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:..~ <br />~,,., <br />(3) Permanent access and access easements required to <br />perform inspection and maintenance of stormwater control <br />structures and stormwater conveyance systems if easements <br />are required by City. The minumnn size of an easement <br />shall be approved by the City Engineer. <br />927.07 STORMWATER STORAGE STANDARDS <br />(a) All materials and components used for the construction of a <br />stormwater storage facility shall conform to the latest version of the <br />UNIFORM STANDARDS FOR SEWERAGE IMPROVII~4IIVTS or other approved standards <br />and, where necessary, shall be designed to support a standard H-20 wheel <br />load if the facility is located under a roadway, drive or parking area. <br />Corrugated metal pipe shall have annular ends with matching <br />bands, gasket joints, and watertight seams. All plate bulkheads over <br />24" in diameter shall be reinforced with external braces and stiffeners. <br />Corrugated metal pipe shall be galvanized or aluminized. <br />Reinforced concrete pipe used for storage facilities shall have <br />premium joints and shall have endwalls or bulkheads designed to resist <br />anticipated loads. <br />Access manholes with access steps shall be provided at each end <br />of an underground storage facility and at intermediate points, if deemed <br />necessary by the City Engineer. The invert elevation of the storage <br />facility outlet and the restrictor pipe shall be aligned in such a <br />manner to eliminate the creation of a sump within the storage facility. <br />Pipe installation methods and bedding materials shall conform <br />to those recommended in the UNIFORM STANDARDS FOR SEWERAGE Il`1PROVEMEIVTS. <br />Retention and detention facilities, other than underground <br />pipes or culverts, shall be considered a special design and are subject <br />to the approval of the City Engineer and Planning Commission. <br />(b) Infiltration basins, also known as stone beds, shall only <br />be approved subject to the following standards: <br />(1) A report shall be submitted from a certified testing <br />laboratory containing sufficient records and data to <br />establish the character of the soil. Such records shall <br />describe the soil conditions found to a depth of at least <br />five feet (5') below the deepest point proposed for the <br />the installation of the stone bed or dissipation wells. <br />The report shall include information regarding the level <br />of the water table and soil permeability. <br />Page - 21- <br />~:. . <br />