NPDES Permits Potentially Affecting Water Quality
Final NPDES Wastewater Permits - Issued by Washington Department of Ecology
This list consists of permit documents* (see end) made available by Washington Ecology and is not all inclusive. All documents are PDF except where indicated.
Steelscape, Inc. Industrial Waste (IW) Discharge: Final NPDES Wastewater Permit Related Documents
Permitted Mixing Zone Size for Toxicity:
Waterbody: Columbia River at about River Mile (RM) 72.2.
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Acute Mixing Zone: 9.7 meters (32 feet) downstream.
Acute Mixing Zone Surface Area: Cannot estimate SA at this time because MZ width not given by Ecology.
Chronic Mixing Zone: 97 meters (318 feet) downstream and 30 meters (98.4 feet) upstream.
Chronic Mixing Zone Surface Area: Cannot estimate at this time because MZ width not given by Ecology.
Chronic Mixing Zone Volume: Cannot estimate volume at this time because MZ width not given by Ecology.
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