28-14 Amend Chp. 1339 Storm Water Mgmt

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iv. Side slopes beyond the aquatic bench and below the perma- nent water level shall not be steeper than 2:1 (two feet hori- zontal for every one foot vertical). v. The contours of the pond will be designed and managed to eliminate drop -offs and other hazards. vi. Side slopes getting to the pond shall not exceed 3:1 and shall terminate on a safety bench. vii. Soil erosion and sediment control practices used to satisfy these standards shall meet the standards and specifications in the current edition of the Ohio Rainwater and Land Develop- ment manual, NRCS field office technical guide for the local county or Ohio EPA guidance, whichever is most stringent. C. These standards are general guidelines and shall not limit the right of the city engineer to impose at any time additional, more strin- gent requirements, nor shall the standards limit the right of the city engineer to waive, in writing, individual requirements. D. Soil limitations shall be determined by using the current edition of the county soil survey written by the NRCS, USDA. E. Methods for controlling increases in storm water runoff peaks and volumes may include, but are not limited to: Retarding flow velocities by increasing friction; for example, grassed road ditches rather than paved street gutters where practical, discharging roof water to vegetated areas, or grass and rock -lined drainage channels. ii. Grading and use of grade control structures to provide a level of control in flow paths and stream gradients. iii. Induced infiltration of increased storm water runoff into the soil, where practical; for example, constructing special infiltra- tion areas where soils are suitable, retaining topsoil for all are- as to be vegetated, or providing good infiltration areas with proper emergency overflow facilities. iv. Provisions for detention and retention, for example, permanent retention ponds and lakes, dry detention basins, and subsur- face detention tanks. (z) Minimum Storm Water Management Design Criteria: (1) The permittee must adhere to all requirements of the current EPA con- struction general permit "post- construction storm water management' section. Specific items of the construction general permit that the per - mittee should be aware of and adhere to include the water quality vol- ume calculation, runoff coefficients based on the type of land use, and target drain times for structural post - construction BMPs. (2) hr addition, the permittee must also adhere to the following items: 51