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Site Report: ADOTPF - McGrath Airport Maintenance Station


Site Name: ADOTPF - McGrath Airport Maintenance Station
Address: McGrath Airport, McGrath, AK 99627
File Number: 2612.26.004
Hazard ID: 25124
Status: Active
Staff: Chelsy Passmore, 9072697522 chelsy.passmore@alaska.gov
Latitude: 62.954433
Longitude: -155.600404
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

A 3,000-gallon diesel underground storage tank (UST) (Tank 1), a 500-gallon used oil UST (Tank 2), and a 1,000-gallon diesel UST (Tank 3) were removed in June 1999 by Shannon & Wilson, Inc. Samples collected from the Tank 1 and 3 excavations contained diesel range organics (DRO) up to 15,900 parts per million (ppm). Concentrations of benzene, toluene, ethyl benzene, and xylenes (BTEX) were below reporting levels. Samples also contained 4.05 ppm arsenic and 86 ppm naphthalene. Samples collected from the Tank 2 excavation contained DRO up to 21,400 ppm and residual range organics (RRO) up to 43,500 ppm, the stockpiled material contained up to 321 ppm DRO and 8.04 ppm arsenic and was used as backfill. Approximately 50 cubic yards of material were removed from the excavations of Tanks 1 and 3 and stockpiled in a storage cell constructed on-site. The stockpiled material contained above cleanup levels of gasoline range organics (GRO), DRO, benzene, and ethylbenzene. A drum of water and sludge that was extracted from the tanks is also temporarily stored on site. Tanks 1 and 3 were reportedly in fine condition with minimal corrosion, while Tank 2 was reported to have a split along one end, which was assumed to be the source of the associated contamination. The full extent of contamination is not known at this time and is likely to be migrating with the groundwater toward surrounding watersheds or the village water system, approximately one mile from the excavation site. Groundwater was not encountered in the excavation which was 12 feet below ground surface. The Village water system is about one mile from the site and is a surface water system. However, private wells may exist in the vicinity of the site. Associated piping for the UST were disconnected and left in place. The length of the piping was not investigated.

Action Information

Action Date Action Description DEC Staff
6/8/1999 Leaking Underground Storage Tank Cleanup Initiated - Petroleum * Not Assigned
6/8/1999 Site Added to Database * Not Assigned
6/8/1999 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77519 S&W conducts UST removal on this date. Contamination is identified and tanks removed. * Not Assigned
8/31/1999 Underground Storage Tank Site Characterization or Assessment S&W submits 8/99 SA. Contaminated stopckpile onsite, and some contaminated material pushed into hole (tank no. 2 area - waste oil). Likely funding eliminated the ability to conduct any additional work at this site. * Not Assigned
4/27/2000 Update or Other Action JBC sends NORL letter to ADOT in Anchorage. * Not Assigned
8/21/2002 Update or Other Action RECKEY has automatically been generated. Cynthia Pring-Ham
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
9/27/2005 Report or Workplan Review - Other Update GIS using Topozone Pro and site maps. Accuracy of site maps was less than optimal. Updated the problem statement and reviewed the UST Closure Assessment Report. Kim DeRuyter
7/2/2008 Exposure Tracking Model On Hold Attempting to locate file. Todd Blessing
10/28/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 77519 name: UST Janice Wiegers
12/23/2009 Update or Other Action File is still missing. Todd Blessing
7/28/2010 Update or Other Action A letter was sent to ADOT&PF requesting a release investigation. Todd Blessing
3/25/2014 Update or Other Action File found. Meghan Dooley
12/16/2014 Update or Other Action Updated the latitude and longitude on the CS map. Lisa Krebs-Barsis

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

There are no documents for this site report.

Missing Location Data

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