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193 <br /> WROPOSED ORDINANCE AMENDMENT(S) : <br /> 6.23.4 REVISE Imoervi_ous Surface Ragut _f t�rotected Watersheds <br /> An impervious surface is a surface composed of any material <br /> which impedes or prevents the natural infiltration of water <br /> into the soil. Such surfaces shall include any concrete or <br /> asphalt surface. These would include, but not be Limited <br /> to,- streets. and parking areas, sidewalks, patios and <br /> structures which- cover the Land. As a ,watershed becomes <br /> developed the amount of impervious surface increases causing <br /> a decrease in soil absorption of stormwater runoff and an <br /> increase in direct runoff to streams and other water bodies <br /> resulting in an increase in potential water pollution . <br /> In order to promote infiltration of stormwater runoff into <br /> the soil and to minimize direct and immediate runoff into <br /> streams and water supply impoundments, impervious surface <br /> ratios shall be required as provided in the Table of <br /> Impervious Surface Ratios Section 6.23.4. Impervious <br /> surface calculations for an individual development shall be <br /> cumulative for original construction and any subsequent <br /> additions and calculations of impervious surface coverage <br /> for individual Lots shall include that portion of a right-- <br /> of' way between the center Line of the street and the <br /> abutting property line of the lot . <br /> EXISTING ORDINANCE PROVISION(S) . <br /> 6 .23.4 Maximum Impervious Surface Ratios—Gross Land Area <br /> (SEE ATTACHED TABLE A) <br /> PROPOSED ORDINANCE AMENDMENT(S) : <br /> 6.23.4 Maximum Impervious Surface Ratios <br /> (SEE ATTACHED TABLE B) <br /> EXISTING ORDINANCE PROVISION(S) : <br /> 5.23.7 infiltration of the First 1/2 Inch ofa Runoff free Impervious <br /> Surfaces <br /> Stormwater runoff carries large amounts of oil, nutrients, metals , <br /> bacteria and other pollutants. The ability of stormwater runoff is <br /> closely associated with the land use from which it originates. The <br /> most significant factor is the increase of impervious surfaces <br /> which prevent the natural infiltration of water in to the soil . <br /> Most of the pollutant concentration is carried in the "first flush" <br /> of runoff. To control this pollutant Load within the Water Duality <br /> Critical Areas the first half—inch of runoff from all impervious <br /> surfaces in new developments shall be infiltrated on—site. <br /> Developers shall be required to submit documentation which <br /> indicates compliance with the specified standard. <br />