| Action Date |
Action |
Description |
DEC Staff |
| 9/6/1990 |
Update or Other Action |
(Old R:Base Action Code = SI - Site Investigation). Written report from FAA states that sample results showed contamination of total petroleum hydrocarbons ranging from 188 to 885 mg/kg. Only trace or non-detectable amounts of BETX. |
Former Staff |
| 9/30/1990 |
Site Added to Database |
Petroleum contaminant. |
Former Staff |
| 8/9/1991 |
Site Number Identifier Changed |
Old# 90220122601 New# 90250122601 Western district now. |
Former Staff |
| 12/1/1994 |
Update or Other Action |
(Old R:Base Action Code = CORR - Correspondence (General)). These sites are all to be coordinated by Kent Patrick-Riley with CC to WDO. |
Ray Dronenburg |
| 4/26/1996 |
Site Ranked Using the AHRM |
Site ranked by Shannon and Wilson. |
S&W |
| 6/25/1998 |
Update or Other Action |
Staff approved a contaminated soil management plan on short notice which involved excavation and stockpiling of an estimated 2000 cubic yards of contaminated soil during the construction of a State road across FAA's former tank farm site. |
Eileen Olson |
| 7/30/2001 |
Cleanup Plan Approved |
Letter sent to FAA granting conditional approval to conduct a pilot project on landspread soils, using a surfactant product, "MicroSolv". The workplan proposed creating a 50-ft. by 100-ft. test plot, and placing an 8-inch thick lift of diesel contaminated soils. ADEC requires an underlying permeable marker layer to distinguish the contaminated soils to be treated from the underlying native soils. |
Eileen Olson |
| 9/7/2001 |
Update or Other Action |
Email sent to FAA and Chemtrack addressing staff concerns about the lack of communication regarding the pilot project as was required in the conditional approval letter of August 10, 2001. Staff have not received any communication since August 10, 2001 until staff contacted Carl Gysler 9/5/01, when it became known that the pilot project was underway. Email also requested the status of the project and information regarding the soil that was used for the landspread operation. |
Eileen Olson |
| 9/27/2001 |
Update or Other Action |
Received sample results from the native soil at the landspreading site taken prior to landspreading. The results of one test pit showed concentrations of up to 26,200 mg/kg DRO. Staff sent email to ChemTrack requesting ChemTrack submit field notes, trench logs, chain of custody form for those samples and information regarding the physical observations of the contaminated soil. |
Elizabeth Stergiou |
| 7/14/2003 |
Update or Other Action |
ADEC approved a workplan with the following scope of work:
Decommissioning of monitoring wells from prior remedial investigations, MW-7 at the RCAG and MW-11 at the NDB.
Site investigation to determine the extent of contamination discovered at the former treatment cell location.
Monitoring and evaluation of the active Hobby Shop SVE system.
Monitoring and evaluation of the active SVE system at Building 305/604.
Subsurface soil sampling at the former Power House.
Implementation of long-term groundwater monitoring at the former tank farm.
Investigate petroleum contamination on the private property at the former tank farm.
Evaluation of natural attenuation along former pipeline and at the former FSS.
Survey the monitoring wells in the quarters and tank farm area and prepare a groundwater contour map.
Removal of abandoned pipeline and relase investigation. |
Deborah Williams |
| 6/9/2005 |
Meeting or Teleconference Held |
ADEC received a Site Investigation and Remedial Evaluation Report. The report includes recommendations based upon outputs of Geosphere's 4-phase model and recommends no further remedial action at several sites where contaminant concentrations exceed the maximum allowable limit of 12,500 mg/kg DRO. The 4-phase model has not yet been verified for accuracy. ADEC discussed this with the FAA and will recommend that siol above the maximum allowable concentration be removed during airport upgrades tentatively scheduled for summer 2006. |
Sharon Richmond |
| 7/28/2005 |
Site Characterization Report Approved |
Contaminated Sites (CS) staff reviewed and provided comments to the Federal Aviation Administration's Site Investigation and Remedial Evaluation Report at the McGrath Airport. Numerous areas contaminated with petroleum were addressed during this investigation. Several air sparge/soil vapor extraction systems have been operating but recovery of fuel has diminished because volatile fuel components have been mostly removed; these systems will be shut down and decommissioned. Other areas still have residual diesel contamination but, in general, concentrations of benzene, toluene, ethylbenzene, and xylenes are below cleanup levels in soil and groundwater. Contamination that has migrated off-site will be excavated and managed as part of remedial efforts at the former tank farm area. CS staff recommended that all soil with contamination above the maximum allowable concentration be excavated and that a treatment strategy be developed. A resident of McGrath contacted the Department regarding off-site contamination.The individual was provided with a copy of the report and the comment letter. |
Sharon Richmond |
| 1/11/2010 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 72013 name: FAA McGrath RCAG Site |
Melody Debenham |
| 8/17/2015 |
Update or Other Action |
Requested site status update from FAA. |
Melody Debenham |
| 12/9/2016 |
Update or Other Action |
Teleconference with FAA project manager to discuss future actions at FAA McGrath sites. |
Melody Debenham |
| 4/19/2017 |
Document, Report, or Work plan Review - other |
Letter sent to FAA advising that no response is required for the Department's December 2016 correspondence. Since multiple AOCs were evaluated using the HRC, ADEC will not be able to use the July 2016 report as a basis for decision making. ADEC will re-evaluate FAA McGrath AOCs that appear ready for closure. Some sites may be eligible for cleanup based on a cumulative risk evaluation. Other sites require additional investigation and/or remediation by FAA. |
Jamie McKellar |
| 2/7/2020 |
Update or Other Action |
RCAG Site File Review: The source of contamination at this site was a former 500-gallon gasoline underground storage tank. Based on a letter dated 1990 and a CS Database entry, three confirmation samples were collected below the tank in 1990, but no information is available regarding sample depth, location, etc. Of the three samples collected, two of them exceeded the current Migration to Ground water cleanup level. A single soil sample was collected from the excavation in 1991, but the depth of that sample was not recorded. Three samples were collected five feet away from the source area in 1994. Groundwater samples have not been collected. Approximately 10 cubic yards of contaminated soil was stockpiled 25 feet from the excavation. The status of the stockpile is unknown. Based on the available information, there are no exceedances of Human Health cleanup levels; however, more site information is needed. |
Jamie McKellar |
| 2/7/2020 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 72013 FAA McGrath RCAG Site. |
Jamie McKellar |
| 8/10/2022 |
Document, Report, or Work plan Review - other |
Review and provide comments on DRAFT McGrath FAA Station Release Investigation, Groundwater Monitoring, and Risk Calculation Work Plan, dated July 2022, which was received on July 13, 2022. This work plan describes the methods that will be used to conduct a release investigation, groundwater monitoring, and risk calculation at the Federal Aviation Administration Station in McGrath, Alaska. The areas of concern investigated include the Former Building 405 Underground Storage Tank 16-D-1, the Flight Service Station (FSS) Pipeline, the FSS Building 400 Aboveground Storage Tanks, the Old Pipeline, and the Drum Storage and Pesticide Sprayer. |
Sarah Mutter |
| 9/9/2022 |
Document, Report, or Work plan Review - other |
DEC approves the Final McGrath FAA Station Release Investigation, Groundwater Monitoring, and Risk Calculation Work Plan |
Sarah Mutter |
| 6/6/2023 |
Site Characterization Report Approved |
REPORT APPROVED: Final McGrath FAA Station Release Investigation, Groundwater Monitoring, and Risk Calculation Report, McGrath, Alaska (Brice Solutions, LLC, June 2023) |
Ross Renick |
