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Site Report: FAA Skwentna Station - SBRA

Site Name: FAA Skwentna Station - SBRA
Address: Near Skwentna, Skwentna, AK 99667
File Number: 2254.38.001
Hazard ID: 1504
Status: Active
Staff: Michael Hooper, 9074515174 michael.hooper@alaska.gov
Latitude: 61.977835
Longitude: -151.244972
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

The Simultaneous Broadcast Range with Adcock Antenna (SBRA) Range Building was located northwest of the Skwentna Airport Runway. The facility was built on top of a gravel pad at the end of the access road and consisted of a 15-by 20-foot wood frame building containing a concrete generator mount and five towers. A 500-gallon diesel AST was formerly located at the east end of the building. All infrastructure at the site has been removed. DRO and PAH contamination was detected in soil and groundwater samples at the site at concentrations above the ADEC cleanup levels.

Action Information

Action Date Action Description DEC Staff
8/11/1993 Site Added to Database GRO and DRO contamination. Former Staff
10/20/1993 Site Ranked Using the AHRM Initial ranking. Former Staff
5/15/2000 Update or Other Action Changed site name from Skwenta to FAA Skwentna. File review needed as ranking does not appear to be accurate. Eileen Olson
11/7/2000 Site Ranked Using the AHRM Changed Population Proximity Value from 0.5 to 1.0, Groundwater Usage Value from 0.8 to 1.0, lowered Air Exposure Index Value from 0.2 to 0.1. Bruce Wanstall
1/14/2002 Update or Other Action Corrected database status from inactive to active. Elizabeth Stergiou
7/22/2004 Meeting or Teleconference Held Meeting held with FAA to discuss 2004 work scheduled for Skwentna. Anne Marie Palmieri
8/5/2004 Site Characterization Workplan Approved Comments given on the draft workplan. Workplan will be approved when the activities regarding the dump are added. Anne Marie Palmieri
2/18/2005 Site Ranked Using the AHRM Site reranked with info from draft RI report. Anne Marie Palmieri
2/18/2005 Update or Other Action Staff reviewed and commented on draft RI. DRO contamination was found in the soil and groundwater (16 mg/L); estimated soil volume is 102 cy. Anne Marie Palmieri
10/25/2005 Cleanup Level(s) Approved DEC approves ACLs based on site-specific concentrations of fractional organic carbon: GRO - 397 mg/kg and DRO - 351 mg/kg. Anne Marie Palmieri
6/8/2007 Exposure Tracking Model Ranking ETM ranking Anne Marie Palmieri
2/9/2011 Update or Other Action ADEC recieved a Draft report for the cleanup of the dump and other sites at the FAA Skwentna Air Station. Jonathan Schick
6/10/2011 Update or Other Action ADEC staff submitted numerous comments on the Draft Report detailing the removal of impacted soils at the dump site and around the Skwentna Air Station. Overall the report required thorough revisions to make it more readable and consistent. Also additional characterization and cleanup work remains at the sites and the recommended site closures from the report were not accepted by ADEC. Jonathan Schick
6/13/2011 Update or Other Action ADEC recieved an email from the FAA remedial project manager informing us that the report was going to be rejected and another draft will be submitted. Jonathan Schick
12/29/2011 Document, Report, or Work plan Review - other Contaminated SItes Staff recieved a revised Draft version of the RemedialAction Cleanup Summary Report Demolition and Remediation of the Former FAA Air Station for Skwentna Air Station in our office for review. The report details the excavation and removal of solid waste from the eroding landfill in Skwentna as well as investigations of several other sites associated with the Air Station. Jonathan Schick
2/1/2012 Document, Report, or Work plan Review - other Contaminated Sites Staff submitted a letter to the remedial project manager at the FAA for the Draft Remedial Action Cleanup Summary Report for the Skwentna Air Station. ADEC has concerns about the adequacy of the cleanup effort at the dump site as well as the need to collect analytical samples to characterize several other sites associated with the Air Station. Comments were submitted within the letter and address the State's concerns with the report. Jonathan Schick
11/28/2012 Document, Report, or Work plan Review - other Draft landfill cleanup report received Fred Vreeman
3/12/2013 Update or Other Action Site assigned to Jessica Morris Fred Vreeman
8/8/2013 Site Characterization Workplan Approved The ADEC Contaminated Site Program approved the 2013 Final Work Plan FAA Site Investigation, FAA Station Skwentna, Alaska. The proposed work included investigations at the Non-Directional Beacon (NDB) Bulk Fuel Area, Simultaneous Broadcast Range with Adcock Antenna (SBRA) Range Building, Control Tower (CT) Building, Dump Number 1, Shop Drum Area, Pesticide Sprayer Area, and the NDB Drum Pond Area. Jessica Morris
12/23/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72482 sbra. Jessica Morris
12/29/2014 Site Characterization Report Approved The ADEC Contaminated Site Program approved the 2014 Final Site Investigation and Hydrocarbon Risk Calculator Report for the, FAA Station Skwentna, Alaska. 26 UVOST probes, 15 soil boring, and 22 analytical soil samples were collected from the site. DRO and PAH was detected at the site in an area approximately 35 feet in length from 4 to 8 feet bgs. 4 groundwater monitoring wells were installed at the site, and no contamination were detected in the groundwater samples above the ADEC Table C cleanup levels. Removal of the soil source area contamination was recommended for this site. Jessica Morris
9/8/2016 Meeting or Teleconference Held A project meeting was held to discuss the soil sampling results for the pesticide background sampling. In order to move on to the cleanup portion of this project, we will need to agree on soil and sediment cleanup levels that are protective of all pathways and receptors. Jessica Morris
7/16/2019 Update or Other Action Site location was updated on this date. Coordinates for this site are used to determine the presence and position of the site on BLM’s ANCSA Conveyed Land web map. Rebekah Reams
4/24/2020 Document, Report, or Work plan Review - other Approved remainder of workplan for work occurring in 2020 and 2021 field seasons. Michael Hooper
8/30/2022 Document, Report, or Work plan Review - other Approved interim remedial action report for phases one through three of the remedial action project, ADEC will issue final recommendations and comments upon review of the final project reporting next year. Michael Hooper
6/15/2023 Site Visit Visited Deshka Landing to address community concerns about soils coming from the Skwentna cleanup. Michael Hooper
6/20/2024 Update or Other Action Provided comments on the post remedial action report dated May 2024. Michael Hooper
12/2/2024 Site Characterization Report Approved Approved Final FAA Skwentna Post-Remedial Action Report detailing cleanup, characterization, and risk assessment occuring at FAA Skwentna Areas of Concern in the 2019 through 2023 field seasons. See attached letter for recommendations for each AOC. Michael Hooper

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

No associated sites were found.

Missing Location Data

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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