28-14 Amend Chp. 1339 Storm Water Mgmt

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and Diversions, may receive storm water runoff from areas up to ten (10) acres. Storm water diversion practices alone are not considered a sediment control practice unless those are used in conjunction with a sediment settling pond. (e) All Sediment Control Practices must be capable of pending runoff in order to be considered functional. (f) Clearing and Grubbing will be done in two (2) or more phases. The first phase will include only those locations necessary to install the perimeter soil erosion, sediment and storm water control BWs. After the perimeter controls are in place and functioning, the remaining pinase(s) of clearing and grubbing may continue. (g) Timing of Sediment Trapping Practices: Sediment control practices shall be functional throughout all phases of up slope earth disturbing activity. Settling facilities, perimeter controls and other practices intended to trap sediment shall be implemented prior to grading and within seven (7) days from the start of grubbing. They shall continue to function until the up slope development area is permanently re- stabilized. As construction progresses and the topography is al- tered, appropriate controls must be constructed or existing controls altered to address the changing drainage patterns. (h) Stabilization of Denuded Areas: Disturbed areas must be stabilized as speci- fied in the tables below, or according to the Ohio EPA NPDES Storm Water Permit Rules, whichever is most restrictive: Table 2: Permanent Stabilization Area requiring permanent stabilization Time frame to apply erosion controls Any areas that will lie dormant for one (1) Within seven (7) days of the most year or more recent disturbance Any areas within fifty (50) feet of a Within two (2) days of reaching stream and at final grade final grade Any other areas at final grade Within seven (7) days of reaching than 21 days but less than one (1) year and not final grade within that area Table 3: Temporary Stabilization Area requiring permanent stabilization Time frame to apply erosion controls Any disturbed areas within fifty (50) feet of a Within two (2) days of the most stream and not at final grade recent disturbance if the area will remain idle for twenty -one (21) days or more Disturbed areas that will be dormant for more Within seven (7) days of the than 21 days but less than one (1) year and not most recent disturbance within within fifty (50) feet of a stream the area. Disturbed areas that will be idle over winter Prior to the onset of winter weather Where vegetative stabilization techniques may cause structural instability or are otherwise unobtainable, alternative stabilization techniques must be employed. 15