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000�8� <br /> impervious surface ratios shall be required as provided <br /> in the Table of Impervious Surface Ratios Section <br /> 6.23.4. Impervious surface calculations for an <br /> individual development shall be cumulative for original <br /> construction and any subsequent additions and <br /> calculations of impervious surface coverage for <br /> individual lots shall include that portion of a right- <br /> of-way between the centerline of the street and the edge <br /> the abutting property line of the lot. <br /> ORDINANCE AMENDMENT(S): <br /> 6.24.8 Control of the First 1/2" of Runoff from Lhmrvious Surfaces <br /> Stormwater runoff from impervious surfaces generally carry <br /> large amounts of oil, nutrients, metals, bacteria and other <br /> pollutants. The amount of such pollutants in stormwater runoff <br /> is closely associated with the land use from which it <br /> originates. An important determinant of water quality is the <br /> increase in impervious surfaces which prevent the natural <br /> infiltration of water into the soil. Most of the pollutant <br /> concentration is carried in the "first flush" of runoff. To <br /> control this pollutant load within the Water Quality Critical <br /> Area the first one half-inch (1/2") of runoff from all <br /> impervious surfaces in new developments shall be controlled. <br /> The purpose of the stormwater control measure is to reduce off <br /> site effects by minimizing clearing, compaction and overall site <br /> disturbance, while maximizing vegetated areas for stormwater <br /> infiltration. Methods to accomplish this standards shall <br /> include, in order of preference: <br /> a. on-site infiltration through the retention of <br /> undisturbed, vegetated areas <br /> b. structural or engineered infiltration measures, such as <br /> trenches or retention ponds, which reduce the amount of <br /> runoff <br /> c. detention structures that reduce the rate of runoff. <br /> Areas to which the standard applies shall include individual <br /> lots or a new development as a whole. If applied to a <br /> development as a whole, the applicant must provide for <br /> installation and maintenance of proposed stormwater management <br /> facilities. Applicants shall be required to submit <br /> documentation which indicates compliance with the specified <br /> standard. <br /> An individual lot of 80,000 square feet or more in size created by <br /> deed or plat in accordance with Orange County Subdivision <br /> Regulations prior to the adoption of this provision shall be exempt <br /> from this requirement upon submittal of a <br />