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A. Design Requirements <br />1. NPDES Permit design requirements include, but are not limited to, the <br />following: <br />a. Source control, site design, implementation, and maintenance standards <br />when a regulated project (such as a commercial, industrial, residential <br />subdivision, mixed use, or public project) creates and /or replaces 10,000 <br />square feet or more of impervious surface (5,000 square feet for auto <br />service facilities, retail gasoline outlets, restaurants, and uncovered parking <br />lots), including roof area, street, and sidewalk. <br />b. Hydromodification standards when a regulated project creates and /or <br />replaces a total impervious area of one acre or more. <br />c. Compliance with a Diazinon pollutant reduction plan (Pesticide Plan) to <br />reduce or substitute pesticide use with Tess toxic altematives. <br />d. Compliance with a Copper Pollutant Reduction Plan and a Mercury <br />Pollutant Reduction Plan. <br />2. The following requirements shall be incorporated into the project: <br />a. The project developer shall submit a final grading and drainage plan <br />prepared by a licensed civil engineer depicting all final grades and onsite <br />drainage control measures including bioretention swales. Irrigated <br />bioretention swales shall be designed to maximize stormwater entry at their <br />most upstream point. The grading and drainage plans shall be subject to <br />the review and approval of the City Engineer prior to the issuance of a <br />grading or building permit, whichever is sooner. <br />b. In addition to natural controls, the project developer may be required to <br />install a structural control(s), such as an oil /water separator(s), sand filter(s), <br />or approved equal(s) in the parking lot and /or on the site to intercept and <br />pre -treat stormwater prior to reaching the storm drain. The design, <br />location(s), and a schedule for maintaining the separator shall be submitted <br />to the City Engineer /Chief Building Official for review and approval prior to <br />the issuance of a grading or building permit, whichever is sooner. The <br />structural control shall be cleaned at least twice a year (once immediately <br />prior to October 15 and once in January). <br />c. The project developer shall submit to the City Engineer the sizing design <br />criteria and calculations for a hydromodification facility, if required, and for <br />the treatment of stormwater runoff. The design criteria and calculations <br />shall be subject to the review and approval of the City Engineer and shall be <br />22 of 28 <br />