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CDP 15-42; Corbin House; STORMWATER QUALITY MANAGEMENT PLAN; 2016-07-27
• ' t STORMWATER QUALITY MANAGEMENT PLAN (SWQMP) Benjamin R. Lund SWMP 16-24 City of Carlsbad Priority Development Project Corbin House COP 15-42 DWG 495-4A Prepared For: Dale and Debbie Corbin 4398 Yuki Lane Carlsbad, CA 92008 APN: 207-360-55 Prepared By: Ben Lund Engineering 27790 Granite Ridge Rd Escondido, CA 92026 760-410-8171 Date: July 27, 2016 7/27/16 RCE 68849 Date ItECOR.- g:v_ 1nh.ial Date RECEIVED AUG 2 2 2016 LAND DEVELOPMENT ENGINEERING • Table of Contents CERTIFICATION PAGE .................................................................................................................................... 1 PROJECT VICINITY MAP ................................................................................................................................ 2 STORMWATER STANDARD QUESTIONNAIRE (E-34) .................................................................................... 3 SITE INFORMATION CHECKLIST.. ................................................................................................................... 4 STANDARD PROJECT REQUIREMENT CHECKLIST (E-36) ............................................................................. 13 SUMMARY OF PDP STRUCTURAL BMPS ..................................................................................................... 14 ATTACHMENT 1 .......................................................................................................................................... 18 Backup for PDP Pollutant Control BMPs ................................................................................................. 18 Attachment la: DMA Exhibit .................................................................................................................. 20 Attachment 1e: Pollutant Control BMP Design Worksheets I Calculations ........................................... 21 Self-mitigating DMA criteria ............................................................................................................... 21 Self-retaining DMAs via Qualifying Site Design BMPs ........................................................................ 21 ATTACHMENT 2 .......................................................................................................................................... 24 Backup for PDP Hydromodification Control Measures ........................................................................... 24 ATTACHMENT 3 .......................................................................................................................................... 25 Structural BMP Maintenance Information ............................................................................................. 25 Structural BMP Maintenance Thresholds and Actions ........................................................................... 27 ATTACHMENT 4 .......................................................................................................................................... 29 City Standard Single Sheet BMP (SSBMP) Exhibit.. ................................................................................. 29 Project Name: Corbin House Project ID: CDP 15-42 Date: 12/11/15 CERTIFICATION PAGE I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements ofSDRWQCB Order No. R9-2013-0001 (MS4 Permit). I have read and understand that the City of Carlsbad 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 PDP 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 PDP SWQMP by the City of Carlsbad 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. Benjamin R. Lund RCE 68849 Exp. 9/30/17 Date Ben Lund Engineering 1 Project Name: Corbin House Project 10: CDP 15-42 PROJECT VICINITY MAP CITY OF OCEANSIDE .. ~ l • CITY OF l1STA ~-:+ VICINITY MAP NOT TO SCALE 2 STORMWATER STANDARD QUESTIONNAIRE (E-34) (City of Carlsbad STORM WATER STANDARDS QUESTIONNAIRE Development Services Land Development Engineering 1635 Faraday Avenue (760)602-2750 www.ca rlsbadca.gov E-34 I INSTRUCTIONS: To address post-development pollutants that may be generated from development projects, the c1ty 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 v1ew the BMP Manual, refer to the Engineering Standards (Volume 5). This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to 'PRIORITY DEVELOPMENT PROJECT' (PDP) requirements. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you, this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the city. If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff. A completed and signed questionnaire must be submitted with each development project application. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. . . PROJECT INFORMATION PROJECT NAME: Corbin House PROJECT ID COP 15-42 ADDRESS: 4398 Yuki Lane, Carlsbad Ca. 92008 APN: 207-360-55 The project is (check one): 1Z1 New Development D Redevelopment .. ~ The total proposed disturbed area is: 11,520 ft' ( 0 26 ) acres The total proposed newly created and/or replaced impervious area is: 4,866 ft'(011 ) 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 N/A SWQMP#: N/A Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. E-34 Page 1 of 4 REV 02/16 . ,· STEP1 .· .. . .··. .TO BE COMPLETED FOR.ALL PROJECTS . To determine if your project is a "development project", please answer the following question: YES NO - Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building 0 IZl or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)? --If you answered "yes" to the above question, provide justification below then go to Step 5, mark the third box stating "my project is not a 'development project' and not subject to the requirements of the BMP manual" and complete applicant information. Justification/discussion: (e.g. the project includes only interior remodels within an existing building): If 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; 0 IZl b) Designed and constructed to be hydraulically disconnected from paved streets or roads; c) Designed and constructed with permeable pavements or surtaces in accordance with USEPA Green Streets quidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in 0 IZl accordance with the US EPA Green Streets guidance? 3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? 0 IZl ---If you answered "yes" to one or more of the above questions, provide discussion/justification below, then go to Step 5, mark the second box stating "my project is EXEMPT from PDP .. _"and complete applicant information. Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance): If you answered "no" to the above questions, your project is not exempt from PDP, go to Step 3. E-34 Page2of4 REV 02/16 1. Is your project a new development that collectively over the entire project site? and on I 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 land. 3. Is your a new or creates s 5, square 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 code 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 ent includes I on natural slo that is five I 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 i 6. Is your a new or or more of impervious surface collectively over the entire project site and supports a street, road, h1ghway freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface used for the and 7. I 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 to the ESA, or conveyed in a pipe or open channel any distance as an flow from the ESA e. not with flows from • I your a new or I that creates and/or 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: 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 of 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? i imne•vir"'' surface or (2) increases impervious surface on 0 0 0 0 0 0 0 0 0 0 0 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 " is a 'STANDARD PROJECT' ... " and com information. E-34 Page3of4 REV 02/16 ·. . . ·.··••··. .' c . .. , , . ,, · ' · •c > ·. , : • :_ STEP 4 .. . .. . · .. TO BECO~PLETED f'ORREDEVELqf!MENT 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)= Entire Site Considered PDP sq. It D IZl Total proposed newly created or replaced impervious area (B)= sq. ft. Percent impervious area created or replaced (B/A)'1 00 = % II you answered "yes", the structural BMPs required lor 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. II you answered "no," the structural BMP's required lor PDP apply to the entire development. Go to step 5, check the check the first box stating "My project is a PDP ... " and complete applicant information. • ; : >: .·· .. ··.: .. •/ .. · .. ·., . STEPS ·.· ... ·. · .·· ·.· ··.· '•.' CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION IZl 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) lor submittal at time of application. 0 My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT' stormwater requirements of the BMP Manual. As part of these requirements, I will submit a "Standard Project Requirement Checklist Form E-36" and incorporate low impact development strategies throughout my project Note: For projects that are close to meeting the PDP threshold, stall may require detailed impervious area calculations and exhibits to verily if 'STANDARD PROJECT' stormwater requirements apply. D My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual. Applicant Information and Signature Box Applicant Name: Dale Corbin Applicant Title: Owner Applicant Signature: Date: Envtronmentally Sens111ve Areas tnclude but are not hmtted to all Clean Water Act Sectton 303(d) 1mpa1red water bodtes, areas destgnated as Areas of Spec1al 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 I.Mthin the Cities and County of San Diego; Habitat Management Plan; and any other equivalent environmentally sensitive areas \Mlich have been identified by the City. This Box for City Use Onlv YES NO City Concurrence: D D By: Date: Project 10· E-34 Page4of4 REV 02116 SITE INFORMATION CHECKLIST Project Summary Information Project Name Corbin House Project Address 4398 Yuki Lane Carlsbad, CA 92008 Assessor's Parcel Number(s) (APN(s)) APN: 207-360-55 Project ID CDP 15-42 Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area (total area of Assessor's Parcel(s) associated 0.44 Acres (19,040 Square Feet) with the project) Area to be disturbed by the project (Project Area) 0.26 Acres (11,520 Square Feet) Project Proposed Impervious Area (subset of Project Area) 0.11 Acres (4,866 Square Feet) Project Proposed Pervious Area (subset of Project Area) 0.18 Acres (7,707 Square Feet) Note: Proposed Impervious Area+ Proposed Pervious Area= Area to be Disturbed by the Project. This may be less than the Parcel Area. 4 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 l'griE~It~ral or other non impervious use Vacant, undeveloped/natural Description I Additional information: Existing Land Cover Includes {select all that apply): Vegetative Cover Non-Vegetated Pervious Areas Impervious /\reas Description I Additional Information: Underlying Soil belongs to Hydrologic Soil Group {select all that apply): ~JRCS Type A NRCS Type B ~JRCSType C ~JRCS T1'Pe g Approximate Depth to Groundwater {GW): GW !=Jepth < S feet S feet< GW !=lepth < 10 feet 10 feet< GW !=Jepth < 20 feet GW Depth> 20 feet Existing Natural Hydrologic Features {select all that apply): \'Vatercourses ~ Springs 'Netlands None Description I Additional Information: ··--------------------- 5 Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from the site? At a minimum, this description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]: The existing site is composed of a graded pad and dirt driveway. The existing drainage onsite is both natural and urban. Stormwater drains onto the site from the north, northeast, and east. This offsite run- on is captured by a brow ditch and outfalls into rip-rap. The run-on then flows to the south where it exits the site boundary. The majority of the storm water runoff generated by the site drains directly offsite to Yuki Lane but some runoff drains offsite to the south. This cross-lot drainage appears to be historical, minor, and has decreased since the building of the improvements shown on Carlsbad Grading Plan 478-4A. 6 Description of Proposed Site Development and Drainage Patterns Project Description I Proposed Land Use and/or Activities: Proposed improvements consist of a single family residence, secondary dwelling unit, walkway, and driveway. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking Jots, courtyards, athletic courts, other impervious features): Proposed improvements consist of a single family residence, walkway, and driveway. In addition, a secondary dwelling unit (SDU) is proposed per separate CDP permit and not part of CDP 15-42. List/describe proposed pervious features ofthe project (e.g., landscape areas): Proposed pervious features include landscaping and DG driveway. Does the project include grading and changes to site topography? ¥es No Description I Additional Information: Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? ¥es No Description I Additional Information: 7 March 14, 2016 Kyrenne Chua City of Carlsbad 1635 Faraday Ave Carlsbad, CA 92008 BEN LUND C f\1 G I f\i t: E R I ~J G RE: Hydrologic Soil Group Classification for CDP 15-42-Corbin House Ms. Chua, According to the soils letter and report "Re: New development to be located at 4400 Park Drive, Carlsbad, California, subject: Rough Grading As-Graded Report, Ref: Grading Plans forMS 05-02", by Engineering Design Group dated January 23, 2015, the USCS classification of the soils is SW-SM. SW refers to well graded sands and gravelly sands with little to no fines and fall under the hydrologic soil classification of A. SM refers to silty sands or sand-silt mixtures and fall under the hydrologic soil classification of B. Therefore, the hydrologic soil class for the site is B. Respectfully, ~7}~ . ~-t&7t:c:::::-:::::::=::::=.L __ Benjamin R. Lund, PE, PLS Principal Ben Lund Engineering Page 1 of 1 BEN LUND ENGINEERING 27790 GRANITE RIDGE Ro, 92026-(760) 410-8171-BENRLUND@GMAIL.COM ~-------~----~-~---------------~~--·- 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 lnterior parking garages Need for future indoor & structural pest control landscape/Outdoor Pesticide Use Pools, spas, ponds, decorative fountains, and other wate·; 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 Sprinlder Test Water Miscellaneous Drain or Wash '.'later Plazas, sidewalks, and parking lots 8 -- 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 travels westerly towards the public right-of-way (Park Drive) where it eventually enters public storm drain that drains into 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 Agua Hedionda Creek Enterococcus, Fecal Coliform, 2019 Manganese, Phosphorus, Selenium, TDS, Total Nitrogen as N, Toxicity Identification of Project Site Pollutants* *Identification of project site pollutants is only required if flow-thru treatment BMPs are implemented onsite in lieu of retention or biofiltration BMPs (note the project must also participate in an alternative compliance program unless prior lawful approval to meet earlier PDP requirements is demonstrated) -- Identify pollutants expected from the project site based on all proposed use(s) of the site (see BMP Design Manual Appendix B.6): Not Applicable to the Expected from the Also a Receiving Water Pollutant Project Site Project Site Pollutant of Concern Sediment X Nutrients X X c.___ ---~ Heavy Metals X Organic Compounds X Trash & Debris X r-- Oxygen Demanding Substances X X Oil & Grease X Bacteria & Viruses X X Pesticides X ---· 9 Hydromodification Management Requirements Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)? ¥es, RVSFoFHositieatioR FHaRageFHeRI tlow EOA!Fol s!F8El8Fal SMPs Fe~8iFe9. ~Jo, IRe ~Fojeel will sisERDFge F8RO# siFeEII\' lo eJ<istiRg 8RSeFgFo8RS stoFffi SFaiAS siSERa<giRg siFeEII\' to waleF stoFage FeseFvoiFs, lakes, eReloses eFHsayFHeA!s, oF IRe Paeifie OeeaR. 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. ~Jo, !Re ~Fojeet will siseRaFge F8Ro# siFeelly to OR aFea iseRlifies as a~~FO~Fiale foF aR eJ<eFH~lioR B\' IRe WMAA foF !Re waleFsRes iR WRiER IRe ~FOjeel Fesides. Description I Additional Information (to be provided if a 'No' answer has been selected above): The project is exempt from hydromodification requirements per the Hydromodification Analysis for Select Carlsbad Watersheds by Wayne W. Chang, dated September 17, 2015. 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? ¥€5 No, No critical coarse sediment yield areas to be protected based on WMAA maps If yes, have any of the optional analyses presented in Section 6.2 of the BMP Design Manual been performed' 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite 6.2.2 Downstream Systems Sensitiv.1ty to Coarse Sediment 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas On site No optional analyses performed, the project will avoid critical coarse sediment yield areas identified based on WMAA maps If optional analyses were performed, what is the final result? No critical coarse sediment yield areas to be protected based on verification of GLUs onsite Critical coarse sediment yield areas exist but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP. Critical coarse sediment yield areas exist and require protection. The project will implement management measures described in Sections 6.2.4 and 6.2.5 as applicable, and the areas are identified on the SWQMP Exhibit. Discussion I Additional Information: 10 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 hydro modification 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. Not Applicable Has a geomorphic assessment been performed for the receiving channel(s)7 Not Applicable No, the low flow threshold is 0.102 (default low flow threshold) Yes, the result is the low flow threshold is 0.102 Yes, the result is the low flow threshold is 0.302 Yes, the result is the low flow threshold is 0.502 If a geomorphic assessment has been performed, provide title, date, and preparer: Discussion I Additional Information: (optional) 11 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 local codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements. Not Applicable 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. 12 STANDARD PROJECT REQUIREMENT CHECKLIST (E-36) 13 (city of Carlsbad . · ... . ' ., .... Project Name: CORBIN HOUSE Project ID: CDP 15-42 STANDARD PROJECT REQUIREMENT CHECKLIST E-36 ···, . .. ·Project Information DWG No. or Building Permit No.: 495-4A . · . ·. ' .... : ,,, ... ' ... ·· ·., Source Control BMPs .· ' . .· Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov -~ ---- . All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See Chapter 4 and Appendix E.1 of the BMP Design Manual for information to implement source control BMPs shown in this checklist. Answer each category below pursuant to the following. • "Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the Model BMP Design Manual. Discussion/justification is not required. • "No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. • "N/A" means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be provided. :. · · · '· .••. . ' source Control Requirement Applied? SC-1 Prevention of Illicit Discharges into the MS4 ~Yes 0 No 0 N/A Discussion/justification if SC-1 not implemented: ---· -~ SC-2 Storm Drain Stenciling or Signage 0 Yes 0 No ~ N/A Discussion/justification if SC-2 not implemented: NO STORM DRAIN INLETS PROPOSED SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind 0 Yes 0 No ~ N/A Dispersal Discussion/justification if SC-3 not implemented: NO OUTDOOR MATERIALS STORAGE AREAS PROPOSED E-36 Page 1 of 4 Revised 03/16 ... · So!lrce Control Req!lirernent (continued) · . . Applied? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and DYes D No ~ N/A Wind Dispersal Discussion/justification if SC-4 not implemented: NO OUTDOOR MATERIALS STORAGE AREAS PROPOSED SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal DYes D No ~ N/A Discussion/justification if SC-5 not implemented: NO OUTDOOR TRASH STORAGE AREAS PROPOSED 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). D On-site storm drain inlets DYes D No ~ N/A D Interior floor drains and elevator shaft sump pumps D Yes D No ~ N/A D Interior parking garages DYes D No ~ N/A D Need for future indoor & structural pest control DYes D No ~ N/A D Landscape/Outdoor Pesticide Use DYes D No ~ N/A D Pools, spas, ponds, decorative fountains, and other water features D Yes D No ~ N/A D Food service DYes D No ~ N/A D Refuse areas DYes D No ~ N/A D Industrial processes D Yes D No ~ N/A D Outdoor storage of equipment or materials DYes D No ~ N/A D Vehicle and Equipment Cleaning DYes D No ~ N/A D Vehicle/Equipment Repair and Maintenance DYes D No ~ N/A D Fuel Dispensing Areas DYes D No ~ N/A D Loading Docks DYes D No ~ N/A D Fire Sprinkler Test Water DYes D No ~ N/A D Miscellaneous Drain or Wash Water DYes D No ~ N/A D Plazas, sidewalks, and parkinq lots DYes D N"--~ N/A -· For "Yes" answers, identify the additional BMP per Appendix E.1. Provide justification for "No" answers. 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 I 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 Reql.!irEunent I Applied? SD-1 Maintain Natural Drainaqe Pathways and Hydroloqic Features I ~Yes I D No I D N/A Discussion/justification if SD-1 not implemented: SD-2 Conserve Natural Areas, Soils, and Vegetation I ~Yes I D No I D N/A Discussion/justification if SD-2 not implemented: SD-3 Minimize Impervious Area I ~Yes I D No I D N/A Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Compaction I ~Yes I D No I D N/A Discussion/justification if SD-4 not implemented: SD-5 Impervious Area Dispersion I ~ Yes I D No I D N/A Discussion/justification if SD-5 not implemented: E-36 Page 3 of 4 Revised 03/16 . . Source Control. Requirement (continued)· . ·. I Applied'? ... SD-6 Runoff Collection I Ill Yes I 0 No I 0 N/A Discussion/justification if SD-6 not implemented: SD-7 Landscaping with Native or Drought Tolerant Species I IZl Yes I 0 No I 0 N/A Discussion/justification if SD-7 not implemented: SD-8 Harvesting and Using Precipitation I 0 Yes I IZl No LON/A Discussion/justification if SD-8 not implemented: ROOF DRAINS TO SELF-RETAINING AREA E-36 Page 4 of 4 Revised 03/16 SUMMARY OF PDP STRUCTURAL BMPS PDP Structural BMPs All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 ,,f 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 e1anagement (see Chapter 6 of the BMP Design Manual). Both storm water pollutant control and flow coctrol for hydromodification management can be achieved within the same structural BMP(s). PDP structural BMPs must be verified by the local jurisdiction at the completion of construccion. This may include requiring the project owner or project owner1s representative to certify constructio:-~ of the structural BMPs (see Section 112 of the BMP Design Manual). PDP structural BMPs must be maintained into perpetuity, and the local jurisdiction 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 (page 3 of this form) 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). 14 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 or separate. Basin A ("driveway basin") will implement the pervious surface strategy wherein the only impervious area will be concrete wheel strips for cars to drive on top of for the length of the driveway. The driveway near the house will be concrete but will drain into pervious areas in between the concrete wheel strips and landscaping that runs along the south of the driveway. The calculations prove this area would be considered self-retaining. Basin B ("house basin") will implement the pervious surface strategy wherein the only impervious areas will be the roof of the home, and walkway with the pervious area being landscaping. In addition, a secondary dwelling unit (SDU) is proposed per separate CDP permit and not part of COP 15-42. Basin C ("offsite and slope runoff basin") is considered self-mitigating by definition. (Continue on page 2 as necessary.) 15 Ho Structural BMP Summary Information (Copy this page as needed to provide information for each individual proposed structural BMP) Structural BMP ID No. 1-Jq 1=)-1.-~heet No. .-, DWG j - Type of structural BMP: Retention by harvest and use (FlU 1) Retention by infiltration basin (IW' 1) Retention by bieretentien (INc 2) Retention a•f !Jermeaele ~avement (INF 3) Partial retention ay laiofiltration with partial retention (PR 1) Biofiltration (BF ±) !'low thru treatment control included as pre treatment,lferebay for an onsite retentien er biefiltration BMP (provide BMP type(cjeseription and indieate which ensite retention or biofiltration BMP it serves in Eliscussion section eelow) Detention IJOnd or vault for hydromodifieation management Other (describe in discussion section below) Purpose: Pollutant control only Fl•fEiromoEiification centre/ onl)• Combined j3ollutant control and hydromodification control Pre treatment/foreaay for another structural BMP Qther (descriae in Eliscussion section below) Discussion (as needed): Although not considered structural BMPs, the project proposes site design BMPs in lieu of treatment control BMPs as shown on the DMA E><hibit and the SSBMP plan. To summarize, the project proposes to • Maintain natural drainage pathways and hydrologic features (SD-1} @ Conserve natural areas, soils, and vegetation (SD-2) • Minimize impervious area (SD-3) • Minimize soil compaction (SD-4) • Use impervious area dispersion (SD-5) • Runoff collection (SD-6) 0 Landscape with native or drought tolerant species (SD-7} 17 ATIACHMENTl Backup for PDP Pollutant Control BMPs This is the cover sheet for Attachment 1. Indicate which Items are Included behind this cover sheet: Attachment Contents Checklist Sequence Attachment la DMA Exhibit (Required) Included See DMA Exhibit Checklist on the back of this Attachment cover sheet. Attachment lb Tabular Summary of DMAs Showing DMA Included on DMA Exhibit in Attachment ID matching DMA Exhibit, DMA la Area, and DMA Type (Required)* Included as .O.ttaEf\ment lb, separate from DM/\ l"lEAibit *Provide table in this Attachment OR on DMA Exhibit in Attachment la Attachment lc Form 1-7, Harvest and Use Feasibility lncluaed Screening Checklist (Required unless the Not included because the entire project entire project will use infiltration BMPs) will use infiltration BMPs Refer to Appendix B.3-1 of the BMP Design Manual to complete Form 1-7. Attachment ld Form 1-8, Categorization of Infiltration lnEiuded Feasibility Condition (Required unless the ~let inEiuaed aeEause tf\e entire prejeet project will use harvest and use BMPs) 'Nill use i'Jar>.'est ana use BMPs Not included because DCV is not Refer to Appendices C and D of the BMP Design Manual to complete Form 1-8. required to be calculated Attachment le Pollutant Control BMP Design Worksheets Included I Calculations (Required) Refer to Appendices Band E of the BMP Design Manual for structural pollutant control BMP design guidelines 18 Use this checklist to ensure the required information has been included on the DMA Exhibit: The DMA Exhibit must identify: o Underlying hydrologic soil group o Approximate depth to groundwater o Existing natural hydrologic features (watercourses, seeps, springs, wetlands) o Critical coarse sediment yield areas to be protected o Existing topography and impervious areas o Existing and proposed site drainage network and connections to drainage offsite o Proposed grading o Proposed impervious features o Proposed design features and surface treatments used to minimize imperviousness o Drainage management area (DMA) boundaries, DMA ID numbers, and DMA areas (square footage or o acreage), and DMA type (i.e., drains to BMP, self-retaining, or self-mitigating) o Potential poll~tant source areas ana corresponaing requires source controls (see Ceapter q, AppenaiH E.l, ana l'orrn 1 3B) o Structural BMPs (identify location, type of BMP, and size/detail) 19 Attachment la: DMA Exhibit 20 SOURCE CONTROL BMPs lsc-11 PREVENT ILLICIT DISCHARGES INTO THE MS4 SITE DESIGN BMPs lsD-11 MAINTAIN NA TVRAL DRAINAGE PATHWAYS & HYDROLOGIC FEATURES ISD-21 CONSERVE NA TVRAL AREAS, SOILS, & VEGETATION ISD-JI MINIMIZE IMPERVIOUS AREA ISD-41 MINIMIZE SOIL COMPACTION lSD-51 IMPERVIOUS AREA DISPERSION ISD-61 RUNOFF COLLECTION ISD-71 LANDSCAPING WITH NATIVE OR DROUGHT TOLERANT SPECIES NOTES 1. GROUNDWATER WAS NOT FOUND AS DEEP AS ~20' ,,Q ,Q" \QQ ,o '--....._7 v / . ® SD-3 SD-4 --SD-5 50-6 SD-7 \ DMA EXHIBIT LEGEND !JIM 5_YAifl.Q~ DMA ( JO' DMA DESICNA TOR 0 0 15' I I I PCC PAVEMENT !.-·· ... ·! " DC ffi:il11.::o GRAPHIC SCALE !" = JO' EX CONCRETE DITCH ""*' ""*' CONTOUR 110 SWALE DRAINAGE PATTERN - Sub-Basin Drainage Area, A Soil Management Area Basin# (sf) Group (DMA) Category A 5,129 s· Self-retaining 8 9,345 s· Self-retaining c 14,996 NA Self-mitigating Total 29,470 • NOTE SECONDARY DWELLING UNIT NOT A PART OF COP 15-42 MAY 10, 2016 l83lElNlLUND ENGINEERING @2016 BEN LUND ENGINEERING-27790 GRANITE RIDGE RO, 92026 -(160) 4/D-8111 -BENRLUNOfiGMAILCO!.I Attachment le: Pollutant Control BMP Design Worksheets I Calculations Self-mitigating DMA criteria Self-mitigating DMAs consist of natural or landscaped areas that drain directly offsite or to the public storm drain system. Self-mitigating DMAs must meet ALL the following characteristics to be eligible for exclusion: • Vegetation in the natural or landscaped area is native and/or non-native/non-invasive drought tolerant species that do not require regular application of fertilizers and pesticides. • Soils are undisturbed native topsoil, or disturbed soils that have been amended and aerated to promote water retention characteristics equivalent to undisturbed native topsoil. • The incidental impervious areas are less than 5 percent of the self-mitigating area. Impervious area within the self-mitigated area should not be hydraulically connected to other impervious areas unless it is a storm water conveyance system (such as brow ditches). • The self-mitigating area is hydraulically separate from DMAs that contain permanent storm water pollutant control BMPs. DMA "C" meets the criteria for self-mitigating designation Self-retaining DMAs via Qualifying Site Design BMPs Self-retaining DMAs are areas that are designed with site design BMPs to retain runoff to a level equivalent to pervious land. BMP Fact Sheets for impervious area dispersion (SD-5 in Appendix E) and permeable pavement (SD-6B in Appendix E) describe the design criteria by which BMPs can be considered self-retaining. DMAs that are categorized as self-retaining DMAs are considered to only meet the storm water pollutant control obligations. Requirements for utilizing this category of DMA: • Site design BMPs such as impervious area dispersion and permeable pavement may be used individually or in combination to reduce or eliminate runoff from a portion of a PDP. • If a site design BMP is used to create a self-retaining DMA, then the site design BMPs must be designed and implemented per the criteria in the applicable fact sheet. These criteria are conservatively developed to anticipate potential changes in DMA characteristics with time. The fact sheet criteria for impervious area dispersion and permeable pavement for meeting pollutant control requirement developed using continuous simulation are summarized below: o SD-5 Impervious Area Dispersion: a DMA is considered self-retaining ifthe impervious to pervious ratio is: • 2:1 when the pervious area is composed of Hydrologic Soil Group A • 1:1 when the pervious area is composed of Hydrologic Soil Group B 21 Self-Retaining Calculations DMA A-Area Dispersion Pavement (SD-5) Area Description Impervious Pervious Check< 1:1 Ratio (Soil Class B) Impervious/Pervious SF 1,994 3,135 0.64 OK Total Area 5,129 Sell-Retaining Calculations DMA A-Area Dispersion Pavement (SD-5) Area Description SF Impervious Homes & Walkway 2,872 Pervious 6,473 Check< 1:1 Ratio (Soil Class B) Impervious/Pervious 0.44 OK Total Area 9,345 23 ATIACHMENTZ Backup for PDP Hydromodification Control Measures This is the cover sheet for Attachment 2. This attachment is empty because the project is exempt from PDP hydromodification management requirements. Indicate which Items are Included behind this cover sheet: '• Attachment Contents Checklist Sequence Attachment 2a Hydromodification Management Exhibit Included (Required) See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. Attachment 2b Management of Critical Coarse Sediment Exhibit showing project drainage Yield Areas (WMAA Exhibit is required, boundaries marked on WMAA Critical additional analyses are optional) Coarse Sediment Yield Area Map See Section 6.2 of the BMP Design Manual. (Required) Optional analyses for Critical Coarse 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 Not performed Channels (Optional) Included See Section 6.3.4 ofthe BMP Design Manual. Attachment 2d Flow Control Facility Design and Structural Included BMP Drawdown Calculations (Required) See Chapter 6 and Appendix G of the BMP Design Manual 24 August 16, 2016 Kyrenne Chua City of Carlsbad 1635 Faraday Ave Carlsbad, CA 92008 RE: Hydromodification Exemption Analysis for CDP 15-42-Corbin House Ms. Chua, In accordance with Order No. R9-2013-0001, issued by the California Regional Water Quality Control Board (Municipal Permit), projects that are subject to Priority Development Project requirements must incorporate: 1) Treatment control best management practices, and 2) Flowcontrol requirements to address potential hydromodification impacts to downstream natural (nonhardened) channels. However, the Municipal Permit includes provisions where a local agency may provide exemptions from hydromodification: Each Copermittee has the discretion to exempt a Priority Development Project from hydromodification management BMP performance requirements of Provisions E.3.c.{2} where the project discharges water runoff to: (i) Existing underground storm drains discharging directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. (ii) 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; Stormwater runoff from the Corbin House project leaves the site via surface flow directly to Yuki Lane and through neighboring lots that drain into Calavo Court. This storm water runoff flows in curb in gutter until it is captured by multiple curb inlets on Park Drive. Underground storm drain conveys this runoff directly to the Agua Hedionda Lagoon. Because the project discharges stormwater runoff to existing underground storm drains that discharge directly to the Agua Hedionda Lagoon, the project is considered exempt from hydromodification management BMP performance requirements. Page 1 of 2 BEN LUND ENGINEERING 27790 GRANITE RIDGE RD, 92026-(760) 410-8171 -BENRLUND@GMAIL.COM The enclosed exhibit shows the project site, the stormwater runoff discharge points, and existing underground storm drain. Principal BenlundEn~neering Enclosures: Hydro mod Exhibit for Corbin Residence Page 2 of 2 BEN LUND ENGINEERING 27790 GRANITE RIDGE RD, 92026-(760) 410-8171 -BENRLUND@GMAIL.COM ACUA Hto!ONDA LAGOON HYDROMOD EXHIBIT FOR Tf'A/ / CORBIN RESIDENCE COP 15-42 AUGUST 16, 2016 lB3rENLUND ENGINEERING f?!'l :Jntll RFN /liNn FNr.JNFF/1/Nf:-?77Qfi r.RANI"ff" 11tnf:F J?n _Q:Jfl'}fl -llllfi) 41fl-R171 -RFN!f'/IJNntr.UA/1 f':f)U ATTACHMENT 3 Structural BMP Maintenance Information This is the cover sheet for Attachment 3. Indicate which Items are Included behind this cover sheet: Attachment Contents Checklist Sequence Attachment 3a Structural BMP Maintenance Thresholds Included and Actions (Required) See Structural BMP Maintenance Information Checklist on the back of this Attachment cover sheet. 25 Structural BMP Maintenance Thresholds and Actions r--·---~· Typical Maintenance lndicator(s) Maintenance Actions for Vegetated BMPs Accumulation of sediment, litter, Remove and properly dispose of accumulated materials, or debris without damage to the vegetation. Poor vegetation establishment Re-seed, re-plant, or re-establish vegetation per original plans. Mow or trim as appropriate, but not less than the design height Overgrown vegetation of the vegetation per original plans when applicable (e.g. a vegetated swale may require a minimum vegetation height). Erosion due to concentrated Repair/re~seed/re-plant eroded areas and adjust the irrigation irrigation flow system. Repair/re~seed/re~plant eroded areas, and make appropriate corrective measures such as adding erosion control blankets, Erosion due to concentrated storm adding stone at flow entry points, or minor re-grading to restore water runoff flow 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. Make appropriate corrective measures such as adjusting irrigation system, removing obstructions of debris or invasive Standing water in vegetated vegetation, loosening or replacing top soil to allow for better swales infiltration, or minor re~grading for proper drainage. 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 bioretention, biofiltration with partial retention, Make appropriate corrective measures such as adjusting or biofiltration areas, or flow~ irrigation system, removing obstructions of debris or invasive through planter boxes for longer vegetation, clearing underdrains (where applicable), or than 96 hours following a storm repairing/replacing clogged or compacted soils. event* Obstructed inlet or outlet Clear obstructions. structure Damage to structural components such as weirs, inlet or outlet Repair or replace as applicable. structures *These BMPs typically include a surface ponding layer as part of their function which may take 96 hours to drain following a storm event. 27 ATIACHMENT4 City Standard Single Sheet BMP {SSBMP} Exhibit 29 PmMARYRE9~MT ~---1 ' / *NOTE SECONDARY DWELLING UNIT NOT A PART OF CDP 15-42 GRAPHIC SCALE I'= 20' BEN LUND ENGINEER I NG 27790 GRAN/IF RIDGE, 92026 -(760} 410-8171 -B£NRWNOf/GMAIL.COI.I S~P NO. 16-24 PARTY RESPONSIBLE FOR MAINTENANCE DALE CORBIN 4280 SKYLINE RO CARLSBAD, CA 92008 760-214-1129 PLAN PREPARED BY:. BEN LUND ENGINEERING 27790 GRANITE RIDGE RD ESCONDIDO, CA 92026 760-410-8171 BMP NOTES: CONTACT DALE CORBIN I. THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER's RECOMMENDATIONS OR THESE PLANS. 2 NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 3. NO SUBSTITUTIONS TO THE MATERIAL OR Ti'PES OR PLANTING Ti'PES 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 SWOMP FOR ADDITIONAL INFORMATION. BMP BMP 10 I BMP Ti'PE SYMBOL ,_, CASOA NO. QUANTITY ., LOW IMPACT DESIGN (LI.D.} ee R?OF DRAIN TO • SO-l/ -LANDSCAPING ---• PERVIOUS ffJI I1•.c1!J TC-10 5,129 SF PAVEMENT (DG} 1 ~111 TABLE .• DRAWING NO. SHEET NO.(S) X; INSPECTION * FREQUENCY -I ANNUALLY ---- Om;' 495-4A 2 LEGEND 11fJ{ SOURCE CONTROL BMPs SYMBOL PCC PAVEMENT 1· ·' I PCC PAVEMENT Rilm!!J PREVENT ILLICIT DISCHARGES INTO THE MS4 SIT£ DESIGN BMPs MAINTAIN NA JURAL DRAINAGE PATHWAYS & HYDROLOGIC FEATURES MAINTENANCE * FREQUENCY ANNUALLY EX CONCRETE 0/TCH = · = CONTOIJR SWAL£ ----!10-·-- lSD-II ISD-21 ISD-JI ISD-4 1 lSD-51 !SD-6 1 ISD-71 CONSERVE NA JURAL AREAS, SOILS, & VEGETATION MINIMIZE IMPERVIOUS AREA DRAINAGE PATTERN - NOTES MINIMIZE SOIL COMPACTION IMPERVIOUS AREA DISPERSION RUNOFF COLLECTION LANDSCAPING WITH NA JIVE OR DROUGHT TOLERANT SPECIES I. GROUNOWA TER WAS NOT FOUND AS DEEP AS ~20' REC.Kf.VED AUG 2 2 2016 LANDDEVE ENGINE~~~~ENT I SH,EET I CITY OF CARLSBAD I SHE,ETS I ~::::::::::::::::~::::::::::::::::~::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::~::::::::::::::::::::~===~~::::::::::::::::t:::::::::::::::: ENGINEERING DEPARThtENT SINCL£ SHEET EJI.IP SITE PLAN CORBIN HOIJSE CDP 15-42 RECORD COPY PROJECT NO. KC. qjql~~ CDP 15-42 DATE INITIAL DATE INITIAL DRAWING NO. OTHER APPROVAL CITY APPROVAL !NmAL OATE 495-4A I DATE INITIAL ENGINEER OF WORK REVISION DESCRIPTION XREFS' CORBIN-MAP: CORBIN-TCPO: CORBIN-BASE l I I I I I I SOURCE CONTROL BMPs jSC-11 PREVENT ILLICIT DISCHARGES INTO THE MS4 SITE DESIGN BMPs ISD-11 MAINTAIN NATURAL DRAINAGE PATHWAYS & HYDROLOGIC FEATURES CONSERVE NATURAL AREAs; SOILs; & VEGETATION MINIMIZE IMPERVIOUS AREA MINIMIZE SOIL COMPACTION IMPERVIOUS AREA DISPERSION RUNOFF COLLECTION SD-21 SD-3 SD-4 SD-5 SD-6 SD-71 LANDSCAPING WITH NATIVE OR DROUGHT TOLERANT SPECIES NOTES 1. GROUNDWATER WAS NOT FOUND AS DEEP AS "'20' SD-4 SD-5 SD-6 SD-3 SD-4 SD-6 SD-1 ® PRIMARY RESIDENCE v 0 15' 30' GRAPHIC SCALE 1" = 30' Basin# A 8 c DMA EXHIBIT LEGEND /TEAl DNA DNA DESIGNATOR PCC PAVEMENT DC SYMBOL EX CONCRETE DITCH CONTOUR SWALE --110 -- ----~(-- DRAINAGE PATTERN Sub-Basin Drainage Area, A Soil Management Area (sf) Group (DMA) Category 5,129 8 Self-retaining 9,345 8 Self-retaining 14,996 NA Self-mitigating Total 29,470 (--.._~ *NOTE SECONDARY DWELLING UNIT NOT A PART OF CDP 15-42 JULY 25, 2016 EN LUND ENGINEERING ©2016 BEN LUND ENGINEERING-27790 GRANITE RIDGE RD. 92026-{760} 410-8171 -BENRLUND@GMAIL.COM