Division of Spill Prevention and Response

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Site Report: Kobuk Abandoned Tank Farm


Site Name: Kobuk Abandoned Tank Farm
Address: Kobuk-Dahl Creek Airport Road, Lot 26 Within US Survey 3378, Kobuk, AK 99751
File Number: 480.57.001
Hazard ID: 4615
Status: Active
Staff: Joshua Barsis, 9072697691 joshua.barsis@alaska.gov
Latitude: 66.906000
Longitude: -156.882000
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

Historic petroleum contamination discovered at location of former tank farm. Update 03/01/2008 - up to 300 cubic yards of contaminated material were removed from the site in 2007 and relocated to a stockpile near the Kobuk landfill. This material was tested at an average concentration below 2,000 parts per million (ppm) as diesel range organics (DRO). The intent is to use this material as daily cover in year 2008. The City of Kobuk owns this site and maintained a tank farm prior to the Alaska Energy Authority (AEA) bulk fuel consolidation. Kobuk sought and obtained a Community Development Block Grant (CDBG), from the Department of Commerce, Community and Economic Development (DCCED), to procure a new emergency generator for their community. The site had not been previously assessed, but it was assumed there are historical petroleum impacts that Kobuk would like to address before reusing the site. In addition to the CDBG, the community has also obtained dedicated funds to conduct some cleanup of the site. The site was prioritized for a DEC Brownfield Assessment in 2007.



Action Information

Action Date Action Description DEC Staff
1/31/2007 Brownfield Inventory Received request for DEC brownfield assessment. John Carnahan
5/1/2007 Brownfield Confirmed John Carnahan
7/23/2007 Cleanup Assumed by ADEC Community considered non-viable and unable to address assessment and cleanup. John Carnahan
9/20/2007 Cleanup Plan Approved Received workplan and provided final comments to consultant. Cleanup is targeted toward the most that can be done with available budget, and not specifically closure. John Carnahan
10/26/2007 Final Cleanup Report Reviewed DEC completed letter of no objection to use of site as proposed for a back-up generator. Finding of no significant exposure was sent to Mayor of Kobuk for use in their procurement of CDBG funding. John Carnahan
3/14/2008 Update or Other Action Report entitled "Remedial Action Report, New Backup Generator Site, Kobuk, Alaska" and dated March 6, 2008 was received from SLR International Corporation on March 14, 2008. The report details the removal of approximately 270 cubic yards of contaminated soil from the Kobuk Abandoned Tank Farm in September 2007. The removed soil was stockpiled next to the current Kobuk landfill. Excavation was limited by the existence of an on-site aboveground storage tank that was left in place, and an in-use sewer line that was not disturbed. Nine soil samples were collected from the excavation area; one sample contained benzene above DEC's cleanup limit of 0.02 mg/kg, and four samples contained diesel-range organics (DRO) above DEC's cleanup limit of 230 mg/kg. These soil sample results indicate contaminated soil above cleanup levels was left in place at the Kobuk Abandoned Tank Farm. The 270 cubic yards of stockpiled soil were also tested for contamination. Eight samples were collected. The stockpile samples contained DRO, benzene, toluene, and ethylbenzene above DEC's cleanup levels. Melinda Brunner
3/28/2008 Site Added to Database Site added to the database. Mitzi Read
10/6/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 75664 name: City of Kobuk Former Fuel Tank Farm John Carnahan
2/6/2012 Update or Other Action PM changed from Carnahan to Brunner, per Carnahan. John Carnahan
3/12/2012 Report or Workplan Review - Other Draft document entitled "Work Plan for Stockpile Sampling and Management, Kobuk Abandoned Tank Farm, Kobuk, Alaska" received from Shannon & Wilson, Inc. on 03/07/2012. The draft work plan describes the proposed sampling of approximately 270 cubic yards of stockpiled soil for diesel-range organics and benzene, toluene, ethylbenzene, and xylenes in Kobuk, Alaska. The stockpiled soil is located next to the current Kobuk landfill. The stockpiled soil is from the 2007 cleanup at the Kobuk Abandoned Tank Farm. The stockpile sampling is proposed for Summer 2012. Comments on the draft work plan returned to Shannon & Wilson by Brunner on 03/12/12. Melinda Brunner
3/29/2012 Site Characterization Workplan Approved Finalized document entitled "Work Plan for Stockpile Sampling and Management, Kobuk Abandoned Tank Farm, Kobuk, Alaska" received from Shannon & Wilson, Inc. and approved by Brunner. The stockpile sampling is planned for Summer 2012. Melinda Brunner
11/13/2012 Report or Workplan Review - Other Draft letter report entitled, "Stockpile Sampling and Management, Kobuk Abandoned Tank Farm, Kobuk, Alaska; ADEC Hazard ID 4615" received from Shannon & Wilson on 11/07/2012. The draft report describes the stockpile sampling and backup generator site reconnaissance done in Kobuk by Shannon & Wilson at DEC's request in August 2012. Lab results show the stockpile still contains diesel range organics above DEC's cleanup levels, with found concentrations ranging from 186 to 3,640 mg/kg. Brunner reviewed the draft letter report, and returned comments to Shannon & Wilson on it on 11/13/2012. Melinda Brunner
1/8/2013 Report or Workplan Review - Other Brunner reviewed and approved Shannon & Wilson's letter report dated November 20, 2012 regarding the sampling of soil taken from the Kobuk Abandoned Tank Farm and stockpiled in 2007. The report describes the stockpile sampling and backup generator site reconnaissance done in Kobuk by Shannon & Wilson at DEC's request in August 2012. Lab results show the stockpile still contains diesel range organics above DEC's migration-to-groundwater cleanup levels, with found concentrations ranging from 186 to 3,640 mg/kg. These concentrations are, however, below DEC's cleanup levels for direct contact and inhalation. Melinda Brunner
1/9/2013 Update or Other Action Letter sent to Mayor Edward Gooden, Jr. of the City of Kobuk transmitting two copies of Shannon & Wilson's report dated November 20, 2012 regarding the results of sampling done on the stockpiled soil from the Kobuk Abandoned Tank Farm. The stockpiled soil is located next to the Kobuk dump. The letter explains that the detected contaminant concentrations in the stockpiled soil were still above DEC cleanup levels as of 2012, and asks the City to contact DEC by February 28, 2013 to discuss further management of the stockpile. Melinda Brunner
8/20/2014 Update or Other Action Sent a letter on this day requesting an update on the soil stockpile and to discuss future management. Joshua Barsis
6/15/2015 Report or Workplan Review - Other Reviewed the Contaminated Soil Stockpile Sampling report, dated June 9, 2015. Five soil samples were collected from between 1.5 and 1.7 feet below the surface of the contaminated stockpile, and were submitted for DRO analysis only. The stockpile is located just outside the Kobuk landfill and measured roughly 55 feet long, 25 to 30 feet wide, and between 2 and 6 feet deep. The southern portion of the stockpile was around 2 feet deep, while the northern portion was around 6 feet deep. Soil samples results ranged between 144 mg/kg and 927 mg/kg DRO. Joshua Barsis

Contaminant Information

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Description Details

There are no documents for this site report.