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CT 2021-0002; GARFIELD BEACH HOMES; PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP); 2023-05-01
CITY OF CARLSBAD PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR 3570 GARFIELD STREET CT 2021-0002 / PUD 2021-0007 / CDP 2021-0038 [INSERT DRAWING No. (DWG 538-2 A )] [INSERT GR No. 2022-0024] ENGINEER OF WORK: _____________________________________________ TYLER G LAWSON, PE #80356 PREPARED FOR: RINCON CAPITAL 5315 AVENIDA ENCINAS, SUITE 200 CARLSBAD, CA 92008 PH: (888) 357-3553 PREPARED BY: PASCO, LARET, SUITER & ASSOCIATES 535 N. HWY 101, SUITE A SOLANA BEACH, CA 92075 PH: (858) 259-8212 DATE: JULY 2021 REVISED: JANUARY 2023; MAY 2023 E-35 REV 08/22 STORM WATER QUALITY C•h, · f MANAGEMENT PLAN l _LJ 0 1 (SWQMP) TEMPLATE Carlsbad E-.35 (FOR PDP PROJECTS ONLY) D,evelo-pment Services Land DeYelo;pment IEingiin.eering 1635 Faraday Avenue 442-339-2750 wvA-v .ca rlls had.ca.gov 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 1a: DMA Exhibit Attachment 1b: Tabular Summary of DMAs and Design Capture Volume Calculations Attachment 1c: Harvest and Use Feasibility Screening (when applicable) Attachment 1d: Infiltration Feasibility Analysis (when applicable) Attachment 1e: Pollutant Control BMP Design Worksheets / Calculations Attachment 1f: Trash Capture BMP Requirements 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: 3750 GARFIELD STREET Project ID: (CT 2021-0002 / PUD 2021-0007 / CDP 2021-0038) I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order. I have read and understand that the City Engineer has adopted minimum requirements for managing urban runoff, including storm water, from land development activities, as described in the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable source control and site design BMPs proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I understand and acknowledge that the plan check review of this SWQMP by the City Engineer is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of storm water BMPs for this project, of my responsibilities for project design. ________________________________________________________ Engineer of Work's Signature, PE Number & Expiration Date Tyler Lawson_____________________________________________ Print Name Pasco, Laret, Suiter & Associates_____________________________ Company 05/05/2023_________________________ Date PROJECT VICINITY MAP VICINITY MAP SCALE:NTS STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue 442-339-2750 www.carlsbadca.gov To address post-development pollutants that may be generated from development projects, the city requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual, refer to the Engineering Standards (Volume 5). This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to ‘STANDARD PROJECT’ requirements, “PRIORITY DEVELOPMENT PROJECT (PDP) requirements or not considered a development project. This questionnaire will also determine if the project is subject to TRASH CAPTURE 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: APN: ADDRESS: The project is (check one): New Development Redevelopment The total proposed disturbed area is: ft2 ( ) acres The total proposed newly created and/or replaced impervious area is: ft2 ( ) 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. This Box for City Use Only City Concurrence: YES NO Date: Project ID: By: E-34 Page 1 of 4 REV 08/22 INSTRUCTIONS: E-34 Page 2 of 4 REV 08/22 STEP 1 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 6, mark the 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. STEP 2 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer the following questions: Is your project LIMITED to one or more of the following: YES NO 1. Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: a) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non- erodible permeable areas; OR b) Designed and constructed to be hydraulically disconnected from paved streets or roads; OR c) Designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets guidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in 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 6, mark the second box stating “my project is EXEMPT from PDP …” and complete applicant information. Discussion to justify exemption (e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance): If you answered “no” to the above questions, your project is not exempt from PDP, go to Step 3. E-34 Page 3 of 4 REV 08/22 STEP 3 TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS 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 greater. 5. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is 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, complete the trash capture question. If you answered “no” to all of the above questions, your project is a ‘STANDARD PROJECT’. Go to step 5, complete the trash capture question. * Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water 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. E-34 Page 4 of 4 REV 08/22 STEP 4 TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP) ONLY Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)): YES NO Does the redevelopment project result in the creation or replacement of impervious surface in an amount of less than 50% of the surface area of the previously existing development? Complete the percent impervious calculation below: Existing impervious area (A) = sq. ft. Total proposed newly created or replaced impervious area (B) = sq. ft. Percent impervious area created or replaced (B/A)*100 = % If you answered “yes”, the structural BMPs required for PDP apply only to the creation or replacement of impervious surface and not the entire development. Go to step 5, complete the trash capture question. If you answered “no,” the structural BMP’s required for PDP apply to the entire development. Go to step 5, complete the trash capture question. STEP 5 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS Complete the question below regarding your Project (SDRWQCB Order No. 2017-0077): YES NO Is the Project within any of the following Priority Land Use (PLU) categories and not exempt from trash capture requirements per section 4.4.2.2 of the BMP Manual? R-23 (15-23 du/ac), R-30 (23-30 du/ac), PI (Planned Industrial), CF (Community Facilities), GC (General Commercial), L (Local Shopping Center), R (Regional Commercial), V-B (Village-Barrio), VC (Visitor Commercial), O (Office), VC/OS (Visitor Commercial/Open Space), PI/O (Planned Industrial/Office), or Public Transportation Station If you answered “yes”, the ‘PROJECT’ is subject to TRASH CAPTURE REQUIREMENTS. Go to step 6, check the first box stating, “My project is subject to TRASH CAPTURE REQUIREMENTS …” and the second or third box as determined in step 3. If you answered “no”, Go to step 6, check the second or third box as determined in step 3. List exemption if applicable for ‘no’ answer here: STEP 6 CHECK THE APPROPRIATE BOX(ES) AND COMPLETE APPLICANT INFORMATION My project is subject to TRASH CAPTURE REQUIREMENTS and must comply with TRASH CAPTURE REQUIREMENTS of the BMP Manual. I understand I must prepare a Storm Water Quality Management Plan (SWQMP). My project is a ‘STANDARD PROJECT’ OR EXEMPT from PDP and must only comply with ‘STANDARD PROJECT’ stormwater requirements of the BMP Manual. I will submit a “Standard Project Requirement Checklist Form E-36”. If my project is subject to TRASH CAPTURE REQUIREMENTS, I will submit a TRASH CAPTURE Storm Water Quality Management Plan (TCSWQMP) per E-35A. 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) per E-35 template for submittal at time of application. 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. 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: SITE INFORMATION CHECKLIST Project Summary Information Project Name 3570 GARFIELD STREET Project ID (CT 2021-0002 / PUD 2021-0007 / CDP 2021-0038) Project Address 3570 Garfield Street Carlsbad, CA 92008 Assessor's Parcel Number(s) (APN(s)) 204-240-13 & -14-00 Project Watershed (Hydrologic Unit) Carlsbad 904.31 (Agua Hedionda) Parcel Area _0.57___ Acres (__24,911___ Square Feet) Existing Impervious Area (subset of Parcel Area) _0.12___ Acres (__ 5,187 ___ Square Feet) Area to be disturbed by the project (Project Area) _0.57___ Acres (__24,911___ Square Feet) Project Proposed Impervious Area (subset of Project Area) _0.42___ Acres (__18,370__ Square Feet) Project Proposed Pervious Area (subset of Project Area) _0.15___ Acres (__6,541_____ 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 Previously graded but not built out Agricultural or other non-impervious use Vacant, undeveloped/natural Description / Additional Information: Refer to next page for description Existing Land Cover Includes (select all that apply): Vegetative Cover Non-Vegetated Pervious Areas Impervious Areas Description / Additional Information: Refer to next page for description Underlying Soil belongs to Hydrologic Soil Group (select all that apply): NRCS Type A NRCS Type B NRCS Type C NRCS Type D Approximate Depth to Groundwater (GW): GW Depth < 5 feet 5 feet < GW Depth < 10 feet 10 feet < GW Depth < 20 feet GW Depth > 20 feet Existing Natural Hydrologic Features (select all that apply): Watercourses Seeps Springs Wetlands None Description / Additional Information: Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from the site? At a minimum, this description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]: (1) Existing drainage conveyance can be categorized as natural. There is not any significant drainage infrastructure onsite to convey storm water, and water travels through the site on the surface by way of sheet flow. Water eventually leaves the site to the east towards the eastern property line. Runoff will continue to sheet flow across the extent of the eastern boundary. Just offsite on the property to the east exists an open lot. In a rain event, drainage eventually makes its way to the lot by means of sheet flow or local low spots to continue north through the adjacent property towards Acacia Avenue. Once in Acacia Avenue, runoff enters an existing storm drain curb inlet and is conveyed toward the outlet in the Agua Hedionda Lagoon via buried pipe network. (2) There are not any existing onsite storm water conveyance systems. Water eventually leaves the subject property at the eastern property line. Drainage leaving the site flows on the surface and continues in an easterly direction. (3) The entirety of the Garfield Street right-of-way will discharge offsite onto Garfield Street. Description of Proposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: The project proposes to demolish all existing onsite structures, clear and grub the site, and construct 12 new multi-family for-sale condominium units with along with other hardscape and landscape improvements typical of this type of development. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): Proposed impervious features onsite include buildings / roof areas, concrete walkways, driveways, and drive aisles. List/describe proposed pervious features of the project (e.g., landscape areas): Proposed pervious features onsite include landscaping and a bioretention treatment control BMP. Does the project include grading and changes to site topography? Yes No Description / Additional Information: Project proposes to precise grade the site along with some changes to onsite topography. The onsite grading consists of approximately 265 CY of cut and 2,370 CY of fill, resulting in 2,105 CY of import. The proposed drainage system has been designed to flow from west to east into a bioretention basin with partial retention for treatment control and detention. Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? Yes No Description / Additional Information: Although the project proposes onsite grading, the drainage patterns after precise grading mimic pre-development patterns. The site will continue to drain from west to east, and discharge along the eastern property line. In pre-development condition runoff sheet flows across the lot from west to east. In the post-development condition new drainage infrastructure will be installed to direct drainage toward a bioretention basin near the eastern property line. The proposed bioretention basin and rip rap area will be used to manage storm water flows. Identify whether any of the following features, activities, and/or pollutant source areas will be present (select all that apply): On-site storm drain inlets Interior floor drains and elevator shaft sump pumps Interior parking garages Need for future indoor & structural pest control Landscape/Outdoor Pesticide Use Pools, spas, ponds, decorative fountains, and other water features Food service Refuse areas Industrial processes Outdoor storage of equipment or materials Vehicle and Equipment Cleaning Vehicle/Equipment Repair and Maintenance Fuel Dispensing Areas Loading Docks Fire Sprinkler Test Water Miscellaneous Drain or Wash Water Plazas, sidewalks, and parking lots Identification of Receiving Water Pollutants of Concern Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable): Storm water sheet flows directly east to the property adjacent then ultimately makes its way North to Acacia Street. From here the water enters existing public storm drain infrastructure entering the buried pipe network drainage is routed south to ultimately outlet to the Agua Hedionda Lagoon and to the Pacific Ocean. List any 303(d) impaired water bodies within the path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the pollutant(s)/stressor(s) causing impairment, and identify any TMDLs for the impaired water bodies: 303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs Agua Hedionda Lagoon Indicator Bacteria Nutrients Sedimentation / Siltation Toxicity Identification of Project Site Pollutants Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see Table B.6-1 below): Pollutant Not Applicable to the Project Site Anticipated from the Project Site Also a Receiving Water Pollutant of Concern Sediment X Nutrients X Heavy Metals Organic Compounds Trash & Debris X Oxygen Demanding Substances X Oil & Grease X Bacteria & Viruses X Pesticides X TABLE B.6-1. Anticipated and Potential Pollutants Generated by Land Use Type Priority Project Categories General Pollutant Categories Sediment Nutrients Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides Detached Residential Development X X X X X X X Attached Residential Development X X X P(1) P(2) P X Commercial Development >one acre P(1) P(1) X P(2) X P(5) X P(3) P(5) Heavy Industry X X X X X X Automotive Repair Shops X X(4)(5) X X Restaurants X X X X P(1) Hillside Development >5,000 ft2 X X X X X X Parking Lots P(1) P(1) X X P(1) X P(1) Retail Gasoline Outlets X X X X X Streets, Highways & Freeways X P(1) X X(4) X P(5) X X P(1) X = anticipated P = potential (1) A potential pollutant if landscaping exists onsite. (2) A potential pollutant if the project includes uncovered parking areas. (3) A potential pollutant if land use involves food or animal waste products. (4) Including petroleum hydrocarbons. (5) Including solvents. Trash Capture BMP Requirements The project must meet the following Trash Capture BMP Requirements (see Section 4.4 of the BMP Design Manual): 1) The trash capture BMP is sized for a one-year, one-hour storm event or equivalent storm drain system, and 2) the trash capture BMP captures trash equal or greater to 5mm. Description / Discussion of Trash Capture BMPs: Trash capture BMPs will not be used as we are using permanent biofiltration BMPs onsite. 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. 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): Per “Hydromodification Exemption analyses for the select Carlsbad Watersheds” dated June 10, 2013 by Chang Consultants our project site is considered HMP exempt. 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? 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 Appendix H of the manual been performed? H.6.1 Site-Specific GLU Analysis H.7 Downstream Systems Sensitivity to Coarse Sediment H.7.3 Coarse Sediment Source Area Verification 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 H.2, H.3, and H.4 as applicable, and the areas are identified on the SWQMP Exhibit. Discussion / Additional Information: 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. Has a geomorphic assessment been performed for the receiving channel(s)? No, the low flow threshold is 0.1Q2 (default low flow threshold) Yes, the result is the low flow threshold is 0.1Q2 Yes, the result is the low flow threshold is 0.3Q2 Yes, the result is the low flow threshold is 0.5Q2 If a geomorphic assessment has been performed, provide title, date, and preparer: Discussion / Additional Information: (optional) Other Site Requirements and Constraints When applicable, list other site requirements or constraints that will influence storm water management design, such as zoning requirements including setbacks and open space, or City codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements. Constraints that influenced storm water management design included the size and scale of the proposed site plan; however, site grading was done to allow drainage to resemble existing drainage patterns. 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. E-36 Page 1 of 4 Revised 02/22 Development Services Land Development Engineering 1635 Faraday Avenue 442-339-2750 www.carlsbadca.gov STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Project Information Project Name: Project ID: DWG No. or Building Permit No.: Baseline BMPs for Existing and Proposed Site Features Complete the Table 1 - Site Design Requirement to document existing and proposed site features and the BMPs to be implemented for them. All BMPs must be implemented where applicable and feasible. Applicability is generally assumed if a feature exists or is proposed. BMPs must be implemented for site design features where feasible. Leaving the box for a BMP unchecked means it will not be implemented (either partially or fully) either because it is inapplicable or infeasible. Explanations must be provided in the area below. The table provides specific instructions on when explanations are required. Table 1 - Site Design Requirement A. Existing Natural Site Features (see Fact Sheet BL-1) 1. Check the boxes below for each existing feature on the site. 1. Select the BMPs to be implemented for each identified feature. Explain why any BMP not selected is infeasible in the area below. SD-G Conserve natural features SD-H Provide buffers around waterbodies Natural waterbodies Natural storage reservoirs & drainage corridors -- Natural areas, soils, & vegetation (incl. trees) -- B. BMPs for Common Impervious Outdoor Site Features (see Fact Sheet BL-2) 1. Check the boxes below for each proposed feature. 2. Select the BMPs to be implemented for each proposed feature. If neither BMP SD-B nor SD-I is selected for a feature, explain why both BMPs are infeasible in the area below. SD-B Direct runoff to pervious areas SD-I Construct surfaces from permeable materials Minimize size of impervious areas Streets and roads Check this box to confirm that all impervious areas on the site will be minimized where feasible. If this box is not checked, identify the surfaces that cannot be minimized in area below, and explain why it is Sidewalks & walkways Parking areas & lots Driveways Patios, decks, & courtyards Hardcourt recreation areas E-36 Page 2 of 4 Revised 02/22 Other: _______________ infeasible to do so. C. BMPs for Rooftop Areas: Check this box if rooftop areas are proposed and select at least one BMP below. If no BMPs are selected, explain why they are infeasible in the area below. (see Fact Sheet BL-3) SD-B Direct runoff to pervious areas SD-C Install green roofs SD-E Install rain barrels D. BMPs for Landscaped Areas: Check this box if landscaping is proposed and select the BMP below SD-K Sustainable Landscaping If SD-K is not selected, explain why it is infeasible in the area below. (see Fact Sheet BL-4) Provide discussion/justification for site design BMPs that will not be implemented (either partially or fully): Baseline BMPs for Pollutant-generating Sources All development projects must complete Table 2 - Source Control Requirement to identify applicable requirements for documenting pollutant-generating sources/ features and source control BMPs. BMPs must be implemented for source control features where feasible. Leaving the box for a BMP unchecked means it will not be implemented (either partially or fully) either because it is inapplicable or infeasible. Explanations must be provided in the area below. The table provides specific instructions on when explanations are required. Table 2 - Source Control Requirement A. Management of Storm Water Discharges 1. Identify all proposed outdoor work areas below Check here if none are proposed 2. Which BMPs will be used to prevent materials from contacting rainfall or runoff? (See Fact Sheet BL-5) Select all feasible BMPs for each work area 3. Where will runoff from the work area be routed? (See Fact Sheet BL-6) Select one or more option for each work area SC-A Overhead covering SC-B Separation flows from adjacent areas SC-C Wind protection SC-D Sanitary sewer SC-E Containment system Other Trash & Refuse Storage Materials & Equipment Storage E-36 Page 3 of 4 Revised 02/22 Loading & Unloading Fueling Maintenance & Repair Vehicle & Equipment Cleaning Other: _________________ B. Management of Storm Water Discharges (see Fact Sheet BL-7) Select one option for each feature below: • Storm drain inlets and catch basins … are not proposed will be labeled with stenciling or signage to discourage dumping (SC-F) • Interior work surfaces, floor drains & sumps … are not proposed will not discharge directly or indirectly to the MS4 or receiving waters • Drain lines (e.g. air conditioning, boiler, etc.) … are not proposed will not discharge directly or indirectly to the MS4 or receiving waters • Fire sprinkler test water … are not proposed will not discharge directly or indirectly to the MS4 or receiving waters Provide discussion/justification for source control BMPs that will not be implemented (either partially or fully): E-36 Page 4 of 4 Revised 02/22 Form Certification This E-36 Form is intended to comply with applicable requirements of the city’s BMP Design Manual. I certify that it has been completed to the best of my ability and accurately reflects the project being proposed and the applicable BMPs proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I understand and acknowledge that the review of this form by City staff is confined to a review and does not relieve me as the person in charge of overseeing the selection and design of storm water BMPs for this project, of my responsibilities for project design. Preparer Signature: Date: Print preparer name: 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. After development of the project site plan (including size of proposed structures) in accordance with City of Carlsbad General Plan and local zoning ordinance, the structural BMP deemed most feasible for the site was a bioretention basin with infiltration (INF-2). This type of BMP was chosen due to the geotechnical determinations of infiltration, infeasibility of capture and use criteria and general site conditions. The project proposes a bioretention basin to be located onsite. Bioretention basin BMP-1 will be constructed on the eastern portion of the site at a surface elevation of 52.75 and surface area of 850 sf. The majority of the site drain into bioretention basin BMP-1 with storm water to be conveyed through both sheet flow and PVC drain-pipe methods. The site will continue to drain from west to east with all drainage via gravity flow to the basin. The bioretention basin will include a 36” x 36” and 24” x 24” brooks box outlet structure to further facilitate the conveyance of mitigated water and flows from large storm events. BMP-1 will have 7” of ponding from the basin surface to the grate inlet at the top of the brooks box, and will have an 18” layer of engineered soil and 9” gravel layer beneath. The brooks box of BMP-1 will outlet water into an 8” PVC drain-pipe which connects to 6X4” pvc pipes @ 3.0 ft O.C. that will discharge water evenly to a rip rap flow spreader device and sill along the entire eastern property line, similar to the pre-development condition. [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. BMP-1 (INF-1) DWG CT 2021-0002 / PUD 2021-0007 / CDP 2021-0038 Sheet No. 2-3 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) Dry Wells (INF-4) Partial retention by biofiltration with partial retention (PR-1) Biofiltration (BF-1) Proprietary Biofiltration (BF-3) Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below) Detention pond or vault for hydromodification management Other (describe in discussion section below) Purpose: Pollutant control only Hydromodification control only Combined pollutant control and hydromodification control Pre-treatment/forebay for another structural BMP Other (describe in discussion section below) Discussion (as needed): 850 SF bioretention basin located on the eastern portion of the site with a finished surface elevation of 52.75. The BMP will function as pollutant control and to control peak flow detention to qualify for conjunctive use. Refer to project DMA Exhibit for size of drainage area tributary to basin and cross-section of BMP. Emergency overflow structures included in BMP for higher intensity storm events to convey water offsite also provided. 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 Sequence Contents Checklist Attachment 1a DMA Exhibit (Required) See DMA Exhibit Checklist on the back of this Attachment cover sheet. (24”x36” Exhibit typically required) Included Attachment 1b 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 1a Included on DMA Exhibit in Attachment 1a Included as Attachment 1b, separate from DMA Exhibit Attachment 1c Form K-7, Harvest and Use Feasibility Screening Checklist (Required unless the entire project will use infiltration BMPs) Refer to Appendix B of the BMP Design Manual to complete Form K-7. Included Not included because the entire project will use infiltration BMPs Attachment 1d Infiltration Feasibility Analysis (Required unless the project will use harvest and use BMPs) Refer to Appendix D of the BMP Design Manual. Included Not included because the entire project will use harvest and use BMPs Attachment 1e Pollutant Control BMP Design Worksheets / Calculations (Required) Refer to Appendices B, E, and I of the BMP Design Manual for structural pollutant control and significant site design BMP design guidelines Included Attachment 1f Trash Capture BMP Design Calculations (Required unless the entire project will use permanent storm water quality basins) Refer to Appendices J of the BMP Design Manual for Trash capture BMP design guidelines Included Not included because the entire project will use permanent storm water quality basins (i.e. infiltration, biofiltration BMPs) Use this checklist to ensure the required information has been included on the DMA Exhibit: The DMA Exhibit must identify: Underlying hydrologic soil group Approximate depth to groundwater (N/A) Existing natural hydrologic features (watercourses, seeps, springs, wetlands) (N/A) 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 (DMA) boundaries, DMA ID numbers, and DMA areas (square footage or acreage), and DMA type (i.e., drains to BMP, self-retaining, or self-mitigating) Structural BMPs (identify location and type of BMP) Tabular DMA Summary DRAINAGE MANAGEMENT AREA EXHIBIT LEGEND 1.0%-2.0% 1"X4"WEIR OPENING; - A ~ ",.......L...r TW=545 -53.92100-YR 53.5 TG WSEL -36" X 36" BROOKS BOX;53.92TG rTWELE\1=54.5 3"X 15"WEIR ('-l.1=1 ==:J\ I 7'' '7 r,~-\ _-\"-o=PE=N-=-IN_G~·-· 53_.2_5_IE..t,--_J_r 1.8' 1\ 1 <1 ~IMPERMEABLE LINER j 6" • 1 Iii ALONG SIDES OF =1 ;;, \JI\JIFG=5275 3" MULCH LAYER __t::i, --+➔t:~I :;; .l ~I :::::;I:;::; 11~1 I 18"ENGINEEREDSOIL ~----t--:-tr~11111=1 ______ y;____ BMPONLY :11111 llli v1 ~~i::{°F3/B"PEA -1 11111= /v __!-9"LAYERGRAVEL LAYER; 'SEE NOTE BELOW b -, I I I ,-·, I I I I 50.0 BOTTOM OF BASIN ELEVATION; r---~ "I I I I 1·--·1 I I _.,,,.-~ I STORAGE ._.c ~0000000000000 JOOOOOOOOO-pERMfABLE GEO TEXTILE FABRIC TO , o O o O o O o O o O o O o o O o O o O o O o O o <1 i,--4• PVC PIPE AT 3' O.C. WRAP GRAVEL SYSTEM r,:,::--,--11..0;Jo1;;0.2.0 ~0 o,1;0;.i;o1;;0 .2.o 0;;,Jo,1;0;.µ __ ___j!l,.___:!1,._...Lli;;c0 o,1;0;.i;oc;;0.2.o 0;;,Jo,1;0;._goc;;,_<j01 ~ " I'-" WELEV=~U -----~,--,-~ I "'l;,L---~/:J ----------i---49.0/E RETAINING 1/111\LL PER -,t~---,-'., , , .JC>, 1.5' X 20' FLOW SPREADER smUCTURALDES/GN; ~ ' ' " . 1:t'--rs., DEVICEANDRIPRAP &~9 , I ' · . -\, '--6" X 24" RAJSED PCC SILL 'BIOFIL TRATION ''ENGINEERED SOIL" LAYER SHALL BE EVENLY MIXED COMPOSITION OF V'D\SHED SAND, SANDY LOAM TOPSOIL, AND HUM/C COMPOSI THE MIX SHALL CONTAIN 65% SAND, 20% TOPSOIL, AND 15% COMPOST OR HARDV',0OD MULCH IN ACCORDANCE WITH COUNTY OF SAN DIEGO LID BIOSV'D\LE MEDIA B/065 CUT SHEEI _p! <1 TO CONVERT RUNOFF TO SHEET FLOW 8" HOPE SOLID-1/111\LL PIPE WI 6X4-INCH PVC -------~-~ T---!==;:;,,!__ PIPESAT3'0.C. -,. ,. V WELEV=-47.1 \I r---,f--.-RETAINING 1/111\LL PER \. ~ smucTURAL DESIGN; I I TYPICAL DETAIL -BIORETENTION BASIN (INF-2) ....... 17 SEESHEET9 NOTTO SCALE J:IACTIVE JOBS'.3529 RINCON GARFIELD STICIVILIREPORTS\SWQMPIATTACHMENTSIATTACHMENT 1 -POLLUTANT CONffiOLIATT 1A_B-OMA EXHIB/IDWG 3570 GARFIELD STREET SOIL TYPE INFORMATION SOIL: TYPE B HYDROLOG/C SOILS PER WEB SOIL SURVEY APPLICATION AVAILABLE THROUGH UNITED STATES DEPARTMENT OF AGRICULTURE COARSE SEDIMENT YIELD NO CRJTICAL COARSE SEDIMENT YIELD AREAS TO BE PROTECTED. REFER TO PRIORITY DEVELOPMENT PROJECT SWQMP PREPARED BY PASCO, LARET, SUITER & ASSOCIATES GROUNDWATERINFORMATTON GROUNDWATER NOT ENCOUNTERED; ASSUMED TO BE AT DEPTHS GREATER THAN 20' TREATMENTCONTROLBMPS BIORETENTION WI INFILTRATION INF-2 OMA 1 -AREA CALCULATIONS IMPERVIOUS AREA PERV/OUS AREA TOTAL BASIN AREA % IMPERVIOUS AREA (BUILDINGS I ROOF) (PARKING HARDSCAPE) (DRMNG HARDSCAPE) (W41.KJNG HARDSCAPE) TOTAL (LANDSCAPING) (BIORETENTION BASIN) TOTAL 24,705 SF 74.4% 12,232SF 796SF 4,500SF 842SF 18,370 Sf 5,485SF 860 SF 6,335 Sf DCV CALCULATION -OMA 1 AREA ffilBUTARY TO BMP (A) TOTAL OMA SIZE (Cx 'Ax) RUNOFF FACTOR (CX) 85TH PERCENTILE RAINFALL DEPTH (d) DCV (C'D'A '3,630) = = = = = 24,705 SF (0.567 AC) 18,434 SF 0.75 0.58 IN 896CUFT I \ POC 1 ) APN: I 204-240-06-00 '----- ·y PROPERTY BOUNDARY CENTERLINE OF ROAD RIGHT-OF-WAY ADJACENT PROPERTY LINE EXJSTING CONTOUR LINE PROPOSED CONTOUR LINE OMA DRAJNAGE BASIN BOUNDARY PROPOSED I REMOVED AND REPLACED IMPERVIOUS AREA WITHIN DISTURBED AREA OF SITE BMP I BIOFILTRATION BASIN AREA SELF-MITIGATING AREA DE MIN/MIS AREA BMPLEGEND POST-CONSTRUCTION SITE DESIGN BMPs ! SD-1 ! MAINTAIN NATURAL DRAINAGE PATHWAYS AND HYDROLOG/C FEATURES ! SD-3 ! MINIMIZE IMPERVIOUS AREA SOURCE CONTROL BMPs -------- ----£56 ----256 ---- VZZ7ZZZZZZZJ 1+++++++++++++++++++~ +++++++++++++++++++ t,), ),),),),),),),),),),), ),J D66666666l @ 24,911 SF (0.572AC) 5,187 SF(0.119AC) 19,724 SF (0.453AC) 24,911 SF (0.572AC) 18,370 SF (0.422 AC) ! SD-5 ! IMPERVIOUS AREA DISPERSION ! SD-7 ! LANDSCAPING WITH NATIVE OR DROUGHT TOLERANT SPECIES I SD-K I SUSTAINABLE LANDCAPING SC-1 SC-2 SC-3 SC-4 SC-5 SC-6 PREVENTION OF /WCIT DISCHARGES INTO THE MS4 STORM DRAJN STENCILING AND POSTING OF S/GNAGE PROTECTED OUTDOOR MATERIALS STORAGE AREAS PROTECT MATERIALS STORED IN OUTDOOR I-IORK AREAS PROTECT TRASH STORAGE AREAS APPLIED YES YES NIA NIA NIA ADDITIONAL BMPs BASED ON POTENTIAL RUNOFF POLLUTANTS: [Kl ONSITE STORM DRAIN INLET I]] INTERIOR FLOOR DRAJNS & ELEVATOR SHAFT SUMPS [TI INTERIOR PARKING GARAGES ---------@] NEED FOR FUTURE INDOOR & STR. PEST CONffiOL [I] LANDSCAPE I OUTDOOR PESTICIDE USE YES NIA NIA YES YES NIA NIA NIA NIA NIA NIA NIA NIA NIA NIA YES YES OMA UNIQUE IDENTIFIER 1 2 10 AREA (SF) 24705 206 GRAPHIC SCALE: 0 10 TABULAR SUMMARY OF DMAs IMPERVIOUS AREA (SF) 18370 0 %/MP 74.4 0 OMA TABLE -TREATMENT (OMA 1) 20 HSG B B 30 II] POOLS, SPAS, PONDS, FOUNTAIN, & WATER FEATURES (]] FOOD SERVICE H IRASH OR REFUSE AREAS [I] INDUSffilAL PROCESSES QJ OUTDOOR STORAGE OF EQUIP. OR MATERIALS IBJ VEHICLE AND EQUIPMENT CLEANING [iJ VEHICLE I EQUIPMENT REPAIR AND MAINTENANCE l::M] FUEL DISPENSINGAREAS (]] LOADING DOCKS @] FIRE SPRINKLER TEST WATER [El MISCELLANEOUS DRAIN OR WASH WATER @] PLAZAS, SIDEWALKS, DRIVEWAYS, AND PARKING LOTS WORKSHEET B-1 AREA WEIGHTED RUNOFF COEFFICIENT DCV (CUBIC FEET) TREATED BY (BMP ID) POLLUTANT CONTROL TYPE 0.75 896 1.0 BIOFIL TRA T/ON 0.30 SELF-MITIGATING SELF-MITIGATING DRAINS TO (POC ID) 1 1 AREAX SELF-MITIGATING OMA -OMA 2 OMA/ BMP AREA (SF) POST-PROJECT SURFACE TYPE SURFACE RUNOFF ADJUSTMENT ADJUSTED FACTOR FACTOR RUNOFF TOTAL BASIN SIZE = 206 SF (0.005AC) 0SF 1A 12232 ROOF 1B 796 PRK HAROSCAPE 1C 4500 DRIVING HAROSCAPE 10 842 WALKING HAROSCAPE 1E 5485 LANDSCAPE 1 850 BMP TOTAL AREA ffilBUTARY TO BMP (A) TOTAL OMA SIZE = = 24,705 SF 18,434 SF 0.9 0.9 0.9 0.9 0.3 0.3 IMP. SIZING FACTOR MIN. AREA REQUIRED = = 0.03 (FOR BIOFILTRATION BMPS) 0.03 '18,434 SF= 553 SF 860 SF PROVIDED> 553 SF REQUIRED; THEREFORE OK (SF) 1 11009 1 716 1 4050 1 758 1 1646 1 255 18434 SELF-MITIGATING IMPERVIOUS AREA = % IMPERVIOUS = 0.0% SECTTON 5.2. 1 OF THE CITY OF CARLSBAD BMP DESIGN MANUAL ALLOWS FOR SELF-MITIGATING DMAAREAS THAT DRAIN DIRECT!_ Y OFFS/TE OR TO THE PUBLIC STORM DRAIN SYSTEM, WITH INCIDENTAL IMPERVIOUS AREAS THAT ARE LESS THAN 5% OF THE SELF-MITIGATING AREA OMA EXHIBIT - ATTACHMENT 1A B 3570 GARFIELD STREET -CITY OF CARLSBAD PASCO LAREY SUITER ~ A~~©t!AllE~ San Diego I Solana Beach I Orange County Phone 858.259.8212 I www.plsaengineering.com PLSA 3529-01 Appendix K: Forms and Checklists K-2 Sept. 2021 Harvest and Use Feasibility Checklist Form K-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. [Provide a summary of calculations here] 3. Calculate the DCV using worksheet B-2.1. DCV = __________ (cubic feet) 3a. Is the 36 hour demand greater than or equal to the DCV? Yes / No 3b. Is the 36 hour demand greater than 0.25DCV but less than the full DCV? Yes / No 3c. Is the 36 hour demand less than 0.25DCV? Yes 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. 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. Harvest and use is considered to be infeasible. Is harvest and use feasible based on further evaluation? Yes, refer to Appendix E to select and size harvest and use BMPs. No, select alternate BMPs. Note: 36-hour demand calculations are for feasibility analysis only. Once feasibility analysis is complete the applicant may be allowed to use a different drawdown time provided they meet the 80% annual capture standard (refer to B.4.2) and 96-hour vector control drawdown requirement. Categorization of Infiltration Feasibility Form I-8 Condition 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 Appendi." D. Yes No X Provide basis: Two infiltration tests using the Double Ring lnfiltrometer test method were performed in the weathered paralic deposits. The test results were 1.80 inch/hr and 2.79 inch/hr (without considering safety factors). See "Geothechnical Investigation and Infiltration Testing ... ", by Hetherington Engineering, Inc., dated July 14, 2021. Summarize findings of studies; provide reference to srudies, calculations, maps, data sources, etc. Provide narrative discussion of study/ data source applicabili t:y. 2 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 Appendix C.2. X Provide basis: On-site infiltration is considered acceptable from a geotechnical standpoint provided that the geotechnical recommendations included in the "Geotechnical Investigation ... " are implemented during design and construction. Summarize findings of srudies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/ data source applicability. Criteri a 3 Form I-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 Appencli., C.3. Yes No X Provide basis: On-site storm water pollutant concerns are unknown at this time. The test pits at the site with a maximum depth of 13.5-feet did not encounter groundwater. Infiltrated water will migrate at least X-feet before reaching groundwater. In addition, we are not aware of any known soil contamination present. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/ data source applicability. 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 Appendix C.3. X Provide basis: No ephemeral streams are present at the site. Groundwater was not encountered to a depth of at least 13.5-feet and we are not aware of any contaminated groundwater in t11e site vicinity. 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 Full Infiltration *To be con1p1eted using gathered site infom1at1on and best professional judgment cons1denng the definition of NIEP 111 the £1'1S4 Permit. Additional testing and/or studies may be required by the City to substantiate findings. Appendix I: Forms and Checklists I-5 February 2016 Form I-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 5 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: 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 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. Provide basis: 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. Appendix I: Forms and Checklists I-6 February 2016 Form I-8 Page 4 of 4 Criteria Screening Question Yes No 7 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. Provide basis: 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 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. Provide basis: 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. Part 2 Result* If all answers from row 5-8 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. *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. Factor of Safety and Design Infiltration Rate Worksheet Form I-9 Factor Category Factor Description Assigned Weight (w) Factor Value (v) Product (p) p = w x v A Suitability Assessment Soil assessment methods 0.25 Predominant soil texture 0.25 Site soil variability 0.25 Depth to groundwater / impervious layer 0.25 Suitability Assessment Safety Factor, SA = p B Design Level of pretreatment/ expected sediment loads 0.5 Redundancy/resiliency 0.25 Compaction during construction 0.25 Design Safety Factor, SB = p Combined Safety Factor, Stotal= SA x SB Observed Infiltration Rate, inch/hr, Kobserved (corrected for test-specific bias) Design Infiltration Rate, in/hr, Kdesign = Kobserved / Stotal Supporting Data Briefly describe infiltration test and provide reference to test forms: Category # Description i ii iii iv v vi vii viii ix x Units 1 Drainage Basin ID or Name BMP 1 unitless 2 85th Percentile 24-hr Storm Depth 0.58 inches 3 Impervious Surfaces Not Directed to Dispersion Area (C=0.90) 18,370 sq-ft 4 Semi-Pervious Surfaces Not Serving as Dispersion Area (C=0.30) 6,335 sq-ft 5 Engineered Pervious Surfaces Not Serving as Dispersion Area (C=0.10)sq-ft 6 Natural Type A Soil Not Serving as Dispersion Area (C=0.10)sq-ft 7 Natural Type B Soil Not Serving as Dispersion Area (C=0.14)sq-ft 8 Natural Type C Soil Not Serving as Dispersion Area (C=0.23)sq-ft 9 Natural Type D Soil Not Serving as Dispersion Area (C=0.30)sq-ft 10 Does Tributary Incorporate Dispersion, Tree Wells, and/or Rain Barrels? No No No No No No No No No No yes/no 11 Impervious Surfaces Directed to Dispersion Area per SD-B (Ci=0.90) sq-ft 12 Semi-Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.30)sq-ft 13 Engineered Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.10)sq-ft 14 Natural Type A Soil Serving as Dispersion Area per SD-B (Ci=0.10)sq-ft 15 Natural Type B Soil Serving as Dispersion Area per SD-B (Ci=0.14)sq-ft 16 Natural Type C Soil Serving as Dispersion Area per SD-B (Ci=0.23)sq-ft 17 Natural Type D Soil Serving as Dispersion Area per SD-B (Ci=0.30)sq-ft 18 Number of Tree Wells Proposed per SD-A # 19 Average Mature Tree Canopy Diameter ft 20 Number of Rain Barrels Proposed per SD-E # 21 Average Rain Barrel Size gal 22 Total Tributary Area 24,705 0 0 0 0 0 0 0 0 0 sq-ft 23 Initial Runoff Factor for Standard Drainage Areas 0.75 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 24 Initial Runoff Factor for Dispersed & Dispersion Areas 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 25 Initial Weighted Runoff Factor 0.75 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 26 Initial Design Capture Volume 896 0 0 0 0 0 0 0 0 0 cubic-feet 27 Total Impervious Area Dispersed to Pervious Surface 0 0 0 0 0 0 0 0 0 0 sq-ft 28 Total Pervious Dispersion Area 0 0 0 0 0 0 0 0 0 0 sq-ft 29 Ratio of Dispersed Impervious Area to Pervious Dispersion Area n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a ratio 30 Adjustment Factor for Dispersed & Dispersion Areas 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 ratio 31 Runoff Factor After Dispersion Techniques 0.75 n/a n/a n/a n/a n/a n/a n/a n/a n/a unitless 32 Design Capture Volume After Dispersion Techniques 896 0 0 0 0 0 0 0 0 0 cubic-feet 33 Total Tree Well Volume Reduction 0 0 0 0 0 0 0 0 0 0 cubic-feet 34 Total Rain Barrel Volume Reduction 0 0 0 0 0 0 0 0 0 0 cubic-feet 35 Final Adjusted Runoff Factor 0.75 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 36 Final Effective Tributary Area 18,529 0 0 0 0 0 0 0 0 0 sq-ft 37 Initial Design Capture Volume Retained by Site Design Elements 0 0 0 0 0 0 0 0 0 0 cubic-feet 38 Final Design Capture Volume Tributary to BMP 896 0 0 0 0 0 0 0 0 0 cubic-feet False False Automated Worksheet B.1: Calculation of Design Capture Volume (V2.0) Dispersion Area, Tree Well & Rain Barrel Inputs (Optional) Standard Drainage Basin Inputs Results Tree & Barrel Adjustments Initial Runoff Factor Calculation Dispersion Area Adjustments No Warning Messages Category # Description i ii iii iv v vi vii viii ix x Units 1 Drainage Basin ID or Name BMP 1 - - - - - - - - - unitless 2 85th Percentile Rainfall Depth 0.58 - - - - - - - - - inches 3 Predominant NRCS Soil Type Within BMP Location B unitless 4 Is proposed BMP location Restricted or Unrestricted for Infiltration Activities? Unrestricted unitless 5 Nature of Restriction n/a unitless 6 Do Minimum Retention Requirements Apply to this Project? Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes yes/no 7 Are Habitable Structures Greater than 9 Stories Proposed? No yes/no 8 Has Geotechnical Engineer Performed an Infiltration Analysis? Yes yes/no 9 Design Infiltration Rate Recommended by Geotechnical Engineer 1.200 in/hr 10 Design Infiltration Rate Used To Determine Retention Requirements 1.200 - - - - - - - - - in/hr 11 Percent of Average Annual Runoff that Must be Retained within DMA 80.0% - - - - - - - - - percentage 12 Fraction of DCV Requiring Retention 0.99 - - - - - - - - - ratio 13 Required Retention Volume 887 - - - - - - - - - cubic-feet False False Automated Worksheet B.2: Retention Requirements (V2.0) Advanced Analysis Basic Analysis Result No Warning Messages Category #Description i ii iii iv v vi vii viii ix x Units 1 Drainage Basin ID or Name BMP 1 ---------sq-ft 2 Design Infiltration Rate Recommended 1.200 ---------in/hr 3 Design Capture Volume Tributary to BMP 896 ---------cubic-feet 4 Is BMP Vegetated or Unvegetated?Vegetated unitless 5 Is BMP Impermeably Lined or Unlined?Unlined unitless 6 Does BMP Have an Underdrain?No Underdrain unitless 7 Does BMP Utilize Standard or Specialized Media?Standard unitless 8 Provided Surface Area 850 sq-ft 9 Provided Surface Ponding Depth 6 inches 10 Provided Soil Media Thickness 18 inches 11 Provided Gravel Thickness (Total Thickness)9 inches 12 Underdrain Offset 3 inches 13 Diameter of Underdrain or Hydromod Orifice (Select Smallest)4.00 inches 14 Specialized Soil Media Filtration Rate in/hr 15 Specialized Soil Media Pore Space for Retention unitless 16 Specialized Soil Media Pore Space for Biofiltration unitless 17 Specialized Gravel Media Pore Space unitless 18 Volume Infiltrated Over 6 Hour Storm 510 0 0 0 0 0 0 0 0 0 cubic-feet 19 Ponding Pore Space Available for Retention 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 unitless 20 Soil Media Pore Space Available for Retention 0.25 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 unitless 21 Gravel Pore Space Available for Retention (Above Underdrain)0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 unitless 22 Gravel Pore Space Available for Retention (Below Underdrain)0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 unitless 23 Effective Retention Depth 14.10 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 inches 24 Fraction of DCV Retained (Independent of Drawdown Time)1.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ratio 25 Calculated Retention Storage Drawdown Time 12 0 0 0 0 0 0 0 0 0 hours 26 Efficacy of Retention Processes 1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ratio 27 Volume Retained by BMP (Considering Drawdown Time)896 0 0 0 0 0 0 0 0 0 cubic-feet 28 Design Capture Volume Remaining for Biofiltration 0 0 0 0 0 0 0 0 0 0 cubic-feet 29 Max Hydromod Flow Rate through Underdrain 0.6418 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 cfs 30 Max Soil Filtration Rate Allowed by Underdrain Orifice 32.62 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 in/hr 31 Soil Media Filtration Rate per Specifications 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 in/hr 32 Soil Media Filtration Rate to be used for Sizing 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 in/hr 33 Depth Biofiltered Over 6 Hour Storm 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 inches 34 Ponding Pore Space Available for Biofiltration 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless 35 Soil Media Pore Space Available for Biofiltration 0.00 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 unitless 36 Gravel Pore Space Available for Biofiltration (Above Underdrain)0.00 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 unitless 37 Effective Depth of Biofiltration Storage 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 inches 38 Drawdown Time for Surface Ponding 5 0 0 0 0 0 0 0 0 0 hours 39 Drawdown Time for Effective Biofiltration Depth 0 0 0 0 0 0 0 0 0 0 hours 40 Total Depth Biofiltered 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 inches 41 Option 1 - Biofilter 1.50 DCV: Target Volume 0 0 0 0 0 0 0 0 0 0 cubic-feet 42 Option 1 - Provided Biofiltration Volume 0 0 0 0 0 0 0 0 0 0 cubic-feet 43 Option 2 - Store 0.75 DCV: Target Volume 0 0 0 0 0 0 0 0 0 0 cubic-feet 44 Option 2 - Provided Storage Volume 0 0 0 0 0 0 0 0 0 0 cubic-feet 45 Portion of Biofiltration Performance Standard Satisfied 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ratio 46 Do Site Design Elements and BMPs Satisfy Annual Retention Requirements?Yes ---------yes/no 47 Overall Portion of Performance Standard Satisfied (BMP Efficacy Factor)1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ratio 48 Deficit of Effectively Treated Stormwater 0 n/a n/a n/a n/a n/a n/a n/a n/a n/a cubic-feet Biofiltration Calculations False False False False Result False False No Warning Messages Retention Calculations Automated Worksheet B.3: BMP Performance (V2.0) False False BMP Inputs 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 Sequence Contents Checklist Attachment 2a Hydromodification Management Exhibit (Required) Included See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. Attachment 2b Management of Critical Coarse Sediment Yield Areas (WMAA Exhibit is required, additional analyses are optional) See Section 6.2 of the BMP Design Manual. Exhibit showing project drainage boundaries marked on WMAA Critical Coarse Sediment Yield Area Map (Required) Optional analyses for Critical Coarse Sediment Yield Area Determination Appendix H.6.1 Verification of Geomorphic Landscape Units Onsite Appendix H.7 Downstream Systems Sensitivity to Coarse Sediment Attachment 2c Geomorphic Assessment of Receiving Channels (Optional) See Section 6.3.4 of the BMP Design Manual. Not performed Included Attachment 2d Flow Control Facility Design and Structural BMP Drawdown Calculations (Required) See Chapter 6 and Appendix G of the BMP Design Manual Included Use this checklist to ensure the required information has been included on the Hydromodification Management Exhibit: The Hydromodification Management Exhibit must identify: Underlying hydrologic soil group Approximate depth to groundwater Existing natural hydrologic features (watercourses, seeps, springs, wetlands) Critical coarse sediment yield areas to be protected (if present) Existing topography Existing and proposed site drainage network and connections to drainage offsite Proposed grading Proposed impervious features Proposed design features and surface treatments used to minimize imperviousness Point(s) of Compliance (POC) for Hydromodification Management Existing and proposed drainage boundary and drainage area to each POC (when necessary, create separate exhibits for pre-development and post-project conditions) Structural BMPs for hydromodification management (identify location, type of BMP, and size/detail) ArcGIS . . ,:;; k0 , ·.::J. r'i ...,): ;:_,...._,; i"~h ¾,.,i ;I ea~~tH5: ·;.,...,'1 • J:11\CTI\IE JOBS\3529 RINCON GARFIELD STTCIVIL IR£PORTSISVVQMPII\TTACHM£NTSII\TTACHM£NT 2 -HMPII\TT_ 1A -HMP £XHIBIIDWG HYDROMODIFICATION EXEMPTION EXHIBIT RUNOFF LJJEA\lE.S SITE ENTERS EX!·ST!NG STORM DRAIN SVSTE~J PROJECT Sl'TE 3570 GARFIELD STREET PLAN VIEW -HMP EXEMPTION EXHIBIT SCALE: 1" = 10' HORIZONTAL RUNOFF E,NTER,S. AGUA HEO:IONOA, LAGOC1N, UlTl,MATEl V OLJTLETS TQ, PACIFIC OCE.AN' f.,"'ili ·]:ftf Ci , ... , ~ HMP EXEMPTION EXHIBIT 3570 GARFIELD STREET CITY OF CARLSBAD PASCO LARET SUITER I& #\~~©<C!A'ii'[[~ San Diego Solana Beach I Orange County Phone 858.259.8212 I www.plsaengineering.com PLSA 3529-01 POTENTIAL CCSYA EXHIBIT PASCO LARET SUITER 3570 GARFIELD STREET 1----• & ASSOCIATES CARLSBAD, CA CIVIL ENGINEERING + LAND PLANNING + LAND SURVEYING PROJECT NUMBER: PLSA 3570 535 North Highway 101, Ste A, Solana Beach, CA 92075 SCALE: NTS ph 858.259.8212 I & 858.259.4812 I pl■aengineering.com DATE: JULY 19, 2021 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: 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) How to access the structural BMP(s) to inspect and perform maintenance Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, 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 Maintenance thresholds for BMPs subject to siltation or heavy trash(e.g., silt level posts or other markings shall be included in all BMP components that will trap and store sediment, trash, and/or debris, so that the inspector may determine how full the BMP is, and the maintenance personnel may determine where the bottom of the BMP is . If required, posts or other markings shall be indicated and described on structural BMP plans.) Recommended equipment to perform maintenance When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management BMP DESCRIPTION BIORETENTION (850 SF TOTAL) ATTACHMENT -3a BMP MAINTENANCE THRESHOLDS STORM WATER MANAGEMENT AND DISCHARGE CONTROL MAINTENANCE AGREEMENT APPROVAL NO: O&M RESPONSIBLE PARTY DESIGNEE: GARFIELD STREET RESIDENCES HOA POS~CONSTRUCTTONPERMANENTBMP OPERATION & MAINTENANCE PROCEDURE DETAILS MAINTENANCE INDICATORS MAINTENANCE ACTION ACCUMULATION OF SEDIMENT, LITTER, OR DEBRIS REMOVE AND PROPERLY DISPOSE OF ACCUMULATED MATERIALS, WITHOUT DAMAGE TO THE VEGETATION POOR VEGETATION ESTABLISHMENT OVERGROWN VEGETATION EROSION DUE TO CONCENTRATED IRRIGATION FLOW EROSION DUE TO CONCENTRATED STORM WATER RUNOFF FLOW STANDING WATER IN BIORETENTIONAREAS OBSTRUCTED INLET OR OUTLET STRUCTURE DAMAGE TO INLET OR OUTLET STRUCTURE MAINTENANCE EQUIPMENT AND ACCESS USE LANDSCAPE EQUIPMENT FOR MAINTENANCE; ACCESS BMPS FROM PRIVATE DRIVEWAY OFF GARFIELD STREET TOWARDS EASTERN PORTION OF SITE INSPECTION FACILITATION INSTALL 36" X 36"AND 24" X 24" OUTLET RISER STRUCTURES TO SERVE AS CLEANOUT AND PROVIDE OBSERVATION ACCESS FOR INSPECTION OF MAINTENANCE THRESHOLDS; MARKING TO BE PROVIDED ON BMP COMPONENTS TO DETERMINE HOW FULL BMP IS. RE-SEED, RE-PLANT, OR RE-ESTABLISH VEGETATION PER ORIGINAL PLANS MOW OR TRIM AS APPROPRIATE, BUT NOT LESS THAT THE DESIGN HEIGHT OF THE VEGETATION PER ORIGINAL PLANS. REPAIR/RE-SEED/RE-PLANT ERODED AREAS AND ADJUST THE IRRIGATION SYSTEM REPAIR/RE-SEED/RE-PLANT ERODED AREAS AND MAKE APPROPRIATE CORRECTIVE MEASURES SUCH AS ADDING STONE AT FLOW ENTRY POINTS OR MINOR RE-GRADING TO RESTORE PROPER DRAINAGE ACCORDING TO THE ORIGINAL PLAN. MAKE APPROPRIATE CORRECTIVE MEASURES SUCH AS ADJUSTING IRRIGATION SYSTEM, REMOVING OBSTRUCTION OF DEBRIS OR INVASIVE VEGETATION, OR CLEANING UNDERDRAINS CLEAR OBSTRUCTIONS REPAIR OR REPLACE AS APPLICABLE MAINTENANCE FREQUENCY BIORETENTION BMP TO BE MAINTAINED ANNUALLY & AS-NEEDED PASCO LARET SUITER & A880CIATE8 CIVIL EHINEERINI + LAND PLANNINI + LAND aJRVEYINI lllllartla BlplMJIDI. Ill.A. 8alaaBIICII.CAat75 p1aUU1t.a121 &UUSM1121,..........._ BMP DESCRIPTION TRASH CAPTURE BMP FROG CREEK MUN DUS BAG TTC I TRASH CAPTURE BMP STORMTEK PIPE SCREEN CONNECTOR ST3 ATTACHMENT -3a BMP MAINTENANCE THRESHOLDS STORM WATER MANAGEMENT AND DISCHARGE CONTROL MAINTENANCE AGREEMENT APPROVAL NO: O&M RESPONSIBLE PARTY DESIGNEE: GARFIELD STREET RESIDENCES HOA POS~CONSTRUCTTONPERMANENTBMP OPERATION & MAINTENANCE PROCEDURE DETAILS MAINTENANCE INDICATORS MAINTENANCE ACTION ACCUMULATION OF SEDIMENT, LITTER, OR DEBRIS REMOVE AND PROPERLY DISPOSE OF ACCUMULATED MATERIALS, WITHOUT DAMAGE TO THE VEGETATION OBSTRUCTED INLET OR OUTLET STRUCTURE DAMAGE TO INLET OR OUTLET STRUCTURE CLOGGED FILTER MEDIA MAINTENANCE EQUIPMENT AND ACCESS USE LANDSCAPE EQUIPMENT FOR MAINTENANCE; ACCESS BMPS FROM PRIVATE DRIVEWAY OFF GARFIELD STREET TOWARDS EASTERN PORTION OF SITE CLEAR OBSTRUCTIONS REPAIR OR REPLACE AS APPLICABLE REMOVE AND PROPERLY DISPOSE FILTER MEDIA, AND REPLACE WITH FRESH MEDIA MAINTENANCE FREQUENCY BIOFILTRATION BMP TO BE MAINTAINED ANNUALLY &AS-NEEDED PASCO LARET SUITER & A880CIATE8 CIVIL EHINEERINI + LAND PLANNINI + LAND aJRVEYINI lllllartla BlplMJIDI. Ill.A. 8alaaBIICII.CAat75 p1aUU1t.a121 &UUSM1121,..........._ INF-2 Bioretention BMP MAINTENANCE FACT SHEET FOR STRUCTURAL BMP INF-2 BIORETENTION Bioretention (bioretention without underdrain) facilities are vegetated surface water systems that filter water through vegetation and soil, or engineered media prior to infiltrating into native soils. Bioretention facilities are designed to infiltrate the full design capture volume (DCV) into native soils. They have no underdrain, and no impermeable liner. Typical bioretention components include: • Inflow distribution mechanisms (e.g., perimeter flow spreader or filter strips) • Energy dissipation mechanism for concentrated inflows (e.g., splash blocks or riprap) • Shallow surface ponding for captured flows • Side slope and basin bottom vegetation selected based on climate and ponding depth • Non-floating mulch layer • Media layer (planting mix or engineered media) capable of supporting vegetation growth • Filter course layer consisting of aggregate to prevent the migration of fines into uncompacted native soils or the optional aggregate storage layer • Optional aggregate storage layer for additional infiltration storage • Uncompacted native soils at the bottom of the facility • Overflow structure Normal Expected Maintenance Bioretention requires routine maintenance to: remove accumulated materials such as sediment, trash or debris; maintain vegetation health; maintain infiltration capacity of the media layer; replenish mulch; and maintain integrity of side slopes, inlets, energy dissipators, and outlets. A summary table of standard inspection and maintenance indicators is provided within this Fact Sheet. Non-Standard Maintenance or BMP Failure If any of the following scenarios are observed, the BMP is not performing as intended to protect downstream waterways from pollution and/or erosion. Corrective maintenance, increased inspection and maintenance, BMP replacement, or a different BMP type will be required. • The BMP is not drained between storm events. Surface ponding longer than approximately 24 hours following a storm event may be detrimental to vegetation health, and surface ponding longer than approximately 96 hours following a storm event poses a risk of vector (mosquito) breeding. Poor drainage can result from clogging of the media layer, filter course, aggregate storage layer, underlying native soils, or outlet structure. The specific cause of the drainage issue must be determined and corrected. If it is determined that the underlying native soils have been compacted or do not have the infiltration capacity expected, the [City Engineer] shall be contacted prior to any additional repairs or reconstruction. • Sediment, trash, or debris accumulation greater than 25% of the surface ponding volume within one month. This means the load from the tributary drainage area is too high, reducing BMP function or clogging the BMP. This would require pretreatment measures within the tributary area draining to the BMP to intercept the materials. Pretreatment components, especially for sediment, will extend the life of components that are more expensive to replace such as media, filter course, and aggregate layers. INF-2 Page 1 of 11 January 12, 2017 INF-2 Bioretention • Erosion due to concentrated storm water runoff flow that is not readily corrected by 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 Engineer] shall be contacted prior to any additional repairs or reconstruction. Other Special Considerations Bioretention is a vegetated structural BMP. Vegetated structural BMPs that are constructed in the vicinity of, or connected to, an existing jurisdictional water or wetland could inadvertently result in creation of expanded waters or wetlands. As such, vegetated structural BMPs have the potential to come under the jurisdiction of the United States Army Corps of Engineers, SDRWQCB, California Department of Fish and Wildlife, or the United States Fish and Wildlife Service. This could result in the need for specific resource agency permits and costly mitigation to perform maintenance of the structural BMP. Along with proper placement of a structural BMP, routine maintenance is key to preventing this scenario. INF-2 Page 2 of 11 January 12, 2017 INF-2 Bioretention SUMMARY OF STANDARD INSPECTION AND MAINTENANCE FOR INF-2 BIORETENTION The property owner is responsible to ensure inspection, operation and maintenance of permanent BMPs on their property unless responsibility has been formally transferred to an agency, community facilities district, homeowners association, property owners association, or other special district. Maintenance frequencies listed in this table are average/typical frequencies. Actual maintenance needs are site-specific, and maintenance may be required more frequently. Maintenance must be performed whenever needed, based on maintenance indicators presented in this table. The BMP owner is responsible for conducting regular inspections to see when maintenance is needed based on the maintenance indicators. During the first year of operation of a structural BMP, inspection is recommended at least once prior to August 31 and then monthly from September through May. Inspection during a storm event is also recommended. After the initial period of frequent inspections, the minimum inspection and maintenance frequency can be determined based on the results of the first year inspections. Threshold/Indicator Maintenance Action Typical Maintenance Frequency Accumulation of sediment, litter, or debris Remove and properly dispose of accumulated materials, without damage to the vegetation or compaction of the media layer. • Inspect monthly. If the BMP is 25% full* or more in one month, increase inspection frequency to monthly plus after every 0.1-inch or larger storm event. • Remove any accumulated materials found at each inspection. Obstructed inlet or outlet structure Clear blockage. • Inspect monthly and after every 0.5-inch or larger storm event. • Remove any accumulated materials found at each inspection. Damage to structural components such as weirs, inlet or outlet structures Repair or replace as applicable. • Inspect annually. • Maintenance when needed. Poor vegetation establishment Re-seed, re-plant, or re-establish vegetation per original plans. • Inspect monthly. • Maintenance when needed. Dead or diseased vegetation Remove dead or diseased vegetation, re-seed, re-plant, or re-establish vegetation per original plans. • Inspect monthly. • Maintenance when needed. Overgrown vegetation Mow or trim as appropriate. • Inspect monthly. • Maintenance when needed. 2/3 of mulch has decomposed, or mulch has been removed Remove decomposed fraction and top off with fresh mulch to a total depth of 3 inches. • Inspect monthly. • Replenish mulch annually, or more frequently when needed based on inspection. *“25% full” is defined as ¼ of the depth from the design bottom elevation to the crest of the outflow structure (e.g., if the height to the outflow opening is 12 inches from the bottom elevation, then the materials must be removed when there is 3 inches of accumulation – this should be marked on the outflow structure). INF-2 Page 3 of 11 January 12, 2017 INF-2 Bioretention SUMMARY OF STANDARD INSPECTION AND MAINTENANCE FOR INF-2 BIORETENTION (Continued from previous page) Threshold/Indicator Maintenance Action Typical Maintenance Frequency Erosion due to concentrated irrigation flow Repair/re-seed/re-plant eroded areas and adjust the irrigation system. • Inspect monthly. • Maintenance when needed. Erosion due to concentrated storm water runoff flow Repair/re-seed/re-plant eroded areas, and make appropriate 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 Engineer] shall be contacted prior to any additional repairs or reconstruction. • Inspect after every 0.5-inch or larger storm event. If erosion due to storm water flow has been observed, increase inspection frequency to after every 0.1-inch or larger storm event. • Maintenance when needed. If the issue is not corrected by restoring the BMP to the original plan and grade, the [City Engineer] shall be contacted prior to any additional repairs or reconstruction. Standing water in BMP for longer than 24 hours following a storm event Surface ponding longer than approximately 24 hours following a storm event may be detrimental to vegetation health Make appropriate corrective measures such as adjusting irrigation system, removing obstructions of debris or invasive vegetation, or repairing/replacing clogged or compacted soils. If it is determined that the underlying native soils have been compacted or do not have the infiltration capacity expected, the [City Engineer] shall be contacted prior to any additional repairs or reconstruction. • Inspect monthly and after every 0.5-inch or larger storm event. If standing water is observed, increase inspection frequency to after every 0.1-inch or larger storm event. • Maintenance when needed. Presence of mosquitos/larvae For images of egg rafts, larva, pupa, and adult mosquitos, see http://www.mosquito.org/biology If mosquitos/larvae are observed: first, immediately remove any standing water by dispersing to nearby landscaping; second, make corrective measures as applicable to restore BMP drainage to prevent standing water. If mosquitos persist following corrective measures to remove standing water, or if the BMP design does not meet the 96-hour drawdown criteria because the underlying native soils have been compacted or do not have the infiltration capacity expected, the [City Engineer] shall be contacted to determine a solution. A different BMP type, or a Vector Management Plan prepared with concurrence from the County of San Diego Department of Environmental Health, may be required. • Inspect monthly and after every 0.5-inch or larger storm event. If mosquitos are observed, increase inspection frequency to after every 0.1-inch or larger storm event. • Maintenance when needed. INF-2 Page 4 of 11 January 12, 2017 INF-2 Bioretention References American Mosquito Control Association. http://www.mosquito.org/ California Storm Water Quality Association (CASQA). 2003. Municipal BMP Handbook. https://www.casqa.org/resources/bmp-handbooks/municipal-bmp-handbook County of San Diego. 2014. Low Impact Development Handbook. http://www.sandiegocounty.gov/content/sdc/dpw/watersheds/susmp/lid.html San Diego County Copermittees. 2016. Model BMP Design Manual, Appendix E, Fact Sheet INF-2. http://www.projectcleanwater.org/index.php?option=com_content&view=article&id=250&Itemid=220 INF-2 Page 5 of 11 January 12, 2017 INF-2 Bioretention Page Intentionally Blank for Double-Sided Printing INF-2 Page 6 of 11 January 12, 2017 INF-2 Bioretention Date: Inspector: BMP ID No.: Permit No.: APN(s): Property / Development Name: Responsible Party Name and Phone Number: Property Address of BMP: Responsible Party Address: INSPECTION AND MAINTENANCE CHECKLIST FOR INF-2 BIORETENTION PAGE 1 of 5 Threshold/Indicator Maintenance Recommendation Date Description of Maintenance Conducted Accumulation of sediment, litter, or debris Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Remove and properly dispose of accumulated materials, without damage to the vegetation ☐ If sediment, litter, or debris accumulation exceeds 25% of the surface ponding volume within one month (25% full*), add a forebay or other pre-treatment measures within the tributary area draining to the BMP to intercept the materials. ☐ Other / Comments: Poor vegetation establishment Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Re-seed, re-plant, or re-establish vegetation per original plans ☐ Other / Comments: *“25% full” is defined as ¼ of the depth from the design bottom elevation to the crest of the outflow structure (e.g., if the height to the outflow opening is 12 inches from the bottom elevation, then the materials must be removed when there is 3 inches of accumulation – this should be marked on the outflow structure). INF-2 Page 7 of 11 January 12, 2017 INF-2 Bioretention Date: Inspector: BMP ID No.: Permit No.: APN(s): INSPECTION AND MAINTENANCE CHECKLIST FOR INF-2 BIORETENTION PAGE 2 of 5 Threshold/Indicator Maintenance Recommendation Date Description of Maintenance Conducted Dead or diseased vegetation Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Remove dead or diseased vegetation, re-seed, re-plant, or re-establish vegetation per original plans ☐ Other / Comments: Overgrown vegetation Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Mow or trim as appropriate ☐ Other / Comments: 2/3 of mulch has decomposed, or mulch has been removed Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Remove decomposed fraction and top off with fresh mulch to a total depth of 3 inches ☐ Other / Comments: INF-2 Page 8 of 11 January 12, 2017 INF-2 Bioretention Date: Inspector: BMP ID No.: Permit No.: APN(s): INSPECTION AND MAINTENANCE CHECKLIST FOR INF-2 BIORETENTION PAGE 3 of 5 Threshold/Indicator Maintenance Recommendation Date Description of Maintenance Conducted Erosion due to concentrated irrigation flow Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Repair/re-seed/re-plant eroded areas and adjust the irrigation system ☐ Other / Comments: Erosion due to concentrated storm water runoff flow Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Repair/re-seed/re-plant eroded areas, and make appropriate 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 Engineer] shall be contacted prior to any additional repairs or reconstruction ☐ Other / Comments: INF-2 Page 9 of 11 January 12, 2017 INF-2 Bioretention Date: Inspector: BMP ID No.: Permit No.: APN(s): INSPECTION AND MAINTENANCE CHECKLIST FOR INF-2 BIORETENTION PAGE 4 of 5 Threshold/Indicator Maintenance Recommendation Date Description of Maintenance Conducted Obstructed inlet or outlet structure Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Clear blockage ☐ Other / Comments: Damage to structural components such as weirs, inlet or outlet structures Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Repair or replace as applicable ☐ Other / Comments: INF-2 Page 10 of 11 January 12, 2017 INF-2 Bioretention Date: Inspector: BMP ID No.: Permit No.: APN(s): INSPECTION AND MAINTENANCE CHECKLIST FOR INF-2 BIORETENTION PAGE 5 of 5 Threshold/Indicator Maintenance Recommendation Date Description of Maintenance Conducted Standing water in BMP for longer than 24 hours following a storm event* Surface ponding longer than approximately 24 hours following a storm event may be detrimental to vegetation health Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Make appropriate corrective measures such as adjusting irrigation system, removing obstructions of debris or invasive vegetation, or repairing/replacing clogged or compacted soils. ☐ Other / Comments: Presence of mosquitos/larvae For images of egg rafts, larva, pupa, and adult mosquitos, see http://www.mosquito.org/biology Maintenance Needed? ☐ YES ☐ NO ☐ N/A ☐ Apply corrective measures to remove standing water in BMP when standing water occurs for longer than 24-96 hours following a storm event.** ☐ Other / Comments: *Surface ponding longer than approximately 24 hours following a storm event may be detrimental to vegetation health, and surface ponding longer than approximately 96 hours following a storm event poses a risk of vector (mosquito) breeding. Poor drainage can result from clogging of the media layer, filter course, aggregate storage layer, underdrain, or outlet structure. The specific cause of the drainage issue must be determined and corrected. If it is determined that the underlying native soils have been compacted or do not have the infiltration capacity expected, the [City Engineer] shall be contacted prior to any additional repairs or reconstruction. **If mosquitos persist following corrective measures to remove standing water, or if the BMP design does not meet the 96-hour drawdown criteria because the underlying native soils have been compacted or do not have the infiltration capacity expected, the [City Engineer] shall be contacted to determine a solution. A different BMP type, or a Vector Management Plan prepared with concurrence from the County of San Diego Department of Environmental Health, may be required. INF-2 Page 11 of 11 January 12, 2017 ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit [Use the City’s standard Single Sheet BMP Plan.] • • / / I ' / / //· / / / ' /.-/ / . ' ' ' ' ' • rt I I ' ' . _\ ' ~1~~ I;\.~\ ,,;\\ ...... _J I Q 0 m I I I I 1;--~ 0 '" 0 m \_. \ 1 O"TP / ~ 0~ • 0~ 0 l-FENCEPER >( LANDSCAPING PLANS TOP OF SLOPE = 55.5 1.0%-2.0% -TW=54.5 7" 18" ENGINEERED SOIL J j_----f-f\/::1:! LAYER; "SEE NOTE BELOW 50.0 BOTTOM OF BASIN ELEVATION; PERMEABLE GEOTEXTILE FABRIC TO WRAP GRAVEL SYSTEM TF ELEV= -49.2 F RETAINING VID\LL PER -/'"~-[_·_. --', STRUCTURAL DESIGN; SEESHEET9 0'- 0~ ----------- 0~ .---------APN: -----------204-240-12-00 7" FREEBOARD AND CONVEYANCE ABOVE RISER PLANT MIX PER LANDSCAPE ARCHITECT PLAN 1 "X 4" WEIR OPENING; 53.92100-YR 53.5 TG WSEL 36" X 36" BROOKS BOX; 53. 92 TG 11 3"X 15"WEIR OPENING; 53.25 IE 8" HOPE SOLID-WALL PIPE v1U 6X4-INCH PVC PIPESAT3'O.C. 'B/OFILTRATION "ENGINEERED SOIL" LAYER SHALL BE EVENLY MIXED COMPOSITION OF V'#lSHED SAND, SANDY LOAM TOPSOIL, AND HUMIC COMPOST. THE MIX SHALL CONTAIN 65% SAND, 20% TOPSOIL, AND 15% COMPOST OR HARDWOOD MULCH IN ACCORDANCE WITH 1---FENCE PER I LANDSCAPING PLANS >< If. ef ef ef TWELEV= 54.5 1.8' IMPERMEABLE LINER I ALONG SIDES OF BMPONLY 3" LAYER OF 318" PEA ' GRAVEL ~-9" LAYER GRAVEL STORAGE 4"PVC PIPEAT3'O.C. -49.0 IE 1.5' X 20' FLOW SPREADER DEVICE AND RIP RAP 6" X 24" RAISED PCC SILL TO CONVERT RUNOFF TO SHEET FLOW y-----.!:::v;:;;,L_ TF ELEV= -47.1 t-==1---/..._ RETAJNING WALL PER STRUCTURAL DESIGN; _ SEESHEET9 COUNTYOFSANDIEGOLIDBIOSV'#lLEMEDIAB/065CUTSHEET. TYPICAL DETAIL -BIORETENTION BASIN (INF-2) NOTTO SCALE J:11\CTI\IE JOBSl3529 RINCON GARFIELD snCIVILIREPORTSISWQMPII\TTACHMENTSII\TTACHMENT 4 -SINGLE SHEET BMPII\TT_ 4 -SSBMRDWG BMP ID# RF=65,3 ____ / ___ _ - I ~c:C\ I ~ X .-.-----7 -- -JI -x ,,,....-X-- I I ----- PLAN VIEW -OMA EXHIBIT SCALE: 1" = 10' HORIZONTAL BMP TABLE BMPTYPE SYMBOL CASQA NO. QUANTITY DRAWING NO. TREATMENT CONTROL CD BIORETENTION ~::~\} TC-32 850 SF. DWG 53&-2A BASIN SITE DESIGN 0 SUBSTAINABLE LA 5,691 SF. DWG 53&-2A LANDSCAPING ISD-Kl 0-® DIRECT RUNOFF 12 EA TO PERyiouR • DWG 53&-2A AREAS SD-B ®-@ BMP FROG CREEK MUNDUS BAG/STORMTEK • 3EA DWG 53&-2A PIPE SCREEN CONNEC. TRASH CAPTURE BMPS SOURCE CONTROL ®-@ BMP/WATER NO DUMPIN~ QUALITY SIGN (SC-F) DRAINS TO SD-13 3EA DWG 53&-2A OCEAN @ 24" X 24" BROOKS BOX [g] 1 EA DWG 53&-2A ® 24" X 24" [g] 1 EA DWG 53&-2A BROOKS BOX ® 36" X 36" □ 1 EA BROOKS BOX DWG 53&-2A ®-@ B"AREA 0 17 EA DRAIN DWG 53&-2A @ BMP /WATER NO DUMPING QUALITY SIGN DRAINS TO SD-13 1 EA DWG 53&-2A OCEAN @) TRASH CAPTURE BAG WITHIN MUNDUS BAG TIC OUTLET 3EA DWG 53&-2A STRUCTURE SHEET NO.(S) INSPECTION FREQUENCY CT 2021-0002 SEMI-ANNUALLY SHEET 2,3 SHEETS4 ANNUALLY SHEETS4 ANNUALLY SHEETS4 ANNUALLY SHEETS4 ANNUALLY SHEETS4 ANNUALLY SHEETS4 ANNUALLY SHEETS4 ANNUALLY SHEETS4 ANNUALLY SHEETS4 ANNUALLY SHEETS4 AS-NEEDED RF•61.0 \ ---x X -- \ \ \ \_ _-.....J ______ - ' . ' . 1 I \ --- I BIORETENTION BASIN (INF-2) 2 BMP#1 A=850SF J ~PN: 204-Z40-06-00 ~ BIORETENTION BASIN (JNF-2) 41 3443 \ FLOW SPREADER . \ DEVICE AND RIP \RAP 3 1 -: \ so' / \ I I -------- --x --+---x ---x ---x --x--x r --- MAINTENANCE FREQUENCY ANNUALLY & AS-NEEDED MONTHLY AS-NEEDED AS-NEEDED AS-NEEDED AS-NEEDED AS-NEEDED AS-NEEDED AS-NEEDED AS-NEEDED AS-NEEDED 3 \ APr , 204-240-22-00 \ /. ' I A " " GRAPHIC SCALE: 1" = 10' 10 0 10 20 BMPNOTES: 1. THESE BM PS ARE MANDATORY TO BE INSTALLED PER 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 SWQMP FORADDITIONALINFORMATION. 7. GROUND FLOOR BMP'S SHOWN HEREON ONLY FOR CLARITY. RAISED PLANTERS ON FLOORS ABOVE NOT PICTURED THIS SHEET; SEE SWQMP FOR REFERENCE. BMP CONSTRUCTION AND INSPECTION NOTES: 30 THE EOWWILL VERIFY THAT ALL PERMANENT BMPS -INCLUDING BMPS LOCATED WITHIN THE BUILDING-ARE CONSTRUCTED AND OPERATING IN COMPLIANCE WITH THE APPLICABLE REQUIREMENTS. PRIOR TO OCCUPANCY THE EOWMUSTPROVIDE: 1. PHOTOGRAPHS OF THE INSTALLATION OF PERMANENT BMPS PRIOR TO CONSTRUCTION, DURING CONSTRUCTION,ANDAT FINAL INSTALLATION. 2. A WET STAMPED LETTER VERIFYING THAT PERMANENT BMPS ARE CONSTRUCTED AND OPERATING PER THE REQUIREMENTS OF THE APPROVED PLANS. 3. PHOTOGRAPHS TO VERIFY THAT PERMANENT WATER QUALITY TREATMENT SIGNAGE HAS BEEN INSTALLED. PRIOR TO RELEASE OF SECURITIES, THE DEVELOPER IS RESPONSIBLE FOR ENSURING THE PERMANENT BMPS HAVE NOT BEEN REMOVED OR MODIFIED BY THE NEW HOMEOWNER OR HOA WITHOUT THE APPROVAL OF THE CITY ENGINEER. PARTY RESPONSIBLE FOR MAINTENANCE: NAME: RINCON CAPITAL ADDRESS: 5315AVENIDA ENCINAS, SUITE 200 CARLSBAD, CA 92008 PHONE NO (888) 357-3553 PLAN PREPARED BY: NAME: TYLER G LAWSON COMPANY: PASCO, LARET, SUITER & ASSOCIATES ADORES: 535 N. HWY 101, SUITEA SOLANA BEACH, CA 92075 PHONE NO (858) 259-8212 CERTIFICATION: SIGNATURE SINGLE SHEET BMP EXHIBIT - ATTACHMENT 4 3570 GARFIELD STREET CITY OF CARLSBAD PASCO LARET SUITER ~ ,.~~©tiffe.'ii'[[~ San Diego I Solana Beach I Orange County Phone 858.259.8212 I www.plsaengineering.com PLSA 3529-01