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4 <br /> (24) "Pollution-generating hard surface (PGHS)" shall mean those hard surfaces considered to be <br /> a significant source of pollutants in stormwater runoff. See the listing of surfaces under <br /> pollution-generating impervious surface. <br /> I (4425)"Planned Residential Development" shall mean a land development project <br /> comprehensively planned as an entire via a single site plan which permits flexibility in <br /> building siting, (lot size, setback lines, etc.), mixture of housing types, useable open space <br /> and preservation of sufficient natural feature. <br /> I (4-526) "Pollutant-generating Impervious Surface (PGIS)" shall mean those impervious surfaces <br /> considered to be a significant source of pollutants in stormwater runoff. Such surfaces <br /> include those which are subject to: vehicular use; industrial activities (as defined in the <br /> City's stormwater management manual); or storage of erodible or leachable materials, <br /> wastes, or chemicals, and which receive direct rainfall or the run-on or blow-in of rainfall; <br /> metal roofs unless they are coated with an inert, non-leachable material (e.g., baked on <br /> enamel coating); or roofs that are subject to venting significant amounts of dusts, mists, or <br /> flumes from manufacturing, commercial, or other indoor activities. - --•- - - . • • - <br /> . _ , - - . : - ., L.4 - . .. . - . <br /> considered to be PGIS unless they are coated with an inert, non leachable material (e.g., <br /> driveways,parking lots, unfenced fire lanes, vehicular equipment storage yards, and airport <br /> runways. <br /> 63 <br /> 12 <br />