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Site Report: Akiak Old City Tank Farm and Power Plant


Site Name: Akiak Old City Tank Farm and Power Plant
Address: W Bank of Kuskokwim River, Akiak, AK 99552
File Number: 2402.38.005
Hazard ID: 3370
Status: Active
Staff: Joshua Barsis, 9072697691 joshua.barsis@alaska.gov
Latitude: 60.913550
Longitude: -161.220293
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

The City of Akiak Electric Utility operated this AST farm for the storage and supply of fuel oil for its former power plant. These operations have since been moved to the new consolidated bulk fuel facility in Akiak and to an AST located next to the new power plant. The AST farm is located approximately 1,000 feet from the Kuskokwim River. There is a lined gravel and sand bag dike around the ASTs. There is no fence around this facility. The AST farm consists of two 24,000-gallon, vertical, welded steel, single wall tanks. The ASTs are in fair condition with extensive rust. The ASTs are supported on 12-by-12 inch timbers with 2-by-12-inch planking. ADEC site visit indicates two source areas of contamination: the Old City Power Plant (green generator building) and the Old City vertical ASTS. At the vertical ASTs a spill of 250 gal occurred 7/10/1999. During spill cleanup the liner may have been torn. Extent of cleanup unknown. A soil sample collected on 10/20/2000, at 3.5 feet bgs, on the south side of the AST farm, contained DRO up to 5,700 mg/kg. Contaminated soil and/or stockpile remains at the ASTs evident by analytical, visual and olfactory senses. At the Power plant, more than twenty 55 gal. waste oil drums, a 5 gal. Uncovered waste oil pail, Pools of oil noted on liner, and staining and petroleum odor, were noted during an ADEC site visit on 10/13/1999. The Akiak Native Community, a member village of the Middle Kuskokwim Consortium, which has a Tribal Response Program (brownfield) grant from EPA, applied to DEC's Reuse and Redevelopment (R&R) Program for a DEC Brownfield Assessment (DBA) of the Akiak Old Power Plant, which is located about 200 feet from the old city tank farm. A Brownfield file was set up for work through the R&R Program at this site, the cross-reference number for this file is 2402.57.001.

Action Information

Action Date Action Description DEC Staff
10/13/1999 Site Visit ADEC site visit indicates two source areas of contamination: the Old City Power plant (green generator building) and the Old City vertical ASTs. At the vertical ASTs a spill of 250 gal occurred 7/10/1999. During spill cleanup the liner may have been torn. Extent of cleanup unknown. A soil sample collected on 10/20/2000, at 3.5 feet bgs, on the south side of the AST farm, contained DRO up to 5,700 mg/kg. Contaminated soil and/or stockpile remains at the ASTs evident by analytical, visual and olfactory senses. At the Power plant, more than twenty 55 gal. waste oil drums, a 5 gal. Uncovered waste oil pail, Pools of oil noted on liner, and staining and petroleum odor, were noted. Grant Lidren
1/3/2001 Report or Workplan Review - Other On this date, ADEC received Akiak AST Tank Farm Site Reconnaissance, dated December 2000, submitted by Eco. & Envi, Inc. A soil sample collected on 10/20/2000, at 3.5 feet bgs, on the south side of the AST farm, contained DRO up to 5,700 mg/kg. Grant Lidren
4/17/2003 Site Added to Database DRO contamination. Deborah Williams
4/17/2003 Site Ranked Using the AHRM Preliminary ranking. Deborah Williams
11/29/2006 Update or Other Action Site transferred from Pikul to Jaynes. Aggie Blandford
5/9/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Grant Lidren
12/2/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 74345 name: Old AST Farm Grant Lidren
7/24/2009 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 78799 name: Power Plant Grant Lidren
9/10/2009 Brownfields Award Notice to proceed was awarded to SLR through SPAR term contract. Project managed under Reuse and Redevelopment Program. Deborah Williams
9/28/2009 Site Visit An initial site visit, performed by SLR, was completed on September 28 & 29 2009 before site work scheduled for the week of October 26, 2009. The building, which was impacted by flooding in 2009, contains two generators, two transformers, as least four batteries, 70-five gallon buckets containing petroleum, and the floor was stained. Outside the building a transformer, an old generator, debris and stressed vegetation was noted. Two ASTs, associated with the Old Power Plant were found lying down outside of their containment. No soil staining was noted, but one of the tanks may contain a small amount of petroleum. Grant Lidren
2/17/2010 Update or Other Action Communication with SLR on this date indicates ADEC will receive a draft report for the Property Assessment and Cleanup Plan (PACP) for the Akiak Old City Tank Farm and Power Plant within a week or two. The work for the PACP was completed fall of 2009. Grant Lidren
3/2/2010 Update or Other Action DEC received a draft PACP report for the Akiak Old City Tank Farm and Power Plant. The potential source areas that were identified in the report were the following: The ground beneath and around the ASTs and the fuel pipeline; the west side of the power plant building in the area of a former used-oil storage area where stressed vegetation was observed in 2009; the area beneath and surrounding hazardous materials (consisting of old mechanical devices and other debris, approximately 70 5-gallon waste oil containers, lead-acid batteries, generators, and transformers. Characterization is required at the site to determine the extent of soil and groundwater contamination. Deborah Williams
4/28/2010 Update or Other Action On This date, ADEC received the final report for the PACP Old City Tank Farm and Power Plant Akiak Alaska, submitted by SLR, dated April 2010. Grant Lidren
9/1/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78799 Power Plant. Deborah Williams
12/8/2011 Potentially Responsible Party/State Interest Letter PRP letter sent to the City of Akiak on this date. Grant Lidren
1/20/2012 Update or Other Action ADEC received phone call from the City of Akiak on this date. They plan on having meeting with City to discuss contaminated sites. Grant Lidren
5/10/2013 Site Visit The Solid Waste Program performed a site visit during the week of May 6th.Inside the green old generator building (unlocked and easily accessible) were many 5 gallon buckets of used/waste oil, transformers, equipment, etc. Very noticeable oil smell. Grant Lidren
12/18/2013 Update or Other Action DEC held a meeting with the RP and six tribal council members on Wednesday December 18, 2013. During the meeting, the RP indicated that the old tank farm above ground storage tanks (ASTs) were removed from the site. He also indicated that 2 generators, 5 transformers, 20 batteries, and 47 5-gallon containers (of which approximately 15 contain liquid) were identified on the site and in the power plant building. He mentioned that a small dump truck, excavator, loader, and dozer were available and working in the city of Akiak. The RP and village council is very excited to begin a characterization at this site; however, they have no available funding. They are currently planning on contacting their legislator for funding for site cleanup. Joshua Barsis
11/24/2015 Update or Other Action RP has allocated funding towards the investigation and cleanup of this site. More information to come. Joshua Barsis
5/15/2017 Report or Workplan Review - Other Reviewed the revised Akiak Old City Power Plant and Old City Tank Farm Site Assessment, dated May 12, 2017 for the Akiak Old City Tank Farm and Power Plant site. The purpose of the work is to evaluate four areas of concern (AOCs) that were previously identified; Transformers AOC, Old Power Plant AOC, Old Tank Farm AOC, and Miscellaneous Equipment and Debris AOC. Joshua Barsis
2/26/2018 Update or Other Action Discussion with City of Akiak today. The proposed field effort was completed and SLR has the report prepared. They are working to process some additional paperwork to get the report out. Sent letter on this day requesting that the report be submitted to DEC by April 1, 2018. Joshua Barsis
1/14/2019 Report or Workplan Review - Other Reviewed the Site Assessment Report, dated February 2018 for the Akiak Old City Tank Farm and Power Plant site. The report documents site assessment activities performed at this site in August 2017. Two primary areas of concern were investigated: the old power plant, and the old tank farm. A site inspection inside the old power plant identified five transformers (TR2 through TR6), 42 5-galllon used oil/lubricant buckets, roughly 25 lead-acid batteries, and two abandoned generators. The building was found to be in rough conditions, with perforations in the roof and a decaying wooded floor that was observed to be heavily stained. Rain water that enters through the roof pools onto the wooded floor and is eventually discharged to the soils below the power plant building. One transformer (TR1) was observed outside of the building and appeared to have leaked at one time, as evidenced by staining. Samples of the dielectric fluid were collected from all six transformers to determine is PCBs were present. All transformer oil samples were non-detect for PCBs. Two batteries were observed outside the north wall of the building. Surface soil samples were collected from below the batteries and were submitted for laboratory analysis of lead. Lead was identified in the samples up to 77.9 mg/kg, which is below the applicable cleanup level of 400 mg/kg. Nine test pits were advanced around the perimeter of the power plant. The borings were advanced to a maximum depth of 12 feet below ground surface (bgs). Two samples were collected from each test pit where contamination was observed; one from the most contaminated interval and the second from a deeper internal not apparently contaminated. Diesel range organics (DRO) contaminated soil was present in the top 3 feet of soil up to 8,780 mg/kg, which exceeds the migration to groundwater (MTG) cleanup level of 250 mg/kg, but is below the risk-based ingestion cleanup level of 10,500 mg/kg. All samples collected from deeper intervals were below the most conservative MTG cleanup levels. Nine test pit were also advanced around the former tank farm. Samples were collected in the same way, and from the approximate same depths as described above. DRO was encountered up to 6,960 mg/kg in the upper soil intervals, but was below the MTG cleanup levels in the deeper intervals. Two additional soil samples were collected from below an old discarded generator near the tank farm. No contamination was identified below the old generator. In summary, DRO contaminated soil exists in the surface or near-surface soils above MTG cleanup levels, but below risk-based cleanup levels. Groundwater was not encountered during this investigation, but soil sample results show limited potential migration to groundwater. It should be noted the materials stored in and around the power plant pose a potential future risk to the environment. Joshua Barsis

Contaminant Information

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