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Site Report: Chalkyitsik Native Corporation Store Gasoline AST

Site Name: Chalkyitsik Native Corporation Store Gasoline AST
Address: Belle Street & Porcupine Avenue, ~20 Feet East of the CNC Store, Chalkyitsik, AK 99788
File Number: 720.38.003
Hazard ID: 4652
Status: Active
Staff: * Currently Not Assigned, 9072693057 bill.oconnell@alaska.gov
Latitude: 66.653657
Longitude: -143.721771
Horizontal Datum:WGS84

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

Fuel handling practices have resulted in releases of gasoline from a 4,859-gallon aboveground storage tank and accompanying dispenser, as well as a fueling truck used to dispense fuel. Three soil samples collected at 1 foot bgs, next to the gasoline sales dispenser, indicate GRO contamination up to 4,380 mg/kg, benzene up to 42.2 mg/kg, ethylene up to 496 mg/kg, toluene up to 396 mg/kg, and xylenes up to 1,157 mg/kg. Approximately 35 cubic yards of contaminated soil remain on site.

Action Information

Action Date Action Description DEC Staff
4/25/2003 Update or Other Action Chalkyitsik Site Characterization Project Report, submitted by Oasis, with this date. Areas potentially contaminated by fuel at the existing tank farm and various other fuel storage and transfer tanks in the village were targeted for assessment. The goal was to access the amount of fuel contamination present in site soils and groundwater, develop a preliminary evaluation of the risk posed by the contamination, and to develop recommendations regarding how to remediate the sites. Two types of sites were investigated: primary sites including the existing tank farm and secondary sites such as small fuel storage tanks and/or potential spill sites. Multiple sites were found throughout Chalkyitsik with contamination above ADEC cleanup levels. Grant Lidren
6/27/2008 Site Added to Database Site added to the database. Mitzi Read
6/27/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Grant Lidren
12/11/2008 Update or Other Action A communication with Ellen williams of the DEC Drinking Wate Program indicates the public water system for Chalkyitsik Village Water is a Class A water system consisting of 1 source intake(s). The water system is located in Chalkyitsik and the intake for this PWSID is a surface water source. The overall protection area received a susceptibility rating of "very high". In addition, this water system has received a vulnerability rating of "high" for bacteria/viruses, "medium" for nitrates/nitrites, "medium" for volatile organic chemicals, "medium" for heavy metals, "medium" for other organic chemicals, and "medium" for synthetic organic chemicals. Grant Lidren
8/9/2010 Update or Other Action On this date, ADEC sent a fax to Chalkyitsik Native Corporation. ADEC would like to work with the Chalkyitsik Native Corporation to clean up contaminated soil at the gas station. It is possible that the gas station contamination can be addressed during the state-owned CIP mobilization effort at the school and airport during FY11. see file numbers 720.38.001, 720.38.002. and 720.38.004. Grant Lidren
10/1/2010 Update or Other Action On this date, ADEC had a phone conversation with Stephanie Herbert of the CNC. ADEC discussed the possibility of addressing the gas station contamination during the state-owned CIP mobilization effort at the school and airport during FY11 (see file numbers 720.38.001, 720.38.002. and 720.38.004). The ADEC advised Ms. Herbert of the CNC to contact the State’s term contractor; SLR/Hoefler. Grant Lidren
6/15/2011 Site Visit ADEC and SLR performed a site visit on this date. Gas tank is still active. Some fuel staining on the ground was observed. Grant Lidren
12/7/2011 Potentially Responsible Party/State Interest Letter PRP letter sent on this date to CNC Grant Lidren
1/19/2012 Update or Other Action Chalkyitsik Native Corp. contacted ADEC on this date. They plan on having meeting in February to discuss the site. Grant Lidren
12/8/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 75719 Gas AST. Joshua Barsis
2/4/2015 Update or Other Action Sent letter with site history and request for contact. Joshua Barsis
4/8/2015 Public Notice Notice of Environmental Contamination recorded Joshua Barsis
9/14/2015 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 75719 Gas AST. Joshua Barsis
9/15/2015 Document, Report, or Work plan Review - other Reviewed the Site Characterization Report, dated September 10, 2015. The objective of this characterization effort was to determine if petroleum contamination remains above ADEC cleanup levels at this site and to delineate the extent of any remaining contamination. A total of twenty-nine (29) soil samples were collected from 10 hand-augured soil borings positioned around the gasoline dispensing island and above ground storage tank (AST). An additional surface soil sample was collected from a test pit located south of the AST for the purpose of investigating stained surface soil associated with a 55-gallon drum partially filled with a water and oil mixture. All surface and subsurface soil samples were field screened using headspace screening methodology and a photoionization detector (PID). Based on PID results, visual evidence, and olfactory signs of contamination, 4 soil samples were submitted for laboratory analysis of gasoline range organics (GRO), and benzene, toluene, ethylbenzene, and xylenes (BTEX). In addition, one soil sample collected from the test pit was also analyzed for diesel range organics (DRO). Laboratory results revealed that contamination remains in the subsurface soils above ADECs maximum allowable cleanup levels. The maximum remaining concentrations in the subsurface soils are as follows: 7,530 mg/kg GRO, 82 mg/kg benzene, 1,130 mg/kg toluene, and 1,261 mg/kg total xylenes, all of which exceed ADECs maximum allowable cleanup levels (health based cleanup levels). DRO was present in the surface soil at 4,060 mg/kg. DEC responded via letter, dated September 15, 2015; requested further delineation and remediation of soil above health based levels. Advised that contaminant concentrations may exceed RCRA levels. Joshua Barsis
5/20/2016 Update or Other Action Work plan request letter sent to Chalkyitsik Native Corp. Erin Gleason
5/9/2017 Update or Other Action Sent overdue work plan letter to Chalkyitsik Native Corp. They must contact ADEC by July 1 or ADEC will file and NEC. Erin Gleason
3/1/2019 Update or Other Action Received 2015 Bulk Fuel Assessment from Alaska Energy Authority Erin Gleason
2/2/2022 Update or Other Action Sent letter to Chalkyitsik Native Corporation to notify them of their overdue workplan and asked them to contact ADEC regarding recent work and near term intentions at the site. Naomi Mason
4/28/2023 Workplan Requested Request for site update/contact ADEC project manager letter sent on this date. Naomi Mason

Contaminant Information

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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