Site Report: ADOT&PF Gulkana Airport Blk 21 Lease Lots
| Site Name: | ADOT&PF Gulkana Airport Blk 21 Lease Lots |
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| Address: | Richardson Highway, 8 miles SW of Gulkana / 5 miles NE of Glenallen, Glennallen, AK 99588 |
| File Number: | 140.57.001 |
| Hazard ID: | 25350 |
| Status: | Informational |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 62.155200 |
| Longitude: | -145.461100 |
| 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
The Gulkana Airport was built during World War II by the United States Air Force. The majority of properties and facilities at the airport were transferred to DOT in 1966. According to a 1993 Ecology and the Environment (E&E) report for U.S. Army Corps of Engineers, 44 drinking water wells are within a 4 mile radius of the airport. The depths of the wells range from 27 to 437 feet below ground surface. Sub-permafrost groundwater occurs in unconsolidated deposits at depths from 243 feet to 248 feet below ground surface. A soil boring drilled in the area indicated that frozen glacial silt was present to a depth of 85 feet, underlain by up to 100 feet of unfrozen glacial silt, which was on top of layers of several hundred feet of sand, gravel, and silt. Surface soils are generally made up of poorly drained organic soils with thick organic surface horizons and mottled clay subsoil horizons. Permafrost occurs within two feet of the surface in poorly drained areas. The property located at Block 21, Lot 2A is a contaminated site on DEC’s Contaminated Sites Database. According to the file, three underground storage tanks (USTs) located at the Gulkana Air Service were excavated and removed on September 27, 1997. The south and west sides of the excavation were in close proximity to the hangar. The contaminated soil that was encountered during the removal of the tanks was placed back into the excavation. The bottoms of the USTs were approximately 8 feet bgs. No groundwater was encountered during the excavation. During the 1997 site assessment, confirmation soil samples were analyzed for gasoline range organics (GRO), diesel range organics (DRO) and benzene, toluene, ethylbenzene and xylenes (BTEX). GRO was detected at levels up to 3,530 milligrams per kilogram (mg/kg) and benzene up to 43 mg/kg (8.5 feet below ground surface (bgs)). The environmental history for Lots 3A and 4A are not documented in the DEC files. DOT is the owner of the property and has had great difficulty leasing Lots 3A and 4A due to tenant’s fears of assuming potential site liabilities from the contamination identified on Lot 2A. Questions remain as to whether activities at lot 2A have contaminated adjacent lots.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 2/12/2009 | Site Added to Database | A new site has been added to the database | Deborah Williams |
| 2/27/2009 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 78725 name: Lots 3A and 4A | Deborah Williams |
| 3/10/2009 | Brownfields Award | Notice to proceed was awarded to Oasis through SPAR term contract. Project managed under Reuse and Redevelopment Program. FY 2010 State of Alaska Capital Improvement Project funds $60,374 awarded for a limited site characterization at ADOT&PF Gulkana Airport. Current status: Project complete. | Deborah Williams |
| 10/6/2009 | Update or Other Action | DEC received a draft Site Characterization report for the Gulkana Airport Lease Block 20 and 21. Twenty-five soil borings were advanced to a minimum depth of 10 feet bgs and a max depth of 20 feet bgs depending on the field screening results in each boring. The predominant soil type below 5 feet bgs was clay; there was a thin perched groundwater layer on top of the clay in most of Block 21, Lot 1A. A total of 13 soil samples (plus 2 duplicates) were analyzed for GRO, DRO, RRO, BTEX and lead. Two samples were analyzed for PAHs and 4 samples were analyzed for VOCs. Shallow groundwater was encountered in ten of the soil borings; a gw sample was collected from a temp monitoring well screened from 2.5 feet bgs to 4 feet bgs and analyzed for GRO, DRO, and BTEX. Conclusion from this report are the following: Block 20, Lots 1 and 3A: Field screening and lab confirmation samples showed no evidence of impact. Block 21, Lot 2A: The area immediately surrounding a 1997 former UST excavation has detections of GRO, benzene, and xylenes but not above human health risk-based cleanup levels. Sample results indicate that the contamination associated with the former UST excavation is limited in areal extent and does not extend as far south as the hangar or as far east as Block 2/3 boundary. Block 21, Lot 3A: Field-screening and a lab confirmation sample showed no evidence of impact. Block 21, Lot 1A: Lab results indicate two areas of soil contamination associated with two former ASTs in Block 21, Lot 1A above DEC Health-based cleanup levels. | Deborah Williams |
| 4/30/2010 | Update or Other Action | The source area/ETM ranking was deleted from the database because the report determined that the designated source area was not contaminated. A new site was created as a result of this sampling "Gulkana Airport Lot 1A". A source area was created for the new site and ranked accordingly. The status of this site was changed from active to informational. | Deborah Williams |
| 9/27/2021 | Update or Other Action | Staff assigned changed to "no longer assigned" as the site does not appear to have confirmed contamination. Site retains its "informational" status as it was originally addressed through ADEC's Reuse and Redevelopment Program. For further information, please contact ADEC Brownfields staff. | Lisa Griswold |
Contaminant Information
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Requirements
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There are no documents for this site report.
No associated sites were found.