ORD 2145 - Laserfiche WebLink

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-site) to intercept and pre-treat stormwater prior to reaching the storm drain. The design, locations, and a schedule for maintaining the separator shall be submitted to the City Engineer/Chief Building Official for review and approval prior to issuance of building permits. The structural control shall be cleaned at least twice a year: once immediately prior to October 15 and once in January. c. The project developer shall submit sizing design criteria to treat stormwater runoff and for hydromodification, if required, at the time of PUD plan submittal and an updated detailed copy of calculations with subsequent submittals. d. Landscaping shall be designed to minimize irrigation and runoff, promote surface infiltration where appropriate and acceptable to the project soils engineer, and minimize the use of fertilizers and pesticides that can contribute to stormwater pollution. I. Structures shall be designed to prohibit the occurrence and entry of pests into buildings, thus minimizing the need for pesticides. II. Where feasible, landscaping shall be designed and operated to treat stormwater runoff. In areas that provide detention of water, plants that are tolerant of saturated soil conditions and prolonged exposure to water shall be specified. Soil shall be amended as required. (See planting guide line by Alameda County Clean Water Program.) III. Plant materials selected shall be appropriate to site specific characteristics such as soil type, topography, climate, amount and timing of sunlight, prevailing winds, rainfall, air movement, patterns of land use, ecological consistency and plant interactions to ensure successful establishment. IV. Landscaping shall also comply with City of Pleasanton ordinances and policies regarding water conservation. e. Roof drains shall discharge and drain away from the building foundation. Ten percent of the stormwater flow shall drain to landscaped area or to an unpaved area wherever practicable. B. Construction Requirements The Construction General Permit's construction requirements include, but are not limited to, the following: Construction activities (including other land-disturbing activities) that disturb one acre or more (including smaller sites that are part of a larger common plan of development) are regulated under the NPDES stormwater program. Operators of regulated construction sites are required to develop and implement a Stormwater Pollution Prevention Plan and to obtain a Construction General Permit (NOI) from the State Water Resources Control Board to discharge stormwater: Case No. PUD — 112/1027 Rose Avenue Planning Commission Page 18