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This permit authorizes the discharge from oil/ water separators and similar waste water treatment devices whose sole function is the treatment of stormwater or water without detergents or additives used to rinse or wash down pavements. This permit applies to establishments such as vehicle repair shops, transformer stations and pipeline compressor stations.

This permit does not apply to establishments that are required to apply for a permit under the stormwater regulations, found in 10 CSR 20-6.200. The permit does not apply to the discharges of wastewater treatment devices for the treatment of vehicle or equipment wash waters.