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18 <br />000188 <br />impervious surface ratios shall be required as provided <br />in the Table of Tmpervicus Surface Ratios Section <br />6.23.4. D pervious surface calculations for an <br />individual development shall be cumulative for original <br />ccnstruction and any subsequent additions and <br />calculations of bVexvicus surface coverage for <br />individual lots shall include that portion of a right - <br />of -sway between the centerline of the street and the edge <br />the abutting property line of the lot. <br />CFd)nZ = XGNMT(S) : <br />6.24.8 C ol,_off ter -{fit s /2" of Runoff frM =9rVio� bLitfacpB <br />Stoxmwater runoff from ig3arvious surfaces generally carry <br />large amamts of oil, nntrients, metals, bacteria and other <br />pollutants. The Mount of such pollutants in stormwater runoff <br />is closely associated with the lard use from which it <br />originates. An important detenoinant 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 -incb (1/2 ") of runoff from all <br />impervious surfaces in new developments shall be controlled. <br />The purpose of the stoamwater control measure is to reduce off <br />site effects by minimizing clearing, compaction and overall site <br />disturbance, while mmdxdz!M 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 />developmmit as a whole, the applicant mist provide for <br />ma <br />installation and iritecance Of proposed stormvmter management <br />facilities. Applicants shall be required to submit <br />documentation which indicates compliance with the specified <br />standard. <br />An individual let of BO,OOb square feet or more in size created by <br />deed or plat in accordance with orange County S"ivision <br />Regulations prior to the adoption of this provision shall be exempt <br />from this requirement upon submittal of a <br />