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Site Report: FAA Lake Minchumina Landspread

Site Name: FAA Lake Minchumina Landspread
Address: Lake Minchumina, Lake Minchumina, AK 99757
File Number: 225.38.001
Hazard ID: 2910
Status: Active
Staff: Tim Sharp, 9074512131 tim.sharp@alaska.gov
Latitude: 63.885454
Longitude: -152.304173
Horizontal Datum:NAD83

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

Approximately 2200 cubic yards of gasoline- and diesel-contaminated soils excavated from FAA Minchumina sites were placed in lined off-site biocells for treatment. Soils averaged three feet deep in cells while the liner was present. In July 1996, cells were sampled and prematurely decommissioned without waiting for confirmation sampling results by ripping up bottom liner. Department staff converted cell treatment system to landspreading without a liner and allowed further spreading to a depth of approximately one foot thickness. FAA's contractor erroneously spread some of the soils over the tank farm area which had been excavated and backfilled with clean fill. Summer 1998 sample results indicate diesel range organic levels as high as 7,200 mg/kg are still present in the soils. Combination LUST and CS Site.

Action Information

Action Date Action Description DEC Staff
12/27/1999 Site Added to Database Diesel and gasoline. Eileen Olson
1/24/2000 Site Ranked Using the AHRM Initial ranking. Eileen Olson
1/14/2002 Update or Other Action See FAA Lake Minchumina for updated database information. Elizabeth Stergiou
9/18/2002 Update or Other Action Sent letter requesting groundwater monitoring for all existing wells on site, with a schedule of monitoring to be submitted by March 31, 2003 and the monitoring to be complete by June 30, 2003. Also requested the long term contaminated soil stockpile constructed during field season 2001 should be cleaned up by the end of field season 2003. Elizabeth Stergiou
9/19/2002 Update or Other Action Sent general letter requesting the following documents be submitted by 10/1/02: the final corrective action report for work completed in 2001 and the final release investigation report for the 2000 release investigation. Elizabeth Stergiou
9/4/2003 Update or Other Action ADEC approved the workplan for the Fall 2003 Sampling and Analysis Plan for various sites. Deborah Williams
11/17/2011 Update or Other Action File review ordered at request of Dept of Natural Resources. Fred Vreeman
11/29/2011 Meeting or Teleconference Held Report to DNR with site summary and recommendation to proceed with selection. Fred Vreeman
3/27/2012 Meeting or Teleconference Held Meeting with FAA to discuss and approve future plans for Minchumina property. The FAA plans to continue to own 10 of our 750 acres, and transfer the other 740. ADOTPF wants some and FAA is not sure who selected the rest. The 10 acres include the landfarm. stockpiles, former building locations etc, basically the main area the FAA occupied at Minchumina. Work at site will continue. Schedule will be submitted annually. Fred Vreeman
9/15/2014 Update or Other Action Verified site is on list for work in FY16. Fred Vreeman
8/7/2015 Update or Other Action Funding in FY15 was used for high priority remediation projects. Request sent this day to FAA asking for status update on Minchumina. Fred Vreeman
4/26/2016 Update or Other Action Site reassigned for follow up by project manager Fred Vreeman
8/21/2017 Site Characterization Workplan Approved Final Work Plan for Lake Minchumina FAA Station Release Investigation was approved. This project includes sampling of the three existing monitoring wells, installation and sampling of up to two additional monitoring wells, Multi Increment (MI) sampling of the landspread and two stockpiles, and Ultra-Violet Optical Screening Tool (UVOST) probing to delineate petroleum contaminated soil (PCS) at eight Areas of Concern (AOCs). The landspread will be sampled in two Decision Units (DUs). Each landspread decision unit will be a vertically measured layer to be sampled at pre-determined depths. The two adjacent soil stockpiles will be MI–sampled as single, individual DU, one per stockpile, with well-defined sample depth intervals for each grid cell. John O'Brien
2/20/2020 Update or Other Action DEC commented on 2019 Draft Report for Lake Minchumina FAA Station Demolition and Remedial Action. The report detailed demolition of four buildings with lead based paint, ACM, and PCBs. Contaminated soil was added to soil stockpiles. The landfarm was tilled weekly during the field season. Tim Sharp
4/2/2020 Update or Other Action DEC Approved 2019 Final Demolition and Remediation report. Four buildings were demo'd and weekly tilling efforts were detailed to remediate POL contaminated soils. All waste streams were accounted for and transport forms were included. Tim Sharp
6/7/2021 Site Visit DEC visited the site and observed the stockpiles being consolidated into the landfarm area, the remediated soil backfill material stockpile, and all other AOCs at the site. Building 300/600 contamination was summarized and will be added as a new source area. The Former Drum Storage Area was examined and no drums or contaminated soil was apparent, and will be assessed for closure determination. Other previously closed sites were observed, and photos were taken and uploaded to the site file. Tim Sharp
9/17/2021 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 73886 name: auto-generated pm edit FAA Lake Minchumina Landspread Tim Sharp
4/25/2022 Document, Report, or Work plan Review - other DEC reviewed and submitted comments on the Draft 2022 Work Plan for Minchumina Soil Removal and Treatment. The work plan proposes excavating approximately 1300 cubic yards of petroleum contaminated soil to be landfarmed on site. The existing landfarm will have clean soil removed and added to a stockpile. DEC requested clarification on excavation extents and depths. Tim Sharp
5/6/2022 Document, Report, or Work plan Review - other DEC Approved the Final 2022 Soil Removal and Treatment Work Plan. Excavations will reach to 15 feet deep. Tim Sharp
5/16/2022 Offsite Soil or Groundwater Disposal Approved DEC approved the Contaminated Media Transport and Treatment or Disposal Approval form for 833 CYs of landfarmed soil to be used as backfill for various 2022 excavation sites. The soils have remediated to below cleanup levels. Tim Sharp
8/18/2022 Site Characterization Workplan Approved DEC approved the Work Plan Addendum/Scope of Work Revision for Dioxin Sampling. Soils will be sampled from the landfarm, stockpiles, and previous backfill locations for dioxins of all congeners and compared to TEQs to determined if dioxins have been rereleased at the site. Tim Sharp
9/30/2022 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 73886 auto-generated pm edit FAA Lake Minchumina Landspread. Tim Sharp
1/5/2023 Document, Report, or Work plan Review - other DEC received and reviewed the Draft 2022 Report for FAA Minchumina Soil Removal and Treatment. The report details excavation of petroleum-contaminated soil, landfarming operation and maintenance activities, and sampling of previously remediated soils for dioxins. The top foot of the landfarm was remediated in 2022 and is below applicable cleanup levels. Dioxins were detected in all samples collected but were all below cleanup levels. There is extensive petroleum contamination remaining in soils at several areas of concern, including the Former Building 600, “Hot Spots” 1-5, and at the petroleum, oils, and lubricants (POL) 1,2,4 excavation limits. Tim Sharp
1/24/2023 Document, Report, or Work plan Review - other DEC approved the Final Lake Minchumina 2022 Soil Removal and Treatment Report. Tim Sharp
2/23/2024 Document, Report, or Work plan Review - other DEC provided comments for the FAA Lake Minchumina Draft 2024 Site Investigation/Remedial Investigation/Landfarm Operations Work Plan. The work plan involves addressing nine areas of concern at the site, including by landfarming treated soil, investigating lead and polychlorinated biphenyl (PCB) paint impacts, investigating several areas of petroleum, oils, and lubricants (POL) impacts, and installing and sampling groundwater wells, among other activities. Tim Sharp

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