Industrial Sites and Stormwater
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General Permits No. 1 & 3
General Permit No. 1 is for stormwater discharge associated with industrial activity from businesses primarily engaged in manufacturing, trucking and transportation, construction and mining. General Permit No. 3 is for stormwater discharge associated with industrial activity from asphalt plants, concrete batch plants, rock crushing plants, and construction sand and gravel facilities. Industrial activity is regulated as part of the National Pollutant Discharge Elimination System (NPDES) administered by the EPA.
Summary guidance and the permit language for both General Permit No. 1 and No. 3 can be found here.