28-14 Amend Chp. 1339 Storm Water Mgmt

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In any case, Temporary or Permanent Stabilization will be properly installed, pursuant to the most recent edition of the Ohio Rainwater and Land Develop- ment manual, before the second building permit is issued. (i) Sediment Settling Ponds: Storm water runoff that exceeds the design capaci- ty of sediment barriers and concentrated storm water flows shall pass through a sediment settling facility. (1) Where storm sewer drainage areas include 10 or more acres disturbed at one time, a temporary (or permanent) sediment settling pond must be provided until final stabilization of the site. In single - family residential construction, final sta- bilization is after the houses are built and permanent landscaping is done. A. Alternative equivalent controls may be used if the owner can show, in writ- ing, that the Ohio EPA approved the use of the alternatives in the Storm Water Pollution Prevention Plan (SWP3) for the site, subject to the approval of the City Engineer. B. It is recommended that for drainage locations of less than 10 acres, smaller sediment settling basins and/or Sediment Traps be used. (2) Each facility's storage capacity shall be no less than sixty-seven (67) cubic yards per acre of total contributing drainage area. The storage volume will be measured from the bottom of the basin to the top of the primary (principal) spillway. (3) Permanent storm water management ponds that are designed to trap sedi- ment during construction shall be designed to provide for a slow release of sed- iment -laden water. The draw down thine shall meet the criteria in the Ohio Rainwater and Land Development manual. (4) The design configuration between inlet(s) and the outlet of settling ponds must provide at least two units of length for each one unit of width (> 2:1 length to width ratio). (5) The depth of the sediment settling pond must be less than or equal to five (5) feet. (6) Sediment must be removed from the sediment settling ponds when the de- sign capacity has been reduced by 40 %. (7) Public safety, especially as it relates to children, must be considered in the design. Alternative sediment controls must be used where site limitations would preclude a safe design. (8) Temporary sediment settling ponds will not be constructed in any stream channel. 0) Storm Sewer Inlet Protection: (1) All storm sewer inlets that accept water runoff from the development area shall be protected so that sediment -laden water will not enter the storm sewer, unless the storm drain system drains to a Sediment Settling Pond and is exempt- ed in writing by the City Engineer. In areas where construction will be ongoing, 16