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6l) <br /> *8 .23.5 Minimum o Si R <br /> The minimum lot size for a commercial use in the feet . <br /> Amended Protected Watershed District shall be 80,000 square . <br /> 10/ <br /> 11=19-85 The minimum Lot size for en industrial use shall be <br /> 11-20-84 200,000 square feet . The minimum residential Lot size <br /> shall be determined by the wastewater treatment system <br /> applicable . <br /> 6 .23.8 Industrial Development Regulated, <br /> Amended 11/20/84 <br /> To assure compatible industrial development in the <br /> Protected Watershed II (PW—II) District only Light <br /> industrial uses characterized as low water. users and not <br /> using , producing , storing, consuming or discharging <br /> amounts of hazardous . and toxic substances in excess of <br /> the amounts specified in the EPA Listings are. permittad. <br /> No industrial uses shall be permitted in the portions of <br /> the PW—II District designated as Water Quality Critical <br /> Area. <br /> 10 <br /> 6 .23 .7 I : ti •n • f _ Fi • 1/2 in of Runo from <br /> Impervious Surfaces <br /> Amended 11/19/85 IP <br /> Stormwater runoff from impervious surfaces generally <br /> carry Large amounts of oil, nutrients , metals, bacteria <br /> IP <br /> and other pollutants. The amount of such pollutants in <br /> stormwater runoff is closely associated with the Land <br /> use from which it originates . An important determinant <br /> of water quality is the increase in impervious surfaces IP <br /> which prevent the natural infiltration of water into the <br /> soil. Most of the pollutant concentration is carried in <br /> the "first flush" of runoff. To control this pollutant <br /> Load within the Protected Watershed—II district the <br /> first one half—inch (1/2") of runoff from all impervious <br /> surfaces in new developments shall be controlled . The <br /> purpose of the stormweter control measure is to reduce <br /> off site effects by minimizing clearing , compaction and <br /> overall site disturbance, while maximizing vegetated <br /> areas for stormweter infiltration . Methods to <br /> accomplish this standard shall include, in order of <br /> preference: <br /> a. on—site, infiltration through the retention of <br /> undisturbed, vegetated areas <br /> b . structural or engineered infiltration measures , <br /> such as trenches or retention ponds, which reduce <br /> the amount- of runoff <br /> c . detention structures that <br /> reduce the rate of <br /> runoff. <br /> 6-30 <br />