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Parcel Map 36203 Parcel 1 WQMP
City of Temecula WATER QUALITY MANAGEMENT PLAN (WQMP) PROJECT NAME & PERMIT NO: Tesla Temecula Repair Facility PA24-0069 PROJECT ADDRESS: 27635 Diaz Rd, Temecula, CA 92590 PROJECT APN: 921-030-043 PREPARED BY: Kimley-Horn and Associates 1100 Town and Country Rd, Suite 700 Orange, CA 92868 (714) 939-1030 Thomas.Kim@kimley-horn.com PREPARED FOR: Diaz Re Holdings, LLC 18301 Von Karman Avenue, Suite 250 Irvine, CA 92612 (949) 554-3721 damian@greenlawpartners.com DATE OF WQMP: July 2024 APPROVED BY: APPROVAL DATE: LD24-2361 September 2024October 2024 APPROVED BY CITY OF TEMECULA PUBLIC WORKS david.pina 11/04/2024 11/04/2024 11/04/2024 11/04/20 ii WQMP Template Date: October 31st, 2018 Preparation Date: March, 2024 Applicant's Certification Project Name: Tesla Temecula Repair Facility Permit Number: PA24-0069 APPLICANT'S CERTIFICATION I have read and understand that the City of Temecula has adopted minimum requirements for managing urban runoff, including stormwater, from land development activities, as described in the BMP Design Manual. I certify that this WQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable BMPs proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I understand and acknowledge that the plan check review of this WQMP by City staff is confined to a review and does not relieve me, as the Applicant, of my responsibilities for project design. I hereby declare that the design is consistent with the requirements of the City of Temecula BMP Design Manual, which is a design manual for compliance with local City of Temecula Stormwater and Urban Runoff Management and Discharge Controls Ordinance (Chapter 8.28 et seq.) and regional MS4 Permit (California Regional Water Quality Control Board San Diego Region Order No. R9-2013-0001 as amended by R9-2015-0001 and R9-2015-0100) requirements for stormwater management; as well as the requirements of the City of Temecula Engineering and Construction Manual (Chapter 18) and the City of Temecula Erosion and Sediment Control Ordinance (Chapter 18.18 et seq.). Applicant’s Signature Date: Thomas Kim Print Name Kimley-Horn and Associates Company STOP! Before continuing this form review Chapter 1.3 of the BMP Design Manual. If the project type is listed in Table 1-2, permanent stormwater requirements do not apply to your project. Write your exempt project category in the space provided below and skip to Step 3. Do not complete Steps 1, 2, or 4 of this WQMP. Exempt Project category 07/24/2024 , LD24-2361 09/30/202410/15/2024 WQMP 3 Template Date: October 31st, 2018 Preparation Date: March, 2024 Step 1: Source Control BMP Checklist Source Control BMPs All development projects must implement source control BMPs 4.2.1 through 4.2.6 where applicable and feasible. See Chapter 4.2 and Appendix E of the City BMP Design Manual for information to implement source control BMPs shown in this checklist. Answer each category below pursuant to the following: "Yes" means the project will implement the source control BMP as described in Chapter 4.2 and/or Appendix E of the City BMP Design Manual. Discussion / justification must be provided and show locations on the project plans. Select applicable Source Controls in the Source Control BMP summary on the following page. "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion / justification must be provided. "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion / justification must be provided. Source Control Requirement Applied? 4.2.1 Prevention of Illicit Discharges into the MS4 ✓Yes ☐No ☐N/A Discussion / justification: Parking lot shall be swept regularly to prevent the accumulation of litter and debris. 4.2.2 Storm Drain Stenciling or Signage ✓ Yes ☐No ☐N/A Discussion / justification: Storm drain stenciling/signage are to be placed on proposed storm drain catch basins. Refer to the grading plan constructions notes at the time of construction document stage for locations of the proposed catch basins. 4.2.3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal ☐Yes ☐No ✓ N/A Discussion / justification: No outdoor material storage is proposed. 4.2.4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and Wind Dispersal ☐Yes ☐No ✓ N/A Discussion / justification: No outdoor work areas are proposed. 4.2.5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal ✓Yes ☐No ☐ N/A Discussion / justification: Trash enclosures to be maintained and protected during rainfall, run-on, runoff, and wind dispersal through covering or sweeping. 4.2.6 Additional BMPs Based on Potential Sources of Runoff Pollutants ✓ Yes ☐No ☐N/A Discussion / justification: Stormwater treatment device. 4 WQMP Template Date: October 31st, 2018 Preparation Date: March, 2024 Source Control BMP Summary Select all source control BMPs identified for your project in sections 4.2.1 through 4.2.6 above in the coulumn on the left below. Then select “yes” if the BMP has been implemented and shown on the project plans, “No” if the BMP has not been implemented, or “N/A” if the BMP is not applicable to your project. ☐ SC-A. On-site storm drain inlets ✓ Yes ☐No ☐N/A ☐ SC-B. Interior floor drains and elevator shaft sump pumps ☐Yes ☐No ✓ N/A ☐ SC-C. Interior parking garages ☐Yes ☐No ✓ N/A ☐ SC-D1. Need for future indoor & structural pest control ☐Yes ☐No ✓ N/A ☐ SC-D2. Landscape/outdoor pesticide use ✓ Yes ☐No ☐N/A ☐ SC-E. Pools, spas, ponds, fountains, and other water features ☐Yes ☐No ✓ N/A ☐ SC-F. Food service ☐Yes ☐No ✓ N/A ☐ SC-G. Refuse areas ☐Yes ☐No ✓ N/A ☐ SC-H. Industrial processes ☐Yes ☐No ✓ N/A ☐ SC-I. Outdoor storage of equipment or materials ☐Yes ☐No ✓ N/A ☐ SC-J. Vehicle and equipment cleaning ✓Yes ☐No ☐ N/A ☐ SC-K. Vehicle/equipment repair and maintenance ✓Yes ☐No ☐ N/A ☐ SC-L. Fuel dispensing areas ☐Yes ☐No ✓ N/A ☐ SC-M. Loading docks ✓Yes ☐No ☐ N/A ☐ SC-N. Fire sprinkler test water ✓Yes ☐No ☐ N/A ☐ SC-O. Miscellaneous drain or wash water ☐Yes ☐No ✓ N/A ☐ SC-P. Plazas, sidewalks, and parking lots ✓ Yes ☐No ☐N/A ☐ SC-Q. Large trash generating facilities ☐Yes ☐No ✓ N/A ☐ SC-R. Animal facilities ☐Yes ☐No ✓ N/A ☐ SC-S. Plant nurseries and garden centers ☐Yes ☐No ✓ N/A ☐ SC-T. Automotive facilities ☐Yes ☐No ✓ N/A Note: Show all source control measures applied above on the plan sheets. WQMP 5 Template Date: October 31st, 2018 Preparation Date: March, 2024 Step 2: Site Design BMP Checklist Site Design BMPs All development projects must implement site design BMPs SD-A through SD-H where applicable and feasible. See Chapter 4.3 and Appendix E of the City BMP Design Manual for information to implement site design BMPs shown in this checklist. Answer each category below pursuant to the following: "Yes" means the project will implement the site design BMP as described in Chapter 4.3 and/or Appendix E of the City BMP Design Manual. Discussion / justification must be provided and show locations on the project plans. "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion / justification must be provided. "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project site has no existing natural areas to conserve). Discussion / justification must be provided. Site Design Requirement Applied? 4.3.1 Maintain Natural Drainage Pathways and Hydrologic Features ✓Yes ☐No ☐ N/A Discussion / justification: The existing site is pre-developed with a building and parking lots. The modified site will work to mimic original hydrologic features and minimize major site feature modifications. 4.3.2 Conserve Natural Areas, Soils, and Vegetation ✓Yes ☐No ☐ N/A Discussion / justification: The existing site landscaping will be maintained, and additional landscaping will be provided. 4.3.3 Minimize Impervious Area ✓Yes ☐No ☐N/A Discussion / justification: The proposed development minimizes impervious areas to meet the needs of the development by utilizing landscaping. 4.3.4 Minimize Soil Compaction ✓Yes ☐No ☐N/A Discussion / justification: Minimize soil compaction in the landscape areas to preserve natural infiltration capacity. 4.3.5 Impervious Area Dispersion ✓Yes ☐No ☐N/A Discussion / justification: Runoff from the parking lot will be directed towards storm inlets for treatment. 4.3.6 Runoff Collection ☐Yes ✓ No ☐N/A Discussion / justification: The project site will provide means of treatment and collection of runoff through an underground stormwater treatment system. 4.3.7 Landscaping with Native or Drought Tolerant Species ✓Yes ☐No ☐N/A Discussion / justification: The proposed landscape areas will primarily consist of native and/or drought tolerant plant species (low water use plants). The water use for the proposed landscape area will comply with the City of Temecula irrigation Guidelines. 6 WQMP Template Date: October 31st, 2018 Preparation Date: March, 2024 4.3.8 Harvesting and Using Precipitation ☐Yes ✓ No ☐N/A Discussion / justification: Harvest and use features within the project are not technically feasible and appreciable due to insufficient harvested water demand. On-site landscape areas are anticipated to be more than 20% of the total site area. Step 3: Construction Stormwater BMP Checklist Minimum Required Standard Construction Stormwater BMPs If you answer “Yes” to any of the questions below, your project is subject to Table 1 on the following page (Minimum Required Standard Construction Stormwater BMPs). As noted in Table 1, please select at least the minimum number of required BMPs1, or as many as are feasible for your project. If no BMP is selected, an explanation must be given in the box provided. The following questions are intended to aid in determining construction BMP requirements for your project. Note: All selected BMPs below must be included on the BMP plan incorporated into the construction plan sets. 1. Will there be soil disturbing activities that will result in exposed soil areas? (This includes minor grading and trenching.) Reference Table 1 Items A, B, D, and E Note: Soil disturbances NOT considered significant include, but are not limited to, change in use, mechanical/electrical/plumbing activities, signs, temporary trailers, interior remodeling, and minor tenant improvement. ✓Yes ☐No 2. Will there be asphalt paving, including patching? Reference Table 1 Items D and F ✓Yes ☐No 3. Will there be slurries from mortar mixing, coring, or concrete saw cutting? Reference Table 1 Items D and F ✓Yes ☐ No 4. Will there be solid wastes from concrete demolition and removal, wall construction, or form work? Reference Table 1 Items D and F ✓Yes ☐No 5. Will there be stockpiling (soil, compost, asphalt, concrete, solid waste) for over 24 hours? Reference Table 1 Items D and F ✓Yes ☐No 6. Will there be dewatering operations? Reference Table 1 Items C and D ☐Yes ✓ No 7. Will there be temporary on-site storage of construction materials, including mortar mix, raw landscaping, and soil stabilization materials, treated lumber, rebar, and plated metal fencing materials? Reference Table 1 Items E and F ✓Yes ☐No 8. Will trash or solid waste product be generated from this project? Reference Table 1 Item F ☐Yes ✓ No 9. Will construction equipment be stored on site (e.g.: fuels, oils, trucks, etc.?) Reference Table 1 Item F ✓Yes ☐No 10. Will Portable Sanitary Services (“Porta-potty”) be used on the site? Reference Table 1 Item F ✓Yes ☐No 1 Minimum required BMPs are those necessary to comply with the City of Temecula Erosion and Sediment Control Ordinance (Chapter 18.18 et seq.) and the City of Temecula Engineering and Construction Manual (Chapter 18). WQMP 7 Template Date: October 31st, 2018 Preparation Date: March, 2024 Table 1. Construction Stormwater BMP Checklist Minimum Required Best Management Practices (BMPs) CALTRANS SW Handbook2 Detail BMP Selected Reference sheet No.’s where each selected BMP is shown on the plans. If no BMP is selected, an explanation must be provided. A. Select Erosion Control Method for Disturbed Slopes (choose at least one for the appropriate season) Vegetation Stabilization Planting3 (Summer) SS-2, SS-4 ☐ Hydraulic Stabilization Hydroseeding2 (Summer) SS-4 ✓ Bonded Fiber Matrix or Stabilized Fiber Matrix4 (Winter) SS-3 ☐ Physical Stabilization Erosion Control Blanket3 (Winter) SS-7 ☐ B. Select erosion control method for disturbed flat areas (slope < 5%) (choose at least one) Will use erosion control measures from Item A on flat areas also SS-3, 4, 7 ✓ Sediment Desilting Basin (must treat all site runoff) SC-2 ☐ Mulch, straw, wood chips, soil application SS-6, SS-8 ☐ 2 State of California Department of Transportation (Caltrans). 2003. Storm Water Quality Handbooks, Construction Site Best Management Practices (BMPs) Manual. March. Available online at: http://www.dot.ca.gov/hq/construc/stormwater/manuals.htm. 3 If Vegetation Stabilization (Planting or Hydroseeding) is proposed for erosion control it may be installed between May 1st and August 15th. Slope irrigation is in place and needs to be operable for slopes >3 feet. Vegetation must be watered and established prior to October 1st. The owner must implement a contingency physical BMP by August 15th if vegetation establishment does not occur by that date. If landscaping is proposed, erosion control measures must also be used while landscaping is being established. Established vegetation must have a subsurface mat of intertwined mature roots with a uniform vegetative coverage of 70 percent of the natural vegetative coverage or more on all disturbed areas. 4 All slopes over three feet must have established vegetative cover prior to final permit approval. 8 WQMP Template Date: October 31st, 2018 Preparation Date: March, 2024 Table 1. Construction Stormwater BMP Checklist (continued) Minimum Required Best Management Practices (BMPs) CALTRANS SW Handbook Detail BMP Selected Reference sheet No.’s where each selected BMP is shown on the plans. If no BMP is selected, an explanation must be provided. C. If runoff or dewatering operation is concentrated, velocity must be controlled using an energy dissipater Energy Dissipater Outlet Protection5 SS-10 ☐ D. Select sediment control method for all disturbed areas (choose at least one) Silt Fence SC-1 ✓ Fiber Rolls (Straw Wattles) SC-5 ☐ Gravel & Sand Bags SC-6 & 8 ☐ Dewatering Filtration NS-2 ☐ Storm Drain Inlet Protection SC-10 ☐ Engineered Desilting Basin (sized for 10-year flow) SC-2 ☐ E. Select method for preventing offsite tracking of sediment (choose at least one) Stabilized Construction Entrance TC-1 ✓ Construction Road Stabilization TC-2 ☐ Entrance/Exit Tire Wash TC-3 ✓ Entrance/Exit Inspection & Cleaning Facility TC-1 ☐ Street Sweeping and Vacuuming SC-7 ☐ F. Select the general site management BMPs F.1 Materials Management Material Delivery & Storage WM-1 ✓ Spill Prevention and Control WM-4 ☐ F.2 Waste Management6 Waste Management Concrete Waste Management WM-8 ✓ Solid Waste Management WM-5 ✓ Sanitary Waste Management WM-9 ☐ Hazardous Waste Management WM-6 ✓ Note: The Construction General Permit (Order No. 2009-0009-DWQ) also requires all projects not subject to the BMP Design Manual to comply with runoff reduction requirements through the implementation of post-construction BMPs as described in Section XIII of the order. 5 Regional Standard Drawing D-40 – Rip Rap Energy Dissipater is also acceptable for velocity reduction. 6 Not all projects will have every waste identified. The applicant is responsible for identifying wastes that will be onsite and applying the appropriate BMP. For example, if concrete will be used, BMP WM-8 must be selected. WQMP 9 Template Date: October 31st, 2018 Preparation Date: March, 2024 Step 4: Project type determination (Standard or Priority Development Project) Is the project part of another Priority Development Project (PDP)?☐ Yes ✓ No If so, Standard and PDP requirements apply. Go to Step 4.1 and select “PDP” The project is (select one):☐ New Development ✓ Redevelopment7 The total proposed newly created or replaced impervious area is: 28,041 ft2 The total existing (pre-project) impervious area is: 114,073 ft2 The total area disturbed by the project is: 28,915 ft2 If the total area disturbed by the project is 1 acre (43,560 sq. ft.) or more OR the project is part of a larger common plan of development disturbing 1 acre or more, a Waste Discharger Identification (WDID) number must be obtained from the State Water Resources Control Board. WDID: 9 33C404872 Is the project in any of the following categories, (a) through (f)?8 Yes ☐ No ✓ (a) New development projects that create 10,000 square feet or more of impervious surfaces 9(collectively over the entire project site). This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. Yes ✓ No ☐ (b) Redevelopment projects that create and/or replace 5,000 square feet or more of impervious surface (collectively over the entire project site on an existing site of 10,000 square feet or more of impervious surfaces). This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. Yes ✓ No ☐ (c) New and redevelopment projects that create and/or replace 5,000 square feet or more of impervious surface (collectively over the entire project site), and support one or more of the following uses: (i) Restaurants. This category is defined as a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812). (ii) Hillside development projects. This category includes development on any natural slope that is twenty-five percent or greater. (iii) Parking lots. This category is defined as a land area or facility for the temporary parking or storage of motor vehicles used personally, for business, or for commerce. (iv) Streets, roads, highways, freeways, and driveways. This category is defined as any paved impervious surface used for the transportation of automobiles, trucks, motorcycles, and other vehicles. 7 Redevelopment is defined as: The creation and/or replacement of impervious surface on an already developed site. Examples include the expansion of a building footprint, road widening, the addition to or replacement of a structure, and creation or addition of impervious surfaces. Replacement of impervious surfaces includes any activity that is not part of a routine maintenance activity where impervious material(s) are removed, exposing underlying soil during construction. Redevelopment does not include routine maintenance activities, such as trenching and resurfacing associated with utility work; pavement grinding; resurfacing existing roadways; new sidewalks construction; pedestrian ramps; or bike lanes on existing roads; and routine replacement of damaged pavement, such as pothole repair. 8 Applicants should note that any development project that will create and/or replace 10,000 square feet or more of impervious surface (collectively over the entire project site) is considered a new development. 43,032 28,374 43,032 113,209 48,032 38,669 10 WQMP Template Date: October 31st, 2018 Preparation Date: March, 2024 Project type determination (continued) Yes ☐ No ✓ (d) New or redevelopment projects that create and/or replace 2,500 square feet or more of impervious surface (collectively over the entire project site), and discharging directly to an Environmentally Sensitive Area (ESA). “Discharging directly to” includes flow that is conveyed overland a distance of 200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolated flow from the project to the ESA (i.e. not commingled with flows from adjacent lands). Note: ESAs are areas that include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Board and San Diego Water Board; State Water Quality Protected Areas; water bodies designated with the RARE beneficial use by the State Water Board and San Diego Water Board; and any other equivalent environmentally sensitive areas which have been identified by the Copermittees. See BMP Design Manual Chapter 1.4.2 for additional guidance. Yes ✓ No ☐ (e) New development projects, or redevelopment projects that create and/or replace 5,000 square feet or more of impervious surface, that support one or more of the following uses: (i) Automotive repair shops. This category is defined as a facility that is categorized in any one of the following SIC codes: 5013, 5014, 5541, 7532-7534, or 7536- 7539. (ii) Retail gasoline outlets (RGOs). This category includes RGOs that meet the following criteria: (a) 5,000 square feet or more or (b) a projected Average Daily Traffic (ADT) of 100 or more vehicles per day. Yes ✓ No ☐ (f) New or redevelopment projects that result in the disturbance of one or more acres of land and are expected to generate pollutants post construction. Note: See BMP Design Manual Chapter 1.4.2 for additional guidance. Does the project meet the definition of one or more of the Priority Development Project categories (a) through (f) listed above? ☐ No – the project is not a Priority Development Project (Standard Project). ✓ Yes – the project is a Priority Development Project (PDP). Further guidance may be found in Chapter 1 and Table 1-2 of the BMP Design Manual. The following is for redevelopment PDPs only: The area of existing (pre-project) impervious area at the project site is: _114,073_ ft2 (A) The total proposed newly created or replaced impervious area is _28,041_ ft2 (B) Percent impervious surface created or replaced (B/A)*100: _24.6_ % The percent impervious surface created or replaced is (select one based on the above calculation): ✓ less than or equal to fifty percent (50%) – only newly created or replaced impervious areas are considered a PDP and subject to stormwater requirements OR ☐ greater than fifty percent (50%) – the entire project site is considered a PDP and subject to stormwater requirements 113,209 28,374 25.1 38,669 34.2 WQMP 11 Template Date: October 31st, 2018 Preparation Date: March, 2024 Step 4.1: Water Quality Management Plan requirements Step Answer Progression Is the project a Standard Project, Priority Development Project (PDP), or exception to PDP definitions? To answer this item, complete Step 4 Project Type Determination Checklist, and see PDP exemption information below. For further guidance, see Chapter 1.4 of the BMP Design Manual in its entirety. ☐ Standard Project Standard Project requirements apply, STOP, you have satisfied stormwater requirements. ✓ PDP Standard and PDP requirements apply. Complete Exhibit A “PDP Requirements.” http://temeculaca.gov/wqmpa2 ☐ PDP Exemption Go to Step 4.2 below. Step 4.2: Exemption to PDP definitions Is the project exempt from PDP definitions based on either of the following: ☐ Projects that are only new or retrofit paved sidewalks, bicycle lanes, or trails that meet the following criteria: (i) Designed and constructed to direct stormwater runoff to adjacent vegetated areas, or other non-erodible permeable areas; OR (ii) Designed and constructed to be hydraulically disconnected from paved streets or roads [i.e., runoff from the new improvement does not drain directly onto paved streets or roads]; OR (iii) Designed and constructed with permeable pavements or surfaces in accordance with City of Temecula Guidance on Green Infrastructure; If so: Standard Project requirements apply, AND any additional requirements specific to the type of project. City concurrence with the exemption is required. Provide discussion and list any additional requirements below in this form. STOP, you have satisfied stormwater requirements. ☐ Projects that are only retrofitting or redeveloping existing paved alleys, streets or roads that are designed and constructed in accordance with the City of Temecula Guidance on Green Infrastructure. Complete Exhibit A “PDP Requirements.” Select Green Streets Exemptions where applicable. Discussion / justification, and additional requirements for exceptions to PDP definitions, if applicable: Exhibit A City of Temecula PRIORITY DEVELOPMENT PROJECT REQUIREMENTS ii PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 Preparer's Certification Page Project Name: Tesla Temecula Repair Facility Permit Application Number: PA24-0069 PREPARER'S CERTIFICATION I hereby declare that I am the Engineer in Responsible Charge of design of Stormwater best management practices (BMPs) for this project, and that I have exercised responsible charge over the design of the BMPs as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the PDP requirements of the City of Temecula BMP Design Manual, which is a design manual for compliance with local City of Temecula Stormwater and Urban Runoff Management and Discharge Controls Ordinance (Chapter 8.28 et seq.) and regional MS4 Permit (California Regional Water Quality Control Board Sa n Diego Region Order No. R9-2013-0001 as amended by R9-2015-0001 and R9 -2015-0100) requirements for stormwater management. I have read and understand that the City of Temecula has adopted minimum requirements for managing urban runoff, including stormwater, from land development activities, as described in the BMP Design Manual. I certify that this PDP WQMP has been completed to the best of my ability and accurately reflects the project bei ng proposed and the applicable BMPs proposed to minimize the potentially negative impacts of this project's land developme nt activities on water quality. I understand and acknowledge that the plan check review of this PDP WQMP by City staff is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of stormwater BMPs for this project, of my responsibilities for project design. Engineer of Work's Signature, PE Number & Expiration Date Thomas Kim Print Name Kimley-Horn and Associates Company & Phone No. (714) 939-1030 Date Engineer's Seal: C 90376 09/30/2025 LD24-2361 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 3 Template Date: August 14th, 2022 Preparation Date: March, 2024 Step 1: Site Information Checklist Description of Existing Site Condition and Drainage Patterns Project Watershed (Complete Hydrologic Unit, Area, and Subarea Name with Numeric Identifier; e.g., 902.52 Santa Margarita HU, Pechanga HA, Wolf HSA) 902.32 Murrieta HSA Current Status of the Site (select all that apply): ✓ Existing development ☐ Previously graded but not built out ☐ Demolition completed without new construction ☐ Agricultural or other non-impervious use ☐ Vacant, undeveloped/natural Description / Additional Information: Existing building, landscaping, parking lot, and dirt areas. Existing Land Cover Includes (select all that apply and provide each area on site): ✓ Pervious Area 0.81 Acres (35,159 Square Feet) ✓ Impervious Areas 2.33 Acres (101,578 Square Feet) Description / Additional Information: Impervious areas include existing building, concrete and asphalt pavement areas. Pervious areas include existing landscaping and dirt areas. How is stormwater runoff conveyed from the site? At a minimum, this description should answer: (1) Whether existing drainage conveyance is natural or urban; (2) Is runoff from offsite conveyed through the site? If yes, describe the offsite drainage areas, design flows, and locations where offsite flows enter the project site, and summarize how such flows are conveyed through the site; (3) Provide details regarding existing project site drainage conveyance network, including any existing storm drains, concrete channels, swales, detention facilities, stormwater treatment facilities, natural or constructed channels; and (4) Identify all discharge locations from the existing project site along with a summary of conveyance system size and capacity for each of the discharge locations. Provide summary of the pre-project drainage areas and design flows to each of the existing runoff discharge locations. Reference the Drainage report Attachment for detailed calculations. Describe existing site drainage patterns: Existing site drainage is through an existing gutter that daylights to an existing vegetated swale the South and to the existing road in the Northeast. 4 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 Description of Proposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: Proposed work includes improvements to the existing building, new concrete pavement, new asphalt pavement, and new landscape areas. Proposed Land Cover Includes (select all that apply and provide each area on site): Existing to Remain ✓ Pervious Area 21,621 Acres (0.50 Square Feet) ✓ Impervious Areas 86,032 Acres (1.97 Square Feet) Existing to Be Replaced ✓ Pervious Area 1,194 Acres (0.03 Square Feet) ✓ Impervious Areas 12,318 Acres (0.28 Square Feet) Newly Created ✓ Pervious Area 6,100 Acres (0.14 Square Feet) ✓ Impervious Areas 15,723 Acres (0.36 Square Feet) Total ✓ Pervious Area 28,915 Acres (0.66 Square Feet) ✓ Impervious Areas 114,073 Acres (2.62 Square Feet) Description / Additional Information: List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): Features include: • Parking Lot • Trash Enclosure • Employee Break Area • Accessible Path of Travel • Commercial Driveway • Sidewalk • Pad for ATU Units List/describe proposed pervious features of the project (e.g., landscape areas): Features include: • Landscape Islands • Landscaping Areas Describe any grading or changes to site topography: Changes to existing grading mainly pertains to the new curb, sidewalk, gutter, and other impervious features. Additional grading changes applies as a new catch basin. 28,374 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 5 Template Date: August 14th, 2022 Preparation Date: March, 2024 Provide details regarding the proposed project site drainage conveyance network, including storm drains, concrete channels, swales, detention facilities, stormwater treatment facilities, natural or constructed channels, and the method for conveying offsite flows through or around the proposed project site. Identify all discharge locations from the proposed project site along with a summary of the conveyance system size and capacity for each of the discharge locations. Provide a summary of pre - and post-project drainage areas and design flows to each of the runoff discharge locations. Reference the drainage study for detailed calculations. Describe proposed site drainage patterns: Proposed drainage pattern operates as follows: Stormwater drains Northeast and Southwest at a ridge point on site. Water streaming Northeast will follow the existing gutter to a catch basin near the driveway. Water streaming Southwest will follow the existing gutter to a drop inlet. Both inlets will direct stream to a modular wetland system for treatment and retention. The Overflow will be directed to a sump pump that will overflow to a park drain. Refer to the drainage memo for more information. 6 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 Description of Receiving Water(s) and Pollutants of Concern Describe flow path of stormwater from the project site discharge location(s), through urban storm conveyance systems as applicable, to receiving creeks, rivers, and lagoons as applicable, and ultimate discharge to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable): Stormwater discharges into the existing vegetated swale to the South. The flow then travels through city storm conveyance channel and discharges into the Murrieta creek. The flow then travels through the Santa Margarita River and into its ultimate discharge to the Pacific Ocean. List any 303(d) impaired water bodies1 within the path of stormwater from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the pollutant(s)/stressor(s) causing impairment, and identify any TMDLs and/or Highest Priority Pollutants from the WQIP for the impaired water bodies (see BMP Design Manual Appendix B.6.1 ): 303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs / WQIP Highest Priority Pollutant Murrieta Creek Bifenthrin, Chlorpyrifos, Cyhalothrin, Lambda, Copper, Indicator Bacteria, Iron, Manganese, Mercury, Nitrogen, Dissolved Oxygen, Phosphorus, Pyrethroids Chlorpyrifos Santa Margarita River Bifenthrin, Cyhalothrin, Lambda, Indicator Bacteria, Iron, Manganese, Nitrogen, Phosphorus, Pyrethroids, Dissolved Solids Indicator Bacteria Pacific Ocean N/A 2-Methylnaphthalene Identify pollutants expected from the project site based on all proposed use(s) of the site (see BMP Design Manual Appendix B.6 .): Pollutant Not Applicable to the Project Site Anticipated from the Project Site Also a Receiving Water Pollutant of Concern Sediment ✓ ☐ ☐ Nutrients ✓ ☐ ☐ Heavy Metals ✓ ☐ ☐ Organic Compounds ✓ ☐ ☐ Trash & Debris ✓ ☐ ☐ Oxygen Demanding Substances ✓ ☐ ☐ Oil & Grease ✓ ☐ ☐ Bacteria & Viruses ✓ ☐ ☐ Pesticides ✓ ☐ ☐ 1 The current list of Section 303(d) impaired water bodies can be found at http://www.waterboards.ca.gov/water_issues/programs/water_quality_assessment/#impaired PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 7 Template Date: August 14th, 2022 Preparation Date: March, 2024 Site Requirements and Constraints The following is for redevelopment PDPs only: The area of existing (pre-project) impervious area at the project site is: 114,073 ft2 (A) The total proposed newly created or replaced impervious area is 28,041 ft2 (B) Percent impervious surface created or replaced (B/A)*100: 24.6 % The percent impervious surface created or replaced is (select one based on the above calculation): ✓ less than or equal to fifty percent (50%) – only newly created or replaced impervious areas are considered a PDP and subject to stormwater requirements OR ☐ greater than fifty percent (50%) – the entire project site is considered a PDP and subject to stormwater requirements List applicable site requirements or constraints that will influence stormwater management design, such as zoning requirements including setbacks and open space, or local codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements: Not Applicable Optional Additional Information or Continuation of Previous Sections As Needed This space provided for additional information or continuation of information from previous sections as needed. 113,209 28,374 25.1 8 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 Step 2: Strategy for Meeting PDP Performance Requirements PDPs must implement BMPs to control pollutants in stormwater that may be discharged from a project (see Chapter 5). PDPs subject to hydromodification management requirements must implement flow control BMPs to manage hydromodification (see Chapter 6). Both stormwater pollutant control and flow control can be achieved within the same BMP(s). Projects triggering the 50% rule must address stormwater requirements for the entire site. Structural BMPs must be verified by the City at the completion of construction. This may include requiring the project owner or project owner's representative and engineer of record to certify construction of the structural BMPs (see Chapter 1.12). Structural BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Chapter 7). Provide a narrative description of the general strategy for pollutant control and flow control at the project site in the box below. This information must describe how the steps for selecting and designing stormwater pollutant control BMPs presented in Chapter 5.1 of the BMP Design Manual were followed, and the results (type of BMPs selected). For projects requiring flow control BMPs, indicate whether pollutant control and flow control BMPs are integrated or separate. At the end of this discussion, provide a summary of all the BMPs within the project including the type and number. Describe the general strategy for BMP implementation at the site. Per the Geotechnical Report in Attachment 3, the percolation rates measured onsite were very low. Therefore, infiltration BMPs were considered infeasible. In addition, harvest and use BMPs were determined to be infeasible due to insufficient demand. Since infiltration and harvest and use BMPs are infeasible for this site, the project will utilize biofiltration BMPs for stormwater treatment. Stormwater runoff is proposed to mainly be collected by nearby storm inlets in the southwest and northeast to be conveyed to a Modular Wetland System for treatment. Treated runoff will be discharged into the existing storm drain system running across the site. In case of large storm events, excess runoff above the water quality volume will bypass the Modular Wetland System and discharged into the existing storm drain system. Refer to the Post-Development Exhibit in Attachment 1a for more information. As mentioned previously, the project utilizes a Modular Wetland System as a flow control BMP which will serve to mitigate peak flows. PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 9 Template Date: August 14th, 2022 Preparation Date: March, 2024 ATTACHMENT 1 STORMWATER POLLUTANT CONTROL BMP SELECTION Indicate which Items are Included behind this cover sheet: Attachment Sequence Contents Checklist Special Considerations for Redevelopment Projects (50% Rule) see chapter 1.7 and Step 1.3 ✓ Less than or equal to fifty percent (50%) ☐ Greater than fifty percent (50%) Refer to Figure 5-1: Stormwater Pollutant Control BMP Selection Flow Chart Attachment 1a DMA Exhibit (Required) See DMA Exhibit Checklist on the back of this form. See Chapter 3.3.3 for guidance ✓ Included ☐ Entire project is designed with Self-Mitigating and De-Minimis DMAs. The project is compliant with Pollution Control BMP sizing requirements. STOP * Attachment 1b Figure B.1-1: 85th Percentile 24-hour Isohyetal Map with project location ✓ Included Attachment 1c Worksheet B.3-1 Structural BMP Feasibility: Project-Scale BMP Feasibility Analysis ✓ Included Attachment 1d Worksheet B.2-1 DCV 2 ✓ Included Attachment 1e Applicable Site Design BMP Fact Sheet(s) from Appendix E ✓ Included ☐ Entire project is designed with Self-Retaining DMAs. The project is compliant with Pollution Control BMP sizing requirements. STOP * Attachment 1f Structural BMP Inventory ✓ Included Attachment 1g Structural Pollutant Control BMP Checklist for each Structural BMP ✓ Included Attachment 1h Is Onsite Alternative Compliance proposed?3 ✓ No ☐ Yes - Include WQE worksheets Attachment 1i Offsite Alternative Compliance Participation Form - Pollutant Control Refer to Figure 1-3: Pathways to Participating in Offsite Alternative Compliance Program ✓ Full Compliance Onsite ☐ Partial Compliance Onsite with Offsite Alternative Compliance or Full Offsite Alternative Compliance. Document onsite structural BMPs and complete - Pollutant Control Offsite Alternative Compliance Participation Form, and - WQE worksheets * If this box is checked, the remainder of Attachment 1 does not need to be filled out. 2 All stormwater pollutant control worksheets have been automated and are available for download at: https://www.sandiegocounty.gov/content/sdc/dpw/watersheds/DevelopmentandConstruction/BMP_Design_Manual. html 3 Water Quality Equivalency Guidance and automated worksheets for Region 9: http://www.projectcleanwater.org/water-quality-equivalency-guidance/ 10 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 Attachment 1a: DMA Exhibit Checklist See Chapter 3.3.3 for guidance ☐ Point(s) of Compliance ✓ Project Site Boundary ✓ Project Disturbed Area Footprint ✓ Drainage management area (DMA) boundaries, DMA ID numbers, DMA areas (square footage or acreage), DMA land use and pollutants of concern, and DMA type (i.e., drains to structural BMP, self-retaining, self-mitigating, or de-minimis) Note on exhibit de-minimis areas and discuss reason they could not be included in Step 1.3 per section 5.2.2 of the manual. Include offsite areas receiving treatment to mitigate Onsite Water Quality Equivalency. ✓ Include summary table of worksheet inputs for each DMA. ✓ Include description of self-mitigating areas. ☐ Potential pollutant source areas and corresponding required source control BMPs (see Chapter 4, Appendix E.1, and Step 3.5) – Not Applicable ✓ Proposed Site Design BMPs and surface treatments used to minimize imperviousness . Show sections, details, and dimensions of site design BMP’s per chapter 5.2.3 (tree wells, dispersion areas, rain gardens, permeable pavement, rain barrels, green roofs, etc.) ☐ Proposed Harvest and Use BMPs – Not Applicable ✓ Underlying hydrologic soil group (Web Soil Survey) ✓ Existing natural hydrologic features (watercourses, seeps, springs, wetlands, pond, lake) ✓ Existing topography and impervious areas ✓ Proposed grading and impervious areas. If the project is a subdivision or spans multiple lots show pervious and impervious totals for each lot. ✓ Existing and proposed site drainage network and connections to drainage offsite ☐ Potable water wells, onsite wastewater treatment systems (septic), underground utilities ✓ Structural BMPs (identify location, structural BMP ID No., type of BMP, and size/detail) ✓ Approximate depth to groundwater at each structural BMP ✓ Approximate infiltration rate and feasibility (full retention, partial retention, biofiltration) at each structural BMP ☐ Critical coarse sediment yield areas to be protected and or conveyed through the project site, if applicable. – Not Applicable ☐ Temporary Construction BMPs. Include protection of source control, site design and structural BMPs during construction. – See Erosion and Sediment Control Plan DIAZ RD A3 0.02 A5 0.02 A2 0.11 A1 0.32 A6 0.06 A4 0.50 CITY OF TEMECULA POST DEVELOPMENT WQMP EXHIBIT FOR TESLA REPAIR FACILITY CITY OF TEMECULA 1© NO R T H TESLA REPAIR FACILITY POST-DEVELOPMENT WQMP EXHIBIT 27635 DIAZ ROAD WQMP SUMMARY HYDROLOGY INFORMATION LEGEND: X X.XX DRAINAGE NOTES: PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 11 Template Date: August 14th, 2022 Preparation Date: March, 2024 Attachment 1b: 85th Percentile 24-hour Isohyetal Map with project location RIVERSIDE COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT Isohyetal Map for the 85th Percentile 24 hour Storm Event July 2011 Rain Gage Locations Proposed Site Location = 0.90 12 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 Attachment 1c: Worksheet B.3-1 Structural BMP Feasibility: Project-Scale BMP Feasibility Analysis Category #Description i ii iii iv v vi vii viii ix x Units 1 Drainage Basin ID or Name A1-A4, A6 ---------sq-ft 2 Design Infiltration Rate Recommended 0.000 ---------in/hr 3 Design Capture Volume Tributary to BMP 2,522 ---------cubic-feet 4 Is BMP Vegetated or Unvegetated?Vegetated unitless 5 Is BMP Impermeably Lined or Unlined?Lined unitless 6 Does BMP Have an Underdrain?Underdrain unitless 7 Does BMP Utilize Standard or Specialized Media?Specialized unitless 8 Provided Surface Area 36 sq-ft 9 Provided Surface Ponding Depth 3 inches 10 Provided Soil Media Thickness 29 inches 11 Provided Gravel Thickness (Total Thickness)6 inches 12 Underdrain Offset 0 inches 13 Diameter of Underdrain or Hydromod Orifice (Select Smallest)6.00 inches 14 Specialized Soil Media Filtration Rate 301.00 in/hr 15 Specialized Soil Media Pore Space for Retention 0.35 unitless 16 Specialized Soil Media Pore Space for Biofiltration 0.35 unitless 17 Specialized Gravel Media Pore Space 0.40 unitless 18 Volume Infiltrated Over 6 Hour Storm 0 0 0 0 0 0 0 0 0 0 cubic-feet 19 Ponding Pore Space Available for Retention 0.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 unitless 20 Soil Media Pore Space Available for Retention 0.35 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 unitless 21 Gravel Pore Space Available for Retention (Above Underdrain)0.00 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 unitless 22 Gravel Pore Space Available for Retention (Below Underdrain)0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 unitless 23 Effective Retention Depth 10.15 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 inches 24 Fraction of DCV Retained (Independent of Drawdown Time)0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ratio 25 Calculated Retention Storage Drawdown Time 120 0 0 0 0 0 0 0 0 0 hours 26 Efficacy of Retention Processes 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ratio 27 Volume Retained by BMP (Considering Drawdown Time)30 0 0 0 0 0 0 0 0 0 cubic-feet 28 Design Capture Volume Remaining for Biofiltration 2,492 0 0 0 0 0 0 0 0 0 cubic-feet 29 Max Hydromod Flow Rate through Underdrain 1.6146 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 cfs 30 Max Soil Filtration Rate Allowed by Underdrain Orifice 1,937.53 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 in/hr 31 Soil Media Filtration Rate per Specifications 301.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 in/hr 32 Soil Media Filtration Rate to be used for Sizing 301.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 in/hr 33 Depth Biofiltered Over 6 Hour Storm 1806.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 inches 34 Ponding Pore Space Available for Biofiltration 1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 35 Soil Media Pore Space Available for Biofiltration 0.35 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 unitless 36 Gravel Pore Space Available for Biofiltration (Above Underdrain)0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 unitless 37 Effective Depth of Biofiltration Storage 15.55 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 inches 38 Drawdown Time for Surface Ponding 0 0 0 0 0 0 0 0 0 0 hours 39 Drawdown Time for Effective Biofiltration Depth 0 0 0 0 0 0 0 0 0 0 hours 40 Total Depth Biofiltered 1821.55 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 inches 41 Option 1 - Biofilter 1.50 DCV: Target Volume 3,737 0 0 0 0 0 0 0 0 0 cubic-feet 42 Option 1 - Provided Biofiltration Volume 3,737 0 0 0 0 0 0 0 0 0 cubic-feet 43 Option 2 - Store 0.75 DCV: Target Volume 1,869 0 0 0 0 0 0 0 0 0 cubic-feet 44 Option 2 - Provided Storage Volume 47 0 0 0 0 0 0 0 0 0 cubic-feet 45 Portion of Biofiltration Performance Standard Satisfied 1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ratio 46 Do Site Design Elements and BMPs Satisfy Annual Retention Requirements?Yes ---------yes/no 47 Overall Portion of Performance Standard Satisfied (BMP Efficacy Factor)1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ratio 48 Deficit of Effectively Treated Stormwater 0 n/a n/a n/a n/a n/a n/a n/a n/a n/a cubic-feet Biofiltration Calculations False - BMPs sized at <3% of the effective tributary areas must be accompanied by Reduced Size BMP Maintenance calculations (see last tab). False False Result False -Use of specialized or proprietary media requires submittal of supplemental information outlined in Appendix F of the BMPDM. Attention! Retention Calculations Automated Worksheet B.3: BMP Performance (V2.0) False False BMP Inputs PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 13 Template Date: August 14th, 2022 Preparation Date: March, 2024 Attachment 1d: Worksheet B.2-1 DCV Category # Description i ii iii iv v vi vii viii ix x Units 0 Drainage Basin ID or Name A1-A4, A6 unitless 1 Basin Drains to the Following BMP Type Biofiltration unitless 2 85th Percentile 24-hr Storm Depth 0.90 inches 3 Design Infiltration Rate Recommended by Geotechnical Engineer 0.050 in/hr 4 Impervious Surfaces Not Directed to Dispersion Area (C=0.90) 36,455 sq-ft 5 Semi-Pervious Surfaces Not Serving as Dispersion Area (C=0.30)0 sq-ft 6 Engineered Pervious Surfaces Not Serving as Dispersion Area (C=0.10)6,660 sq-ft 7 Natural Type A Soil Not Serving as Dispersion Area (C=0.10)0 sq-ft 8 Natural Type B Soil Not Serving as Dispersion Area (C=0.14)0 sq-ft 9 Natural Type C Soil Not Serving as Dispersion Area (C=0.23)0 sq-ft 10 Natural Type D Soil Not Serving as Dispersion Area (C=0.30)0 sq-ft 11 Does Tributary Incorporate Dispersion, Tree Wells, and/or Rain Barrels?No No No No No No No No No No yes/no 12 Impervious Surfaces Directed to Dispersion Area per SD-B (Ci=0.90) sq-ft 13 Semi-Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.30)sq-ft 14 Engineered Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.10)sq-ft 15 Natural Type A Soil Serving as Dispersion Area per SD-B (Ci=0.10)sq-ft 16 Natural Type B Soil Serving as Dispersion Area per SD-B (Ci=0.14)sq-ft 17 Natural Type C Soil Serving as Dispersion Area per SD-B (Ci=0.23)sq-ft 18 Natural Type D Soil Serving as Dispersion Area per SD-B (Ci=0.30)sq-ft 19 Number of Tree Wells Proposed per SD-A # 20 Average Mature Tree Canopy Diameter ft 21 Number of Rain Barrels Proposed per SD-E # 22 Average Rain Barrel Size gal 23 Does BMP Overflow to Stormwater Features in Downstream Drainage?No No No No No No No No No No unitless 24 Identify Downstream Drainage Basin Providing Treatment in Series unitless 25 Percent of Upstream Flows Directed to Downstream Dispersion Areas percent 26 Upstream Impervious Surfaces Directed to Dispersion Area (Ci=0.90)0 0 0 0 0 0 0 0 0 0 cubic-feet 27 Upstream Impervious Surfaces Not Directed to Dispersion Area (C=0.90)0 0 0 0 0 0 0 0 0 0 cubic-feet 28 Total Tributary Area 43,115 0 0 0 0 0 0 0 0 0 sq-ft 29 Initial Runoff Factor for Standard Drainage Areas 0.78 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 30 Initial Runoff Factor for Dispersed & Dispersion Areas 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 31 Initial Weighted Runoff Factor 0.78 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 32 Initial Design Capture Volume 2,522 0 0 0 0 0 0 0 0 0 cubic-feet 33 Total Impervious Area Dispersed to Pervious Surface 0 0 0 0 0 0 0 0 0 0 sq-ft 34 Total Pervious Dispersion Area 0 0 0 0 0 0 0 0 0 0 sq-ft 35 Ratio of Dispersed Impervious Area to Pervious Dispersion Area n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a ratio 36 Adjustment Factor for Dispersed & Dispersion Areas 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 ratio 37 Runoff Factor After Dispersion Techniques 0.78 n/a n/a n/a n/a n/a n/a n/a n/a n/a unitless 38 Design Capture Volume After Dispersion Techniques 2,522 0 0 0 0 0 0 0 0 0 cubic-feet 39 Total Tree Well Volume Reduction 0 0 0 0 0 0 0 0 0 0 cubic-feet 40 Total Rain Barrel Volume Reduction 0 0 0 0 0 0 0 0 0 0 cubic-feet 41 Final Adjusted Runoff Factor 0.78 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 42 Final Effective Tributary Area 33,630 0 0 0 0 0 0 0 0 0 sq-ft 43 Initial Design Capture Volume Retained by Site Design Elements 0 0 0 0 0 0 0 0 0 0 cubic-feet 44 Final Design Capture Volume Tributary to BMP 2,522 0 0 0 0 0 0 0 0 0 cubic-feet Worksheet B.1-1 General Notes: False False False Automated Worksheet B.1-1: Calculation of Design Capture Volume (V1.3) A. Applicants may use this worksheet to calculate design capture volumes for up to 10 drainage areas User input must be provided for yellow shaded cells, values for all other cells will be automatically generated, errors/notifications will be highlighted in red and summarized below. Upon completion of this worksheet, proceed to the appropriate BMP Sizing worksheet(s). Dispersion Area, Tree Well & Rain Barrel Inputs (Optional) Standard Drainage Basin Inputs Results Tree & Barrel Adjustments Initial Runoff Factor Calculation Dispersion Area Adjustments Treatment Train Inputs & Calculations False Kimley-Horn Tesla Temecula - WQMP Peak Flow (Q) Calculation 7/24/2024 1 DCV DCV 2522 cubic-feet 2 DCV retained DCVRetained 0 cubic-feet 3 DCV biofiltered DCVbiofiltered 0 cubic-feet 4 DCV requiring flow-thru (1.5*Line 1)DCVflow-thru 3783 cubic-feet 5 Adjustment factor (Line 4/Line1)AF=1.5 unitless 6 Design rainfall intensity i=0.2 in/hr 7 Area tributary to BMP (s)A=0.99 acres 8 Area-weighted runoff factor C=0.78 unitless 9 Q = AF x (C x i x A) Q= 0.23 cfs Flow-thru Design Flows Values 8/21/2024 14 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 Attachment 1e: Applicable Site Design BMP Fact Sheet(s) from Appendix E BF-3 Proprietary Biofiltration Systems www.sandiegocounty.gov/stormwater E-133 Effective September 15, 2020 E.16 BF-3 Proprietary Biofiltration Systems The purpose of this fact sheet is to help explain the potential role of proprietary BMPs in meeting biofiltration requirements, when full retention of the DCV is not feasible. The fact sheet does not describe design criteria like the other fact sheets in this appendix because this information varies by BMP product model. Criteria for Use of a Proprietary BMP as a Biofiltration BMP A proprietary BMP may be acceptable as a “biofiltration BMP” under the following conditions: (1) The BMP meets the minimum design criteria listed in Appendix F, including the selection criteria (i.e. only allowed in No Infiltration Condition and where site-specific documentation demonstrates that the use of larger footprint biofiltration BMPs (i.e. 3 %) would be infeasible) and the pollutant treatment performance standard in Appendix F.1.1; (2) The BMP is designed and maintained in a manner consistent with its performance certifications (See explanation in Appendix F.1.2); and (3) The BMP is acceptable at the discretion of County staff. While the County has no obligation to accept the use of any proposed proprietary BMP, applicants will be provided a written explanation describing the rationale for the rejection of any proposed devices. Guidance for Sizing a Proprietary BMP as a Biofiltration BMP Proprietary biofiltration BMPs must meet the same sizing guidance as non -proprietary BMPs. Sizing is typically based on capturing and treating 1.50 times the DCV not reliably retained. Guidance for sizing biofiltration BMPs to comply with requirements of this manual is provided in Appendix F.1.2. Maintenance Overview Refer to manufacturer for maintenance information. PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 15 Template Date: August 14th, 2022 Preparation Date: March, 2024 Attachment 1f: Structural BMP Inventory Stormwater Structural Pollutant Control & Hydromodification Control BMPs* (List all from WQMP) Description/Type of Structural BMP Plan Sheet # BMP ID# DMA ID No. Revisions To Be Provided Modular Wetland System 1 43 16 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 Attachment 1g: Structural Pollutant Control BMP Checklist Provide the following items for each Structural BMP selected Refer to Figure 5-2: Stormwater Pollutant Control Structural BMP Selection Flow Chart ☐ Not included because the entire project is designed with Self-Mitigating, De-Minimis, or Self- Retaining DMAs. The project is compliant with Pollution Control BMP sizing requirements. DMA ID No. 4 Structural BMP ID No. 1 Construction Plan Sheet No. 1 Geotechnical/ Soils Engineering Recommendations: Worksheet C.4-1: Categorization of Infiltration Feasibility Condition ☐ Full Infiltration ☐ Partial Infiltration ✓ No Infiltration Worksheet D.5-1: Factor of Safety and Design Infiltration Rate Design Infiltration rate ___TBD____ (in/hr) Structural BMP Selection and Design (Chapter 5.5) complete and include the applicable worksheet(s) found in appendix B (color coded Green below) and design criteria checklists from the associated fact sheets found in appendix E (color coded Orange below) for selected Structural BMP(s): ☐ Worksheet B.6-1 - Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below) ☐ Retention by harvest and use (HU-1) ☐ Continuous simulation Model ☐ Worksheet B.4-1 ☐ Infiltration basin (INF-1) ☐ Bioretention (INF-2) ☐ Permeable pavement (INF-3) ☐ Worksheet B.5-1 ☐ Biofiltration with partial retention (PR-1) ✓ Biofiltration (BF-1) ☐ Biofiltration with Nutrient Sensitive Media Design (BF-2) ☐ Proprietary Biofiltration (BF-3) ☐ Appendix F checklist ☐ Worksheet B.5-3 Minimum Footprint ☐ Worksheet B.5-4 Biofiltration + Storage ☐ Selected BMPs have been designed to address the entire DCV. The DMA is compliant with Pollution Control BMP sizing requirements. STOP * ☐ Other (describe in discussion section below) 0.05 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 17 Template Date: August 14th, 2022 Preparation Date: March, 2024 ☐ Worksheet B.6-1 - Flow-thru treatment control with alternative compliance (provide BMP type/description in discussion section below) ☐ Describe in discussion section below why the remaining BMP size could not fit on site. ☐ Selection of Flow-Thru Treatment Control BMPs with high or medium effectiveness ☐ Vegetated swales (FT-1) ☐ Media Filters (FT-2) ☐ Sand Filters (FT-3) ☐ Dry Extended Detention Basin (FT-4) ☐ Proprietary flow-thru treatment control (FT-5) ☐ Water Quality Equivalency Worksheets20 Purpose: ☐ Pre-treatment/forebay for another structural BMP ✓ Pollutant control only ☐ Combined pollutant control and hydromodification control (see Attachment 2) ☐ Other (describe in discussion section below) Who will certify construction of this BMP? Provide name and contact information for the party responsible to sign BMP verification forms (See Chapter 1.12 of the BMP Design Manual) Who will be the final owner of this BMP? ☐ HOA ✓ Property Owner ☐ City ☐ Other (describe) Who will maintain this BMP into perpetuity? ☐ HOA ✓ Property Owner ☐ City ☐ Other (describe) Discussion (as needed): * If this box is checked, Worksheet B.6 -1 does not need to be filled out. Greenlaw Partners Damian Burke Property Owner Representative M: (949) 554-3721 18 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 CHECKLIST 1 Checklist of Items to Include on Plan Sheets Showing Permanent Stormwater BMPs, Source Control, and Site Design Use this checklist to ensure the required information has been included on the plans: The plans must identify: ☐ Structural BMP(s) with ID numbers ☐ The grading and drainage design shown on the plans must be consistent with the delineation of DMAs shown on the DMA exhibit ☐ Improvements within City Public Right-of-Way have been designed in accordance with Appendix K: Guidance on Green Infrastructure. ☐ Details and specifications for construction of structural BMP(s). ☐ Manufacturer and part number for proprietary parts of structural BMP(s) when applicable . ☐ Signage indicating the location and boundary of source control, site design, and structural BMP(s) as required by City staff. ☐ How to access the structural BMP(s) to inspect and perform maintenance. ☐ Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, benchmarks or other features that allow the inspector to view necessary components of the structural BMP and compare to maintenance thresholds) ☐ Include landscaping plan sheets showing vegetation and amended soil requirements for vegetated structural BMP(s), amended soil areas, dispersion areas, tree-wells, and self- mitigating areas ☐ All BMPs must be fully dimensioned on the plans ☐ Include all Construction stormwater, source control, and site design measures described in the WQMP. Can be included as separate plan sheets as necessary. ☐ When proprietary BMPs are used, site -specific cross section with outflow, inflow, and model number must be provided. Photocopies of general brochures are not acceptable. DA T E DR W N CH K D DE S C R I P T I O N 10 / 0 3 / 2 4 PM E PR RE V I S E I N V E R T S P E R U P D A T E D P L A N AS N O T E D SHEET OF DA T E : PR O J E C T # : DR A W N : CH E C K E D : TH I S D R A W I N G H A S B E E N P R E P A R E D B A S E D O N I N F O R M A T I O N P R O V I D E D T O A D S / S T O R M T E C H U N D E R T H E D I R E C T I O N O F T H E P R O J E C T ’ S E N G I N E E R O F R E C O R D ( “ E O R ” ) O R O T H E R P R O J E C T R E P R E S E N T A T I V E . T H I S D R A W I N G I S N O T I N T E N D E D F O R U S E I N B I D D I N G O R C O N S T R U C T I O N W I T H O U T T H E E O R ’ S PR I O R A P P R O V A L . E O R S H A L L R E V I E W T H I S D R A W I N G P R I O R T O B I D D I N G A N D / O R C O N S T R U C T I O N . I T I S T H E U L T I M A T E R E S P O N S I B I L I T Y O F T H E E O R T O E N S U R E T H A T T H E P R O D U C T ( S ) D E P I C T E D A N D A L L A S S O C I A T E D D E T A I L S M E E T A L L A P P L I C A B L E L A W S , R E G U L A T I O N S , A N D P R O J E C T R E Q U I R E M E N T S . 46 4 0 T R U E M A N B L V D HI L L I A R D , O H 4 3 0 2 6 2 2 09 - 0 4 - 2 4 S4 3 0 8 6 4 LA H CJ D TE S L A T E M E C U L A TE M E C U L A , C A GENERAL PROFILE A-A & UNIT ELEVATIONS NTS / ASSUMES 6" WALL THICKNESS & 8" TOP SLAB SIZE MATERIAL INVERT A INLET 1 2 3 4 OUTLET 12 HDPE 1008.60 6"HDPE 1005.93 32.0" 6" PERFORATED UNDERDRAIN (TYP) 36" SOLID LID (TYP) INLET 1 12 HDPE INLET PIPE INV - 1008.60 A A RIP-RAP AT ALL INLET POINTS PLAN VIEW SCALE: 1/2"=1' NOTE: UNDERDRAIN SHOWN IS SCHEMATIC ONLY. FOR DETAILS ON UNDERDRAIN SIZING AND LAYOUT SEE ECOSTREAM INSTALLATION GUIDE FOR DETAILS, KIT NUMBER AND PLACEMENT OPTIONS THE ECOSTREAM BIOFILTER™ IS A BIOFILTRATION STORMWATER TREATMENT TECHONOLOGY RELIES ON PHYSICAL, CHEMICAL AND BIOLOGICAL MECHANISMS TO REMOVE TOTAL SUSPENDED SOLIDS, TOTAL PHOSPHORUS, TOTAL NITROGEN, HEAVY METALS, OIL and GREASE, TRASH AND BACTERIA. WATER QUALITY FLOW RATE (CFS) ECOSTREAM BIOFILTER WQU1 0.251 ES36E (6' X 6') BEEHIVE GRATE (BYPASS OVERFLOW) FILTER MEDIA GROWTH MEDIA 6" UNDERDRAIN (SEE NOTE) GRAVEL A (29" MIN)32" (5.0' MIN) RIP-RAP AT ALL INLET POINTS SOLID LID (TYP) 1005.93 BYPASS GRATE 1008.60 1012.60 6.0' 14.07' 1020.00 Ec o S t r e a m B i o f i l t e r St o r m w a t e r M e d i a F i l t e r s TM OUTLET 6" HDPE OUTLET PIPE INV - 1005.93 CAP STANDPIPE 6.00' 6. 0 0 ' CAP STANDPIPE adspipe.com 800-821-6710 EcoStreamTM Biofiltration System Operation & Maintenance Guidance Description The EcoStream Biofiltration System (EcoStream) is an engineered stormwater biofiltration treatment system designed to capture and retain a variety of pollutants including sediments, phosphorus, heavy metals, and hydrocarbons from stormwater runoff. EcoStream incorporates the processes of sedimentation, filtration, infiltration, adsorption, and biological uptake to provide both water quality and quantity benefits in a small footprint. EcoStream should be activated after a site is stabilized to prevent uncontrolled stormwater runoff from the construction site from entering the system. Configuration The EcoStream system comes in many standard sizes and is available in several different deployment configurations. Excess flow spills over an overflow pipe and is directly discharged along with treated flow. The EcoStream system can be configured as a planter box filter with an open top that is suitable for shrubs and grasses, or as an underground filter with a subsurface inlet pipe. The optional external high flow bypass may be incorporated with any of these configurations. Operations Stormwater runoff enters the EcoStream via a pipe inlet or curb inlet and flows downward under gravity flow through mulch/media/gravel layers. The top layer provides pretreatment by retaining the coarse sediments, trash, and debris. The fine sediments and dissolved pollutants are further treated through the media bed in depth. Treated water enters an underdrain pipe or infiltrates into the ground (installations with open bottoms). A flow control orifice is placed downstream of the underdrain to ensure the distribution of flow in the media bed. Inspections and Maintenance Overview The EcoStream system requires periodic inspection and maintenance for it to operate at the design efficiency. The inspection process helps in deciding when and what level of maintenance will be needed to bring the unit up to or near peak efficiency. As with ADS’ other water quality products, the maintenance cycle of the EcoStream system will be driven mostly by the actual solids and trash/debris load brought into the system. The frequency of maintenance depends on the site-specific pollutant loading conditions. ADS recommends a visual inspection of the system quarterly for the first year of service, and after every high intensity and high-volume storm event occurring (1 in/hr and greater than 3 inches rainfall within 24 hours) during the first six months. After the first year, systems should be inspected at least bi-annually and ideally before the spring or rainy season and after the summer season, or prior to fall or winter seasons. The inspections should look for signs of but not limited to erosion, displacement, sediment, and trash accumulations in the upper portion of media bed or planting area. It is recommended that some general “good housekeeping” maintenance be performed at the beginning of the rainy or spring season every year. Depending on the site conditions, full system maintenance including removal of all media and plant life may be necessary if ponding water remains on top of media bed for 24 hours after any storm event. For most maintenance needs, the EcoStream planting component follows the practices used for handling standard bioretention systems (i.e., general landscaping, cover management, and replacement planting of surface plants). It may be advisable to “water” or irrigate the EcoStream plant area in geographical regions experiencing droughts or prolong periods without rainfall during the first year of service. Watering the plant life will help to ensure the plants can take hold and be established for future growth and treatment capabilities. Inspection and General Maintenance Equipment The following is a list of equipment recommended for inspection and general maintenance. General Inspection and Maintenance Procedures Routine inspection will ensure that the system is performing at optimal conditions and that the risk of public flooding is low. EcoStream inspection involves a visual inspection of the plant surface area, structure inlet, and the media bed. This can all be done at the surface and requires no confined space entry into the EcoStream unit. An Inspection O&M log should be used, dates and weather conditions should be noted. If the EcoStream is located in a traffic area (i.e. roadway or automobile travel way), and inspection is not possible without entering the vehicular area, safety measures should be employed --safety cones setup, etc. --prior to performing the inspection and maintenance. For inspection of the treatment chamber of the EcoStream system, the manhole cover should be safely removed (i.e., using a manhole hook). A visual inspection of any inlet grates should be noted. If grates are missing or inlets are damaged, contact ADS for recommendation of repair. A visual inspection of the general appearance of the EcoStream should be performed, and notes should be taken detailing the condition of the surface plant life, invasive species intrusion, vandalism, erosion in the planting area and any signs of standing water or disturbed or “shifted” surface soil bed area. This general system condition should be noted in the inspection/maintenance log. If the plant life and surface media show signs of distress, general landscaping O&M should be performed, i.e., raking, weeding (removal of invasive plants), and general planting replacement to maximize the cover area in the planting bed/media treatment chamber. If ponding of water is present in the media treatment cell and the last rain event was greater than 24 hours prior, further inspection should be performed to ensure the effluent pipe is not blocked. A visual inspection (with a flashlight if needed) will inspect the appearance of the inlet (pipe or curb) and media bed. Remove all trash and debris from the inlet and the top of the media bed manually or by vacuum truck as required. If there is a visible sediment load or the media bed appears to have been greatly disturbed during preceding storm events, redistribute or replace the top mulch layer as needed. If sediment load is heavy, remove the mulch layer and inspect the biofiltration media and replace the top two-inch media if it appears clogged. Additionally, a further inspection should be undertaken within 24 hours after a major storm event to see if there is standing water in the system. Water stagnation in the treatment chamber indicates that media bed replacement may be recommended. ADS Field Engineering can assist with this analysis. ADS should be contacted for material specifications and replacement parts. Media chamber replacement will involve utilizing small construction excavation equipment. Disposal of material from the treatment chamber should be in accordance with the local municipality’s requirements. Typically, traditional municipal landfills can be used for disposal of solids and trash obtained from servicing the EcoStream. Call ADS at 800-821-6710 for further information. Records of Operation and Maintenance The owner shall maintain annual records of the operation and maintenance of the EcoStream unit to document the effective maintenance of this important component of a site’s stormwater management program. The attached Inspection & Maintenance Log is suggested and should be retained for a minimum period of two years. • Personal Protection Equipment (pants, steel-toed shoes, safety glasses, gloves, safety vest, hard hat, etc.) • Manhole Hook or Crowbar • Traffic Cones and Signage • Stadia Rod and Tape Measure • Inspection Operation and Maintenance (O&M) Log or other recording method (included at end of guide) • Flashlight, Trash removal “Net” device, shovel, rake, broom and trash receptacle • Vac Truck (if more extensive maintenance is required) • Light Duty Construction Equipment (if bioretention media replacement is required Technical Note TN 1.13 EcoStreamTM Considerations Overview The ADS EcoStream Biofiltration system is a manufactured water quality treatment device intended for removal of Total Suspended Solids (TSS), as well as contaminants like oil, grease, trash, heavy metals, and compounds such as nitrogen & phosphorus. This unit introduces the ability to receive both surface and subsurface runoff, allowing it to be installed in many locations and applications. Once installed, the unit’s ability to treat through filtration, adsorption and biological processes will ensure sufficient water quality treatment of the influent runoff. System Components 1 Concrete Vault Designed for H-20 loading, meeting the specifications outlined in ASTM C857 and ASTM C858. The concrete shall have a minimum unconfined compressive strength of 4000 psi. 2 Inlet Pipe or Throat Inlet Diameter and material per plans 3 Energy Dissipation Stone Rip rap shall be sourced locally 4 Mulch Mulch shall be double shredded, and will be sourced locally 5 Biofiltration Media Engineered media targeting treatment requirements. 6 Underdrain Pipe Comprised of perforated drain tile and PVC pipe fittings that shall meet ASTM D1785 7 Underdrain Stone #57 Stone sourced by contractor 8 Flow Control Orifice 9 High Flow Bypass with Beehive Grate These components shall meet ASTM D1785 and will be provided to the contractor partially pre-cut and/or pre-assembled 10 Outlet Pipe Diameter and material per plans Figure 1: EcoStream System Components Functionality 1) Stormwater runoff enters the unit through a throat inlet or subsurface influent pipe. (Item 1 in Figure 1) Energy dissipation stone is present to reduce the flow velocity. (Item 2 in Figure 1) Figure 2: Treatment flow path shown through a unit with an inlet pipe 2) After entering the unit, runoff will flow downward via gravity through the EcoStream system. The top mulch layer will filter out course sediment and gross pollutants. The biofiltration layer is designed to remove fine sediments and dissolved pollutants, such as heavy metals or nutrients. 3) Treated water enters the perforated underdrain pipe (Item 6 in Figure 1) and then exits the EcoStream through the outlet pipe. (Item 10 in Figure 1) A flow control orifice is included in the underdrain piping to limit the flow rate through the system, to ensure adequate residence time within the system. (Item 8 in Figure 1) Figure 3: Treatment flow pathway shown in profile view 4) During peak storm events where the treatment capacity of the system is exceeded, runoff will pond up and begin to flow through bypass standpipe. (Item 9 in Figure 1.) Figure 3 above shows the treatment flowpath through the unit in green, and also shows the bypass flow path in orange. Bypass Path Design Summary Table Ecostream Unit Model Treatment Cell Dimensions – ft Treatment Rate - cfs ES 4x4 4x4 0.147 ES 4x6 4x6 0.221 ES 4x8 4x8 0.294 ES 4x10 4x10 0.368 ES 4x12 4x12 0.441 ES 6x8 6x8 0.441 ES 6x10 6x10 0.551 ES 6x12 6x12 0.662 ES 8x10 8x10 0.735 ES 8x12 8x12 0.882 ES 8x14 8x14 1.029 ES 8x16 8x16 1.176 Design Considerations – Inverts/Elevations In addition to ensuring that the correctly sized EcoStream unit is selected for the project based upon the above treatment parameters, there are additional factors to consider when designing a site with an EcoStream unit. The required design head of the system is 32”, meaning there needs to be 32” from the invert of the outlet pipe to the top of the bypass pipe. (The media chamber is 32” from the floor to the top of the bypass pipe.) Figure 4. Figure 4: EcoStream inlet/outlet The total depth of the media is 27”; The layer of growth media is 5” thick, the layer of the EcoStream media is 15” thick, and the stone layer is 7” thick. (The stone layer corresponds to the OD of the underdrain pipe.) If an inlet pipe configuration is used, it must be placed such that the inlet pipe invert is above the media layers. Selected Model Installation Installation of the EcoStream unit will involve subsurface excavation, placement of sub-base aggregate material, positioning/casting of the vault, and arrangement of the internal components. Proper installation of the unit is crucial to ensure performance in alignment with the parameters specified above. Please refer to the EcoStream BioFiltration Installation Guide for specifics on how the unit should be installed. Variance from the steps outlined in this document can result in an improperly functioning unit. Plants Plants are not required to be utilized but if desired, choice of plant should align with local requirements and/or be chosen by a qualified landscape architect. If guidance is required, ADS can provide a generic plant list for assistance in design. Please refer to local requirements/approvals to determine if plants are required for the EcoStream BioFilter in your area. The ADS logo, EcoStream and the Green Stripe are registered trademarks of Advanced Drainage Systems, Inc. © 2023 Advanced Drainage Systems, Inc. TN 1.13 July 2023 EcoStreamTM BioFilter The EcoStream BioFilter is a leader in the Biofiltration stormwater treatment market. This high flow, low impact system incorporates the processes of sedimentation, filtration, adsorption, and biological. The ADS EcoStream BioFilter is designed to capture and retain a variety of pollutants including sediment, nutrients, heavy metals, and hydrocarbons while helping to meet green infrastructure objectives. Boasting a small footprint and high flowrate, the EcoStream BioFilter offers high value and outstanding performance. Features • High filter media area and flowrate • Low elevation change between the inlet and outlet of the system • Superior removal mechanisms utilizing physical unit operations and biological processes • Living plant component on the surface of the unit • Internal bypass • Optional external high flow bypass available in most configurations • Available in multiple configurations to meet specific requirements • Scalable systems allow for treatment rates starting at 66 GPM • Surface loaded filter that can receive water via inlet pipe or curb inlet Benefits • Compact footprint without sacrificing flowrate • Can utilize regional plant life in the plant growth section • Simple, efficient, cost-effective design • Maintainable system with access to remove accumulated pollutants before full media replacement is required • Supports designs both with and without a plant growth section EcoStream BioFilter Specification Materials and Design • Concrete Structures: Designed for H-20 traffic loading and applicable soil loads or as otherwise determined by a Licensed Professional Engineer. The materials and structural design of the devices shall be per ASTM C857 and ASTM C858. • Internal components are constructed of proprietary media blends, recycled polyethylene and an underdrain. Performance • The EcoStream BioFilter is an inline unit capable of conveying 100% of the design peak flow and can bypass (internally or externally) excessive flow rates. • Up to 66 GPM in a 4’ x 4’ (1.2 x 1.2 m) unit, with larger units available for higher treatment flowrates • Greater than 85% removal of TSS and 84% removal of phosphorus Installation EcoStream should be activated after a site is stabilized to prevent uncontrolled stormwater runoff from the construction site from entering the system. Installation of the EcoStream BioFilter unit(s) shall be performed per manufacturer’s installation instructions. Such instructions can be obtained by calling Advanced Drainage Systems at (800) 821-6710 or by logging on to www.adspipe.com. EcoStream Model Treatment Rate cfs (L/s)* Mass Capture Capacity lb (kg) 4 x 4 0.147 (4.2)271 (123) 4 x 6 0.221 (6.3)407 (185) 4 x 8 0.294 (8.3)542 (246) 4 x 10 0.368 (10.4)678 (308) 4 x 12 0.441 (12.5)813 (369) 6 x 6 0.331 (9.4)610 (277) 6 x 8 0.441 (12.5)813 (369) 6 x 10 0.551 (15.6)1016 (461) 6 x 12 0.662 (18.7)1220 (553) 8 x 10 0.735 (20.8)1355 (615) 8 x 12 0.882 (25.0)1626 (738) 8 x 14 1.029 (29.1)1897 (860) 8 x 16 1.176 (33.3)2168 (983) *Based on NJCAT/DEP filtration testing protocol adspipe.com 800-821-6710 ADS “Terms and Conditions of Sale” are available on the ADS website, www.ads-pipe.com The ADS logo, EcoStreamTM and the Green Stripe are registered trademarks of Advanced Drainage Systems, Inc. © 2023 Advanced Drainage Systems, Inc. #11162 11/23 CS Selected Model PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 19 Template Date: August 14th, 2022 Preparation Date: March, 2024 CHECKLIST 2 Checklist for Hydrology/Hydraulic Analysis Use this checklist to ensure the required information has been included on the Hydrology/Hydraulic Analysis : ☐ The project is subject to the requirements of City of Temecula Construction, Grading, and Encroachment Ordinance Section 18.06.020 and requires a grading permit and Hydrology Hydraulic Analysis. Prepare Hydrology/Hydraulic Analysis and include all elements of checklist below. ☐ The project is exempt from grading permit requirements of City of Temecula Construction, Grading, and Encroachment Ordinance per Section 18.06.060. Document the project exempt category and justification and STOP. Grading Exemption Category (A-O):_____ Discussion/Justification of Exemption: Hydrology/Hydraulic Analysis. The engineer of record shall prep are and submit studies and data regarding hydrology/hydraulic analysis and calculations for ten (10) and one hundred (100) year storm events per Riverside County Flood Control & Water Conservation District Hydrology Manual. Drainage area maps shall also be submitted to d etermine the quantity of runoff generated by or tributary to the site, and its effects on the site or upon upstream or downstream properties. the study shall include the following but not limited to: ☐ In the narrative of the report please provide a summary table of pre - and post- development C, Tc, I, A, V100, Q100 without mitigation and Q100 with mitigation for each area (or point) where drainage discharges from the project. Peak runoff rates (cfs), velocities (fps) and identification of all erosive velocities (at all points of discharge) calculations for pre - development and post-development. The comparisons should be made about the same discharge points for each drainage basin affecting the site and adjacent properties. ☐ Summary/Conclusion: Please discuss whether the proposed project would substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on - or off-site? Provide reasons and mitigations proposed.☐ Provide existing and proposed Hydrology Maps for each phase. The maps shall show existing and proposed culverts, discharge point with A & Q, flow path direction for each drainage basin. Show existing FEMA floodplain/floodway which flow through the property. A minimum map size is 11"x17". ☐ Provide Hydrologic Soil Group Map. ☐ Provide Rainfall Isopluvials for 100 Year Rainfall Event - 6 Hours and 24 Hours Maps. ☐ The report should have numbered pages and a corresponding Table of Contents. ☐ Improvements within City Public Right-of-Way have been designed in accordance with Appendix K: Guidance on Green Infrastructure. ☐ BMP’s have been designed to safely convey the 100-year flood ☐ Limits of Inundation. Said limits on the property, during specified storm frequencies, shall be delineated on the plans; supporting calculations shall also be required. See attached H&H memo. kimley-horn.com 1100 Town and Country Road, Suite 700, Orange, CA, 92868 714-939-1030 MEMORANDUM To: Engineering Department City of Temecula From: Thomas Kim, PE Kimley-Horn and Associates, Inc. Date: July 24, 2024 Subject: Hydrology Drainage Memo To whom it may concern, Below is the analysis of the hydrologic and hydraulic conditions associated with the development of the project site: The proposed project improvements utilize the existing building and infrastructure for a Tesla repair facility. The site area is 3.35 acres with only 0.96 acres of proposed improvements which will include the construction of asphalt pavement, concrete pavement, landscaping, concrete curb, and storm drain piping. Existing conditions, as shown in Attachment “A”, display drainage sheet flowing to the existing valley gutter that conveys to a nearby vegetated swale along the South. Flow then infiltrates the swale or sheet flows to the nearby creek. Proposed conditions, as shown in Attachment “B”, display the runoff generated will sheet flow towards a proposed storm drain inlet and catch basin. Runoff will then be routed to a biofiltration treatment system. The biofiltration basin is sized to capture and treat runoff for the DCV. In the case of larger storm events, excess runoff will flow into the underdrain and flow through the storm pipe system before being pumped onto the existing curb and gutter on Diaz Rd. In conclusion, the project aims to improve the existing drainage conditions through capture and treatment. The project also aims to maintain the same amount of pervious area as existing conditions due to the nature of the project scope (Tenant Improvement). Therefore, the peak flows are going to be lower than the existing conditions and the overall need for hydrologic analysis would not be required. Please contact me at (714) 786-6297 or thomas.kim@kimley-horn.com should you have any questions. Sincerely, Thomas Kim, PE August 21, 2024 Page 2 kimley-horn.com 1100 Town and Country Road, Suite 700, Orange, CA, 92868 714-939-1030 Attachments A. Pre-Development Exhibit B. Post-Development Exhibit Page 3 kimley-horn.com 1100 Town and Country Road, Suite 700, Orange, CA, 92868 714-939-1030 Attachment A DIAZ RD A1 2.49 A2 0.41 A3 0.45 CITY OF TEMECULA PRE DEVELOPMENT HYDROLOGY EXHIBIT FOR TESLA REPAIR FACILITY TESLA REPAIR FACILITY PRE DEVELOPMENT HYDROLOGY EXHIBIT DIAZ ROAD CITY OF TEMECULA 1© HYDROLOGY SUMMARY LEGEND: HYDROLOGY INFORMATION X XXX NO R T H Page 4 kimley-horn.com 1100 Town and Country Road, Suite 700, Orange, CA, 92868 714-939-1030 Attachment B DIAZ RD A3 0.02 A5 0.02 A2 0.11 A1 0.32 A6 0.06 A4 0.50 CITY OF TEMECULA 1© NO R T H HYDROLOGY SUMMARY LEGEND: HYDROLOGY INFORMATION X XXX TESLA REPAIR FACILITY POST DEVELOPMENT HYDROLOGY EXHIBIT DIAZ ROAD CITY OF TEMECULA POST DEVELOPMENT HYDROLOGY EXHIBIT FOR TESLA REPAIR FACILITY 20 PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS Preparation Date: March, 2024 Template Date: August 14th, 2022 ☐ Flood Protection. The engineer of record responsible for plan preparation shall ensure: a. That the building pads to be created through any proposed grading are free from inundation from runoff from specified storms; and b. That floodplain/floodway elevations and widths, sheet flow depths and any other data required by the City Engineer (or by any applicable County, State or Federal flood protection insurance program/requirements) are delineated on the plans. PRIORITY DEVELOPMENT PROJECT (PDP) REQUIREMENTS 21 Template Date: August 14th, 2022 Preparation Date: March, 2024 CHECKLIST 3 Checklist for Geotechnical and Groundwater Investigation Report The report must address the following key elements, and where appropriate, mitigation recommendations must be provided. ✓ Identify areas of the project site where infiltration is li kely to be feasible and provide justifications for selection of those areas based on soil types , slopes, proximity to existing features, etc. Include completed and signed Worksheet C.4-1. ✓ Investigate, evaluate and estimate the vertical infiltration rates an d capacities in accordance with the guidance provided in Appendix D which describes infiltration testing and ap propriate factor of safety to be applied for infiltration testing results. The site may be broken into sub-basins, each of which has different infiltration rates or capacities. ✓ Describe the infiltration/ percolation test results and correlation with publ ished infiltration/ percolation rates based on soil parameters or classificat ion. Recommend providing design infiltration/percolation rate(s) at the sub -basins. Include completed and signed Worksheet D.5-1. ✓ Investigate the subsurface geological conditions and geotechnic al conditions that would affect infiltration or migration of water toward structures, slopes, utiliti es, or other features. Describe the anticipated flow path of infiltrated water. Indicate if th e water will flow into pavement sections, utility trench bedding, wall drains, founda tion drains, or other permeable improvements. ✓ Investigate depth to groundwater and the nature of the groundwa ter. Include an estimate of the high seasonal groundwater elevations. ✓ Evaluate proposed use of the site (industrial use, residential use, e tc.), soil and groundwater data and provide a concluding opinion whether proposed storm water i nfiltration could cause adverse impacts to groundwater quality and if it does cause impac ts whether the impacts could be reasonably mitigated or not. ✓ Estimate the maximum allowable infiltration rates and volumes that could occur at the site that would avoid damage to existing and proposed structures, utilities , slopes, or other features. In addition the report must indicate if the recommended infiltrati on rate is appropriate based on the conditions exposed during construction. ✓ Provide a concluding opinion regarding whether or not the proposed onsite storm water infiltration/percolation BMP will result in soil piping, daylight water seepage, slope instability, or ground settlement. ✓ Recommend measures to substantially mitigate or avoid any potenti ally detrimental effects of the storm water infiltration BMPs or associated soil response on ex isting or proposed improvements or structures, utilities, slopes or other features within and adj acent to the site. For example, minimize soil compaction. ✓ Provide guidance for the selection and location of infiltrat ion BMPs, including the minimum separations between such infiltration BMPs and structures, stree ts, utilities, manufactured and existing slopes, engineered fills, utilities or other features. Inc lude guidance for measures that adspipe.com 800-821-6710 EcoStreamTM Biofiltration System Operation & Maintenance Guidance Description The EcoStream Biofiltration System (EcoStream) is an engineered stormwater biofiltration treatment system designed to capture and retain a variety of pollutants including sediments, phosphorus, heavy metals, and hydrocarbons from stormwater runoff. EcoStream incorporates the processes of sedimentation, filtration, infiltration, adsorption, and biological uptake to provide both water quality and quantity benefits in a small footprint. EcoStream should be activated after a site is stabilized to prevent uncontrolled stormwater runoff from the construction site from entering the system. Configuration The EcoStream system comes in many standard sizes and is available in several different deployment configurations. Excess flow spills over an overflow pipe and is directly discharged along with treated flow. The EcoStream system can be configured as a planter box filter with an open top that is suitable for shrubs and grasses, or as an underground filter with a subsurface inlet pipe. The optional external high flow bypass may be incorporated with any of these configurations. Operations Stormwater runoff enters the EcoStream via a pipe inlet or curb inlet and flows downward under gravity flow through mulch/media/gravel layers. The top layer provides pretreatment by retaining the coarse sediments, trash, and debris. The fine sediments and dissolved pollutants are further treated through the media bed in depth. Treated water enters an underdrain pipe or infiltrates into the ground (installations with open bottoms). A flow control orifice is placed downstream of the underdrain to ensure the distribution of flow in the media bed. Inspections and Maintenance Overview The EcoStream system requires periodic inspection and maintenance for it to operate at the design efficiency. The inspection process helps in deciding when and what level of maintenance will be needed to bring the unit up to or near peak efficiency. As with ADS’ other water quality products, the maintenance cycle of the EcoStream system will be driven mostly by the actual solids and trash/debris load brought into the system. The frequency of maintenance depends on the site-specific pollutant loading conditions. ADS recommends a visual inspection of the system quarterly for the first year of service, and after every high intensity and high-volume storm event occurring (1 in/hr and greater than 3 inches rainfall within 24 hours) during the first six months. After the first year, systems should be inspected at least bi-annually and ideally before the spring or rainy season and after the summer season, or prior to fall or winter seasons. The inspections should look for signs of but not limited to erosion, displacement, sediment, and trash accumulations in the upper portion of media bed or planting area. It is recommended that some general “good housekeeping” maintenance be performed at the beginning of the rainy or spring season every year. Depending on the site conditions, full system maintenance including removal of all media and plant life may be necessary if ponding water remains on top of media bed for 24 hours after any storm event. For most maintenance needs, the EcoStream planting component follows the practices used for handling standard bioretention systems (i.e., general landscaping, cover management, and replacement planting of surface plants). It may be advisable to “water” or irrigate the EcoStream plant area in geographical regions experiencing droughts or prolong periods without rainfall during the first year of service. Watering the plant life will help to ensure the plants can take hold and be established for future growth and treatment capabilities. Inspection and General Maintenance Equipment The following is a list of equipment recommended for inspection and general maintenance. General Inspection and Maintenance Procedures Routine inspection will ensure that the system is performing at optimal conditions and that the risk of public flooding is low. EcoStream inspection involves a visual inspection of the plant surface area, structure inlet, and the media bed. This can all be done at the surface and requires no confined space entry into the EcoStream unit. An Inspection O&M log should be used, dates and weather conditions should be noted. If the EcoStream is located in a traffic area (i.e. roadway or automobile travel way), and inspection is not possible without entering the vehicular area, safety measures should be employed --safety cones setup, etc. --prior to performing the inspection and maintenance. For inspection of the treatment chamber of the EcoStream system, the manhole cover should be safely removed (i.e., using a manhole hook). A visual inspection of any inlet grates should be noted. If grates are missing or inlets are damaged, contact ADS for recommendation of repair. A visual inspection of the general appearance of the EcoStream should be performed, and notes should be taken detailing the condition of the surface plant life, invasive species intrusion, vandalism, erosion in the planting area and any signs of standing water or disturbed or “shifted” surface soil bed area. This general system condition should be noted in the inspection/maintenance log. If the plant life and surface media show signs of distress, general landscaping O&M should be performed, i.e., raking, weeding (removal of invasive plants), and general planting replacement to maximize the cover area in the planting bed/media treatment chamber. If ponding of water is present in the media treatment cell and the last rain event was greater than 24 hours prior, further inspection should be performed to ensure the effluent pipe is not blocked. A visual inspection (with a flashlight if needed) will inspect the appearance of the inlet (pipe or curb) and media bed. Remove all trash and debris from the inlet and the top of the media bed manually or by vacuum truck as required. If there is a visible sediment load or the media bed appears to have been greatly disturbed during preceding storm events, redistribute or replace the top mulch layer as needed. If sediment load is heavy, remove the mulch layer and inspect the biofiltration media and replace the top two-inch media if it appears clogged. Additionally, a further inspection should be undertaken within 24 hours after a major storm event to see if there is standing water in the system. Water stagnation in the treatment chamber indicates that media bed replacement may be recommended. ADS Field Engineering can assist with this analysis. ADS should be contacted for material specifications and replacement parts. Media chamber replacement will involve utilizing small construction excavation equipment. Disposal of material from the treatment chamber should be in accordance with the local municipality’s requirements. Typically, traditional municipal landfills can be used for disposal of solids and trash obtained from servicing the EcoStream. Call ADS at 800-821-6710 for further information. Records of Operation and Maintenance The owner shall maintain annual records of the operation and maintenance of the EcoStream unit to document the effective maintenance of this important component of a site’s stormwater management program. The attached Inspection & Maintenance Log is suggested and should be retained for a minimum period of two years. • Personal Protection Equipment (pants, steel-toed shoes, safety glasses, gloves, safety vest, hard hat, etc.) • Manhole Hook or Crowbar • Traffic Cones and Signage • Stadia Rod and Tape Measure • Inspection Operation and Maintenance (O&M) Log or other recording method (included at end of guide) • Flashlight, Trash removal “Net” device, shovel, rake, broom and trash receptacle • Vac Truck (if more extensive maintenance is required) • Light Duty Construction Equipment (if bioretention media replacement is required adspipe.com 800-821-6710 ADS “Terms and Conditions of Sale” are available on the ADS website, www.ads-pipe.com The ADS logo, EcoPure BioFilterTM and the Green Stripe are registered trademarks of Advanced Drainage Systems, Inc. © 2023 Advanced Drainage Systems, Inc. MG1.11 2/23 CS EcoStream BioFilter Inspection and O&M Log Sheet Project Name: Location: Date Inspection or O&M Observation/Actions Operator comments and general description Inspector City of Temecula STRUCTURAL BMP VERIFICATION PACKAGE Project Information Project Name Tesla Repair Facility Record ID (e.g., grading/improvement plan number) LD24-2361 Project Address 27635 Diaz Road, Temecula, CA 92590-3425 Assessor's Parcel Number(s) (APN(s)) 921-030-043 Project Watershed (Complete Hydrologic Unit, Area, and Subarea Name with Numeric Identifier) 902.32 Murrieta HSA Responsible Party for Construction Phase Developer's Name Greenlaw Partners, LLC Address 18301 Von Karman Ave, Suite 250, Irvine, CA 92612 Email Address damian@greenlawpartners.com Phone Number (949) 554-3721 Engineer of Work Thomas Kim Engineer's Phone Number (714) 786-6297 Responsible Party for Ongoing Maintenance Owner's Name(s)* Greenlaw Partners, LLC Address 18301 Von Karman Ave, Suite 250, Irvine, CA 92612 Email Address damian@greenlawpartners.com Phone Number (949) 554-3721 *Note: If a corporation or LLC, provide information for principal partner or Agent for Service of Process. If an HOA, provide information for the Board or property manager at time of project closeout. Submit to LDInspections@TemeculaCA.gov 2 STRUCTURAL BMP VERIFICATION INFORMATION Template Date: August 14th, 2022 Preparation Date: ____August 22nd, 2024_____ Stormwater Structural Pollutant Control & Hydromodification Control BMPs* (List all from WQMP) Description/Type of Structural BMP Plan Sheet # BMP ID# Maintenance Agreement Recorded Doc # Revisions Note: If this is a partial verification of Structural BMPs, provide a list and map denoting Structural BMPs that have already been submitted, those for this submission, and those anticipated in future submissions. 3 STRUCTURAL BMP VERIFICATION INFORMATION Template Date: August 14th, 2022 Preparation Date: ____August 22nd, 2024_____ Provide the following items for each Structural BMP selected DMA ID No. Structural BMP ID No. Construction Plan Sheet No. Structural BMP Verification Checklist: complete and include the Construction Verification and Maintenance checklists from the associated fact sheets found in appendix E for selected Structural BMP(s) along with the following items: ☐ Photograph of each completed Structural BMP. ☐ Photograph(s) of each Structural BMP during the construction process to illustrate proper construction as described in the Structural BMP Fact sheets. ☐ Certificates of compliance for materials as required in the Structural BMP Fact sheets. ☐ Infiltration Tests as required in the Structural BMP Fact sheets. ☐ All DMAs draining to the structural BMP have been permanently stabilized and cleaned of all trash and debris. ☐ All drainage systems draining to the structural BMP have been inspected and cleaned and are free of trash and debris. Purpose: ☐ Pre-treatment/forebay for another structural BMP ☐ Pollutant control only ☐ Combined pollutant control and hydromodification control ☐ Other (describe in discussion section below) Who will be the final owner of this BMP? ☐ HOA ☐ Property Owner ☐ City ☐ Other (describe) Who will maintain this BMP into perpetuity? ☐ HOA ☐ Property Owner ☐ City ☐ Other (describe) Discussion (as needed): By signing below, I certify that the Structural BMP(s) for this project have been constructed and all BMPs are in substantial conformance with the approved plans and applicable regulations. I understand the City reserves the right to inspect the above BMPs to verify compliance with the approved plans and City Ordinances. Should it be determined that the BMPs were not constructed to plan or code, corrective actions may be necessary before permits can be closed. Professional Engineer's Printed Name: Professional Engineer's Signed Name: Date: 4 STRUCTURAL BMP VERIFICATION INFORMATION Template Date: August 14th, 2022 Preparation Date: ____August 22nd, 2024_____ City of Temecula Certification City - OFFICIAL USE ONLY: For City Inspector: Verification Package #: __________ City Inspector: Date Project has/expects to close: Date verification received from EOW: By signing below, City Inspector concurs that every noted Structural BMP has been installed per plan. City Inspector’s Signature: _______________________________ Date: For Land Development Staff: Date Received from City Inspector: Land Development Submittal Reviewer: Land Development Reviewer concurs that the information provided for the following Structural BMPs is acceptable to enter into the Structural BMP Maintenance verification inventory: List acceptable Structural BMPs: Land Development Reviewer’s Signature: Date: