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Site Report: AKARNG Tununak FSA


Site Name: AKARNG Tununak FSA
Address: Unnamed Road, Tununak, AK 99681
File Number: 2453.38.001
Hazard ID: 3201
Status: Active
Staff: Danielle Duncan, 9074655207 danielle.duncan@alaska.gov
Latitude: 60.585604
Longitude: -165.255819
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

Petroleum product from a heating oil system. Maintenance records for the Old FSRC noted an oil stain inside the Old FSRC in 1965 and a leaking fuel line in 1968. Small stains were noted on the outside of the building on the southeast and southwest sides of the Old FSRC in photographs taken in 1984. In March 1995, approximately 150 gallons of heating oil was released inside the Old FSRC and approximately 20 gallons dripped through the floor to the ground beneath the building. Oil-absorbent booms and pads were placed around and on the soil and disposed of after the leak had been stopped. AKARNG records indicate that the release most likely occurred from the day tank in the Old FSRC. A Record of Decision (ROD) for the Tununak FSRC was approved by ADEC in 2013. The ROD established site-specific cleanup levels for contaminants of concern that indicated unacceptable risk to human health based on Hydrocarbon Risk Calculator calculations or that exceeded groundwater ingestion criteria. The ADEC-approved site-specific cleanup level for soil listed in the ROD was 11,626 mg/kg for total (diesel range organics) DRO. All historic soil sample results indicated that DRO concentrations in soil are less than the ADEC-approved site-specific soil cleanup levels. The cleanup level for groundwater is 1.5 milligrams per liter (mg/L) for DRO. The site is currently undergoing long term groundwater monitoring.

Action Information

Action Date Action Description DEC Staff
7/27/1998 Update or Other Action Received Preliminary Assessment Records Review report and Draft Site Sampling Plan, both prepared by Hart Crowser, Inc. Scott Pexton
8/12/1998 Site Characterization Workplan Approved Letter sent with approval of draft sampling plan. Scott Pexton
9/14/1998 Update or Other Action Received Final Site Sampling Plan for Site Investigation, prepared by Hart Crowser, Inc. Scott Pexton
1/25/1999 Update or Other Action Received Draft Site Investigation report, prepared by Hart Crowser, Inc. Scott Pexton
8/20/1999 Update or Other Action Received Final Site Investigation report, prepared by Hart Crowser, Inc. Scott Pexton
11/12/1999 Site Added to Database Petroleum product from a heating oil system. Scott Pexton
11/18/1999 Site Ranked Using the AHRM Site ranked based on information in August 1999 Final Site Investigation report, prepared by Hart Crowser, Inc. Scott Pexton
1/22/2004 Update or Other Action ADEC received draft Alternate Cleanup Level Demonstration Project workplan. Beatrice Egbejimba
4/12/2004 Update or Other Action File number assigned: 2453.38.001. Sarah Cunningham
1/6/2006 Update or Other Action Staff reviewed and prepared comments on an Alternative Cleanup Level Demonstration report. Debra Caillouet
4/9/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Debra Caillouet
4/15/2008 Site Characterization Report Approved Staff accepted the final Alternative Cleanup Level Demonstration report. Debra Caillouet
12/3/2008 Report or Workplan Review - Other Staff sent comment to the Guard on the draft Secondary Site Characterization Report. Debra Caillouet
2/18/2009 Report or Workplan Review - Other Final Secondary Site Characterization, Federal Scout Armory, Tununak. The report provides additional characterization of the contamination remaining at the Armory, but it does not define the extent. When planning for a final remedial action at the Tununak FSA the lack of complete characterization of the nature and extent of the contamination must be addressed. Debra Caillouet
2/3/2010 Meeting or Teleconference Held Staff participated in the Installation Action Plan meeting. Debra Caillouet
11/30/2010 Report or Workplan Review - Other Staff reviewed and sent comment to the Alaska Army National Guard on the Draft Work Plan for Site Characterization at 21 Alaska Federal Scout Readiness Centers, November 2010, including the Site Specific Plans for Akiak, St. Mary’s and Tuntutuliak. Debra Caillouet
2/25/2011 Report or Workplan Review - Other Comment was sent on the Field Sampling Plans for Napakiak, Tununak, Mountain Village and Kipnuk, February 2011 Debra Caillouet
5/23/2011 Site Characterization Workplan Approved Final Work Plan for Site Characterization at 21 Alaska Federal Scout Readiness Centers, April 2011 approved. Debra Caillouet
6/14/2013 Report or Workplan Review - Other Tununak Federal Scout Readiness Center Data Gap Investigation Report, Draft March 2013 In general the report provides additional characterization for the site. Please review and revise Sections 5.2 and 5.3, the work plan called for the use of an excavator to collect a deep soil sample and this was based upon the fact that no samples deeper than 3 feet had been obtained due to the nature of the soil during previous investigations. Delineation of the vertical extent is a requirement for site characterization and was identified as a data gap. Debra Caillouet
7/16/2013 Site Characterization Report Approved Tununak Federal Scout Readiness Center Data Gap Investigation Report, Final June 2013 The report recommends no soil cleanup and long-term monitoring of the groundwater. Institutional Controls will need to be placed on the property to prevent use of the groundwater until it meets the cleanup standards. It is not clear in the report who owns the land. If this land is withdrawn for use by the Alaska Army National Guard a survey will need to be completed and filed at the Recorders Office noting the restrictions on groundwater use. If this property is owned by another entity, they will need to concur with the implementation of the IC’s. Please review the Guidance on Using Institutional Controls in Oil and Other Hazardous Substance Cleanups, February 2011 for further information before preparing a Record of Decision. Debra Caillouet
9/30/2013 Cleanup Level(s) Approved ROD Debra Caillouet
2/2/2015 Report or Workplan Review - Other Comment sent on the draft remedial action plan Debra Caillouet
12/16/2015 Report or Workplan Review - Other Rec'd 2 docs: Final long term monitoring (LTM) plan and LTM reports this date. Danielle Duncan
12/17/2015 Update or Other Action Staff changed to Danielle Duncan and hard file transferred to the Juneau office. Kristin Brown
12/30/2015 Update or Other Action Read and provided minor comments on the Draft Tununak 2015 Long Term Monitoring Report this date. The site-specific cleanup levels for the site are 11,626 mg/kg DRO and 1.5 mg/L DRO. Historic soil sampling indicated that the soil on site already met the cleanup levels so no additional excavation was required. The current draft report documents the installation of three groundwater monitoring wells. One in the vicinity of the old aboveground storage tanks and two downgradient from them. These wells were sampled the first time as part of a five year groundwater monitoring plan to facilitate a cleanup complete without institutional controls determination. Monitoring wells 2 and 3 had DRO concentrations below the cleanup level and monitoring well 1 had DRO concentrations of 3.71 and 5.82 mg/L; one value is a duplicate. Danielle Duncan
2/19/2016 Report or Workplan Review - Other Rec'd Final Tununak 2015 Long-Term Monitoring Report this date. Danielle Duncan
12/29/2016 Site Characterization Report Approved Approved the Draft Tununak 2016 Long Term Monitoring Report this date. The report documents the 2016 sampling of the three permanent monitoring wells (MW1, MW2, and MW3). MW1 had a DRO concentration of 4.63 mg/L and 4.69 mg/L (duplicate). The results for MW1 and MW2 were 0.416 and 0.269 mg/L respectively. These results are similar to the results for 2015 and indicate that MW1 still has DRO concentrations greater than the ADEC 18 AAC 75.345 Table C cleanup level of 1.5 mg/L. Danielle Duncan

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details
ROD

Missing Location Data

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