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4 . Permanent landscaping and groundcover must be installed <br /> as soon as practical after construction activities are <br /> completed , <br /> 5 . Temporary groundcover must be used for fill material <br /> subject to erosion and on construction projects over six <br /> months duration , <br /> For the purpose of complying with the above standards , each <br /> comprehensive site development plan must be accompanied by an <br /> erosion control plan prepared to meet the specific <br /> requirements and standards contained in the Orange County <br /> Erosion & Sediment Control Ordinance and Manual . <br /> SLOPE GRADING STANDARDS <br /> Minimum Maximum <br /> Site Area Slope Slope <br /> Planting areas 2% 3111 <br /> Parking lot 2 % 4% <br /> pavement <br /> Driveways access 2 % 5 � <br /> drives <br /> Pedestrian areas <br /> Large plaza areas 1 % 2X <br /> Sidewalks 1 % 8X <br /> Stormwater Management <br /> The purpose of stormwater Management criteria is to reduce <br /> stormwater runoff and improve water quality . It is the <br /> intent of these criteria to protect sensitive areas of a site <br /> from development , to reduce the impacts of development on <br /> steeply sloped sites , to require appropriate storm water <br /> management , and to minimize mass surface grading which <br /> destroys the character of the landscape . <br /> In all ED Districts within a designated water supply <br /> watershed , the first half - inch of stormwater runoff from <br /> impervious surfaces shall be controlled . This may be <br /> accomplished by : <br /> 1 . Preserving undisturbed vegetated areas for on - site <br /> infiltration of runoff , particularly sensitive areas <br /> around wetlands and wader bodies . <br /> 2 . Where soils permit , installing grass swales , trenches , <br /> and retention ponds to increase infiltration capacity . <br />