Site Report: FAA McGrath Air Sp Bldg 406 UST F
| Site Name: | FAA McGrath Air Sp Bldg 406 UST F |
|---|---|
| Address: | McGrath Airport; , McGrath, AK 99627 |
| File Number: | 2612.38.001 |
| Hazard ID: | 22896 |
| Status: | Active |
| Staff: | Sophia Bracio, 9074511682 sophia.bracio@alaska.gov |
| Latitude: | 62.957384 |
| Longitude: | -155.599764 |
| Horizontal Datum: | WGS84 |
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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
11/20/2018: This site has historically been tracked under two Hazard IDs: 1888 and 22896. Based on a file review, Tank 16-B-11 was closed on 10/30/1993, and subsequently replaced with Tank 16-B-111. The UST database indicates that Tank 16-B-111 was closed out on 10/1/2009. Hazard ID 22896 is linked with the UST Database and all future activity for the Former FSS, Building 406 UST will be tracked under Hazard ID 22896. All relevant entries from duplicate Hazard ID 1888 have been copied and Hazard ID 1888 will no longer appear in the public database. 12/5/2017: The Former FSS Building 406 underground storage tank (UST 16-B-11) was a 3,000-gallon heating oil UST located between FSS Building 406 and Chinana Road in McGrath, Alaska. UST 16-B-11 was decommissioned in 1993 and soil samples were collected from the excavation. Soil samples on the north, south and west walls of the excavation had DRO concentrations exceeding cleanup levels, while samples from the east wall and floor of the excavation had DRO concentrations below cleanup levels. In 2011, a total of 15 ultraviolet optical screening tool (UVOST) probes were advanced to investigate the extent of contamination. Eight soil borings were advanced and seven soil samples were collected for laboratory analysis. Analytical samples included seven samples for DRO and RRO, and two samples for PAH analysis. No soil samples were analyzed for EPH, VPH, TOC, bulk density, grain size, specific gravity, or moisture content. DRO concentrations in soil were greater than ADEC Method Two, Under 40-Inch Zone, Migration to Groundwater cleanup levels in 2 of the 7 soil samples analyzed for DRO (5,470 and 5,970 mg/kg). All other analytical results were less than cleanup levels. The source area is estimated to be approximately 30 feet long and 20 feet wide, with contaminated soil extending from the surface to about the 11-feet deep. With regard to groundwater, in 2011 one new monitoring well (MW-105) was installed in the former FSS Building 406 source area to a depth of approximately 21.4 feet below ground surface (bgs). Groundwater samples were analyzed for DRO, RRO, GRO, BTEX, and PAHs. No analytes were detected at concentrations greater than the ADEC 18 AAC 75 Table C groundwater cleanup levels.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 10/26/1993 | Leaking Underground Storage Tank Release Confirmed - Petroleum | LUST Site created in CSP for source area ID 75841 ADD; | Former Staff |
| 10/26/1993 | Site Added to Database | Former Staff | |
| 6/1/1994 | Underground Storage Tank Site Characterization or Assessment | SA1R; | Former Staff |
| 6/1/1994 | Update or Other Action | NOR; | Former Staff |
| 7/15/1994 | Update or Other Action | CAPR; Reviewed a corrective action plan. | Former Staff |
| 11/1/1994 | Leaking Underground Storage Tank Cleanup Initiated - Petroleum | LCAU; | Former Staff |
| 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 | Document, Report, or Work plan Review - other | Entry copied from Duplicate Hazard ID 1888 on 11/20/2018: 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. | Jamie McKellar |
| 7/28/2005 | Meeting or Teleconference Held | Entry copied from Duplicate Hazard ID 1888 on 11/20/2018: 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. | Jamie McKellar |
| 1/26/2006 | Update or Other Action | Entry copied from Duplicate Hazard ID 1888 on 11/20/2018: All work performed for the Federal Aviation Administration (FAA) requires completion and approval of a Project Environmental and Occupational Safety and Health Worksheet (EOSH Worksheet). The EOSH Worksheet is a tool that allows project managers to identify potential hazards and contamination, take appropriate measures to avoid hazards and manage contamination appropriately, to minimize environmental impacts, determine whether environmental assessment is required prior to beginning work, and to minimize fines and/or penalties associated with non-compliance with federal and state regulations. It also acts a mechanism to identify when outside agency permits are necessary. Specific portions of the EOSH Worksheet address: the presence/absence of endangered species, activities conducted in wetlands or anadromous streams, whether work will occur on a contaminated site or involve activities associated with fuel tanks, fuel distribution lines, oil-containing transformers, groundwater monitoring wells, floor drains, and generation and handling of hazardous waste. To ensure all issues are appropriately considered, the worksheet is to be reviewed after each phase of project development and implementation. This form is to be kept with project progress documents throughout the project. | Jamie McKellar |
| 8/2/2011 | Site Characterization Workplan Approved | Entry copied from Duplicate Hazard ID 1888 on 11/20/2018: Approved the Final Work Plan, Federal Aviation Administration (FAA) Release Investigation, FAA Station, McGrath, Alaska, describing investigation activities at 14 areas of concern at the FAA McGrath Station. An Ultra-Violet Optical Screening Tool (UVOST)/laser-induces fluorescence (LIF) probe will be used as a screening tool to investigate the horizontal and vertical extent of petroleum contamination. Locations of soil borings and groundwater monitoring wells will be determined based on site conditions and the UVOST/LIF screening results. | Jamie McKellar |
| 2/23/2015 | Document, Report, or Work plan Review - other | Approved final 2013 release investigation at 11 areas of concern. Sample results from the Former FSS Building 406 UST site shows contaminated soil remains at this site. Groundwater sample results are below cleanup levels. | Melody Debenham |
| 12/9/2016 | Update or Other Action | Teleconference with FAA project manager to discuss future actions at FAA McGrath sites. | Melody Debenham |
| 4/7/2017 | Meeting or Teleconference Held | Entry copied from Duplicate Hazard ID 1888 on 11/20/2018: On April 7, 2017, FAA and ADEC met via teleconference. ADEC advised FAA that since the Record of Decision was prepared based on previous cleanup levels using the HRC, ADEC will not be able to use the July 2016 report as a basis for decision making and/or alternative cleanup levels. | Jamie McKellar |
| 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 |
Contaminant Information
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There are no documents for this site report.
No associated sites were found.