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• http://www.waterboards.ca.00v/sanfranciscobay/water issues/proqrams/stormwater/M <br /> unicipal/index.shtml <br /> Design Requirements <br /> 166. NPDES Permit design requirements include, but are not limited to, the following: <br /> a. Source control, site design, implementation, and maintenance standards when a <br /> regulated project (such as a commercial, industrial, residential subdivision, mixed <br /> use, or public project) creates and/or replaces 10,000 square feet or more of <br /> impervious surface (5,000 square feet for auto service facilities, retail gasoline <br /> outlets, restaurants, and uncovered parking lots), including roof area, street, and <br /> sidewalk. <br /> b. Hydromodification standards when a regulated project creates andior replaces a total <br /> impervious area of one acre or more. <br /> c. Compliance with a Diazinon pollutant reduction plan (Pesticide Plan) to reduce or <br /> substitute pesticide use with less toxic alternatives. <br /> d. Compliance with a Copper Pollutant Reduction Plan and a Mercury Pollutant <br /> Reduction Plan. <br /> 167. The following requirements shall be incorporated into the project: <br /> a. The project developer shall submit a final grading and drainage plan prepared by a <br /> licensed civil engineer depicting all final grades and onsite drainage control <br /> measures including bioretention swales. Irrigated bioretention swales shall be <br /> designed to maximize stormwater entry at their most upstream point. The grading <br /> and drainage plans shall be subject to the review and approval of the City Engineer <br /> prior to the issuance of a grading or building permit, whichever is sooner. <br /> b. In addition to natural controls, the project developer may be required to install a <br /> structural control(s), such as an oil/water separator(s), sand filter(s), or approved <br /> equal(s) in the parking lot and/or on the site to intercept and pre-treat stormwater <br /> prior to reaching the storm drain. The design, location(s), and a schedule for <br /> maintaining the separator shall be submitted to the City Engineer/Chief Building <br /> Official for review and approval prior to the issuance of a grading or building permit, <br /> whichever is sooner. The structural control shall be cleaned at least twice a year <br /> (once immediately prior to October 15 and once in January). <br /> c. The project developer shall submit to the City Engineer the sizing design criteria and <br /> calculations for a hydromodification facility, if required, and for the treatment of <br /> stormwater runoff. The design criteria and calculations shall be subject to the review <br /> and approval of the City Engineer and shall be submitted prior to the issuance of a <br /> grading or building permit, whichever is sooner. <br /> d. Building/Structures shall be designed to minimize the occurrence and entry of pests <br /> into buildings, thus minimizing the need for pesticides, as determined by the Chief <br /> Building Official prior to the issuance of a building permit. <br /> 25 of 30 <br />