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Home My WebLink AboutAMEND 2018-0007; ENCINA WATER POLLUTION CONTROL FACILITY; STORM WATER QUALITY MANAGEMENT PLAN; 2018-11-30,,. .. ... .. - 11111 - .. "" .. 1111 ... 1111 .. .. --.. .. ... .. .. .. ---.. - CITY OF CARLSBAD PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) AND DRAINAGE STUDY FOR Encina Water Pollution Control Facility Primary Treatment Area improvements AMEND 2018-0007 AMEND2018-0008 ENGINEER OF WORK: Kathleen Higgins, PE No. 43323 PREPARED FOR: Encina Wastewater Authority 6200 Avenida Encinas Carlsbad, CA 92011 760-438-3941 PREPARED BY: Woodard & Curran, Inc. 10509 Vista Sorrento Parkway, Suite 205 San Diego, CA, 92121 858-875-7 400 DATE: November 30, 2018 ------------• --- 1111 -1111 ----------------- TABLE OF CONTENTS Certification Page ............................................................................................................................. 1 Project Vicinity Map .......................................................................................................................... 2 FORM E-34 Storm Water Standard Questionnaire ........................................................................... 3 Site Information ................................................................................................................................. 7 FORM E-36 Standard Project Requirement Checklist.. ................................................................... 16 Summary of PDP Structural BMPs .................................................................................................. 20 Attachment 1: Backup for PDP Pollutant Control BMPs ................................................................. 23 Attachment 1 a: OMA Exhibit.. .............................................................................................. 24 Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations ...... 25 Attachment 1 c: Harvest and Use Feasibility Screening (when applicable) ........................... 26 Attachment 1d: Categorization of Infiltration Feasibility Condition (when applicable) .......... 27 Attachment 1e: Pollutant Control BMP Design Worksheets/ Calculations ........................... 31 Attachment 2: Backup for PDP Hydromodification Control Measures ............................................. 33 Attachment 2a: Hydromodification Management Exhibits .................................................... 35 Attachment 2b: WMAA Critical Coarse Sediment Yield Area Map ....................................... 37 Attachment 3: Structural BMP Maintenance Thresholds and Actions .............................................. 38 Attachment 4: Single Sheet BMP (SSBMP) and Drainage Exhibit.. ................................................. 39 Attachment 5: Drainage Calculations .............................................................................................. 40 ----- -----------------------------.. CERTIFICATION PAGE Project Name: Encina Water Pollution Control Facility Primary Treatment Area mprovements Project ID: [Insert] 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. 43323 3/31/20 Engineer of Work's Signature, PE Number & Expiration Date Kathleen Higgins Print Name Woodard & Curran, Inc. Company November 30, 2018 Date 1 City of Carlsbad STORM WATER STANDARDS QUESTIONNAIRE Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov E-34 I 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' requirements or be subject to 'PRIORITY DEVELOPMENT PROJECT' (PDP) requirements. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you, this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the city. If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff. A completed and signed questionnaire must be submitted with each development project application. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. PROJECT INFORMATION PROJECT NAME: Encina Water Pollution Control Facility Primary Treatment PROJECT ID: AMEND 2018-0007 Area Improvements AMEND 2018-0008 ADDRESS: 6200 Avenida Encinas, Carlsbad, CA 92011 APN: 211-03-008; 2 11-03-006; 214-01- 095 The project is (check one): D New Development ✓ Redevelopment The total proposed disturbed area is: 15246 ft2 ( 0.35 ) acres The total proposed newly created and/or replaced impervious area is: 13504 ft2 ( 0.31 ) 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. 3 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 guidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in □ ✓ 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, go to Step 3. 4 STEP3 ...:,;,,;..... TO BE COMPLETED FOR ALI. NEW.~R~ , .,. ~-, ,.,·. . ,' To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1 )): YES NO 1. Is your project a new development that creates 10,000 square feet or more of impervious surfaces □ ✓ collectively over the entire project site? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. 2. Is your project a redevelopment project creating and/or replacing 5,000 square feet or more of impervious surface collectively over the entire project site on an existing site of 10,000 square feet or more of ✓ □ impervious surface? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. 3. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a restaurant? A restaurant is a □ ✓ facility that sells prepared foods and drinks for consumption, including stationary lunch counters and 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 □ ✓ development project includes development on any natural slope that is twenty-five percent or Qreater. 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 transportation of automobiles, trucks, motorcycles, 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 project to the ESA (i.e. not commingled with flows from adjacent lands.* 8. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface that supports an automotive repair shop? An automotive repair 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 per day. 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 10%? (CMC 21 .203.040) If you answered "yes" to one or more of the above questions, your project is a PDP. If your project is a redevelopment project, go to step 4. If your project is a new project, go to step 5, check the first box stating, "My project is a PDP ... " and complete applicant information. If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the second box stating, "My project is a 'STANDARD PROJECT' ... " and complete applicant information. 5 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) = 873,378 sq . ft. ✓ □ Total proposed newly created or replaced impervious area (8) =· 13,504sq. ft. Percent impervious area created or replaced (8/A)*100 = 1.55 % 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. J 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. J 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: Kathleen Higgins Applicant Title: Senior Technical Practice Leader Applicant Signature: Date: August 3, 2018 • 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 City Use Only YES NO City Concurrence: □ □ By: Date: Project ID: 6 SITE INFORMATION CHECKLIST Project Summary Information Project Name Encina Water Pollution Control Facility Primary Treatment Area lmorovements Project ID Project Address 6200 Avenida Encinas Carlsbad, CA 92011 Assessor's Parcel Number(s) (APN(s)) 211-03-008; 211-03-006; 214-01-095 Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area 25.59 Acres (1.1147x106 Square Feet) Existing Impervious Area (subset of Parcel Area) 20.05 Acres (873,378 Square Feet) Area to be disturbed by the project (Proiect Areal 0.31 Acres (13,503 Square Feet) Project Proposed Impervious Area ( subset of Project" Area) 0.28 Acres (12,196 Square Feet) 0.17 Acres from pervious to impervious Project Proposed Pervious Area (subset of Project Area) 0.03 Acres (1,307 Square Feet) Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the Project. This may be less than the Parcel Area. 7 Description of Existing Site Condition and Drainage Patterns Current Status of the Site (select all that apply): ✓ Existing development J Previously graded but not built out J Agricultural or other non-impervious use Jvacant, undeveloped/natural Description/ Additional Information: Site is an operating wastewater reclamation facility. Existing Land Cover Includes (select all that apply): ✓ Vegetative Cover· · J Non-Vegetated Pervious Areas ✓ Impervious Areas Description / Additional Information: Site includes roads, buildings and treatment facilities with some landscaped areas. Underlying Soil belongs to Hydrologic Soil Group (select all that apply): J NRCS Type A J NRCS Type B J NRCS Type C ✓ NRCS Type D Approximate Depth to Groundwater (GW): J GW Depth < 5 feet J 5 feet < GW Depth < 1 0 feet ✓ 10 feet < GW Depth < 20 feet ✓ GW Depth > 20 feet Existing Natural Hydrologic Features (select all that apply): J Watercourses J Seeps J Springs J Wetlands ✓ None Description / Additional Information: 8 Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from the site? At a minimum, th is description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]: (1) Existing drainage conveyance is urban. (2) The Encina Water Pollution Control Facility stormwater conveyance and collection system is made up of concrete V ditches and storm drains. The V ditches range from shallow ditches adjacent to roadways to two-foot triangular ditches. The majority of stormwater within the treatment facility is collected and transferred to the treatment systems at several points within the system rather than dumping that stormwater directly into Encinas Creek. A portion of the runoff from the roads within the site is conveyed to CDS units prior to discharge to Encinas Creek (3) Runoff from offsite areas are conveyed in ditches around the site to Encinas Creek. 9 Description of Proposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: This project involves the conversion of a pervious area to a parking lot. Also, a 0.19 acre (8,276 sq. ft.) area including grit and screen buildings will receive a combination of excavation and paving. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): A 0:13 acre (5,663 sq . ft.) area will be converted from pervious cover to an impervious parking lot. An additional 0.05 acre (2,178 sq. ft.) area will be converted from pervious cover to impervious pavement. List/describe proposed pervious features of the project (e.g ., landscape areas): The proposed parking lot will include 0.03 Acres (1,307 Square Feet) that will remain pervious. The upper 6 inches of soil will be scarified and recompacted to 90% relative density. A filter fabric will be installed below¾ inch crushed rock and a minimum 6 inch rock layer will be provided. The northeast end of the parking lot will also include an area consisting of a 3 ft. wide landscape. Does the project include grading and changes to site topography? ✓Yes J No Description / Additional Information: The proposed parking lot will have a minimum 2% slope and will be paved at an elevation ranging from 0.5 ft . to 6.2 ft . above the existing ground surface. Does the project include changes to site drainage (e .g., installation of new storm water conveyance systems)? ✓Yes J No Description / Additional Information: The minimum 2% slope of the parking lot will cause runoff to flow from the northeast end of the parking lot to the southwest end. A curb and concrete gutter will be put in place along the southwest end of the parking lot. A 3-inch perforated drain pipe will be located below the existing ground surface of the parking lot. Where existing roads, sidewalks, and drainage concrete swales are removed for construction, the grade and slope will be adjusted to match existing grade and slope. 10 Identify whether any of the following features, activities, and/or pollutant source areas will be present (select all that apply): ✓ On-site storm drain inlets J Interior floor drains and elevator shaft sump pumps J Interior parking garages . J Need for future indoor & structural pest control ✓ Landscape/Outdoor Pesticide Use J Pools, spas, ponds, decorative fountains, and other water features J Food service J Refuse areas J Industrial processes J Outdoor storage of equipment or materials J Vehicle and Equipment Cleaning J Vehicle/Equipment Repair and Maintenance J Fuel Dispensing Areas J Loading Docks J Fire Sprinkler Test Water J Miscellaneous Drain or Wash Water ✓ Plazas, sidewalks, and parking lots 11 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): Runoff will flow from the northeast end of the parking lot to the southwest end and into a curb and concrete gutter. Water will then flow along valley ditches throughout the facility and transported to two drainage areas where it can either be pumped into the plant's headworks or released to the flood control channel (Encinas Creek). Encinas Creek then discharges to the Pacific Ocean, which is located roughly 1,000 ft. from the property's boundary. 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 . . None Listed 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 B.6): Also a Receiving Not Applicable to Anticipated from the Water Pollutant of Pollutant the Project Site Project Site Concern Sediment X Nutrients X Heavy Metals X OrQanic Compounds X Trash & Debris X Oxygen Demanding X Substances Oil & Grease X Bacteria & Viruses X Pesticides X 12 Hydromodification Management Requirements Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)? ✓Yes, hydromodification management flow control structural BMPs required. J 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. J 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. J 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): Hydromodification management applies. However, the change in flow is minimal and the flow is pumped back to the treatment systems. Critical Coarse Sediment Yield Areas* *This Section only required if hydromodification management requirements apply Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas exist within the project drainage boundaries? J Yes ✓ 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? J 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite J 6.2.2 Downstream Systems Sensitivity to Coarse Sediment J 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite J 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? J No critical coarse sediment yield areas to be protected based on verification of GLUs onsite J Critical coarse sediment yield areas exist but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP. J 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: 13 Flow Control for Post.Project Runoff" *This Section only required if hydromodification management requirements 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) Flow drains from OMA 1 to a catch basin with a normally closed valve and the water is pumped back to the treatment facility. POC 2) Flow drains from OMA 2 to a catch basin with a normally closed valve and the water is pumped back to the treatment facility. POC 3) Flow drains from OMA 3 to a catch basin which flows directly to the treatment facility. Has a geomorphic assessment been performed for the receiving channel(s)? ✓No, the low flow threshold is 0.1 Q2 (default low flow threshold) J Yes, the result is the low flow threshold is 0.1Q2 J Yes, the result is the low flow threshold is 0.3Q2 J Yes, the result is the low flow threshold is 0.5Q2 If a geomorphic assessment has been performed, provide title, date, and preparer: Discussion/ Additional Information: (optional) 14 Other Site Requirements and Constraints When applicable, list other site requirements or constraints that will influence storm water management design, such as zoning requirements including setbacks and open space, or City codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements. Optional Additional Information or Continuation of Previous Sections As Needed This space provided for additional information or continuation of information from previous sections as needed. Hydromodification is not a concern on this site as the flow increase is negligible and the flows from POC 1, POC 2, and POC 3 are sent back to the treatment facility and reused for all flows less than a 10-year storm which is the threshold for hydromodification. 15 Standard Project Requirement Checklist E-36 Project Information Project Name: Encina Water Pollution Control Facility Primary Treatment Area Improvements Project ID: DWG No. or Building Permit No.: Source Control BMPs All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See Chapter 4 and Appendix E.1 of the BMP Design Manual (Volume 5 of City Engineering Standards) for information to implement source control BMPs shown in this checklist. Answer each category below pursuant to the following. • "Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the Model BMP Design Manual. Discussion/justification is not required. • "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. • "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be provided. Source Control Applied? Reaulrement SC-1 Prevention of Illicit Discharges into the MS4 ✓ Yes No JN!A Discussion/justification if SC-1 not implemented: A storm water pollution prevention plan is already in place that prevents illicit discharges into the MS4. SC-2 Storm Drain Stenciling or Signage jves No ✓ N/A Discussion/justification if SC-2 not implemented: No storm drains are being constructed as part of this project. SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind Yes No ✓ N/A Dispersal Discussion/justification if SC-3 not implemented: No storage areas are included as part of this project. 16 Source Control Requirement (continued) Applied? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and !'(es No v N/A Wind Dispersal Discussion/justification if SC-4 not implemented: No storage areas are included as part of this project. SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal ~es No v N/A Discussion/justification if SC-5 not implemented: No trash storage areas are part of this projects. 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 quidance). On-site storm drain inlets Yes No vN/A Interior floor drains and elevator shaft sump pumps Yes No vN/A Interior parking garages Yes No vN/A Need for future indoor & structural pest control Yes No vN/A Landscape/Outdoor Pesticide Use Yes No vN/A Pools, spas, ponds, decorative fountains, and other water features Yes No vN/A Food service Yes No vN/A Refuse areas Yes No vN/A Industrial processes Yes No vN/A Outdoor storage of equipment or materials Yes No vN/A Vehicle and Equipment Cleaning Yes No vN/A Vehicle/Equipment Repair and Maintenance Yes No vN/A Fuel Dispensing Areas Yes No vN/A Loading Docks Yes No vN/A Fire Sprinkler Test Water Yes No vN/A Miscellaneous Drain or Wash Water Yes No vN/A Plazas, sidewalks, and parking lots Iv Yes No N/A 17 For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers. A stormwater pollution prevention plan is already in place which includes the parking lots: The Operational BMP for parking lots is already included in the SWPPP. "Shall be swept regularly to prevent the accumulation of litter and debris. Debris from pressure washing shall be collected to prevent entry into the storm drain system. Washwater containing any cleaning agent or degreaser shall be collected and discharged to the sanitary sewer and not discharged to a storm drain." Site Design BMPs All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual (Volume 5 of City Engineering Standards) for information to implement site design BMPs shown in this checklist. Answer each category below pursuant to the following. • "Yes" means the project will implement the site design BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of the Model BMP Design Manual. Discussion / justification is not required. • "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. • "N/A" 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 Applied? Reaulrement SD-1 Maintain Natural Drainage Pathways and Hydrologic Features v Yes I No I N/A Discussion/justification if SD-1 not implemented: SD-2 Conserve Natural Areas, Soils, and Vegetation Yes Iv No I N/A Discussion/justification if SD-2 not implemented: Site is already developed as an operating wastewater treatment plant. SD-3 Minimize Impervious Area v Yes I No I N/A Discussion/justification if SD-3 not implemented: 18 SD-4 Minimize Soil Compaction I Yes I No I V N/A Discussion/justification if SD-4 not implemented: There are no landscaped areas as part of the project. SD-5 Impervious Area Dispersion I Yes I ✓ No I N/A Discussion/justification if SD-5 not implemented: The area currently drains to 3 catch basins that collect the flow which is then pumped or conveyed directly to the treatment plant for treatment. Site Design Requirement (continued) I ADolied? SD-6 Runoff Collection I ✓ Yes I No I N/A Discussion/justification if SD-6 not implemented: The project will continue the BMP process of collecting runoff in catch basins and then pumping that flow to the project location's treatment plants for treatment. SD-7 Landscaping with Native or Drought Tolerant Species I Yes I No IV N/A Discussion/justification if SD-7 not implemented: No landscaping is being installed as part of the project. SD-8 Harvesting and Using Precipitation I Yes I No IV N/A Discussion/justification if SD-8 not implemented: 19 SUMMARY OF PDP STRUCTURAL BMPS PDP Structural BMPs All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control must be based on the selection process described in Chapter 5. PDPs subject to hydromodification management requirements must also implement structural BMPs for flow control for hydromodification management (see Chapter 6 of the BMP Design Manual). Both storm water pollutant control and flow control for hydromodification management can be achieved within the same structural BMP(s). PDP structural BMPs must be verified by the City at the completion of construction. This may include requiring the project owner or project owner's representative to certify construction of the structural BMPs (see Section 1.12 of the BMP Design Manual). PDP structural BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the BMP Design Manual). Use this form to provide narrative description of the general strategy for structural BMP implementation at the project site in the box below. Then complete the PDP structural BMP summary information sheet for each structural BMP within the project (copy the BMP summary information page as many times as needed to provide summary information for each individual structural BMP). Describe the general strategy for structural BMP implementation at the site. This information must describe how the steps for selecting and designing storm water pollutant control BMPs presented in Section 5.1 of the BMP Design Manual were followed , and the results (type of BMPs selected). For projects requiring hydromodification flow control BMPs, indicate whether pollutant control and flow control BMPs are integrated together or separate. rrhe general strategy is to continue operating the BMPs currently in place. Modifications to the areas draining to the BMPs is minimal. A harvest and use BMP is already in place for OMA 1, DMA2 and DMA3. For DMAs 1 and 2, this BMP consists of a valve in the catch basins at the downstream end of the DMAs which is normally closed. Stormwater runoff flowing to the catch basins is pumped back to Encina's wastewater treatment facility for treatment. For DMA3 the flow to the catch basin flows directly into the treatment facility. 20 [Continued from previous page -This page is reserved for continuation of description of general strategy for structural BMP implementation at the site.] 21 Structural BMP Summary lnfonnation [Copy this page as needed to provide infonnation for each individual proposed structural BMP] Structural BMP ID No. 1 DWG 1 Sheet No. 1 Type of structural BMP: ✓ Retention by harvest and use (HU-1) J Retention by infiltration basin (INF-1) J Retention by bioretention (INF-2) J Retention by permeable pavement (INF-3) J Partial retention by biofiltration with partial retention (PR-1) J Biofiltration (BF-1) J Flow-thru treatment control included as pre-treatment/forebay for an onsite retention cr biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below) J Detention pond or vault for hydromodification management ✓Other (describe in discussion section below) Purpose: J Pollutant control only J Hydromodification control only J Combined pollutant control and hydromodification control J Pre-treatment/forebay for another structural BMP ✓Other (describe in discussion section below) Discussion (as needed): Retention by harvest and use is already in-place at the downstream end of OMA 1, DMA2, and DMA3. These BMPs treat and reuse the flow by pumping it back or conveying it directly to Encina's wastewater treatment facility 22 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 Sequence Attachment 1 a OMA Exhibit (Required) Attachment 1 b Attachment 1 c Attachment 1 d See OMA Exhibit Checklist on the back of this . Attachment cover sheet. (24"x36" Exhibit typically required) Tabular Summary of DMAs Showing OMA ID matching OMA Exhibit, OMA Area, and OMA Type (Required)* *Provide table in this Attachment OR on OMA 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. ✓ Included J Included on OMA Exhibit h Attachment 1 a ✓Included as Attachment 1b, separate from OMA Exhibit ✓ Included J Not included because the entire project will use infiltration BMPs ✓ Included J Not included because the entire project will use harvest and use BMPs Attachment 1 e Pollutant Control BMP Design ✓ Included Worksheets / Calculations (Required) Refer to Appendices B and E of the BMP Design Manual for structural pollutant control BMP design guidelines 23 ATTACHMENT 1a OMA Exhibit See attached 24" by 36" sheet. Use this checklist to ensure the required information has been included on the DMAExhibit: 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) 24 DMA 1 2 3 Attachment 1 b Tabular Summary of DMAs Existing DMA Type Area (acres) Drains to Retention by 2.11 Harvest and Use BMP Drains to Retention by 0.34 Harvest and Use BMP Drains to Retention by 0.06 Harvest and Use BMP 25 Project Area (acres) 2.27 0.17 0.06 Attachment 1 c Harvest and Use Feasibility Checklist 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? ✓ Toilet and urinal Flushing ✓ 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. There are a total of 70 employees of the Encina Wastewater Authority and 5 visitors per day wer assumed. This results in a toilet and urinal water demand of 793 gallons (106 ft3). While parts o the property are irrigated, all irrigation and landscaping makes use of recycled water from th facility. 3. Calculate the DCV using worksheet B.2-1 . DCV=106cubicfeet 3a. Is the 36 hour demand greater than or equal to the DCV? J Yes / ✓ No q Jl 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? J Yes / ✓ No JJ Harvest and use may be feasible. Conduct more detailed evaluation and sizing calculations to determine feasibility. Harvest and use may only be able to be used for a portion of the site, or (optionally) the storage may need to be upsized to meet long term capture targets while draining in longer than 36 hours. Is harvest and use feasible based on further evaluation? J Yes, refer to Appendix E to select and size harvest and use BMPs. ✓ No, select alternate BMPs. Althou h harvest and use is not re 3c. Is the 36 hour demand less than 0.25DCV? ✓ Yes !1 Harvest and use is considered to be infeasible. Attachment 1 d Categorization of Infiltration Feasibility Form 1-8 Condition 2 Part 1 -Full Infiltration Feasibility Screening Criteria Would infiltration of the full design volume be feasible from a physical perspective without any undesirable consequences that cannot be 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. Yes No ✓ Provide basis: The study area is characterized by hydrologic soil Group D based on Figure C. l from the BMP manual. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. Can infiltration greater than 0.5 inches per hour 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 Aooendix C.2. Provide basis: ✓ rrhe property is located adjacent to areas with slopes >25%, but the property itselfdoes not have slopes ~25%. The site is underlain by alluvial sediment consisting of mostly silty sand, sandy clay, and scatter gravel up to a depth of approximately 19.5 feet below ground surface (Converse Consultants 2017). The tproject site is not located within a currently designated State of California Earthquake fault zone. !However, there are numerous utilities and other underground structures throughout the site that would tnot be acceptable for infiltration. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. i) The Geotechnical Investigation Report: Encina Phase V Wastewater Expansion -New Parking Lot by Converse Consultants (May 2017) provided relevant geotechnical information. 27 Criteri a 3 Form 1-8 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 Aooendix C.3. Yes No ✓ Provide basis: The groundwater table varies but is generally greater than 20 feet based on geotechnical reports performed at the study area (Converse Consultants 2017) and Geo Tracker groundwater data (SWRCB, 2018) within a mile of the study area (Site No. T0608143131 and Site No. T0607302364). Based on GeoTracker, groundwater quality data within the past 10 years is not available near the study area. Stormwater runoff is primarily from the Encina wastewater facility which includes several roads and parking lots. Contaminants from the treatment areas could potentially impact infiltration Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. i) The Geotechnical Investigation Report: Encina Phase V Wastewater Expansion -New Parking Lot by Converse Consultants (May 2017) provided groundwater table data and information. 4 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 Aooendix C.3. ✓ Provide basis: The groundwater table varies but is generally greater than 20 feet based on geotechnical reports performed at the study area (Converse Consultants) and GeoTracker groundwater data (SWRCB, 2018) within a mile of the study area (Site No. T0608143131 and Site No. T0607302364). Based on GeoTracker, groundwater quality data within the past 10 years is not available near the study area. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. i) The Geotechnical Investigation Report: Encina Phase V Wastewater Expansion -New Parking Lot by Converse Consultants (May 2017) provided groundwater table data and information. 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 28 Result: No. Proceed to Part 2. 5 6 Form 1-8 Page 3 of 4 Part 2 -Partial Infiltration vs. No Infiltration Feasibility Screening Criteria Would infiltration of water in any appreciable amount be physically feasible without any negative consequences that cannot be reasonably mitigated? Criteria Screening Question Yes No 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 Appendix D. ✓ Provide basis: The study area is characterized by hydrologic soil Group D based on Figure C.1 from the BMP manual. Also, the DMAs pervious area (1.2 acres) is discontinuous. 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. 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 Aooendix C.2. Provide basis: ✓ Based on a review of a recent geotechnical report in the study area (Converse Consultants 2017) and as- ouilt plans, utilities and structures within the plant make infiltration infeasible. 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. i) The Geotechnical Investigation Report: Encina Phase V Wastewater Expansion -New Parking Lot by Converse Consultants (May 2017) provided groundwater table data and information. 29 7 Criteri a Form 1-8 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. Yes No ✓ Provide basis: The groundwater table varies but is generally greater than 20 feet based on geotechnical reports performed at the study area (Converse Consultants 2017) and Geo Tracker groundwater data (SWRCB, 2018) within a mile of the study area (Site No. T0608143131 and Site No. T0607302364). Based on GeoTracker, groundwater quality data within the past 10 years is not available near the study area. Stormwater runoff is primarily from the Encina wastewater facility which includes several roads and parking lots. Anticipated stormwater pollutants from roadways and parking lots include heavy metals, organic compounds (including petroleum hydrocarbons), trash and debris; however, these pollutants can be treated. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. i) The Geotechnical Investigation Report: Encina Phase V Wastewater Expansion -New Parking Lot by Converse Consultants (May 2017) provided groundwatertable data and information. 8 Can infiltration be allowed without violating downstream water rights? The response to this Screening Question shall be based on a comprehensive evalui,ition of the factors presented in Appendix C.3. ✓ Provide basis: There are no apparent water rights cases. 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 * Result: No If all answers from row 5-8 are yes then partial infiltration design is potentially Infiltration 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. 30 Attachment 1 e Pollutant Control BMP Design Worksheets / Calculations The design control volume (DCV) calculations are shown in the following table. Based on Appendix B.1 of the City of Carlsbad BMP Design Manual, the DCV is equal to: DCV(Jt3) = 3,630 * C * d * A Where C is equal to the runoff factor (unitless), dis equal to the 85th percentile, 24-hr storm event rainfall depth (0.575 inches), and A is equal to the drainage management area (OMA) in acres. The runoff factor was determined based on impervious and pervious cover within each OMA based on the composite runoff factor equation from appendix B.1.1. in the BMP manual. Existing Conditions Area Impervious Area Runoff Factor C OCV OMA OMA Type (acres) (acres) (unitless) (tt3) 1 Drains to BMP 2.11 1.81 0.79 3463 2 Drains to BMP 0.34 0.19 0.55 388 3 Drains to BMP 0.06 0.03 0.50 63 Project Conditions Area Impervious Area Runoff Factor C DCV Percent Increase in DCV OMA OMA Type (acres) (acres) (unitless) (tt3) (Existing to Project Conditions) 1 Drains to BMP 2.27 1.99 0.80 3797 9.6 2 Drains to BMP 0.17 0.17 0.90 319 -17.7 3 Drains to BMP 0.06 0.06 0.90 113 80.0 Diversion flow rates for offline BMPs were calculated based on a rainfall intensity of 0.2 in/hr. The diversion flow rates for each OMA are shown in the following table. Area Impervious Area Runoff Factor C Off-Line BMP Volume OMA (acres) (acres) (unitless) (ft3/s) 1 2.27 1.99 0.80 0.36 2 0.17 0.17 0.90 0.03 3 0.06 0.06 0.90 0.01 31 Given: Calculations: Pump Calculations Pump type: ABS Rousta 300 Head Required: 3m Flow rate: 10.5 cubic meters/hour equals 370.8 cubic feet/hour 1 cubic meter per hour equals 35.3147 cubic feet per hour 24hour85th percentile flow Pump OMA volume Flow rate Time ft"3 ft"3/hour hours 1 3800 370.8 10.2 2 319 370.8 0.9 3* 113 N/A N/A * DMA 3 drains directly to treatment facility. 32 Criteria- Pump Volume in less than 24 hours Acceptable time Yes/No < 24 hours Yes < 24 hours Yes N/A Yes ATTACHMENT 2 BACKUP FOR PDP HYDROMODIFICATION CONTROL MEASURES [This is the cover sheet for Attachment 2.] Indicate which Items are Included behind this cover sheet: Attachment Contents Checklist Seauence Attachment 2a Hydromodification Management ✓ Included Exhibit (Required) See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. Attachment 2b Management of Critical Coarse ✓ Exhibit showing project drainage Sediment Yield Areas (WMAA Exhibit boundaries marked on WMAA is required, additional analyses are Critical Coarse Sediment Yield optional) Area Map (Required) See Section 6.2 of the BMP Design Optional analyses for Critical Coarse Manual. Sediment Yield Area Determination J 6.2.1 Verification of Geomorphic Landscape Units Onsite J 6.2.2 Downstream Systems Sensitivity to Coarse Sediment J 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite Attachment 2c Geomorphic Assessment of Receiving ✓ Not performed Channels (Optional) J Included See Section 6.3.4 of the BMP Design Manual. Attachment 2d Flow Control Facility Design and ✓ Not performed -Flows are pumped Structural BMP Drawdown back or drain directly to Encina's Calculations (Required) wastewater treatment facility for flows See Chapter 6 and Appendix G of the less than a 10-year storm which is the ~hreshold for hydromodification. BMP Design Manual J Included 33 Use this checklist to ensure the required information has been included on the Hydromodification Management Exhibit: The Hydromodification Management Exhibit must identify: ✓ Underlying hydrologic soil group ✓ Approximate depth to groundwater ✓ Existing natural hydrologic features (watercourses, seeps, springs, wetlands) ✓ Critical coarse sediment yield areas to be protected (if present) ✓ Existing topography ✓ Existing and proposed site drainage network and connections to drainage offsite ✓ Proposed grading ✓ Proposed impervious features ✓ Proposed design features and surface treatments used to minimize imperviousness ✓ Point(s) of Compliance (POC) for Hydromodification Management ✓ Existing and proposed drainage boundary and drainage area to each POC (when necessary, create separate exhibits for pre-development and post-project conditions) ✓ Structural BMPs for hydromodification management (identify location, type of BMP, crd size/detail) 34 Attachment 2a (Pre-Project) See attached 24" by 36" sheet. 35 Attachment 2a (Post-Project) See attached 24" by 36" sheet. 36 --Q--_._..,,..._ __ Qaa,I,,_,__,,.._ Attachment 2b Potential Critical Coarse Sediment Yield Areas Regional San Diego County Watersheds The project is not in critical course sediment yield area. 37 ~ Detr. Sept. 8. 201• Geosyntec ATTACHMENT 3 Structural BMP Maintenance Information Use this checklist to ensure the required information has been included in the Structural BMP Maintenance Information Attachment: Preliminary Design/Planning/CEQA level submittal: Attachment 3 must identify: J 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) The catch basin, which has a closed valve and holds water which is pumped for treatment at the on-site Encina Wastewater treatment facility, will require the following maintenance indicators and actions: i) Accumulation of sediment, litter, or debris will be removed and properly disposed of and ii) structural components of the pump useid to pump water for treatment repaired or replaced as needed. ✓ How to access the structural BMP(s) to inspect and perform maintenance The catch basin is easily accessed from the ground surface. ✓ 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) ✓ Manufacturer and part number for proprietary parts of structural BMP(s) when applicable. N/A ✓ 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.) N/A. ✓ Recommended equipment to perform maintenance Cleaning out of the catch basins can make use of a vacuum. ✓ When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management. N/A 38 .. --- 111111 -.. -.. -1111 .. .. 111111 .. .. .. --.. .. .. -.. .. .. .. - 1111 -- --.. ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit See attached 24" by 36" sheet. 39 I I I I I I I I Use Rational Method: 2-year P6= P24 = P6 must be btw. 45-65% of P24 (increase P6 as necessary) Adjusted Ratio = Adjusted P6 = OMA 1 2 3 OMA 1 2 3 OMA 1 • Exlstln1: Area (acresl 2.11 OMl! l · Prolm: Area (acresl 2.27 I I I I I I ' ' I I I I I I I I I I Attachment 5 -Drainage Calculations 10-year 1.2 P6= 1.8 P24= P6 must be btw. 45-65% of P24 (increase P6as 0.67 necessary) Adjusted Ratio 0.65 1.17 Adjusted P6 = 12-Year, 6-hr rainfall 10-yr, 6-hr rainfall (1.2 Inches) (1.75 Inches) Existing Peak Flow Existing Peak Flow (ft3/s) (ft3/s) 5.9 8.8 0.9 1.4 0.2 0.2 Project Peak Flow Project Peak Flow (ft3/s) (ft3/s) 6.3 9.4 0.5 0.7 0.2 0.2 Runoff Coefficient Pen,ious Area (uses Eqn. on pg. 3-Longest Flow (acresl SofSOHM) Path (ftl 0.30 0.90 765 Pervious Area Runoff Coefficient Lon1est Flow (acres) Path (ft) 0.28 0.90 765 1.75 3 0.58 0.58 1.75 Upstream Elevation (ftl 34.1 Upstream Elevation (ft) 34.1 Downstream Slope Elevation (ftl (%1 26.8 0.95 Downstream Slope Elevation (ftl (%) 26.8 0.95 Tc,mln Maximum Length (overland) (Lm per Table 3-2 based on Fig. 3- ofSOHMI 3 60 2.8 Tc,min Maximum Length (overland! (Lm per Table 3-2 based on Fi1. 3- ofSOHMI 3 60 2.8 ' 1 I I I I I I I I f -, I (in/hrl, 2-yr I (In/hr), 10- based on Fig yr based on Qp, 2-yr Qp, 10- Tc,mln 3-1 Fl13·1 lcfsl yr lcfsl 5.0 3.1 4.6 5.9 8.8 I (ln/hrl, 2-yr I (in/hrl, 10- based on FIB yr based on Qp, 2-yr Qp, 10- Tc,mln 3-1 Fl13·1 (cfs) yr (cfs) 5.0 3.1 4.6 6.3 9.4 DMA 2 -Exlstl[!I: Tc,min Runoff Coefficient Upstream Maximum Length (overland) I (In/hr), 2-yr I (In/hr), 10- Pervlous Area (uses Eqn. on pg. 3-Lon1est Flow Elevation Downstream Slope (Lm per Table 3-2 based on Fl1. 3-based on Fl1 yr based on Qp,2-yr Qp, 10- Area (acres) (acres) SofSDHM) Path (ft) (ft) Elevation (ft) '"' ofSDHM) 3 Tc,mln 3-1 Fl13-1 (cfs) yr (cfs) 0.34 0.15 0.90 200 29.8 28.8 0.50 60 3.5 5.0 3.1 4.6 0.9 1.4 DMA i · l![oject: Tc,mln Upstream Maximum Length (overland) I (In/hr), 2-yr I (In/hr), 10- Pervlous Area Runoff Coefficient Lonaest Flow Elevation Downstream Slope (Lm per Table 3-2 based on Fl1. 3-based on Fl1 yr based on Qp,2-yr Qp, 10- Area (acres) (acres) Path (ft) (ft) Elevation (ft) '"' ofSDHM) 3 Tc, min 3-1 Fl13-1 (cfs) yr (cfs) 0.17 0.00 0.90 200 29.8 28.8 0.50 60 3.5 5.0 3.1 4.6 0.5 0.7 DMA 3 -Exlstl[!I: Tc,min Runoff Coefficient Upstream Maximum Length (overland) I (In/hr), 2-yr I (In/hr), 10- Pervlous Area (uses Eqn. on pg. 3-Lonaest Flow Elevation Downstream Slope (Lm per Table 3-2 based on Fla, 3-based on FIi yr based on Qp,2-yr Qp, 10- Area (acres) (acres) SofSDHM) Path (ft) (ft) Elevation (ft) '"' ofSDHM) 3 Tc,mln 3-1 Fl13-1 (cfs) yr (cfs) 0.06 0.00 0.90 20 34.1 33.8 1.50 60 2.4 5.0 3.1 4.6 0.2 0.2 DMA 3 -Project: Tc,min Upstream Maximum Length (overland) I (In/hr), 2-yr I (In/hr), 10- Pervlous Area Runoff Coefficient Lonaest Flow Elevation Downstream Slope (Lm per Table 3-2 based on Fi1. 3-based on FIi yr based on Qp, 2-yr Qp, 10- Area (acres) (acres) Path (ft) (ft) Elevation (ft) '"' ofSDHM) 3 Tc,mln 3-1 Fl13-1 (cfs) yr (cfs) 0.06 0.00 0.90 20 34.1 33.8 1.50 60 2.4 5.0 3.1 4.6 0.2 0.2 a I I A I I I I I I I I I I I J I I I J I I l I I J •-~ l J l J l J I._ _. .. ~ "O X E (1) C LL <(I .,... _1 C (I) E ..c ll (1) ~ Cl) c., --0.. ~ a 5 ~I --..>:: ... 0 5 t5 Q) -~ 2 0.. r::o -<( a UJ (_) (1) OJ ~ i::' (1) E ... 0.. 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Gutters and Brow Ditches D Project Disturbances 0 25 50 100 Project#: 0011175 ~ :::::::::: Feet Map Created : November 2018 LL Third Party GIS Disclaimer: This map is for reference and graphical purposes only and should not be relied upon by third parties for any legal decisions. Any reliance upon the map or data contained herein shall be at the users' sole risk. -0 X E -u QJ .5' ,_ 0.. I ~ [ JU o.., (ll .. ~I ~ C: ' ..... & QJ ' E {i '11>• (ll ~ (f) ' ' ac ., ~ 4.ll ...- 48 ; .,,, . ,. ,, . "' "" ' '"' :\;J POC13 ~ ._..___,. ""• \>9 w ' ,.. ,.. .,., 3U \ \_g "·' ,,. ..., "'' ... ,.. "' (') -0.. , .... ~ a s ~I -.:,,,; ,_ 0 s u QJ -~ 0.. en <( a w u cu QJ L <( >, ,_ (ll E ·c Q ' I.!') r--. ..... ..... ..... 0 0 s.. ·"= ,_ 0 .c -::J <( L QJ ,_, (ll s: QJ ..., (/) m > m C u C IJ J ' I.!') 0 (") 0 > O:' -u 2 rY ,gi u QJ -~ e (l_ -·o ~ m .c (/) -+' QJ C C ~ L :::, u -0 ,_ cu -0 0 0 J 01 C (/) :J r · cu ,,..., ·.:- m ' 1 7 ••. 1 \ ' \ " , 11• >I _, \ \ >u \ ,. '" ' \ ,., "·' '" '" \ ,,. ,, ' ' \ _.,, ' '" \ • )2.~ 2 \ '" ' "\ \ ' ' ' 1,. • .,. .,} ~ \ ,,, ... "" \ ' \ "' YI 7 ,I ' ' \ ~ \ ,, \ ,IU ' ,, "' ' ' \ ,.. ' \ " ... , .. , " ,,. • >, OJ E QJ • E ,~~-:---=-==.;.;....:.__ ~rf-:"p~:J ... :J \ "'" d•t• t• • • • I()\_ DMA Hydromo I 1ca ~on ·--• Property Outline . l(Y CDS Unit D 1 <X) ~ 0 N ---1.!') ..... -,-..... Exhibit (pre-Pro J ect) ~ ► Runoff Flow Direclion ~ Catch Basin (BMP: Retention by HU) D 2 ,u ,,, , .. ' .. . . 2i.~ , .. '" U7 11.J ... 7 N " ~!' .3- ~ i ·' t '" \ '\ ~ 'J1A ' ,, ,. ' \ - ,,, '" '" For all DMAs (]) ► Pipes • POC CJ 3 u Depth to Groundwater> 10 ft g, ~t Gutters •nd Brow Ditches F==1 Pervious to lmper-Aous . ~ . . _ ....J t:::::=I p roJect #: 001117 5 :c Hydrolog1c S011 Group -D ,---, Project Disturbances O 25 50 100 Map Created:November 2018 w • BMP L........J Feet ~ OMA Type = Drains to 01 LL Third Party GIS Disclaimer: This map is for reference and graphical purposes only and should not be relied upon by third parties for any legal decisions. Any reliance upon the map or data contained herein shall be at the users' sole risk. " "O X E t5 (I) 'o' '-a.. t=il 0 a.. rol ~I C (I) E 370 ,.,,. _.,,. !O~ lM 73 3-71 IC; -5 l\:ie, ro ~ <r Cl) ('.) 0:: 2 a '> :I -'<'. '-0 s u (I) o' '-a.. co <( a w 0 ro (I) '-<( 2'.' ro E ·c a.. I.Cl I'--..... ..... ..... 0 0 S, ..... '-0 .c: ...., ::, <( '-Q) ...., ro ~ ...., (f) ro s ro C 0 C w ' I.Cl 0 (") 0 --> a' -(.) ~ 0:: --2 [J (I) ·a L n"' "O ~ ' '..,. ' \ '1/U .. ' lo!< ?.e-2 35.7 \· . 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' · -· · -\. · . · ·. · ·. · . -::· -·. ·. · ·. · ·. · ·. · · DISINFEC N·. · ·. · .'-·;·. . .· ;.· . ·-. . · . · · r :::. · · . · · . · · . · · . · · . · · • · · • · · • · · • · · • · · ':-'-· ·' · · · · · · · ·Ell · · Q. · -· · · · · · MH 7· CHLORINATION · · -· · · · ·. \ · .-·.-· · ·. · ·. · ·. · . ·. · · -· · Aiii.ir,1,~--no111 · · ·. · · ·. · · · . · · ·. . · · ·. · · -rc,T• . · -· · · · · · · ·_. ·. · . · · ·. -auii..DING. --. · · · · ·. · --· . . . . -. . . . . . . ·su1·u,1NG0 • • • • • • • • • • • • • • • • • • • • • • • • -• -r·. . · -~ · 0--: .--. . · -. · . · . . · . . . · . . · -. · . . · -. · · .:., · . • • • r . • • . • • • • • • • • • • • • • • • 1 . • . . . . . . . • ---:-EFFt.!JEJff. . . ~. . . . . . . . . . . . . . . . . . . . ·w . . -. . --..... -.. -. . . . -. . . ·n· . . .PUMFINt;... . . . . . . . . . . . . • ~~-. . . . . ·. ~· ·. ·. -.-· · . ~· . · . · . · . . -_ --. . · · . · _. · · ·_...:__, ·r · . · · . \ ! : ·STATION.:='· _ · · . ·_ . • . ·• · .. · .. · · •• · • ·. • ·. . ·. . ~. . . . . .. E C y . 4 .. I ' ' IL_ ) I • I I I I I I ir, (/] w i= _J u ,c( I.!... I=! 0 ::!: w a:: ~ b::I ,--' ~ 0 a:: I.&.. o Z <e>Q z :::> 0:: 28"[)9'00" PLANT NORTH 50' 0 50' 1 oo· SCALE: 1" = 1 00' -0" (11 X17) LEGEND -- --------- @)-------- CB# m CB# ffl w DL#. SL#. t . . l L NOTES PROPERTY LINE RUNOFF FLOW DIRECTI ON GUTTERS AND BROW DITCHES PIPES AND CULVERTS MANHOLE SU MP DRAIN AGE CATCH BASIN OFF-SITE DRAINAGE CATCH BASIN HARVEST & USE CATCH BASIN IN-PLANT DRAINAGE DISCHARGE LOCATI ON SAM PLIN G LOCATI ON IM PER~OUS AREA CHEM ICAL STORAGE AREA 1. ALL IN-PLANT DRAINAGE CATCH BASINS SERVE TO COLLECT RUNOFF AND ALLOW IT TO BE CONVEYED TO THE WASTEWATER 1REA1MENT SYSTEM FOR APPROPRIATE 1REA1MENT. 2. TOPOGRAPHY SHOWN IS BASED ON A SITE SURVEY DATED MAY 11 , 2003. PLANT ELEVATION DAlUM IS BASED ON THE U.S. COAST AND GEODETIC SURVEY BENCH MARK K131---1933 WlTH AN ELEVATI ON OF 47.415 FT. it <c ·, < <<·· < >~~ ··. · ·.·. \ , 0 \l BS'.?:-2 ~ > \:S •·•·••·l > , ·, · l \"'·· , · 1/ _:~. :· .. ·~· ---•~•::·•·:. :-.:-:·-:.:•:·.~-.... •: :•::-::>~.-.-·~-•S?·· ·.·•:~•·~ ~9 .. : :_ : .. :: ... _ ~---:--_--_-· :· _-::.: _-.: ·:. :·_ :·•:·:~ •-· .. :·. ::• .··• ~.:·•:: ' c: ·._· · · .. · · ·. · SWMP NO. • PLAN PREP ARED BY 3. SEE PROJECT SWMP FOR ADDITIONAL INFORMATION. ----. . . . ~,;;_ · · .. · ... ·. ·.·· · .. _·. ·. ·-. .:. ._-. . ·. · .-.;. ·. -._-. · .... _-. · .. ~~ E . . . _-. '.~· ·. ·_ · · ·. ·. STORMIAIATER ' 20 f __ PARTY RESPONSIBLE FOR MAINTENANCE r-----_:..., .. ·· ,, . L-.c--_..,_=" ~.-. ·. ·;-· ... _-_. ._-... · .. ·:-:--:._~ ~--....... _-· .. _-,:,---~lllli . _-·. · · .... iF ~r·~·--·.--· ·. -.. _-. __ . ~. DL;>. ·. OJSCHA~GE :~U~M:P~::::=::::=::::=::::=:::::~~::::=::::=:::::::::::::::::::::='r-::::== NAME ENCIN A WASTEWATER AUTH ORITY COMPANY -.-·-"'",::---. . . ., ~-. ~.~·--. · .. ·. -f~j'._-. ": '":_ . _-.. _-_-._-. _-._ ~:_ · ·. · . -·-•· ~ . · _-_--: · · -I.· _-.·. · . _ llON.s> SL2 :t-ADDRESS 6200 AVENI DA ENCIN AS. ADDRESS ----1-•-. ...,..:._.'--·-...,..·-'::-'. ,_. -~ ~~. . ~ 00 • _ 2_. ~ ·-.. · ~-·~.~.~.~ .: ~. ~ . (-~-~ :-.-.. · .. :· :-.-·.: _.-.~. _-:·. ·.:· ·:~ .. :-~·--.:·: :, .-.: fflCBl • • ~~ CARLSBAD. CA 92011 -~,. . . . -~ tr ...0-~~-~ . . ·_ -•• -•.• • __ • -~-• -.-·_. . • .:......:..~ ... ·.. . . . • . ... -. . -. . ~ ~ • OUTFAO..---r . -. -. . r • -24"1!1 :;5 CONTACT DOUG CAMPBELL NAME CONTACT KATHLEEN HIGGINS SIGNATURE _______ _ WOODA RD AN D CURRAN 10509 ~STA SORRENTO PKWY. SUITE 205 SAN DIEGO. CA 92121 KATHLEEN HIGGINS · -· · . · -.~ ·=· ~1::.===· ===· ~· ·s·:::. ~·i. . · · ~ ;A.TIO...._ ·-c--C · · · ~· · · ......... ~ . . . ..... .,.___, --. . . . -.--- ----0-~ ·. ·. ·.· .. · .. ·._ •· ·._.; --/ .· .. ·. I PHONE NO. 760-438---3941 PHONE NO. 949-420-5313 CER TIFICATION 43323 ...c._...:_✓-==~-===·=========~~===· ~-~~=·~-=·=--~.-~-: ~::----~ _:6~~~ < .. _..;,·._-Iii,;. 'i:::/'lill CBS m . ·=. . -=. . . ;_ . . . . . . . . ... \...· . . . . . . . . . ..... . -.r A 1 .. ""' WOODARD &CURRA N 105 09 ~STA SORRENTO PK WY SUI TE 205 SAN DIEGO, CA 92121 WOODARDCURRAN.COM . . . ~-. ==. ·::·· · ·==~~~·~· · ~· -r·---~--'-'='.~~-~~2 .. ·-. ... _,. ·~-+- ENCINA WASTEWATER AUTHORITY SAN DI EGO COUNTY, CALIFORNIA BMP TABLE BMP ID 1 0 BMP TYPE HARVEST & USE HARVEST & USE SYMBOL CASQA NO. QUANTITY 2 EA w 1 EA ENCIN A WATER PO LLUTI ON CO NTROL FAC ILITY SIN GLE SHEE T BMP SITE PL A N DRAWI NG NO. SHEET NO. INSPECTI ON FREQUENCY QUARTERLY QUARTERLY MAINTENANCE FREQUENCY AS NEEDED AS NEEDED JOB NO. DATE 00111 75.00 NOVEMBER 2018 SHEET NO. 1 OF 1