2006-123 Ordinance - Laserfiche WebLink

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Ordinance No. 2006-123 (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 conditions 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. (2) The stone bed shall be located a minimum of twenty feet (20') from any building or ten feet (10') from any property line or sanitary sewer easement. (3) An approved filter fabric shall cover the top and sides of the stone bed. (4) The required volume of the stone bed shall be calculated using approved terms for coefficient of runoff, drainage area, storm intensity and time of concentration. The porosity ratio shall be 0.33 to figure net volume from the gross volume. (5) An observation well shall be required for inspection purposes. The location and diameter shall be approved by the Engineering Department. The observation well shall be as deep as the deepest part of the stone bed. Perforated pipe may be approved for use in an observation well. (6) The infiltration basin shall have a sump pump to discharge excess water to an approved storm sewer or ditch. (c) All storm water flow from the proposed development, including flows from upstream areas passing through, and further including increased flow attributable to changes in time of concentration or changes in the former runoff factor (imperviousness), shall be conveyed to the proper storage facility end outlet for the entire tributary area via a natural channel or pipe/culvert either or both of which shall be improved so as to be of adequate capacity. (d) One foot of freeboard shall be provided in wet ponds above the 100-year storm water level. BE AMENDED, AND, AS AMENDED, SHALL READ IN ITS ENTIRETY AS FOLLOWS: 927.07 STORMWATER STORAGE STANDARDS. Stormwater storage facilities shall be either underground storage facilities, dry or wet ponds or a combination thereof as approved by the City Engineer. Wet ponds (ponds that are designed to retain stormwater to a certain depth) shall be enclosed by a fence in accordance with Chapter 1345. (a) All materials and components used for the construction of a stormwater storage facility shall conform to the latest version of the UNIFORM STANDARDS FOR SEWERAUE IMPROVEMENTS 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 reinforced with external 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 2