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Site Report: ADOT&PF Deadhorse Airport Block 304 Lot 2A


Site Name: ADOT&PF Deadhorse Airport Block 304 Lot 2A
Address: Deadhorse Airport Block 304 Lot 2A, Deadhorse, AK 99734
File Number: 300.38.318
Hazard ID: 26413
Status: Active
Staff: Joshua Barsis, 9072697691 joshua.barsis@alaska.gov
Latitude: 70.198949
Longitude: -148.458199
Horizontal Datum:WGS84

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 June 2015 two test pits were advanced on Lot 2A of Block 304 at the Deadhorse airport to verify the presence or absence of contamination from onsite and offsite sources. Results of the investigation revealed that contamination was present in the soils on the southwestern portion of the property, in the in the vicinity of one or more former above ground storage tanks (ASTs) removed in 2009. Diesel range organics (DRO) was identified at 1,540 mg/kg, which exceeds ADEC cleanup levels. The extent of this contamination has not been fully delineated.

Action Information

Action Date Action Description DEC Staff
6/29/2015 Site Added to Database A new site has been added to the database Mitzi Read
7/7/2015 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79785 name: ADOT&PF Deadhorse Airport Block 304 Lot 2A Joshua Barsis
7/10/2015 Potentially Responsible Party/State Interest Letter Letter state interest sent. Joshua Barsis
7/10/2015 Report or Workplan Review - Other Reviewed the Phase II Environmental Site Assessment Report, dated June 22, 2015. Seven analytical soil samples were collected from six test pits advanced on Lots 2A and 2C in June 2015. The main goal of this effort was to verify the presence or absence of contamination from onsite and offsite sources; mainly the potential for contamination migrating from the ADOT&PF Deadhorse Airport Lot 1B Block 304 site. Results of the investigation revealed that contamination was present in the surface and subsurface soils on Lot 2C, located along the western boundary and adjacent to Lot 1B. However, all soil sample results were below ADECs most stringent cleanup levels. Contamination was also identified in Sample L2A2, which was collected from a test pit advanced on Lot 2A, in the vicinity of a former above ground storage tank (AST) removed in 2009. Diesel range organics (DRO) was identified in Sample L2A2 at 1,540 mg/kg, which exceeds ADEC cleanup levels. The extent of this contamination has not been fully delineated. See file number 300.38.318 for full text report. Joshua Barsis
10/7/2015 Report or Workplan Review - Other Reviewed the Cleanup Plan, dated August 12, 2015 for the ADOT&PF Deadhorse Airport Block 304 Lot 2A site. The plan includes provisions for limited excavation and sampling activities. Joshua Barsis
12/4/2015 Report or Workplan Review - Other Reviewed the Cleanup Report: 2015 Soil Removal Action, dated December 1, 2015. Excavation commenced in mid-September 2015 to remove contaminated soil impacted with diesel range organics (DRO) above the Method One cleanup level of 500 mg/kg. Roughly 35 cubic yards of soil was removed and disposed of at the Oxbow Landfill in Deadhorse. The excavation was approximately 25 feet long, 20 feet wide, and ranged in depth from 2 to 3 feet below ground surface (bgs). Seven confirmation soil samples (four from the excavation sidewalls and three from the base) were collected and analyzed for one or more of the following: gasoline range organics (GRO), DRO, residual range organics (RRO), and benzene, toluene, ethylbenzene, and xylenes (BTEX). One sample was also analyzed for polynuclear aromatic hydrocarbons (PAHs). In addition to the excavation confirmation soil samples, one surface water sample was collected from the ponded water beneath the eastern adjacent hanger building. The surface water sample was analyzed for total aromatic hydrocarbons (TAH) and total aqueous hydrocarbons (TAqH). Analytical results revealed that DRO impacted soil remains in the pad material up to 1,350 mg/kg. Surface water analytical results did not exceed Alaska Water Quality Standards (AWQS). In a letter sent December 2015, ADEC requested a work plan by February 1, 2016 to delineate the extent of contamination above Method One cleanup levels in the soil and pad-pore water. Joshua Barsis

Contaminant Information

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