General Storm Water NPDES Permit for Industrial Activities
On April 5, 2017, the Illinois Environmental Protection Agency issued an updated General Storm Water NPDES Permit for Industrial Activities - 20170405-NPDESIndustrial.pdf.
The revised permit requires quantitative storm water sampling within 180 days of permit reissuance date by developing a written dampling plan for the collection and monitoring of samples to meet performance standards. The written sampling plan must be included in the revised Storm Water Pollution Prevention Plan (SWPPP).