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optimize the amount of the stormwater running off the paved surface that <br />enters the bio -swale at its most upstream end. This plan shall be subject <br />to the review and approval of the City Engineer prior to the issuance of <br />any building permits. <br />b) In addition to natural controls the project developer may be required to <br />install a structural control, such as an oil /water separator, sand filter, or <br />approved equal (on -site) to intercept and pre -treat stormwater prior to <br />reaching the storm drain. The design, locations, and a schedule for <br />maintaining the separator shall be submitted to the City Engineer /Chief <br />Building Official for review and approval prior to issuance of building <br />permits. 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 sizing design criteria to treat <br />stormwater runoff and for hydromodification, if required, at the time of <br />PUD plan submittal and an updated detailed copy of calculations with <br />subsequent submittals. <br />d) Landscaping shall be designed to minimize irrigation and runoff, promote <br />surface infiltration where appropriate and acceptable to the project soils <br />engineer, and minimize the use of fertilizers and pesticides that can <br />contribute to stormwater pollution. <br />I. Structures shall be designed to prohibit the occurrence and entry of <br />pests into buildings, thus minimizing the need for pesticides. <br />II. Where feasible, landscaping shall be designed and operated to treat <br />stormwater runoff. In areas that provide detention of water, plants that <br />are tolerant of saturated soil conditions and prolonged exposure to <br />water shall be specified. Soil shall be amended as required. (See <br />planting guide line by Alameda County Clean Water Program.) <br />III. Plant materials selected shall be appropriate to site specific <br />characteristics such as soil type, topography, climate, amount and <br />timing of sunlight, prevailing winds, rainfall, air movement, patterns of <br />land use, ecological consistency and plant interactions to ensure <br />successful establishment. <br />IV. Landscaping shall also comply with City of Pleasanton ordinances and <br />policies regarding water conservation. <br />e) Roof drains shall discharge and drain away from the building foundation. <br />Ten percent of the stormwater flow shall drain to landscaped area or to an <br />unpaved area wherever practicable. <br />B. Construction Requirements <br />23 of 27 <br />