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Home My WebLink AboutPRE 2021-0027; IONIS; STORM WATER QUALITY MANAGEMENT PLAN; 2021-06-18City of sbad STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) TEMPLATE E-35 Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov SWQMP OUTLINE [The following outline describes what is expected in the SWQMP. Do not include the following outline as a part of the SWQMP.] Section Content Description Title Page Table of Contents This template contains suggested content for a certification Certification Page page. This may be replaced by jurisdiction specific certification page Project Vicinity Map Placeholder for applicant to insert a vicinity map, required for all projects City Storm Water Standards Questionnaire Form E-34 i.e., is this project a development project subject to storm water requirements? which requirements apply? Base information about the project site that usually remains the Site Information Checklist same even as structural BMP designs evolve. 38 is not the place to put BMP information -BMP information goes in Forms 4, 5 and 6, and Attachments. Project applicant must acknowledge/answer each required City Standard Project Requirement Checklist Form E-36 source control BMP. Project applicant must acknowledge/answer each required site design BMP Project applicant to identify each structural BMP to be Summary of PDP Structural BMPs implemented, identify party responsible for certification following construction , future owner, and party responsible for on-going maintenance into perpetuity. BMP design information will be included in Attachments 1 and 2. There are several required elements in this backup for pollutant Attachment 1: Backup for PDP Pollutant Control BMPs control. The Attachment cover page lists the required elements as a checklist for what the applicant should include in the Attachment. Attachment 1a: OMA Exhibit A checklist of the minimum elements of the OMA Exhibit is provided at the back of the attachment 1 cover sheet. Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations Attachment 1c: Harvest and Use Feasibility Screening Worksheet (Form 1-7 in Appendix I) to be included unless the project will implement infiltration for all DMAs. Attachment 1 d: Categorization of Infiltration Feasibility Worksheet (Form 1-8 in Appendix I) to be included unless the Condition project will implement harvest and use for all DMAs. Project applicant to insert all applicable pollutant control BMP Attachment 1 e: Pollutant Control BMP Design sizing calculations including sizing worksheets, hand Worksheets/Calculations calculations, custom spreadsheets created by the applicant, etc. There are several required elements in this backup. The Attachment 2: Backup for PDP Hydromodification Control Attachment cover page lists the required elements as a Measures checklist for what the applicant should include in the Attachment. E-35 Page 1 of 3 REV 02/16 Section Content Description Attachment 2a: Hydromodification Management Exhibit A checklist of the minimum elements of the Hydromodification Management Exhibit is provided . Applicant must include a copy of the WMAA map with the Attachment 2b: Management of Critical Coarse Sediment project drainage boundaries shown. Other optional analyses for critical coarse sediment yield areas will also be included Yield Areas here when applicable. The cover page provides check boxes for the applicant to indicate what is included. Attachment 2c: Geomorphic Assessment of Receiving Placeholder to include when this applicable. Channels Attachment 2d: Flow Control Facility Design Project applicant to insert all applicable hydromodification manaqement BMP sizinq calculations. Attachment 3: Structural BMP Maintenance Thresholds Checklists for the contents of this attachment are provided - and Actions requirements for this information will vary depending on project status. Attachment 4: City standard Single Sheet BMP (SSBMP) A checklist of required elements to show on the plans is Exhibit provided. This is a comprehensive site plan (24" x 36" size) of the project showing the type and locations of Treatment Control, Hydromodification, Site Design , LID and Source Control BM P's. Use the City's template SSBMP plan , latest version . .. --------------.. ------... ------.. ---.. .. -... - CITY OF CARLSBAD PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR IONIS LOTS 21 AND 22 PROJECT ID: DWG_-_ SWQMP No. ENGINEER OF WORK: JENNA CLARK RCE 91069 PREPARED FOR: lonis Pharmaceuticals, Inc 2855 Gazelle Court Carlsbad, CA 92010 (760) 931-9200 PREPARED BY: Michael Baker International 9755 Clairmont Mesa Blvd San Diego, CA 92124 (858) 614-5000 DATE: 06-18-2021 TABLE OF CONTENTS Certification Page Project Vicinity Map FORM E-34 Storm Water Standard Questionnaire Site Information FORM E-36 Standard Project Requirement Checklist Summary of PDP Structural BMPs Attachment 1: Backup for PDP Pollutant Control BMPs Attachment 1 a: DMA Exhibit Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations Attachment 1 c: Harvest and Use Feasibility Screening (when applicable) Attachment 1d: Categorization of Infiltration Feasibility Condition (when applicable) Attachment 1 e: Pollutant Control BMP Design Worksheets I Calculations Attachment 2: Backup for PDP Hydromodification Control Measures Attachment 2a: Hydromodification Management Exhibit Attachment 2b: Management of Critical Coarse Sediment Yield Areas Attachment 2c: Geomorphic Assessment of Receiving Channels Attachment 2d: Flow Control Facility Design Attachment 3: Structural BMP Maintenance Thresholds and Actions Attachment 4: Single Sheet BMP (SSBMP) Exhibit 11111 .. 11111 .., .. 11111 .. .. - .. - 11111 .. .. .. Ill 1111 .. .. .. .. .. .. .. .. .. .. .. .. - Project Name: lonis Project ID: [Insert] CERTIFICATION PAGE I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order. I have read and understand that the City Engineer has adopted minimum requirements for managing urban runoff, including storm water, from land development activities, as described in the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable source control and site design 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 SWQMP by the City Engineer is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of storm water BMPs for this project, of my responsibilities for project design. Engineer of Work's Signature, PE Number & Expiration Date Jenna Clark Print Name Michael Baker International Company Date Q!) ~ , ..... lOMA,.I TA • Jr;, Oceans,de f1•1 MOvtlfA h .. IA COl1 A /Sr' J cartsbad Project Location VICINITY MAP t«> SCALE Vtsta u I ' • --~ ... • • .r OCUfrC NtU.• ~ • Hllll&Ah('M Lllke$"1 Marco, Sen Marcos ... Elf,nFo,est RN:tHhOnal Reserve ----[Insert City's Storm Water Standard Questionnaire (Form E-34) here] ... -------------------- ----... -- ---- C cityaf Carlsbad I INSTRUCTIONS: STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov To address post-development pollutants that may be generated from development projects, the city requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual, refer to the Engineering Standards (Volume 5). This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to 'PRIORITY DEVELOPMENT PROJECT' (PDP) requirements. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you , this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the city. If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff. A completed and signed questionnaire must be submitted with each development project application. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. PROJECT INFORMATION PROJECT NAME: lonis Lots 21 and 22 PROJECT ID: ADDRESS· Intersection or wn1pta11 Loop ana Gazelle c.;ourt · Carlsbad CA 92010 APN: The project is (check one): jg] New Development D Redevelopment The total proposed disturbed area is: 353,266 ft2 ( 8.1 ) acres The total proposed newly created and/or replaced impervious area is: 265,859 ft2 ( 6.1 ) acres If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the SWQMP # of the larger development project: Project ID SWQMP#: Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. E-34 Page 1 of 4 REV 03/19 STEP1 TO BE COMPLETED FOR ALL PROJECTS To determine if your project is a "development project", please answer the following question: YES NO Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building □ IZl or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)? If you answered "yes" to the above question, provide justification below then go to Step 5, mark the third box stating "my project is not a 'development project' and not subject to the requirements of the BMP manual" and complete applicant information. Justification/discussion: (e.g. the project includes only interior remodels within an existing building): If vou answered "no" to the above question, the project is a 'development project', go to Step 2. STEP2 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer the following questions: Is your project LIMITED to one or more of the following : YES NO 1. Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: a) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non- erodible permeable areas; OR □ [Z] b) Designed and constructed to be hydraulically disconnected from paved streets or roads; OR c) Designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets guidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in □ IZl accordance with the USEPA Green Streets guidance? 3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? □ IZl If you answered "yes" to one or more of the above questions, provide discussion/justification below, then go to Step 5, mark the second box stating "my project is EXEMPT from PDP ... " and complete applicant information. Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance): If you answered "no" to the above questions, your project is not exempt from PDP , go to Step 3. E-34 Page 2 of 4 REV 03/19 STEPS TONqoMPLETED FORALI.Nl!W OR RB>~OPIIENT PR0JIC1"8 To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1 )): YES NO 1. Is your project a new development that creates 10,000 square feet or more of impervious surfaces collectively over the entire project site? This includes commercial, industrial, residential, mixed-use, IZ] □ and public development projects on public or private land. 2. Is your project a redevelopment project creating and/or replacing 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 □ [g] more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. 3. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a restaurant? A restaurant is a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and □ 18] refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812). 4. Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface collectively over the entire project site and supports a hillside development project? A hillside 18] □ development project includes development on any natural slope that is twenty-five percent or greater. 5. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is [g] □ a land area or facility for the temporary parking or storage of motor vehicles used personally for business or for commerce. 6. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious street, road , highway, freeway or driveway surface collectively over the entire project □ ~ site? A street, road, highway, freeway or driveway is any paved impervious surface used for the transportation of automobiles, trucks, motorcvcles, and other vehicles. 7. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more of impervious surface collectively over the entire site, and discharges directly to an Environmentally Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance of □ [g] 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 oroiect to the ESA (i.e. not commingled with flows from adjacent lands).* 8. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface that supports an automotive repair shop? An automotive repair □ IZ] shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC) codes: 5013, 5014, 5541 , 7532-7534, or 7536-7539. 9. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includes □ 18] RGO's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily Traffic (ADTJ of 100 or more vehicles per dav. 10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land □ IRl and are expected to generate pollutants post construction? 11. Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC □ IRl 21 .203.040) If you answered "yes" to one or more of the above questions, your project is a PDP . If your project is a redevelopment project, go to step 4. If your project is a new project, go to step 5, check the first box stating "My project is a PDP ... " and complete applicant information. If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the second box statinq "Mv project is a 'STANDARD PROJECT' ... " and complete applicant information. E-34 Page 3 of 4 REV 03/19 STEP4 TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP) ONLY Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3 .b.(2)): YES NO Does the redevelopment project result in the creation or replacement of impervious surface in an amount of less than 50% of the surface area of the previously existing development? Complete the percent impervious calculation below: Existing impervious area (A) = sq . ft. □ □ Total proposed newly created or replaced impervious area (B) = sq. ft. Percent impervious area created or replaced (B/A)*100 = % If you answered "yes", the structural BMPs required for PDP apply only to the creation or replacement of impervious surface and not the entire development. Go to step 5, check the first box stating "My project is a PDP ... " and complete applicant information. If you answered "no," the structural BMP's required for PDP apply to the entire development. Go to step 5, check the check the first box statinq "My project is a PDP ... " and complete applicant information. STEPS CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION I&] My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I understand I must prepare a Storm Water Quality Management Plan (SWQMP) for submittal at time of application . 0 My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT' stormwater requirements of the BMP Manual. As part of these requirements, I will submit a "Standard Project Requirement Checklist Form E-36" and incorporate low impact development strategies throughout my project. Note: For projects that are close to meeting the PDP threshold , staff may require detailed impervious area calculations and exhibits to verify if 'STANDARD PROJECT' stormwater requirements apply. D My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual. Applicant Information and Signature Box Jenna Clark Civil Engineer Applicant Name: Applicant Title: Applicant Signature: Date: 06-18-2021 .. .. • Environmentally Sens1t1ve Areas include but are not limited to all Clean Water Act Section 303(d) 1mpa1red water bodies; areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City. This Box for Ci Use On/ YES NO City Concurrence: □ □ By: Date: Project ID: E-34 Page 4 of 4 REV 03/19 SITE INFORMATION CHECKLIST Project Summary lnfonnatlon Project Name lonis Lots 21 and 22 Project ID Project Address Intersection of Whiptail Loop and Gazelle Court Assessor's Parcel Number(s) (APN(s)) Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area 8.1 353,266 Acres ( Square Feet) Existing Impervious Area 8.1 Acres ( 353,266 Square Feet) (subset of Parcel Area) Area to be disturbed by the project 8.1 Acres ( 353,266 Square Feet) (Project Area) Project Proposed Impervious Area 6.1 Acres ( 265,859 Square Feet) (subset of Project Area) Project Proposed Pervious Area 2.0 Acres ( 87,407 Square Feet) (subset of Project Area) Note: Proposed Impervious Area+ Proposed Pervious Area= Area to be Disturbed by the Project. This may be less than the Parcel Area. Description of Existing Site Condition and Drainage Patterns Current Status of the Site (select all that apply): D Existing development ~ Previously graded but not built out D Agricultural or other non-impervious use D Vacant, undeveloped/natural Description / Additional Information: Existing condition consists of all natural graded lots with some vegetation. There are two existing basins, one on each lot. Existing Land Cover Includes (select all that apply): ~ Vegetative Cover ~ Non-Vegetated Pervious Areas □ Impervious Areas Description / Additional Information: Existing condition consists of all natural graded lots with some vegetation. There are two existing basins, one on each lot. Underlying Soil belongs to Hydrologic Soil Group (select all that apply): D NRCS Type A D NRCS Type B D NRCS Type C ~NRCS Type D Approximate Depth to Groundwater (GW): D GW Depth < 5 feet □ 5 feet < GW Depth < 10 feet □ 10 feet < GW Depth < 20 feet Ii GW Depth > 20 feet Existing Natural Hydrologic Features (select all that apply): □ Watercourses □ Seeps □ Springs □Wetlands ~None Description/ Additional Information: Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from the site? At a minimum, this description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]: (1) Existing condition consists of both natural and urban drainage conveyance. (2) The eastern lot is graded north to south and drains to an existing basin. The western lot is graded northeast to southwest and drains to an existing basin. The basins infiltrate and higher storm events are discharged by an outlet that connects to the existing storm drain system along Whiptail Loop and is conveyed west. (3) No runoff from offsite is conveyed through the project site. Description of Prooosed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: The project consists of developing two lots with one commercial building , parking structure, and surface level parking areas. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): Buildings, hardscape, parking lots List/describe proposed pervious features of the project (e.g., landscape areas): Landscape areas Does the project include grading and changes to site topography? ~Yes □No Description/ Additional Information: The overall site topography is similar to the existing topography, however some grading was modified on the western and southern ends of the site. Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? ~Yes □No Description / Additional Information: The project proposes to install a new drainage system that will collect and convey storm water to treatment facilities and ultimately to the existing storm drain system along Whiptail Loop. Identify whether any of the following features, activities, and/or pollutant source areas will be present (select all that apply): ~ On-site storm drain inlets ~ Interior floor drains and elevator shaft sump pumps □ Interior parking garages □ Need for future indoor & structural pest control ~ Landscape/Outdoor Pesticide Use □ Pools, spas, ponds, decorative fountains, and other water features ~ Food service □ Refuse areas D Industrial processes D Outdoor storage of equipment or materials □ Vehicle and Equipment Cleaning D Vehicle/Equipment Repair and Maintenance □ Fuel Dispensing Areas □ Loading Docks ~ Fire Sprinkler Test Water D Miscellaneous Drain or Wash Water ~ Plazas, sidewalks, and parking lots Identification of Receiving Water Pollutants of Concern Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable): The project site discharges into the existing storm drain on Whiptail Loop and is conveyed west, ultimately discharging into the branch of Agua Hedionda Creek that drains into the Agua Hedionda Lagoon. The Agua Hedionda Lagoon discharges directly to the Pacific Ocean. List any 303(d) impaired water bodies within the path of storm water 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 for the impaired water bodies: 303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs Agua Hedionda Creek Pathogens Agua Hedionda Creek Toxicity Agua Hedionda Creek Metals/Metalloids Agua Hedionda Creek Nutrients Agua Hedionda Creek Salinity Identification of ProJect Site Pollutants Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see BMP Design Manual Appendix 8 .6): Also a Receiving Not Applicable to Anticipated from the Water Pollutant of Pollutant the Project Site Project Site Concern Sediment ✓ Nutrients ✓ ✓ Heavy Metals ✓ ✓ Organic Compounds ✓ Trash & Debris ✓ Oxygen Demanding ✓ Substances Oil & Grease ✓ Bacteria & Viruses ✓ Pesticides ✓ H dromodlflcatlon Mana ement Re ulrernents Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)? ~ Yes, hydromodification management flow control structural BMPs required . □ No, the project will discharge runoff directly to existing underground storm drains discharging directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. D No, the project will discharge runoff directly to conveyance channels whose bed and bank are concrete-lined all the way from the point of discharge to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. D No, the project will discharge runoff directly to an area identified as appropriate for an exemption by the WMM for the watershed in which the project resides . Description/ Additional Information (to be provided if a 'No' answer has been selected above): Critical Coarse Sediment Yleld Areas* ~his Section on dromodlflcatlon mana ulrements a Based on the maps provided within the WMM, do potential critical coarse sediment yield areas exist within the project drainage boundaries? □Yes ~ No, No critical coarse sediment yield areas to be protected based on WMM maps If yes , have any of the optional analyses presented in Section 6.2 of the BMP Design Manual been performed? D 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite D 6.2.2 Downstream Systems Sensitivity to Coarse Sediment D 6.2 .3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite D No optional analyses performed, the project will avoid critical coarse sediment yield areas identified based on WMM maps If optional analyses were performed , what is the final result? D No critical coarse sediment yield areas to be protected based on verification of GLUs onsite D Critical coarse sediment yield areas exist. but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP. □ Critical coarse sediment yield areas exist and require protection. The project will implement management measures described in Sections 6.2.4 and 6.2 .5 as applicable, and the areas are identified on the SWQMP Exhibit. Discussion/ Additional Information: Per WMM maps the critical coarse sediment areas do not exist on site or in any upstream areas. Flow Control for Post-Project Runoff" ~his Section onl ulred If h dromodlflcatlon mana ement re ulrements a List and describe point(s) of compliance (POCs) for flow control for hydromodification management (see Section 6.3.1 ). For each POC, provide a POC identification name or number correlating to the project's HMP Exhibit and a receiving channel identification name or number correlating to the project's HMP Exhibit. There are 3 POCs for this project. POC-1 is located in the southeast corner of the project where Drainage Areas 1 and 2 discharges connect to the existing storm drain system that flows west. POC-2 is located in the south middle portion of the project where Drainage Area 6 discharges connect to the existing storm drain system that flows west. POC-3 is located in the southwest corner of the project where Drainage Areas 3, 4, and 5 discharges connect to the existing storm drain system that flows west. Has a geomorphic assessment been performed for the receiving channel(s)? ~ No, the low flow threshold is 0.102 (default low flow threshold) □ Yes, the result is the low flow threshold is 0.1 Q2 D Yes, the result is the low flow threshold is 0.302 D Yes, the result is the low flow threshold is 0.5Q2 If a geomorphic assessment has been performed, provide title, date, and preparer: Discussion/ Additional Information: (optional) Other Site Requirements and Constraints When applicable, list other site requirements or constraints that will influence storm water management design, such as zoning requirements including setbacks and open space, or City codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements. Optional Additional lnfonnatlon or Continuation of Previous Sections As Needed This space provided for additional information or continuation of information from previous sections as needed. [Insert City's Standard Project Requirement Checklist Form E-36 (here)] SUMMARYOFPDPSTRUCTURALBMPS C cityof Carlsbad Project Name: lonis Lots 21 and 22 Project ID: DWG No. or Building Permit No.: STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Project lnfonnatlon Source Control BMPa Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See Chapter 4 and Appendix E.1 of the BMP Design Manual (Volume 5 of City Engineering Standards) 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 and/or Appendix E.1 of the Model BMP Design Manual. Discussion/justification is not required. • "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be provided . Please add attachments if more space is needed. • "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 may be provided . Source Control Requirement Applied? SC-1 Prevention of Illicit Discharges into the MS4 ~ Yes 0 No 0 NIA Discussion/justification if SC-1 not implemented: SC-2 Storm Drain Stenciling or Signage Iii Yes 0 No □ N/A Discussion/justification if SC-2 not implemented: SC-3 Protect Outdoor Materials Storage Areas from Rainfall , Run-On, Runoff, and Wind □ Yes □ No ~ N/A Dispersal Discussion/justification if SC-3 not implemented: The project does not propose outdoor material storage areas E-36 Page 1 of 4 Revised 09/16 Source Control Requirement (continued) Annlled? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and □ Yes 0 No [ii N/A Wind Dispersal Discussion/justification if SC-4 not implemented: The project does not propose outdoor work areas SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal [ii Yes 0 No 0 N/A Discussion/justification if SC-5 not implemented: SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for guidance). □ On-site storm drain inlets [ii Yes 0 No 0 N/A □ Interior floor drains and elevator shaft sump pumps [ii Yes □ No 0 N/A □ Interior parking garages □ Yes 0 No [ii N/A □ Need for future indoor & structural pest control [ii Yes 0 No 0 N/A □ Landscape/Outdoor Pesticide Use [ii Yes 0 No 0 N/A □ Pools, spas, ponds, decorative fountains, and other water features □Yes 0 No [ii N/A □Foodservice □Yes □ No [ii N/A □ Refuse areas □ Yes □ No [ii N/A □ Industrial processes □Yes □ No [ii N/A □ Outdoor storage of equipment or materials □ Yes □ No [ii N/A □ Vehicle and Equipment Cleaning □ Yes □ No [ii N/A □ Vehicle/Equipment Repair and Maintenance □ Yes □ No [ii N/A □ Fuel Dispensing Areas □ Yes 0 No [ii N/A □ Loading Docks □ Yes □ No [ii N/A □ Fire Sprinkler Test Water [ii Yes □ No □ N/A □ Miscellaneous Drain or Wash Water [ii Yes □ No □ N/A □ Plazas, sidewalks, and parking lots [ii Yes □ No □ N/A For "Yes" answers, identify the additional BMP per Appendix E.1 . Provide justification for "No" answers. BMPs will be in the form of Bioretention basins (INF-2) and Proprietary Flow-thru Treatment Control (E-210). E-36 Page 2 of 4 Revised 09/16 Site Design BMPs All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual (Volume 5 of City Engineering Standards) 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 BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of the Model BMP Design Manual. Discussion / justification is not required. • "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. • "NIA" means the BMPs is not applicable at the project site because the project does not include the feature that is addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be provided. Site Design Requirement I Applied? SD-1 Maintain Natural Drainaqe Pathways and Hydrologic Features I Iii Yes I 0 No I □ N/A Discussion/justification if SD-1 not implemented: SD-2 Conserve Natural Areas, Soils, and Vegetation I Iii Yes I 0 No I □ N/A Discussion/justification if SD-2 not implemented: SD-3 Minimize Impervious Area I Iii Yes I □ No I □ N/A Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Compaction I Iii Yes I 0 No I □ N/A Discussion/justification if SD-4 not implemented: SD-5 Impervious Area Dispersion I Iii Yes I □ No I □ N/A Discussion/justification if SD-5 not implemented: E-36 Page 3 of 4 Revised 09/16 Site Design Reaulrement (continued) I ADDlled? SD-6 Runoff Collection I □ Yes I ~ No I □ NIA Discussion/justification if SD-6 not implemented: The project is not anticipated to have adequate need for runoff collection to make it practical SD-7 Landscaping with Native or Drought Tolerant Species I ~Yes I 0 No I □ N/A Discussion/justification if SD-7 not implemented: SD-8 HarvestinQ and UsinQ Precipitation I □Yes I ~ No I □ N/A Discussion/justification if SD-8 not implemented: The project is not anticipated to have adequate need for harvest and reuse to make it practical. See Form 1-7. E-36 Page 4 of 4 Revised 09/16 PDP Structural BMPs All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control must be based on the selection process described in Chapter 5. PDPs subject to hydromodification management requirements must also implement structural BMPs for flow control for hydromodification management (see Chapter 6 of the BMP Design Manual). Both storm water pollutant control and flow control for hydromodification management can be achieved within the same structural BMP(s). PDP 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 to certify construction of the structural BMPs (see Section 1.12 of the BMP Design Manual). PDP structural BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the BMP Design Manual). Use this form to provide narrative description of the general strategy for structural BMP implementation at the project site in the box below. Then complete the PDP structural BMP summary information sheet for each structural BMP within the project (copy the BMP summary information page as many times as needed to provide summary information for each individual structural BMP). Describe the general strategy for structural BMP implementation at the site. This information must describe how the steps for selecting and designing storm water pollutant control BMPs presented in Section 5.1 of the BMP Design Manual were followed, and the results (type of BMPs selected). For projects requiring hydromodification flow control BMPs, indicate whether pollutant control and flow control BMPs are integrated together or separate. -This project is not "self-retaining". Runoff factor was adjusted to estimate DCV. -Harvest and re-use is considered infeasible per Form 1-7 -Infiltration is considered infeasible per Form 1-8. -OMA delineations were delineated during the site planning phase utilizing proposed site contours and proposed roof drain inlet locations. Storm water pollutant control BMPs were placed accordingly based on the OMA delineation and the DCV was calculated. -Sizing requirements were computed utilizing Appendix 8 .5 -Based on pollutants generated by the type of project and the 303(d) list at the receiving body water, biofiltration was selected to treat all pollutants prior to entering the public water body. -The calculated footprints fit the site design and constraints, which included limited open space to fit biofiltration basins. -The selected BMPs were sized and designed accordingly using design criteria and considerations from the BMP manual fact sheets in Appendix E. -The project has met the pollutant control performance standards. [Continued from previous page -This page is reserved for continuation of description of general strategy for structural BMP implementation at the site.] Drainage Areas 1 and 4: Storm water is treated with a biofiltration BMP and HMP mitigation is provided with an biofiltration BMP. Drainage Areas 2, 3, 5, and 6: Storm water is treated with a proprietary compact biofiltration BMP and HMP mitigation is provided with an underground vault. Structural BMP Summary Information [Copy this page as needed to provide Information for each Individual proposed structural BMP] Structural BMP ID No. Biofiltration Basin 1 DWG Sheet No. Type of structural BMP: □ Retention by harvest and use (HU-1) □ Retention by infiltration basin (INF-1) □ Retention by bioretention (INF-2) □ Retention by permeable pavement (INF-3) □ Partial retention by biofiltration with partial retention (PR-1) ~ Biofiltration (BF-1) D 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) D Detention pond or vault for hydromodification management □ Other (describe in discussion section below) Purpose: □ Pollutant control only □ Hydromodification control only ~ Combined pollutant control and hydromodification control □ Pre-treatment/forebay for another structural BMP □ Other (describe in discussion section below) Discussion (as needed): Biofiltration Basin 1 detains runoff from Drainage Area 1. The basin features a basin footprint of 2,000 square feet and a 0.75" orifice. Structural BMP Summary lnfonnatlon [Copy this page as needed to provide lnfonnatlon for each lndlvldual proposed structural BMP] Structural BMP ID No. Biofiltration Basin 2 DWG Sheet No. Type of structural BMP: D Retention by harvest and use (HU-1) o Retention by infiltration basin (INF-1) o Retention by bioretention (INF-2) o Retention by permeable pavement (INF-3) o Partial retention by biofiltration with partial retention (PR-1) ~ Biofiltration (BF-1) D 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) o Detention pond or vault for hydromodification management o Other ( describe in discussion section below) Purpose: D Pollutant control only D Hydromodification control only ~ Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BMP D Other ( describe in discussion section below) Discussion (as needed): Biofiltration Basin 2 detains runoff from Drainage Area 4. The basin features a basin footprint of 1,550 square feet and a 1.0" orifice. Structural BMP Summary lnfonnation [Copy this page as needed to provide lnfonnatlon for each Individual proposed structural BMP1 Structural BMP ID No. MWS-1 DWG Sheet No. Type of structural BMP: □ Retention by harvest and use (HU-1) □ Retention by infiltration basin (INF-1) D Retention by bioretention (INF-2) D Retention by permeable pavement (INF-3) □ Partial retention by biofiltration with partial retention (PR-1) □ Biofiltration (BF-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) D Detention pond or vault for hydromodification management □ Other (describe in discussion section below) Purpose: ~ Pollutant control only D Hydromodification control only □ Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BMP D Other (describe in discussion section below) Discussion (as needed): MWS-1 is a MWS-L-8-12 type proprietary biofiltration BMP manufactured by BioClean. The unit features a treatment flowrate of 0.346 CFS, which is in excess of the required treatment flowrate of 0.301 CFS. The unit treats runoff from Drainage Area 2 and is located downstream of Storage Vault 1. Structural BMP Summary lnfonnation [Copy this page as needed to provide lnfonnatlon for each Individual proposed structural BMPl Structural BMP ID No. MWS-2 DWG Sheet No. Type of structural BMP: D Retention by harvest and use (HU-1) □ Retention by infiltration basin (INF-1) □ Retention by bioretention (INF-2) D Retention by permeable pavement (INF-3) □ Partial retention by biofiltration with partial retention (PR-1) □ Biofiltration (BF-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) D Detention pond or vault for hydromodification management □ Other (describe in discussion section below) Purpose: ~ Pollutant control only □ Hydromodification control only □ Combined pollutant control and hydromodification control □ Pre-treatment/forebay for another structural BMP □ Other (describe in discussion section below) Discussion (as needed): MWS-2 is a MWS-L-8-20 type proprietary biofiltration BMP manufactured by BioClean. The unit features a treatment flowrate of 0.577 CFS, which is in excess of the required treatment flowrate of 0.523 CFS. The unit treats runoff from Drainage Area 3 and is located downstream of Storage Vault 2. Structural BMP Summary lnfonnatlon [Copy this page as needed to provide infonnatlon for each individual proposed structural BMP] Structural BMP ID No. MWS-3 DWG Sheet No. Type of structural BMP: D Retention by harvest and use (HU-1) D Retention by infiltration basin (INF-1) D Retention by bioretention (INF-2) D Retention by permeable pavement (INF-3) D Partial retention by biofiltration with partial retention (PR-1) D Biofiltration (BF-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) D Detention pond or vault for hydromodification management D Other ( describe in discussion section below) Purpose: ~ Pollutant control only D Hydromodification control only D Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BMP D Other (describe in discussion section below) Discussion (as needed): MWS-3 is a MWS-L-8-16 type proprietary biofiltration BMP manufactured by BioClean. The unit features a treatment flowrate of 0.462 CFS, which is in excess of the required treatment flowrate of 0.459 CFS. The unit treats runoff from Drainage Area 5 and is located downstream of Storage Vault 3. · Structural BMP Summary Information [Copy this page as needed to provide Information for each lndlvldual proposed structural BMPl Structural BMP ID No. MWS-4 DWG Sheet No. Type of structural BMP: □ Retention by harvest and use (H U-1) □ Retention by infiltration basin (INF-1) D Retention by bioretention (INF-2) □ Retention by permeable pavement (INF-3) □ Partial retention by biofiltration with partial retention (PR-1) □ Biofiltration (BF-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) □ Detention pond or vault for hydromodification management □ Other (describe in discussion section below) Purpose: ~ Pollutant control only □ Hydromodification control only □ Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BMP D Other (describe in discussion section below) Discussion (as needed): MWS-4 is a MWS-L-8-16 type proprietary biofiltration BMP manufactured by BioClean. The unit features a treatment flowrate of 0.462 CFS, which is in excess of the required treatment flowrate of 0.444 CFS. The unit treats runoff from Drainage Area 6 and is located downstream of Storage Vault 4. Structural BMP Summary Information [Copy this page as needed to provide Information for each lndlvldual proposed structural BMPl Structural BMP ID No. Storage Vault 1 DWG Sheet No. Type of structural BMP: o Retention by harvest and use (HU-1) o Retention by infiltration basin (INF-1) D Retention by bioretention (INF-2) o Retention by permeable pavement (INF-3) D Partial retention by biofiltration with partial retention (PR-1) o Biofiltration (BF-1) D 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) rg Detention pond or vault for hydromodification management o Other (describe in discussion section below) Purpose: D Pollutant control only 18 Hydromodification control only D Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BMP D Other (describe in discussion section below) Discussion (as needed): Storage Vault 1 is located upstream of MWS-1 . Storage Vault 1 is a proprietary detention unit (UrbanPond) manufactured by BioClean. The unit features a flood control storage for approximately 4,530 cubic feet and will be controlled by a 12" orifice. Structural BMP Summary lnfonnatlon [Copy this page as needed to provide lnfonnatlon for each Individual proposed structural BMP] Structural BMP ID No. Storage Vault 2 DWG Sheet No. Type of structural BMP: □ Retention by harvest and use (HU-1) □ Retention by infiltration basin (INF-1) □ Retention by bioretention (INF-2) □ Retention by permeable pavement (INF-3) □ Partial retention by biofiltration with partial retention (PR-1) □ Biofiltration (BF-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) rg Detention pond or vault for hydromodification management □ Other ( describe in discussion section below) Purpose: □ Pollutant control only rg Hydromodification control only □ Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BMP □ Other ( describe in discussion section below) Discussion (as needed): Storage Vault 2 is located upstream of MWS-2. Storage Vault 2 is a proprietary detention unit (UrbanPond) manufactured by BioClean. The unit features a flood control storage for approximately 7,850 cubic feet and will be controlled by a 12" orifice. Structural BMP Summary Information [Copy this page as needed to provide Information for each Individual proposed structural BMP] Structural BMP ID No. Storage Vault 3 DWG Sheet No. Type of structural BMP: o Retention by harvest and use (HU-1) D Retention by infiltration basin (INF-1) o Retention by bioretention (INF-2) o Retention by permeable pavement (INF-3) D Partial retention by biofiltration with partial retention (PR-1) o Biofiltration (BF-1) o Flow-thru treatment control included as pre-treatmenUforebay 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) 18 Detention pond or vault for hydromodification management o Other (describe in discussion section below) Purpose: D Pollutant control only ~ Hydromodification control only D Combined pollutant control and hydromodification control D Pre-treatmenUforebay for another structural BMP o Other (describe in discussion section below) Discussion (as needed): Storage Vault 3 is located upstream of MWS-3. Storage Vault 3 is a proprietary detention unit (UrbanPond) manufactured by BioClean. The unit features a flood control storage for approximately 7,300 cubic feet and will be controlled by a 12" orifice. Structural BMP Summary lnfonnatlon [Copy this page as needed to provide lnfonnatlon for each lndlvldual proposed structural BMPl Structural BMP ID No. Storage Vault 4 DWG Sheet No. Type of structural BMP : D Retention by harvest and use (HU-1) D Retention by infiltration basin (INF-1) □ Retention by bioretention (INF-2) □ Retention by permeable pavement (INF-3) □ Partial retention by biofiltration with partial retention (PR-1) □ Biofiltration (BF-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) ~ Detention pond or vault for hydromodification management D Other (describe in discussion section below) Purpose: □ Pollutant control only ~ Hydromodification control only □ Combined pollutant control and hydromodification control □ Pre-treatment/forebay for another structural BMP D Other (describe in discussion section below) Discussion (as needed): Storage Vault 4 is located upstream of MWS-4. Storage Vault 4 is a proprietary detention unit (UrbanPond) manufactured by BioClean. The unit features a flood control storage for approximately 7,340 cubic feet and will be controlled by a 12" orifice. ATTACHMENT 1 BACKUPFORPDPPOLLUTANTCONTROLBMPS This is the cover sheet for Attachment 1. Check which Items are Included behind this cover sheet: Attachment Contents Checklist Sequence Attachment 1 a DMA Exhibit (Required) Attachment 1 b Attachment 1 c Attachment 1 d See DMA Exhibit Checklist on the back of this Attachment cover sheet. (24"x36" Exhibit typically required) Tabular Summary of DMAs Showing DMA ID matching DMA Exhibit, DMA Area, and DMA Type (Required)* *Provide table in this Attachment OR on DMA Exhibit in Attachment 1 a Form 1-7, Harvest and Use Feasibility Screening Checklist (Required unless the entire project will use infiltration BMPs) Refer to Appendix 8 .3-1 of the BMP Design Manual to complete Form 1-7. Form 1-8, Categorization of Infiltration Feasibility Condition (Required unless the project will use harvest and use BMPs) Refer to Appendices C and D of the BMP Design Manual to complete Form 1-8. Kl Included D Included on DMA Exhibit in Attachment 1 a fiQ Included as Attachment 1 b, separate from DMA Exhibit ~ Included D Not included because the entire project will use infiltration BMPs ~ Included D Not included because the entire project will use harvest and use BMPs Attachment 1 e Pollutant Control BMP Design ~ Included Worksheets/ Calculations (Required) Refer to Appendices B and E of the BMP Design Manual for structural pollutant control BMP design guidelines Use this checklist to ensure the required information has been included on the OMA Exhibit: The OMA Exhibit must identify: 18 Underlying hydrologic soil group ~ Approximate depth to groundwater ~ Existing natural hydrologic features (watercourses, seeps, springs, wetlands) ~ Critical coarse sediment yield areas to be protected (if present) ~ Existing topography and impervious areas ~ Existing and proposed site drainage network and connections to drainage offsite gi Proposed grading 18 Proposed impervious features ~ Proposed design features and surface treatments used to minimize imperviousness ~ Drainage management area (OMA) boundaries, OMA ID numbers, and OMA areas (square footage or acreage), and OMA type (i.e., drains to BMP, self-retaining, or self-mitigating) ~ Structural BMPs (identify location and type of BMP) -N 0 N ...___ r----...___ '° <( 2 2 w ---, "' "" 0 <( "' 9 U1 z 0 -I r---00 -N 00 -'fi'." w f-< "" "' 0:: 0 f-(/) / 0 0 < ~ (/) r---00 N 00 -/ <( f- <( 0 o_ / f-0 0 0:: I / "' 0 u o_ 0:: 0 u 0:: w ::§ Cl] "' Ct' "" [I] -<( STORAGE VAUL T 2 760 SF X 10' 7 ,850 CU FT MWS-2 s·x 20 · BIOFILTRATION BASI N 2 1,550 SF STORAGE VAUL T 3 760 SF X 10' 7,300 CU FT Michael Baker INT E RNATIONAL u 0 z 9755 Clairemont Mesa Boulevard <( (fl San Diego, CA 92124 ::;-:: .__ Phone: (858) 614-5000 -MBAKERINTL.COM I I I I \ ~ \ ' , I t.--'' DMA ~S MWS-3 8'X16' \ \ STORAGE VAULT 1 768 SF X 6' 4,530 CU FT ,,1 -. / / ,, i' / , " ,/ ' /, -~ ~ I MWS-1 8 'x1 2 ' EXISTI NG 48" STOR M DRAIN BIOFILTR ATIO N BASI N 1 2 ,000 SF MW S-4 8'X1 6 ' STORAG E VAULT 4 1,024 SF X 7' 7 ,340 CU FT EXISTI NG 48" STOR M DRAIN 50 25 0 50 100 150 l~~~--1~~~~1------<1 SCALE: 1 "~50 ' LEGE ND OV ER ALL 3ASIN LIMIT -- BASI N ID NUMBER OMA-X POINT 0~ COMP LIANC E (POC) G MODULAR WETLAND SYS TEM 1100 11 STORAGE VAULT PER\LI DUS VERSUS I MPERV I DUS BOUNDi'1RY ------- NOTES NO NATURAL HYDROL OGIC FEA TURES CURRENTLY EXIST ON SITE AL L SO i LS URBAN Li'1NDS SO IL TYPE "D" GROUNDWATER DEP TH EXCEEDS 20 FEET NO CRITICAL COARSE SEDIMENT YI ELD AREAS EXIST ON SITE. REFE R TO A.TT ACHMENT 2b REFER TO ATTACHM ENT 1B FOR OMA SUMMARY SOURCE CONTROL BMPS 1 _ PREVENTION OF ILLICI T DISC HARG ES I NTO MS4 (4 2. 1) 2. STORM DRAIN STENCILING OR SIGNAGE (4 .2 2) 3. PROTECT TRASH STORAGE AREAS (4 .2 5) SITE DESIGN BMPS 1 _ CONSERVE NATURAL AREAS (4 3.2) 2. MINIMIZ E IMPERVIOUS AREAS (4 3 3) 3. MIN IMIZE SOIL COMPACTION (4 .3.4 ) 4. IM PE RVIOUS AREA DISPERS ION (4 3.5) 5. LANDSCAPING WITH NA TIVE OR DRO UGH T TOLERA NT SPECIES (4 3 .7 ) IONIS LOTS 21 AND 22 OMA EXHIBIT Project Name: lonis 1 Impervious Area DCV DMAUnique I Area Area %Imp HSG Weighted (cubic Treated By (BMP I Pollutant Control I Drains to Identifier (acres) (acres) Runoff feet) ID) Type (POC ID) Coefficient 1 0.86 0.61 71 D 0.85 1,326 Biofiltration Basin 1 I Biofiltration I 1 2 1.18 0.83 70 D 0.85 1,820 I MWS-2 I Biofiltration I 1 3 2.05 1.44 70 D 0.85 3,164 I MWS-2 I Biofiltration I 2 4 0.62 0.50 81 D 0.90 1,020 Biofiltration Basin 2 Biofiltration I 2 5 1.70 1.36 80 D 0.90 2,770 MWS-3 Biofiltration I 2 6 1.70 1.37 81 D 0.90 2,777 MWS-4 Biofiltration I 3 Total OMA Total Area Total DCV 1 No. of DMAs I Area Impervious %Imp Weighted (cubic Total Area I I No. of Area Runoff Treated (acres) POCs (acres) (acres) Coefficient feet) 6 I 8.1 16.11 76 I I 0.875 I 12,877 I 8.1 I 13 ~: DMA = Drainage Management Area; Imp = Imperviousness; HSG = Hydrologic Soil Group; DCV= Design Capture Volume; BMP = Best Management Practice; POC = Point of Compliance; ID = identifier; No. = Number The City of San Diego I Storm Water Standards Worksheet B-1 I January 2018 Edition SD]J 1. Is there a demand for harvested water (check all that apply) at the project site that is reliably present during the wet season? 0Toilet and urinal flushing [Z]Landscape irrigation □other: ___ _ 2. If there is a demand; estimate the anticipated average wet season demand over a period of 36 hours. Guidance for planning level demand calculations for toilet/urinal flushing and landscape irrigation is provided in Section B.3.2. [Provide a summary of calculations here] 390 gal/acre x 8.1 acres = 3,159 gal = 422 cubic feet 3. Calculate the DCV using worksheet B-2.1. DCV = 12,877 (cubic feet) [Provide a summary of calculations here] See calculation in Attachment 1e Pollutant Control BMP Design Worksheets 3a. Is the 36-hour demand greater than or equal to the DCV? D'•!J, t[Z]No ~ Harvest and use appears to be feasible. Conduct more detailed evaluation and sizing calculations to confirm that DCV can be used at an adequate rate to meet drawdown criteria. 3b. Is the 36-hour demand greater than o.25DCV but less than the full DCV? Oves 1[{] No c:> ,(J. Harvest and use may be feasible. Conduct more detailed evaluation and sizing calculations to determine feasibility. Harvest and use may only be able to be used for a portion of the site, or (optionally) the storage may need to be upsized to meet long term capture targets while draining in longer than 36 hours. Is harvest and use feasible based on further evaluation? D Yes, refer to Appendix E to select and size harvest and use BMPs. D No, select alternate BMPs. The City of San Diego I Storm Water Standards Worksheet B.3-1 : Form 1-7 I January 2018 Edition 3c. Is the 36- hour demand less than o.25DCV? [Z] YE Harvest and use is considered to be infeasible. SD!) ~ • r •, -••• 1 "T I---:. •, ,--' , • ◄ I , ,• > J ,-'categorization of.Infiltration Feasibility Condition based -... t: ,, . · ·. _ .~ c;,n Geot~chnical Co!}ditions1 · Workshe~t C.4-1: For~ I:SA~ -'/ ~· .1·' -'\ ,•, Part 1 -Full Infiltration Feasibility Screening Criteria DMA(s) Being Analyzed: Project Phase: Ionis Design Criteria 1: Infiltration Rate Screening 1A 1B lC 1D Is the mapped hydrologic soil group according to the NRCS Web Soil Survey or UC Davis Soil Web Mapper Type A or B and corroborated by available site soil data3? OYes; the DMA may feasibly support full infiltration. Answer "Yes,, to Criteria 1 Result or continue to Step 1B if the applicant elects to perform infiltration testing. 0 No; the mapped soil types are A or B but is not corroborated by available site soil data (continue to Step 1B). 0 No; the mapped soil types are C, D, or "urban/unclassified'' and is corroborated by available site soil data_ Answer "No,, to Criteria 1 Result. 0 No; the mapped soil types are C, D, or "urban/unclassified,, but is not corroborated by available site soil data (continue to Step 1B)_ Is the reliable infiltration rate calculated using planning phase methods from Table D.3-1? 0Yes; Continue to Step 1C. (:) No; Skip to Step lD. Is the reliable infiltration rate calculated using planning phase methods from Table D.3-1 greater than 0.5 inches per hour? O Yes; the DMA may feasibly support full infiltration. Answer "Yes,, to Criteria 1 Result. (:) No; full infiltration is not required. Answer "No,, to Criteria 1 Result. Infiltration Testing Method. Is the selected infiltration testing method suitable during the design phase (see Appendix D.3)? Note: Alternative testing standards may be allowed with appropriate rationales and documentation. 0 Yes; continue to Step 1E. O No; select an appropriate infiltration testing method. 1 Note that it is not required to investigate each and every criterion in the worksheet, a single "no,, answer in Part 1, Part 2, Part 3, or Part 4 determines a full, partial, or no infiltration condition. 2 This form must be completed each time there is a change to the site layout that would affect the infiltration feasibility condition. Previously completed forms shall be retained to document the evolution of the site storm water design. 3 Available data includes site-specific sampling or observation of soil types or texture classes, such as obtained from borings or test pits necessary to support other design elements. The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form l-8A I January 2018 Edition SDJi lE IF lG Criteria 1 Result Number of Percolation/Infiltration Tests. Does the infiltration testing method performed satisfy the minimum number of tests specified in Table D.3-2? 0 Yes; continue to Step 1F. 0 No; conduct appropriate number of tests. Factor of Safety. Is the suitable Factor of Safety selected for full infiltration design? See guidance in D.5; Tables D.5-1 and D.5-2; and Worksheet D.5-1 (Form I-9). 0 Yes; continue to Step 1G. O No; select appropriate factor of safety. Full Infiltration Feasibility. Is the average measured infiltration rate divided by the Factor of Safety greater than 0.5 inches per hour? O Yes; answer "Yes" to Criteria 1 Result. O No; answer "No" to Criteria 1 Result. Is the estimated reliable infiltration rate greater than 0.5 inches per hour within the DMA where runoff can reasonably be routed to a BMP? O Yes; the DMA may feasibly support full infiltration. Continue to Criteria 2. 0 No; full infiltration is not required. Skip to Part 1 Result. Summarize infiltration testing methods, testing locations, replicates, and results and summarize estimates of reliable infiltration rates according to procedures outlined in D.5. Documentation should be included in project geotechnical report. 2 The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form l-8A I January 2018 Edition SDJ ' Categorization of Infiltration Feasibility Condition based W k h t C . F I SA2 G h · I c d" • or s ee .4-1. orm -on eotec mca on 1t1ons Criteria 2: Geologic/Geotechnical Screening 2A 2A-1 2A-2 2A-3 2B 2B-1 2B-2 3 If all questions in Step 2A are answered "Yes,,, continue to Step 2B. For any "No,, answer in Step 2A answer "No,, to Criteria 2, and submit an "Infiltration Feasibility Condition Letter,, that meets the requirements in Appendix C.1.1. The geologic/geotechnical analyses listed in Appendix C.2.1 do not apply to the DMA because one of the following setbacks cannot be avoided and therefore result in the DMA being in a no infiltration condition. The setbacks must be the closest horizontal radial distance from the surface edge (at the overflow elevation) of the BMP. Can the proposed full infiltration BMP(s) avoid areas with existing fill materials greater than 5 feet thick below the infiltrating surface? Can the proposed full infiltration BMP(s) avoid placement within 10 feet of existing underground utilities, structures, or retaining walls? Can the proposed full infiltration BMP(s) avoid placement within 50 feet of a natural slope (>25%) or within a distance of 1.5H from fill slopes where His the height of the fill slope? QYes QYes OYes When full infiltration is determined to be feasible, a geotechnical investigation report must be prepared that considers the relevant factors identified in Appendix C.2.1. If all questions in Step 2B are answered "Yes,,, then answer "Yes,, to Criteria 2 Result. If there are "No,, answers continue to Step 2c. Hydroconsolidation. Analyze hydroconsolidation potential per approved ASTM standard due to a proposed full infiltration BMP. Can full infiltration BMPs be proposed within the DMA without increasing hydroconsolidation risks? Expansive Soils. Identify expansive soils (soils with an expansion index greater than 20) and the extent of such soils due to proposed full infiltration BMPs. Can full infiltration BMPs be proposed within the DMA without increasing expansive soil risks? OYes OYes QNo ONo ONo ONo QNo The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form l-8A I January 2018 Edition SD]) 2B-3 2B-4 2B-5 2B-6 4 Liquefaction. If applicable, identify mapped liquefaction areas. Evaluate liquefaction hazards in accordance with Section 6.4.2 of the City of San Diego's Guidelines for Geotechnical Reports (2011 or most recent edition). Liquefaction hazard assessment shall take into account any increase in groundwater elevation or groundwater mounding that could occur as a result of proposed infiltration or percolation facilities. Can full infiltration BMPs be proposed within the DMA without increasing liquefaction risks? Slope Stability. If applicable, perform a slope stability analysis in accordance with the ASCE and Southern California Earthquake Center (2002) Recommended Procedures for Implementation of DMG Special Publication 117, Guidelines for Analyzing and Mitigating Landslide Hazards in California to determine minimum slope setbacks for full infiltration BMPs. See the City of San Diego's Guidelines for Geotechnical Reports (2011) to determine which type of slope stability analysis is required. Can full infiltration BMPs be proposed within the DMA without increasing slope stability risks? Other Geotechnical Hazards. Identify site-specific geotechnical hazards not already mentioned (refer to Appendix C.2.1). Can full infiltration BMPs be proposed within the DMA without increasing risk of geologic or geotechnical hazards not already mentioned? Setbacks. Establish setbacks from underground utilities, structures, and/or retaining walls. Reference applicable ASTM or other recognized standard in the geotechnical report. Can full infiltration BMPs be proposed within the DMA using established setbacks from underground utilities, structures, and/or retaining walls? The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form l-8A I January 2018 Edition OYes QNo OYes QNo QYes QNo QYes QNo SDJJ ,, · Categorization of Infiltration Feasibility Condition based W ksh C . F I SA2 G h · I c d" • or eet .4-1. orm -on eotec mca on 1t1ons ,.... :" ·~,·. 2C Criteria 2 Result Mitigation Measures. Propose mitigation measures for each geologic/geotechnical hazard identified in Step 2B. Provide a discussion of geologic/geotechnical hazards that would prevent full infiltration BMPs that cannot be reasonably mitigated in the geotechnical report. See Appendix C.2.1.8 for a list of typically reasonable and typically unreasonable mitigation measures. Can mitigation measures be proposed to allow for full infiltration BMPs? If the question in Step 2 is answered "Yes," then answer "Yes" to Criteria 2 Result. If the question in Step 2C is answered "No," then answer "No" to Criteria 2 Result. Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of geologic or geotechnical hazards that cannot be reasonably mitigated to an acceptable level? Summarize findings and basis; provide references to related reports or exhibits. Part 1 Result -Full Infiltration Geotechnical Screening 4 If answers to both Criteria 1 and Criteria 2 are "Yes't, a full 0Yes 0Yes Result infiltration design is potentially feasible based on Geotechnical O Full infiltration Condition conditions only. If either answer to Criteria 1 or Criteria 2 is "No", a full infiltration design is not required. 0 Complete Part 2 0No 0No 4 To be completed using gathered site information and best professional judgement considering the definition of MEP in the MS4 Permit. Additional testing and/or studies may be required by City Engineer to substantiate findings. 5 The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form l-8A I January 2018 Edition SDJJ Part 2 -Partial vs. No Infiltration Feasibility Screening Criteria DMA(s) Being Analyzed: Project Phase: Ionis Design Criteria 3: Infiltration Rate Screening 3A 3B Criteria 3 Result NRCS Type C, D, or "urban/unclassified": Is the mapped hydrologic soil group according to the NRCS Web Soil Survey or UC Davis Soil Web Mapper is Type C, D, or "urban/unclassified" and corroborated by available site soil data? OYes; the site is mapped as C soils and a reliable infiltration rate of 0.15 in/hr. is used to size partial infiltration BMPS. Answer "Yes" to Criteria 3 Result. OYes; the site is mapped as D soils or "urban/unclassified" and a reliable infiltration rate of 0.05 in/hr. is used to size partial infiltration BMPS. Answer "Yes" to Criteria 3 Result. 0 No; infiltration testing is conducted (refer to Table D.3-1), continue to Step 3B. Infiltration Testing Result: Is the reliable infiltration rate (i.e. average measured infiltration rate/2) greater than 0.05 in/hr. and less than or equal to 0.5 in/hr? O Yes; the site may support partial infiltration. Answer "Yes" to Criteria 3 Result. 0 No; the reliable infiltration rate (i.e. average measured rate/2) is less than 0.05 in/hr., partial infiltration is not required. Answer "No" to Criteria 3 Result. Is the estimated reliable infiltration rate (i.e., average measured infiltration rate/2) greater than or equal to 0.05 inches/hour and less than or equal to 0.5 inches/hour at any location within each DMA where runoff can reasonably be routed to a BMP? OYes; Continue to Criteria 4. 0 No: Skip to Part 2 Result. Summarize infiltration testing and/or mapping results (i.e. soil maps and series description used for infiltration rate). 6 The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form l-8A I Ja nuary 2018 Edition SDJJ ~ ,-,,~._ ~ ~L • _ -• • • , ' ,.,-,,,. .. ,~ p I ,•,1 ··'..Categorization of Infilti:ation Feasil>ility <:;ondition based W ksh., C . F I SA2 . · · G h · 1 c d. •·· · or eet .4-1. orm --. on eotec mca on 1t1ons -·,. ; •I_ ,J-~ •.,. '~.. ' . .,•;~• •I Criteria 4: Geologic/Geotechnical Screening 4A 4A-1 4A-2 4A-3 4B 4B-1 4B-2 4B -3 7 If all questions in Step 4A are answered "Yes," continue to Step 2B. For any "No" answer in Step 4A answer "No" to Criteria 4 Result, and submit an "Infiltration Feasibility Condition Letter" that meets the requirements in Appendix C.1.1. The geologic/geotechnical analyses listed in Appendix C.2.1 do not apply to the DMA because one of the following setbacks cannot be avoided and therefore result in the DMA being in a no infiltration condition. The setbacks must be the closest horizontal radial distance from the surface edge (at the overflow elevation) of the BMP. Can the proposed partial infiltration BMP(s) avoid areas with existing fill materials greater than 5 feet thick? Can the proposed partial infiltration BMP(s) avoid placement within 10 feet of existing underground utilities, structures, or retaining walls? Can the proposed partial infiltration BMP(s) avoid placement within 50 feet of a natural slope (>25%) or within a distance of 1.5H from fill slopes where His the height of the fill slope? 0Yes OYes OYes When full infiltration is determined to be feasible, a geotechnical investigation report must be prepared that considers the relevant factors identified in Appendix C.2.1. If all questions in Step 4B are answered "Yes," then answer "Yes" to Criteria 4 Result. If there are any "No" answers continue to Step 4c. Hydroconsolidation. Analyze hydroconsolidation potential per approved ASTM standard due to a proposed full infiltration BMP. Can partial infiltration BMPs be proposed within the DMA without increasing hydroconsolidation risks? Expansive Soils. Identify expansive soils (soils with an expansion index greater than 20) and the extent of such soils due to proposed full infiltration BMPs. Can partial infiltration BMPs be proposed within the DMA without increasing expansive soil risks? Liquefaction. If applicable, identify mapped liquefaction areas. Evaluate liquefaction hazards in accordance with Section 6.4.2 of the City of San Diego's Guidelines for Geotechnical Reports (2011). Liquefaction hazard assessment shall take into account any increase in groundwater elevation or groundwater mounding that could occur as a result of proposed infiltration or percolation facilities. Can partial infiltration BMPs be proposed within the DMA without increasing liquefaction risks? O Yes O Yes OYes QNo ONo ONo ONo ONo ONo The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form l-8A I January 2018 Edition SDJJ 1~' ccii~g~\_:i~~ti~'n ~i Infilt~atio;.; Fea~ibility C~ndition ·based w k h -t C. 4 . F -I-,-·s;'A·: , -h . 1 d" . or s ee . -1. orm -1: ~ , on Geotec ,mca Con 1t1ons : 4B-4 4B-5 4B-6 4c Criteria 4 Result 8 Slope Stability. If applicable, perform a slope stability analysis in accordance with the ASCE and Southern California Earthquake Center (2002) Recommended Procedures for Implementation of DMG Special Publication 117, Guidelines for Analyzing and Mitigating Landslide Hazards in California to determine minimum slope setbacks for full infiltration BMPs. See the City of San Diego's Guidelines for Geotechnical Reports (2011) to determine which type of slope stability analysis is required. Can partial infiltration BMPs be proposed within the DMA without increasing slope stability risks? Other Geotechnical Hazards. Identify site-specific geotechnical hazards not already mentioned (refer to Appendix C.2.1). Can partial infiltration BMPs be proposed within the DMA without increasing risk of geologic or geotechnical hazards not already mentioned? Setbacks. Establish setbacks from underground utilities, structures, and/or retaining walls. Reference applicable ASTM or other recognized standard in the geotechnical report. Can partial infiltration BMPs be proposed within the DMA using recommended setbacks from underground utilities, structures, and/or retaining walls? Mitigation Measures. Propose mitigation measures for each geologic/geotechnical hazard identified in Step 4B. Provide a discussion on geologic/geotechnical hazards that would prevent partial infiltration BMPs that cannot be reasonably mitigated in the geotechnical report. See Appendix C.2.1.8 for a list of typically reasonable and typically unreasonable mitigation measures. Can mitigation measures be proposed to allow for partial infiltration BMPs? If the question in Step 4C is answered "Yes," then answer "Yes'' to Criteria 4 Result. If the question in Step 4C is answered "No," then answer "No" to Criteria 4 Result. Can infiltration of greater than or equal to 0.05 inches/hour and less than or equal to 0.5 inches/hour be allowed without increasing the risk of geologic or geotechnical hazards that cannot be reasonably mitigated to an acceptable level? The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form I-SA I January 2018 Edition OYes QNo OYes ONo O Yes ONo Q Yes QNo OYes QNo Summarize findings and basis; provide references to related reports or exhibits. Part 2 -Partial Infiltration Geotechnical Screening Result5 If answers to both Criteria 3 and Criteria 4 are "Yes11 , a partial infiltration design is potentially feasible based on geotechnical conditions only. If answers to either Criteria 3 or Criteria 4 is "No11 , then infiltration of any volume is considered to be infeasible within the site. Result 0 Partial Infiltration Condition 0 No Infiltration Condition 5 To be completed using gathered site information and best professional judgement considering the definition of MEP in the MS4 Permit. Additional testing and/or studies may be required by City Engineer to substantiate findings. 9 The City of San Diego I Storm Water Standards Worksheet C.4-1 : Form l-8A I January 2018 Edition SD]J ·categorization oflnfiltration Feasibility Condition based o;,. w ksh t C .4. F I 8B2 .. 11. • • · • • • or ee . -2: orm -. . Groundwater and Water Balance Cond1t1ons · .) ~• • i l Part 1 -Full Infiltration Feasibility Screening Criteria DMA(s) Being Analyzed: Project Phase: lonis Design Criteria 1: Groundwater Screening 1A 1B Groundwater Depth. Is the depth to seasonally high groundwater tables (normal high depth during the wet season) beneath the base of any full infiltration BMP greater than 10 feet? 0Yes; continue to Step 1B. O No; The depth to groundwater is less than or equal to 10 feet, but site layout changes or reasonable mitigation measures can be proposed to support full infiltration BMPs. Continue to step 1B. O No; The depth to groundwater is less than or equal to 10 feet and site layout changes or . reasonable mitigation measures cannot be proposed to support full infiltration BMPs. Answer "No" for Criteria 1 Result. Contaminated Soil/Groundwater. Are proposed full infiltration BMPs at least 250 feet away from contaminated soil or groundwater sites? This can be confirmed using GeoTracker (geotracker.waterboards.ca.gov) to identify open contaminated sites. The setbacks must be the closest horizontal radial distance from the surface edge (at the overflow elevation) of the BMP. 0 Yes; continue to Step 1C. 0 No; However, site layout changes or reasonable mitigation measures can be proposed to support full infiltration BMPs. Continue to Step 1C. O No; Site layout changes or reasonable mitigation measures cannot be proposed to support full infiltration BMPs. Answer "No" to Criteria 1 Result. 1 Note that it is not required to investigate each and every criterion in the worksheet, a single "no" answer in Part 1, Part 2, part 3, or Part 4 determines a full, partial, or no infiltration condition. 2 This form must be completed each time there is a change to the site layout that would affect the infiltration feasibility condition. Previously completed forms shall be retained to document the evolution of the site storm water design. The City of San Diego I Storm Water Standards Worksheet C.4-2 : Form 1-88 I January 2018 Edition SDJJ lC 1D Criteria 1 Result 2 Inadequate Soil Treatment Capacity. Are full infiltration BMPs proposed in DMA soils that have adequate soil treatment capacity? The DMA has adequate soil treatment capacity if ALL of the following criteria (detailed in C.2.2.1) for all soil layers beneath the infiltrating surface are met: • USDA texture class is sandy loam or loam or silt loam or silt or sandy clay loam or clay loam or silty clay loam or sandy clay or silty clay or clay; and • Cation Exchange Capacity (CEC) greater than 5 milliequivalents/10og; and • Soil organic matter is greater than 1%; and • Groundwater table is equal to or greater than 10 feet beneath the base of the full infiltration BMP. 0 Yes; continue to Step 1D. 0 No; However, site layout changes or reasonable mitigation measures can be proposed to support full infiltration BMPs. Continue to Step 1D. 0 No; Site layout changes or reasonable mitigation measures cannot be proposed to support full infiltration BMPs. Answer "No" to Criteria 1 Result. Other Groundwater Contamination Hazards. Are there site-specific groundwater contamination hazards not already mentioned (refer to Appendix C.2.2) that can be reasonably mitigated to support full infiltration BMPs? 0Yes; there are other contamination hazards identified that can be mitigated. Answer "Yes" to Criteria 1 Result. 0 No; there are other contamination hazards identified that cannot be mitigated. Answer "No" to Criteria 1 Result. 0 N/A; no contamination hazards are identified. Answer "Yes" to Criteria 1 Result. Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of groundwater contamination that cannot be reasonably mitigated to an acceptable level? See Appendix C.2.2.8 for a list of typically reasonable and typically unreasonable mitigation measures. 0Yes; Continue to Part 1, Criteria 2. 0 No; Continue to Part 1 Result. The City of San Diego I Storm Water Standards Worksheet C.4-2 : Form 1-88 I January 2018 Edition SDJJ -- Categorization of Infiltration Feasibility Condition based on W k h t C 4 _ . F 1_882 d d I d. . or s ee . 2. orm Groun water an Water Ba ance Con 1t1ons r. Summarize groundwater quality and any mitigation measures proposed. Documentation should focus on groundwater table, mapped soil types and contaminated site locations. 3 The City of San Diego I Storm Water Standards Worksheet C.4-2 : Form 1-88 I January 2018 Edition SDJJ . -.. -. Categorization of Infiltration Feasibility Condition based on W k h t C . F 1 882 , G d d w I C d. . or s ee .4-2. orm -roun water an ater Ba ance on 1t1ons Criteria 2: Water Balance Screening 2A 2B 2C Criteria 2 Result 4 Ephemeral Stream Setback. Does the proposed full infiltration BMP meet both the following? • The full infiltration BMP is located at least 250 feet away from an ephemeral stream; ANll • The bottom surface of the full infiltration BMP is at a depth 20 feet or greater from seasonally high groundwater tables. OYes; Answer "Yes" to Criteria 2 Result. 0 No; Continue to Step 2B. Mitigation Measures. Can site layout changes be proposed to support full infiltration BMPs? 0Yes; the site can be reconfigured to mitigate potential water balance issues. Answer "Yes" to Criteria 2 Result. O No; the site cannot be reconfigured to mitigate potential water balance issues. Continue to Step 2C and provide discussion. Additional studies. Do additional studies support full infiltration BMPs? In the event that water balance effects are used to reject full infiltration (anticipated to be rare), additional analysis shall be completed and documented by a qualified professional indicating the site-specific information evaluated and the technical basis for this finding. OYes; Answer "Yes" to Criteria 2 Result. 0 No; Answer "No" to Criteria 2 Result. Can infiltration greater than 0.5 inches per hour be allowed without causing potential water balance issues such as change of seasonality of ephemeral streams? OYes; Continue to Part 1 Result. O No; Continue to Part 1 Result. The City of San Diego I Storm Water Standards Worksheet C.4-2 : Form I-8B I January 2018 Edition SD]J --' Categori~ation of Infiltration Feasibiiity Condition based on W ksh t C _ . F I-SB2 ·:. d d 1 d. . or ee .4 2. orm Groun water an Water Ba ance Con 1tions . •• { I Summarize potential water balance effects. Documentation should focus on mapping and soil data regarding proximity to ephemeral streams and groundwater depth. Part 1 -Full Infiltration Groundwater and Water Balance Screening Result3 If answers to Criteria 1 and 2 are "Yes", a full infiltration design is potentially feasible. The feasibility screening category is Full Infiltration based on groundwater conditions. Result If answer to Criteria 1 or Criteria 2 is "No'', infiltration may be possible to some O Full Infiltration extent but would not generally be feasible or desirable to achieve a "full Q Complete Part 2 infiltration" design based on groundwater conditions. Proceed to Part 2 . 3 To be completed using gathered site information and best professional judgement considering the definition of MEP in the MS4 Permit. Additional testing and/or studies may be required by City Engineer to substantiate findings. 5 The City of San Diego I Storm Water Standards Worksheet C.4-2 : Form 1-88 I January 2018 Edition SDJJ ~cktegorization of Infiltration Feasibility Condition based on w ksh t C -. F I-8B2 G d d W B I C d. . or ee .4 2. orrn roun water an ater a ance on 1t1ons Part 2 -Partial vs. No Infiltration Feasibility Screening Criteria DMA(s) Being Analyzed: Project Phase: Criteria 3: Groundwater Screening Contaminated Soil/Groundwater. Are partial infiltration BMPs proposed at least 100 feet away from contaminated soil or groundwater sites? This can be confirmed using GeoTracker (geotracker.waterboards.ca.gov) to identify open contaminated sites. This criterion is intentionally a smaller radius than full infiltration, as the potential quantity of infiltration from partial infiltration BMPs is smaller. 0 Yes; Answer "Yes" to Criteria 3 Result. 0 No ; However, site layout changes can be proposed to avoid contaminated soils or soils that lack adequate treatment capacity. Select "Yes" to Criteria 3 Result. It is a requirement for the SWQMP preparer to identify potential mitigation measures. 0 No; Contaminated soils or soils that lack adequate treatment capacity cannot be avoided and partial infiltration BMPs are not feasible. Select "No" to Criteria 3 Result. Criteria 3 Result: Can infiltration of greater than or equal to 0.05 inches/hour and less than or equal to 0.5 inches/hour be allowed without increasing risk of groundwater contamination that cannot be reasonably mitigated to an acceptable level? O Yes; Continue to Part 2, Criteria 4. 0 No; Skip to Part 2 Result. Summarize findings and basis. Documentation should focus on mapped soil types and contaminated site locations. 6 The City of San Diego I Storm Water Standards Worksheet C.4-2 : Form 1-88 I January 2018 Edition SDJJ i•cit~g~rizati~·.; 'of htfiltration Feasibility C~ndition b;s~d on w k h C ~ . F I ,. l~-8B2 ' · G. d' · d I d" . or s eet .4 2. orm roun water an Water Ba ance Con 1t1ons -~. - Criteria 4: Water Balance Screening Additional studies. In the event that water balance effects are used to reject partial infiltration (anticipated to be rare), a qualified professional must provide an analysis of the incremental effects of partial infiltration BMPs on the water balance compared to incidental infiltration under a no infiltration scenario (e.g. precipitation, irrigation, etc.). Criteria 4 Result: Can infiltration of greater than or equal to 0 .05 inches/hour and less than or equal to 0.5 inches/hour be allowed without causing potential water balance issues such as change of seasonality of ephemeral streams? 0Yes: Continue to Part 2 Result. 0 No: Continue to Part 2 Result. Summarize potential water balance effects. Documentation should focus on mapping and soil data regarding proximity to ephemeral streams and groundwater depth. Part 2 -Partial Infiltration Groundwater and Water Balance Screening Result4 If answers to Criteria 3 and Criteria 4 are "Yes", a partial infiltration design is potentially feasible. The feasibility screening category is Partial Infiltration based on groundwater and water balance conditions. If answer to Criteria 3 or Criteria 4 is "No", then infiltration of any volume is considered to be infeasible within the site. The feasibility screening category is No Infiltration based on groundwater or water balance condition. Result OPartial Infiltration Condition 0 No Infiltration Condition 4 To be completed using gathered site information and best professional judgement considering the definition of MEP in the MS4 Permit. Additional testing and/or studies may be required by City Engineer to substantiate findings. 7 The City of San Diego I Storm Water Standards Worksheet C.4-2 : Form 1-88 I January 2018 Edition SDJ r The City of Project Name Ionia L SAN DIEGO]) BMPID Bioflltration 88lin 1 (DMA-1 I r-1~• u ,.,,,r:111nT :ac ,1•:l'11•uu,111• ,,., . 1•1111~1{:H t: 'i1T~T .. 1a '.L'"tlli I. 1 Area draining to the 8MP 17 sq. ft. r 2 Adjusted runoff factor for drainage area (Refer to Appendix 8.1 and 8.2) 0.85 3 85th percentile 24-hour rainfall depth o ... inches 4 Design capture volume [Line 1 x Line 2 x (Line 3/12)] 1326 cu. ft. I BMP Parameters ... 5 Surface ponding [6 inch minimum, 12 inch maximum] 12 inches 6 Media thickness (18 inches minimum], also add mulch layer and washed ASTM 33 fine 24 inches aggregate sand thickness to this line for sizing calculations r 7 Aggregate storage (also add ASTM No 8 stone) above underdrain invert (12 inches 12 inches t typical) -use O inches if the aggregate is not over the entire bottom surface area 8 Aggregate storage below underdrain invert (3 inches minimum) -use O inches if the 3 inches r aggregate is not over the entire bottom surface area L 9 Freely drained pore storage of the media 0.2 in/in 10 Porosity of aggregate storage 0.4 in/in I L Media filtration rate to be used for sizing (maximum filtration rate of 5 in/hr. with no outlet control; if the filtration rate is controlled by the outlet use the outlet controlled rate (includes 11 infiltration into the soil and flow rate through the outlet structure) which will be less than 5 1.068 in/hr. in/hr.) I-Baseline Calculations r 12 Allowable routing time for sizing 6 hours 13 Depth filtered during storm ( Line 11 x Line 12] 6.348 inches L Depth of Detention Storage 14 22.8 inches r [Line 5 + (Line 6 x Line 9) + (Line 7 x Line 10) + (Line 8 x Line 1 O)] I 15 Total Depth Treated (Line 13 + Line 14] 29.148 inches Option 1 -Biofilter 1.5 times the DCV r 16 Required biofiltered volume [1 .5 x Line 4] 1990 cu. ft. L 17 Required Footprint [Line 16/ Line 15] x 12 819 sq. ft. Option 2 -Store 0.75 of remaining DCV in pores and ponding . 18 Required Storage (surface+ pores) Volume [0.75 x Line 4] 995 cu. ft. L 19 Required Footprint [Line 18/ Line 14] x 12 524 sq. ft. I I - Footprint of the BMP 8MP Footprint Sizing Factor (Default 0.03 or an alternative minimum footprint sizing factor I 20 from Line 11 in Worksheet 8.5-4) 0.03 21 Minimum 8MP Footprint [Line 1 x Line 2 x Line 20] 955 sq. ft. 22 Footprint of the 8MP = Maximum(Minimum(Line 17, Line 19), Line 21) 955 sq. ft. 23 Provided 8MP Footprint 2,000 sq. ft. 24 Is Line 23 ~ Line 22? Yes, Performance Standard is Met Worksheet B.5-1 Line 11 Media Filtration Rate: (0.049 cfs)/2,000 sq ft*3600sec)*(12 in/ft)= 1.058 in/hr Note: 0.049 cfs is the Max Flow Rate for the subdrain orifice cap computed in BMP Sizing Spreadsheet V3.1 within Attachment 2 of this SWQMP. 6/14/2021 Version 1.0 -June 2017 OMA 2-MWS-1 Flow-Based Sizing for Compact Biofiltration 1 Area tributary to BMP (s) A= 1.18 acres Area-weighted runoff factor (estimate using Appendix 2 8.2) C= 0.85 unitless 3 Design rainfall intensity i= 0.2 in/hr 4 Calculate Flow Rate = 1.5 x (C xix A) Q= 0.301 cfs 5 Proprietary biofiltration flow rate treatment capacity Q= 0.346 cfs OMA 3-MWS-2 Flow-Based Sizing for Compact Biofiltration 1 Area tributary to BMP (s) A= 2.05 acres Area-weighted runoff factor (estimate using Appendix 2 B.2) C= 0.85 unitless 3 Design rainfall intensity i= 0.2 in/hr 4 Calculate Flow Rate= 1.5 x (C xix A) Q= 0.523 cfs 5 Proprietary biofiltration flow rate treatment capacity Q= 0.577 cfs The City of Project Name Ionia SAN DIEGO]i BMPID Blotlltration Bain 2 toti•• ... ~ ""' _, ~.11,1 ■ 1,a. ,1111u:111• ,~-,1•r.j■ .. lll!H:.11111 •'•'f,1 IL'"'41f~"1• 1 Area draining to the 8MP 2, ,198 sq. ft. 2 Adjusted runoff factor for drainage area (Refer to Appendix 8 .1 and 8.2) 0.9 3 85th percentile 24-hour rainfall depth 0.5 inches 4 Design capture volume [Line 1 x Line 2 x (Line 3/12)] 1020 cu. ft. BMP Parameters 5 Surface ponding [6 inch minimum, 12 inch maximum] 12 inches 6 Media thickness [18 inches minimum], also add mulch layer and washed ASTM 33 fine 24 inches aggregate sand thickness to this line for sizing calculations 7 Aggregate storage (also add ASTM No 8 stone) above underdrain invert (12 inches 12 inches typical) -use O inches if the aggregate is not over the entire bottom surface area 8 Aggregate storage below underdrain invert (3 inches minimum) -use O inches if the 3 inches aggregate is not over the entire bottom surface area 9 Freely drained pore storage of the media 0.2 in/in 10 Porosity of aggregate storage 0.4 in/in Media filtration rate to be used for sizing (maximum filtration rate of 5 in/hr. with no outlet 11 control; if the filtration rate is controlled by the outlet use the outlet controlled rate (includes 0.884 in/hr. infiltration into the soil and flow rate through the outlet structure) which will be less than 5 in/hr.) Baseline Calculations 12 Allowable routing time for sizing 6 hours 13 Depth filtered during storm [ Line 11 x Line 12] 5.904 inches 14 Depth of Detention Storage [Line 5 + (Line 6 x Line 9) + (Line 7 x Line 10) + (Line 8 x Line 1 O)] 22.8 inches 15 Total Depth Treated [Line 13 + Line 14] 28.704 inches Option 1 -Biofilter 1.5 times the DCV 16 Required biofiltered volume [1.5 x Line 4] 1530 cu. ft. 17 Required Footprint [Line 16/ Line 15] x 12 640 sq. ft. Option 2 -Store 0. 75 of remaining DCV in pores and ponding 18 Required Storage (surface+ pores) Volume [0.75 x Line 4] 765 cu. ft. 19 Required Footprint [Line 18/ Line 14] x 12 403 sq. ft. Footprint of the BMP 20 8MP Footprint Sizing Factor (Default 0.03 or an alternative minimum footprint sizing factor 0.03 from Line 11 in Worksheet 8.5-4) 21 Minimum 8MP Footprint [Line 1 x Line 2 x Line 20] 734 sq. ft. 22 Footprint of the 8MP = Maximum(Minimum(Line 17, Line 19), Line 21) 734 sq. ft. 23 Provided 8MP Footprint 1,581 sq. ft. 24 Is Line 23 2: Line 22? Yes, Performance Standard is Met Worksheet B.5-1 Line 11 Media Filtration Rate: (0.036 cfs)/1 ,581 sq ft*3600sec)*(12 in/ft)= 0.984 in/hr Note: 0.036 cfs is the Max Flow Rate for the subdrain orifice cap computed in BMP Sizing Spreadsheet V3.1 within Attachment 2 of this SWQMP. 6/17/2021 Version 1.0 -June 201 "i ---OMA 5-MWS-3 -Flow-Based Sizing for Compact Biofiltration --1 Area tributary to BMP (s) A= 1.7 acres Area-weighted runoff factor (estimate using Appendix -2 B.2) C= 0.90 unitless -3 Design rainfall intensity i= 0.2 in/hr --4 Calculate Flow Rate= 1.5 x (C xix A) Q= 0.459 cfs -5 Proprietary biofiltration flow rate treatment capacity Q= 0.462 cfs ---------... ----------------- DMA 6-MWS-4 Flow-Based Sizing for Compact Biofiltration 1 Area tributary to BMP (s) A= Area-weighted runoff factor (estimate using Appendix 2 B.2) C= 3 Design rainfall intensity i= 4 Calculate Flow Rate= 1.5 x (C xi x A) Q= 5 Proprietary biofiltration flow rate treatment capacity Q= 1.7 acres 0.87 unitless 0.2 in/hr 0.444 cfs 0.462 cfs .. 11111 11111 .. 11111 -.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 11111 - --ATTACHMENT 2 BACKUP FOR PDP HYDROMODIFICATION CONTROL MEASURES -... [This is the cover sheet for Attachment 2.] -Indicate which Items are Included behind this cover sheet: -Attachment Contents Checklist -Sequence ... Attachment 2a Hydromodification Management Ii Included Exhibit (Required) -See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. -Attachment 2b Management of Critical Coarse ~ Exhibit showing project drainage Sediment Yield Areas (WMAA Exhibit boundaries marked on WMAA -is required, additional analyses are Critical Coarse Sediment Yield -optional) Area Map (Required) -See Section 6.2 of the BMP Design Optional analyses for Critical Coarse Manual. Sediment Yield Area Determination -□ 6.2.1 Verification of Geomorphic -Landscape Units Onsite □ 6.2.2 Downstream Systems -Sensitivity to Coarse Sediment -□ 6.2.3 Optional Additional Analysis of Potential Critical Coarse -Sediment Yield Areas Onsite -Attachment 2c Geomorphic Assessment of Receiving 81 Not performed -Channels (Optional) □ Included -See Section 6.3.4 of the BMP Design -Manual. -Attachment 2d Flow Control Facility Design and ~ Included Structural BMP Drawdown -Calculations (Required) -See Chapter 6 and Appendix G of the BMP DesiQn Manual ---------- Use this checklist to ensure the required information has been included on the Hydromodification Management Exhibit: The Hydromodification Management Exhibit must identify: ~ Underlying hydrologic soil group ~ Approximate depth to groundwater ~ Existing natural hydrologic features ( watercourses, seeps, springs, wetlands) ~ Critical coarse sediment yield areas to be protected (if present) ~ Existing topography ~ Existing and proposed site drainage network and connections to drainage offsite ~ Proposed grading ~ Proposed impervious features ~ Proposed design features and surface treatments used to minimize imperviousness ~ Point(s) of Compliance (POC) for Hydromodification Management ~ Existing and proposed drainage boundary and drainage area to each POC (when necessary, create separate exhibits for pre-development and post-project conditions) ~ Structural BMPs for hydromodification management (identify location, type of BMP, and size/detail) .. 111111 .. .. -.. .. .. .. .. .. .. .. .. .. .. .. .. m -N D N -----,-... - -----(J) <( z z w 7 <( 9 X "-I (/) ,-... O'.) N O'.) -/ <( """ <( fr / """ 0 a Cl:'. I / :,c 0 u CL Cl:'. 8 Cl:'. w " <( m :,c Cl:'. "' m -(11 LL <( u 0 Michael Baker INTERNATIONAL ~ 9755 Clairemont Mesa Boulevard (11 San Diego, CA 92124 :::::: .. _ Phone: (858) 614-5000 · MBAKERINTL.COM I I o. 0 / /,:;;ry / / l / / / ./ / .f --- r I DM,A.-1 / i ~ / I 0 --EXISTING 48" STOR M DR AI N / -- 50 25 0 50 100 150 I ~---1~~~~1---1 SCALE: 1 "=50' LEGEND OV ERA LL BAS I N LIMIT BASIN ID NUM BER PO I NT OF COM PL IANC E LIMITS Or WO RK -- ION IS LOTS 21 AND 22 HMP EXH IBIT -PRE-PROJECT COND IT ION ::, <( st N 01 -N 0 N ---"' ----<D <( z z w --, . '<' °' <( _J u (!) "' 0 [L ~ (/) z 0 -I "' O'.) -N O'.) -/ °' w f- <( a,, ::, °' 0 f- (/) / 0 0 <( u / (/) - "' O'.) N O'.) -/ <( f-< 0 [L / f-0 0 °' I / ::, 0 u Q_ °' 0 u °' w " <( m ::, -(/) LL -<( STORAGE VAULT 2 760 SF X 10' 7,850 CU FT MW S-2 8'X 20' BIOFILTRA TION BASIN 2 1,550 SF .STORAGE VAULT 3 760 SF X 10' 7,300 CU FT Michael Baker INT ER NATIONAL u 0 z 9755 Clairemont Mesa Boulevard <( U1 San Diego, CA 92124 ::::: .__ Phone: (858) 614-5000 · MBAKERINTL.COM I I, I -- ~MA -3 I ., MW S-3 8'X 16' ,; '· V l'f \ STOR AGE VAULT 1 768 SF X 6' 4,530 CU FT MWS-1 8'x12' EXISTI NG 48 " STORM DRAIN BIOFILTR ATION BASI N 1 2,000 SF MW S-4 8'X16' .D -)" STORAGE VAULT 4 1 ,024 SF X 7' 7,340 CU FT EXISTI NG 48" STOR M DRAIN 50 25 0 50 100 150 1--~1----i __ i--i SCALE: 1 "=50' LEGEND OV ERAL L BASI N LIMIT -- BASIi\ ID NUMB ER DM,1\-X POIN T OF COMP LIA NCE (POC) w MODULAR WETLANJ SYSTEM 1100 11 STORAGE VAULT PERV-I DUS-VERSUS I MPERV I DUS BOUNDARY NO TES NO NATURA L HYDROLOGIC FE ATUR ES CURR ENTLY EXIST ON SI TE AL L SOILS URBAN LANDS SOIL TYPE ''D'' GROUNDWAT ER DE PTH EXCEEDS 20 FEET NO CRITICA L COARSE SEDIM ENT YI ELD AR EAS EXIS-ON SI TE. REFER TO AT TACHME N-;-2b REFE R TO AT TACH MENT 1B FOR OMA SUMMARY SOURCE CONTR OL BMPS 1 . PR EVEN TION OF ILL ICIT DISCHARGES INTO MS4 (4 .2 . 1) 2 . STORM DRAIN STENCIL I NG OR SIGNAGE (4 .2.2 ) 3. PROTECT TRASH STORAGE AREAS (4 2 .5) SITE DES IGN BMPS 1 . CONSERVE NATURAL AREAS ( 4 . 3. 2) 2. MINI MIZE IMPERVIOUS AREAS (4.3 .3 ) 3. MINIMIZE SOIL CO MPACTION (4 3 4) 4. IMPERVIOUS AREA DISPERSION (4 .3 5) 5. LANDSCAPING WI TH NATIVE OR DROUGH T TO LERANT SPECI ES (4 3 7) IONIS LOTS 21 AND 22 HMP EXHIBIT -POST-PROJECT CONDITION w (/) 0::: <( 0 (/) (..) <( .JW <( 0::: (..) <( -o I-_J 0::: w (..)-_J >-<( 1--z 1-w z~ w_ 1-0 ow a.. (/) z ::5 a.. w 1-(/) 0 w (/) 0 a.. 0 0::: a.. BMP Sizing Spreadsheet V3. l Project Name: lonis Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 353,266 Parcel (APN): 0 Low Flow Threshold: 0.102 BMP Name: BIOFILTRATION BASIN 1 BMPType: Biofiltration BMP Native Soil Type: N/ A • Impervious Uner BMP Infiltration Rate (in/hr): N/A Areas Draining to BMP HMP Sizing Factors Minimum BMP Size Area we1gmea Kunon OMA Pre Project Soil Post Project Factor Surface Area Surface Area (SF) Name Area (sf) Type Pre-Project Slope Surface Type (Table G.2-1)' OMA 1-Impervious 26,445 D Flat Mixed 1.00 0.07 1851 OMA 1 -Pervious 11,007 0 Flat Mixed 0.10 0.07 77 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BMP Tributary Area 37,452 Minimum BMP Size 1928 Proposed BMP Size' 2000 I• Surface Ponding Depth 12.00 in I' Assumes standard configuration Bioretention Soil Media Depth 18.00 in Filter Coarse 6.00 in Gravel Storage Layer Depth 12 in Underdrain Offset 3.0 in Notes: 1. Runoff factors which are used for hydromodification management flow control (Table G.2•1) are different from the runoff factors used for pollutant control BMP sizing (Table B.l·l). Table references are taken from the San Diego Region Model BMP Design Mam Describe the BMP's in sufficient detail in your POP SWQMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site. BMP's must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head. Designated Staff have final review and approval authority over the project design. This BMP Sizing Spreadsheet has been updated in conformance with the San Diego Region Model BMP Design Manual, May 2018. For questions or concerns please contact the jurisdiction in which your project is located. BMP Sizing Spreadsheet V3.l Project Name: lonis Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 353,266 Parcel (APN): 0 Low Flow Threshold: 0.1Q2 BMP Name BIOFILTRATION BASIN 1 BMP Type: Biofiltration OMA Rain Gauge Pre-developed Condition Unit Runoff Ratio OMA Area (ac) Orifice Flow· %Q2 Orifice Area Name Soil Type Slope (cfs/ac) (cfs) (in2) OMA 1 -Impervious Oceanside D Flat 0.571 0.607 0.035 0.49 OMA 1 -Pervious Oceanside D Flat 0.571 0.253 0.014 0.21 3.75 0.049 0.70 0.94 Max Orifice Head Max Tot. Allowable Max Tot. Allowable Max Orifice Orifice Flow Orifice Area Diameter (feet) (ds) (in2) (in) 0.029 0.031 0.44 0.750 Average outflow during Max Orifice Outflow Actual Orifice Area Selected surface drawdown Orifice Diameter (cfs) (cfs) (in2) (in) Drawdown (Hrs) 19.3 BMP Sizing Spreadsheet V3.l Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 3S3,266 Parcel (APN): 0 Low Flow Threshold: 0.1Q2 BMPName: MWS-1 BMPType: Cistern BMP Native Soil Type: N/A -Impervious Liner BMP Infiltration Rate (in/hr): NA Areas Draining to BMP HMP Sizing Factors Minimum BMP Size Area we,gmeo Kunorr OMA Pre Project Soil Post Project Factor Volume Volume(CF) Name Area (sf) Type Pre-Project Slope Surface Type (Table G.2-1)' OMA 2 -Impervious 36,1B2 0 Flat Mixed 1.00 0.12 4342 OMA 2 • Pervious 15,194 0 Flat Mixed 0.10 0.12 1B2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BMP Tributary Area 51,376 Minimum BMP Size 4524 Proposed BMP Size• !• Assumes standard configuration Standard Cistern Depth (OVerflow Elevation) 3.5 ft Provided Cistern Depth (OVerflow Elevation) 3.5 ft Minimum Required Cistern Footprint) 1293 CF Notes: l. Runoff factors which are used for hydromodification management flow control (Table G.2•1} are different from the runoff factors used for pollutant control BMP sizing {Table 8.1·1). Table references are taken from the San Diego Region Model BMP Design Mam Describe the BMP's in sufficient detail in your POP SWQMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site. BMP's must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head. Designated Staff have final review and approval authority over the project design. This BMP Sizing Spreadsheet has been updated in conformance with the San Diego Region Model BMP Design Manual, May 2018. For questions or concerns please contact the jurisdiction in which your project is located. BMP Sizing Spreadsheet V3.l Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 3S3,266 Parcel (APN): 0 Low Flow Threshold: 0.1Q2 BMP Name MWS-1 BMP Type: Cistern OMA Rain Gauge Pre-developed Condition Unit Runoff Ratio OMA Area (ac) Orifice Flow -%Q2 Orifice Area Name Soil Type Slope (cfs/ac) (cfs) (in2) OMA 2 -Impervious Oceanside D Flat 0.571 0.831 0.047 0.70 OMA 2 -Pervious Oceanside D Flat 0.571 0.349 0.020 0.29 3.50 0-067 0.99 1.12 Max Orifice Head Max Tot. Allowable Max Tot. Allowable Max Orifice Orifice Flow Orifice Area Diameter (feet) (cfs) (in2) (in) Provide Hand Cale. 0.053 0.79 1.000 Average outflow during Max Orifice Outflow Actual Orifice Area Selected surface drawdown Orifice Diameter (cfs) (cfs) (in2) (in) Drawdown (Hrs) BMP Sizing Spreadsheet V3.l Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 353,266 Parcel (APN): 0 Low Flow Threshold: 0.102 BMP Name: MWS-2 BMPType: astern BMP Native Soil Type: NIA-Impervious Liner BMP Infiltration Rate (in/hr): NA Areas Draining to BMP HMP Sizing Factors Minimum BMP Size Area we1gmea Kunorr DMA Pre Project Soil Post Project Factor Volume Volume (CF) Name Area (sf) Type Pre-Project Slope Surface Type (Table G.2·1)1 OMA 3 -Impervious 62,692 D Flat Mixed 1.00 0.12 7523 OMA 3 • Pervious 26,646 D Flat Mixed 0.10 0.12 320 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BMP Tributary Area 89,338 Minimum BMP Size 7843 Proposed BMP Size• 1• Assumes standard configuration Standard Cistern Depth (Overflow Elevation) 3.5 ft Provided Cistern Depth (OVerflow Elevation) 3.5 ft Minimum Required Cistern Footprint) 2241 CF Notes: 1. Runoff factors which are used for hydromodification management flow control (Table G.2-1) are different from the runoff factors used for pollutant control BMP sizing (Table B.l•l). Table references are taken from the San Diego Region Model BMP Design Mam Describe the BM P's in sufficient detail in your POP SWQMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site. BMP's must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head. Designated Staff have final review and approval authority over the project design. This BMP Sizing Spreadsheet has been updated in conformance with the San Diego Region Model BMP Design Manual, May 2018. For questions or concerns please contact the jurisdiction in which your project is located. BMP Sizing Spreadsheet V3.1 Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 3S3,266 Parcel (APN): 0 Low Flow Threshold: 0.1Q2 BMP Name MWS-2 BMPType: Cistern OMA Rain Gauge Pre-developed Condition Unit Runoff Ratio OMA Area (ac) Orifice Flow -%Q2 Orifice Area Name Soil Type Slope (cfs/ac) (cfs) (in2) OMA 3 -Impervious Oceanside D Flat 0.571 1.439 0.082 1.21 OMA 3 -Pervious Oceanside D Flat 0.571 0.612 0,035 0.52 3.50 0.117 1.73 1.48 Max Tot. Allowable Max Tot. Allowable Max Orifice Max Orifice Head Orifice Flow Orifice Area Diameter (feet) (cfs) (in2} (in) Provide Hand Cale. 0.053 0.79 1.000 Average outflow during Max Orifice Outflow Actual Orifice Area Selected surface drawdown Orifice Diameter (cfs) (cfs) (in2) (in) Drawdown (Hrs) BMP Sizing Spreadsheet V3.l Project Name: lonis Lots 21 and 22 Hydrologic Unit: C.rlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 353,266 Parcel (APN): 0 Low Flow Threshold: 0.1Q2 BMP Name: BIOFILTRATION BASIN 2 BMPType: Biofiltration BMP Native Soil Type: NIA-Impervious Liner BMP Infiltration Rate (in/hr): N/A Areas Draining to BMP HMP Sizing Factors Minimum BMP Size Area we1gntea Kunon OMA Pre Project Soil Post Project Factor Surface Area Surface Area (SF) Name Area (sf) Type Pre-Project Slope Surface Type (Table G.2-1)1 OMA 4 -Impervious 21,577 D Flat Mixed 1.00 0.07 1510 OMA 4 • Pervious 5,619 D Flat Mixed 0.10 0.07 39 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BMP Tributary Area 27,196 Minimum BMP Size 1550 Proposed BMP Size• 1550 I, • Assumes standard configuration Surface Ponding Depth in Bioretention Soil Media Depth 18.00 in Filter Coarse 6.00 in Gravel Storage Layer Depth 12 in Underdrain Offset 3.0 in Notes: 1. Runoff factors which are used for hydromodification management flow control (Table G.2-1) are different from the runoff factors used for pollutant control BMP sizing (Table 8.1·1). Table references are taken from the San Diego Region Model BMP Design ManL Describe the BMP's in sufficient detail in your POP SWQMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site. BMP's must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head. Designated Staff have final review and approval authority over the project design. This BMP Sizing Spreadsheet has been updated in conformance with the San Diego Region Model BMP Design Manual, May 2018. For questions or concerns please contact the jurisdiction in which your project is located. BMP Sizing Spreadsheet V3.1 Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 353,266 Parcel (APN): 0 Low Flow Threshold: 0.1Q2 BMP Name BIOFILTRATION BASIN 2 BMPType: Biofiltration OMA Rain Gauge Pre-developed Condition Unit Runoff Ratio OMA Area (ac) Orifice Flow -%Q2 Orifice Area Name Soil Type Slope (cfs/ac) (cfs) (in2) OMA 4 -Impervious Oceanside D Flat 0.571 0.495 0.028 0.47 OMA 4 -Pervious Oceanside D Flat 0.571 0.129 0.007 0.12 2.75 0.036 0.59 0.87 Max Orifice Head Max Tot. Allowable Max Tot. Allowable Max Orifice Orifice Flow Orifice Area Diameter (feet) (ds) (in2) (in) 0.047 0.047 0 .79 1.000 Average outflow during Max Orifice Outflow Actual Orifice Area Selected surface drawdown Orifice Diameter (cfs) (cfs) (in2) (in) Drawdown (Hrs) 0.0 BMP Sizing Spreadsheet V3.l Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of C.rlsbad Total Project Area: 353,266 Parcel (APN): 0 Low Flow Threshold: 0.1Q2 BMPName: MWS-3 BMPType: Cistern BMP Native Soil Type: N/A -Impervious Liner BMP Infiltration Rate (in/hr): NA Areas Draining to BMP HMP Sizing Factors Minimum BMP Size Area we1gt1ted Runoff OMA Pre Project Soil Post Project Factor Volume Volume(CF) Name Area (sf) Type Pre-Project Slope Surface Type (Table G.2-1)1 OMA 5 -Impervious 59,307 0 Flat Mixed 1.00 0.12 7117 OMA 5 -Pervious 14,548 0 Flat Mixed 0.10 0.12 175 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BMP Tributary Area 73,855 Minimum BMP Size 7291 Proposed BMP Size• -I, • Assumes standard configuration Standard Cistern Depth (Overflow Elevation) 3.5 ft Provided Cistern Depth (Overflow Elevation) 3.5 ft Minimum Required Cistern Footprint) 2083 CF Notes: 1. Runoff factors which are used for hydromodification management flow control (Table G.2·1) are different from the runoff factors used for pollutant control BMP sizing {Table B.l·l). Table references are taken from the San Diego Region Model BMP Design Mam Describe the BMP's in sufficient detail in your PDP SWQMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site. BMP's must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head. Designated Staff have final review and approval authority over the project design. This BMP Sizing Spreadsheet has been updated in conformance with the San Diego Region Model BMP Design Manual, May 2018. For questions or concerns please contact the jurisdiction in which your project is located. BMP Sizing Spreadsheet V3.1 Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 353,266 Parcel {APN): 0 Low Flow Threshold: 0.1Q2 BMP Name MWS-3 BMPType: Cistern DMA Rain Gauge Pre-developed Condition Unit Runoff Ratio DMA Area (ac) Orifice Flow -%Q2 Orifice Area Name Soil Type Slope (cfs/ac) (cfs) (in2) DMA 5 -Impervious Oceanside D Flat 0.571 1.362 O.Q78 1.15 DMA 5 -Pervious Oceanside D Flat 0.571 0.334 0.019 0.28 3.50 0.097 1.43 1.35 Max Tot. Allowable Max Tot. Allowable Max Orifice Max Orifice Head Orifice Flow Orifice Area Diameter (feet) (cfs) (in2) (in) Provide Hand Cale. 0.053 0.79 1.000 Average outflow during Max Orifice Outflow Actua I Orifice Area Selected surface drawdown Orifice Diameter (cfs) (cfs) (in2) (in) Drawdown (Hrs) BMP Sizing Spreadsheet V3.1 Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 353,266 Parcel (APN): 0 Low Flow Threshold: 0.102 BMPName: MW5-4 BMPType: Ostern BMP Native Soil Type: NIA-Impervious Liner BMP Infiltration Rate (in/hr): NA Areas Draining to BMP HMP Sizing Factors Minimum BMP Size Area weIgmea Kunon OMA Pre Project Soil Post Project Factor Volume Volume(CF) Name Area (sf) Type Pre-Project Slope Surface Type (Table G.2-1)1 DMA 6 -Impervious 59,655 D Flat Mixed 1.00 0.12 7159 OMA 6 -Pervious 14,393 D flat Mixed 0.10 0.12 173 D 0 D 0 D 0 0 0 0 0 D 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BMP Tributary Area 74,048 Minimum BMP Size 7331 Proposed BMP Size• • Assumes standard configuration Standard Cistern Depth (Dverflow Elevation) 3.5 ft Provided Cistern Depth (Overflow Elevation) 35 ft Minimum Required Cistern Footprint} 2095 CF Notes: 1. Runoff factors which are used for hydromodification management flow control (Table G.2-1) are different from the runoff factors used for pollutant control BMP sizing (Table 8.1-1}. Table references are taken from the San Diego Region Model BMP Design Mam Describe the BM P's in sufficient detail in your POP SWQMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site. BMP1s must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head. Designated Staff have final review and approval authority over the project design. This BMP Sizing Spreadsheet has been updated in conformance with the San Diego Region Model BMP Design Manual, May 2018. For questions or concerns please contact the jurisdiction in which your project is loca~d. BMP Sizing Spreadsheet V3.1 Project Name: lonis Lots 21 and 22 Hydrologic Unit: Carlsbad 904 Project Applicant: MBI Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 353,266 Parcel (APN): 0 Low Flow Threshold: 0.1Q2 BMP Name MW5-4 BMPType: Cistern OMA Rain Gauge Pre-developed Condition Unit Runoff Ratio OMA Area (ac) Orifice Flow -%Q2 Orifice Area Name Soil Type Slope (cfs/ac) (cfs) (in2) OMA 6 -Impervious Oceanside D Flat 0.571 1.369 0.078 1.15 OMA 6 -Pervious Oceanside D Flat 0.571 0.330 0.019 0.28 3.50 0.097 1.43 1.35 Max Tot. Allowable Max Tot. Allowable Max Orifice Max Orifice Head Orifice Flow Orifice Area Diameter (feet) (cfs) (in2) (in) Provide Hand Cale. 0.053 0.79 1.000 Average outflow during Max Orifice Outflow Actual Orifice Area Selected surface drawdown Orifice Diameter (cfs) (cfs) (in2) (in) Drawdown (Hrs) ------ ----------------------- ------- ATTACHMENT 3 Structural BMP Maintenance Information Use this checklist to ensure the required information has been included in the Structural BMP Maintenance Information Attachment: Preliminary Design/Planning/CEQA level submittal: Attachment 3 must identify: o Typical maintenance indicators and actions for proposed structural BMP(s) based on Section 7.7 of the BMP Design Manual Final Design level submittal: Attachment 3 must identify: o Specific maintenance indicators and actions for proposed structural BMP(s). This shall be based on Section 7.7 of the BMP Design Manual and enhanced to reflect actual proposed components of the structural BMP(s) o How to access the structural BMP(s) to inspect and perform maintenance o Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, or other features that allow the inspector to view necessary components of the structural BMP and compare to maintenance thresholds) o Manufacturer and part number for proprietary parts of structural BMP(s) when applicable o Maintenance thresholds for BMPs subject to siltation or heavy trash(e.g., silt level posts or other markings shall be included in all BMP components that will trap and store sediment, trash, and/or debris, so that the inspector may determine how full the BMP is, and the maintenance personnel may determine where the bottom of the BMP is . If required, posts or other markings shall be indicated and described on structural BMP plans.) □ Recommended equipment to perform maintenance □ When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management * NOTE -This will be provided at a later submittal. ----ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit --[Use the City's standard Single Sheet BMP Plan.] ---* NOTE -This will be provided at a later submittal. ---------------------------