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• <br /> • <br /> • <br /> • <br /> PROPOSED ORDINANCE AMENDMENT IV : <br /> 1 • <br /> 1 <br /> 6.23.7 Impervious Surfaces <br /> • <br /> Stormwater runoff from impervious surfaces generally carry <br /> larg!e amounts of all, nutrients, meta Ls, bacteria and other <br /> po lutants The amount of such pollutants in stormwater <br /> runoiff is closely associated with the tend use from which it <br /> • origlinates . An important determinant of water quality is the <br /> increase in impervious surfaces which prevent the nature <br /> • infilltration of water into the salt. Most of the pollutant <br /> concentration is carried in the "first flush" of runoff. To <br /> • controL this pollutant Load within the Protected Watershed—II <br /> district the first one ha Lf—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, white 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 /> tar 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 app lies shalt include individual <br /> Lots or a new development as a whole. If app lied to a <br /> development as a who le, the applicant must provide for <br /> insta llation and maintenance of proposed stormwater <br /> management foci liti es. Applicants shall be required to <br /> submit documentation which indicates comp liance with the <br /> specified standard. <br /> An individual lot of 80,000 square feet or more in site <br /> created by deed or p Lat in accordance with Orange County <br /> Subdivision Regulations prior to the adoption of this <br /> provision shall be exempt from 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 /> ofi 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 di rect runoff impacts . <br /> • <br />