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Site Report: AKARNG Kipnuk FSA

Site Name: AKARNG Kipnuk FSA
Address: Lot 2, USS 4236, Kipnuk, AK 99614
File Number: 2421.38.001
Hazard ID: 1557
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 59.934101
Longitude: -164.038311
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 contamination at site.

Action Information

Action Date Action Description DEC Staff
2/15/1996 Site Added to Database Site added to database. Bill Wright
2/22/1996 Site Ranked Using the AHRM Site ranked. Bill Wright
4/1/1996 Preliminary Assessment Approved (Old R:Base Action Code = SA1A - Phase I Site Assessment Approval). Reviewed and approved a phase 1 site assessment. Bill Wright
4/1/1996 Update or Other Action Letter sent with approval of report. Bill Wright
9/9/1997 Site Ranked Using the AHRM Site reranked. Changed Site Access Value from 1 to 2; Population Density Value from 3 to 5; and SW Environments from 3 to 2. Scott Pexton
4/6/1998 Update or Other Action Received Draft Remedial Investigation Report, prepared by Hart Crowser, Inc. Scott Pexton
8/11/1998 Update or Other Action Letter sent with comments on draft remedial investigation report. Scott Pexton
11/4/1998 Update or Other Action Received Final Remedial Investigations report, prepared by Hart Crowser, Inc. Scott Pexton
10/15/1999 Site Ranked Using the AHRM Site reranked based on 9/9/98 letter from William Vagt and information in October 1998 Final Remedial Investigations report. Scott Pexton
1/26/2000 Update or Other Action Received draft Corrective Action Plan for six Army National Guard facilities including Kipnuk. Scott Pexton
2/28/2000 Update or Other Action Received a faxed copy of comments from the Army National Guard project manager, Norm Straub. Scott Pexton
4/18/2000 Update or Other Action Received a revised Corrective Action Plan, prepared by Clearwater Environmental for the Alaska Army National Guard. Scott Pexton
4/24/2000 Cleanup Level(s) Approved Method one Category D, Table A1 for petroleum approved with approval of interim removal action. Cleanup level is 1,000 mg/kg for GRO and 2,000 mg/kg for DRO, and RRO; benzene cleanup level is 0.02 mg/kg. Final cleanup levels may be proposed in the report submitted after the interim removal action is completed. Scott Pexton
4/24/2000 Interim Removal Action Approved Letter sent to Norm Straub of the Alaska Army National Guard with approval of the interim action to remove up to 10 cubic yards of petroleum contamianted soil. Scott Pexton
11/27/2000 Update or Other Action Received Post Treatment Report fot thermally treated soils processed by ChemTrack and BNC International Inc. at a treatment facility in Bethel. Scott Pexton
12/6/2000 Update or Other Action Received a draft Interim Removal Action Report prepared by Clearwater Environmental. 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. for the Alaska Army National Guard. A total of eightr cubic yards of DRO contaminated soil was removed from the site and placed in thirty-two 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 811 to 17, 700 mg/kg. Benzene was reported in one soil confirmation sample at a concentration of 0.171 mg/kg. Scott Pexton
8/5/2003 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
8/20/2003 Update or Other Action ADEC sent letter to Norman Straub of Anchorage Army National Guard (AKARNG) with approval of Alternative Cleanup Level Demonstration Project workplan dated August, 2003. Beatrice Egbejimba
3/19/2004 Update or Other Action File number assigned: 2421.38.001. Sarah Cunningham
5/9/2005 Update or Other Action Staff reviewed the Installation Action Plan and sent a comment letter to the AKARNG. The plan contains a summary of the site characterization and the removal of eight cubic yards of impacted soil in 2000. The results of the confirmation testing of the walls of the excavation indicate that DRO contamination did remain in place after the excavation. The level remaining was up to 17,000 mg/kg DRO but the results were rejected due to moisture content up to 90%. The excavation and sampling occurred when soils were frozen. No GRO or BTEX were detected in the samples. Currently the results of an Alternative Cleanup Level (Method III) evaluation are pending. The results of this will determine the future action at the site. Assuming that the results will not show any significant change in the level of contaminant remaining at the site, DEC concurs that the plan for a NFRAP or long term monitoring with five year reviews should address the concerns at the site. Debra Caillouet
10/11/2005 Update or Other Action Comments were drafted for the ACL demonstration report. There were significant issues with sample collection. Debra Caillouet
3/18/2008 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, Kipnuk Federal Scout Armory, November 2005 final report on April 14, 2008. The report does not address the comments provided by DEC in October 2005. The report does not accurately present the data obtained and does not meet the requirements of 18 AAC 75.335. Debra Caillouet
1/29/2009 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 72535 name: Spills/Leaks Debra Caillouet
12/21/2009 Update or Other Action Comment was sent to the AKARNG on a draft ROD 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
2/25/2011 Document, Report, or Work plan 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
1/22/2013 Site Characterization Report Approved Kipnuk Federal Readiness Center, Data Gap Investigation Report, Final January 2013 The investigation defined the areas of the site with contamination from diesel range organics and benzene remaining. Groundwater and surface water do not appear to be impacted. The hydrocarbon risk calculator was used to calculate proposed alternative cleanup levels based on the mass fraction of aliphatic and aromatic hydrocarbons in the diesel range. This resulted in proposed cleanup levels of 1500 mg/kg DRO and 0.05 mg/kg benzene based on the migration to groundwater pathway. ADEC has no objection to the use of these cleanup levels. Debra Caillouet
6/10/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72535 Spills/Leaks. Debra Caillouet
6/27/2013 Cleanup Level(s) Approved Record of Decision signed for 12,500 mg/kg DRO Debra Caillouet
2/6/2015 Document, Report, or Work plan Review - other Draft Kipnuk Remedial Action Plan, Federal Scout Readiness Center, Kipnuk, Alaska February 2, 2015 Debra Caillouet
4/20/2015 Cleanup Plan Approved Remedial action to remove and ship off-site remaining contaminated soil. Debra Caillouet
11/10/2015 Document, Report, or Work plan Review - other Rec'd (Anchorage) Draft Remedial Action Report, Kipnuk this date. File has been transferred to Juneau. Danielle Duncan
12/1/2015 Document, Report, or Work plan Review - other Reviewed and provided comments on the comment responses: Draft Remedial Action Report, Kipnuk this date. No major issues with the comment responses. Danielle Duncan
12/29/2015 Document, Report, or Work plan Review - other Rec'd final remedial action report this date. Danielle Duncan
1/27/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72535 Spills/Leaks. Danielle Duncan
1/29/2016 Cleanup Complete Determination Issued The Final Remedial Action Report Federal Scout Readiness Center Kipnuk, Alaska, prepared by Ahtna Environmental Inc. (Ahtna), and dated December 2015, documents the final cleanup activities at the site. Ahtna excavated contaminated soil at the site in four (4) different areas previously identified during prior investigations. These areas were all near the former 3,000 gallon AST and west of the footprint where historical investigations indicated contamination greater than the cleanup level. All of the excavations were backfilled with clean material and the area was seeded with native grasses to prevent erosion. A total of 5.47 tons of petroleum contaminated soil was transported to the Columbia Ridge landfill in Arlington, Oregon landfill for disposal. Confirmation samples taken throughout the site indicate that all of the soil exceeding the cleanup level of 12,500 mg/kg DRO has been removed. Danielle Duncan
3/17/2020 Site Reopened Site is being re-opened due to a new spill. Kara Kusche
3/18/2020 Cleanup Complete Determination Issued On September 5, 2018, the fuel line that connected a day tank to the annex building was discovered to be sheared off and an estimated volume of five to eight gallons of heating oil was leaked. Analytical results indicated the highest concentration for diesel rang organics was 4,100 mg/kg. The previous contamination is associated with two releases of heating oil from a tank not associated with this release investigation. A site-specific cleanup level of 12,500 milligrams per kilogram (mg/kg) for diesel range organics (DRO) was approved by ADEC in Record of Decision (ROD) signed on June 27, 2013. In 2016 the site was given a cleanup complete status. At this time, the remaining contamination from the September 05, 2018 spill are below the alternative cleanup levels and no new exposure pathways exist. At this time ADEC will not move for further action. The site will remain closed. Rachael Petraeus

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil DRO contamination in surface soil (0 to 2 feet below ground surface) is at its greatest (4,100 mg/kg) which is well below the ingestion (10,250 mg/kg) and inhalation (12,500 ,g/kg) cleanup levels.

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)

No associated sites were found.

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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