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Site Report: Central Alaska Utilities Site

Site Name: Central Alaska Utilities Site
Address: 6 Miles West of Tyonek, Tyonek, AK 99682
File Number: 2337.38.006
Hazard ID: 451
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.071111
Longitude: -151.317500
Horizontal Datum:NAD83

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

Leaking drums and stained soil are present on the site. Contaminants appear to be DRO, RRO and some VOCs. About 18 drums of dark used oil are scattered around the abandoned electrical generation facility. Many have leaked and have been shot. This is a remote location. The site is an abandoned power plant and perimeter support area. EPA START assessment was done in 1999. While Tyonek Native Corporation (TNC) is willing to do work to clean up the site, questions over who is actually responsible and finances have held up any assessment or cleanup operations. A letter was sent to the TNC about the spill, offering ADEC's assistance. Chugach Electric Association, Inc. (CEA) may also be a PRP. The site was inspected on 5/10/95 with Mr. Carl Harmon of CEA. An unmaintained dirt airstrip is adjacent to the site. Location of site: West side of Cook Inlet. 6.2 Main Haul Road, north to airstrip, turn east and go for 1/2 mile.

Action Information

Action Date Action Description DEC Staff
8/19/1988 Preliminary Assessment Approved Seagren and Lockwood located site and noted 12 or more barrels, some full and some leaking, which appear to contain oil. There is an abandoned building at the site, which appears to have been a power plant. An airstrip is located adjacent to the site, which was recently oiled. No surface oiling permit issued by DEC. Donald Seagren
8/23/1988 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). Kegler and Lockwood flew by rental aircraft to Granite Point drum site and walked to power house area. 16 drums were observed, most of which appeared to contain oil or some material. There was oil soaked soil around the drums and also some oily patches around the power house structure. Much of the soil in the area appeared to have been disturbed in the past several years. Samples obtained from 7 of the drums on 8/24/88. 6 drums contained a black oil, and the seventh a yellowish oil. Only the yellowish oil indicated > 50 ppm PCBs with the CHLOR-N-OIL screening kit. The yellowish oil was to be sent to a lab for confirmation. Al Kegler
12/6/1990 Site Ranked Using the AHRM Initial ranking. Former Staff
1/1/1992 Site Added to Database Site added to database. Site added as Reckey 1994230129201 on 7/6/95, but that action combined with this one. Former Staff
10/19/1994 Update or Other Action Site inspection with Tom Harris, CEO, Tyonek Native Corporation (TNC). Donald Seagren
10/27/1994 Update or Other Action Received letter from TNC with information on CEA's activity at the site. Donald Seagren
4/5/1995 Update or Other Action Sent letter to Carl Harmon, Chugach Electric, as a follow-up to telephone conversation, requesting information on CEA's use of the site and documentation on how they left site. Donald Seagren
5/10/1995 Update or Other Action (Old R:Base Action Code = RECN - Site Reconnaissance (CS)). A site inspection was conducted with a representative of Chugach Electric Association, Inc. who is presently considered a potentially responsible party. Donald Seagren
7/3/1995 Update or Other Action Received response from CEA concerning their use of the site. Donald Seagren
7/10/1995 Update or Other Action Sent letter to TNC concerning information received from CEA. Donald Seagren
10/5/1995 Update or Other Action Sent a copy of the CEA information to TNC at their request. Donald Seagren
10/12/1995 Site Ranked Using the AHRM Site reranked. Toxicity and Site Access values changed from 1, Air Exposure Index Value and GW Usage Value changed from 0.1 to their present values. Donald Seagren
11/15/1995 Site Number Identifier Changed Don Seagren indicated that this site was a duplicate of 1994230129201. Site information combined. Donald Seagren
7/1/1999 Update or Other Action Received and reviewed EPA START report of site Donald Seagren
11/3/1999 Site Ranked Using the AHRM Changed Toxicity from 2.1 to 3; Quantity Value from 2 to 2.1; GW Usage Value from 0.4 to 0.1; GW Exposure Index Value from 0.4 to 0; and SW Environments from 2 to 0. Donald Seagren
2/11/2004 Update or Other Action File number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
6/2/2004 Update or Other Action Call from Chad Helgeson, Emerald Environmental. Site is part of gas lease. Well to be drilled on adjacent airstrip. Will be installing utility pole to supply power to drilling operations. Will send report on activities. No soil sampling required. Donald Seagren
8/5/2004 Update or Other Action Reviewed file and sent letter to TNC requesting site status update. Donald Seagren
8/10/2005 GIS Position Updated Using Figure 2-1 and 2-2 from a Central Alaska Utilities Site Tyonek Area Assessments Removal Assessment/Preliminary Assessment Report, from Superfund Technical Assessment and Response Team, dated January 1999, in conjunction with TopoZone Pro, entered the coordinates for this site. Metadata include No Topo Basemap, TopoZone Pro Street Map, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
5/14/2007 Exposure Tracking Model Ranking Donald Seagren
6/12/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. Alyce Hughey
6/3/2009 Update or Other Action File transferred from Soldotna to Anchorage 6-3-09. Project Manager changed from Paul Horwath to Linda Nuechterlein. Alyce Hughey
3/4/2013 Update or Other Action File Transferred from Anchorage to Soldotna. Project manager changed from Grant Lidren to Paul Horwath. Annie Ariel
12/30/2019 Update or Other Action File transferred from Soldotna to Anchorage. Project manager changed from Paul Horwath to Jessica Hall. Jessica Hall
3/31/2020 Workplan Requested Work plan request letter sent to Leo Barlow of Tyonek Native Corporation at 1689 C Street, Suite 219 Anchorage, AK 99501-5131. Jessica Hall
3/31/2020 Potentially Responsible Party/State Interest Letter Potentially Responsible Party/State Interest letter sent to Leo Barlow of Tyonek Native Corporation at 1689 C Street, Suite 219 Anchorage, AK 99501-5131. Jessica Hall
10/2/2020 Update or Other Action Reviewed site file and determined no response had been received from Leo Barlow or Tyonek Native Corp regarding the Workplan request letter sent out in January and March of 2020. Waiting to hear back. Jessica Hall
10/2/2020 Update or Other Action Reviewed site file and determined no response had been received from Leo Barlow or Tyonek Native Corp regarding the Workplan request letter sent out in January and March of 2020. Waiting to hear back. Jessica Hall
10/6/2020 Update or Other Action Per email from David Kroto:Leo is still the CEO for Tyonek Native Corporation. Currently the Central Alaska Utilities site is still on our radar, however due to Covid affecting a number of our operations our response to the Tyonek Village area has slowed even for our own operations. Jessica Hall
2/23/2021 Update or Other Action Checked in on status of Workplan submittal with RP and status of Brownfield Eligibly with ADEC staff. Awaiting response. Jessica Hall
3/22/2021 Update or Other Action Checked in on status of Workplan submittal with RP and status of Brownfield Eligibly with ADEC staff. Awaiting response. Jessica Hall
3/26/2021 Update or Other Action Tyonek Native Corp. stated in email that their consultant will begin preparing the work plan around the first week of April 2021. Jessica Hall
5/3/2021 Update or Other Action The RP just received the draft work plan from their contractor EHX. They will review and send comments back to EHX this week. Jessica Hall
6/16/2021 Document, Report, or Work plan Review - other Sent RP comments on Environmental Site Assessment Workplan Central Alaska Utilities Site – Tyonek, Dated April 2021. Requested an updated work plan be submitted to ADEC. Jessica Hall
10/8/2021 Workplan Requested Review site file and request update for site and request update work plan. Per email from Tyonek Native Corporation, Inc. on 10/8/2021, the work plan is being updated. Jessica Hall
1/5/2022 Document, Report, or Work plan Review - other Reviewed and sent comments to Responsible Party on Environmental Site Assessment Workplan, dated April 2021, received December 31, 2021. Requested updated work plan be submitted to ADEC. Jessica Hall
4/12/2022 Meeting or Teleconference Held Phone call with EHX regarding updates to IDW processing details in the work plan. Jessica Hall
4/15/2022 Risk Assessment Workplan Approved ADEC sent RP approval letter for “Environmental Site Assessment Workplan”, dated February 2022, received via electronic mail April 13, 2022. Jessica Hall
4/27/2023 Site Characterization Report Approved ADEC sent RP approval letter for “Environmental Site Assessment for Central Alaska Utilities Site-Tyonek”, dated July 2022, received via electronic mail April 5, 2023. Site work performed in 2022 located 17 fuel barrels scattered across the site. Most drums were either crushed, burn barrels or located on a concrete pad. Field screening and analytical samples (tested for GRO, DRO, RRO and BTEX) were collected from soil beneath 5 barrels that remained intact. Two analytical samples slightly exceeded DRO cleanup levels (250 mg/kg) with results of 300 and 434 mg/kg. All other detected petroleum contaminants were below cleanup levels. Dawn Wilburn
12/21/2023 Cleanup Complete Determination Issued A cleanup complete determination was issued. Dawn Wilburn
12/21/2023 Institutional Control Record Removed Institutional Controls have been removed. Dawn Wilburn

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby