NOTICE OF REVIEW OF AN

ALASKA POLLUTANT DISCHARGE ELIMINATION SYSTEM (APDES)

PRELIMINARY DRAFT PERMIT

TO DISCHARGE TO WATERS OF THE UNITED STATES

DEC has prepared an APDES preliminary draft permit for the Nikiski Combined Cycle Plant. The Preliminary Draft Permit and associated documents are available to the applicant for a 10-day review. Following the close of the 10-day applicant review period, DEC will prepare a draft permit and fact sheet for a formal 30-day public review period. Public comments will be accepted during the formal 30-day review period. You can access the documents on DEC’s Wastewater Discharge Authorization Program webpage at: https://dec.alaska.gov/water/wastewater/

DEC Contact: Marie Klingman, 610 University Avenue, Fairbanks, AK 99709; 907-451-2101; Marie.Klingman@alaska.gov

Preliminary Draft Permit Review:

Start Date:       April 11, 2024

End Date:        April 24, 2024

Permit Number:        AK0053619

Applicant:

Alaska Electric and Energy Cooperative, Inc. Nikiski Combined Cycle Plant

Mile 21.5 Kenai Spur Highway, Kenai, AK 99611 280 Airport Way, Kenai AK 99611-5280

Proposed Project and Location:

Facility Activity:

Discharge of intermittent, low-volume wastewater from the Nikiski Combined Cycle Plant. The waste stream consists of first-stage reverse osmosis reject and wastewater from water treatment building sinks and floor drains. Discharge shall occur at a daily maximum flow rate of 42,000 gallons per day

Discharge Location:

The Nikiski Combined Cycle Plant discharges into Cook Inlet at 60.6759293’ North latitude and 151.3953853’ West longitude.

Mixing Zones:

Mixing zones are proposed for arsenic, copper, manganese, temperature, and whole effluent toxicity. The chronic mixing zone measures 9.3 meters long and 0.36 meters wide. The acute mixing zone, contained within the chronic mixing zone, measures 2.9 meters long and 0.04 meters wide.