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Home My WebLink AboutCDP 2016-0005; KLOVANISH RESIDENCE; STORM WATER QUALITY MANAGEMENT PLAN; 2017-11-29C,DF? i°t(rooOG CITY OF CARLSBAD PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) Klovanish Residence Project ID No. CDP20I6-0005 Drawing No 503-9A GRNo 2017-0026 ENGINEER OF WORK: Daniel Valdez, RCE 76074 [INSERT CIVIL ENGINEER'S NAME AND PE NUMBER HERE, PROVIDE WET SIGTURE AND STAMP ABOVE LINE] PREPARED FOR: Ir . Steve Klovanish 2721 Carlsbad Blvd. Carlsbad, CA 92008 RECEIVED DEC 0 4 2017 LAND DEVELOPMENT ENGINEERING 0 C) w () PREPARED BY: Coffey Engineering 9666 Businesspark Avenue, Suite 210 San Diego, CA 92131 (858) 831-0111 dan@coffeyengineering.com DATE: 11/29/17 RECORD COPY - Initial Date 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 la: DMA Exhibit Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations Attachment 1 c: Harvest and Use Feasibility Screening (when applicable) Attachment Id: Categorization of Infiltration Feasibility Condition (when applicable) Attachment le: Pollutant Control BMP Design Worksheets I Calculations Attachment 2: Backup for PDP Hydromodification Control Measures Attachment 2a: Hydromodification Management Exhibit Attachment 2b: Management of Critical Coarse Sediment Yield Areas Attachment 2c: Geomorphic Assessment of Receiving Channels Attachment 2d: Flow Control Facility Design Attachment 3: Structural BMP Maintenance Thresholds and Actions Attachment 4: Single Sheet BMP (SSBMP) Exhibit 11/29/17 I CERTIFICATION PAGE I Project Name: Project ID: Klovanish Residence CDP2016-0005 I 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 I 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 thebest of my ability U 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 I the Engineer in Responsible Charge of design of storm water BMPs for this project, of my responsibilities for project design. (T21 C676o7'( p, 4/3 ineer of WqJA Signature, PE Number & Expiratibn Date Daniel Valdez Print Name I Coffey Engineering Company I 11/29/17 Date I, j No C07607 A I 11/29/17 I PROJECT VICINITY MAP \ \ IF C C\AC\ 0 C 5 C C ISITEF AQUA HEDNDA LAGOON VICINITY MAP THOMAS BROS. MAP 1106-G7 NO SCALE 11/29/17 [Insert City's Storm Water Standard Questionnaire (Form E-34) here] 11/29/17 STORM WATER STANDARDS Development Services , City of QUESTIONNAIRE Land Development Engineering Carlsbad 1635 Faraday Avenue E-34 (760) 602-2750 www.carlsbadca.gov I INSTRUCTIONS: To address post-development pollutants that may be generated from development projects, the city requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual, refer to the Engineering Standards (Volume 5). This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to 'PRIORITY DEVELOPMENT PROJECT' (PDP) requirements. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you, thus 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: Klovanish Residence PROJECT ID: CDP2016-0005 ADDRESS: 4000 Block of Adams Street APN: 206-180-41 The project is (check one): E1 New Development LII Redevelopment The total proposed disturbed area is: 18,614 ft2 (0.43 ) acres The total proposed newly created and/or replaced impervious area is: 7,508 ft2 (0.172 ) 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 Dwg. No. 503-9A SWQMP # GR2017-0026 Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. E-34 Page 1 of 4 REV 02/16 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 5, mark the third box stating "my project is not a 'development project' and not subject to the requirements of the BMP manual" and complete applicant information. Justification/discussion: (e.g. the project includes only interior remodels within an existing building): If you answered "no" to the above question, the project is a 'development project', go to Step 2. STEP 2 TOBE 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: Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non- erodible permeable areas; 11 91 Designed and constructed to be hydraulically disconnected from paved streets or roads; Designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets guidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in accordance with the USEPA Green Streets guidance? 3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? If you answered "yes" to one or more of the above questions, provide discussion/justification below, then go to Step 5, mark the second box stating "my project is EXEMPT from PDP .....and complete applicant information. Discussion to justify exemption (e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance): If you answered "no" to the above questions, your project is not exempt from PDP, go to Step 3. E-34 Page 2 of 4 REV 02/16 WEP 3 ________ ---. T0 B LET ORALW OU MP To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1 )): YES NO 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, LI IZ and public development projects on public or private land. 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 El V more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. 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 LI 91 refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812). 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 W1 El development p[oject includes(development on any natural sloi)e)that is twenty-five percent or greater. 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. 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 street, road, highway Z El freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface used for the transportation of automobiles, trucks, motorcycles, and other vehicles. 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 LI II 200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolatedflow from the project to the ESA (i.e. not commingled with flows from adjacent lands).* 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. 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 (AD T) of 100 or more vehicles per day. 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? 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%? (CIVIC Li 91 21.203.040) _ If you answered "yes" to one or more of the above questions, your project is a PDP. If your project is a redevelopment project, go to step 4. If your project is a new project, go to step 5, check the first box stating "My project is a PDP and complete applicant information. If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the second box stating "My project is a 'STANDARD PROJECT'.....and complete applicant information. E-34 Page 3 of 4 REV 02/16 - STEP 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. El El Total proposed newly created or replaced impervious area (B) = sq. ft. Percent impervious area created or replaced (B/A)*100 % If you answered "yes", the structural BMPs required for PDP apply only to the creation or replacement of impervious surface and not the entire development. Go to step 5, check the first box stating "My project is a PDP .....and complete applicant information. If you answered "no," the structural BMP's required for PDP apply to the entire development. Go to step 5, check the check the first box stating "My project is a PDP .....and complete applicant information. STEP 5 CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION My project is a POP and must comply with POP stormwater requirements of the BMP Manual. I understand I must prepare a Storm Water Quality Management Plan (SWQMP) for submittal at time of application. L My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT' stormwater requirements of the BMP Manual. As part of these requirements, I will submit a "Standard Project Requirement Checklist Form E-36" and incorporate low impact development strategies throughout my project. Note: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations and exhibits to verify if 'STANDARD PROJECT' stormwater requirements apply. 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: Daniel Valdez-Coffey Engineering Applicant Title: Civil Engineer Applicant Signature:____________________________ Date: 11129111 * 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. This Box for City Use Only City Concurrence: YES NO By: Date: Project ID: E-34 Page 4 of 4 REV 02/16 SITE INFORMATION CHECKLIST Project Summary Information Project Name Kiovanish Residence Project ID CDP2O16-0005 4385 Adams Street Project Address Carlsbad, CA 92008 Assessor's Parcel Number(s) (APN(s)) APN: 206-180-41 Carlsbad 904 Project Watershed (Hydrologic Unit) Parcel Area 0.427 Acres 18,614 Square Feet) Existing Impervious Area (subset of Parcel Area) Acres (_ Square Feet) Area to be disturbed by the project 0.427 18,614 (Project Area) Acres Square Feet) Project Proposed Impervious Area 0.172 (subset of Project Area) Acres (_7,508 Square Feet) Project Proposed Pervious Area 0.258 11,242 (subset of Project Area) Acres Square Feet) Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the Project. This may be less than the Parcel Area. 11/29/17 Description of Existing Site Condition and Drainage Patterns Current Status of the Site (select all that apply): [Existing development El Previously graded but not built out [Agricultural or other non-impervious use Y1' Vacant, undeveloped/natural Description / Additional Information: Existing Land Cover Includes (select all that apply): YJ 'Vegetative Cover El Non-Vegetated Pervious Areas [Impervious Areas Description /Additional Information: Underlying Soil belongs to Hydrologic Soil Group (select all that apply): El NRCS Type A NRCS Type B LI NRCS Type C L1 NRCS Type D Approximate Depth to Groundwater (GW): [1 GW Depth <5feet feet < GW Depth < 10 feet Lll0 feet < GW Depth <20 feet 0GW Depth > 20 feet Existing Natural Hydrologic Features (select all that apply): El Watercourses [Seeps [Springs [Wetlands 'None Description /Additional Information: 11/29/17 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]: Existing storm water conveyance is natural. There are no existing constructed storm water conveyance systems within the site. Runoff from the adjacent properties to the northeast is conveyed through the site. These two properties discharge runoff from their backyards via sheet flow to the rear of the subject lot. Stormwater entering the lot as well as falling onto the lot flows southwesterly to Adams Street (via sheet flow). 11/29/17 Description ofProposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: Proposed is construction of a single family residence with attached garage, pool, driveway, above ground barbecue and alfresco deck. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): The proposed impervious features of the site will include a house, driveway, and miscellaneous hardscape (i.e. covered lanai, covered rear patio). List/describe proposed pervious features of the project (e.g., landscape areas): Pervious features of the project are landscaping and a biofiltration area (for stormwater quality). Dpes the project include grading and changes to site topography? Yes No Description I Additional Information: Grading will be done to create a crawlspace (which will support a raised foundation), a driveway, and required street widening along the project frontage. Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? Yes II No Descriotion /Additional Information: Small diameter landscape drains will be installed around the perimeter of the new house. These drains will route runoff to a biofiltration area for treatment. The biofiltration area will then discharge treated runoff to an underground storage system equipped with a reduced size orifice for hyd romod ifi cation control. Ultimately, the on-site storm drain system will discharge to Adams Street. 11/29/17 Identify whether any of the following features, activities, and/or pollutant source areas will be I present (select all that apply): On-site storm drain inlets Interior floor drains and elevator shaft sump pumps L Interior parking garages El Need for future indoor & structural pest control 4 Landscape/Outdoor Pesticide Use f Pools, spas, ponds, decorative fountains, and other water features 11 Food service Refuse areas El Industrial processes Outdoor storage of equipment or materials 11 Vehicle and Equipment Cleaning Vehicle/Equipment Repair and Maintenance Fuel Dispensing Areas LI Loading Docks Fire Sprinkler Test Water LI Miscellaneous Drain or Wash Water LI Plazas, sidewalks, and parking lots 11/29/17 Identification of Receiving Water Pollutants of Concern Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable): Runoff from the site enters the public storm drain system through a grated inlet approximately 300 ft. northwest of the site. This inlet is connected to a storm drain that discharges at the opposite side of Adams St. and then 300' down a slope to the Agua Hedionda Lagoon. List any 303(d) impaired water bodies within the path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the pollutant(s)/stressor(s) causing impairment, and identify any TMDLs for the impaired water bodies: 303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs None within the path from the project. Identification of Project Site Pollutants Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see BMP Design Manual Appendix B.6): Pollutant Not Applicable to the Project Site Anticipated from the Project Site Also Receiving Water Pollutant of Concern Sediment X N/A Nutrients x N/A Heavy Metals X N/A Organic Compounds X N/A Trash & Debris X N/A Oxygen Demanding Substances . X Oil & Grease X N/A Bacteria & Viruses X N/A Pesticides X N/A 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. El 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. El 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 I Additional Information (to be provided if a 'No' answer has been selected above) 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? El Yes qlNo, No critical coarse sediment yield areas to be protected based on WMAA maps If yes, have any of the optional analyses presented in Section 6.2 of the BMP Design Manual been performed? El 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite 6.2.2 Downstream Systems Sensitivity to Coarse Sediment 1 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite El 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? El No critical coarse sediment yield areas to be protected based on verification of GLUs onsite E Critical coarse sediment yield areas exist but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP. Critical coarse sediment yield areas exist and require protection. The project will implement management measures described in Sections 6.2.4 and 6.2.5 as applicable, and the areas are identified on the SWQMP Exhibit. Discussion / Additional Information: 11/29/17 I 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 P00 identification name or number correlating to the project's HMP Exhibit and a receiving channel identification name or number correlating to the project's HMP Exhibit. There is one (1) point of compliance. This point is identified as "POCI" on the project's HMP exhibit. This point corresponds to the proposed D-27 pipe outlet approximately 40' southeast of the western most property corner of the subject property. Has a geomorphic assessment been performed for the receiving channel(s)? the low flow threshold is 0.1Q2 (default low flow threshold) Yes, the result is the low flow threshold is 0.102 Yes, the result is the low flow threshold is 0.3Q2 Yes, the result is the low flow threshold is 0.502 If a geomorphic assessment has been performed, provide title, date, and preparer: Discussion /Additional Information: (optional) I I I I I I I I 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. The topography of the site combined with the required street widening improvements limit the possible locations of any treatment/storage facilities within the site. Optional Additional Information or Continuation of Previous Sections AsNeeded This space provided for additional information or continuation of information from previous sections as needed. [Insert City's Standard Project Requirement Checklist Form E-36 (here)] SUMMARY OF PDP STRUCTURAL BMPS City of Carlsbad STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov Project Information Project Name: Klovanish Residence Project ID: CDP2016-0005 DWG No. or Building Permit No.: 503-9A Source Control BMPs All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See Chapter 4 and Appendix E.1 of the BMP Design Manual for information to implement source control BMPs shown in this checklist. Answer each category below pursuant to the following. 'Yes means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the Model BMP Design Manual. Discussion/justification is not required. "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be provided. Source Control Requirement - AppIued SC-I Prevention of Illicit Discharges into the MS4 Z Yes Li No LI N/A Discussion/justification if SC-i not implemented: SC-2 Storm Drain Stenciling or Signage LI Yes tZ No LI N/A Discussion/justification if SC-2 not implemented: Only small on-site landscape drains will be implemented. SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind LI Yes IJ No LI N/A Dispersal Discussion/justification if SC-3 not implemented: There will be no permanent outdoor material storage areas (project is a single family residence). E-36 Page 1 of 4 Revised 03/16 - - Source Control, Requirement (continued) Applied? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall Run-On, Runoff, and Wind Dispersal E] Yes 0 N LI N/A Discussion/justification if SC-4 not implemented: There will be no permanent outdoor work areas where materials would be stored (project is a single family residence). SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal 0 Yes LI No LI N/A Discussion/justification if SC-5 not implemented: Trash bins shall have lids that will be kept closed. SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for guidance). VI On-site storm drain inlets IZ Yes LI No LI N/A LI Interior floor drains and elevator shaft sump pumps LI Yes LI No 111 N/A LI Interior parking garages LI Yes LI No II N/A LI Need for future indoor & structural pest control LI Yes LI No IZ N/A 1j Landscape/Outdoor Pesticide Use 0 Yes LI No LI N/A !j Pools, spas, ponds, decorative fountains, and other water features 0, Yes LI No LI N/A LI Food service LI Yes LI No 0 N/A LI Refuse areas LI Yes LI No 0 N/A LI Industrial processes LI Yes LI No 0 N/A LI Outdoor storage of equipment or materials LI Yes LI No 0 N/A LI Vehicle and Equipment Cleaning LI Yes LI No 121 N/A LI Vehicle/Equipment Repair and Maintenance LI Yes LI No 121 N/A LI Fuel Dispensing Areas LI Yes LI No 121 N/A LI Loading Docks LI Yes LI No 121 N/A 12] Fire Sprinkler Test Water - 121 Yes LI No LI N/A LI Miscellaneous Drain or Wash Water LI Yes LI No 121 N/A LI Plazas, sidewalks, and parking lots LI Yes LI No 0 N/A For "Yes" answers, identify the additional BMP per Appendix El. Provide justification for "No" answers. Project is a single family residence. E-36 Page 2 of 4 Revised 03/16 Site Design BMPs All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual for information to implement site design BMPs shown in this checklist. Answer each category below pursuant to the following. "Yes" means the project will implement the site design BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of the Model BMP Design Manual. Discussion /justification is not required. "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. "N/A" means the BMPs is not applicable at the project site because the project does not include the feature that is addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be provided. Source Control Requirement Applied? SD-I Maintain Natural Drainage Pathways and Hydrologic Features 0 Yes El No El N/A Discussion/justification if SD-i not implemented: SD-2 Conserve Natural Areas, Soils, and Vegetation I0 Yes El No El N/A Discussion/justification if SD-2 not implemented: SD-3 Minimize Impervious Area 0Yes I El No El N/A Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Compaction I0 Yes I El No I UI N/A Discussion/justification if SD-4 not implemented: SD-5 Impervious Area DisDersion I0 Yes El No El N/A Discussion/justification if SD-5 not implemented: E-36 Page 3 of 4 Revised 03/16 Source Control Requirement (continued) Applied? SD-6 Runoff Collection IZ Yes El No I El N/A Discussion/justification if SD-6 not implemented: SD-7 Landscaping with Native or Drought Tolerant Species IZI Yes I El No I El N/A Discussion/justification if SD-7 not implemented: SD-8 Harvesting and Using Precipitation I El Yes I ii No I El N/A Discussion/justification if SD-8 not implemented: Minimal amount of landscaping. Not sufficient demand for harvest & re-use. E-36 Page 4 of 4 Revised 03/16 PDP Structural BMPs All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control must be based on the selection process described in Chapter 5. POPs 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. Step 1A - One (1) DMA within the site was determined to be self-mitigating (SMA 1). It consists mainly of landscaped areas, contains less than 5% impervious areas, is not hydraulically connected to other impervious areas and is separate from DMAs that contain pollutant control BMPs. One DMA was determined to be de minimis (Area 13.1). It is small in nature (250 SF), abuts the perimeter of the site, is not adjacent to another de minimis area, and the topography and land ownership constraints make BMP construction to reasonably capture runoff technically infeasible without a pump system placed in the public ROW. No DMA's are self-retaining. [Continued from previous page - This page is reserved for continuation of description of general strategy for structural BMP implementation at the site.] Step I B - Runoff factors adjusted to account for site design BMPs and soil type. No street trees or rain barrels implemented. Step 2 - Harvest & Use considered infeasible. The 36 hour demand is less than O25DCV. Step 3 - Partial Infiltration determined to be feasible based on site specific infiltration testing conducted by Geotechnical Exploration, Inc. See report dated August 14, 2017. Step 30 - 'Biofiltration' combined with the use of underground storage (cistern) determined to be the best option due to areas available for BMP use as well as on-site soils. Biofiltration area was sized to meet at least the minimum Design Capture Volume requirements. Sizing calculations are included in Attachment 5. Step 4 - BMPs as sized will have enough capacity for DCV. Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP] Structural BMP ID No. IMP A.i DWG Sheet No. Dwg. No. 503-9A Sheet 2 Type of structural BMP: El Retention by harvest and use (H U-1) Retention by infiltration basin (INF-l) Retention by bioretention (IN F-2) E Retention by permeable pavement (lNF-3) 'Partial retention by biofiltration with partial retention (PR-1) El Biofiltration (BF-1) El 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) El Detention pond or vault for hydromodification management E Other (describe in discussion section below) Purpose: . 'Pollutant control only El Hydromodification control only El Combined pollutant control and hyd romod ifi cation control El P re-treatme nt/fore bay for another structural BMP D Other (describe in discussion section below) Discussion (as needed): Based on the infiltration rates measured at the site, partial retention is feasible. All runoff is routed to the biofiltration (with partail retention) area for treatment only (IMP Al). The biofiltration area then flows to a single below ground storage system (A.2) which shall provide all retention required. 11/29/17 Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]' Structural BMP ID No. IMP A.i DWG Sheet No. Dwg. No. 503-9A Sheet 2 Type of structural BMP: Retention by harvest and use (H U-1) Li Retention by infiltration basin (lNF-1) LI Retention by bioretention (INF-2) LI Retention by permeable pavement (INF-3) LI Partial retention by biofiltration with partial retention (PR-1) LI Biofiltration (BF-1) LI 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) v1' Detention pond or vault for hydromodification management LI Other (describe in discussion section below) Purpose: LI Pollutant control only 'Hydromodification control only LI Combined pollutant control and hydromodification control LI P re-treatm ent/fore bay for another structural BMP LI Other (describe in discussion section below) Discussion (as needed'): Based on the infiltration rates measured at the site, partial retention is feasible. All runoff is routed to the biofiltration (with partail retention) area for treatment only (IMP Al). The biofiltration area then flows to a single below ground storage system (A.2) which shall provide all retention required. 11/29/17 ATTACHMENT I BACKUP FOR PDP POLLUTANT CONTROL BMPS This is the cover sheet for Attachment 1. Check which Items are Included behind this cover sheet: Attachment Contents Checklist Sequence Attachment la DMA Exhibit (Required) A( Included See DMA Exhibit Checklist on the back of this Attachment cover sheet. (24"x36" Exhibit typically required) Attachment lb Tabular Summary of DMAs Showing Included on DMA Exhibit in. DMA ID matching DMA Exhibit, DMA Attachment la Area, and DMA Type (Required)* Li Included as Attachment 1 b, separate from DMA Exhibit *Provide table in this Attachment OR on DMA Exhibit in Attachment la Attachment lc Form 1-7, Harvest and Use Feasibility ifincluded Screening Checklist (Required unless LI Not included because the entire the entire project will use infiltration project will use infiltration BMPs BMPs) Refer to Appendix 13.3-1 of the BMP Design Manual to complete Form 1-7. Attachment id Form 1-8, Categorization of Infiltration 'lncTuded Feasibility Condition (Required unless LI Not included because the entire the project will use harvest and use project will use harvest and use BMPs) BMPs Refer to Appendices C and D of the BMP Design Manual to complete Form 1-8. Attachment le Pollutant Control BMP Design lncIuded Worksheets I Calculations (Required) Refer to Appendices B and E of the BMP Design Manual for structural pollutant control BMP design guidelines Use this checklist to ensure the required information has been included on the DMA Exhibit: The DMA Exhibit must identify: ](Underlying hydrologic soil group IApproximate depth to groundwater 'Existing natural hydrologic features (watercourses, seeps, springs, wetlands) 'Critical coarse sediment yield areas to be protected (if present) 'Existing topography and impervious areas VJ(Existing and proposed site drainage network and connections to drainage offsite l'Proposed grading Proposed impervious features VI' 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) I I I I I DMA A.1 (Drains to Impervious/ Developed Areal Pervious I Biofiltration (SF} Area (SF} Area (SF} Pool/Water Feature (SF} I Biofi ltration) 7,258 4,680 236 472 I SMA 1 (Self Mitigating Area) 5,079 8.1 (De Mini mus) 250 Total Developed 7,508 9,759 236 LEGEND DESCRIPTION PROPERTY LIN£ EXISTING CONTOUR PROPOSED CONTOUR BASIN LIMITS SYMBOL N45"45'45'W ·Fr..-----,.... ---.:; ---90-------- 6" PVC DRAIN LIN£ & LANDSCAPE DRAINS DIRECTION OF FLOW BROOKS BOX (OR SIM) W/GRATE BIOFIL TRA T/ON AREA IMPERVIOUS AREA PERVIOUS AREA DMA ID---ID.31 ~ SITE CHARACTERISTICS • HYDROLOGIC SOIL GROUP ........... B • APPROXIMATE DEPTH TO • II ~ 1-.;/~, ~i~.--.·.1 _.~ ~~!-·: .... - GROUND WATER ........................ >6.5' • CRITICAL COARSE SEDIMENT YIELD AR£AS ............................. NON£ .. ns 1,247 Total (SF} Total (AC) Percent Impervious 12,646 0.29 5,854 0.13 250 0.01 18,750 0.43 ........ -------------......... --' ' ' ........ --, -' ---........ ' - ....... _ ------- ....__ ______ ""- ........ ___ -------......... ' -------·, ......... ......... ......... -....._. ___ - \ ----'°'....._. __ -...... ' ......... ......__ _____ _ -- 20 o I 20 40 60 ............ , I '--:~=-~~ spqLE1 t H -20:, I I "- I I I I : L __ I L ___ , '-. - ---- '-I ----~ --.= ....... -~ II 8. T I A Jmp~~~, /·v FROM IMP ~.2 '\ FROM AREA Y. 1 / ""-,,,. ~ ------ --JG PR.N: QIJAX= 1.22 CFS AD AMS s TREET '\__ QIJAX= 1. 18 CFS VIJAX=3.44 FPS -VIJAX=3.40 FPS -----·r ----- ToTAL-MITIGAT.£[J--1'ofAL-uNMmGA5p__ _ _ p:.«. ----- QIJAX= 1.4.,J. Je:F'S Q1JAX=2.61 CFS -------- V~. 11 FPS ViiAx=4. 78 FPS .,........, HYDROMODIFICA TION EXHIBIT 8. I -PROPOSED CONDITIONS ~ COFFEY ENGINEERIN G , INC. 2016 luring uidance Section :mand asib1e. I I Appendix I: Forms and Checklists Appendix I: Forms and Checklists Categorization Eof Infiltration Feasibility 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 Yes No Is the estimated reliable infiltration rate below proposed facility locations greater than 0.5 inches per hour? The response I to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.2 and Appendix D. The infiltration test results below the proposed facility location were 0.032 and 0.031 inches per hour without a minimum factor of safety of 2 applied. Simple open pit testing was performed at 2 locations on the site within or adjacent to the proposed infiltration basin in accordance with Appendix D of the City of Carlsbad BMP design manual. In addition, a comprehensive evaluation of the site was conducted in accordance with Appendix 0.2. Please refer to our "Report of Limited Geotechnical Investigation Proposed Storm Water Infiltration BMPs" for details of the comprehensive evaluation and investigation conducted, simple open pit test rates and simple open pit rate to infiltration rate calculations and maps representative of the study. Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of geotechnical hazards (slope stability, 2 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: The infiltration test results below the proposed facility locations ranged from 0.032 to 0.031 inches per hour without a minimum safety factor of 2 applied. Based on the infiltration test rate findings on the site, infiltration rates greater than 0.5 inches per hour were not encountered. Therefore, a narrative discussion of the associated geotechnical hazards that cannot be mitigated to an acceptable level are not applicable. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. 1-3 February 2016 Appendix I: Forms and Checklists Form 1-8 Page 2 of 4 Screening Question Yes No Criteri a Can infiltration greater than 0.5 inches per hour be allowed without increasing risk of groundwater contamination (shallow water table, storm water pollutants or other factors) that cannot be mitigated to an acceptable level? The response to this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: The infiltration test results below the proposed facility locations ranged from 0.032 to 0.031 inches per hour without a minimum safety factor of 2 applied. Based on the infiltration test rate findings on the site, infiltration rates greater than 0.5 inches per hour were not encountered. Therefore, a narrative discussion of the associated risk of groundwater contamination that cannot be mitigated to an acceptable level are not applicable. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. Can infiltration greater than 0.5 inches per hour be allowed without 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 7 this Screening Question shall be based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: Measured infiltration rates on the site were less than 0.5 inches per hour. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability. If all answers to rows 1 -4 are "Yes" a full infiltration design is potentially feasible. No full Part 1 The feasibility screening category is Full Infiltration infiltration Result * 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 *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. 1-4 February 2016 Appendix I: Forms and Checklists Form 1-8 Page Part 2 - Partial Infiltration vs. No Infiltration Feasibility Screening Criteria Would infiltration of water in any appreciable amount be physically feasible without any negative consequences that cannot be reasonably mitigated? Criteria Screening Question Yes No Do soil and geologic conditions allow for infiltration in any 5 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. The city of Carlsbad BMP Design Manual, Appendix C and Appendix D, do not provide values considered for appreciable rates. Although we do not consider the measured infiltration rates as appreciable from a practical standpoint, we answered yes to this screening question. Based on our infiltration test rates and limited geotechnical investigation of the site, it is our opinion that the soil and geologic conditions allow for the very little appreciable infiltration rates. Please refer to our "Report of Limited Geotechnical Investigation Proposed Storm Water Infiltration BMPs" for details of the comprehensive evaluation and investigation conducted, simple open pit test rates and simple open pit rate to infiltration rate calculations and maps representative of the study. Can Infiltration in any appreciable quantity be allowed without increasing risk of geotechnical hazards (slope 6 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: In our opinion, any long term very partial infiltration at the site will not result in geotechnical hazards which cannot be reasonably mitigated to an acceptable level. Please refer to our "Report of Limited Geotechnical Investigation Proposed Storm Water Infiltration BMPs" for details of the comprehensive evaluation and investigation conducted, simple open pit test rates and simple open pit rate to infiltration rate calculations and maps representative of the study. 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. 1-5 February 2016 Appendix I: Forms and Checklists Form 1-8 Page 4 of 4 Criteria I Screening Question I Yes I No 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: In our opinion, any long term very partial infiltration at the site will not result in a significant risk for groundwater related concerns. Please refer to our "Report of Limited Geotechnical Investigation Proposed Storm Water Infiltration BMPs" for details of the comprehensive evaluation and investigation conducted, simple open pit test rates and simple open pit rate to infiltration rate calculations and maps representative of the study. Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability and why it was not feasible to mitigate low infiltration rates. Can infiltration be allowed without violating downstream 8 water rights? The response to this Screening Question shall be 7 based on a comprehensive evaluation of the factors presented in Appendix C.3. Provide basis: The infiltration of storm water in the expected low rates is not anticipated to violate any downstream water rights. Summarize fmdings 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. If all answers from row 5-8 are yes then partial infiltration design is potentially feasible. Partial Infiltration Part 2 The feasibility screening category is Partial Infiltration. Result* i . If any answer from row 5-8 s no, then infiltration of any volume is considered to be infeasible within the drainage area. The feasibility screening category is No Infiltration. 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. 1-6 February 2016 Appendix E: BMP Design Fact Sheets I on the Project If 1 Potential Sources of Runoff Pollutants _JThenT%YiTT1ProjectIShall tConsider These Source iControl 2 I 3 Permanent Controls—Show on Permanent Controls—List in Table Drawings and Narrative U BM Ps 4 Operational BMPs—Include in Table and Narrative '?S A. Onsite storm drain id Locations of inlets. 1 Mark all inlets with the words "No ' Maintain and periodically repaint inlets Dumping! Flows to Bay" or similar, or replace inlet markings. Z1 Provide storm water pollution 0 Not Applicable prevention information to new site owners, lessees, or operators. See applicable operational BMPs in Fact Sheet SC-44, "Drainage System Maintenance," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com. ' Include -the following in lease agreements: "Tenant shall not allow anyone to discharge anything to storm drains or to store or deposit materials so as to create a potential discharge to storm drains." E-3 February 2016 - - - - - - - - - - - - - - - - - - - Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... ... Then Your Project shall consider These Source Control BMPs 2 4 Potential Sources of Permanent Controls-Show on Permanent Controls-List in Table Operational BMPs-Include in Runoff Pollutants Drawings and Narrative Table and Narrative U B. Interior floor drains U State that interior floor drains and U Inspect and maintain drains to and elevator shaft elevator shaft sump pumps will be prevent blockages and overflow. sump pumps plumbed to sanitary sewer. id Not Applicable U C. Interior parking U State that parking garage floor U Inspect and maintain drains to garages drains will be plumbed to the prevent blockages and overflow. 4' Not Applicable sanitary sewer or an approved BMP U Dl. Need for future U Note building design features that U Provide Integrated Pest indoor & structural discourage entry of pests. Management information to pest control owners, lessees, and operators. id Not Applicable E-4 February 2016 Appendix E: BMP Design Fact Sheets If These Sources Will Be 1 on the Project Site ... - jThenYourProject shall E[consider ;MPsPs 2 -I 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Table Operational BMPs—Include in Runoff Pollutants Drawings and Narrative Table and Narrative 1 D2. Landscape/ Show locations of existing State that final landscape plans will V Maintain landscaping using Outdoor Pesticide trees or areas of shrubs and accomplish all of the following, minimum or no pesticides. Use D Not Applicable ground cover to be f Preserve existing drought tolerant trees, Wr See applicable operational undisturbed and retained. shrubs, and ground cover to the BMPs in Fact Sheet SC-41, U Show self-retaining landscape maximum extent possible. "Building and Grounds areas, if any. ' Design landscaping to minimize Maintenance," in the CASQA 6 Show storm water treatment facilities, irrigation and runoff, to promote Stormwater Quality Handbooks surface infiltration where appropriate, at www.cabmphandbooks.com. and to minimize the use of fertilizers Vf Provide IPM information to and pesticides that can contribute to new owners, lessees and storm water pollution. operators. 1 Where landscaped areas are used to - retain or detain storm water, specify plants that are tolerant of periodic saturated soil conditions. Consider using pest-resistant plants, especially adjacent to hardscape. To ensure successful establishment, select plants appropriate to site soils, slopes, climate, sun, wind, rain, land use, air movement, ecological consistency, and plant interactions. E-5 February 2016 - - - - - - - - - - - - - - - - - - - Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... 1 Potential Sources of Runoff Pollutants - I Then Your 2 Permanent Controls—Show on Drawings These rrSource Control jIBMPs I 3 I 4 Permanent Controls—List in Table Operational BMPs—Include and Narrative in Table and Narrative E. Pools, spas, ponds, 16 Show location of water feature 16 Pool backwash to be plumbed to the See applicable operational decorative fountains, and a sanitary sewer cleanout in sanitary sewer. Place a note on the BMPs in Fact Sheet SC-72, and other water an accessible area within 10 feet. plans and state in the narrative that "Fountain and Pool features. this connection will be made Maintenance," in the CASQA U Not Applicable according to city requirements. Stormwater Quality Handbooks at www.cabmphandbooks.com. U F. Food service U For restaurants, grocery stores, U Describe the location and features of 16 Not Applicable and other food service the designated cleaning area. operations, show location U Describe the items to be cleaned in (indoors or in a covered area this facility and how it has been sized outdoors) of a floor sink or other to ensure that the largest items can be area for cleaning floor mats, accommodated. containers, and equipment. U On the drawing, show a note that this drain will be connected to a grease interceptor before discharging to the sanitary sewer. E-6 February 2016 Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... 1 ... Then Your Project shall consider These Source Control 2 I 3 BMPs I 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Table Operational, BMPs—Include in Runoff Pollutants Drawings and Narrative Table and Narrative U G. Refuse areas U Show where site refuse and U State how site refuse will be U State how the following will be Not Applicable recycled materials will be handled and provide supporting implemented: handled and stored for pickup. detail to what is shown on plans. Provide adequate number of U If dumpsters or other receptacles U State that signs will be posted on receptacles. Inspect receptacles are outdoors, show how the or near dumpsters with the words regularly; repair or replace leaky designated area will be covered, "Do not dump hazardous receptacles. Keep receptacles graded, and paved to prevent materials here" or similar. - covered. Prohibit/prevent run- on and show locations of dumping of liquid or hazardous berms to prevent runoff from wastes. Post "no hazardous the area. Also show how the materials" signs. Inspect and pick designated area will be protected up litter daily and clean up spills from wind dispersal. immediately. Keep spill control U Any drains from dumpsters, materials available on- site. See compactors, and tallow bin areas Fact Sheet SC-34, 'Waste shall be discharged to an Handling and Disposal" in the approved BMP. CASQA Stormwater Quality U Refer to City Standard Drawing Handbooks at www.cabmphandbooks.com. GS-16 for details. E-7 February 2016 - - - - - - - - - - - - - - - - - - - Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... ... Then Your Project shall consider These Source Control BMPs 2 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Table and Operational BMPs—Include Runoff Pollutants Drawings Narrative in Table and Narrative Table and Narrative U H. Industrial U Show process area. U If industrial processes are to be located U See Fact Sheet SC-10, "Non- processes. onsite, state: "All process activities to be Stormwater Discharges" in the 16 Not Applicable performed indoors. No processes to CASQA Stormwater Quality drain to exterior or to storm drain Handbooks at system." www.cabmphandbooks.com. U I. Outdoor storage of U Show any outdoor storage U Include a detailed description of U See the Fact Sheets SC-31, equipment or areas, including how materials materials to be stored, storage areas, and "Outdoor Liquid Container materials. (See rows J will be covered. Show how structural features to prevent pollutants Storage" and SC-33, "Outdoor and K for source areas will be graded and from entering storm drains. Storage of Raw Materials" in control measures for bermed to prevent run-on or Where appropriate reference the CASQA Stormwater vehicle cleaning, runoff from area and protected documentation of compliance with the Quality Handbooks at repair, and from wind dispersal. requirements of local Hazardous www.cabmphandbooks.com. maintenance.) U Storage of non-hazardous Materials Programs for: Not Applicable liquids shall be covered by a Hazardous Waste Generation roof and/or dram to the sanitary sewer system, and be Hazardous Materials Release contained by berms, dikes, Response and Inventory liners, or vaults. California Accidental Release U Storage of hazardous materials Prevention Program and wastes must be in E Aboveground Storage Tank compliance with the city's hazardous materials ordinance Uniform Fire Code Article 80 and a Hazardous Materials Section 103(b) & (c) 1991 Management Plan for the site. E Underground Storage Tank E-8 February 2016 Appendix E: BMP Design Fact Sheets If These Sources Will Be _ Potential Sources of Runoff Pollutants on the Project 2 ... 1 Then Your [IEJn rn xmIPm1iiS MPs I 3 I 4 Permanent Controls—Show on Drawings Permanent Controls—List in Operational BMPs—Include in Table and Narrative Table and Narrative U J. Vehicle and 0 Show on drawings as appropriate: U If a car wash area is not Describe operational measures to Equipment Cleaning Commercial/industrial facilities having provided, describe measures implement the following (if I] Not Applicable vehicle /equipment cleaning needs shall either taken to discourage onsite applicable): provide a covered, bermed area for washing car washing and explain how activities or discourage vehicle/ equipment these will be enforced. U Washwater from vehicle and washing by removing hoe bibs and installing equipment washing operations signs prohibiting such uses. shall not be discharged to the Commercial car wash facilities shall be storm drain system. designed such that no runoff from the facility U Car dealerships and similar is discharged to the storm drain system. may rinse cars with water only. Wastewater from the facility shall discharge to U See Fact Sheet SC-21, 'Vehicle the sanitary sewer, or a wastewater reclamation and Equipment Cleaning," in system shall be installed, the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com E-9 February 2016 - - - - - - - - - - - - - - - - - - - Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... - ... Then Your Project shall consider These Source Control BMPs I 2 3 I 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Drawings Table and Narrative Table and Narrative D K. El Accommodate all vehicle D State that no vehicle repair or In the report, note that all of the following Vehicle/Equipment equipment repair and maintenance will be done restrictions apply to use the site: Repair and maintenance indoors or designate outdoors, or else describe the D No person shall dispose of, nor permit Maintenance an outdoor work area and design required features of the the disposal, directly or indirectly of 46 Not Applicable the area to protect from rainfall, outdoor work area. vehicle fluids, hazardous materials, or run-on runoff, and wind dispersal. D State that there are no floor rinsewater from parts cleaning into D Show secondary containment for drains or if there are floor storm drains. exterior work areas where motor drains, note the city from U No vehicle fluid removal shall be oil, brake fluid, gasoline, diesel which an industrial waste performed outside a building, nor on fuel, radiator fluid, acid- discharge permit will be asphalt or ground surfaces, whether containing batteries or other obtained and that the design inside or outside a building, except in hazardous materials or hazardous meets city's requirements. such a manner as to ensure that any wastes are used or stored. Drains U State that there are no tanks, spilled fluid will be in an area of shall not be installed within the containers or sinks to be used secondary containment. Leaking secondary containment areas. for parts cleaning or rinsing vehicle fluids shall be contained or U Add a note on the plans that states or, if there are, note the city drained from the vehicle immediately. either (1) there are no floor drains, from which an industrial U No person shall leave unattended drip or (2) floor drains are connected waste discharge permit will be parts or other open containers to wastewater pretreatment obtained and that the design containing vehicle fluid, unless such systems prior to discharge to the meets city's requirements. containers are in use or in an area of sanitary sewer and an industrial secondary containment. waste discharge permit will be obtained. E-10 February 2016 Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... -- Then Your Project shall consider These Source Control BMPs 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Drawings Table and Narrative Table and Narrative U The property owner shall dry sweep U L. Fuel Dispensing Li Fueling areas1 shall have Areas impermeable floors (i.e., portland the fueling area routinely. id Not Applicable cement concrete or equivalent U See the Business Guide Sheet, smooth impervious surface) that "Automotive Service—Service are (1) graded at the minimum Stations" in the CASQA Stormwater slope necessary to prevent Quality Handbooks at pondling; and (2) separated from www.cabmphandbooks.com. the rest of the site by a grade break that prevents run-on of storm water to the MEP. U Fueling areas shall be covered by a canopy that extends a minimum of ten feet in each direction from each pump. [Alternative: The fueling area must be covered and the cover's minimum dimensions must be equal to or greater than the area within the grade break or fuel dispensing area'.] The canopy [or cover] shall not drain onto the fueling area. 1. The fueling area shall be defined as the area extending a minimum of 6.5 feet from the corner of each fuel dispenser or the length at which the hose and nozzle assembly may be operated plus a minimum of one foot, whichever is greater. E-11 February 2016 - - - - - - - - - - - - - - - - - - - Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... -- Then Your Project shall consider These Source Control BMPs 2 I3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Drawings Table and Narrative Table and Narrative M. Loading Docks D Show a preliminary design for the U Move loaded and unloaded items 46 Not Applicable loading dock area, including indoors as soon as possible. roofing and drainage. Loading U See Fact Sheet SC-30 "Outdoor docks shall be covered and/or Loading and Unloading" in the graded to minimize run-on to and CASQA Stormwater Quality runoff from the loading area. Roof Handbooks at downspouts shall be positioned to www.cabmphandbooks.com. direct storm water away from the loading area. Water from loading dock areas should be drained to an approved BMP. Direct connections to storm drains from depressed loading docks are prohibited. U Loading dock shall be equipped with a spill control valve or equivalent device, which shall be kept closed during periods of operation. U Provide a roof overhang over the loading area or install door skirts (cowling) at each bay that enclose the end of the trailer. E-12 February 2016 Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... ... Then Your Project shall consider These Source Control BMPs 2 Potential Sources of Permanent Controls— Permanent Controls—List in Table and Operational BMPs—Include in Runoff Pollutants Show on Drawings Narrative Table and Narrative 46 N. Fire Sprinkler Provide a means to drain fire sprinkler test water 16 See the note in Fact Sheet SC- Test WaLer to the sanitary sewer or approved BMP. 41, "Building and Grounds D Not Applicable Maintenance," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com. 0. Miscellaneous Drain or D Boiler drain lines shall be directly or indirectly Wash Water connected to the sanitary sewer system and may U Boiler drain lines not discharge to the storm drain system. ?i Condensate drain 6 Condensate drain lines may discharge to lines landscaped areas if the flow is small enough that U Rooftop runoff will not occur. Condensate drain lines may equipment not discharge to the storm drain system. U Drainage sumps U Rooftop mounted equipment with potential to produce pollutants shall be roofed and/or have Roofing, gutters, secondary containment. and trim U Any drainage sumps onsite shall feature a U Not Applicable sediment sump to reduce the quantity of sediment in pumped water. Avoid roofing, gutters, and trim made of copper or other unprotected metals that may leach into runoff. E-13 February 2016 - - - - - - - —. - - - - - - - - - - - Appendix E: BMP Design Fact Sheets If These Sources Will Be on the Project Site ... - ThenT%'TT 2 consider These rj Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Drawings Table and Narrative Table and Narrative 1 P. Plazas, sidewalks, 4' Plazas, sidewalks, and parking lots shall and parking lots, be swept regularly to prevent the U Not Applicable accumulation of litter and debris. Debris from pressure washing shall be collected to prevent entry into the storm drain system. Washwater containing any cleaning agent or degreaser shall be collected and discharged to the sanitary sewer and not discharged to a storm drain. E-14 February 2016 I I I I I San Diego County 85 th Percentile lsopluvials Legend --!5th PERCEl(Tll.E ISOPLI.MAL D INCORPORATED CITY NOTE: The 85th percentile is a 24' hour rainfall total. tt represetns a vaue .such that 85% of the observed 24 hovr rainfall totals will be less than that value.. N + ~MIis 0 1 2 .i I I f'OIS~.Qlo'>.!S:W:,,.<Q:)'f!llO.lfV.:,,~()l''J.'<1'..._.,._.,f~rE.'I: EXl"IIESSCJA.11oA&~a;rnoru"lfll>·o.1-,£lW'l.£l ,.._ • .,,u~~4 .. 'l'IAHO-..__.JOll:.,,iur,Q.V# ~ ._n, ... _ _,_ .. ~---s.a..-.."'IIIG ""._...,.,._,~-........ i..~,o.4..-Jt-,1,t,. .. - ----tll$l,NOIIG. l!ai:o,,o.d.--.-....CU~ .... __ lr_ ... .,,.,"'11'41t.Q,o,-·s«<;IS :-. .. ,i:,. ~:-,lbri(lt,.;t,.., .. ~ ............... ",;:,;:,:r~ ,,.,..,,....._,,_,.,_.._a .... •Not ... _ _,., --'4-~6C.,._. ~~m, ,.~-,..._ ............ .-c.w>w -4-----... -.;,.-:;-."Cl«•:n tlln.ll:,Ci, .,_C:.~""'5.U:.CTll:;.}IC\'GoU,_.~,. 'P,;1~.M-• WEG =a1s ~=c Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods ·-~ ..:_~\.--l\ ~- Figure B.1-1: 85th Percentile 24-hour I sopluvial Map Drainage Management Area Surface Type Runoff Factor Concrete or Ashphalt 0.9 7,258 Amended, Mulched Soils or Landscape 0.3 4,680 Total 11,938 Weighted Runof Factor 0.660 h ... ,. ... -. ' . l.\Wu., .... , ,ww~11lJl:O' .• I !il!.ll!t 'l_!ri, fTfITTIJ ' .•· 1 85th Percentile 24-hr storm depth from Figure b.1-1 d = 0.59 inches 2 Area tributary to BMP (s) A= 0.274 acres Area weighted runoff factor (estimate using 3 Appendix B.1.1 and B.2.1 C= 0.66 unitless 4 Street trees volume reduction TCV = 0.000 cubic-feet 5 Rain barrels volume reduction RCV= 0.000 cubic-feet 6 Calculated DCV = (3630 x C x d x A) -TCV -RCV DCV= 387.305 cubic-feet Page 1 of 3 ti.,mni"r:laMi@ -l«m -1!mtmt3 ... •111 • 11:11 ............. 111 : • .. ,.u.. • • 1111 : ••• ,;1!.l:.r ... -.... --1rruMJ. -·· m:: . .... Pollutant Control BMP Design for: A.1 (Drains to Biofiltration) ~ -•r"" . ~{liJ:il,,1r11111or.,. t . l:ffifllr.l •· ..• .,1,l]gl .,.,'. ' .... - 1 Remaining DCV after implementing retention BMPs 387.31 cubic-feet Partial Retantion Infiltration from Worksheet D.5-1 if partial 2 infiltration is feasible 0.01 in I hr Allowable drawdown time for aggregate storage 3 below underdrain 36 hours Depth of runoff that can be infiltrated [Line 2 x Line 4 3] 0.36 inches 5 Aggregate pore space 0.4 in I in Required depth of gravel below the underdrain [Line 6 4/Line5] 0.9 inches 7 Assumed surface area of the biofiltration BMP 237 sq-ft 8 Media retained pore space 0.1 in I in Volume retained by BMP [[Line 4 + (Line 12 x Line 9 8}]/12] x Line 7 42.66 cubic-feet 10 DCV that requires biofiltration [Line 1 -Line 9] 344.65 cubic-feet BMP Parameters Surface Ponding [6 inches minimum, 12 inches 11 maximum] 10 inches 12 Media Thickness [18 inches minimum] 18 inches 13 Aggregate Storage above underdrain invert (12 inches typical) -use O inches for sizing if the aggegate is not over the entire bottom su rface area 10 inches 14 Media available pore space 0.2 in I in 15 Media filtration rate to be used for sizing 5 in I hr Baseline Calculations 16 Allowable Routing Time for sizing 6 hours 17 Depth filtered during storm [Line 15 x Line 16] 30 inches Depth of Detention Storage [Line 11 + (Line 12 x Line 18 14) + (Line 13 x Line 5)] 17.60 inches 19 Total Depth Treated [Line 17 + Line 18] 47.6 inches Page 2 of 3 {~ .... --~--•••I~ I 2 ,.. "•'lili""--:.'"Tern1rna11,~~Gflill ... ,_...._ 1111•1,. ! 111.•n• • 1 f1.1!Jr ~UeHI Option 1 -Biofilter 1.5 times the DCV 20 Required biofiltered volume [1.5 x Line 10] 516.97 cubic-feet 21 Required Footprint [Line 20 / Line 19] x 12 130.33 sq-ft Option 2 -Store 0. 75 of the remaining DCV in pores and ponding Required Storage {surface+ pores) Volume [0.75 x 22 Line 10] 258.48 cubic-feet 23 Required Footprint [Line 22 / Line 18] x 12 176.24 sq-ft Footprint of the BMP 24 Area draining to the BMP 11938 sq-ft Adjusted Runoff Factor for drainage area {Refer to 25 Appendix B.1 and B.2) 0.660 BMP Sizing factor {Default 0.03 or an alternative minimum footprint sizing factor from Worksheet 26 B.5-2, Line 11) 0.03 27 Minimum BMP Footprint [Line 24 x Line 25 x 0.03] 236.37 sq-ft Footprint of the BMP = Maximum{Minimum(Line 28 21, Line 23), Line 26) 236.37 sq-ft Page 3 of 3 I 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: I Attachment Contents Checklist Sequence Attachment 2a Hydromodification Management Included Exhibit (Required) See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. Attachment 2b Management of Critical Coarse !'Exhibit showing project drainage Sediment Yield Areas (WMAA Exhibit boundaries marked on WMAA is required, additional analyses are Critical Coarse Sediment Yield optional) I Area Map (Required) See Section 6.2 of the BMP Design Optional analyses for Critical Coarse Manual. Sediment Yield Area Determination 6.2.1 Verification of Geomorphic Landscape Units Onsite 6.2.2 Downstream Systems Sensitivity to Coarse Sediment 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite Attachment 2c Geomorphic Assessment of Receiving v3 Not performed Channels (Optional) : Included See Section 6.3.4 of the BMP Design Manual. Attachment 2d Flow Control Facility Design and Included Structural BMP Drawdown Calculations (Required) See Chapter 6 and Appendix G of the BMP Design Manual Use this checklist to ensure the required information has been included on the I Hydromodification Management Exhibit: The Hydromodification Management Exhibit must identify: fUnderIying hydrologic soil group fApproximate 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 ?fProposed design features and surface treatments used to minimize imperviousness 'Point(s) of Compliance (POC) for Hydromodification Management YLTExisting and proposed drainage boundary and drainage area to each P00 (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) I I II I LEGEND ~ 0 ~ ~ ~ j --- DESCRIPTION SYMBOL PROPERTY LINE N45"45'45"W ·Ff...-- - SCALE: 1 "=40' EXISTING CONTOUR =90 BASIN LIMITS ----- DIRECTION OF FLOW OMA 10---jx ,1 Impervious/ Developed Pervious I I I Percent OMA Area (SF} Area (SF} Total (SF} Total (AC} Impervious Y.1-Offsite Tributary Area 20,610 0.47 X.1 18,614 18,614 0.43 0.00°,1, HYDROMODIFICA TION EXHIBIT A . 1 -EXISTING CONDITIONS ~ COFFEY ENGINEERING, INC. Impervious/ DMA Developed Areal Pervious I Biofiltration (SF) Area (SF) Area (SF) Pool/Water Feature (SF) A.l (Drains to Biofiltrationl SMA 1 (Self Mitigating Area) B.1 (De Mini mus) Total Developed 7,258 4,680 236 5,079 250 7,508 9,759 236 LEGEND SYMBOL DESCRIPTION PROPERTY LINE EXISTING CONTOUR PROPOSED CONTOUR BASIN LIMITS N45°45'45''W ·Fe.-- --- ---90--- ---90 -------- 6" PVC DRAIN LINE & LANDSCAPE DRAINS DIRECTION OF FL OW BROOKS BOX (OR SIM) W/GRA TE 8/0F/LTRA T/ON AREA IMPERVIOUS AREA PERVIOUS AREA OMA 10--10.31 - SITE CHARACTERISTICS • HYDROLOG/C SOIL GROUP ........... B • APPROXIMATE DEPTH TO .. H ~ - GROUND WATER ........................ >6.5 ' • CRITICAL COARSE SEDIMENT YIELD AREAS ............................. NONE .. 472 ns 1,247 Total (SF) Total (AC) Percent Impervious 12,646 0.29 5,854 0.13 250 0.01 18,750 0.43 ........ ----... --------- " " ", --, ---" ........ -', ..._ ___ _ ----........ ------.......... ---'\ -" ---------........ ----'\ ----------- ' ........ ------- ------.=. 20 al 20 w 60 -----, j ---==-~~ S~LE1 1 "-2£)..' "- I l "-- I I I l I L __ I L ___ , "-- --B. /1 :df ~ ...-_ '3=:== --IC Pl.---______ / FROM IMP ~-:2 '\ FROM AREA Y. 1 ~ 6c -QMAX:_1.22 CFS ADAMS STREET '\...__QMA>:=1.18 CFS ____..j';;i; ~--VMAX-3.44 ,Ps -VMAX=3 40 FPS fr CT _____ f -----. ~ TQTAL-M/TIGAT£D-',OTAL-UNMITIGAIED p~ ----- IC .4..J: crs QMA>:=2-£+-ers p-. 110J»F~~4. 78 FPS ------ ------- HYDROMODIFICA TION EXHIBIT 8. 1 -PROPOSED CONDITIONS ~ C OFFEY EN G INEERIN G , INC I I I I I I I DIMENSIONS PER DETAIL 2 18x18 BROOKS FREEBOARD GRATED INLET F-10 ol C))M,N i o"A (OVERFLOW STI W TWU1 W' - -- 'TTTTT'T'' TTT'r' !Iii!!Ipu!I!uuIuIi.FN TO DETENTION VEGETATION PER LANDSCAPE PLAN 5. AGGREGATE STORAGE LAYER- GROUND COVER: 3" OF FINELY SHREDDED HARDWOOD 10" OF " CRUSHED ROCK, 3" MINIMUM BELOW INVERT MULCH OF UNDERDRAIN J. 6" PERFORATED UNDERDRAIN—LEVEL 6. FILTER COURSE - 3" CLEAN SAND OVER 3" NO. 8 (WITH 3" AGGREGATE STORAGE LAYER BELOW) STONE 4. 18" SOIL MEDIA—LOAMY SAND W/ 7. NOT USED MINIMUM 5'/HR PERCOLATION* 8. CLEANOUT * SOIL MEDIA CONSISTS OF 85% WASHED COURSE SAND, 10% FINES (RANGE: 8-12Y.; DETAIL 'A ' - BIOFIL TRA TION AREA W/ 87. = 2 IN/HR INFILTRATION RATE, 127- = 1 IN/HR INFILTRATION RATE), AND 5% PARTIAL RETENTION TYPICAL SECTION ORGANIC MATTER. FOR ADDITIONAL STANDARDS SEE SAN DIEGO LOW IMPACT DEVELOPMENT NOT TO SCALE DESIGN MANUAL SECTION 1.2.4.2 SOIL MEDIA MUST MAINTAIN A MINIMUM INFILTRATION RATE OF5 IN/HR BOOT COLLAR TYPICAL AT TANK INLET AND OUTLET PIPES 12" CORRUGATED PVC OVERFLOW PIPE IEour=9 7.36 MAINTENANCE/OUTFLOW STRUCTURE ______ WITH COVER T I?- 2' (MIN.) COVER WITH NATIVE MATERIAL 1 2" CLEAN SAND ET- 1500 SERIES ECO—RAIN TANKTM WRAPPED IN CEO TEX TILE FABRIC 6" PVC INFLOW t/PIPE(S) IEIN=9 7. 73' 4-- 4-4- BIOFIL TRA TION AREA A. 1 6" CORRUGATED PVC PIPE TO CURB OULET DETAIL 'C'- BIOFIL TRA TION DIMENSIONS 4- 2" CLEAN SAND BASE SCALE: 1"=10' '-3" PVC OUTLET PIPE w/0.35 END CAP ORIFICE L MAINTENANCE ACCESS/ OUTLET STRUCUTRE DETAIL 'B'- ECORAIN DETENTION SYSTEM IMPERMEABLE LINER KL 0 VANISH RESIDENCE HYDROMODIFICA TION EXHIBIT 8.2 (DETAILS, COFFEY ENGINEERING, INC. Klovanish Residence -Critical Coarse Sediment Yield Area Map Integrated Management Practices Sizing Calculations Surface Area (ft2) Isurface Area (Ac) Surface Type lRunoff Factor Impervious Area 7,258.001 0.17 Concrete (1.0) 1 Pervious Area 4,688.001 0.11 Landscape (0.1) 1 0.1 Pervious Payers 0.001 0.00 Solid Unit Payers ol 0.2 IMP Type Area Factor IVI Factor IV2 Factor Surface Area Required (ft Vi Required (ft3) IV2 Required (ft) Surface Area Provided (ft2) ~Vl Provided (ft3) IV2 Provided (ft) Cistern jN/A 0.181N/A I - - 0.001 1,390.821 - 0.001 1 1,400.001 Orifice Sizing Calculations (1) Q=Cd x A x (2gH)°"5 Orifice Discharge Equation (2) A= [0.1 Q 2 x AoMA]/Cd x (2gH)°'5 Orifice Area Equation (for 0.1Q2 as lower limit threshold) A.l (Drains to Biofiltration) I Cd = 0.58 dimensionless Rain Gage Soil Type Oceanside D Soil Rain Gauge Oceanside A Oceanside A Oceanside A Oceanside B Oceanside B Oceanside B Oceanside C Oceanside C Oceanside C Oceanside D Oceanside D Oceanside D Oceanside A Oceanside B Oceanside C Oceanside D Oceanside Impervious g = 32.2 ft/s2 H = 5.0000 ft Cover Slope Q2 Sizing Factor DMA Area (ac) Scrub Steep 0.244 0.29 Table 1·6. Unit Runoff Ratios Cover Slope Q2 Q10 l (cfs/acre) (cfs/ac) Scrub Low 0.035 0.32 Scrub Moderate 0.093 0.367 Scrub Steep 0.163 0.42 Scrub Low 0.08 0.365 Scrub Moderate 0.134 0.4 Scrub Steep 0.181 0.433 I Scrub Low 0.146 0.411 Scrub Moderate 0.185 0.433 Scrub Steep 0.217 0.458 Scrub Low 0.175 0.434 Scrub Moderate 0.212 0.455 Scrub Steep 0.244 0.571 Urban Moderate 0.152 0.411 Urban Moderate 0.188 0.434 Urban Moderate 0.216 0.458 Urban Moderate 0.247 0.571 Moderate 0.557 0.949 Lower Limit of Q2 0.1 Orifice Area (in2) Orifice Dia. (in) 0.10 0.35 Storage System Drawdown Time For Basin: System: Eco Rain A.l (Drains to Biofiltration) Orifice Dia. (ft) Orifice Dia. (in) Footprint (Ft2) Drawdown Time (hours) 0.03 0.35 280 17.350 <96 Hours -OKAY Depth of Water .6Time .6Time in Storage Chamber Q (ft3/sec) .6 Vol (ft3) (sec) .6Time (m in) (hours) 5.0000 0.043934423 0 4.9167 0.043566765 23.33 533.32 8.88 0.14 4.8333 0.043195977 23.33 537.86 8.96 0.14 4.7500 0.042821979 23.33 542.52 9.04 0.15 4.6667 0.042444685 23.33 547.30 9.12 0.15 4.5833 0.042064008 23.33 552.21 9.2 0.15 4.5000 0.041679854 23.33 557.25 9.28 0.15 4.4167 0.041292126 23.33 562.43 9.37 0.15 4.3333 0.040900722 23.33 567.77 9.46 0.15 4.2500 0.040505537 23.33 573.25 9.55 0.15 4.1667 0.040106458 23.33 578.90 9.64 0.16 4.0833 0.039703368 23.33 584.72 9.74 0.16 4.0000 0.039296143 23.33 590.72 9.84 0.16 3.9167 0.038884654 23.33 596.90 9.94 0.16 3.8333 0.038468763 23.33 603.29 10.05 0.16 3.7500 0.038048327 23.33 609.88 10.16 0.16 3.6667 0.037623192 23.33 616.70 10.27 0.17 3.5833 0.037193199 23.33 623.74 10.39 0.17 3.5000 0.036758176 23.33 631.04 10.51 0.17 3.4167 0.036317942 23.33 638.60 10.64 0.17 3.3333 0.035872306 23.33 646.44 10.77 0.17 3.2500 0.035421065 23.33 654.57 10.9 0.18 3.1667 0.034963999 23.33 663.01 11.05 0.18 3.0833 0.03450088 23.33 671.80 11.19 0.18 3.0000 0.034031458 23.33 680.94 11.34 0.18 2.9167 0.03355547 23.33 690.46 11.S 0.19 2.8333 0.033072632 23.33 700.40 11.67 0.19 2.7500 0.03258264 23.33 710.78 11.84 0.19 2.6667 0.032085166 23.33 721.63 12.02 0.2 2.5833 0.031579857 23.33 733.00 12.21 0.2 2.5000 0.031066329 23.33 744.92 12.41 0.2 2.4167 0.030544168 23.33 757.44 12.62 0.21 2.3333 0.030012925 23.33 770.62 12.84 0.21 2.2500 0.029472107 23.33 784.51 13.07 0.21 2.1667 0.028921178 23.33 741.29 12.35 0.2 2.0833 0.028359548 23.33 814.70 13.57 0.22 DrawDown Cale Page 1 2.0000 0.027786569 23.33 831.16 13.85 0.23 1.9167 0.027201523 23.33 848.66 14.14 0.23 1.8333 0.026603614 23.33 867.32 14.45 0.24 1.7500 0.025991955 23.33 887.27 14.78 0.24 1.6667 0.025365551 23.33 908.66 15.14 0.25 1.5833 0.024723281 23.33 931.67 15.52 0.25 1.5000 0.024063875 23.33 956.53 15.94 0.26 1.4167 0.023385883 23.33 983.49 16.39 0.27 1.3333 0.022687639 23.33 1012.87 16.88 0.28 1.2500 0.021967212 23.33 1045.05 17.41 0.29 1.1667 0.021222343 23.33 1080.50 18 0.3 1.0833 0.020450361 23.33 1119.83 18.66 0.31 1.0000 0.019648071 23.33 1163.80 19.39 0.32 0.9167 0.018811596 23.33 1213.39 20.22 0.33 0.8333 0.017936153 23.33 1269.91 21.16 0.35 0.7500 0.017015729 23.33 1335.16 22.25 0.37 0.6667 0 .016042583 23.33 1411.64 23.52 0.39 0.5833 0.015006462 23.33 1502.99 25.04 0.41 0.5000 0.013893285 23.33 1614.77 26.91 0.44 0.4167 0.012682776 23.33 1755.96 29.26 0.48 0.3333 0.011343819 23 .33 1942.29 32.37 0.53 0.2500 0.009824036 23.33 2204.60 36.74 0.61 0.1667 0.008021292 23.33 2615.06 43.58 0.72 0.1000 0.006213266 18.67 2622.72 43.71 0.72 0.0900 0.005894421 2.80 462.51 7.7 0.12 0.0800 0.005557314 2.80 489.00 8.15 0.13 0.0700 0.005198391 2.80 520.65 8.67 0.14 0.0600 0.004812775 2.80 559.37 9.32 0.15 0.0500 0.004393442 2.80 608.28 10.13 0.16 0.0400 0.003929614 2.80 672.82 11.21 0.18 0.0300 0.003403146 2.80 763.69 12.72 0.21 0.0200 0.002778657 2.80 905.88 15.09 0.25 0.0100 0.001964807 2.80 1180.57 19.67 0.32 0.0000 0 2.80 2850.15 47.5 0.79 Total Vol. 1400.00 Total Hou rs 17.35 l*Omax DrawDown Cale Page 2 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: Y 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: El 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 El 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) 11 Manufacturer and part number for proprietary parts of structural BMP(s) when applicable 1 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.) El 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 ATTACHMENT 3A Maintenance Plan ities ulated materials, ation per original plans. s than the design height nd adjust the irrigation a nd make appropriate sion control blankets, nor re-grading to e original plan. If the MP to the original plan Led prior to any such as adjusting s of debris or invasive airing/replacing clogged Klovanish Residence Treatment BMP Maintenance Plan Maintenance Indicators and Actions for Detention BMPs Typical Maintenance Indicator(s) for Detention Basins - - Maintenance Activities Poor vegetation establishment Re-seed, re-establish vegetation. Erosion due to concentrated irrigation Repair/re-seed/re-plant eroded areas and adjust the irrigation flow system. Erosion due to concentrated storm Mow or trim as appropriate, but not less than the design height water runoff flow of 4". Repair/re-seed/re-plant eroded areas and make appropriate Erosion due to concentrated irrigation flow corrective measures such as adding erosion control blankets, adding stone at flow entry points, or re-grading where necessary. Accumulation of sediment, litter, or debris Remove and properly dispose of accumulated materials. Make appropriate corrective measures such as adjusting Standing water irrigation system, removing obstructions of debris or invasive vegetation, or minor re-grading for proper drainage. Obstructed inlet or outlet structure Clear obstructions. Damage to structural components such as weirs, inlet Repair or replace as applicable. or outlet structures 2 Kiovanish Residence Treatment BMP Maintenance Plan Maintenance of Biofiltration Only BMPs Access of Structural BMPs for Inspection and Maintenance The Bio-filtration Only BMPs consist of one (1) vegetated areas: IMP A.1-236 ft2 A 1 .5'xl .5' concrete inlet will be installed within the BMP with its rim elevated 10" above the surface. The total depth of the inlet will be approximately 3'. The inlet will be visible from the surface and can be accessed through the grate. The depth will not require a ladder to access the full extent of the inlet. The biofiltration basin is accessible from the front yard of the private residence. . Maintenance Thresholds Any grasses within the biofiltration areas shall be cut when in excess of 4" tall. Debris & sediment shall be cleared from the basin when 2" have accumulated. Any amount sediment or debris accumulation observed within the overflow inlet shall be removed when seen. During routine landscape maintenance activities, if bare areas or erosion are observed they shall be re-seeded. If standing water is observed for longer than 24-hours the soil media shall be inspected for clogging and cleaned. Bioretention Soil Media Replacement Soil media within the bioretention area shall be replaced when the filtration rate drops below 5"/hour if regular maintenance cannot restore this rate. Recommended Maintenance Equipment Equipment needed for maintenance will typically include those needed for routine landscape maintenance: I . Hand Shovels Wheel harrows Lawn mower Hedge clippers I . Other U • Special Training I c Maintenance and inspection activities required are typical for routine landscape maintenance. No special training required. 1 Kiovanish Residence Treatment BMP Maintenance Plan Maintenance of Cistern BMPs Access of Structural BMPs for Inspection and Maintenance The Cistern BMP consists of I system: IMP A.2 - 1,400 ft' Cistern An access port will be installed at the outlet of the cistern. The depth from the surface to the bottom is approximately 2' and will not require a small step latter for safe access should a person need to clean out debris by hand. The access port will be visible from the surface and will be access by removing the lid/cover first. The cistern will be accessible from the front yard Maintenance Thresholds Sediment or debris accumulation within the cistern shall be removed when a 3" depth is observed. If standing water is observed for longer than 24-hours the inletand outlet pipes shall be inspected for blockages. Storage Chamber Replacement Chamber replacement will only be necessary if permanent damage is observed. Permanent damage to chambers will be indicated by caving in of the surface above the system. Recommended Maintenance Equipment Equipment needed for maintenance will typically include those needed for routine landscape maintenance: Truck mounted vacuum Hand Shovels Step ladder Other Special Training Maintenance should only be done by individuals who have received training from the manufacturer or other who have. al ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit [Use the City's standard Single Sheet BMP Plan.] / BMP TABLE BMP ID # BMP TYPE SYMBOL [ CASQA NO. QUANTITY DRAWING NO. SHEET NO(S) INSPECTION FREQUENCY FMAINTENANCE FREQUENCY CONSTRUCTION SIGN OFF TREATMENT CONTROL & HYDROMODIFICATION BIORETENTION AREA TC-32 236 S.F. 503-9A 2 * (SEE BELOW) ANNUALLY © STORM WATER N/A TC-il STORAGE VAULT 1,400 FT. 503-9A 2 * (SEE BELOW) ANNUALLY LOW IMPACT DESIGN (L.I.D.) © ROOF DRAIN TO LANDSCAPING SD-i1 7 EA. 503-9A 2 QUARTERLY ANNUALLY SOURCE CONTROL - ® ® DRAINAGE SYS. MAINTENANCE SC-44 12 503-9A ANNUALLY 2 * (SEE BELOW) FOUNTAIN & POOL MAINTENANCE SC-72 2 503-9A 2 WEEKLY BI-MONTHLY DATE INITIAL REVISION DESCRIPTION DATE INITIAL DATE INITIAL ENGINEER OF WORK OTHER APPROVAL CITY APPROVAL SHEET CITY OF CARLSBAD SHEETS 1 ENGINEERING DEPARTMENT 1 SINGLE SHEET BMP SITE PLAN KLOVANIS J RESIDENCE ADAMS STREET RECORD COPY PROJECT NO. INITIAL DATE [GR2017- 0026 DRAWING NO. IL rr .l:1