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Site Report: ADOT&PF - McGrath Airport - Retardant Ramp

Site Name: ADOT&PF - McGrath Airport - Retardant Ramp
Address: McGrath Airport; , McGrath, AK 99627
File Number: 2612.26.003
Hazard ID: 23291
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229
Latitude: 62.945473
Longitude: -155.609047
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.


The site is owned by the State of Alaska ADOTPF, it is leased by BLM and sub leased to DNR for fire suppression activities. The site was originally used by the military and the runway was built over an old dumpsite and buried drums have been visible off the end of the runway following spring flooding. There are reports of BLM fuel spills in the early 1970's. ADNR (Division of Forestry) removed two underground.fuel tanks in 1991. Soil and groundwater contamination was noted in assessments in 1991; 1993; 1995; 1997 and 2001. Since the site was active (ie continued use as a fire fighting staging area) cleanup options were limited. A soil vapor extraction system operated from 1995 until it was removed in 2007.

Action Information

Action Date Action Description DEC Staff
6/11/1991 Leaking Underground Storage Tank Cleanup Initiated - Petroleum * Not Assigned
6/11/1991 Update or Other Action NOR; Notice of Release Letter sent to DNR (copies to ADOT/PF and BLM) on August 6, 1991. Letter was in response to a report that one of the USTs was leaking. * Not Assigned
6/11/1991 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77688 ADD; * Not Assigned
6/11/1991 Site Added to Database * Not Assigned
3/9/1992 Underground Storage Tank Site Characterization or Assessment SA1; DNR submitted a December 1991 site assessment report for the UST closure at the McGrath Airport Retardant Ramp documenting the August 1991 removal of the two 5000 gallon underground fuel tanks. The report identified extensive soil and groundwater contamination and recommended submittal of a corrective action plan by April 30, 1992. * Not Assigned
3/9/1992 Update or Other Action CORR; Following review of the site assessment report for UST closure, DEC requested DNR submit a corrective action plan by not later than 4/30/92. * Not Assigned
4/27/1992 Update or Other Action CORR; DNR submitted a memo with a proposal for conducting a release investigation. The memo stated that work may be delayed due to a lack of funding and conflicts over use of the ramp. * Not Assigned
9/1/1993 Underground Storage Tank Site Characterization or Assessment Hart Crowser report that provided historic information about the retardant ramp site; soil and groundwater data from 25 soil borings and 4 groundwater wells; and a geophysical survey of the ramp area. The data identified soil and groundwater impacts in the area of the former underground tanks. GW flow direction was thought to be easterly towards the runway. Jim Frechione
7/26/1995 Leaking Underground Storage Tank Corrective Action Underway Department receives copy of July 1995 Insitu Remediation System Installation report. Documents a semi-active SVE system installed by S&W. * Not Assigned
11/17/1999 Leaking Underground Storage Tank Corrective Action Underway ADEC receives a Site Characterization and Remediation Plan by S&W. Objective is to aggressively pursue soil vapor extraction at the site, focusing on soil in the vadose zone. There were 31 soil borings and 2 monitor wells installed that identified elevated contamiantion again in the former UST area. * Not Assigned
12/16/1999 Update or Other Action DEC approves workplan summarizing aggressive remediaion effort. Proposed installation and operation schedule is for 2000. DEC also indicates that based on present analytical data, no additional remediation will be required under the runway area. Recommend additional monitoring and minor revisions. * Not Assigned
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
2/7/2007 Exposure Tracking Model Ranking * Not Assigned
2/1/2008 Update or Other Action Shannon & Wilson report that provided information on decommission the soil vapor extraction system in place. It was under the paved apron and a water tank. Three groundwater wells were identified and one was inaccessible (beneath a shed); one was dry (it was decommissioned) and one was sampled (and then decommissioned). Groundwater remains above ADEC cleanup levels near the runway. Jim Frechione
2/12/2008 Conditional Closure Approved DEC decision document that recognizes soil and groundwater contamination remain on site but it remains an active fire suppression staging area and the contamination was determined to be stable. Site specific conditions were established that require DEC contact before soil or groundwater are proposed for off site transport and groundwater wells are prohibited w/out DEC approval Jim Frechione
2/12/2008 Institutional Control Record Established No further cleanup actions are required subject to: 1.The owner/operator of this site shall not excavate, transport or discharge soil or groundwater off site without prior notification to ADEC. In the event soil excavation or groundwater discharge is proposed, ADEC shall be contacted to review and approve of the proposed action. It should be noted that a qualified environmental contractor may be required to provide environmental oversight in accordance with 18 AAC 75 regulations. 2.No groundwater extraction wells shall be installed on site without the prior review and approval by ADEC. 3.A Notice of Environmental Contamination will be posted on the ADEC database to identify issues and/or conditions associated with the residual contamination remaining on site. This notice shall also be provide to ADOTPF Airport Leasing to ensure that terms and conditions of this decision document are incorporated into any future lease agreements when (or if) the property is conveyed to another party Jim Frechione
6/30/2011 Update or Other Action Transferred Project Manager to IC Unit Bianca Reece
3/4/2016 Institutional Control Compliance Review IC compliance review conducted. Verified the landowner and issued an IC reminder letter on this date. Reminder system set to follow-up in 2021. Kristin Thompson

Contaminant Information

Name Level Description Media Comments
Benzene > Table C Groundwater
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Lead - Total > Table C Groundwater
GRO > Table C Groundwater
DRO > Human Health/Ingestion/Inhalation Soil
BTEX Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP site is state owned airport facility. site conditions will be listyed on DEC database and provided to ADOTPF airport leasing


Description Details
Groundwater Use Restrictions DEC approval is required prior to any proposal to install groundwater wells; and for off site tranport of soil and groundwater contact DEC for approval prior to any proposed groundwater wells and any off site transport of soil or groundwater
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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