALUATE WHETHER SALTING AGENTS WILL BE USED ON OR NEAR THE PROJECT SITE, AND USE HIS/HER BEST JUDGEMENT TO DETERMINE IF ANY ADDITIONAL PROTECTIVE MEASURES ARE REQUIRED. BELOW IS A TYPICAL DETAIL SHOWING THE PLACEMENT OFAGEOMEMBRANE BARRIER FOR PROJECTS WHERE SALTING AGENTS ARE USED ON OR NEAR THE PROJECT SITE. The design and informationshownonthisdrawingisprovided MOVEMENT OF CONSTRUCTION EQUIPMENT SEE TABLE 1, OR CONTACT YOUR LOCAL CONTECH SALES ENGINEER. TYPICAL BACKFILL SEQUENCE EMBANKMENT WHEN FLOWABLE FILL IS USED, YOU MUST PREVENT PIPE FLOATATION. TYPICALLY, SMALL LIFTS ARE PLACED BETWEEN THE PIPES AND THEN ALLOWED TO SET-UP PRIOR TO THE PLACEMENT OF THE NEXT LIFT. THE ALLOWABLE THICKNESS OF THE CLSM LIFT IS A FUNCTION OF A PROPER BALANCE BETWEEN THE UPLIFT FORCE OF THE CLSM, THE OPPOSING WEIGHT OF THE PIPE, AND THE EFFECT OF OTHER RESTRAINING MEASURES. THE PIPE CAN CARRY LIMITED FLUID PRESSURE WITHOUT PIPE DISTORTION OR DISPLACEMENT, WHICH ALSO AFFECTS THE CLSM LIFT THICKNESS. YOUR LOCAL CONTECH SALES ENGINEER CAN HELP DETERMINE THE PROPER LIFT THICKNESS. STAGE POURS AS REQUIRED TO EMBANKMENT WEIGHTED PIPE WITH MOBILE -CONCRETE BARRIERS (OR OTHER REMOVABLE WEIGHTS) CONSTRUCTION LOADING TYPICALLY, THE MINIMUM COVER SPECIFIED FORA PROJECT ASSUMES H-20 LIVE LOAD. BECAUSE CONSTRUCTION LOADS OFTEN EXCEED DESIGN LIVE LOADS, INCREASED TEMPORARY MINIMUM COVER REQUIREMENTS ARE NECESSARY. SINCE CONSTRUCTION EQUIPMENT VARIES FROM JOB TO JOB, IT IS BEST TO ADDRESS EQUIPMENT SPECIFIC MINIMUM COVER REQUIREMENTS WITH YOUR LOCAL CONTECH SALES ENGINEER DURING YOUR PRE-CONSTRUCTION MEETING. ADDITIONAL CONSIDERATIONS BECAUSE MOST SYSTEMS ARE CONSTRUCTED BELOW-GRADE, RAINFALL CAN RAPIDLY FILL THE EXCAVATION; POTENTIALLY CAUSING FLOATATION AND MOVEMENT OF THE PREVIOUSLY PLACED PIPES. TO HELP MITIGATE POTENTIAL PROBLEMS, IT IS BEST TO START THE INSTALLATION AT THE DOWNSTREAM END WITH THE OUTLET ALREADY CONSTRUCTED TO ALLOW A ROUTE FOR THE WATER TO ESCAPE. TEMPORARY DIVERSION MEASURES MAY BE REQUIRED FOR HIGH FLOWS DUE TO THE RESTRICTED NATURE OF THE OUTLET PIPE. CATCH BASIN - INLET WATER PAVED PARKING LOT OUTLET CONTROL as a service to the project owner, engineer and contractor by A~l~ .. IT~AU® DY032851 Conca, Conlech Engineered Solutions LLC ("Contech"). Neither this drawing, nor any part thereof, may be used, reproduced or CMP DETENTION SYSTEM INSPECTION AND MAINTENANCE UNDERGROUND STORMWATER DETENTION AND INFILTRATION SYSTEMS MUST BE INSPECTED AND MAINTAINED AT REGULAR INTERVALS FOR PURPOSES OF PERFORMANCE AND LONGEVITY. INSPECTION INSPECTION IS THE KEY TO EFFECTIVE MAINTENANCE OF CMP DETENTION SYSTEMS AND IS EASILY PERFORMED. CONTECH RECOMMENDS ONGOING, ANNUAL INSPECTIONS. SITES WITH HIGH TRASH LOAD OR SMALL OUTLET CONTROL ORIFICES MAY NEED MORE FREQUENT INSPECTIONS. THE RATE AT WHICH THE SYSTEM COLLECTS POLLUTANTS WILL DEPEND MORE ON SITE SPECIFIC ACTIVITIES RATHER THAN THE SIZE OR CONFIGURATION OF THE SYSTEM. INSPECTIONS SHOULD BE PERFORMED MORE OFTEN IN EQUIPMENT WASHDOWN AREAS, IN CLIMATES WHERE SANDING AND/OR SALTING OPERATIONS TAKE PLACE, AND IN OTHER VARIOUS INSTANCES IN WHICH ONE WOULD EXPECT HIGHER ACCUMULATIONS OF SEDIMENT OR ABRASIVE/ CORROSIVE CONDITIONS. A RECORD OF EACH INSPECTION IS TO BE MAINTAINED FOR THE LIFE OF THE SYSTEM MAINTENANCE CMP DETENTION SYSTEMS SHOULD BE CLEANED WHEN AN INSPECTION REVEALS ACCUMULATED SEDIMENT OR TRASH IS CLOGGING THE DISCHARGE ORIFICE. ACCUMULATED SEDIMENT AND TRASH CAN TYPICALLY BE EVACUATED THROUGH THE MANHOLE OVER THE OUTLET ORIFICE. IF MAINTENANCE IS NOT PERFORMED AS RECOMMENDED, SEDIMENT AND TRASH MAY ACCUMULATE IN FRONT OF THE OUTLET ORIFICE. MANHOLE COVERS SHOULD BE SECURELY SEATED FOLLOWING CLEANING ACTIVITIES. CONTECH SUGGESTS THAT ALL SYSTEMS BE DESIGNED WITH AN ACCESS/INSPECTION MANHOLE SITUATED AT OR NEAR THE INLET AND THE OUTLET ORIFICE. SHOULD IT BE NECESSARY TO GET INSIDE THE SYSTEM TO PERFORM MAINTENANCE ACTIVITIES, ALL APPROPRIATE PRECAUTIONS REGARDING CONFINED SPACE ENTRY AND OSHA REGULATIONS SHOULD BE FOLLOWED. ANNUAL INSPECTIONS ARE BEST PRACTICE FOR ALL UNDERGROUND SYSTEMS. DURING THIS INSPECTION, IF EVIDENCE OF SALTING/DE-ICING AGENTS IS OBSERVED WITHIN THE SYSTEM, IT IS BEST PRACTICE FOR THE SYSTEM TO BE RINSED, INCLUDING ABOVE THE SPRING LINE SOON AFTER THE SPRING THAW AS PART OF THE MAINTENANCE PROGRAM FOR THE SYSTEM. MAINTAINING AN UNDERGROUND DETENTION OR INFILTRATION SYSTEM IS EASIEST WHEN THERE IS NO FLOW ENTERING THE SYSTEM. FOR THIS REASON, IT IS A GOOD IDEA TO SCHEDULE THE CLEANOUT DURING DRY WEATHER. THE FOREGOING INSPECTION AND MAINTENANCE EFFORTS HELP ENSURE UNDERGROUND PIPE SYSTEMS USED FOR STORMWATER STORAGE CONTINUE TO FUNCTION AS INTENDED BY IDENTIFYING RECOMMENDED REGULAR INSPECTION AND MAINTENANCE PRACTICES. INSPECTION AND MAINTENANCE RELATED TO THE STRUCTURAL INTEGRITY OF THE PIPE OR THE SOUNDNESS OF PIPE JOINT CONNECTIONS IS BEYOND THE SCOPE OF THIS GUIDE. PROJECT No.: SEQ. No.: DATE: Fontana 22258 32851 6/1312023 DESIGNED: DRAWN: C ~1~NTECH® ~i,-~~~ri i ~"'" modified in any manner without the prior written consent of Contech. Failure to comply is done at the user's own risk and ENGINEERED SOLUTIONS LLC CMP DETENTION SYSTEMS Ret/lnf Chamber-1 DYO DYO Contech expressly disdaims any liability or responsibility for suchuse. CHECKED: APPROVED: www.ContechES.com Fontana, CA If discrepancies between the supplied information upon which CONTECH I DYO DYO the drawing is based and actual field conditions are encountered 9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069 DYODS as site work progresses, these discrepancies must be reported DETENTION SYSTEM SHEET NO.: to Contech immediately for re-evaluation of the design. Contech 800-338-1122 513-645-7000 513-645-7993 FAX DRAWING accepts no liability for designs based on missing, incomplete or DATE REVISION DESCRIPTION BY 1 inaccurate information suoolied bv others. Corrugated Metal Pipe Infiltration System Solutions Guide ENGINEERED SOLUTIONS 2 © 2015 Contech Engineered Solutions LLC Stormwater Solutions from Contech Selecting the Right Stormwater Solution Just Got Easier... It’s simple to choose the right stormwater solution to achieve your goals with the Contech Stormwater Solutions Staircase. First, select the runoff reduction practices that are most appropriate for your site, paying particular attention to pretreatment needs. If the entire design storm cannot be retained, select a treatment best management practice (BMP) for the balance. Finally, select a detention system to address any outstanding downstream erosion. Learn more about all of our stormwater technologies at www.ContechES.com/stormwater D esign Y our o wn D etention or i nfiltration s Y stemDYODS The Contech Design Your Own Detention System (DYODS®) tool fully automates the layout process for stormwater detention and infiltration systems and produces CAD and PDF files that can be used for creating plans and specs, and for estimating total installed costs. To use the Design Your Own Detention or Infiltration System tool, visit: www.ContechES.com/dyods Surface Infiltration/ m Bio retention 1111 I Subsurface Infiltration I Rainwater Harvesting Biofiltration Filtration Hydrodynamic Separation 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. C()NTECH ® C()NTECH " □ Site Design & Landscape Planning SD-10 Description Design Objectives 0 Maximize Infiltration 0 Provide Retent ion 0 Slow Runoff 0 Minimize Impervious Land Coverage Prohibit Dumping of Improper Materials Contain Poll utants Coll ect and Convey Each p roject site possesses unique top ogr aphic, hyd rologic, and vegetative featur es, some of which are more suit able for developm ent th an others. I n t egrating and incorporating a p propr iat e lan dscape plann ing meth odologies into the project design is the most effective action that can be done to minimize smface and groundwater con tamination from stor mwater. Approach Lan dscap e plann in g should couple con sideration of land suitability for urban uses with consideration of commun ity goals an d project ed growth. P roject plan design s should conserve natural ar eas to th e extent possibl e, maxim ize natural water storage and infiltration opp ortunit ies, and p rotect s lopes and ch an nels . Suitable Applications Approp riate application s include r esiden tial , commercial an d industrial a r eas pla nne d for development o r redevelopmen t. Design Considerations Design r eq uir ements for site design and landscapes plann ing s h oul d conform to applicable s t andar ds and s p ecification s of agencies with j urisdiction a n d be consist ent with applicable Gen eral Plan and Local Area Plan policies. January 2003 California St orm water BM P Handbook New Devel opm ent and Redevelopment www.cabm phandb ooks.com CALIFORKIA SfOR.\IWA TER l I 1 of 4 SD-10 Site Design & Landscape Planning Designing New Installatio ns Begin the development o f a plan for the lan dscape unit with atten tion to th e fo llowin g general principles: ■ Fo r mulate th e plan on the basis of clearly articulated commu n ity goals. Carefully identify conflict s and choices between r etainin g an d protecting desir ed r esources a n d community growth. ■ Map and assess land suitability for urban uses . I nclude t h e following l andscape features in the assessment: wood ed land, open unwooded land, s teep slopes, erosion-pron e soils, foun datio n s u itability, soil suitability for waste dispo sal , aquifers, aquifer r echarge ar eas, wetla nds, floodplains, surface waters, agricu ltural l ands, and various categories of urban lan d use. When appropriate, the assessm ent can h ighlight outstan din g local or regional r esources that the community determin es should be protected (e.g ., a scen ic area, r ecreational area, threatened species habitat, farml and, fish run). Mapping and assessm ent should r ecogn ize not only t h es e resources b ut al so additional areas need ed for their susten an ce. Project plan designs s h ould conserve n atural areas to the extent possible, maximize n atural water storage and infiltration opportun ities, an d protect slo pes a nd chann els . Conserve Natural Areas during Landscape Planning If applicabl e, t h e following items are requir ed and m u st be implemen ted in the site l ayout durin g the subdivision design and approval p rocess, consistent with applicable General Plan a n d Local Area Plan policies: ■ Cluster developmen t on least-sen sitive portions of a s ite wh il e leaving the r emainin g la nd in a n atural undisturbed condition. ■ Li mit clearing a n d grading of native veget atio n at a site to the minimu m amoun t n eeded to b uild lots, allow access, and provide fire p rotection. ■ Maximize trees a n d oth er vegetation at each site by planting a d ditio nal vegetation, clusterin g t r ee areas, and promoting t h e use of native and/ or drought tol erant p lants. ■ P romote natu ral vegetation by using parking lo t islands and other l an dscaped areas. ■ Preserve riparian areas and wetlands. Maximize Natural Water Storage and I nfiltration Opportunities Within the Landscape Unit ■ P romote the conservatio n of forest cover . Building on land that is already defor est ed affects basin hydrology to a lesser extent than con verting forest ed land. Loss of forest cover redu ces intercept io n s t orage, detention in t he organ ic for est floor layer, a n d water l osses b y evapotranspirat ion, resulting in large peak runoff increases and eith er th eir negative effects or the expen se of countering them with structural solutions. ■ Maintain nat ural s torage reservoir s and drainage corr idors, includin g depr essions, a r eas of per meabl e soils, swales, and inter mittent s t r eams. Develop and impl em ent policies a nd 2 of 4 Californ ia Stormwater BM P Handbook New Devel opment a nd Redevelopment www.cabmpha ndbooks.com January 2003 Site Design & Landscape Planning SD-10 r egulat ions t o d iscou rage the clearing, filling, and channelization of t h ese feat ures. Ut ilize them in drainage n etworks in p referen ce to pipes, culverts, and en gineered dit ches. ■ Evalu ating infilt ration oppor t u n ities by referr ing to the s t orm water management manual for the j u risdiction and pay particular atten tion to t he sel ection criteria fo r avoiding grou ndwater contam ination, poor soils , and hydrogeological co nditio n s that cau se these facilit ies to fail. If necessary, l ocat e developm ent s with l arge amoun ts of imp erviou s surfaces or a poten tial to produce rel at ively contaminat ed runoff away from groundwater r echarge a r eas. Protection of Slopes and Channels during Landscape Design ■ Con vey runoff saf ely fro m the tops of s lopes. ■ Avoid disturbin g steep or u n stable s lopes. ■ Avoid d isturbing n atural ch annels. ■ Stabilize disturbed slopes as quickly as possible. ■ Veget ate slo pes with native or drou ght toleran t vegetation. ■ Con trol and treat flows in l andscaping and/o r other controls p rior to r eaching existin g n atural drain age syst ems. ■ Stabilize temporary a n d permanen t ch annel crossings as quickly as possible, and ensure that increases in run-off velocity and frequen cy cau sed by the p roject do not erod e the chann el. ■ Ins t all ener gy dissipaters, such as rip rap, at t h e ou tlets of new storm drains, cu lverts, co ndu its, o r ch annels t hat enter u n lin ed channels in accordance with applicabl e specificat ion s to minimize erosion. E nergy dissipat er s shall be installed in such a way as to min im ize impacts to r eceiving waters. ■ Li ne o n-site conveyance channels wher e approp1;at e, to reduce erosion cau sed by increased flow vel ocity due to incr eases in t r ibu tary impervio u s ar ea. The fi r s t choice for lin ings sh ould be grass or some other vegetative surface, sin ce these mat er ial s not o n ly r e duce runoff velocities, but also provide water quality benefit s from filt ration a n d infi ltration . If velocities in the channel ar e h igh en ough t o erode grass o r oth er vegetat ive linings, rip rap, co ncrete, soil cem ent, or geo-gr id stabilization are oth er alternatives. ■ Con sider other design p rinciples that a r e comparable a nd eq ually effective. Redeve loping Existing Installations Vai;ous j m;sdictional stor mwater management an d m it igation pl ans (SUSMP , WQMP , et c.) define "redevelopment" in terms of amounts of add ition al im perviou s area, in cr eases in gross floor area and/or exterior con s t ruction, an d land disturbing activities with structural or imp ervious s urfaces . The definition of " redevelopmen t" must be consult ed to d eter mine wh ether or not the requ irements for n ew development a pply to a r eas in tend ed fo r redevelop ment. If th e d efinitio n applies, th e s t eps outlined under "designing new in stallations" above sh ould be followed. January 2003 Californ ia Storm water BM P Ha ndbook New Devel opm e nt a nd Red evelopment www.cabm pha ndbooks.com 3 of 4 SD-10 Site Design & Landscape Planning Redevelopment may p r es ent significant opportu n ity to add features which had not previou sly been im pleme nted. Examples include incorporat ion of depressions, a r eas of permeabl e soils, an d swales in newly redevelop ed areas. Whil e some site constraints may exist due t o the s t at us of already existing in fras tructur e, oppor t u nities should not b e missed t o maximize infiltration, s low r u noff, redu ce impervious areas, dis connect d irectly conn ected imperviou s areas . Other Resources A Man ual for the Standard Urban Stor m water M it igation Plan (SUSMP), Los Angeles Cou nty Department of P ublic Wor ks, May 2002. Stormw at er Management Man ual for West ern Was h ington , Washington State Departmen t of Ecology, Au gust 2001. Model Standar d Urban St orm Wat er Mitigation Plan (SUSMP) for San Diego County, P ort of Sa n Diego, and Cities in San Diego County, February 14 , 2002. Model Water Qu ality Management Plan (WQMP ) for Cou nty of Orange, Orange County Flood Control Dist rict, and the I n corporated Cit ies of Orange County, Draft F ebruary 2003. Vent ura Countywide Techn ical Guidance Manual for Stor m water Qu ality Cont rol Measures, July 2002. 4 of 4 Ca liforn ia St ormwat e r BMP Ha ndbook New Dev el opme nt a nd Redevelop m ent www .cabm phandbooks .com January 2003 Roof Runoff Controls Rain Garden Description Various roof r unoff cont rols are available to address stonnwater SD-11 Design Objectives 0 Maximize Infi ltration 0 Provide Retention 0 Slow Runoff Minimize Impervious Land Coverage Prohibit Dumping of Improper Materials 0 Contain Poll utants Coll ect and Convey t h at drains off rooftops. The obj ective is to redu ce the total volu me and rate of run off from ind ividual lots, and r et ain the p ollutants on site t h at may be p icked up from roofing mat erials a n d atmosp heric deposit io n . Roof run off controls con s ist of d irecting the roof runoff away from paved areas and m itigating flow t o t he s t orm d rain system throu gh one of several gen eral a p proaches: cist erns or rain bar rels; dry wells or in filtration t r enches; p op-up emitter s, and fou ndation p lanting. The first thr ee approach es requ ire the roof runoff to be contain ed in a gutter and d ownspou t system . Foun datio n plan ting p rovides a vegetated strip und er the drip line o f the roof. Approach Design of in divid ual lots for sin gl e-fam ily homes as well as lots for h igher d ensity residential and commercial struct ures should con sider site design provision s for contain ing and infiltrating roof run off or directing roof runoff to vegetative swales or b u ffer areas. Retained water can be r eused for watering gar dens, lawns, and t rees. Ben efits t o the en vironmen t includ e r educed deman d for potabl e water used for irrigation, im proved stormwater quality, in cr eased groundwat er recharge, decreased r unoff volume an d p eak fl ows, and d ecr eased floo ding potential. Suitable Applications Appropriat e application s include r esiden tial , commercial an d industrial a r eas pla nned for development or redevelopmen t. Design Considerations Designing N ew Installations Cist erns or R ain Barrels One method of addr essing roof runoff is t o d ir ect roof downsp outs t o cisterns or rain barrels. A cister n is an above ground storage vessel with either a m anually op erat ed valve o r a perman ently open ou tlet. Roo f runoff is temporarily stor ed and the n rel eased for ir rigation o r infiltration between storms. The num ber of rain CALIFORKIA SfOR.\IWA TER January 2003 Californ ia Storm water BM P Handbook New Devel opment and Redevelopment www .cabmphandbook.com l I 1 of 3 SD-11 Roof Runoff Controls barrels needed is a function of the rooftop ar ea. Some low impact developers recommend that eve1y house have at least 2 rain barrels, with a minimum storage capacity of 1000 liters. Roof barrels serve several purposes including mitigating the fir st flush from the roof which has a high volume, amount of contaminants, and thermal load. Several types of rain barrels are commercially available. Consideration must be given to selecting rain barrels that are vector proof an d childproof. In addition, some barrels are designed with a bypass v alve that filters out grit an d other contamina nts and routes overflow to a soak-away pit or rain garden . If the cist ern has an operable valve, the valve can be closed t o stor e stormwater for irrigation or infiltration between storms. This system requires continual monitoling by the resident or grounds crews, but provides greater flexibility in water storage a nd met eling. If a cistern is provided with an operable valve and wat er is stored inside for lo n g peliods, th e cistern must be covered to prevent mosquitoes from breeding. A cistern system with a p ermanen tly open outlet can also provid e for meteling stormwater runoff. If the cistern outlet is significantly smaller than the size of the downsp out inlet (say¼ to ½ inch diameter ), runoff will b u ild up inside the cistern during storms, and will empty out s lowly after peak inten sities s u bside. This is a feasible way to mitigate the peak flow increases cau sed by roo ftop impervious land coverage, especially for the frequent, small storms. Dry wells and Infiltration Trenches Roof downspouts can be directed to d ry wells or infiltration trenches. A d ry well is construct ed by excavating a hole in the ground a nd filling it with a n open graded aggregat e, and allowing the water to fill the dry well and infiltrate after the storm event. An underground connection from the downspout conveys water into the dry well, allowing it to be stored in the voids. To min imize sedimentation from lateral soil movement, the sides and top of the stone stor age m atrix can be wrapped in a p ermeable filter fabric, though the bottom may remain open. A perforated observation pipe can be inserted ve1tically into the diy well to allow for inspection a n d maintenance. In practice, dry wells receiving runoff from single roof downspouts have been successful over long periods b ecau se they contain very littl e sediment. They must be sized according to t h e amount of rooftop runoff received, but are typically 4 to 5 feet square, and 2 to 3 feet d eep, with a minimum of I-foot soil cover over the top (maximum depth of 10 feet). To protect the foundation, d1y wells must be set away from the building at l east 10 feet. They must be installed in solids that accommodate infiltration. In poorly drained soils, d1y wells h ave very limit ed feasibility. Infiltration t renches function in a s imilar m anner a nd would be particularly effective for larger roof a reas. An infiltration t rench is a long, narrow, rock-filled t rench with no outlet that r eceives s tormwater runoff. These are d esclibed under Treatment Controls. Pop-up Drainage Emitter Roof downspouts can be directed to an u nder ground pipe that daylights some dis t ance from the building foundation, releasing the roof runoff through a pop-up emitter. Simil a r to a pop-up irligation hea d , the emitter only open s when there is flow from the roof. The emitter remains flush to the ground duling dry peliods, for ease oflawn o r l andscape maint enance. 2 of 3 California Stormwater BMP Handbook New Devel opment and Redevelopment www .cabmph andbook.com January 2003 Roof Runoff Controls SD-11 Foundation Planting Landscap e planting can be provided around the base t o allow in cr eased opportunities for s tormwater infiltrat ion a nd p rotect the soil from erosion caused by concentr ated sheet fl.ow comin g off the roof. Fo u ndation plan tin gs can reduce the physical impact of water o n the soil a n d p rovide a su bsurface m atrix of roots that en courage infiltration. These p lantings must be s t urdy enough to tolerate the heavy run off s heet flows , and periodic soil saturation. Redeve loping Existing Installations Various j u risd ictional s t orm water management and m itigation plans (SUSMP , WQMP , etc.) define "redevelopment" in terms of amounts of addition al im pervious area, in cr eases in gross floor area and/or exterior con s t ruct ion, an d land d ist u rbing activities with structural or imp ervious surfaces. The defin ition of " redevelopmen t" mu st be consulted to d eter mine whether or not the requ irements for n ew development a p ply to a r eas in tend ed fo r redevelop ment. If the definitio n applies, the steps outlined under "designing new in stallatio ns" above sh ould be followed. Supplemental Information Examples ■ City of Ottawa's Water Lin ks Smface -Water Quality Protection P rogram ■ City of To ronto Downspou t Disconn ectio n Program ■ City of Bosto n, MA, Rain Barrel Demonstration P rogr am Other Resources H ager, Ma1ty Catherine, Stor mwater, "Low-Impact Development", January/F ebru ary 2003. www.stormh 2o.com Low I mpact Urban Design Tools , Low I m p act Develop ment Design Center, Beltsville, MD . www.lid-stormwat er.net Start at the Source, Bay Area Stormwate r Manageme nt Agencies Association , 1999 Edition January 2003 Ca lifornia Stor m water BM P Ha ndb ook New Devel opm ent and Red evelopment www .cab m phand book .co m 3 of 3 Efficient Irrigation SD-12 Design Objectives 0 Maximize Infi ltration 0 Provide Retention 0 Slow Runoff Minimize Impervious Land Coverage Prohibit Dumping of Improper Materials Description Contain Poll utants Coll ect and Convey Irrigation water provided to la ndscaped a r eas may r esult in excess irr igation water bein g conveyed in to stormwater drain age systems. Approach Project p l an designs for d evelopmen t and r edevelopment sh ould include application methods of irrigation wat er that m inimize runoff of excess irrigation water in t o the stor mwater conveyance system. Suitable Applications Approp riate application s include r esiden tial, comme rcial an d industrial ar eas planne d for development o r redevelopmen t. (Detached r esidential single-fam ily h omes are typically excluded from this requ irement.) Design Considerations Designing New Installations The following m et hods to r educe excessive irrigation runoff should be considered, and incorporat ed and implemented where determined applicable and feasibl e by the P ermittee: ■ Employ r ain-trigger ed shu toff devices t o prevent ir rigation after precip it ation. ■ Design irrigation system s t o each land scape area's specific water requirements. ■ Includ e design fe aturin g flow reducer s or shutoff valves t r iggered by a pressu re drop to control wat er loss in the event of b roken s p rinkler heads or lines. ■ I mplemen t landscape plans consist ent with County or City wat er con servatio n r esolutions, which may in clude provisio n of water sensors, progr ammable irrigation times (for sh01t cycles), etc. CALIFORKIA SfOR.\IWA TER January 2003 California St orm water BM P Handbook New Devel opm ent and Redevelopment www.cabm phandb ooks.com L I 1 of 2 SD-12 Efficient Irrigation ■ Design timin g and application methods of irrigation water to minimize the runoff of excess irrigation water into the storm water drainage system. ■ Group plants with similar water requirements in order to reduce excess irrigation run off and promote surface filtration. Choose plants with low irrigation requirements (for example, native or drought tolerant species). Consider design features such as: Using m u lch es (such as wood chips or bar) in pl anter areas without ground cover to minimize sediment in runoff Installing appropriate plant materials for t h e location, in accordance with amount of s u nlight and climate, and u se n ative plant material s where possible and/or as recommended by the landscape architect Leaving a vegetative barrier along the property bou ndary and interior watercourses, to act as a pollutant filter, where appropriate and feasible Choosing p lants t h at minimize or eliminate the use of fertilizer or pesticides to sustain growth ■ Employ other comparabl e, equally effective methods to reduce irrigation water runoff. R e d eveloping Existin g I nst a lla tions Various jurisdictional stormwater management and mitigation pl ans (SUSMP, WQMP, etc.) define "redevelopment" in terms of amounts of addition al impervious area, increases in gross floor area and/or exterior const ruction, an d land disturbing activities with structural or impervious surfaces. The definition of " redevelopment" must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under "designing new installations" above should be followed. Other Resources A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles Cou nty Department of Public Works, May 2002. Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14 , 2002. Model Water Quality Management Plan (WQMP ) for County of Orange, Orange County Flood Control Dist rict, and the Incorporated Cities of Orange County, Draft February 2003. Vent ura Countywide Techn ical Guidance Manual for Stormwater Quality Control Measures, July 2002. 2 of 2 Californ ia St orm water BM P Hand book New Devel opm ent and Redevelopment www.cabm phandb ooks.com Jan uary 2003 Storm Drain Signage Description SD-13 Design Objectives Maximize Infi ltration Provide Retention Slow Runoff Minimize Impervious Land Coverage 0 Prohibit Dumping of Improper Materials Contain Poll utants Coll ect and Convey Waste mat erials dumped in to storm d r ain inlets can have severe impacts o n receiving and groun d waters. Post in g n otices r egardin g dis ch ar ge prohib itions at storm drain in lets can prevent waste d u mping. Stor m drain sign s and stencils are highly visible source con trols that a r e typically placed directly adjacent t o storm drain inlets. Approach The s t encil or affixed sign contains a b rief statement that prohib it s dumping of improper mater ials into the urban runoff conveyan ce system. Stor m drain messages have become a pop ular m ethod of aler t in g the p u blic about th e effects of a n d the prohibit ions against waste disposal. Suitable Applications St encils and sign s alert the p u b lic to the destin ation of pollutan ts dischar ged t o the storm drain. Signs ar e appropriate in residential , commer cial , and indust rial areas, as well as any other area where contributio n s or d u mping t o storm drain s is likely. Design Considerations St orm drain message markers or placar ds are recommended at all storm drain inlet s within the bound ary of a development project. The marker s h oul d be placed in clear s ight facing toward an yone approaching t h e in let from eith er side. All storm drain inl et location s should be identified on the development site map . D e signing New Insta llations The following m ethods sh oul d be con sidered for inclu sion in the project design a nd show on p roject p l an s: ■ P rovide s t encil ing or l abeling of all storm drain inl ets and catch basin s , con structed or modified, within the project a r ea with prohibitive language. Examples includ e "NO DUMP ING January 2003 California St orm water BM P Handb ook New Devel opm ent and Redevelopment www.cabm phandb ooks.com CALIFORKIA SfOR.\IWA TER l I 1 of 2 SD-13 Storm Drain Signage -DRAINS TO OCEAN" and/or other graphical icons to discourage illegal dumping. ■ P ost sign s with prohibitive language an d /or grap h ical icons, wh ich proh ibit illegal dumping at p ublic access poin ts along ch ann els and creeks within the project area. Note -Som e local agencies h ave approved specific sign age a nd/or storm drain message placards for u se. Consu lt local agency stormwat er s t aff to det er mine specific requ irem ents fo r placard types and methods of application. Redeve loping Existing Installatio ns Various jurisdictional stor mwater management and m itigation pl ans (SUSMP , WQMP , et c.) d efine "redevelopment " in terms of amounts of addition al im perviou s area, in cr eases in gross floor area and/or exter ior con s t ruction, an d land d istu rbing activities with structural or imp ervious surfaces. If the p roject meets the definition of "redevelopment", then the requ irements stated u nder " designing new installation s " above sh ould be included i n all project d esign p lan s . Additional Information Maintenance Conside rations ■ Legibility of markers and signs should be main tained. If requ ired by th e agency with jur isdiction over the proj ect, t h e owner /operator or homeowner 's association sh ould en ter into a mainten a n ce agreeme nt with the agen cy o r r ecor d a deed restriction up o n th e p roperty tit le t o maintain th e l egibility of placards or sign s. Placem e nt ■ Sign age on top o f curbs t ends to weather and fad e. ■ Signage o n face of curbs tends to be wor n by con tact with vehicle tires an d sweeper brooms. Supplemental Information Examples ■ Most MS4 p rograms h ave storm drain signage programs. Som e MS4 progr ams w ill provide sten cil s , o r arrange for volunteers to stencil sto rm drains as part of their ou t r each program. Other Resources A Man ual for t h e St andard Urban Stor mwater M itigation Plan (SUSMP), Los Angeles Cou nty D epartment of P ublic Wor ks, May 2002. Model Stand a r d Urban St orm Wat er Mitigation Plan (SUSMP) for San Diego County, P ort of San Diego, and Cities in San Diego County, Februa ry 14 , 2002. Model Water Qu ality Management Plan (WQMP ) for Cou nty of Orange, Orange County Flood Control Dist rict, and the Incorporated Cities of Orange County, Draft F ebruary 2003. Vent ura Countywid e Techn ical Guidance Manual for Stor mwater Qu ality Control Measures, J u ly 2002. 2 o f 2 Cal iforn ia St or m water BM P Handb ook New Devel opm ent and Redevelopment www.cab m phandb ooks.com January 2003 Retention/Irrigation Description Retention/irrigation refers to the capture of stormwater runoff in a holding pond and subsequent use of the captured volume for irrigation oflandscape of natural pervious areas. This technology is very effective as a storm water quality practice in that, for the captmed water quality volume, it provides viI.tually no discharge to receiving waters and high stormwater constituent removal efficiencies. This technology mimics natural undeveloped watershed conditions wherein the vast majority of the rainfall volume during smaller rainfall events is infilh·ated through the soil profile. Their main advantage over other infiltration technologies is the use of au irrigation system to spread the runoff over a larger area for infilh·ation. This allows them to be used in areas with low permeability soils. Capture of stormwater can be accomplished in almost any kind of runoff storage facility, ranging from chy, concrete-lined ponds to those with vegetated basins and permanent pools. The pump and wet well should be automated with a rainfall sensor to provide irrigation only during periods when required infiltration rates can be realized. Generally, a spray irrigation system is required to provide fill adequate flow rate for dish·ibuting the water quality volume (LCRA, 1998). Collection of roof runoff for subsequent use (rainwater harvesting) also qualifies as a retention/irrigation practice. This technology is still in its infancy and there are no published reports on its effectiveness, cost, or operational requirements. The guidelines presented below should be considered tentative until additional data are available. California Experience This BMP has never been implemented in California, only in the Austin, Texas area. The use there is limited to watersheds where no increase in pollutant load is allowed because of the sensitive nature of the watersheds. Advantages 111 Pollutant removal effectiveness is high, accomplished primruily by: (1) sedimentation in the primruy storage facility; (2) physical filtration of pruticulates through the soil profile; (3) dissolved constituents uptake in the vegetative root zone by the soil-resident microbial community. January 2003 California Stormwater BMP Handbook New Development and Redevelopment www.cabmphandbooks.com TC-12 Design Considerations 111 Soil for Infiltration 111 Area Required 1111 Slope 1111 Environmental Side-effects Targeted Constituents 1111 0 Nutrients 11111 0 Trash 11111 0 Metals 111111 0 Bacteria iii! 0 Oil and Grease 1111 0 Organics 1111 Legend (Removal Effectiveness) • Low Ill High A Medium 1 of 5 Trash Storage Areas Description Trash storage areas are areas where a trash receptacle (s) are located for use as a repository for solid wastes. Stormwater runoff from areas where trash is stored or disposed of can be polluted. In addition, loose trash and debris can be easily transported by water or wind into nearby storm drain inlets, channels, and/or creeks. Waste handling operations that may be sources of stormwater pollution include dumpsters, litter control, and waste piles. Approach This fact sheet contains details on the specific measures required to prevent or reduce pollutants in stormwater runoff associated with trash storage and handling. Preventative measures including enclosures, containment structures, and impervious pavements to mitigate spills, should be used to reduce the likelihood of contamination. Suitable Applications SD-32 Design Objectives Maximize Infi ltration Provide Retention Slow Runoff Minimize Impervious Land Coverage Prohibit Dumping of Improper Materials 0 Contain Pollutants Collect and Convey Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. (Detached residential single-family homes are typically excluded from this requirement.) Design Considerations Design requirements for waste handling areas are governed by Building and Fire Codes, and by current local agency ordinances and zoning requirements. The design criteria described in this fact sheet are meant to enhance and be consistent with these code and ordinance requirements. Hazardous waste should be handled in accordance with legal requirements established in Title 22, California Code of Regulation. Wastes from commercial and industrial sites are typically hauled by either public or commercial carriers that may have design or access requirements for waste storage areas. The design criteria in this fact sheet are recommendations and are not intended to be in conflict with requirements established by the waste hauler. The waste hauler should be contacted prior to the design of your site trash collection areas. Conflicts or issues should be discussed with the local agency. Designing New Installations Trash storage areas should be designed to consider the following structural or treatment control BMPs: ■ Design trash container areas so that drainage from adjoining roofs and pavement is diverted around the area(s) to avoid run-on. This might include berming or grading the waste handling area to prevent run-on of stormwater. ■ Make sure trash container areas are screened or walled to prevent off-site transport of trash. January 2003 California Stormwater BMP Handbook New Development and Redevelopment www.cabmphandbooks.com CAUFORl\"IASTORMWATER I I 1 of 2 SD-32 Trash Storage Areas ■ Use lined bins or dumpsters to reduce leaking ofliquid waste. ■ Provide roofs, awnings, or attached lids on all trash containers to minimize direct precipitation and prevent rainfall from entering containers. ■ Pave trash storage areas with an impervious surface to mitigate spills. ■ Do not locate storm drains in immediate vicinity of the trash storage area. ■ Post signs on all dumpsters informing users that hazardous materials are not to be disposed of therein. Redeveloping Existing Installations Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define "redevelopment" in terms of amounts of additional impervious area, increases in gross floor area and/ or exterior construction, and land disturbing activities with structural or impervious surfaces. The definition of" redevelopment" must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under "designing new installations" above should be followed. Additional Information Maintenance Considerations The integrity of structural elements that are subject to damage (i.e., screens, covers, and signs) must be maintained by the owner/operator. Maintenance agreements between the local agency and the owner/ operator may be required. Some agencies will require maintenance deed restrictions to be recorded of the property title. If required by the local agency, maintenance agreements or deed restrictions must be executed by the owner/ operator before improvement plans are approved. Other Resources A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002. Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002. Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003. Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002. 2 of 2 California Stormwater BMP Handbook New Deve lopment and Redevelopment www.cabmphandbooks .com January 2003 -See CASQA Stormwater Handbook BMP Fact Sheet SD-13 for additional information. • (S2) Design Outdoor Hazardous Material Storage Areas to Reduce Pollutant Introduction (SD-34) -Improper storage of materials outdoors may increase the potential for toxic compounds, oil and grease, fuels, solvents, coolants, wastes, heavy metals, nutrients, suspended solids, and other pollutants to enter the MS4. Where the plan of development includes outdoor areas for storage of hazardous materials that may contribute pollutants to the MS4, the following stormwater BMPs are required: -Hazardous materials with the potential to contaminate urban runoff shall either be: (a) placed in an enclosure such as, but not limited to, a cabinet, shed, or similar structure that prevents contact with runoff or spillage to the MS4; or (b) protected by secondary containment structures (not double wall containers) such as berms, dikes, or curbs. -The storage area shall be paved and sufficiently impervious to contain leaks and spills. -The storage area shall have a roof or awning to minimize direct precipitation and exposure, and collection of stormwater within the secondary containment area. -Any stormwater retained within the containment structure must not be discharged to the street or storm drain system. -Location(s) of installations of where these preventative measures will be employed must be included on the map or plans identifying BMPs. -See CASQA Stormwater Handbook Section 3.2.6 and BMP Fact Sheet SD-34 for additional information. • (S3) Trash Enclosures to Reduce Pollutant (CASQA BMP Handbook SD-32) -Design trash storage areas to reduce pollutant introduction. All trash container areas shall meet the following requirements (limited exclusion: detached residential homes): -Paved with an impervious surface, designed not to allow run-on from adjoining areas, designed to divert drainage from adjoining roofs and pavements diverted around the area, screened or walled to prevent off-site transport of trash; and -Provide solid roof or awning to prevent exposure to direct precipitation. -Connection of trash area drains to the MS4 is prohibited. See CASQA Stormwater Handbook Section 3.2.9 and BMP Fact Sheet SD-32 for additional information. • (S4) Use Efficient Irrigation Systems and Landscape Design (CASQA BMP Handbook SD- 12) The Water Conservation in Landscaping Act of 2006, Assembly Bill 1881 (AB 1881), 98 WQMP EXHIBIT Civil Engineering - Land Surveying - Land Planning 16866 Seville Avenue Fontana, California 92335 ALLARD ENGINEERING Prepared By: PHONE (909) 356-1815 Fax (909) 356-1795 ea DMAs AREA (AC)BMP 1 inch = ft. ( IN FEET ) GRAPHIC SCALE 080 80 80 4040 L 5'¢, 12' ROCK CHAMBER DEPTH 16 SYSTEM CAPACITY: 3,577 CF EACH 10 DETENTION CHAMBER SYSTEM-2@ ®~ BUBLW~N EXISTING ROCK DRYWELL SYSTEM-1,2,3 ~ ( 48 DRAWDOWN TIM£) , I 5' DIA Pl~fS, 350'x29.5' JO w u - j _ Q_ 2§ z,c- 0 u j!_ er Q_ - ~ =[g <i. Q_ (0 z ~ c3 - Bt EDER PIPE w (_) j [L z c- l;] c-o ~8 =o [lJ ~ (FF=937.5) ~ 13 f1?\ RET /INF CHAMBER S STEM L 1 ~ ~, PRovmrn VOLUME= 2, rnd cr~ (@) CHAMBER FOOTPRINT. 5, 162I5-SF 5' DIA PIPES, 173'X2 .5' j__j ~s V -;,·/ l ,, "' -"I N :,?'/ )<0 ~ 1.~ ~ _lJ1L J'·O'j,·7' N I -EDER PIPE . I· 1~ ;ii I tl ~'v s I I I I I I I I .5%"' - c?''<·-:i Fi -· ....... "'~ BLPG. 1 I 107,670 S.F. -U"'Tl Ej 7i1 II CO co.i:,,. .i:,,.~ CTI o, C) -u "'Tl L Ejl7i1 II CO ~ co.i:,,. .i:,,. !=" ~o "' □a° ~-I•. ~ ~ ~L--.......,,----'---'------'----......,_---'-----'----..__---------..__-_____...__ _ ____. '" 0 i:o -" +' "' * I I I l/) I~ I ~ I )> )> 1~ I I I I I I I I I I I" 11111 11· --*---~~----~"'!"~-~ ... '-+"--~~ ~~-~ ~~ ~~ -~ -~ -~ ....... --"-c~~ ~-~~!:;li;:=+==1= , I I BMP LIST: G) EDUCATION OF PROPERTY OWNERS 0 ACTIVITY RESTRICTIONS c5 @ TRASH STORAGE AREAS (SD-32) @ RET /INF CHAMBER SYSTEM-1 (CONTECH CMP 5'D/A PIPE) 0 SPILL CONTINGENCY @ DETENTION CHAMBE~ SYSTEM-2 G) TRAINING/£DUCATION PROGRAM (CONTECH CMP 4-5 DIA PIPES) rc\ DRIVEWAY/PARKING LOT VACUUM SWffP/NG @EXISTING DRYW[LL SYSTEM (TYP. OF 3) \.:!__} (5'DIA, 12'0 GRAVEL PITS) 0 CATCH BASIN INSPECTION 0 LANDSCAPE PLANNING (SD-10) ® ROOF RUNOFF CONTROLS (SD-11) ® ffFIC/fNT /RR/GA/ON (SD-12) @sTORM DRAIN SIGNAG[ (SD-13) @1NL£T TRASH RACK WQMP EXHIBIT 00 " o,,o --------~~-------' BMP STATISTICS: RETENT/ON//NF/L TRAT/ON CHAMBER-1 DA-1 7.8 EX. DRYWE1L SYSTEM (TYP. OF 3) ■■ SCALE: 1"=80'-o• REQUIRED VOLUME (CF) PROVIDED VOLUME (CF) 22,180 32,406 10,731 CF TOTAL MITIGATION PROVIDED; 32,911 CF DCV ACHE/VED WITH PROPOSED BMPs: 101.5% PREPARED FOR: THE CONCO COMPANIES 13052 DAHLIA STREET FONTANA, CA 92337 PH: (925) 685-6799 Filename: I: \Conco Companies\DWG\ENTITLEMENT\EXHIBITS\WQMP EXHIBIT.dwg 7 _J PROP. PARKWAY DRAIN TO CITY STORM DRAIN SYSTEM