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HomeMy WebLinkAboutSDP 2017-0003; CARLSBAD OAKS NORTH LOT 6; STORM WATER QUALITY MANAGEMENT PLAN; 2018-09-18CITY OF CARLSBAD PRIORITY DEVELOPMENT PROJECT (PDP) PRELIMINARY STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR Carlsbad Oaks North Lot 6 SDP2017-0003 tJNGINEER OF WORK: Danny Abada, P.E. PREPARED FOR: Owner/Subdivider: Carlsbad Oaks North Ventures, LP Attn. Ted Tchang 3575 Kenyon St. San Diego, CA 92110 (619) 223-1663 PREPARED BY: SPEAR & ASSOCIATES, INC. CIVIL ENGINEERING & LAND SURVEYING 475 Production Street San Marcos, CA 92078 Telephone: (760) 736-2040 DATE: 9/18/18 C t'L/ OCT 1 0 2018 \jJ 1, 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: OMA 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 CERTIFICATION PAGE Project Name: Carlsbad Oaks North Lot 6 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. Danny Aba, p, P.E. RCE 45381 Expiration 9/30/20 t/ Spear & Associates Inc. Company 9/18/18 Date PROJECT VICINITY MAP I .... ( [Insert City's Storm Water Standard Questionnaire (Form E-34) here] C ci~yof Carlsbad STORM WATER STANDARDS QUESTIONNAIRE Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov E-34 j INSTRUCTIONS: 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' requ irements 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: Carlsbad Oaks North, Lot 6 PROJECT ID: SDP2017-0003 ADDRESS: N.W. Comer ofWhiptail Loop and Faraday Ave. APN: 209-012-05 The project is (check one):~ew Development D Redevelopment The total proposed disturbed area is: 3482500 ft2 ( 8.0 ) acres The total proposed newly created and/or replaced impervious area is: 2382378 ft2 ( 6.51 ) 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 02/16 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 □ 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 you 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; □ b) Designed and constructed to be hydraulically disconnected from paved streets or roads; c) Designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets quidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in □ f£" 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? □ ~ 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, ao to Step 3. E-34 Page 2 of 4 REV 04/17 To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)): 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, and ublic develo ment ro ·ects on ublic or rivate 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 more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public develo ment ro ·ects on ublic or riv ate 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 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 develo ment ro·ect includes develo ment on an natural slo e that is twent -five ercent or reater. 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 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 trans ortation of automobiles, trucks, motorc cles, 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 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 ro ·ect to the ESA i.e. not comm in led with flows from ad·acent 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 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 RGO 's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily Traffic 'ADT of 100 or more vehicles er da . 10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land 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 1 0%? (CMC 21 .203.040 YES NO □ □ □ □ □ □ □ 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 statin "M ro·ect is a 'STANDARD PROJECT' .. ." and com lete a licant information. E-34 Page 3 of 4 REV 04/17 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 (8) = sq. ft. Percent impervious area created or replaced (8/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 BM P's required for PDP apply to the entire development. Go to step 5, check the check the first box stating "My project is a PDP ... " and complete applicant information. STEPS CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION 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. □ 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 Applicant Name: Applicant Title: Applicant Signature: Date: .. * 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 Citv Use Onlv YES NO City Concurrence: □ □ By: Date: Project ID: E-34 Page 4 of 4 REV 04/17 SITE INFORMATION CHECKLIST Project Summary Information Project Name Carlsbad Oaks North Lot 6 Project ID ISDP2017-0003 Project Address IWhiptail Loop, Carlsbad, CA 92008 Assessor's Parcel Number(s) (APN(s}} 209-120-05 Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area 11.55 Acres (503,121 Sauare Feet} Existing Impervious Area (subset of Parcel Area} 0 Acres (0 Square Feet) Area to be disturbed by the project (Proiect Area} 8.0 Acres (348,500 Square Feet) Project Proposed Impervious Area (subset of Proiect Area) 6.51 Acres (283,378 Square Feet) Project Proposed Pervious Area (subset of Project Area) 5.04 Acres (219,743 Square Feet) 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): Existing development X Previously graded but not built out □ Agricultural or other non-impervious use □ Vacant, undeveloped/natural Description/ Additional Information: The site includes an existing single family residence. Existing Land Cover Includes (select all that apply): X Vegetative Cover □ Non-Vegetated Pervious Areas □ Impervious Areas Description/ Additional Information: The site is mostly bare and covered with patches of native grass. Underlying Soil belongs to Hydrologic Soil Group (select all that apply): D NRCS Type A NRCS Type B D NRCS Type C X NRCS Type D Approximate Depth to Groundwater (GW): D GW Depth < 5 feet □ 5 feet < GW Depth < 1 0 feet X 10 feet < GW Depth < 20 feet GW Depth > 20 feet Existing Natural Hydrologic Features (select all that apply): □ Watercourses □ Seeps □ Springs □Wetlands XNone 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]: The existing drainage is urban. The project area is generally flat with approximately 1.0% grades and is divided by westerly and easterly facing slopes with elevations ranging approximately between 400 and 320. !The site drainage is directed to an existing offsite detention basin, previously designed to attenuate future development increases in flow rate. The Basin is located west of the project site near the intersection on Faraday Avenue and El Fuerte Street. (Refer to "Hydrology Study for Carlsbad Oaks North Phase 2, CT 97- 13-02" prepared by O'Day Consultants Inc. Dated 11/1/2005 and Revised 7 /31/2006).The drainage then continues to Encinitas Creek and the Pacific Ocean . conveyed trough the site No offsite runoff Description of Proposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: Proposed land use is commercial development with a parking lot and associated underground utilities, landscaping, and biofiltration for stormwater treatment . List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): Building rooftops, driveways and hardscape. List/describe proposed pervious features of the project (e.g., landscape areas): Landscaping and biofiltration. Does the project include grading and changes to site topography? XYes □No Description/ Additional Information: The development will require minor grading onsite; however, slope patterns will be significantly maintained as in pre-development. Does the project include changes to site drainage (e.g ., installation of new storm water conveyance systems)? XYes □No Description/ Additional Information: Proposed drainage will maintain existing site characteristics and will include biofiltration for stormwater treatment. The stormwater will be directed to easterly and westerly biofiltration basins fitted with overflow risers. Their flow will be directed new stromdrains exiting the site northwesterly and southeasterly. Peak flows will be attenuated to pre-development rates by an existing offsite detention basin located west of the project site near the intersection on Faraday Avenue and El Fuerte Street. (Refer to "Hydrology Study for Carlsbad Oaks North Phase 2, CT 97-13-02" prepared by O'Day Consultants Inc. Dated 11/1/2005 and Revised 7 /31/2006).The drainage then continues to Encinitas Creek and the Pacific Ocean. Identify whether any of the following features, activities, and/or pollutant source areas will be present (select all that apply): X On-site storm drain inlets □ Interior floor drains and elevator shaft sump pumps □ Interior parking garages □ Need for future indoor & structural pest control X Landscape/Outdoor Pesticide Use □ Pools, spas, ponds, decorative fountains, and other water features □Foodservice X Refuse areas □ Industrial processes □ Outdoor storage of equipment or materials □ Vehicle and Equipment Cleaning □ Vehicle/Equipment Repair and Maintenance □ Fuel Dispensing Areas □ Loading Docks X Fire Sprinkler Test Water □ Miscellaneous Drain or Wash Water X 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): Peak flows will be attenuated to pre-development rates by an offsite detention basin located west of the project site near the intersection on Faraday Avenue and El Fuerte Street. Before reaching this detention basin, runoff from the project site will be treated for water quality by two additional existing offsite detention basins. The first basin is located approximately 900' west of the project site, on the south side of Faraday Avenue. The second basin is located approximately 800' east of the project site, also on the south side of Faraday Avenue. The drainage then continues to Encinitas Creek and 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 !Encinitas Creek Selenium, Toxicity 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 IX Sediment X Nutrients IX D( Heavy Metals b< OrQanic Compounds IX Trash & Debris Oxygen Demanding b< Substances b< Oil & Grease IX Bacteria & Viruses IX Pesticides Hydromodification Management Requirements Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)? X 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. □ 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. □ No, the project will discharge runoff directly to an area identified as appropriate for an exemption by the WMAA 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 Yield Areas* *This Section onlv reauired if hvdromodification management requirements aooly Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas exist within the project drainage boundaries? □Yes X No, No critical coarse sediment yield areas to be protected based on WMAA maps If yes, have any of the optional analyses presented in Section 6.2 of the BMP Design Manual been performed? □ 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite □ 6.2.2 Downstream Systems Sensitivity to Coarse Sediment □ 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite □ No optional analyses performed, the project will avoid critical coarse sediment yield areas identified based on WMAA maps If optional analyses were performed, what is the final result? □ No critical coarse sediment yield areas to be protected based on verification of GLUs onsite □ 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: Flow CCritontrol for Post-Project Runotr *This Section only reauired if hydromodlfication management reauirements apply 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. POC 1 @ the NW corner of the site. POC 2 @ the SE corner of the site. Has a geomorphic assessment been performed for the receiving channel(s)? X No, the low flow threshold is 0.102 (default low flow threshold) □ Yes, the result is the low flow threshold is 0.102 □ Yes, the result is the low flow threshold is 0.302 □ Yes, the result is the low flow threshold is 0.502 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. Infiltration based treatment BMPs are not feasible, according to Worksheet C.4-1 "Categorization of Infiltration Condition" prepared by the geotechnical consultant. Optional Additional Information or Continuation of Previous Sections As Needed This space provided for additional information or continuation of information from previous sections as needed. [Insert City's Standard Project Requirement Checklist Form E-36 (here)] Project Name: Carlsbad Oaks Project ID: SDP2017-0003 DWG No. or Building Permit No.: STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Proiect Information North Lot 6 Source Control BMPs 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 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. • "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 I Aoolied? SC-1 Prevention of Illicit Discharges into the MS4 I ~Yes I □ No I □ N/A Discussion/justification if SC-1 not implemented: SC-2 Storm Drain Stenciling or Signage I ~ Yes I □ No I □ N/A Discussion/justification if SC-2 not implemented: SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, I □Yes I □ No I CT N/A Runoff, and Wind Dispersal Discussion/justification if SC-3 not implemented: none proposed. SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, I □Yes I □ No I ~ N/A Runoff, and Wind Dispersal Discussion/justification if SC-4 not implemented: none proposed SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind I f1:!:Yes I □ No I □ N/A Dispersal Discussion/justification if SC-5 not implemented: E-36 Page 1 of 3 REV 02/16 Source Control Requirement Aoolied? 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 ~Yes D No D N/A □ Interior floor drains and elevator shaft sump pumps □Yes D No [x N/A □ Interior parking garages □Yes D No IX N/A o Need for future indoor & structural pest control □Yes D No Qg N/A ex Landscape/Outdoor Pesticide Use ~Yes D No D N/A □ Pools, spas, ponds, decorative fountains, and other water features □Yes D No ~ N/A □ Food service □Yes D No IX N/A QI: Refuse areas r2.'Yes D No ~ NIA □ Industrial processes □Yes D No Xl N/A □ Outdoor storage of equipment or materials □Yes D No xJ N/A □ Vehicle and Equipment Cleaning □Yes D No XJ N/A □ Vehicle/Equipment Repair and Maintenance □Yes D No xJ N/A □ Fuel Dispensing Areas □Yes D No xJ N/A □ Loading Docks □Yes D No ~ N/A ~ Fire Sprinkler Test Water ~Yes D No D NIA □ Miscellaneous Drain or Wash Water □Yes D No ~ N/A ~ Plazas, sidewalks, and parking lots ~Yes D No D N/A For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers. E-36 Page 2 of 3 REV. 02/16 Appendix E: BMP Design Fact Sheets E.1 Source Control BMP Requirements Worksheet E.1-1: Source Control BMP Requirements How to comply: Projects must comply with this requirement by implementing all source control BMPs listed in this section that are applicable and feasible for their project. Applicability must be determined through consideration of the development project's features and anticipated pollutant sources. Appendix E.1 provides guidance for identifying source control BMPs applicable to a project. The Standard and PDP SWQMP templates include sections that must be used to document compliance with source control BMP requirements. How to use this worksheet: 1. Review Column 1 and identify which of these potential sources of storm water pollutants apply to your site. Check each box that applies. 2. Review Column 2 and incorporate all of the corresponding applicable BMPs in your project site plan. 3. Review Columns 3 and 4 and incorporate all of the corresponding applicable permanent controls and operational BMPs in a table in your project- specific storm water management report. Describe your specific BMPs in an accompanying narrative, and explain any special conditions or situations that required omitting BMPs or substituting alternatives. E-3 February 26, 2016 If These Sources Will Be on the Project Site ... 1 Potential Sources of Runoff Pollutants IZJ A. Onsite storm drain inlets D Not .Applicable ~ Appendix E: BMP Design Fact Sheets . .. Then Your SWQMP Must Consider These Source Control BMPs 2 Permanent Controls-Show on Drawings Locations of inlets. 3 Permanent Controls-List in Table and Narrative liEI Mark all inlets with the words "No Dumping! Flows to Bay" or similar. See stencil template provided in Appendix I-4 E-4 4 Operational BMPs-Include in Table and Narrative Kl Maintain and periodically repaint or replace inlet markings. El Provide storm water pollution prevention information to new site owners, lessees, or operators. }CJ See applicable operational BMPs in Fact Sheet SC-44, ''Drainage System Maintenance," in the CASQA Storm Water Quality Handbooks at www.casqa.org/resources/bmp- handbooks/municipal-bmp- handbook. Qa Include the following in lease agreements: "Tenant shall not allow anyone to discharge anything to storm drains or to store or deposit materials so as to create a potential discharge to storm drains." February 26, 2016 If These Sources Will Be on the Project Site ... □ 12:) □ ~ 1 Potential Sources of Runoff Pollutants B. Interior floor drains and elevator shaft sump pumps Not Aeelicable C. Interior parking garages Not Applicable □ D1. Need for future indoor & structural pest control ~ Not Applicable Appendix E: BMP Design Fact Sheets . .. Then Your SWQMP must consider These Source Control BMPs 2 Permanent Controls-Show on Drawings 3 Permanent Controls-List in Table and Narrative □ State that interior floor drains and elevator shaft sump pumps will be plumbed to sanitary sewer. □ State that parking garage floor drains will be plumbed to the sanitary sewer. □ Note building design features that discourage entry of pests. E-5 4 Operational BMPs-lnclude in Table and Narrative □ Inspect and maintain drains to prevent blockages and overflow. □ Inspect and maintain drains to prevent blockages and overflow. □ Provide Integrated Pest Management information to owners, lessees, and operators. February 26, 2016 If These Sources Will Be on the Project Site ... 1 Potential Sources of Runoff Pollutants IXl D2. Landscape/ Outdoor Pesticide Use 0 Not Applicable Appendix E: BMP Design Fact Sheets . .. Then Your SWQMP must consider These Source Control BMPs 2 Permanent Controls-Show on Drawings 123 c ~ Show locations of existing trees or areas of shrubs and ground cover to be undisturbed and retained. Show self-retaining landscape areas, if any. Show storm water treatment facilities. 3 Permanent Controls-List in Table and Narrative State that final landscape plans will accomplish all of the following. lJ Preserve existing drought tolerant trees, shrubs, and ground cover to the maximum extent possible. ~ Design landscaping to rmrunuze irrigation and runoff, to promote surface infiltration where appropriate, and to minimize the use of fertilizers and pesticides that can contribute to storm water pollution. Cll Where landscaped areas are used to retain or detain storm water, specify plants that are tolerant of periodic saturated soil conditions. Ck Consider using pest-resistant plants, especially adjacent to hardscape. ~ To ensure successful establishment, select plants appropriate to site soils, slopes, climate, sun, wind, rain, land use, air m ovement, ecological consistency, and plant interactions. E-6 4 Operational BMPs-lnclude in Table and Narrative ~ Maintain landscaping using minimum or no pesticides. q See applicable operational BMPs in Fact Sheet SC-41, "Building and Grounds Maintenance," in the CASQA Storm Water Quality Handbooks at www.casqa.org/resources/bmp -handbooks/municipal-bmp- handbook. ~ Provide IPM information to new owners, lessees and operators. February 26, 2016 If These Sources Will Be on the Project Site ... 1 Potential Sources of Runoff Pollutants □ E. Pools, spas, ponds, decorative fountains, and other water features. ~ Not Applicable □ F. Food service ~ Not Applicable Appendix E: BMP Design Fact Sheets . .. Then Your SWQMP must consider These Source Control BMPs 2 Permanent Controls-Show on Drawings □ Show location of water feature and a sanitary sewer cleanout in an accessible area within 10 feet. 3 Permanent Controls-List in Table and Narrative □ If the local municipality requires pools to be plumbed to the sanitary sewer, place a note on the plans and state in the narrative that this connection will be made according to local requirements. □ For restaurants, grocery stores, I □ Describe the location and features of the designated cleaning area. and other food service operations, show location I 0 (indoors or in a covered area outdoors) of a floor sink or other area for cleaning floor mats, containers, and equipment. □ On the drawing, show a note that this drain will be connected to a grease interceptor before discharging to the sanitary sewer. Describe the items to be cleaned in this facility and how it has been sized to ensure that the largest items can be accommodated. E-7 4 Operational BMPs-Include in Table and Narrative □ See applicable operational BMPs in Fact Sheet SC-72, "Fountain and Pool Maintenance," in the CASQA Storm Water Quality Handbooks at www.casqa.org/resources /bm p-handbooks/municipal- bmp_-handbook. February 26, 2016 If These Sources Will Be on the Project Site 1 Potential Sources of W G. Refuse areas D Not Applicable Appendix E: BMP Design Fact Sheets ... Then Your SWQMP must consider These Source Control BMPs 2 Permanent Controls-Show on Drawings !XJ Show where site refuse and recycled materials will be handled and stored for pickup. See local municipal requirements for sizes and other details of refuse areas. l:zl If dumpsters or other receptacles are outdoors, show how the designated area will be covered, graded, and paved to prevent run- on and show locations of berms to prevent runoff from the area. Also show how the designated area will be protected from wind dispersal. 1:3 Any drains from dumpsters, compactors, and tallow bin areas must be connected to a grease removal device before discharge to sanitary sewer. 3 Permanent Controls-List in Table and Narrative l;i:I State how site refuse will be handled and provide supporting detail to what is shown on plans. ~ State that signs will be posted on or near dumpsters with the words "Do not dump hazardous materials here" or similar. E-8 4 Operational BMPs-lnclude in Table and Narrative lii:I State how the following will be implemented: Provide adequate number of receptacles. Inspect receptacles regularly; repair or replace leaky receptacles. Keep receptacles covered. Prohibit/ prevent dumping of liquid or hazardous wastes. Post "no hazardous materials" signs. Inspect and pick up litter daily and clean up spills immediately. Keep spill control materials available on-site. See Fact Sheet SC-34, ''Waste Handling and Disposal" in the CASQA Storm Water Quality Handbooks at www.casqa.org/resources/bmp- handbooks /municipal-bmp-handbook. February 26, 2016 1 Potential Sources of Runoff Pollutants D H. Industrial processes. :tl Not Applicable □ I. Outdoor storage of equipment or materials. (See rows J and K for source control measures for vehicle cleaning, repair, and maintenance.) ~ Not Applicable 2 Permanent Controls-Show on Drawings □ □ □ Show process area. Show any outdoor storage areas, including how materials will be covered. Show how areas will be graded and bermed to prevent run-on or runoff from area and protected from wind dispersal. Storage of non-hazardous liquids must be covered by a roof and/ or drain to the sanitary sewer system, and be contained by berms, dikes, liners, or vaults. □ Storage of hazardous materials and wastes must be in compliance with the local hazardous materials ordinance and a Hazardous Materials Management Plan for the site. Appendix E: BMP Design Fact Sheets 3 Permanent Controls-List in Table and Narrative □ If industrial processes are to be located onsite, state: "All process activities to be performed indoors. No processes to drain to exterior or to storm drain system." □ Include a detailed description of materials to be stored, storage areas, and structural features to prevent pollutants from entering storm drains. Where appropriate, reference documentation of compliance with the requirements of local Hazardous Materials Programs for: • Hazardous \Vaste Generation • Hazardous Materials Release Response and Inventory • California A ccidental Release Prevention Program • Aboveground Storage Tank • Uniform Fire Code Article 80 Section 103(6) & (c) 1991 • Underground Storage Tank E-9 4 Operational BMPs-Include in Table and Narrative Table and Narrative □ See Fact Sheet SC-10, "Non- Storm Water Discharges" in the CASQA Storm Water Quality Handbooks at htt:ps: // www.casqa.org/resou rces/bmp-handbooks. □ See the Fact Sheets SC-31, "Outdoor Liquid Container Storage" and SC-33, "Outdoor Storage of Raw Materials" in the CASQA Storm Water Quality Handbooks at www.casqa.org/resources/bm p-handbooks /municipal-bmp- handb_QQk. February 26, 2016 1 Potential Sources of Runoff Pollutants □ J. Vehicle and Equipment Cleaning Q!J Not Applicable 2 Permanent Controls-Show on Drawings □ Show on drawings as appropriate: (1) Commercial/industrial facilities having vehicle / equipment cleaning needs must either provide a covered, bermed area for washing act1v1t1es or discourage vehicle/ equipment washing by removing hose bibs and installing signs prohibiting such uses. (2) Multi-dwelling complexes must have a paved, bermed, and covered car wash area (unless car washing is prohibited onsite and hoses are provided with an automatic shut- off to discourage such use). (3) Washing areas for cars, vehicles, and equipment must be paved, designed to prevent run-on to or runoff from the area, and plumbed to drain to the sanitary sewer. ( 4) Commercial car wash facilities must be designed such that no runoff from the facility is discharged to the storm drain system. Wastewater from the facility must discharge to the sanitary sewer, or a wastewater reclamation system must be installed. E-10 3 Permanent Controls-List in Table and Narrative □ If a car wash area is not provided, describe measures taken to discourage onsite car washing and explain how these will be enforced. Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative Describe operational measures to implement the following (if applicable): □ Washwater from vehicle and equipment washing operations must not be discharged to the storm drain system. □ Car dealerships and similar may rinse cars with water only. □ See Fact Sheet SC-21, ''Vehicle and Equipment Cleaning," in the CASQA Storm Water Quality Handbooks at www.casga.org/resources/bm p-handbooks /municipal-bmp- handbook. February 26, 2016 If These Sources Will Be on the Project Site ... 1 Potential Sources of Runoff Pollutants □ K. Vehicle/Equipment Repair and Maintenance efl Not Applicable □ □ □ Appendix E: BMP Design Fact Sheets . .. Then Your SWQMP must consider These Source Control BMPs Permanent Controls-Show on Drawings Accommodate all vehicle equipment repair and maintenance indoors. Or designate an outdoor work area and design the area to protect from rainfall, run-on runoff, and wind dispersal. Show secondary containment for exterior work areas where motor oil, brake fluid, gasoline, diesel fuel, radiator fluid, acid- containing batteries or other hazardous materials or hazardous wastes are used or stored. Drains must not be installed within the secondary containment areas. Add a note on the plans that states either (1) there are no floor drains, or (2) floor drains are connected to wastewater pretreatment systems prior to discharge to the sanitary sewer and an industrial waste discharge permit will be obtained. Permanent Controls-List in Table and Narrative Operational BMPs-Include in Table and Narrative □ □ □ State that no vehicle repair or maintenance will be done In the report, note that all of the following restrictions apply to use the site: outdoors, or else describe the required features of the outdoor work area. State that there are no floor drains or if there are floor □ No person must dispose of, nor permit the disposal, directly or indirectly of vehicle fluids, hazardous materials, or rinsewater from parts cleaning into storm drains. drains, note the agency from I 0 which an industrial waste discharge permit will be obtained and that the design meets that agency's requirements. State that there are no tanks, containers or sinks to be used for parts cleaning or rinsing or, if there are, note the I □ agency from which an industrial waste discharge permit will be obtained and that the design meets that agency's requirements. E-11 No vehicle fluid removal must be performed outside a building, nor on asphalt or ground surfaces, whether inside or outside a building, except in such a manner as to ensure that any spilled fluid will be in an area of secondary containment. Leaking vehicle fluids must be contained or drained from the vehicle immediately. No person must leave unattended drip parts or other open containers containing vehicle fluid, unless such containers are in use or in an area of secondary containment. February 26, 2016 1 Potential Sources of Runoff Pollutants □ L. Fuel Dispensing Areas Xl Not Applicable 2 Permanent Controls-Show on Drawings □ Fueling areas 16 must have impermeable floors (i.e., portland cement concrete or equivalent smooth impervious surface) that are (1) graded at the minimum slope necessary to prevent ponding; and (2) separated from the rest of the site by a grade break that prevents run-on of storm water to the 11::EP. □ Fueling areas must be covered by a canopy that extends a minimum of ten feet in each direction from each pump. [Alternative: The fueling area must be covered and the cover's minimum dimensions must be equal to or greater than the area within the grade break or fuel dispensing area 1.) The canopy [or cover] must not drain onto the fueling area. 3 Permanent Controls-List in Table and Narrative Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative □ The property owner must dry sweep the fueling area routinely. □ See the Business Guide Sheet, "Automotive Service-Service Stations" in the CASQA Storm Water Quality Handbooks at https: / /www.casqa.org/resources /b mp-handbooks. 16 The fueling area must be defined as the area extending a minimum of 6.5 feet from the corner of each fuel dispenser or the length at which the hose and nozzle assembly may be operated plus a minimum of one foot, whichever is greater. E-12 February 26, 2016 1 Potential Sources of Runoff Pollutants M. Loading Docks Kl Not Applicable 2 Permanent Controls-Show on Drawings D Show a preliminary design for the loading dock area, including roofing and drainage. Loading docks must be covered and/ or graded to minimize run-on to and runoff from the loading area. Roof downspouts must be positioned to direct storm water away from the loading area. Water from loading dock areas should be drained to the sanitary sewer where feasible. Direct connections to storm drains from depressed loading docks are prohibited. D Loading dock areas draining directly to the sanitary sewer must be equipped with a spill control valve or equivalent device, which must be kept closed during periods of operation. D Provide a roof overhang over the loading area or install door skirts ( cowling) at each bay that enclose the end of the trailer. 3 Permanent Controls-List in E-13 Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative D Move loaded and unloaded items indoors as soon as possible. D See Fact Sheet SC-30, "Outdoor Loading and Unloading," in the CASQA Storm Water Quality Handbooks at www.casqa.org/resources /bmp- handbooks /municipal-bmp-handbook. February 26, 2016 1 Potential Sources of Runoff Pollutants ~ N. Fire Sprinkler Test Water □ Not Applicable 0. Miscellaneous Drain or Wash Water D Boiler drain lines D Condensate drain lines D Rooftop equipment D Drainage sumps D Roofing, gutters, and trim rn Not Applicable 2 Permanent Controls- Show on Drawings Appendix E: BMP Design Fact Sheets ~ 3 Permanent Controls-List in Table and Narrative Provide a means to drain fire sprinkler test water to the sanitary sewer. D Boiler drain lines must be directly or indirectly connected to the sanitary sewer system and may not discharge to the storm drain system. D Condensate drain lines may discharge to landscaped areas if the flow is small enough that runoff will not occur. Condensate drain lines may not discharge to the storm drain system. D Rooftop mounted equipment with potential to produce pollutants must be roofed and/ or have secondary containment. D Any drainage sumps onsite must feature a sediment sump to reduce the quantity of sediment in pumped water. D Avoid roofing, gutters, and trim made of copper or other unprotected metals that may leach into runoff. E-14 4 Operational BMPs-Include in Table and Narrative q See the note in Fact Sheet SC- 41, "Building and Grounds Maintenance," in the CASQA Storm Water Quality Handbooks at '..Vww.casqa.org/resources /bm p-handbooks/municipal-bmp- handbook February 26, 2016 1 Potential Sources of Runoff Pollutants Kl P. sidewalks, parking lots. D Not Applicable Plazas, and 2 Permanent Controls-Show on Drawings 3 Permanent Controls-List in Table and Narrative E-15 Appendix E: BMP Design Fact Sheets 4 Operational BMPs-Include in Table and Narrative IXI Plazas, sidewalks, and parking lots must be swept regularly to prevent the accumulation of litter and debris. Debris from pressure washing must be collected to prevent entry into the storm drain system. Washwater containing any cleaning agent or degreaser must be collected and discharged to the sanitary sewer and not discharged to a storm drain. February 26, 2016 Site Desian 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 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. • "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 Reaulrement I Aoolled? SD-1 Maintain Natural Drainage Pathways and Hydrologic Features I !Jl:Yes I D No I □ N/A Discussion/justification if SD-1 not implemented: SD-2 Conserve Natural Areas, Soils, and Vegetation I □Yes I D No I t:z: NIA Discussion/justification if SD-2 not implemented: None existing SD-3 Minimize Impervious Area I es Yes I □ No I □ N/A Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Compaction I ~Yes I D No I □ N/A Discussion/justification if SD-4 not implemented: SD-5 Impervious Area Dispersion l ~Yes I D No I □ N/A Discussion/justification if SD-5 not implemented: Note feasible due to distant location of landscaped areas SD-6 Runoff Collection I □Yes I □ No I n N/A Discussion/justification if SD-6 not implemented: Not feasible SD-7 Landscaping with Native or Drought Tolerant Species I ~Yes I □ No I □ N/A Discussion/justification if SD-7 not implemented: SD-8 Harvesting and Using Precipitation I □Yes I 5 No I □ N/A Discussion/justification if SD-8 not implemented: Not Feasible. Please refer to feasibility calculations on worksheet B.3-1 in attachment 1 E-36 Page 3 of 3 REV. 02/16 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 hydro modification 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. Infiltration based treatment is not feasible due to Type D soil and proximity of steep slopes according to Worksheet C.4-1 "Categorization of Infiltration Condition" prepared by the geotechnical consultant Biofiltration basins were selected as the most efficient BMP to treat the project's anticipated and expected pollutants. Biofiltration basins is used for treatment and hydromodification. Harvest and use was also found unfeasible due to the lack of space and low water use requirements for the proposed drought tolerant vegetation. Please refer to Worksheet 8-3-1 in attachment 1, for feasibility calculations. [Continue on next page as necessary.] [Continued from previous page -This page is reserved for continuation of description of general strategy for structural BMP implementation at the site.] Structural BMP Summary Information [Copy this page as needed to provide Information for each individual proposed structural BMP] Structural BMP ID No. Biofiltration Basin A Drainage Area Map Sheet No. 1 Type of structural BMP: □ Retention by harvest and use (HU-1) □ Retention by infiltration basin (I NF-1) □ Retention by bioretention (INF-2) □ Retention by permeable pavement (INF-3) □ Partial retention by biofiltration with partial retention (PR-1) X 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 X Combined pollutant control and hydromodification control □ Pre-treatment/forebay for another structural BMP □ Other (describe in discussion section below) Discussion (as needed): Structural BMP Summary Information [Copy this page as needed to provide information for each Individual proposed structural BMP] Structural BMP ID No. Biofiltration Basin 8 DrainaQe Area Map Sheet No. 1 Type of structural BMP: o 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) X Biofiltration (BF-1) o 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: Pollutant control only o Hydromodification control only X Combined pollutant control and hydromodification control o Pre-treatment/forebay for another structural BMP o Other (describe in discussion section below) Discussion (as needed): Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP] Structural BMP ID No. Biofiltration Basin C Drainage Area Map Sheet No. 1 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) D Retention by permeable pavement (INF-3) o Partial retention by biofiltration with partial retention (PR-1) X Biofiltration (BF-1) o 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 hydro modification management o Other (describe in discussion section below) Purpose: Pollutant control only o Hydromodification control only X Combined pollutant control and hydromodification control o Pre-treatment/forebay for another structural BMP o Other (describe in discussion section below) Discussion (as needed): Structural BMP Summary Information [Copy this page as needed to provide Information for each individual proposed structural BMP] Structural BMP ID No. Biofiltration Basin D Drainage Area Map Sheet No. 1 Type of structural BMP: D 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) o Partial retention by biofiltration with partial retention (PR-1) X Biofiltration (BF-1) o 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: Pollutant control only o Hydromodification control only X Combined pollutant control and hydromodification control D Pre-treatment/forebay for another structural BMP o Other (describe in discussion section below) Discussion (as needed): Structural BMP Summary Information [Copy this page as needed to provide Information for each individual proposed structural BMP] Structural BMP ID No. Biofiltration Basin E Drainage Area Map Sheet No. 1 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) X 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 X Combined pollutant control and hydromodification control □ Pre-treatment/forebay for another structural BMP □ Other (describe in discussion section below) Discussion (as needed): ATTACHMENT 1 ( \ BACKUP FOR PDP POLLUTANT CONTROL BMPS This is the cover sheet for Attachment 1. Check which Items are Included behind this cover sheet: Attachment Contents Checklist Seauence 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 B.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. X Included X Included on DMA Exhibit in Attachment 1 a □ Included as Attachment 1 b, separate from DMA Exhibit X Included □ Not included because the entire project will use infiltration BMPs X Included □ Not included because the entire project will use harvest and use BMPs Attachment 1 e Pollutant Control BMP Design X Included Worksheets/ Calculations (Required) Refer to Appendices B and E of the BMP Design Manual for structural pollutant control BMP design guidelines ATTACHMENT 1 Use this checklist to ensure the required information has been included on the DMA Exhibit: The OMA 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 and impervious areas □ 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 □ 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) <o ' b 340 3 3 Q 35 34 340 330 2-3" HARDWOOD MULCH MAINTENANCE CLEAN-OUT 355 34-5 CATCH BASIN EMERGENCY OVERFLOW STORM DRAIN STENCIL SD-13 ~~ "' 2§ -i:;J ~~ c:S tt (TO REMAIN CLOSED AT ALL TIMES) 6" MIN. FROM F. S. OF BASIN 3.00'(MIN.) BENCH I !----- WHEN NEXT TO A SLOPE I . ;;,,,-'--"-'-;J-----BASIN TOP (MIN.) AMENDED SOIL {K=5 IN/HR @ 40% POROSITY I: I VERTICAL SLOPE WASHED SAND OVER CHOKING STONE, ASTM NO. 8 IMPERVIOUS MEMBRANE {PER SOILS ENGINEER) MIN 24-MIL POLYETHYLENE LINER SUCH AS WESTERN ENVIRONMENTAL LINERS AQUA 24 (OR EQUIVALENT) W/ALL SEAMS HEAT WELDED ~ DRAIN SYSTEM -~«~: :y»;;i:-·~;,'¾S$;/ <tY <v('0(~_ / "· 6" DIA. PERFORATED PVC UNDERDRAIN 1/,,)..->:> '"'/ INSERT 6" DM. THREADED SLffl/£ & PVC CAP @ CONNECTION (INTERIOR SIDE OF CATCH BASIN). Sff ORIFICE TABLt FOR SIZING. BIOFIL TRA TION BASIN TYPICAL DETAIL & OUTLET CONNECTION NOT-TO-SCALE 6" PC.C. CURB PER SDRSD G-1 1% MIN. DEPTH PER SOILS ENGINEER (SEE NOTE HEREON) I: 7 VERTICAL SLOPE BASIN I A B C D E 40 395 --385 38 35 350 345 340 335 335 _ ~ 5 330 _,...,-- FARADAY AVENUE BIOFILTRATION BASIN MEDIA AMENDED SOIL LAYER COMPOSITION AND TEXTURE.· 65% SAND, 20% SANDY LOAM, & 75% COMPOST (FROM VEGETATION-BASED FEEDSTOCK). ANIMAL WASTES OR BY-PRODUCTS SHOULD NOT BE APPLIED. AMENDED SOIL LAYER DEPTH PER DETAIL PERMEABILITY· 5 IN/HR INFILTRATION RATE FOR THE FLOW-BASED SUSMP METHOD (I-6IN/HR FOR ALTERNATIVE DESIGNS, AS APPROVED BY LOCAL JURISDICTION}. CHEMICAL COMPOSITION: TOTAL PHOSPHORUS < 15 PARTS PER MILLION (PPM); PH 6-8; CATION EXCHANGE CAPACITY> 5 MILL/EQUIVALENTS PER JOO GRAMS (MEQ/100 G) OF SOIL; ORGANIC MATTER CONTENT < 5 PERCENT BY W£/GHT. DRAINAGE LA YER SEPARATE SOIL MEDM FROM UNDERDRAIN LAYER WITH 2 TO 4 INCHES OF WASHED SAND, FOLLOWED BY 2 INCHES or CHOKING STONE (ASTM NO. 8) OVER A I.0-FOOT ENVELOP[ OF ASTM NO. 57 STONE. TOTAL COMBINED DRAINAGE LAYER DEPTH PER DETAIL SURFACE VEGETATION AS SPECIFIEO BY THE LANDSCAPE ARCHITECT PLANS. BIOFIL TRATION BASIN DATA TABLE SIZE {SQ FT) ABOVE GRADE BELOW GRADE REQUIRED ORIFICE DEPTH (MIN) DEPTH {MIN) VOLUME {MIN) SIZE ~n) 2,770 7.33' 3.00' 3,767 CF 0.57" 7,700 7.33' 3.00' 8,270 CF 0.84" 7,240 7.33' 3.00' 8,435 CF 0.97" 6,275 1.33' 3.00' 7,310 CF 0.79" 78,530 7.33' 3.00' 21,579 CF 7.36" 4 C 395 3 DRAINAGE AREA SURFACE SYMBOL SOIL TYPE BUILDING ROOFTOP k)(/y"::-i I i ',...W TYPED PARKING/DRIVE AISLE I< . 'tl TYPED IMPERVIOUS AREA HARSCAPING/SIDEWALK I::. -,· ,I TYPED LANDSCAPING AREA 1-: · :-: -: ·I TYPED INDIVIDUAL TOTAL DMA AREA /4 / \ I \ I I ' \ \ \ \ I ' I l_( I C~ . E I \ \ I \ ..., \ ~ \ \ \ \\-----, -1) I SOP 2017-0003 LEGEND OF SYMBOLS ---( --- PRDPERTY LINE STRETT CENTERLINE EXISTING CDNTOURS DIRECTIDN DF DRAINAGE <FLDII PATH) LDNGEST FLOII PATH DRAINAGE MANAGEMENT AREA BDRDER DRMNAGE MANAGEMENT AREA DESIGNA TIDN PROPDSED STDRM DRAIN & CATCH BASIN (PVT> INTERIOR WALL 36''x36" CATCH BASIN INSERT 6" DIA. THREADED SLEEVE AND SCREW ON PVC CAP @ CONNECTION {INTERIOR SIDE OF CATCH BASIN). ( /1/ I 1-----J-6" DIA. PERFORATED PVC UNDERDRAIN CONNECTION {FROM BASIN) ORIFICE DRILLED THROUGH PVC CAP @ UNDERDRAIN CONNECTION. SEE ORIFICE TABLE. MAINTENANCE PVC CAP DETAIL ATTACH TO INTERIOR INLET WALL OF E~CE OUTLET SE"' 36''x36" CATCH BASIN STORM DRAIN STENCIL SD-13 SCALE: N 7 " 40' ASSESSOR'S PARCEL NO: 209-120-05 SITE ADDRESS WHIPTAIL LOOP, CARLSBAD, CA DRAINAGE AREA DMA BREAKDOWN DRAINAGE AREA A' DRAINAGE AREA '8' DRAINAGE AREA 'C' DRAINAGE AREA 'D' DRAINAGE AREA '£7' DRAINAGE AREA . '£2' DRAINAGE AREA "SM-I" DRAINAGE AREA "SM-2" DRAINAGE AREA ''SM-3" 4,904 SQ FT 78,480 SQ FT 76,270 SQ FT 73,639 SQ FT 15,417 SQ FT 33,154 SQ FT 0 SQ FT 0 SO FT 0 SQ FT 72,786 SQ FT 28,739 SQ FT 31,708 SQ FT 26,480 SQ FT 13,966 SQ FT 58,241 SQ FT 0 SQ FT 0 SQ FT 0 SQ FT 853 SQ FT 7,759 SQ FT 235 SQ FT 2,608 SQ FT 393 SQ FT 4,952 SQ FT 0 SQ FT 0 SQ FT 0 SQ FT 7,787 SQ FT 8,796 SQ FT 78,589 SQ FT 7,573 SQ FT 492 SQ FT 22,217 SQ FT 26,95B SQ FT 38,399 SO FT 89,592 SQ FT 25,730 SQ .FT 56,574 SQ FT 66,802 SQ FT 50,240 SQ FT 30,262 SQ FT 178,564 SQ FT 26,958 SQ FT 38,399 SO FT 89,592 SQ FT TOTAL LOT AREA = 503,727 SQ FT I SHlET I CITY OF CARLSBAD I SH~tTS I ENGINEERING DEPARTMENT DMA & HYDROMODIFICATION EXHIBIT FOR: LOT 6 CARLSBAD OAKS NORTH RECORD COPY PROJECT NO. I DRAWING NO. DA TE IN11lAL DATE IN11lAL DA TE INITIAL ENGINEER OF WORK REVISION DESCRIPTION OTHER APPROVAL CITY APPROVAL INITIAL DATE ~ ~ ''------------------------------------------------------------------------------------------------~-------------------------------------------------------------------~ --------------------------- ARtsou I 34 3 3 I --= ?5 BMP TABLE BMP ID# BMPTYPE SYMBOL CASQA NO. QUANTITY DRAWING NO. HYDROMODIFICATION & TREATMENT CONTROL ©-® BIORETENTION l>>t·•l TC-32 AREA 5 . LOW IMPACT DESIGN (L.I.D.) CD-@ ROOF DRAIN TO 1001 SD-11 LANDSCAPING 22 . SOURCE CONTROL @-@ TRASH w ENCLOSURE SD-32 6 . ®--® NO DUMPING STENCILS DRAINS TO SD-13 8 WATERWAYS . 40C 39 39 385 380 355 350 35 340 340 3.35 335 330 ----------__ \ ____ -'='.-.--~-□--------- ' -. I / -----_, ---✓---------_, -,,,-------/ // / I ----"-// ---~ _,/ ___ _ f'r -! FARADAY AVENUE INSPECTION * MAINTENANCE * SHEET NO.(S) FREQUENCY FREQUENCY . * * . ANNUALLY ANNUALLY . ANNUALLY ANNUALLY 40 20 0 40 . AS NEEDED AS NEEDED *30 JJAYS PRIDR TD DCTDBER 1ST EAC 80 BIOFIL TRA TION BASIN DAT A TABLE \ I \ SOP 2017-0003 BASIN# SIZE (SQ FT) ABOVE GRADE BELOW GRADE REQUIRED ORIFICE DEPTH (MIN) DEPTH (MIN) VOLUME (MIN) SIZE (in) 1, \ \ \ \ \ SWQMP NO. ____ _ A B C D E 34 335 120 2,770 1.33' 3.00' 3,161 CF 0.57" 7,100 1.33' 3.00' 8,270 CF 0.84" 7,240 1.33' 3.00' 8,435 CF 0.97" 6,275 1.33' 3.00' 7,310 CF 0.79" 18,530 1.33' 3.00' 21,579 CF 1.36" . I \ ) \ I • \ PARTY RESPONSIBLE FOR MAINTENANCE: NAME CARLSBAD OAKS NORTH VENTURE~ LP ADDRESS 3575 KENYON STREET SAN DIEGO CA 921/0 CONTACT TED TCHANG PHONE NO. (619) 223 1663 --=--------=,- 39 90 385 .380 4-.u 35C INTERIOR WALL 36''x36" CATCH BASIN 40 g- 39 INSERT 6" DIA. THREADED SLEEVE AND SCREW ON PVC CAP@ CONNECTION {INTERIOR SIDE OF CATCH BASIN). t----J--6" DIA. PERFORATED PVC UNDERDRAIN CONNECTION (FROM BASIN) . ORIFICE DRILLED THROUGH PVC CAP @ UNDERDRAIN CONNECTION. SEE ORIFIC[ TABLE. PERMEABILITY: 5 IN/HR INFILTRATION RATE FOR THE FLOW-BASED SUSMP METHOD ( l-6IN/HR FOR AUERNA TIVE DESIGNS, AS APPROVED BY LOCAL JURISDICTION). CHEMICAL COMPOSITION: TOTAL PHOSPHORUS < 15 PARTS PER MILLION (PPM)· PH 6-8· CATION EXCHANG[ CAPACITY> 5 MILL/EQUIVALENTS PER 100 GRAMS (MEQ/700 G) OF , SOIL; ORGANIC MATTER CONTENT < 5 PERCENT BY WEIGHT. DRAINAGE LA YER SEPARATE SOIL MfDIA FROM UNDERDRAIN LAYER WITH 2 TO 4 INCHES OF WASHED SAND FOLL!;WED BY 2 INCHES OF CHOKING STONE (ASTM NO. 8) OVER A I.0-FOOT ENVELOP[ OF A~TM NO. 57 STONE. TOTAL COMBINED DRAINAGE LAYER DEPTH PER DETAIL SURFACE VEGETATION CATCH BASIN EMERGENCY OVERFLOW STORM DRAIN STENCIL SD-I 3 3.00'(MIN.) BENCH WHEN NEXT TO A SLOPE I ~ PLAN PREPARED BY: NAME JOSHUA R. ZEIGLER COMPANY SPEAR & ASSOC/A TES INC. ADDRESS475 PROOUCTTON STREET SIGNATURE SAN MARCOS, CA 92078 PHONE NO. (760) 736-2040 BMPNOTES: CERTIFICATION ____ _ 1, THESE BMPSARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S RECOMMENDATIONS OR THESE PLANS. 2. NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 3. NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPES WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 4. NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF HAS INSPECTED THIS PROJECT FOR APPROPRIATE BMP CONSTRUCTION AND INSTALLATION. 5. REFER TO MAINTENANCE AGREEMENT DOCUMENT. 6. SEE PROJECT SWMP FOR ADDITIONAL INFORMATION. STORM DRAIN STENCIL SD-13 ASSESSOR'S PARCEL NO: 209-120-05 SITE ADDRESS WHIPTAIL LOOP, CARLSBAD, CA 2-3" HARDWOOD MULCH MAINTENANCE CLEAN-OUT (TO REMAIN CLOSED AT ALL TIMES) 6" MIN. FROM F.S. OF BASIN 6" P.C.C. CURB PER SDRSD G-I 1% MIN. MAINTENANCE PVC CAP DETAIL AS SP[CIFl[D BY THE LANDSCAPE ARCHITECT PLANS. ATTACH TO INTERIOR INLET WALL OF 36''x36" CATCH BASIN ,,-afESS Io,, 0 ,,,--::--~· '1( !)' *"' R. ?rlc <1 V) b ~ s. ;; '-c:, :::0 :Z ~ No. 85413 :::::; co * * J). "' '1;, CIV\\. ;i;:- f' or c,c 1,""" PLANS PREPARED B~ SPEAR & ASSOCIATES INC CIVIL ENGINEERING & LAND SURVEYING 475 PRODUCTION STREET, SAN MARCOS, CA 92078 PHONE (760) 736-2040 FAX (760) 736-4866 WWW.SPEARING.NET t--,===~==+=====================t===t==±===f==3 l=S~HE1~ET~l~C;;;;IT~Y~~O~F~C~A=R=L=S=B=A=D~l=SH~El=ET~S I I i~ ENGINEERING DEPARTMENT SINGLE SHEET BMP SITE PLAN LOT 6 CARLSBAD OAKS NORTH ~===t===t==================~===t==t==±==J ~==~-==,-=-=--=--=---=---=---=----=-~----__J I RECORD COPY PROJECT NO. Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods W kh B31H d U F 'b'li S . Harvest and Use Feasibility Screening Form 1-7 1. Is there a demand for harvested water ( check all that apply) at the project site that is reliably present during the wet season? IXI Toilet and urinal flushing IX] 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. Toilet & Urinal Flushing: 20 employees (36 hour total)= 44.1 c.f. Landscape Irrigation: Total Planted Area 219,743 s.f., w/drought tolerant low water use (36 hour total) = 177 c.f. Anticipated Total Use Over 36 hours = 221 c.f. 3. Calculate the DCV using worksheet B-2.1. 13,441 c.f. 0.25 DCV = 3,360 c.f. 3a. Is the 36-hour demand greater than or equal to the DCV? Yes /X No q ij 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 0.25DCV but less than the full DCV? Yes /X No ~ 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. 3c. Is the 36-hour demand less than 0.25DCV? XYes Harvest and use is considered to be infeasible. X Appendix I: Forms and Checklists Factor of Safety and Design Infiltration Rate Worksheet Form 1-9 Factor Category Factor Description Assigned Factor Product (p) Weight (w) Value (v) p =wxv Soil assessment methods 0.25 2 0.5 0 Predominant soil texture 0.25 1 0.25 Suitability Site soil variability 0.25 2 0.50 A Assessment Depth to groundwater I 1 0.25 unperv1ous 0.25 layer Suitability Assessment Safety Factor, SA = Ip 1. 50 Level of pretreatment/ expected 0.5 0 sediment loads B Design Redundancy/ resiliency 0.25 2 0 .50 Compaction during construction 0.25 0 Design Safety Factor, Sa = Ip 0.50 Combined Safety Factor, S,ocal= s_\ X Sa 2.0 Observed Infiltration Rate, inch/hr, Kob,ervcd see 1 on (corrected for test-specific bias) C.4-1 below see 1 o n Design Infiltration Rate, in/hr, :K!csign = Kob,cmd / Sco,al C.4-1 below Supporting Data Briefly describe infiltration test and provide reference to test forms: See Tables B-VI and B-Vll below. 1-10 January 25, 2016 TABLE B-VI (Concluded SUITABILITY ASSESSMENT RELATED CONSIDERATIONS FOR INFILTRATION FACILITY SAFETY FACTORS Consideration High Medium Low Concern -3 Points Concern -2 Points Concern -1 Point Predominant Soil Silty and clayey soils Loamy soils Granular to slightly Texture with significant fines loamy soils Highly variable soils Soil boring/test pits Soil boring/test pits indicated from site Site Soil Variability assessment or unknown indicate moderately indicate relatively variability homogenous soils homogenous soils Depth to Groundwater/ <5 feet below 5-15 feet below > 15 feet below Impervious Layer facility bottom facility bottom facility bottom Based on our geotechnical investigation and the previous table, Table B-VII presents the estimated factor values for the evaluation of the factor of safety. This table only presents the suitability assessment safety factor (Part A) of the worksheet. The project civil engineer should evaluate the safety factor for design (Part B) and use the combined safety factor for the design infiltration rate. TABLE B-VII FACTOR OF SAFETY WORKSHEET DESIGN VALUES -PART A1 Suitability Assessment Factor Category Assigned Factor Product Weight (w) Value (v) (p = W XV) Assessment Methods 0.25 2 0.50 Predominant Soil Texture 0.25 I 0.25 Site Soil Variability 0.25 2 0.50 Depth to Groundwater/ Impervious Layer 0.25 1 0.25 Suitability Assessment Safety Factor, SA= Ip 1.50 1 The project civil engineer should complete Worksheet D.5-1 or Form 1-9 using the data on this table. Additional information is required to evaluate the design factor of safety. Project No. G2064-11-01 -B-6 • August 15, 2017 Categorization of Infiltration Feasibility Condition Worksheet C.4-1 Part 1 -Full Infiltration Feasibility Screening Criteria Would infiltration of the full design volume he feasible from a physical perspective without any undesirable consequences that cannot he reasonably mitigated? Criteria Screening Question Is the estimated reliable infiltration rate below proposed facility locations greater than 0.5 inches per hour? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2 and Appendix D. Provide basis: Yes No X !We performed seven Aardvark Permeameter tests at the site within existing compacted fill and granitic rock. The !following presents the results of our field infiltration tests: P-1 at 3.5 feet in Basin B: 0.204 inches/hour (0.1 inches per hour with FOS=2) P-2 at 3.6 feet in Basin A: 0.082 inches/hour (0.04 inches/hour with FOS=2) P-3 at 3.3 feet in Basin C: 0.331 inches/hour (0.166 inches/hour with FOS=2) P-4 at 3.4 feet in Basin B: 0.059 inches/hour (0.03 inches/hour with FOS=2) P-5 at 2.1 feet in Basin B: 0.025 inches/hour (0.01 inches/hour with FOS=2) P-6 at 2.2 feet in NE Basin: 0.038 inches/hour (0.02 inches/hour with FOS=2) P-7 at 3.8 feet in NE Basin: 0.038 inches/hour (0.02 inches/hour with FOS=2) The average infiltration rate for compacted fills is 0.103 inches/hour with a FOS=2. The average infiltration rate for granitic rock is 0.02 inches/hour with a FOS=2. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 2 Can infiltration greater than 0.5 inches per hour he allowed without increasing risk of geotechnical hazards ( slope stability, groundwater mounding, utilities, or other factors) that cannot he mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2. Provide basis: X Infiltration should not be allowed within the existing compacted fill and adjacent to existing fill slopes due to the potential damage to proposed and existing improvements. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. Project No. G2064-ll-0l -B-7 -August 15, 2017 Criteria 3 Provide basis: Worksheet C.4-1 Page 2 of 4 Screening Question Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of groundwater contamination (shallow water table, storm water pollutants or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. We expect groundwater is at least 50 feet from the existing elevations. Yes No X Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 4 Provide basis: 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 or increased discharge of contaminated groundwater to surface waters? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. X We do not expect infiltration will cause water balance issues such as seasonality of ephemeral streams or increased discharge of contaminated groundwater to surface waters. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. Part 1 Result* If all answers to rows 1 -4 are ''Yes" a full infiltration design is potentially feasible. The feasibility screening category is Full Infiltration If any answer from row 1-4 is "No", infiltration may be possible to some extent but would not generally be feasible or desirable to achieve a "full infiltration" design. Proceed to Part 2 No Full Infiltration *To be completed using gathered site information and best professional Judgment cons1denng the definition ofMEP 1n the MS4 Permit. Additional testing and/or studies may be required by the City to substantiate findings. Project No. G2064-11-01 -B-8 -August 15, 2017 Worksheet C.4-1 Page 3 of 4 Part 2 -Partial Infiltration vs. No Infiltration Feasibility Scrcenin,gCriteria Would infiltration of water in any appreciable amount be physically feasible without any negative consequences that cannot be reasonably mitigated? Criteria 5 Provide basis: Screening Question Do soil and geologic conditions allow for infiltration in any appreciable rate or volume? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2 and AppendixD. Yes No X We performed seven Aardvark Permeameter tests at the site within previously existing fill and granitic rock. The !following presents the results of our field infiltration tests: P-1 at 3.5 feet in Basin B: 0.204 inches/hour (0.102 inches per hour with FOS=2) P-2 at 3.6 feet in Basin A: 0.082 inches/hour (0.041 inches/hour with FOS=2) P-3 at 3.3 feet in Basin C: 0.331 inches/hour (0.17 inches/hour with FOS=2) P-4 at 3.4 feet in Basin B: 0.059 inches/hour (0.030 inches/hour with FOS=2) P-5 at 2.1 feet in Basin B: 0.025 inches/hour (0.013 inches/hour with FOS=2) P-6 at 2.2 feet in NE Basin: 0.038 inches/hour (0.019 inches/hour with FOS=2) P-7 at 3.8 feet in NE Basin: 0.038 inches/hour (0.019 inches/hour with FOS=2) The average infiltration rate for compacted fills is 0.103 inches/hour with a FOS=2. The average infiltration rate for granitic rock is 0.02 inches/hour with a FOS=2. Partial infiltration is considered infeasible within compacted fill far Basins A and C since the fill depth is greater than 5 feet according to the manual. Partial infiltration within granitic rock for Basins B and D is considered infeasible based on the measured infiltration rates ef less than 0. 05 inches per hour. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates. 6 Provide basis: Can Infiltration in any appreciable quantity be allowed without increasing risk of geotechnical hazards (slope stability, groundwater mounding, utilities, or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2. X Infiltration should not be allowed within the existing compacted fill and adjacent to existing slopes due to the potential damage to proposed and existing improvements. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates. Project No. G2064-11-01 -B-9 • August 15, 2017 Criteria 7 Provide basis: Worksheet C.4-1 Page 4 of 4 Screening Question Can Infiltration in any appreciable quantity be allowed without posing significant risk for groundwater related concerns (shallow water table, storm water pollutants or other factors)? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. We expect groundwater is at least 50 feet from the existing elevations. Yes No X Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates. 8 Provide basis: Can infiltration be allowed without violating downstream water rights? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. X We did not provide a study regarding water rights. However, these rights are not typical in the San Diego County area. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates. Part2 Result* If all answers from row 1-4 are yes then partial infiltration design is potentially feasible. The feasibility screening category is Partial Infiltration. If any answer from row 5-8 is no, then infiltration of any volume is considered to be infeasible within the drainage area. The feasibility screening category is No Infiltration. No Infiltration *To be completed using gathered site information and best professional judgment considering the definition of MEP in the MS4 Permit. Additional testing and/or studies may be required by the City to substantiate findings. Project No. G2064-ll-0l -B-10 -August 15, 2017 Appendix B: Storm Water Pollutant Control H ydrologic Calculations and Sizing Methods Worksheet B.2-1 DCV DMAA A= 0.59 acres Area weighted runoff factor (estimate using Appendix B.1.1 and C= 0.66 unitless 4 Trees Credit Volwne TCV= cubic-feet 5 Rain barrels Credit Volwne RCV= cubic-feet 6 Calculate DCV = (3630 x C x d x A) -TCV -RCV DCV= 876 cubic-feet -1 85th percentile 24-hr storm depth from Figure B.1-1 d= 0.62 inches 2 Area tributary to BMP (s) A= 1.3 acres 3 Area weighted runoff factor (estimate using Appendix B.1.1 and C= 0.78 unitless B.2.1) 4 Trees Credit V olwne TCV= cubic-feet 5 Rain barrels Credit Volwne RCV= cubic-feet 6 Calculate DCV = (3630 x C x d x A) -TCV -RCV D CV= 2282 cubic-feet DMAC 1 85th percentile 24-hr storm depth from Figure B.1-1 d= 0.62 inches 2 Area tributary to BMP (s) A= 1.5 acres 3 Area weighted runoff factor (estimate using Appendix B.1.1 and C= 0.68 unitless B.2.1) 4 Trees Credit Volwne TCV= cubic-feet 5 Rain barrels Credit V olwne RCV= cubic-feet 6 Calculate DCV = (3630 x C x d x A) -TCV -RCV DCV= 2296 cubic-feet DMA D .. ! . • .. . .. ; 1 85th percentile 24-hr storm depth from Figure B.1-1 d= 0.62 inches 2 Area tributary to BMP (s) A= 1.15 acres 3 Area weighted runoff factor (estimate using Appendix B.1.1 and C= 0.78 unitless B.2.1) 4 Trees Credit Volwne TCV= cubic-feet 5 Rain barrels Credit Volwne RCV= cubic-feet 6 Calculate DCV = (3630 x C x d x A) -TCV -RCV DCV= 2019 cubic-feet DMAE 85thpercentile 24-hr storm depth from Figure B.1-1 d= 0.62 inches 2 Area tributary to BMP (s) A= 3.4 acres 3 Area weighted runoff factor (estimate using Appendix B.1.1 and C= 0.78 unitless B.2.1) 4 Trees Credit V olwne TCV= cubic-feet 5 Rain barrels Credit Volwne RCV= cubic-feet 6 Calculate DCV = (3630 x C x d x A) -TCV -RCV DCV= 5969 cubic-feet Runoff Factors DMAA s.f. (A) acres (C) Runoff CxA Roof 4904 0.113 0.9 0.10 Pvmt 12186 0.280 0.9 0.25 Hardscape 853 0.020 0.9 0.02 Landscape 7787 0.179 0.1 0.02 total 25730 0.591 0.39 Composite C 0.66 DMAB s.f. (A) acres (C) Runoff CxA Roof 18480 0.424 0.9 0.38 Pvmt 28739 0.660 0.9 0.59 Hardscape 1159 0.027 0.9 0.02 Landscape 8196 0.188 0.1 0.02 total 56574 1.299 1.02 Composite C 0.78 DMAC s.f. (A) acres (C) Runoff CxA Roof 16270 0.374 0.9 0.34 Pvmt 31708 0.728 0.9 0.66 Hardscape 235 0.005 0.9 0.00 Landscape 18589 0.427 0.1 0.04 total 66802 1.534 1.04 Composite C 0.68 DMAD s.f. (A) acres (C) Runoff CxA Roof 13639 0.313 0.9 0.28 Pvmt 26480 0.608 0.9 0.55 Hardscape 2608 0.060 0.9 0.05 Landscape 7513 0.172 0.1 0.02 total 50240 1.153 0.90 Composite C 0.78 DMAE s.f. (A) acres (C) Runoff CxA Roof 48565 1.115 0.9 1.00 Pvmt 72207 1.658 0.9 1.49 Hardscape 5345 0.123 0.9 0.11 Landscape 22709 0.521 0.1 0.05 total 148826 3.417 2.66 Composite C 0.78 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs DMAA ... "'!TIT i1 • .... ~""'~iTiTi-....... ,,.'"G . , .. ,,, __ :11 ..... ~-=-~ 1 Remaining DCV after implementing retention BMPs 876.00 cubic-feet Partial Retention 2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00 in/hr. 3 Allowable drawdown time for aggregate storage below the underdrain 36 hours 4 Depth of rnnoff that can be infiltrated [Line 2 x Line 3] 0 inches 5 Age:regate pore space 0.4 in/in 6 Required depth of gravel below the underdrain [Line 4/ Line 51 3 inches 7 Assumed surface area of the biofiltration Bi\fP 2,710.00 sq-ft 8 Media retained pore storage 0.1 in/in 9 Volume retained by Bi\fP [[Line 4 + (Line 12 x Line 8)]/12] x Line 7 406.50 cubic-feet 10 DCV that requires biofiltration (Line 1 -Line 9] 469.50 cubic-feet BMP Parameters 11 Surface Ponding [6 inch minimum, 12 inch maximum] 10.00 inches 12 Media Thickness [18 inches minimum], also add mulch layer thickness to this 18.00 inches line for sizing calculations 13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 18.00 inches inches for sizing if the aggregate is not over the entire bottom surface area 14 Freely drained pore storage 0.2 in/in 15 Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if the 0.16 in/hr. filtration rate is controlled by tl1e outlet use the outlet controlled rate which will be less than 5 in/hr.) Baseline Calculations 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm [ Line 15 x Line 16] 0.96 inches 18 Depth of Detention Storage 20.8 inches [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)] 19 Total Depth Treated (Line 17 + Line 18] 21.76 inches Ontion 1-Biofilter 1.5 times the DCV 20 Required biofiltered volume (1.5 x Line 10] 704.25 cubic-feet 21 Required Footprint [Line 20/ Line 19] x 12 388.37 sq-ft Option 2 -Store 0.75 of remaining DCV in pores and ponding 22 Required Storage (surface+ pores) Volume [0.75 x Line 10] 352.13 cubic-feet 23 Required Footprint [Line 22/ Line 18] x 12 203.15 sq-ft Footprint of the BMP 24 Area draining to the BlvIP 25,730.00 sq-ft 25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and 0.66 26 BMP Footprint Sizing Factor (Default 0.03 or an alternative) 0.03 27 Minimum B11P Footprint [Line 24 x Line 25 x Line 26] 509 sq-ft 28 Footprint of the B1-1P = Maximum(Minimum(Line 21, Line 23), Line 27) 509 sq-ft Check for Volume Reduction [Not applicable for No Infiltration Condition) (N/ A per form 1-8) 29 Calculate the fraction of DCV retained in the BMP [Line 9 /Line 1] 0.46 unitless 30 Minimum required fraction of DCV retained for partial infiltration 0.375 unitless 31 Is the retained DCV ~ 0.3 75? If the answer is no increase the footprint sizing 0 Yes □ No XN/A bn Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs DMA B 11111 .:_'W•~r-<u ro• ,.;,mn ,111, , •• ~ ... 1 Remaining DCV after implementing retention BMPs 2,282.00 cubic-feet Partial Retention 2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00 in/hr. 3 Allowable drawdown time for aggregate storage below the underdrain 36 hours 4 Depth of runoff that can be infiltrated [Line 2 x Line 3] 0 inches 5 Aggregate pore space 0.4 in/in 6 Required depth of gravel below the underdrain [Line 4/ Line 5] 3 inches 7 Assumed surface area of the biofiltration Bi\fP 7,100.00 sq-ft 8 Media retained pore storage 0.1 in/in 9 Volume retained by Bi\fP [[Line 4 + (Line 12 x Line 8)]/12] x Line 7 1,065.00 cubic-feet 10 DCV that requires biofiltration [Line 1 -Line 9] 1,217.00 cubic-feet BMP Parameters 11 Surface Ponding [6 inch minimum, 12 inch maximum] 10.00 inches 12 Media Thickness [18 inches minimum], also add mulch layer thickness to this 18.00 inches line for sizing calculations 13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 18.00 inches inches for sizing if the aggregate is not over the entire bottom surface area 14 Freely drained pore storage 0.2 in/in 15 Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if the 0.14 in/hr. filtration rate is controlled by the outlet use the outlet controlled rate which will be less than 5 in/hr.) Baseline Calculations 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm [ Line 15 x Line 16] 0.84 inches 18 Depth of Detention Storage 20.8 inches [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)1 19 Total Depth Treated [Line 17 + Line 18] 21.64 inches Ontion 1-Biofilter 1.5 times the DCV 20 Required biofiltered volume [1.5 x Line 10] 1,825.50 cubic-feet 21 Required Footprint [Line 20/ Line 19] x 12 1,012.29 sq-ft Option 2-Store 0.75 of remaining DCV in pores and ponding 22 Required Storage (surface + pores) Volume [0.75 x Line 10] 912.75 cubic-feet 23 Required Footprint [Line 22/ Line 18] x 12 526.59 sq-ft Footprint of the BMP 24 Area draining to the BMP 56,574.00 sq-ft 25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and 0.78 26 BMP Footprint Sizing Factor (Default 0.03 or an alternative) 0.03 27 Minimum Bi\fP Footprint [Line 24 x Line 25 x Line 26] 1,324 sq-ft 28 Footprint of the BMP = Maximum(Minimum(Line 21, Line 23), Line 27) 1,324 sq-ft Check for Volume Reduction [Not applicable for No Infiltration Condition) (N/ A per form 1-8) 29 Calculate the fraction of DCV retained in the BMP [Line 9 /Line 1] 0.47 unitless 30 Minimum required fraction of DCV retained for partial infiltration 0.375 unitless 31 Is the retained DCV ~ 0.375? If the answer is no increase the footprint sizing □ Yes □ No XN/A bn Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs DMAC ll!!!lill ,... •••~r.:niTiTi■r■r.11 ;Ui'ln ,..., , •• ,._ ... ~.,~ 1 Remaining DCV after implementing retention BMPs 2,296.00 cubic-feet Partial Retention 2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00 in/hr. 3 Allowable drawdown time for ae-e-regate storage below the underdrain 36 hours 4 Depth of runoff that can be infiltrated [Line 2 x Line 31 0 inches 5 Aggregate pore space 0.4 in/in 6 Required depth of gravel below the underdrain [Line 4/ Line 51 3 inches 7 Assumed surface area of the biofiltration BJ\:IP 7,240.00 sq-ft 8 Media retained pore storage 0.1 in/in 9 Volume retained by BJ\:IP [[Line 4 + (Line 12 x Line 8)]/12] x Line 7 1,086.00 cubic-feet 10 DCV that requires biofiltration (Line 1 -Line 9] 1,210.00 cubic-feet BMP Parameters 11 Surface Ponding [6 inch minimum, 12 inch maximuml 10.00 inches 12 Media Thickness [18 inches minimum], also add mulch layer thickness to this 18.00 inches line for sizing calculations 13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 18.00 inches inches for sizing if the aggregate is not over the entire bottom surface area 14 Freely drained pore storage 0.2 in/in 15 Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if the 0.16 in/hr. filtration rate is controlled by the outlet use the outlet controlled rate which will be less than 5 in /hr.) Baseline Calculations 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm [ Line 15 x Line 16] 0.96 inches 18 Depth of Detention Storage 20.8 inches [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)] 19 Total Depth Treated [Line 17 + Line 18] 21.76 inches Ontion 1-Biofilter 1.5 times the DCV 20 Required biofiltered volume [1.5 x Line 10] 1,815.00 cubic-feet 21 Required Footprint [Line 20/ Line 19] x 12 1,000.92 sq-ft Option 2 -Store 0.75 of remaining DCV in pores and ponding 22 Required Storage (surface+ pores) Volume [0.75 x Line 10] 907.50 cubic-feet 23 Required Footprint [Line 22/ Line 18] x 12 523.56 sq-ft Footprint of the BMP 24 Area draining to the BlvfP 66,802.00 sq-ft 25 Adjusted Runoff Factor for drainage area (Refer to Appencli",{ B.1 and 0.68 26 BMP Footprint Sizing Factor (Default 0.03 or an alternative) 0.03 27 Minimum Bi\:IP Footprint [Line 24 x Line 25 x Line 26] 1,363 sq-ft 28 Footprint of the BMP = Maximum(Minimum(Line 21, Line 23), Line 27) 1,363 sq-ft Check for Volume Reduction (Not applicable for No Infiltration Condition) (N/ A per form 1-8) 29 Calculate the fraction ofDCV retained in the BMP (Line 9/Line 1] 0.47 unitless 30 Minimum required fraction of DCV retained for partial infiltration 0.375 unitless 31 Is the retained DCV 2'. 0.375? If the answer is no increase the footprint sizing □ Yes □ No XN/A bn Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs DMAD ,-.11 11 ,,.. ''""''H"illiTIT i■i'iTlll i'll'iUI ,■~ ,■, 11• i11~, 1 Remaining DCV after 1mplementmg retention BMPs 2,019.00 cubic-feet Partial Retention 2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00 in/hr. 3 Allowable drawdown time for aggregate storage below the underdrain 36 hours 4 Depth of runoff that can be infiltrated fLine 2 x Line 31 0 inches 5 Aggregate pore space 0.4 in/in 6 Required depth of gravel below the underdrain fLine 4/ Line 51 3 inches 7 Assumed surface area of the biofiltration BMP 6,275.00 sq-ft 8 Media retained pore storage 0.1 in/in 9 Volume retained by BMP [[Line 4 + (Llne 12 x Line 8))/12) x Line 7 941.25 cubic-feet 10 DCV that requires biofiltration [Line 1 -Line 9] 1,077.75 cubic-feet BMP Parameters 11 Surface Ponding [6 inch minimum, 12 inch maximum] 10.00 inches 12 Media Thickness [18 inches minimum], also add mulch layer thickness to this 18.00 inches line for sizing calculations 13 Aggregate Storage above underdrain invert (12 inches typical) -use 0 18.00 inches inches for sizing if the aggregate is not over the entire bottom surface area 14 Freely drained pore storage 0.2 in/in 15 Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if tl1e 0.14 in/hr. filtration rate is controlled by the outlet use the outlet controlled rate which will be less than 5 in/hr.) Baseline Calculations 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm [ Line 15 x Line 16) 0.84 inches 18 Depth of Detention Storage 20.8 inches [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)] 19 Total Depth Treated [Line 17 + Line 18) 21.64 inches Ontion 1-Biofilter 1.5 times the DCV 20 Required biofiltered volume [1.5 x Line 10] 1,616.63 cubic-feet 21 Required Footprint [Line 20/ Line 19] x 12 896.46 sq-ft Option 2 -Store 0.75 of remaining DCV in pores and ponding 22 Required Storage (surface+ pores) Volume [0.75 x Line 10] 808.31 cubic-feet 23 Required Footprint [Line 22/ Line 18] x 12 466.33 sq-ft Footprint of the BMP 24 Area draining to the BlVIP 50,240.00 sq-ft 25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and 0.78 26 BMP Footprint Sizing Factor (Default 0.03 or an alternative) 0.03 27 Minin1um BMP Footprint [Line 24 x Line 25 x Line 26] 1,176 sq-ft 28 Footprint of the Bl\,fP = Maximum(Minimum(Line 21, Line 23), Line 27) 1,176 sq-ft Check for Volume Reduction [Not applicable for No Infiltration Condition) (N/ A per form 1-8) 29 Calculate the fraction ofDCV retained in the BMP [Line 9/Line 1] 0.47 unitless 30 Minin1um required fraction of DCV retained for partial infiltration 0.375 unitless 31 Is the retained DCV ~ 0.375? If the answer is no increase the footprint sizing □ Yes □ No XN/A bn Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs DMAE ~n_u_ ,r-•••i':11~1 • ·-JJI II■-.•• m~I '=•·--~ - 1 Remaining DCV after implementing retention BMPs 5,969.00 cubic-feet Partial Retention 2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible 0.00 in/hr. 3 Allowable drawdown time for aggregate storage below the underdrain 36 hours 4 Depth of runoff that can be infiltrated [Line 2 x Line 31 0 inches 5 Aggregate pore space 0.4 in/in 6 Required depth of gravel below the underdrain [Line 4/ Line 51 3 inches 7 Assumed surface area of the biofiltration Bi\1.P 18,530.00 sq-ft 8 Media retained pore storage 0.1 in/in 9 Volume retained by BMP [[Line 4 + (Line 12 x Line 8)]/12] x Line 7 2,779.50 cubic-feet 10 DCV that .requires biofiltration [Line 1 -Line 9] 3,189.50 cubic-feet BMP Parameters 11 Surface Ponding [6 inch minimum, 12 inch maximum] 10.00 inches 12 Media Thickness [18 inches minimum], also add mulch layer thickness to this 18.00 inches line for sizing calculations 13 Aggregate Storage above unde.rdrain invert (12 inches typical) -use 0 18.00 inches inches for sizing if the aggregate is not over the entire bottom surface area 14 Freely drained pore storage 0.2 in/in 15 Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if the 0.14 in/hr. filtration rate is controlled by the outlet use the outlet controlled rate which will be less than 5 in/hr.) Baseline Calculations 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm [ Line 15 x Line 16] 0.84 inches 18 Depth of Detention Storage 20.8 inches [Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)1 19 Total Depth Treated [Line 17 + Line 18] 21.64 inches Ontion 1 -Biofilter 1.5 times the DCV 20 Required biofiltered volume [1.5 x Line 10] 4,784.25 cubic-feet 21 Required Footprint [Line 20/ Line 19] x 12 2,653.00 sq-ft Option 2 -Store 0.75 of remaining DCV in pores and ponding 22 Required Storage (surface+ pores) Volume [0.75 x Line 10] 2,392.13 cubic-feet 23 Required Footprint [Line 22/ Line 18] x 12 1,380.07 sq-ft Footprint of the BMP 24 Area draining to the BMP 148,826.00 sq-ft 25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and 0.78 26 BMP Footprint Sizing Factor (Default 0.03 or an alternative) 0.03 27 Minimum m,1.P Footprint [Line 24 x Line 25 x Line 26] 3,483 sq-ft 28 Footprint of the BMP = Maximum(Minimum(Line 21, Line 23), Line 27) 3,483 sq-ft Check for Volume Reduction [Not applicable for No Infiltration Condition] (N/ A per form 1-8) 29 Calculate the fraction ofDCV retained in the BMP [Line 9/Line 1] 0.47 unitless 30 Minimum required fraction of DCV retained for partial infiltration 0.375 unitless 31 Is the retained DCV 2': 0.375? If the answer is no increase the footprint sizing □ Yes □ No XN/A bn 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 X Included Exhibit (Required) See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. Attachment 2b Management of Critical Coarse X 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 X Not performed Channels (Optional) □ Included See Section 6.3.4 of the BMP Design Manual. Attachment 2d Flow Control Facility Design and X Included Structural BMP Drawdown Calculations (Required) See Chapter 6 and Appendix G of the BMP DesiQn Manual ATTACHMENT 2 Use this checklist to ensure the required information has been included on the Hydromodification Management Exhibit: The Hydromodification Management Exhibit must identify: D Underlying hydrologic soil group D Approximate depth to groundwater □ Existing natural hydrologic features ( watercourses, seeps, springs, wetlands) □ Critical coarse sediment yield areas to be protected (if present) D Existing topography D Existing and proposed site drainage network and connections to drainage offsite □ Proposed grading D Proposed impervious features D Proposed design features and surface treatments used to minimize imperviousness D Point(s) of Compliance (POC) for Hydromodification Management D Existing and proposed drainage boundary and drainage area to each POC (when necessary, create separate exhibits for pre-development and post-project conditions) D Structural BMPs for hydromodification management (identify location, type of BMP, and size/detail) ' I u '" ~ ~ 8 ~ "' ~ g "8' o., ~ ~ 00 ti ~ 00 -0 a: -a; ol ~ ~ ,. CARIBOU COURT 7 40 0 4.03 ACRES 3 36" 355 ", _ __ --,) J.J.-_:, --7 ' \, __ ,,.,) ~ =-== =-= 350 ::::.- .35 35 345 40 39 39 385 38 375 37 360 3 ~ 4 345 345 340 ------------ PLANS PREPARED B~ SPEAR & ASSOCIATES, INC. CIVIL ENGINEERING & LAND SURVEYING 475 PRODUCTION STREET, SAN MARCOS, CA 92078 PHONE (760) 736-2040 FAX (760) 736-4866 WWW.SPEARING.NET --- 40 20 0 J 80 370 355 345 34 -----~----------- N 0 40 80 SCALE: 7" 40' I I ) 400 95 39 85 38 3 5 3 5 370 ~36-~ / I 120 345 -~ I / ® ·i' 5.46 ACRES ~ ) ~ AREAA ) TC LONGEST TRAVEL TIME L=590'LF \ \ cC PERMITTEE: HAMANN COMPANIES 1000 PIONEER WAY EL CAJON, CA 92020 ATTN. PAUL GIESE, RA (619) 440-7424 ASSESSOR'S PARCEL NO: 209-120-05 SITE ADDRESS WHIPTAIL LOOP, CARLSBAD, CA 360 ) I \ - ' I \ I \ ¥~,.,\ \ \\ \ ' \1 v \ "2,1 \ I \ ~___,. \ \ \ ·1\,\\ '\ i\ \ 1\ \\\\\\ \_11,,\ '"'I '',\,'\ \\-\ 1 1 Q/00=7. cfs _,,,_/ ~ ~" ' 2:1 SLOPELENJ' ~ INITIAL TC L -O' LP 1/ OWNER/DEVELOPER: CARLSBAD OAKS NORTH VENTURES, LP 3575 KENYON ST. SAN DIEGO, CA 92110 ATTN. TED TCHANG (619) 223-1663 LEGAL DESCRIPTION: LOT 6 OF CARLSBAD TRACT NO. 97-13-1, CARLSBAD OAKS NORTH, IN THE CITY OF CARLSBAD, COUNTY OF SAN DIEGO, STATE OF CALIFORNIA ACCORDING TO MAP THEREOF NO. 14926, FILED IN THE OFFICE OF THE COUNTY RECORDER OF SAN DIEGO COUNTY DECEMBER 15, 2004. 1/ --------- LEGEND 0~ SYMBOLS ( PROPERTY LIN[ ---STREET /:ENTERLINE EXISTING CONTOURS LONGEST FLDl,I PATH DRAINAGE AREA DRAINAGE MANAGEMENT AREA JJ[SIGNA TIDN WH/PTAIL LOOP PALOU4R i AIRPOR~ 't VICINITY MAP j NOT TO SCALE PRE-DEVELOPMENT DRAINAGE AREA MAP FOR: CARLSBAD OAKS NORTH LOT6 ~---------------~---------------------------------------------------------------------------------------------------------------------~ ----------------------------------- ~ E--< ~ BIOFILTRATION BASIN DATA TABLE BASIN I SIZE (SQ FT) ABOVE GRADE BELOW GRADE REQUIRED DEPTH {MIN) DEPTH (MIN) VOLUME {MIN) A 2,710 1.33' 3.00' 3,161 CF B 7,100 1.33' 3.00' 8,270 CF C 7,240 7.33' 3.00' 8,435 CF D 6,275 7.33' 3.00' 7,310 CF [ 78,530 7.33' 3.00' 27,579 CF ~78" ST1RM QR, 40 4 0 ORIFICE SIZE (in) 0.57" 0.84" 0.91" 0.79" 7.36" /4 / -· \ ' i \ I I \,\\ \ . cJ I E \ \ ,\ \ I \ SDP 2017-0003 LEGEND OF SYMBOLS ---( --- PROPERTY LINE STREET C£NT£RLIN£ EXISTING CONTOURS DIRECTION Of DRAINAG[ (fLOV PATH) LONG[ST fLOV PATH DRAINAGE MANAGEM[NT AREA BORD[R DRAINAGE MANAGEMENT AREA DESIGNATION PROPOS[D STDRM DRAIN & CATCH BASIN <PVT> INTERIOR WALL 36"x36" CATCH BASIN INSERT 6" 0/A. THREADED SLEEVE ANO SCREW ON PVC CAP @ CONNECTION {INTERIOR SIDE OF CATCH BASIN). 11-~-6" DIA. PERFORATED PVC UNDERDRAIN CONNECTION (FROM BASIN) OR/RC[ DRILLED THROUGH PVC CAP @ UNDERDRA/N CONNECTION. SEE OR/RC[ TABLE. MAINTENANCE PVC CAP DETAIL 40 ATTACH TO INTERIOR INLET WALL OF 36"x36" CATCH BASIN 20 0 STORM DRAIN STENCIL SD-13 N 40 80 SCALE: I ,, 40' 720 34 34 340 335 335-5 ~ ; / / :_ ====----=== 7) -----/ 330 ~J ->--~ ---_ "--'-~ ~ / 32 // -~-----~ ' / 2-3" HARDWOOD MULCH MAINTENANCE CLEAN-OUT CATCH BASIN EMERGENCY OVERFLOW STORM DRAIN STENCIL SD-/ 3 "" c::, -,,Oc' ~ cl (TO REMAIN CLOSED AT ALL TIMES) 6" MIN. FROM F.S. OF BASIN 3.00'{MIN.) BENCH I f---- WHEN NEXT TO A SLOPE ! . ',J ,,-'--'---" ----- AMENDED SOIL {K=5 IN/HR @ 40% POROSITY 1: 7 VERTICAL SLOPE -~": WASHED SAND OVER CHOKING STONE, ASTM NO. 8 IMPERVIOUS MEMBRANE (PER SOILS ENGINEER) MIN 24-MIL POLYETHYLENE LINER SiJCH AS WESTERN ENVIRONMENTAL LINERS AQUA 24 (OR EQUIVALENT) Wj,ILL SEAMS HEAT WELDED ~rrfoRM DRAIN SYS . 1:3 ~ ~ at: BASIN TOP (MIN.) BIOFIL TRA TION BASIN TYPICAL DETAIL & OUTLET CONNECTION NOT-TO-SCALE 6" P. C. C. CURB PER SDRSD G-7 7% MIN <,,, v- :0-kJ-o---DEPTH PER SOILS [NGIN[[R (SEE NOT[ HEREON) 7: 7 VERTICAL SLOPE FARADAY AVENUE BIOFILTRATION BASIN MEDIA AMEND[D SOIL LA YER COMPOSITION AND TEXTURE· 65% SAND, 20% SANDY LOAM, & 15% COMPOST (FROM VEGETATION-BASED FEEDSTOCK). ANIMAL WASTES OR BY-PRODUCTS SHOULD NOT BE APPLIED. AMENDED SOIL LA YER DEPTH P[R DETAIL P[RM[ABIUTY 5 IN/HR INFILTRATION RATE FOR THE FLOW-BASED SUSMP METHOD (1-6IN/HR FOR ALT[RNATIV[ DESIGNS, AS APPROVED BY LOCAL JURISDICTION). CHEMICAL COMPOSITION: TOTAL PHOSPHORUS < 75 PARTS PER MILLION (PPM); PH 6-8; CATION EXCHANGE CAPACITY> 5 MILL/EQUIVALENTS PER 100 GRAMS (M[Q/100 G) OF SOIL; ORGANIC MATTER CONTENT < 5 PERCENT BY WEIGHT. DRAINAGE LA YER SEPARATE SOIL MEDIA FROM UNDERDRA/N LAYER WITH 2 TO 4 INCHES OF WASHED SAND, FOLLOWED BY 2 INCHES OF CHOKiNG STONE (ASTM NO. 8) OVER A 7.0-FOOT ENVELOP[ OF ASTM NO. 57 STONE TOTAL COMBINED DRAINAGE LAYER DEPTH PER DETAIL SURFACE VEGETATION AS SPECIFIED BY THE LANDSCAPE ARCHITECT PLANS. DRAINAGE AREA SURFACE SYMBOL BUILDING ROOFTOP /---./~ '< /"',<" Y'...../1 PARKING/DRIVE AISLE I .. --. I IMPERVIOUS AREA >·.,:".-:·· __ _.-.. ,-~<-.: HARSCAPING/SIDEWALK I ',. -: ' . : I LANDSCAPING AREA I· :-:-:-:-1 INDIVIDUAL TOTAL OMA AREA SOIL TYPE TYPED TYPED TYPED TYPED DRAINAGE AREA DMA BREAKDOWN ORA/NAG[ ARD! ~ ' DRAINAGE AREA 'B' ORA/NAG[ ARD! 'C' ORA/NAG[ ARD! 'O' DRAINAGE ARD! '[/' 4,904 SQ FT 78,480 SQ FT 16,270 SQ FT 13,639 SQ FT 15,411 SQ FT 12,786 SQ FT 28,739 SQ FT 31,708 SQ FT 26,480 SQ FT 13,966 SQ FT 853 SQ FT 1,759 SQ FT 235 SQ FT 2,608 SQ FT 393 SQ FT 7,787 SQ FT 8,196 SQ FT 18,589 SQ FT 7,513 SQ FT 492 SQ FT 25,730 SQ FT 56,574 SQ FT 66,802 SQ FT 50,240 SQ FT 30,262 SQ FT DRAINAGE ARD! '[2' DRAINAGE ARD! "SM-1" 33,154 SQ FT 0 SQ FT 58,241 SQ FT 0 SQ FT 4,952 SQ FT 0 SQ FT 22,217 SQ FT 26,958 SQ FT 118,564 SQ FT 26,958 SQ FT ASSESSOR'S PARCEL NO: 209::-120,-05 SITE ADDRESS WHIPTAIL LOOP, CARLSBAD, CA DRAINAGE AREA "SM-2" DRAINAGE ARD! "SM-3" O SQ FT 0 SQ FT 0 SQ FT 0 SQ FT 0 SQ FT 0 SQ FT 38,399 SQ FT 89,592 SQ FT 38,399 SQ FT 89,592 SQ FT TOTAL LOT AREA = 503,127 SQ FT >--+----+---------------+--l------tlsHE1ETI. _c_rr_Y_o_F_c_A_R_1_s_B_A_D~lsHE1ETsl _ ENGINEERING DEPARTMENT I DATE INITIAL DATE INITIAL ENGINEER OF WORK REVISION DESCRIPTION OTHER APPROVAL DATE INITIAL CITY APPROVAL DMA & HYDROMODIFICATION EXHIBIT FOR LOT 6 CARLSBAD OAKS NORTH RECORD COPY PROJECT NO. DRAWING NO. INITIAL DATE '-------------------------------------------------------------------------------------------------~--------------------------------------------------------------------~ --------------- Self Mitigating Areas: SM1 26,958 s.f. Landscaping SM2 38,399 s.f. landscaping SM3 89,592 s.f. landscaping ", ,~ ,, . t • .; . . '> t "' 't: ! , ,t ., . , :i, . l ' \ - f • I" ' ) . ~ "; i i I: . • '" · r & . . :; _ \,1 . l ~j . ; ' { f ; " : j j ' ~ ; l , ' I' I ' . i · i~ • s• r : " • • , "' - ; . , f- . . . . t » i t . ~· ,._ . ~ ,. ~. '•I J• • '~ i .- · ~ ~, , , · .. . . ,. -C ' ~ .~ tj 'l e ;( , , . ~ .. _ . t . "- ~ . , .., I ~ ,,, , ,;i . J ~ · • • BMP Sizing Spreadsheet V2.0 Project Name: Carlsbad Oaks North Lot 6 Project Applicant: Carlsbad Oaks North Ventures, LP Jurisdiction: City of Carlsbad Parcel (APN): 209-120-05 Hydrologic Unit: Carlsbad Rain Gauge: Oceanside Total Project Area (sf): 503,121 Channel Susceptibility: High BMP Sizi"I Spreadsheet V2.0 Project Name: Carlsbad Oaks North Lot 6 Hydrologic Unit: Carlsbad Project Applicant: Cartsbad Oaks North Ventures, lP Rain Gauee: Oceanside Jurisdictk,n: City of Carlsbad Total Project ArH: 503,121 Parcel (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name: Basin A BMPType: Biofiltration w/ Impermeable Uner BMP Native Soil Type: 0 BMP Infiltration Rate (in/hr): 0.024 ArHs Orainina: to BMP HMP Sizirc Fatten Minimum BMP Size OMA Post Project Runoff Factor Surface Volume Subsurface Volume N,rne Aru{sf) Soil Type Pre•project Slope Surface Type (T,ble G.2-1)1 Surface Area Surface Volume Subsurface Volume Surface Are• {sf) (cf) (cf) A 4,904 0 fie! Roof 0.9 0.16 0.1333 0.096 706 588 424 A 12,186 0 flat Pvmt 0.9 0.16 0.1333 0.096 1755 1462 1053 A 853 D Flet Hardsape 0.9 0.16 0.1333 0.096 123 102 74 A 7,787 D Flet Londsape 0.1 0.16 0.1333 0.096 125 104 75 Total BMP Area 25,730 Minimum BMP Size 2708.384 2256 1625 Proposed BMP Size• 2710 2258 1626 Soil Matrix Depth 18.00 in Minimum Pondinc Depth 9.99 In Maximum Ponding Depth 15.99 In sei.cted Pondinc Depth 10.00 In ~ ----- 1. Runoff factors which are used for hydromodifkatlon manaeement flow control (Table G.2•1) are different from the runoff factors used for pollutant control BMP sizing (Table B.1·1). Table references are taken from the San Diego Region Model BMP Design Manu Describe the BMP's in sufficient detail in your PDP SWQMP to demonstrate the o1rea, volume, and other criteri1 t1n be met within the constr1lnts of the site. BMP's must be ado1pted and o1pplied to the conditions specific to the devtlopment project such as unst1ble slopes or the lack. of 1vailable head. Designated Staff have fino1I review and ,1pprovail aiuthority over the project desi1n. This BMP Sizinc Spre..dsheet has been updated in conformance with the San Otego A.11ion Model BMP Design Mainuail, Febn,1ry 2016. For questions or conctms please contact the jurisdiction in which your project is loc1ted. BMP Sizing Spreadsheet V2.0 Project Name: arlsbad Oaks North Lot Hydrologic Unit: Carlsbad Project Applicant: bad Oaks North Venturi Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 503,121 Parcel (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name Basin A BMP Type: Biofiltration w/ Impermeable Liner OMA Rain Gauge Pre-developed Condition 0., Sizing Factor OMA Area (ac) Orifice Flow -%Q, Orifice Area Name Soil Type Cover Slope (cfs/ac) (cfs) (in2) A Oceanside 0 Scrub Flat 0.175 0.113 0.002 0.05 A Oceanside 0 Scrub Flat 0.175 0.280 0.005 0.12 A Oceanside 0 Scrub Flat 0.175 0.020 0.000 0.01 A Oceanside D Scrub Flat 0.175 0.179 0.003 0.08 Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub 0.010 0.25 0.57 Tot. Allowable Tot. Allowable Max Orifice Orifice Flow Orifice Area Diameter (cfs) (in2) (in) 0.010 0.26 0.57 Actual Orifice Flow Actual Orifice Area Selected Orifice Diameter (cfs) (in2) (in) Drawdown (Hrs) 60.0 BMP Sizing Spreadsheet V2.0 Project Name: Carlsbad Oaks North lot 6 Hydroloeic Unit: Carlsbad Project Applic.int: Cilrlsbad Oaks North Ventures, LP Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 503,121 Parcel (APN): 209-120-05 low Flow Threshold: 0.1Q2 BMP Name: Silsin B BMPType: Biofilt~tion w/ Impermeable liner BMP Native Soil Type: D BMP Infiltration fbte (in/hr): 0.024 Areas Draining to BMP HMP Sizine Factors Minimum BMP Size OMA Post Project Runoff Factor Surface Volume Subsurface Volume Name Area (sf) Soil Type Pre•project Slope Surface Type (Table G.2-1)' Surface Area Surface Volume Subsurface Volume Surface Area {sf) (cf) (cf) B 1B,480 D Flat Roof 0.9 0.16 0.1333 0.096 2661 2217 1597 B 2B,739 D Flat Pvmt 0.9 0.16 0.1333 0.096 4138 3448 2483 B 1,159 D Flat HardSCilpe 0.9 0.16 0.1333 0.096 167 139 100 B 8,196 D Flat Landscape 0.1 0.16 0.1333 0.096 131 109 79 Total BMP Area 56,574 Minimum BMP Size 7097.568 5913 4259 Proposed BMP Size• 7100 5917 4260 Soil Matrix Depth 18.00 in Minimum Ponding Depth 9.99 in Maximum Ponding Depth 13.26 in Selected Ponding Depth 10.00 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 Manu Describe the BM P'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, February 2016. For questions or concerns please contact the jurisdiction in which your project is Jocated. BMP Sizing Spreadsheet V2.0 Project Name: arlsbad Oaks North Lot Hydrologic Unit: Carlsbad Project Applicant: bad Oaks North Ventur Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 503,121 Parcel (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name Basin B BMP Type: Biofiltration w/ Impermeable Liner OMA Rain Gauge Pre-developed Condition Oz Sizing Factor OMA Area (ac) Orifice Flow -%Oz Orifice Area Name Soil Type Cover Slope (cfs/ac) (cfs) (in2) B Oceanside D Scrub Flat 0.175 0.424 0.007 0.18 B Oceanside D Scrub Flat 0.175 0.660 0.012 0.28 B Oceanside D Scrub Flat 0.175 0.027 0.000 0.01 B Oceanside D Scrub Flat 0.175 0.188 0.003 0.08 Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub 0.023 0.55 0.84 Tot. Allowable Tot. Allowable Max Orifice Orifice Flow Orifice Area Diameter (cfs) (in2) (in) 0.023 0.55 0.84 Actual Orifice Flow Actual Orifice Area Selected Orifice Diameter (cfs) (in2) (in) Drawdown (Hrs) 72.4 BMP Sizing Spreadsheet V2.0 Project Name: C.rlsbad Oaks North Lot 6 Hydrolocic Unit: C.rlsbad Project Applicant: Carlsbad Oaks North Ventures, LP Rain Gauge: OcHnside Jurisdicdon: City of C.rlsbad Total Project Are.a: 503,121 Parcel (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name: 8.uinC BMPType: 8iofiltnUon w/ Impermeable Uner BMP N•tive Soil Type: 0 BMP Infiltration Rate (;,,/hf): 0.024 Are11 Drainina to BMP HMP Sizinc Factors Minimum BMP Size OMA Post Project Runoff Factor Surface Volume Subsurface Volume Name Ar•• (sf) 5o11Type PN!-project Slope Surface Type (Table G.2·1)1 Surface Area Surface Volume Subsurface Volume Surface Area (sf) (cf) (cf) C 16,270 0 Flat Roof 0.9 0.16 0.1333 0.096 2343 1952 1406 C 31,708 0 Flat Pvmt 0.9 0.16 0.1333 0.096 4566 3804 2740 C 235 0 Flat Hardsc.ape 0.9 0.16 0.1333 0.096 34 28 20 C 18,589 0 Flat Landscape 0.1 0.16 0.1333 0.096 297 248 178 Total BMP ArH 66,802 Minimum BMP Size 7240.096 6032 4344 Proposed BMP Size• 7240 6033 4344 Soll Matrix Depth 18.00 in Minimum Ponding Depth 10.00 in Maximum Ponding Depth 15.26 in Selected Pondinc Depth 10.00 in Notes: 1. Runoff factor$whic:h ue used for hydromodiftc.ation manacem■nt flow control (Table G.2-1) ue different from the runoff factors used for pollutant control BMP sizing (Table B.1-1). Table references are taken from the San Oieeo Res:ion Model BMP Oes•n Manu Describe the BM P'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. BM P's must be adapted and applied to the conditions specific to the development project such as unstilble slopes or the l,1ck. of ,1v•ilable head. Designated Staff have final review and approval authority over the project deslcn. This BMP Sizing SprHdsheet has been updated in conformance with the ~n Diego Re1ion Model BMP Oes.i1n Manual, February 2016. For questM)ns or concerns please contact the jurisdiction in which your project is louted. BMP Sizing Spreadsheet V2.0 Project Name: arlsbad Oaks North Lot Hydrologic Unit: Carlsbad Project Applicant: bad Oaks North Venturi Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 503,121 Parcel (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name Basin C BMPType: Biofiltration w/ Impermeable Liner OMA Rain Gauge Pre-developed Condition Q, Sizing Factor OMA Area (ac) Orifice Flow • %Q, Orifice Area Name Soil Type Cover Slope (ds/ac) (ds) (in2) C Oceanside D Scrub Flat 0.175 0.374 0.007 0.16 C Oceanside D Scrub Flat 0.175 0.728 0.013 0.31 C Oceanside D Scrub Flat 0.175 0.005 0.000 0.00 C Oceanside D Scrub Flat 0.175 0.427 0.007 0.18 Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub 0.027 0.66 0.91 Tot. Allowable Tot. Allowable Max Orifice Orifice Flow Orifice Area Diameter (ds) (in2) (in) 0.027 0.65 0.91 Actual Orifice Flow Actual Orifice Area Selected Orifice Diameter (ds) (in2) (in) Drawdown !Hrs) 62.9 BMP Sizing Spreadsheet V2.0 Proj@ct Name: Clrtsbad Oaks North Lot 6 Hvdrolocic Unit: C.rlsbad Project Applicant: Clr1sbad Oaks North Ventures, LP b in Gauge: Oceanskle Jurisdiction: City of C.rtsbad Total Project Area: 503,Ul P•rc•I (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name: Basin D BMP Type: Biofiltriition w/ Impermeable Uner BMP N•tlll< Soil Type: 0 BMP tnfittration Rate (in/hr): 0.024 ArHS Draining to BMP HMP Sizine Factors Minimum BMP Size OMA Post Project Runoff Factor Surface Volume Subsurface Volume N•me ArH(sf) Soil Type Pro-projoct Slope Surface Type (Table G.2-1)1 Surface Area Surface Volume Subsurface Volume Surface Aru (sf) (cf) (cf) 0 13 639 0 Flot Roof 0.9 0.16 0.1333 0.096 1964 1636 1178 0 26480 0 Flot Pvmt 0.9 0,16 0.1333 0.096 3813 31n 2288 0 2,608 0 Flot Hardsupe 0.9 0.16 0.1333 0.096 376 313 22S 0 7,513 0 Flot l..>ndS<llOO 0.1 0.16 0.1333 0.096 120 100 72 Total BMP Area 50,240 Minimum BMP Size 6272.896 5226 3764 Proposed BMP Size• 6275 5229 3765 Soll Matrix Depth 18.00 in Minimum Ponding Depth 9.99 in Maximum Ponding Depth 13.27 in Selected Pondinc Depth 10.00 in Notes: 1. Runoff factors which are used for hydromodifiation ma~pment flow control (Table G.2-1) are different from the runoff factors used for pollutant control BMP sizinc (Table 8.1-1}. Table refl!!Nnces are taken from the San Oieeo Reeion Model BMP Design Manu Describe the BMP's In suffident detail in your PDP SWQMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site. BM P'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 Sizinc Spreadsheet has been updated in conform.nee with the San 0ieco Reeion Model BMP Design Manual, February 2016. For questions or concerns pluse contact the jurisdiction in which your project is Socated. BMP Sizing Spreadsheet V2.0 Project Name: arlsbad Oaks North Lot Hydrologic Unit: Carlsbad Project Applicant: bad Oaks North Ventur Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 503,121 Parcel (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name Basin O BMP Type: Biofiltration w/ Impermeable Liner OMA Rain Gauge Pre-developed Condition ~ Sizing Factor OMA Area (ac) Orifice Flow -~ Orifice Area Name Soil Type Cover Slope (ds/ac) (ds) (in2) 0 Oceanside 0 Scrub Flat 0.175 0.313 0.005 0.13 0 Oceanside 0 Scrub Flat 0.175 0.608 0.011 0.26 D Oceanside 0 Scrub Flat 0.175 0.060 0.001 0.03 D Oceanside D Scrub Flat 0.175 0.172 0.003 0.07 Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub 0.020 0.49 0.79 Tot. Allowable Tot. Allowable Max Orifice Orifice Flow Orifice Area Diameter (cfs) (in2) (in) 0.020 0.49 0.79 Actual Orifice Flow Actual Orifice Area Selected Orifice Diameter (ds) (in2) (in) Drawdown (Hrs) 72.4 BMP Sizine Spreadsheet V2.0 Project Name: Carlsbad Oaks North Lot 6 Hydrok>eic Unit: Carlsbad Project Appliaint: Carlsbad Oaks North Ventures, LP Rain Gauce: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 503,121 Parcel (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name: Baisin E BMPType: BtOfiltration w/ Impermeable Uner BMP Native Soil Type: D BMP lnfittration Rate (iin/hr): 0.024 Areas Orainina to BMP HMP Sizinc Factors Minimum BMP Size OMA Post Project Runoff Factor Surface Volume Subsurface Volume Name Area(sf) Soil Type Pre-project Slope Surface Type (Table G.2-1)1 Surface Area Surface Volume Subsurface Volume Surface Area (sf) (cf) (cf) E 48,565 D Flat Roof 0.9 0.16 0.1333 0.096 6993 5826 4196 E 72 207 D Flat Pvmt 0.9 0.16 0.1333 0.096 10398 8663 6239 E S,345 D Flat Hardscaoe 0.9 0.16 0.1333 0.096 770 641 462 E 2l,709 D Flat Landscaoe 0.1 0.16 0.1333 0.096 363 303 218 Total BMP Area 148,826 Minimum BMP Size 18524.192 15433 11115 Proposed BMP Size• 1BS30 15442 11118 Soll Matrix Depth 18.00 in Minimum Ponding Depth 9.99 in Maximum Pondina: Depth 13.31 in Selected Pondinl Depth 10.00 in ~ 1. Runoff factors which are used for hydromodifation manaeement flow control (TableG.2-1) ,,. different from the n.inoff factors used for pollutant control BMP sizing (Table 8.1-1}. Table references are taken from the San Oieeo Recion Model BMP Oesic;n Manu 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. BM P's must be adapted and applied to the conditions specific to the development project such as unmble slopes or the lack of available head. Oesi1nated Staff have final review and approval authority over the project design. This BMP Sizinc Spreadsheet has been updated in conformance with the San 05eeo Recion Model BMP Oesian M1nual, February 2016. For questK>ns or concerns please contact the jurisdiction in which your projttt is kxated. BMP Sizing Spreadsheet V2.0 Project Name: arlsbad Oaks North Lot Hydrologic Unit: Carlsbad Project Applicant: bad Oaks North Ventun Rain Gauge: Oceanside Jurisdiction: City of Carlsbad Total Project Area: 503,121 Parcel (APN): 209-120-05 Low Flow Threshold: 0.1Q2 BMP Name Basin E BMP Type: Biofiltration w/ Impermeable Liner OMA Rain Gauge Pre-developed Condition O, Sizing Factor OMA Area (ac) Orifice Flow -%0, Orifice Area Name Soll Type Cover Slope (cfs/ac) (cfs) (in2) E Oceanside D Scrub Flat 0.175 1.115 0.020 0.48 E Oceanside D Scrub Flat 0.175 1.658 0.029 0.71 E Oceanside D Scrub Flat 0.175 0.123 0.002 0.05 E Oceanside D Scrub Flat 0.175 0.521 0.009 0.22 Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub Scrub 0.060 1.46 1.36 Tot. Allowable Tot. Allowable Max Orifice Orifice Flow Orifice Area Diameter (cfs) (in2) (in) 0.059 1.45 1.36 Actual Orifice Flow Actual Orifice Area Selected Orifice Diameter (cfs) (in2) (in) Drawdown (Hrs) 72.1 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: X 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: □ 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 D 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) D Manufacturer and part number for proprietary parts of structural BMP(s) when applicable D 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.) D 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 ( OPERATION & MAINTENANCE (O&M) PLAN 1. Contents 1. PROJECT DESCRIPTION .................................................................................................. 1 2. OPERATION & MAINTENANCE (O&M) PLAN ........................................................... 1 3. Operation & Maintenance of BMP'S .................................................................................. 1 A. Training .............................................................................................................. 2 B. Landscaping ....................................................................................................... 2 C. Irrigation System ................................................................................................ 5 D. Roof Drains ........................................................................................................ 5 E. Trash Storage Areas .......................................................................................... 5 F. Storm Water Conveyance System Stenciling and Signing ................................. 5 G. Structural BMP: Biofiltration .............................................................................. 7 H. Outlet Structures ................................................................................................ 8 I. Vector Control Owner Responsibilities .................................................................. 8 1 ATTACHMENTS _,,, Al. Inspection & Maintenance Schedule Bl. Cost Estimate Cl. BMP Training Log D1. Inspection & Maintenance Log -i- ( C 1. PROJECT DESCRIPTION Proposed land use is commercial development with a parking lot and associated underground utilities, landscaping, and biofiltration for stormwater treatment . 2. OPERATION & MAINTENANCE (O&M) PLAN This document has been prepared in compliance with the San Diego Regional Water Quality Control Board requirements and in accordance with requirements set by the City. A Storm Water Quality Management Plan (SWQMP) has been prepared for the project. It identifies the specific Best Management Practices (BMPs) required for the project. Refer to this project's SWQMP for additional information on BMPs. Proper maintenance of the project BMP's is required for their intended and effective function. This O&M Plan provides operation and maintenance procedures for the BMPs designated in the SWQMP. It includes procedures to be followed for inspection and maintenance of the BMPs, instructions for documenting the work performed, record keeping, and outlining the requirement and procedures for training of personnel involved in the process. 3. Operation & Maintenance of BMP'S It shall be the responsibility of the "Owner or Designated Responsible Party" to maintain and to train all employees for the maintenance and operation of all BMPs, to achieve the maximum pollutant reduction they are designed for, as addressed in the approved Project's SWQMP. The following schedule of O&M' s must be followed to satisfy the Conditions of Concern and the Pollutants of Concern as addressed in the approved Project's SWQMP. This schedule shall include periodic inspections of all Source Control and Treatment Control BMP's. All maintenance records for training, inspection and maintenance shall be retained and provided to the city upon request. The owner may also be required to provide to the City, as part of the maintenance and operation agreement an executed access easement that shall be binding on the land throughout the life of the project. Responsible Party for O&M and For Training Carlsbad Oaks North Ventures, LP Attn. Ted Tchang 3575 Kenyon St. San Diego, CA 92110 (619) 223-1663 The Designated Responsible Party will be responsible for ensuring that individuals involved in O&M activities, including but not limited to contractors and new owners, will be trained according to the training program herein, Additionally, upon any future sale of the property, the Owner will be responsible for ensuring that the new Designated Responsible Party is familiar with the contents of the plan and the requirements for the routine inspection, routine and non-routine maintenance and 1 record keeping tasks as described herein. All parties involved in the O&M activities will be required to read this plan. A. Training Personnel training is an important component of the implementation of this O&M Plan. The employee training program may consist of a meeting with any new owners, Designated Responsible Party or contractor/employees involved in the O&M activities to review the contents of this plan and to physically tour the facility to observe the BMPs and describe O&M requirements for each BMP. The Designated Responsible Party will implement the training program. All new contractors involved in landscape and/or facility maintenance at the site shall receive training within 30-days of hire and shall receive updated annual training. Maintenance contractor shall verify staff training annually. The Designated Responsible Party shall be responsible for documenting all training activities and for maintaining records related to training. Forms for documentation of training are included in Attachment C 1 of this plan. Training records must be shall be retained and provided to the city upon request. B. Landscaping Operational and maintenance needs include: • Vegetation management to maintain adequate drainage and to limit habitat for mosquitoes, rodents and other disease-carrying vectors. """'\ • Parking lot sweeping. -✓ • Animal and vector control (any method to limit or eradicate the mammals, birds, insects or other arthropods which transmit disease pathogens). • Periodic sediment removal to optimize performance. • Trash, debris, grass trimmings, tree pruning, and leaf collection and removal to prevent obstruction of landscape areas so as not to prohibit their use as a BMP. • Monitoring irrigation equipment. • Removal of standing water, which may contribute to the development of aquatic plant communities or mosquito breeding areas. • Preventive maintenance on sampling, flow measurement, and associated BMP equipment and structures. • Erosion and structural maintenance to prevent the loss of soil and maintain the performance of all landscaping. Inspection Frequency The facility will be inspected and inspection visits will be completely documented: • Once a month at a minimum. • After every large storm (after every storm monitored or these storms with more than 0.50 inch of precipitation.) • On a weekly basis during extended periods of wet weather. 2 r Inspect for proper irrigation and fertilizer use, and ensure that all landscaped areas have minimum of 80% coverage. Visual Inspection as part of landscape maintenance • Inspect before and after the rainy season (Rainy season (Oct. 1 to April 30)). Aesthetic Maintenance The following activities will be included in the aesthetic maintenance program: Grass Trimming: Trimming of grass will be done on all landscaped areas, around fences, at the inlet and outlet structures, and sampling structures. Weed Control. Weeds will be removed through mechanical means. Herbicide shall not be used because these chemicals will impact the water quality monitoring. Functional Maintenance Functional maintenance has two components: • Preventive maintenance • Corrective maintenance Preventive Maintenance Preventive maintenance activities to be instituted for landscaped areas are: • • • • • • Grass Mowing: Vegetation seed, mix within the landscaped areas, are to be designed to be kept short to maintain adequate drainage and to limit the development of faunal habitats. Prohibitive dumping placards . Trash and Debris: During each inspection and maintenance visit to the site, debris and trash removal will be conducted to reduce the potential for inlet and outlet structures and other components from becoming clogged and inoperable during storm events. Sediment Removal: Sediment accumulation, as part of the operation and maintenance program at of landscaped areas, will be monitored once a month during the dry season, after every large storm (0.50 inch), and monthly during the wet season. Specifically, if sediment reaches a level at or near plant height, or could interfere with flow or operation, the sediment will be removed. If accumulation of debris or sediment is determined to be the cause of decline in design performance, prompt action (i.e., within ten working days) will be taken to restore the landscaped areas to design performance standards. Actions will include using additional fill and vegetation and/or removing accumulated sediment to correct channeling or ponding. Characterization and Appropriate disposal of sediment will comply with applicable local, county, state, or federal requirements. The landscaped areas will be re-graded, if the flow gradient has changed, and then replanted with sod. Removal of Standing Water: Standing water must be removed if it contributes to the development of aquatic plant communities or mosquito breeding areas. Fertilization and Irrigation: The vegetation seed mix is to been designed so that fertilization and irrigation is to be kept at a minimum. 3 • Elimination of Mosquito Breeding Habitats. The most effective mosquito control program is one that eliminates potential breeding habitats. Corrective Maintenance Corrective maintenance is required on an emergency or non-routine basis to correct problems and to restore the intended operation and safe function of all landscaped areas. Corrective maintenance activities include: Removal of Debris and Sediment: Sediment, debris, and trash, which impede the hydraulic functioning of landscaping and prevent vegetative growth, will be removed and properly disposed. Temporary arrangements will be made for handling the sediments until a permanent arrangement is made. Vegetation will be re-established after sediment removal. Structural Repairs: Once deemed necessary, repairs to structural components of landscaping will be done within 10 working days. Qualified individuals (i.e., the designers or contractors) will conduct repairs where structural damage has occurred. Embankment and Slope Repairs: Once deemed necessary, damage to the embankments and slopes of landscaped areas will be repaired as soon as possible, and within 10 working days maximum. Erosion Repair: Where a reseeding program has been ineffective, or where other factors have created erosive conditions (i.e., pedestrian traffic, concentrated flow, etc.), corrective steps will be taken to prevent loss of soil and any subsequent danger to the performance and use of landscaped areas as BMPs. There are a number of corrective actions than can be taken. These include erosion control blankets, riprap, sodding, or reduced flow through the area. Designers or contractors will be consulted to address erosion problems if the solution is not evident. Elimination of Animal Burrows Animal burrows will be filled and steps taken to remove the animals if burrowing problems continue to occur (filling and compacting). If the problem persists, vector control specialists will be consulted regarding removal steps. This consulting is necessary as the threat of rabies in some areas may necessitate the animals being destroyed rather than relocated. If the BMP performance is affected, abatement will begin. Otherwise, abatement will be performed annually in September. General Facility Maintenance: In addition to the above elements of corrective maintenance, general corrective maintenance will address the overall facility and its associated components. If corrective maintenance is being done to one component, other components will be inspected to see if maintenance is needed. Maintenance Frequency The Inspection & Maintenance Schedule included in enclosed Attachment Al for all BMPs lists the schedule of maintenance activities to be implemented. Debris and Sediment Disposal Waste generated onsite is ultimately the responsibility of the Owner. Disposal of sediments, debris, and trash will comply with applicable local, county, state, and federal waste control programs. Hazardous Waste 4 Suspected hazardous wastes will be analyzed to determine disposal options. Hazardous wastes generated onsite will be handled and disposed of according to applicable local, state, and federal regulations. A solid or liquid waste is considered a hazardous waste if it exceeds the criteria listed in the CCR, Title 22, Article 11. C. Irrigation System Inspection Frequency and Procedure The Irrigation system shall be checked each week as a minimum. The following items shall be checked to insure that they are functioning properly: • Shut-off devices • Pressure drop sensors • Moisture sensors • All piping and sprinkler heads to insure there are no leaks and that proper water spread is maintained. • All flow reducers. • Check for overspray/runoff D. Roof Drains All roof drains shall be inspected Prior to August 31 of each year to ensure that they are clean and free from trash and in good repair. They shall be flushed and any leaks or damages piping shall be either replaced or repaired. Where roof drains flow onto grass areas splash structures and or rock rip-rap shall be maintained so the flow from the roof drains do not cause erosion or damage to the grass area. During the rain season roof drains shall be inspected weekly and after each rain storm to insure that there is no trash and or silt build up that will restrict the run-off flow from the roof. All trash and/or silt build up shall be removed immediately. • It is not permissible to directly connect roof drains into a drain system. • Roof drain downspouts shall discharge runoff to a landscaped area, and to allow the runoff to flow through landscape, prior to entering a private yard drain system. E. Trash Storage Areas All trash storage areas shall be inspected daily to insure that they are clean from trash. Also the following shall be inspected annually before and after the rainy season (Oct. 1 to April 30). • Pavement is in good repair. • Drainage will not run-off onto adjacent areas. • That they remain screened or walled to prevent off-site transport of trash. • That all lids are closed and/or awnings are in good repair to minimize direct precipitation. F. Storm Water Conveyance System Stenciling and Signing 5 • Signage/stenciling are to be inspected for legibility and visual obstruction and shall be repaired J and cleared of any obstruction within 5 working day of inspection. · • Inspection Frequency: Semi-annually, and monthly during rainy season. 6 G. Structural BMP: Biofiltration Vegetated Infiltration or Filtration BMP Maintenance Indicators and Actions for Vegetated BMPs Typical Maintenance lndicator(s) Maintenance Actions for Vegetated BMPs Accumulation of sediment, litter, or Remove and properly dispose of accumulated materials, without debris damage to the vegetation. Poor vegetation establishment Re-seed, re-plant, or re-establish vegetation per original plans. Overgrown vegetation Mow or trim as appropriate, but not less than the design height of the vegetation per original plans when applicable ( e.g. a vegetated swale may require a minimum vegetation height). Erosion due to concentrated irrigation Repair/ re-seed/ re-plant eroded areas and adjust the irrigation flow system. Erosion due to concentrated storm Repair/ re-seed/ re-plant eroded areas, and make appropriate water runoff flow corrective measures such as adding erosion control blankets, adding stone at flow entry points, or minor re-grading to restore proper drainage according to the original plan. If the issue is not corrected by restoring the BMP to the original plan and grade, The City must be contacted prior to any additional repairs or reconstruction. Standing water in vegetated swales Make appropriate corrective measures such as adjusting irrigation system, removing obstructions of debris or invasive vegetation, loosening or replacing top soil to allow for better infiltration, or minor re-grading for proper drainage. If the issue is not corrected by restoring the BMP to the original plan and grade, CiIT~ must be contacted pnor to any additional repairs or reconstruction. Standing water 10 bioreten tion, Make appropriate corrective measures such as adjusting irrigation biofiltration with partial retention, or system, removing obstructions of debris or invasive vegetation, biofiltration areas, or flow-through clearing underdrains (where applicable), or repairing/ replacing planter boxes for longer than 96 hours clogged or compacted soils. following a storm event" Obstructed inlet or outlet structure Clear obstructions. Damage to structural components such Repair or replace as applicable. as weirs, inlet or outlet structures "These BMPs typically include a surface ponding layer as part of their function which may take 96 hours to drain following a storm event. 7 Inspection Frequency The facility will be inspected and inspection visits will be completely documented: • Once a month at a minimum. • After every large storm (after every storm monitored or these storms with more than 0.50 inch of precipitation.) • On a weekly basis during extended periods of wet weather. Maintenance is needed if vegetation height is greater than 5" (height shall be kept between 2" and 5"); if there is standing water; if debris are present or if sedimentation is occurring at the vegetation height; ensure that all landscaped areas have minimum of 80% coverage and that no animal burrows are present. Visual Inspection as part of landscape maintenance • Inspect before and after the rainy season (Rainy season (Oct. 1 to April 30)). H. Outlet Structures All outlet structures shall be kept functional at all times. Routine inspection and corrective maintenance shall include removal of trash sediment and debris and repair of any structural damage or clogging of orifice outlets. The minimum maintenance frequency shall be Prior to August 31 each year, weekly during rainy season or within 24 hours prior to rain forecasts. I. Vector Control Owner Responsibilities VECTOR MANAGEMET CONTROL REQUIREMENTS Any method to limit or eradicate the mammals, birds, insects or other arthropods which transmit disease pathogens. Management of mosquitoes and other vectors in stormwater management structures, such as Bioretention Facilities and Best Management Practices, is critical for protecting public health. In order to implement vector controls including minimizing the risk for mosquito-borne disease transmission, It is the responsibility of the Owner to regularly maintain the outlet structures and monitor the site after every storm event to ensure that the system ( comprising of above and below ground storage facilities) is dewatered in less than 72 hours. Otherwise the owner will be required to implement a vector control plan in accordance with California Department of Public Health. • Maintain all drainage inlets and outlets trash free; remove silt; make sure to clear any standing water after 72-hours of ponding. Vector Control Resources: 1. F of San Diego vector educational brochures please reference the following website: http://www.sdcounty.ca.gov/deh/pests/vector disease.html 2. Please contact the County of San Diego vector control program with specific questions or concerns. 8 C ATTACHMENT "Al" INSPECTION & MAINTENANCE SCHEDULE PREVENTATIVE MAINTENANCE AND ROUTINE INSPECTION TYPE BMP Routine Action Maintenance Maintenance MAINTENANCE Indicator Frequency ACTIVITY Landscaping & Proper irrigation Less than 80% Each year as Re-plant. Repair irrigation & Fertilizer. coverage needed and once Irrigation system during rainy season within 5-days. (Oct. 1 to April 30) Trash storage Trash free and Visual Daily inspection Remove trash and areas removal of silt Inspection silt Daily. Roof drain Trash free and Silt build up of Each year routinely Remove all trash removal of silt, more than 1" no as needed. and silt and repair sedimentation & trash any damage to Debris roof drains, Bioretention -Trash free and Silt build up of Monthly during rainy Remove trash and Biofiltration removal of silt. more than 2" no season,and silt -repair and Facilities Clear Clogged trash, after Storm Event reseed exposed outlets and Exposed soils, areas, maintain Standing Water. dead grass height so as vegetation, not be shorter ponded water, than 2" or higher and excessive than 5" remove all vegetation ponded water (see TC-30) weekly inspections, (See TC-30) Storm Water Must be legible Fading of paint Semi-annually each Repaint stenciling Conveyance at all times and or illegible year & monthly and/or replace system have a clear letters or during rainy season signs Stenciling & view. Sianina Outlet Must be kept Silt, debris, Weekly during rainy Silt, debris, trash Structures functional at all trash season or within 24 accumulation and times. Clear accumulation, hours prior to rain repair any Clogged outlets Ponding Water forecasts. structural damage and Standing to the outlet Water. structures. 9 SITE-SPECIFIC REQUIREMENTS All slopes and landscaped areas are to have a minimum coverage of 80% All trash storage areas to be free from trash and silt at all times All Roof to be free from trash and silt and in good repair All bio-filters to be free from trash and silt at all times, grass area to be free from exposed soil and maintained to proper height, removal of any ponding of water for more than 72 hours. Appies to all stenciling and signs All outlet structures shall be kept functional at all times. ATTACHMENT "81" Annual Estimate to Maintain all BMPs Annual 10-Year Landscaping & Biofiltration Maintenance of landscaping and bio-filters is already included in the property management responsibilities. Additional cost: $400 $4,000 Irrigation System: Inspection and maintenance of the irrigation system is already included in the property management responsibilities, Additional cost: $100 $1,000 Roof Drains: Roof drain inspection and maintenance is already included in the property management responsibilities. Training: Once a year & training of new employees within their first week of employment. $100 $1,000 Stormdrain Signage (As needed or every 2 years) $100 $1,000 .~ Trash Storage Areas: Inspection of trash storage area & maintenance to those areas is already included in the property management responsibilities. Additional cost: $SO $500 Total Estimated Annual Cost to Maintain BMPs $750 $7,500 10 ( ATTACHMENT "C1" BMP TRAINING LOG Personnel Date Type of Training Trained Trainer MO/Dav/Yr C 11 J ATTACHMENT "D1" INSPECTION AND MAINTENANCE LOG Name of Date Repair made and BMPTYP& DATE Person Description of BMP Condition/ Description repair Description repair required if made and by LOCATION M/D/Y Inspecting any whom .A 12 C C C ATTACHMENT 3 ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit [Use the City's standard Single Sheet BMP Plan.] = ~ -G -I f ;," ~ ~ ~ ~ -~ -°' . . \ \ \ I I ' -------~~~F~~ \ I,, \ I 40 CARIBOU COURT 3 9c 395 00 -------39 C 0 39 385 38 80 38 38 375 375 5 370 37 365 3 ~ 360 - ( ( ' 0 4~03 ACRES ) / ' / I ) J \"'"--__ / ® 5:.46ACRES ~ ) ~ --------- ) ) - I/ ~ I / AREA A "'"a TC LONGEST TRAVEL TIME 7 ~ L=590'LF ( (j ,," 2:1 SLOPE LEN~ INITIAL TC L -O' LF --- 36 36v 3 355 -=--= 3 5Q_____..---------- 35 35 --------345 4 34 4 333 3 33 330 325 ------- --------- 7 - 7 -\ \ ! / , ( \ ~ I \ 350 355 ,· ~ 3 345 3,;.o 34 335 335 -" O-, --------(-/-:-_,---\-~7 --\--,/ i:;ARADAY AVENUE / L_ ___ / -// N ___. 345 AREASM-3 TC LONGEST TRAVEL TIME L=l 160' LF ' --- PERMITTEE: HAMANN COMPANIES 1000 PIONEER WAY EL CAJON, CA 92020 ATTN. PAUL GIESE, RA (619) 440-7424 OWNER/DEVELOPER: CARLSBAD OAKS NORTH VENTURES, LP 3575 KENYON ST. SAN DIEGO, CA 92110 ATTN. TED TCHANG (619) 223-1663 PLANS PREPARED BY: ASSESSOR'S PARCEL NO: LEGAL DESCRIPTION: SPEAR & ASSOCIATES, INC. 209-120-05 LOT 6 OF CARLSBAD TRACT NO. 97-13-1, CARLSBAD I \ \ ' I I LEGEND Or SYMBOLS PR[JP[RTY LIN[ STR[[T C[NT[RLIN[ [XISTING C[JN![JURS L[JNG[ST FL[JI/ PA TH DRAINAG[ AR[A DRAINAG[ MANAG[M[NT AR[A D[SIGNA TWN WH!PTAIL LOOP j PALOMAR A/RPO~ ~ VICINl1Y MAP U NOT TO SCALE CIVIL ENGINEERING & LAND SURVEYING OAKS NORTH, IN THE CITY OF CARLSBAD, COUNTY OF SAN 475 PRODUCTION STREET, SAN MARCOS, CA 92078 40 20 O 40 80 120 SITE ADDRESS DIEGO, STATE OF CALIFORNIA ACCORDING TO MAP THEREOF PRE-DEVELOPMENT DRAINAGE AREA MAP FOR: PHONE (760) 736-2040 FAX (760) 736-4866 WHIPTAIL LOOP, CARLSBAD, CA NO. 14926, FILED IN THE OFFICE OF THE COUNTY CARLSBAD OAKS NORTH ~ WWW.SPEARINC.NET RECORDER OF SAN DIEGO COUNTY DECEMBER 15, 2004. ::; ~~-c<~•~ , SCALE: 1 " = 40' LOT 6 ~L____: _____ ~---==~="">2:::_::::::=::~_:;:.-;_ _______________________________________________________________________________________________ ___.'.:================================:=J ]3 .3 0 CATCH BASIN EMERGENCY OVERFLOW STORM DRAIN STENCIL SD-I 3 3. 00 '(MIN.) BENCH I WHEN NEXT TO A SLOPE '.(/~----- !c::, Cc: cl [8 CJ "it --BASIN TOP (MIN,) 3 32 2-3" HARDWOOD MULCH MAINTENANCE CLEAN-OUT (TO REMAIN CLOSED AT ALL TIMES) 6" MIN. FROM F.S. OF BASIN 6" P.C.C. CURB PER SDRSD G-1 1% MIN. 401., 395 330 ------ BIOFILTRATION BASIN MEDIA AMENDED SOIL LA YER COMPOSITION AND TEXTURE: BASIN I A B C D E 09 65% SAND, 20% SANDY LOAM, & 15% COMPOST (FROM VEGETATION-BASED FEEDSTOCK). ANIMAL WASTES OR BY-PRODUCTS SHOULD NOT BE APPLIED. AMENDED SOIL LAYER DEPTH PER DETAIL. BIOFIL TRATION BASIN DATA TABLE SIZE (SQ FT) ABOVE GRADE BELOW GRADE REQUIRED ORIFICE DEPTH (MIN) DEPTH (MIN) VOLUME (MIN) SIZE (in) 2,770 7.JJ' 3.00' J, 161 CF 0.57' 7, JOO 7.JJ' 3.00' 8,270 CF 0.84" 7,240 7.33' 300' 8,435 CF 0.97" 6,275 7.33' 3.00' 7,310 CF 0.79" 78,530 7.33' 3.00' 27,579 CF 1.36" 4 400 .o95 3 DRAINAGE AREA SURFACE SYMBOL SOIL TYPE BUILDING ROOFTOP :Y::::-'V½ ,-e...__1½ ;:.../: TYPED PARKING/DRIVE AISLE i \ I TYPED IMPERVIOUS AREA .-'"/ ~--.-..:·. ..... HARSCAPING/SIDEWALK I :a. · ':! TYPED LANDSCAPING AREA ,~•V•"~~.•: I . . . . I TYPED INDIVIDUAL TOTAL DMA AREA DRAINAGE AREA ~' 4,904 SQ FT 12,186 SQ FT 853 SQ FT 7,787 SQ FT 25,730 SQ FT /4 / ~ \ \ \ I _..------,==1c,g3~ ti~t~ \ \ \ . \ \ \ \ \ DRAINAGE AREA OMA BREAKDOWN DRAINAGE AREA 'B' DRAINAGE AREA 'c' DRAINAGE AREA 'D' DRAINAGE AREA 'El' DRAINAGE AREA 'E2' 78,480 SQ FT 76,270 SQ FT 73,639 SQ FT 75,471 SQ FT 33,154 SQ FT 28,739 SQ FT 31,708 SQ FT 26,480 SQ FT 73,966 SQ FT 58,241 SQ FT I, 759 SQ FT 235 SQ FT 2,608 SQ FT 393 SQ FT 4,952 SQ FT 8,196 SQ FT 18,589 SQ FT 7,573 SQ FT 492 SQ FT 22,217 SQ FT 56,574 SQ FT 66,802 SQ FT 50,240 SQ FT 30,262 SQ FT 118,564 SQ FT SOP 2017-0003 LEGEND OF SYMBOLS PROPERTY LINE STREET CENTERLINE EXISTING CONTOURS ------DIRECTION OF DRAINAGE (FLOW PATH) LONGEST FLOW PATH ( DRAINAGE MANAGEMENT AREA BORDER DRAINAGE MANAGEMENT AREA DESIGNATION PROPOSED STORM DRAIN & CATCH BASIN <PVT> INTERIOR WALL 36''x36" CATCH BASIN INSERT 6" DIA. THREADED SLEEVE AND SCREW ON PVC CAP@ CONNECTION ( /1/' ~ (INTERIOR SIDE OF CATCH BASIN). '1~-,----6" DIA. PERFORATED PVC UNDERDRAIN CONNECTION (FROM BASIN) ORIFICE DRILLED THROUGH PVC CAP @ UNDERDRAIN CONNECTION. SEE ORIFICE TABLE. MAINTENANCE PVC CAP DETAIL 40 DRAINAGE AREA "SM-/" 0 SQ FT 0 SQ FT 0 SQ FT 26,958 SQ FT 26,958 SQ FT ATTACH TO INTERIOR INLET WALL OF 36"x36" CATCH BASIN 20 0 STORM DRAIN STENCIL SD-13 N 40 80 SCALE: 1 " 40' 120 ASSESSOR'S PARCEL NO: 209-120-05 . SITE ADDRESS WHIPTAIL LOOP, CARLSBAD, CA DRAINAGE AREA "SM-2' DRAINAGE AREA "SM-3" 0 SQ FT 0 SQ FT 0 SQ FT 0 SQ FT 0 SQ FT 0 SQ FT 38,399 SQ FT 89,592 SQ FT 38,399 SQ FT 89,592 SQ FT TOTAL LOT AREA = 503,121 SQ FT >---+--f--------------+----+----+----+---lsHE1nl. _c_rT_Y __ o_F_c_A_R_L_s_B_A_D~lsHE1nsl _ ENGINEERING DEPARTMENT DMA & HYDROMODIFICATION EXHIBIT FOR: LOT 6 CARLSBAD OAKS NORTH RECORD COPY PROJECT NO. DRAWING NO. =------= ::---:.=_- ~ BMPID# \ ~0,~' ,,\/~~~ ~ ,.\~ BMPTYPE ~ \ •, SYMBOL D CASQA NO. BMP QUANTITY HYDROMODIFICATION & TREATMENT CONTROL ©-® BIORETENTION k·•·••••••·l TC-32 5 AREA LOW IMPACT DESIGN (L.I.D.) 0-@ ROOF DRAIN TO 1001 SD-11 22 LANDSCAPING SOURCE CONTROL @-@ TRASH 121251 SD-32 6 ENCLOSURE 40 FARADAY AVENUE TABLE DRAWING NO. SHEET NO.(S) INSPECTION * MAINTENANCE* FREQUENCY FREQUENCY . . * * . . ANNUALLY ANNUALLY . . ANNUALLY ANNUALLY 40 20 395 39 38 380 0 40 N i I 40 80 SDP 2017-0003 BIOFILTRATION BASIN DATA TABLE BASIN I SIZE (SQ FT) ABOVE GRADE BELOW GRADE REQUIRED ORIFICE DEPTH (MIN) DEPTH (MIN) VOLUME (MIN} SIZE (in} SWQMP NO. ____ _ A B C D E 720 39 39 38 2,770 7.33' 3.00' 3,767 CF 7,700 1.33' 3.00' 8,270 CF 7,240 1.33' 3.00' 8,435 CF 6,275 1.33' 3.00' 7,310 CF 18,530 1.33' 3.00' 21,579 CF ---~ 400 0 305 '90 ,s- :-;<·;J ·-'' ' . ., 37.0. INTERIOR WALL 36"x35" CATCH BASIN INSERT 6" DIA. THREADED SLEEVE AND SCREW ON PVC CAP @ CONNECTION {INTERIOR SIDE OF CATCH BASIN). --+-6" DIA. PERFORATED PVC UNDERDRAIN CONNECTION (FROM BASIN) ORIFICE DRILLED THROUGH PVC CAP @ UNDERDRAIN CONNECTION. SEE ORIFICE TABLE. MAINTENANCE PVC CAP DETAIL ATTACH TO INTERIOR INLET WALL OF 36"x36" CATCH BASIN 0.57" 0.84" 0.91" 0.79" 1.36" AMENDED SOIL LA YER COMPOSITION AND TEXTURE: 65% SAND, 20% SANDY LOAM, & 75% COMPOST (FROM VEGETATION-BASED FEEDSTOCK). ANIMAL WASTES OR BY-PRODUCTS SHOULD NOT BE APPLIED. AMENDED SOIL LAYER DEPTH PER DITAIL. PERMEABILITY: 5 IN/HR INFILTRATION RATE FOR THE FLOW-BASED SUSMP METHOD (l-6IN/HR FOR ALTERNATIVE DESIGNS, AS APPROVED BY LOCAL JURISDICTION). CHEMICAL COMPOSITION: TOTAL PHOSPHORUS < 15 PARTS PER MILLION (PPM); PH 6-8; CATION EXCHANGE CAPACITY> 5 MILL/EQUIVALENTS PER 100 GRAMS (MEQ/700 G} OF SOIL; ORGANIC MATTER CONTENT < 5 PERCENT BY W£/GHT DRAINAGE LA YER SEPARATE SOIL MEDIA FROM UNDER DRAIN LA YER WITH 2 TO 4 INCHES OF WASHED SAND, FOLLOWED BY 2 INCHES OF CHOKING STONE (ASTM NO. 8} OVER A 1.0-FOOT ENVELOPE OF ASTM NO. 57 STONE. TOTAL COMBINED DRAINAGE LAYER DEPTH PER DITAIL. SURFACE VEGITAT!ON AS SPECIFIED BY THE LANDSCAPE ARCHITECT PLANS. CATCH BASIN EMERGENCY OVERFLOW STORM DRAIN STENCIL SD-7 3 AMENDED SOIL (K=5 IN/HR} @ 40% POROSITY 1.· 1 VERTICAL SLOPE ~-.11 ;, , " WASHED SAND OVER CHOKING STONE, ASTM NO. 8 IMPERVIOUS MEMBRANE (PER SOILS ENGINEER) MIN 24-MIL POLYETHYLENE LINER SUCH AS WESTERN ENVIRONMENTAL LINERS AQUA 24 (OR '2- EOUIVALENT) W/4LL SEAMS HEAT WELDED 2? PARTY RESPONSIBLE FOR MAINTENANCE: NAME CARLSBAD OAKS NORTH VENTURES, LP ADDRESS 3575 KENYON STREET CONTACT TED TCHANG SAN DIEGO CA 92110 --'-'="----'-"==-- PHONE NO. (619) 223-1663 PLAN PREPARED BY: NAME JOSHUA R. ZEIGLER COMPANY SPEAR & ASSOC/A TES, INC. ADDRESS 4 75 PRODUCTION STREET SIGNATURE SAN MARCOS, CA 92078 PHONE NO. --'-('-'76--.-0'-'-)-'7'-"3""6_-=-20"-4'-"0'---- BMP NOTES: CERTIFICATION _____ _ 1. THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S RECOMMENDATIONS OR THESE PLANS. 2. NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 3. NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPES WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. \ STORM DRAIN STENCIL SD-13 ASSESSOR'S PARCEL NO: 209-120-05 SITE ADDRESS WH1PTAIL LOOP, CARLSBAD, CA 2-3" HARDWOOD MULCH MAINTENANCE CLEAN-OUT (TO REMAIN CLOSED AT ALL TIMES} 6" MIN. FROM F.S. OF BASIN 6" P.C.C. CURB PER SDRSD G-I 1% MIN. ts SOIL SURFACE ~ -: 0.35' ~ ~ GRAVEL TOP ::,s i'!l <::)~ c:, en Iv) ~ ~rJ-----l_GRAVEL BOTTOM "' ASTM NO. 57 STONE LAYER @ 40% POROSITY ~• ...-a,;;;=-::;:t~I?:'2 ~ouTFAlll TU TO o sT,uO,R,.M,. ~ $:/,f.)f '»'>?' DRAIN SYSTEM '%;t~ ~'>' 6" DIA. PERFORATED PVC UNDERDRAIN INSERT 6" DIA. THREADED SLEEVE & PVC CAP @ CONNECTION (INTERIOR SIDE OF CATCH BASIN}. Sff ORIFICE TABLE FOR SIZING. BIOFIL TRA TION BASIN TYPICAL DETAIL & OUTLET CONNECTION NOT-TO-SCALE 9iaf ESS 104: 0 R '1( 1$1 "",.J · 1<0 ~ ( V) Q/ Y' ---' 2>-:, ::;O :z:: I w No. 85413 ~ l---+--t--------------1----1----1-----1----1 I SHElET I CITY OF CARLSBAD I SHElETS I ~===-'===E::N=GI:=N=:E:=E'::R=IN=G=D'::E:::P=A'::R:=T::M=EN:=T=:==::::...::::='::=~ Io< '<O * * J' "' '4;: C/V\\. ,f:' f' Or CAI. l'<:i SINGLE SHEET B~!P SITE PLAN LOT 6 CARLSBAD OAKS NORTH PLANS PREPARED B~ RECORD COPY PROJECT NO. ®-® NO DUMPING STENCILS DRAINS TO SD-13 8 . . AS NEEDED AS NEEDED WATERWAYS =, SPEAR & ASSOCIATES, INC- "'~~"" I CIVIL ENGINEERING & LAND SURVEYING -,~1 475 PRODUCTION STREET, SAN MARCOS, CA 92078 !'i ~ u PHONE (760) 736-2040 FAX (760) 736-4866 ;,; SCALE: 7" 40' -,_,1 . , WWW.SPEARING.NET ~ *30 !JAYS PRIDR TD DCTDBER 1ST EACH YEAR & IIEEKL Y IJURING RAIN SEASON, I 111 I(; ~ ~ 1 DRAWING NO. DATE INITIAL DATE INITIAL DATE INITIAL ENGINEER OF WORK REVIS1ON DESCRIPTION CITY APPROVAL INITIAL DATE ~ !~ ~~~ ~' '-'-~ L--------------------------------------=--....:::::__--=--.::___~----------===========================~========================:::::.l OTHER APPROVAL