NOTICE OF PROPOSED ISSUANCE OF AN
ALASKA POLLUTANT DISCHARGE ELIMINATION SYSTEM (APDES) AUTHORIZATION UNDER A GENERAL PERMIT TO DISCHARGE TO
WATERS OF THE UNITED STATES

ADEC Contact:  
Mike Martz
555 Cordova St.
Anchorage, AK 99501
Michael.martz@alaska.gov

Draft Authorization to Discharge Under a General Permit – Public Notice Period:

Notice Start Date: June 6, 2017
Notice Expiration Date: July 6, 2017

Permit No.: AKG250007

Proposed Project and Location:
The City of Unalaska operates the Dutch Harbor Powerhouse. Power generation occurs in an “old” concrete powerhouse, constructed during World War II, and a “new” steel building powerhouse. These power generation facilities are cooled by marine intake water and the water is discharged to Iliuliuk Bay as non-contact cooling water. Temperature is the primary pollutant discharged. The Department is proposing to authorize a mixing zone for temperature (° C) in Iliuliuk Bay. The mixing zone is defined as a rectangle, 52 meters long centered over the point of discharge. The mixing zone has a width extending from the shoreline four meters into Iliuliuk Bay.

The General Permit, Fact Sheet, and proposed authorization are available upon request or can be accessed at the ADEC web site: http://www.dec.state.ak.us/water/wwdp/index.htm

Tentative Determination:
The ADEC has tentatively determined to issue an authorization to discharge under a general permit to the above listed applicant.