2003-086 Ordinance - Laserfiche WebLink

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Ordinance No. 2003-86 (2) Grading and construction of terraces and diversions to slow runoff and use of grade control structures to provide a level of control in flow paths and stream gadients; (3) Induced infiltration of increased stormwater runoff into the soil where practical; for example, constructing special infiltration areas where soils are suitable; retaining topsoil for all areas to be revegetated: or providing good infiltration areas wrth proper emergency overflow facilities; and, (4) Provisions for detention and retention; for example, permanent ponds and lakes with stormwater basins provided with proper drainage, multiple use areas for stormwater detention and recreation, wildlife, transportation, fire protection, aesthetics or subsurface storage areas. Any and all such method or methods proposed for controlling increases in stormwater runoff peaks and volumes sha.ll first submitted to the City Engmeer for his review and comment, and may be implemented by the property owner only if first determined by the City Engineer to be reasonable and appropriate, and approved by the City Engineer." SECTION 4: That Section 927.07 of the Streets, Utilities and Public Seivices Code, entitled "Stormwater Storage Standards," which presently reads as follows: "927.07 STORMWATER STORAGE STANDARDS. (a) All materials and components used for the construction of a stormwater storage facility shall conform to the latest version of the IJNIFORM STANDARDS FOR SEWERAGE IlVIPROVEMENTS or other approved standards and, where necessary, shall be designed to support a standard H-20 wheel load if the facility is located under a roadway, drive or parking area. Corrugated metal pipe shall have annular ends with matching bands, gasket joints, and watertight seams. All plate bulkheads over 24" in diameter shall be remforced with externa.l braces and stiffeners. Corrugated metal pipe shall be galvanized or aluminized. Reinforced concrete pipe used for storage facilities shall have premium joints and shall have endwalls or bulkheads designed to resist anticipated loads. Access manholes with access steps shall be provided at each end of an underground storage facility and at intermediate points, if deemed necessary by the City Engineer. The invert elevation of the storage facility outlet and the restnctor pipe shall be aligned in such a manner to eliminate the creation of a sump within the storage facility. Pipe installation methods and bedding materials shall conform to those recommended in the UNIFORM STANDARDS FOR SEWERAGE IMPROVEMENTS. Retention and detention facilities, other than underground pipes or culverts, shall be considered a special design and are subject to the approval of the City Engineer and Planning Commission. (b) Infiltration basins, also known as stone beds, shall only be approved subject to the following standards: (1) A report shall be submitted from a certified testing laboratory containing sufficient records and data to establish the character of the soil. Such records shall describe the soil conciitions found to a depth of at least five feet (5) below the deepest point proposed for the installation of the stone bed or dissipation wells. The report shall include information regarding the level of the water table and soil permeability. 16