28-14 Amend Chp. 1339 Storm Water Mgmt

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county that the project is located in. Anti -seep collars shall be provided for all pipe conduits through an embankment. (1) Safety Features: (1) The primary spillway opening shall not permit access to the public and other non - maintenance personnel. (2) The perimeter of all water pool areas that are deeper than three feet shall be surrounded by benches that meet the following: A. A safety bench, with a maximum slope of 3 percent, which extends outward, on dry land, from the shoreline. This bench will be a min- imum of 25 feet wide to provide for the safety of individuals and maintenance vehicles that are adjacent to the water pool. The safe- ty bench may be landscaped, without the use of structures, to pre- vent access to the water pool. B. Side slopes between the safety bench and the aquatic bench shall not be steeper than 3:1 (three feet horizontal for every one foot ver- tical). C. An aquatic bench that extends inward fi-om the shoreline far enough to ensure public safety and has a maximum depth of 15 inches below the normal water surface elevations. The aquatic bench may be landscaped to prevent access to the deeper water pool. The aquatic bench may also be incorporated into the post - construction water quality plan. D. Side slopes beyond the aquatic bench and below the permanent water level shall not be steeper than 2:1 (two feet horizontal for every one foot vertical). E. The contours of the pond will be designed and managed to elimi- nate drop -offs and other hazards. Side slopes getting to the pond shall not exceed 3:1 and shall terminate on a safety bench. (in) Water Quality Basin: If a water quality basin is needed and cannot be incor- porated into an existing or planned detention or retention basin then a sepa- rate water quality basin will need to be planned, designed, constructed and maintained into perpetuity. Water quality basins will not be constructed in any permanent or intermittent stream channel. (n) Flexibility: These standards are general guidelines and shall not limit the right of the city engineer to impose at any time additional and more strin- gent requirements nor shall the standards limit the right of the city engineer to waive, in writing, individual requirements. If the city engineer waives, in writing, individual requirements the owner will provide the city engineer with the information and documentation required to assure Ohio EPA that the waived requirement will not degrade water quality. (r) Redevelopment Projects: Sites that have been previously developed where no post - construction BNIPs were installed shall either ensure a 20 percent net reduction of the site impervious area, provide for treatment of at least 20 percent of the WQv, or a combination of the two. A one - for -one credit to- wards the 20 percent net reduction of impervious area can be obtained 65