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Site Report: AKARNG Fort Yukon FSA


Site Name: AKARNG Fort Yukon FSA
Address: 3rd Avenue & Hill Street, Fort Yukon, AK 99740
File Number: 740.38.012
Hazard ID: 3072
Status: Cleanup Complete
Staff: ,
Latitude: 66.565056
Longitude: -145.254430
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

Characterization and cleanup activities conducted under the regulatory authority of the ADEC began in 1998 following a site investigation conducted the same year by Ogden Environmental and Energy Services Co., Inc. (Ogden) under contract for the AKARNG and is documented in the Preliminary Assessment/Site Investigation dated January 1998. Ogden collected ten field screening soil samples and five (5) analytical soil samples from the FSA in August of 1996. These samples were collected from three (3) areas of concern: the AST, the drum storage area, and the culvert. Soil was field screened using a field-portable infrared spectrophotometer and analytical samples were analyzed for DRO and TPH. Select samples were additionally analyzed for GRO and BTEX. The results of the investigation found that there was petroleum contamination at all 3 areas investigated. Contamination at the AST was found at up to 19,000 mg/kg DRO and 16,000 mg/kg TPH. Lower concentrations (up to 1,000 mg/kg TPH and 370 TPH) were found near the culvert and drum storage area. None of the GRO and BTEX components were detected. A remedial action was performed by Brice Environmental on behalf of the AKARNG in September 2016. This action is documented in the report Remedial Action Report Fort Yukon Federal Scout Readiness Center (FSRC), dated November 2016. According to the report, there were two (2) locations requiring excavation due to DRO and methylnaphthalenes concentrations exceeding the cleanup level established in the ROD. Excavation 1 was located adjacent to the FSRC building near the former location of the AST and Excavation 2 was southeast of the FSRC building near a culvert. Excavation of contaminated soil at both location was guided by a photoionization detector (PID). Post-excavation confirmation samples were collected from field screening samples having the highest PID readings. At Excavation 1, approximately 14 cy of contaminated soil was removed to a maximum depth of about 5.2 feet below ground surface. A total of 37 PID samples were collected and seven (7) confirmation samples and a duplicate were collected and analyzed for DRO, 1-methylnaphthalene, and 2-methylnapthalene. Final DRO concentrations in Excavation 1 ranged from non-detect to 6,000 mg/kg. The remaining concentration of 1-methylnaphthalene ranged from non-detect to 3.8 mg/kg and from non-detect to 2.7 mg/kg for 2-methylnaphthalene. Excavation 2 was located near a culvert and 32 PID samples were collected during the excavation of approximately two (2) cy of contaminated soil. The excavation was at a maximum depth of about five (5) feet below ground surface. Final confirmation samples from the excavation had DRO concentrations ranging from 1,600-6,600 mg/kg, 1-methylnaphthalene was not detected, and 2-methylnaphthalene was 0.024-0.071 mg/kg. The clean overburden (10 cy) from the excavations was also field analyzed (15 PID readings) and two (2) samples were submitted for DRO and PAH analyses. The resulting DRO concentrations (790-6,300 mg/kg) were below cleanup levels as were the concentrations of 1 and 2-methylnaphthalenes (0.04-2.6 mg/kg). This clean overburden was used for backfill. Approximately 19 cy of contaminated soil was transported to Organic Incineration Technology Inc. (OIT) in North Pole for treatment. Certificates of thermal treatment for this soil were received by ADEC on September 7, 2017. After this remedial action, as demonstrated by the confirmation samples, the remaining soils on site meet the cleanup levels established in the ROD.

Action Information

Action Date Action Description DEC Staff
1/30/1998 Preliminary Assessment Approved (Old R:Base Action Code = SA1A - Phase I Site Assessment Approval). Received Final Report Preliminary Assessment/Site Investigation prepared by Ogden Environmental and Energy Services Co., Inc. Scott Pexton
6/17/1998 Site Added to Database DRO. Scott Pexton
6/17/1998 Site Ranked Using the AHRM Initial ranking. Scott Pexton
10/11/2000 Update or Other Action Letter sent to Norman Straub suggesting the ADEC Voluntary Cleanup Program as a cost-effective cleanup approach for this site. Scott Pexton
3/16/2004 Update or Other Action File number assigned: 740.38.012. Sarah Cunningham
5/17/2005 Update or Other Action Staff reviewed the IAP and sent the following letter: The armory has been inactive since 1993. The IAP fairly summarizes the results of a Site Investigation in 1996, which indicates diesel range organics in soil up to 19,000 mg/kg in a 500 square foot area near the 1,500 gallon aboveground heating oil tank. No other investigation or removal has occurred. The cleanup strategy recommended includes additional site characterization to determine the extent of the soil contamination and speculates that removal of the building and ancillary tank may be necessary to access the contamination. The Alaska Department of Environmental Conservation (DEC) agrees that additional site characterization is needed. Once the site is fully characterized DEC will work with you to determine the most appropriate cleanup goals. Debra Caillouet
6/23/2006 Update or Other Action Staff reviewed the Tageted Brownfields Assessment Report for Ft Yukon. DRO was detected at the armory at 3200 & 23000 mg/kg, GRO was detected at 510 mg/kg in areas near the AST. Debra Caillouet
3/17/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Debra Caillouet
8/20/2008 Update or Other Action staff sent comments on the draft work plan for site characterization to the AKARNG 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
4/19/2011 Report or Workplan Review - Other Draft Site Specific Work Plans, Fort Yukon, Kwethluk, Nightmute, Savoonga, and Toksook Bay, Federal Scout Armories, March 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
3/20/2012 Report or Workplan Review - Other Comment sent on the draft data gap investigation report. Debra Caillouet
4/16/2013 Site Characterization Report Approved Fort Yukon Federal Scout Readiness Center, Data Gap Investigation Report, March 2013 Debra Caillouet
6/10/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74047 Spills/Leaks. Debra Caillouet
8/27/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74047 Spills/Leaks. Debra Caillouet
9/19/2013 Cleanup Level(s) Approved ROD signed Debra Caillouet
12/17/2015 Update or Other Action Staff changed to Danielle Duncan and hard file transferred to the Juneau office. Kristin Brown
12/23/2015 Update or Other Action The site is being remediated this summer - work plan is coming. Danielle Duncan
3/3/2016 Report or Workplan Review - Other Rec'd draft Remedial Action Plan this date. Danielle Duncan
3/25/2016 Report or Workplan Review - Other Reviewed the draft remedial action plan and provided comments. Specifically, "Sample 11FTYSB005 within the drainage ditch also requires excavation (concentration = 21,000 mg/kg DRO at 2-3 ft. below ground surface) – add it to the work plan." I also instructed that the new final March 2016 ADEC Field Sampling Guidance be used. Danielle Duncan
4/4/2016 Update or Other Action Rec'd comment responses back from the RP and accepted. Danielle Duncan
8/22/2016 Update or Other Action Work on site will start in September. Danielle Duncan
1/3/2017 Final Cleanup Report Reviewed Reviewed the draft remedial action report and had no comments - accepted. 16 cubic yards of petroleum contaminated soil was excavated from the site and sent to OIT for treatment. All of the soil on site meets the cleanup levels established in the Record of Decision. Danielle Duncan
3/30/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74047 Spills/Leaks. Danielle Duncan
9/7/2017 Final Cleanup Report Reviewed Rec'd and reviewed the final report. Danielle Duncan
9/12/2017 Cleanup Complete Determination Issued All soil on site meets the site-specific cleanup levels and supra-permafrost groundwater on site is not considered a current nor reasonably potential future drinking water source as defined by 18 AAC 75.350 and, therefore, is not subject to cleanup levels established under 18 AAC 75.345(b)(1). Danielle Duncan

Contaminant Information

Name Level Description Media Comments
1-Methylnaphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
2-Methylnaphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

Missing Location Data

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