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Site Report: AKARNG Nunapitchuk FSA

Site Name: AKARNG Nunapitchuk FSA
Address: Unnamed Boardwalk, Nunapitchuk, AK 99641
File Number: 2436.38.001
Hazard ID: 1859
Status: Active
Staff: Jenny Gates, 9072628203 jenny.gates@alaska.gov
Latitude: 60.894515
Longitude: -162.459482
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

Several fuel spills have been reported for the Nunapitchuk FSRC. A 1992 compliance inspection conducted by AKARNG noted two fuel releases, although the quantity of fuel released and the extent of contamination was not known. In January 1993, approximately 200 to 300 gallons of heating oil was released from the piping of the 3,000-gallon, double-walled AST next to the Old FSRC. The spill was reportedly caused by a faulty fitting along the feed line between the AST and the building. AKARNG personnel constructed snow trenches and placed a boom along the spill boundary. Then a recovery effort was performed by filling drums with fuel-contaminated snow. Approximately 100 gallons of heating oil was recovered. In June 1997, a spill of 80 to 150 gallons of heating oil from the same AST was reported to have occurred during the winter of 1996/1997. An approximate area measuring 200 to 300 square feet was contaminated; however, the location and extent of the release are unknown. In July 2015, an RA was performed and a total of 23.92 tons of contaminated soil was removed from the Nunapitchuk FSRC site. Results for confirmation soil samples collected from the final limits of the excavations indicated that all soil with DRO, RRO, GRO benzene, toluene, 1-methylnaphthalene, 2-methylnaphthalene, and naphthalene concentrations greater than the ADEC-approved site-specific cleanup levels was removed from the Nunapitchuk FSRC. The site is currently in a groundwater and surface water long term monitoring program.

Action Information

Action Date Action Description DEC Staff
2/15/1996 Site Added to Database DRO. Bill Wright
2/22/1996 Site Ranked Using the AHRM Initial ranking. Bill Wright
9/9/1997 Site Ranked Using the AHRM Site reranked. Changed Air Exposure Index Value from 0.1 to 0.2; and SW Exposure Index Value to 1 from 0.4. Former Priority was Medium. Scott Pexton
9/17/1997 Update or Other Action Received Final Site Sampling Plan prepared by Hart Crowser, Inc. Scott Pexton
4/6/1998 Update or Other Action Received Draft Remedial Investigations report prepared by Hart Crowser, Inc. Scott Pexton
8/11/1998 Update or Other Action Letter sent with comments on draft report. Scott Pexton
10/28/1998 Update or Other Action Received Final Remedial Investigation report prepared by Hart Crowser, Inc. Scott Pexton
10/21/1999 Site Ranked Using the AHRM Site reranked based on information in the October 1998 Remedial Investigation Report. Scott Pexton
1/26/2000 Update or Other Action Received draft corrective action plan for restoration activities at Eek, Chefornak, Napaskiak, Nunapitchuk, Kipnuk, and Kwethluk. Scott Pexton
2/28/2000 Update or Other Action Received faxed copies of comments from AKARNG on draft corrective action plan. Scott Pexton
3/30/2000 Update or Other Action Received Corrective Action Plan for Nunapitchuk Federal Scout Armory, prepared by Clearwater Environmental, Inc. Scott Pexton
4/11/2000 Update or Other Action Sent letter to Norm Straub with comments on the interim removal actions proposed in the corrective action plan. Scott Pexton
4/13/2000 Interim Removal Action Approved Letter sent to Norm Straub approving the interim action to excavate up to 10 cubic yards of petroleum contaminated soil from known hotspots. Soil will be stored in 55 gallon drums for future transport to an offsite treatment facility. Scott Pexton
4/13/2000 Update or Other Action Received addendum to the corrective action plan, prepared by Clearwater Environmental, Inc. Scott Pexton
11/27/2000 Update or Other Action ADEC received Post Treatment Report for Nunapitchuk Additional Soil Remediation, prepared by BNC International, Inc. ADEC also received a Draft Interim Removal Action report, prepared by Clearwater Environmental, Inc. Scott Pexton
9/25/2001 Update or Other Action Received email with attachments with comments from the Alaska Army National Guard project manager to be addressed in the final interim removal action report. Scott Pexton
12/18/2001 Update or Other Action Received Final Interim Removal Action Report prepared by Clearwater Environmental, Inc. A total of ten cubic yards of DRO contaminated soil was removed from the site and placed in 55-gallon drums for transport to the BNCI thermal treatment facility in Bethel. Confirmation soil samples collected from the excavated area were reported with DRO concentrations ranging from 514 to 14, 200 mg/kg. Scott Pexton
8/6/2003 Update or Other Action ADEC sent letter to Norman Straub of Anchorage Army National Guard (AKARNG) with comments regarding Draft Alternative Cleanup Level Demonstration Project dated December, 2002. Beatrice Egbejimba
9/18/2003 Update or Other Action ADEC approval letter sent to Norm Straub (AKARNG). The final workplan for ACL demo project was received 9/3/03. Beatrice Egbejimba
4/7/2004 Update or Other Action File number assigned: 2436.38.001. Sarah Cunningham
12/19/2005 Update or Other Action A comment letter was drafted for the draft ACL Demonstration Report. The site is on a floating muskeg and because of that has surface water rather than groundwater that has been impacted by historic spills. Debra Caillouet
1/31/2008 Update or Other Action Staff reviewed the compliance cleanup site characterization report and sent comments to the AKARNG Debra Caillouet
4/2/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Debra Caillouet
4/25/2008 Update or Other Action The Alaska Department of Environmental Conservation (DEC) received the Alternative Cleanup Level Demonstration Project, Nunapitchuk Federal Scout Armory, December 2005 final report on April 14, 2008. The report does not address the comments provided by DEC in December 2005. The report does not accurately present the data obtained and does not meet the requirements of 18 AAC 75.335. Debra Caillouet
2/3/2010 Meeting or Teleconference Held Staff participated in the Installation Action Plan meeting. Debra Caillouet
11/30/2010 Document, Report, or Work plan 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
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
5/30/2012 Document, Report, or Work plan Review - other Comment sent on the Draft Data Gap Investigation Report Debra Caillouet
2/4/2013 Site Characterization Report Approved Nunapitchuk Federal Scout Readiness Center, Data Gap Investigation Report, January 2013 The investigation defined the areas of the site with soil contamination from diesel range organics (DRO) remaining. Groundwater and surface water has been impacted although not migrating off-site. The hydrocarbon risk calculator was used to calculate proposed alternative cleanup levels of 12,258 mg/kg DRO, 8393 mg/kg residual range organics, 0.723 mg/kg benzene and 7.9 mg/kg toluene. ADEC has no objection to the use of these soil cleanup levels. Groundwater and surface water monitoring is recommended in the report and ADEC concurs. Debra Caillouet
6/10/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72837 Spills/leaks. Debra Caillouet
9/30/2013 Cleanup Level(s) Approved Clean up levels approved in ROD Debra Caillouet
2/2/2015 Document, Report, or Work plan Review - other Comment sent on the draft remedial action plan Debra Caillouet
12/17/2015 Update or Other Action Staff changed to Danielle Duncan and hard file transferred to the Juneau office. Kristin Thompson
2/19/2016 Document, Report, or Work plan Review - other Rec'd draft Nunapitchuk remedial action report this date. Danielle Duncan
3/2/2016 Document, Report, or Work plan Review - other Reviewed and provided comments on the draft remedial action report. The report documents excavation of 27 cubic yards of contaminated soil previously identified as having petroleum concentrations greater than the approved cleanup levels. The report also documents completion of the first of five (5) years of long term groundwater and surface water monitoring. It was suggested in the report that silica gel cleanup be utilized for groundwater and surface water samples and the department concurs so long as the samples are also analyzed without the cleanup step. Depending on the results of the next rounds of groundwater and surface water sampling, an investigation into why the surface water is contaminated at SW2 may be useful keeping in mind that the suprapermafrost water is hydrologically connected to surface water. Danielle Duncan
5/3/2016 Site Characterization Report Approved Approved the final RAR this date. Groundwater and surface water monitoring (5 year) will continue. Danielle Duncan
1/31/2017 Update or Other Action Provided minor comments on the draft LTM report. Danielle Duncan
1/31/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72837 Spills/leaks. Danielle Duncan
12/4/2017 Document, Report, or Work plan Review - other Received the Final Nunapitchuk 2016 Long Term Monitoring Report that described the results of 4 groundwater monitoring well samples and 2 surface water samples. The results were below ADEC cleanup levels for DRO for all 4 wells. Two samples (MW1 and MW3) had RRO concentrations greater than cleanup levels: 2.2 and 1.2 mg/L. There were detections of ethylbenzene, xylenes, and toluene in the surface water samples that resulted in a TAH value of 0.02-0.10 mg/L which exceeds the cleanup level of 0.01 mg/L. Detections of PAHs resulted in exceedance of the TAqH cleanup level of 0.015 mg/L. The surface water TAH and TAqH are decreasing a bit but remain fairly stable at 0.07 mg/L. Danielle Duncan
5/3/2018 Site Characterization Report Approved Reviewed the 2017 long-term monitoring report this date. The groundwater analytical results for DRO were below the cleanup levels at concentrations up to 1.1 mg/L. The RRO results for groundwater were above the cleanup level for 2 wells at concentrations up to 1.6 mg/L. Surface water sample (SW2) failed both TAH and TAqH surface water quality standards at 8 times the limit for TAH. These results suggest a significant source of petroleum contamination. Additionally, a petroleum sheen was observed at the base of the main entrance ramp. Danielle Duncan
8/30/2018 Update or Other Action The consultant indicated the wells were only installed about 3 ft before they hit permafrost and wasn’t sure permanent wells would be a good idea due to the frost jacking. She said next year they could try stainless steel points (also temporary) instead of the prepack wells they are using now. The AKARNG applied for funding for wells also for Federal FY19. Danielle Duncan
2/11/2019 Document, Report, or Work plan Review - other Provided comments on the 2018 LTM report this date. Danielle Duncan
3/15/2019 Site Characterization Report Approved Approved the Final Nunapitchuk 2018 Long Term Monitoring Report this date. Four temporary groundwater monitoring wells were installed and sampled 24 hours later. Monitoring wells (MW) 2 and 3 met the cleanup levels, but 1 and 4 did not meet the cleanup level for RRO. MW1 had a RRO concentration of 2.1 mg/L and MW4 had a concentration of 1.2 mg/L. MW1 has had RRO concentrations above the cleanup level for the past three sampling events and is not decreasing, however, may be stable. MW4 has met the cleanup levels historically, but not for this sampling event. The surface water data met the cleanup levels. Danielle Duncan
4/17/2020 Meeting or Teleconference Held On April 17, 2020 new ADEC PM and AKARNG PM held a meeting to discuss site status and plans for field season 2020 and future work. Rachael Petraeus
5/11/2020 Site Characterization Report Approved On May 11, 2020 ADEC received and reviewed “Final Nunapitchuk 2019 Long Term Monitoring Report Federal Scout Readiness Center Alaska Army National Guard FY 14 Defense Environmental Restoration Program (DERP)” dated May 2020. The 2019 sampling event described in this report was completed on 29 August 2019, and was the fifth LTM event of the 5-year monitoring program. Groundwater samples were collected from four temporary monitoring wells and were analyzed for DRO and RRO. Results from three of the four wells exhibited concentrations of RRO that exceeded the cleanup level. All of the DRO results and the RRO result from the remaining well were less than their respective cleanup levels. Results from both surface water sample locations exceeded cleanup levels for both TAH and TAqH. Rachael Petraeus
9/15/2020 Document, Report, or Work plan Review - other On September 15, 2020 ADEC received "Draft Nunapitchuk 2020 Long Term Monitoring Work Plan Addendum Federal Scout Readiness Center Alaska Army National Guard" dated September 2020. The work plan describes planned long term monitoring activities for groundwater and surface water sampling. Rachael Petraeus
12/11/2020 Site Characterization Workplan Approved On December 11, 2020 ADEC approved the “Amended FINAL Nunapitchuk 2021 Long-Term Monitoring Work Plan Addendum Federal Scout Readiness Center Alaska Army National Guard” dated December 2020. The work plan includes additional sampling during the spring of 2021. Rachael Petraeus
11/22/2022 Update or Other Action ADEC received the "Draft Nunapitchuk 2021 & 2022 LTM Report", dated November 2022. Flannery Ballard
2/7/2023 Document, Report, or Work plan Review - other The DEC is providing comments in response to the DRAFT 2021 and 2022 Nunapitchuk Long Term Monitoring Report. The report should be updated and re-submitted to the DEC for approval. Flannery Ballard
5/22/2023 Long Term Monitoring Workplan or Report Review The DEC approved the 2022 Fall LTM report that documented groundwater and surface water monitoring at the site. Analytical results demonstrated DRO is below CULs in all monitoring wells. RRO exceeded the CUL in 3 of the four monitoring wells. Surface water exceeded for TAH and TAqH in both surface water samples. Flannery Ballard
6/4/2024 Long Term Monitoring Workplan or Report Review Draft Nunapitchuk Fall 2023 Long-term Monitoring Report received on 06.04.2024. ADEC comments sent on 07.10.2024; AKARNG RTCs received 12.16.2024. Jenny Gates
9/16/2024 Long Term Monitoring Workplan or Report Review Draft Nunapitchuk 2024 Long-Term Monitoring Work Plan Addendum received on 08.23.2024. ADEC comments sent on 09.11.2024; AKARNG RTCs received on 09.18.2024; ADEC RTCs and approval letter sent on 09.19.2024. Jenny Gates
9/26/2024 Offsite Soil or Groundwater Disposal Approved ADEC Contaminated Media Transport and Treatment or Disposal Approval Form received and approved on 09.26.2024. Jenny Gates

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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
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