NPDES Permits Potentially Affecting Water Quality
Final NPDES Wastewater Permits - Issued by Oregon Department of Environmental Quality
This list consists of permit documents* (see end) made available by Oregon DEQ and is not all inclusive. All documents are PDF except where indicated.
Brookings Sewage Treatment Plant (STP): Final NPDES Wastewater Permit Related Documents
Brookings STP - Final Permit (November 2011) to expire in 2016. This document is also provided as permit in html format*.
Brookings STP - Final Permit - Modification May 14, 2012.
Brookings STP - Final Fact Sheet (April 2011) complementary to the 2016 permit. This document is also provided as fact sheet in html format*.
Waterbody: Pacific Ocean at about 500 feet offshore and east of Chetco Point. Discharge located in coastal tidal region affected by the Pacific Ocean.
Acute Mixing Zone: 30-foot radius about a 72-foot long multiport diffuser. See Fact Sheets from 1999 and 2011.
Acute Mixing Zone Surface Area: Estimated SA is 7,147.4 square feet.
Acute Mixing Zone Volume: The previous DEQ fact sheet (1999) indicates a minimum depth of about 10 ft above the multiport diffuser so the Acute MZ volume is approximately 71,474 cubic feet (i.e., 0.535 million gallons).
Chronic Mixing Zone: 300-foot radius about a 72-foot long multiport diffuser.
Chronic Mixing Zone Surface Area: Estimated SA is 325,943 square feet.
Chronic Mixing Zone Volume: The previous DEQ fact sheet (1999) indicates a minimum depth of about 10 ft above the multiport diffuser so the Chronic MZ volume is approximately 3,259,430 cubic feet (i.e., 24.4 million gallons).