Site Report: MarkAir - Dutch Harbor
| Site Name: | MarkAir - Dutch Harbor |
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| Address: | Dutch Harbor Airport, Unalaska, AK 99685 |
| File Number: | 2661.38.004 |
| Hazard ID: | 1765 |
| Status: | Active |
| Staff: | Stacee Henderson, 9072628202 stacee.henderson@alaska.gov |
| Latitude: | 53.897052 |
| Longitude: | -166.539880 |
| 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
In 1993, a Limited Environmental Background Assessment was conducted at the MarkAir Hangar Facility. Two unknown large stockpiles of fill were present on the western portion of the hangar adjacent to an above ground storage tank(AST). A 55-gallon drum of unknown contents and an oil pan containing used oil were present outside of the northwest corner of the hangar. The ground surface in the vicinity of the drum and oil pan was stained. Staining was also observed along the western side of the hanger near the northwest entrance to the hangar. The source of the staining is unknown. A “prominent hydrocarbon odor” was observed inside the hangar as well as floor drains. The floor drains are reportedly discharging into an unknown area. To determine potential extent of soil and groundwater contamination, three soil borings were advanced; two in the unpaved area west and southwest of the building and one south in a paved area.The borings were advanced 11 to 15 feet below ground surface (bgs), until bedrock was encountered. One soil sample collected from each boring at a depth of 2.5 feet bgs contained diesel range petroleum hydrocarbons (DRPH) up to 36.2 mg/kg and total petroleum hydrocarbons (TPH) up to 283 mg/kg. Groundwater was encountered at 6.5 feet bgs in only one bore hole (B1) located west of the building adjacent to the AST. Two groundwater grab samples collected from this boring contained DRPH up to 211 mg/L and TPH up to 169 mg/L.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 8/9/1993 | Update or Other Action | On this date, ADEC received the Report Limited Environmental Background Assessment Markair Hangar Facility Dutch Harbor Airport submitted by Dames & Moore dated July 13, 1993. Two unknown large stockpiles of fill were present on the western portion of the hangar adjacent to an above ground storage tank. A 55-gallon drum of unknown contents and an oil pan containing used oil were present outside of the northwest corner of the hangar. The ground surface in the vicinity of the drum and oil pan was stained. Staining was also observed along the western side of the hanger near the northwest entrance to the hangar. The source of the staining is unknown. A “prominent hydrocarbon odor” was observed inside the hangar as well as floor drains. The floor drains are discharging into an unknown area. Three borings were advanced; two in the unpaved area west and southwest of the building and one south in a paved area. The borings were advanced to 11 to 15 feet bgs, until bedrock was encountered. One soil sample collected from each boring at a depth of 2.5 feet bgs contained DRPH up to 36.2 mg/kg and TPH up to 283 mg/kg. Groundwater was encountered at 6.5 feet bgs in only one bore hole located west of the building. Two groundwater grab samples collected from this boring contained DRPH up to 211 mg/L and TPH up to 169 mg/L. | Grant Lidren |
| 8/26/2004 | Site Added to Database | Former Staff | |
| 2/27/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed. | Pam Clemens |
| 4/27/2010 | Proposed Plan | ADOT&PF is initiating an EA to analyze the proposed airport improvements at the Unalaska/Dutch Harbor Airport called: Unalaska Airport Improvements Project 51501. The improvements include extending both ends of the existing runway and possibly relocating MT. Ballyhoo Road. More information can be found on the DOT website. the name of the project is: Unalaska Airport Improvements Project 51501 | Pam Clemens |
| 4/16/2012 | Update or Other Action | DOT indicates the stockpiles observed in 1993 are no longer on site and the former Markair Builing is currently the Penair Building | Grant Lidren |
| 5/1/2014 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 72743 AST. | Joshua Barsis |
| 11/24/2015 | Update or Other Action | No new information. | Joshua Barsis |
| 6/17/2016 | Update or Other Action | Sent a PRP letter to ADOT | Erin Gleason |
| 6/17/2016 | Update or Other Action | Sent a work plan request letter to ADOT. | Erin Gleason |
| 9/7/2016 | Update or Other Action | ADOT does not have funding for characterization and/or cleanup at this time. | Erin Gleason |
| 7/12/2019 | Update or Other Action | Site location was updated on this date. Coordinates for this site are used to determine the presence and position of the site on BLM’s ANCSA Conveyed Land web map. | Rebekah Reams |
| 4/5/2023 | Potentially Responsible Party/State Interest Letter | Potentially Responsible Party Letter sent to Guardian Flight, Inc. who currently leases Lot 1B, Block 4 of the Dutch Harbor Airport. | Naomi Mason |
| 5/1/2023 | Update or Other Action | Guardian Flight LLC (Global Medical Response) subleases Lot 1B, Block 4 to the U.S. Coast Guard since 10/1/2022. The USCG operates out of the hangar. Guardian Flight LLC has leased the lot since 2013. Lease documents provided on this date by Guardian Flight LLC. | Naomi Mason |
Contaminant Information
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There are no documents for this site report.
No associated sites were found.