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does not comply with the original development plan or has <br />been superseded by state law. <br />(d) The requirements of paragraph (f) of Section 3 will be modified for <br />redevelopment sites at which less than fifty -percent of the total site area <br />(including any road <br />right-of-way) will be disturbed, such that water quality <br />ponding will be required only for the areas being disturbed. <br />(e) Subdivision of land which does not propose <br />construction of impervious surfaces or structures will <br />be exempt from the requirements of Section 3 and <br />paragraphs (c), (g), (h), (i) of Section 4. However, a <br />Rule C permit is required when such future development does occur. <br />(f) Rate control criteria discussed in Section 3 may be <br />waived if the site discharges directly to a water body <br />with large storage capacity (such as a public water) <br />which has a time to peak elevation greater than that for <br />an on site pond and the volume discharged from the on site pond is negligible, <br />relative to the volume of runoff entering the water body. <br />(g) The requirements of paragraphs (e) and (f) of <br />Section 3 may be waived for sites with total impervious <br />area of less than one acre, if infiltration BMP's have <br />been incorporated into the project to the maximum extent possible. <br />(h) The requirements of paragraph (j) of Section 3 may <br />be waived for short duration floods not associated with <br />regulatory (FEMA FIS) floodplain. Low floor elevations <br />will not be allowed below the 100 -year water level, and <br />the two -foot freeboard requirement would apply to the <br />minimum building opening elevation. Additionally, <br />applicant must submit calculations demonstrating the <br />duration of the flood event was sufficiently brief to <br />prevent saturation of the soil at the low floor <br />(i) In cases where structures are proposed below the runout <br />elevation of land -locked basins, the low -floor elevation will <br />be a minimum of two feet above the high water level as <br />determined from an estimate of highwater levels determined <br />from the highest of either the 100 -year, ten-day runoff event <br />,..or back-to-back 100 -year, twenty -four-hour rainfalls. Aerial <br />photos, vegetation, soils, and topography will be used to <br />derive a "normal" water elevation for the basin for purposes <br />of computing the 100 -year elevation <br />