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196 <br /> PROPOSED ORDINANCE AMENOMENT(S) : <br /> 6.25.7 Control of the first 1/2" of Runoff from Impervious 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 <br /> runoff 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 i-s carried in the "first flush" of runoff. To <br /> control this pollutant load within the Protected Watershed—IL <br /> district 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 <br /> site disturbance, while maximizing vegetated areas for <br /> stormwater infiltration . Methods to accomplish this standard <br /> shall 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 <br /> management ' facilities . Applicants shall be required to <br /> submit documentation which indicates compliance with the <br /> specified standard . <br /> An individual Lot of 80,000 square feet or more in size <br /> created. by -deed or plat in accordance with Orange County <br /> Subdivision Regulations prior to the adoption of this <br /> provision shall be exempt fro m this requirement upon <br /> submittal of a site plan which demonstrates that the <br /> development of the property is in accordance with the intent <br /> of this provision to minimize overall site disturbance; <br /> maximize maintenance of vegetated areas for stormwater <br /> infiltration; and protect. critical drainageways and <br /> waterways from direct runoff impacts . <br /> I <br /> II <br />