ORD 1933 - Laserfiche WebLink

93. Unless otherwise approved by the City Engineer, the storm drain outfall detail shall be revised as follows: . the minimum size rock within the outfall shall be IA ton; and . the minimum width of the structure shall be 5 feet, and the slope stabilizing geotextile fabric shall extend a minimum of 5 feet on both sides of the outfall structure. 94. The applicant engineer shall submit storm drain hydraulic calculation to verify that the hydraulic grade line does not exceed city design standards. 95. The building shall pads shall be constructed above the loo-year flood elevation as established by Alameda County Flood Control Zone 7. The property shall be graded such that no storm water runs directly to the Arroyo. URBAN STORMW ATER RUNOFF REQUIREMENTS Stormwater Design Reauirements 96. The project shall comply with the Alameda Countywide NPDES Permit #CA5oo29831, a copy of which is available at the City offices 97. 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 bio-swales. Irrigated bio-swales shall be redesigned as needed to the satisfaction of the City Engineer to optimize the amount of the storm water running off the paved surface that enters the bio-swale 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 designs criteria to treat stormwater runoff at the time of plan submittal. c) Landscaping shall be designed to minimize irrigation and runoff, promote surface infiltration where appropriate, and minimize the use of fertilizers and pesticides that can contribute to stormwater pollution. i) Structures shall be designed to discourage the occurrence and entry of pests into buildings, thus minimizing the need for pesticides. 14