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Home My WebLink AboutARCH-0161-2019 20058-SWCP-Application address: 245 Higuera Street San Luis Obispo, CA 93401 phone: (805) 540-5115 web: www.abovegradeengineering.com www.abovegradeengineering.com A California Corporation  Scott Stokes PE # 58256 Storm Water Control Plan For Entry Drive Improvements April 27, 2020 Stormwater Control Plan for Post Construction Requirements Exhibit 4 Application Submittal Where directions state “Done” that means no additional information or forms below that point needs to be filled out or furnished. See Exhibits for Watershed Management Zones, Basins, & Urban Sustainability Areas Use “n/a” where information requested is not applicable. If you are unsure regarding how to fill out any of the information, please come in and request assistance from a staff person. Project Information Step 1 Applicant Name: Application No: Project Name: Location Address: Location APN: Site Zoning: Project Type:  Commercial Detached Single Family Residential Industrial Multi-unit Residential Mixed Use Public Project Phase: Project Description: Total Project Site Area = (a) Total New Impervious Surface Area = (b) Total Replaced Impervious Surface Area = (c) Total Existing Impervious Area = (d) Total Impervious Area of Completed Project = (e) Net Impervious Area: (a+b) – (c-d) = OR where (c-d) is a negative number: (a+b) = Your project is NOT subject to Post Construction Requirements if… Step 2  Area (a+b) of project is < 2,500 square feet – Done OR  Area (a+b) of project is > 2,500 square feet, and is a project type listed below ( type) – Done  Road & parking surface repair – slurry & fog & crack seal, pothole & spot patching, overlay & resurfacing & other damage repair with no expansion  Road & parking shoulder grading  Road & parking cleaning, repairing, maintaining, reshaping, regarding drainage systems  Sidewalk & bike path / lane project – no other impervious surface created and runoff is directed to vegetated area  Curb & gutter improvement or replacement – no other impervious created  Underground utility project – surface replaced in kind  Utility vaults – Ex: lift stations, backflows  Fuel storage – above ground with spill containment  Photovoltaic systems – on existing impervious surface, over pervious surface with vegetated cover, buffer strip at the most down gradient row of panels  Second story – no increase in building footprint  Decks & stairs & walkways – raised with space below for drainage  Temporary structures – in place less than 6 months  Trails and pathways, where no other impervious surfaces are replaced or created, and built to direct stormwater runoff to adjacent vegetated areas. Stormwater Control Plan for Post Construction Requirements Otherwise, your project is subject to the Post Construction Requirements Project Site Details Step 3 Watershed Management Zone: Urban Sustainability Area Name:  Meet USA Conditions  See Area calculations in Step 1 to compare to thresholds in each Step below  Where directions state “Go To”, fill out and attach the referenced Form and any supporting documents Step 4 Project is > 2,500 square feet  Yes ‐ Go To Requirement 1 – Site Design & Runoff Reduction ‐ Form 1 AND THEN Go To Step 5 Step 5 Detached single family residential project where Area (e) is > 15,000 square feet OR Project where Area (e) > 5,000 square feet  Yes ‐ Go To Requirement 2 – Water Quality Treatment ‐ Form 2 AND THEN Go To Step 6  No ‐ Done Step 6 Detached single family residential project where Area (e) > 15,000 square feet OR Project where Area (a+b) > 15,000 square feet AND is in Watershed Management Zone 4,7,10 over a ground water basin OR in Zone 1,2,5,6,8,9  Yes ‐ Go To Requirement 3 – Runoff Retention ‐ Form 3 AND THEN Go To Step 7  No ‐ Done Step 7 Project where Area (a+b) > 22,000 square feet AND is in Watershed Management Zone 1,2,3,6,9  Yes ‐ Go To Requirement 4 – Peak Management ‐ Form 4  No ‐ Done Exhibits 1. Watershed Management Zones 2. Groundwater Basin Location 3. Watershed Management Zone Revision Request 4. Urban Sustainability Conditions and Maps of Approved Areas Stormwater Control Plan for Post Construction Requirements Form 1 Requirement 1 – Site Design and Runoff Reduction: Identify the strategies used to reduce runoff through site design. Strategies 1-5 required. Describe or attach simple plan details for 1. – 5. 1.Limit disturbance of creeks and natural drainage features and setback development from these features. 2.Minimize compaction of highly permeable soils 3.Minimize clearing of native vegetation and grading, conserving natural areas and maximizing undisturbed areas, and developing along natural landforms. 4.Minimize impervious surfaces including roadways and parking lots 5.Do one of the following:  Direct roof run off into cistern, rain barrel, or vegetated area Direct driveway, walkways, patios, and/or parking area into vegetated area Construct surfaces (bike lanes, walks, driveways, parking areas,patios) with permeable surfaces 6.Other (Optional): Identify strategy(s) and describe or show how it will be done in the project. Stormwater Control Plan for Post Construction Requirements Exhibit 1 Watershed Management Zones