RES 07087 - Laserfiche WebLink

section shall be two inches (2") of asphalt concrete (A.C.) on a six inch (6") asphalt base (A.B.). The minimum A.C. pavement slope shall be one percent (1%). For pavement slopes less than 1%, the surface runoff shall be carried in a concrete gutter to an acceptable point of discharge. The minimum slope for concrete gutter shall be 0.5%. 82. Six-inch (6") vertical concrete curbs shall be installed between the new parking spaces and the landscaped areas. URBAN STORMWATER RUNOFF REQUIREMENTS stormwater Design Requirements 83. The project shall comply with the Alameda Countywide NPDES Permit #CA50029831, copy of which is available at the City offices. 84. 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. Irrigated bioswales 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 bioswale 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) In addition to natural controls the project developer may be required to install a structural control, such as an oiVwater separator, sand filter, or approved equal on the site to intercept and pre-treat storm water 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. The project developer shall enter into a maintenance agreement for the oil/water separator. c) The project developer shall submit sizing designs criteria to treat stormwater runoff at the time of plan submittal. d) 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. 1) Structures shall be designed to discourage the occurrence and entry of pests into buildings, thus minimizing the need for pesticides. 2) 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. 3) Plant materials selected shall be appropriate to site specific characteristics such as soil type, topography, climate, amount and timing of sunlight, prevailing winds,