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URBAN STORM WATER RUNOFF REQUIREMENTS stormwater Design Requirements 98. The project shall comply with the Alameda Countywide NPDFS Permit #CA5002983 7 , a copy of which is available at the City oftices. 99_ 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 and bioretention ponds_ Irrigated. bioswales and bioretention ponds shall be redesigned as needed to the satisfaction of the City Engineer to optimize the amount of the storm water running of£ the paved surface that enters the bioswale/bioretcntion pond at its most upstrean-t end_ This plan shall be subject to the review and approval of the City Engineer prior to the issuance of any building permits_ b) In addition to natural controls the project developer may be required to install a structural control, such as an oil/water separator, sand filter, or approved equal on the site to intercept and pretreat storm water prior to reaching the storm drain_ The design, locations, and a schedule for maintaining the separator shall be subirtitted to the City Engineer/Director of Building Inspection for review and approval prior to issuance of building permits. The structural control shall be cleaned at least twice a year: once imniedi ately prior to October 7 5 and once in January. The project developer shall enter into a nZaintenaace agreetneni for the oil/water separator. c) The project developer shall submit sizing designs criteria to treat siorn~water runoff at the time of plan subinittal_ d) Landscaping shall be designed to minimize irrigatiott and runoff, pro»>ote surface infiltration where appropriate, and minimize the use of fertilizers and pesticides that can contribute to stormwater pollulion. 1 J Structures shall be designed to discourage the occurrence and entry of pasts into buildings, thus mittimiziug the need fc>r pesticides. 2~ Where feasible, landscaping shall be designed and operated to treat stormwater runoff In areas that provide detention oi' water, plants that are tolerant of saturated soil conditions and prolonged exposure to water shall be specified. Soil shall he amended as required. 3J Plant materials selected shall be appropriate to site specific ch araeteri sties such as soil type, topography, climate, amount and tinting of sunlight, prevailing winds, rainfall, air movement, patterns of land use, ecological consistency and plant interactions to ensure successful establishment. 4J Landscaping shall also comply with City of Pleasanton ordinances and politics regarding water conservation. 74