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<br />with overall responsibility for administering the National Flood Insurance Program. <br /> <br />(t) FINAL STABILIZATION means established uniform ground cover at a <br />growth density of 80 percent or better. <br /> <br />(u) FREQUENCY STORM means a rainfall event of a magnitude having a <br />specified average recurrence interval and calculated with Natural Resources <br />Conservation Service, USDA Type II twenty-four hour curves or depth-duration <br />frequency curves. <br /> <br />(v) GRADING means earth disturbing activity such as excavation, stripping, <br />cutting, filling, stockpiling, or any combination thereof. <br /> <br />(w) GRUBBING means removing, clearing or scalping material such as roots, <br />stumps or sod. <br /> <br />(x) IMPERVIOUS AREA or IMPERVIOUS COVER means any surface that <br />cannot effectively absorb or infiltrate water. This includes but is not limited to roads, <br />streets, parking lots, rooftops and sidewalks. <br /> <br />(y) INTERMmENT STREAM means a natural channel that may have some <br />water in pools but where surface flows are non-existent or interstitial (flowing through <br />sand and gravel in stream beds) for periods of one week or more during typical summer <br />months. <br /> <br />(z) LARGER COMMON PLAN OF DEVELOPMENT OR SALE means a contiguous <br />area where multiple separate and distinct construction activities may be taking place at <br />different times on different schedules under one plan. <br /> <br />(aa) LANDSLIDE means the mass movement of soil and rock material downhill <br />under the influence of gravity in which the movement of the soil mass occurs along an <br />interior surface of sliding. <br /> <br />(bb) LOCAL COUNTY SWCD means the local county Soil and Water <br />Conservation District. <br /> <br />(cc) NATURAL RESOURCES CONSERVATION SERVICE (NRCS) means an <br />agency of the United States Department of Agriculture, formerly known as the Soil <br />Conservation Service (SCS). <br /> <br />(dd) NPDES PERMIT means a National Pollutant Discharge Elimination System <br />Permit issued by Ohio EPA under the authority of the USEPA, and derived from the <br />Federal Clean Water Act. <br /> <br />l <br /> <br />6 <br />