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Urban Stormwater Conditions The project shall comply with the NPDES Permit No CAS612008, dated November 19, 2015, and amendments, issued the by California Regional Water Quality Control Board, San Francisco Bay Region, a copy of which is available at the Community Development Department, Public Works/Engineering section at City offices, Alameda County Clean Water Program and at State Water Board (http //www waterboards ca gov/sanfranciscobay/water issues/programs/stormwater/Municipal/i ndex shtml , 'i The project shall comply with the "Construction General Permit" as required by the San Francisco Bay Regional Water Quality Control Board (http //www waterboards ca gov/water issues/programs/stormwater/construction shtml) A. Design Requirements 1 The NPDES Permit design requirements include, but are not limited to, the following a Source control, sight design measures, and design and implementation of stormwater treatment measures are required when commercial, industrial or residential development creates and replaces 10,000 square feet or more of impervious surface, including roof area, streets and sidewalk b Hydro-modification standards are required when a new development or redevelopment project creates and replaces total impervious area of one acre or more c The NPDES Permit requires a proactive Diazinon pollutant reduction plan (aka Pesticide Plan) to reduce or substitute pesticide use with less toxic alternatives d The NPDES Permit requires complying with the Copper Pollutant Reduction Plan and the Mercury Pollutant Reduction Plan 2 The following requirements shall be incorporated into the project a The project developer shall submit a final grading and drainage plan prepared by a licensed civil engineer depicting all final grades and on-site drainage control measures including bioswales Irrigated bioswales shall be redesigned as needed to the satisfaction of the City Engineer to optimize the amount of the stormwater running off the paved surface that enters the bioswale at its most upstream end This plan shall be subject to the review and approval of the City Engineer prior to the issuance of any building permits b The project developer shall submit sizing design criteria to treat stormwater runoff and for hydromodification, if required, at the time of PUD plan submittal and an updated detailed copy of calculations with subsequent submittals c Landscaping shall be designed to minimize irrigation and runoff, promote surface infiltration where appropriate and acceptable to the project soils engineer, and PUD-110, Irby Ranch City Council Page 27 of 31