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Site Report: ADOT&PF Deadhorse Blk 700 Lots 7A & 8


Site Name: ADOT&PF Deadhorse Blk 700 Lots 7A & 8
Address: Block 700, Lots 7A and 8, Deadhorse, AK 99734
File Number: 300.38.177
Hazard ID: 1963
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 70.198689
Longitude: -148.469622
Horizontal Datum:

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

ADOT&PF currently occupies the subject lease lots. Lot 7A supports a maintenance facility for State vehicles, airport services, and heavy equipment storage. Lot 8 borders the western portion of the gravel pad supporting the maintenance shop facilities. During AGRA's 1992 Phase I Assessment of this property, heavily stained surface soils were observed both inside and around the shop facilities. In addition, AGRA noted that some pond surface waters on Lot 8 exhibited a petroleum-type sheen. The phase I pointed to the following areas of concern: drum and materials storage area on the eastern side of the warm storage building, the subsurface soils surrounding the on-site ASTs, the area surrounding the fuel dispensing station, and the maintenance shop floor. During the phase II assessment, AGRA advanced 33 soil borings throughout Lots 7A and 8. The analytical results found no benzene present in any of the samples. Elevated levels of xylene (up to 130 mg/kg) were found as well as DRPH samples (up to 17,000 mg/kg) were found on-site. The elevated DRPH samples were found inside the two shop buildings. Tetrachloroethene (PCE) was found at a concentration of 3.2 mg/kg.

Action Information

Action Date Action Description DEC Staff
11/9/2004 Site Ranked Using the AHRM Preliminary ranking. Deborah Williams
11/9/2004 GIS Position Updated Source of information is All Topo Maps and TopoZone Pro (NAD 27). Reference maps used were site maps. Deborah Williams
1/17/2007 Update or Other Action Site file transferred to Anchorage Kim DeRuyter
4/9/2007 Exposure Tracking Model Ranking Initial ranking Bill O'Connell
6/30/2008 Report or Workplan Review - Other Reviewed Phase II Report for ADOT Deadhorse Maintenance Facility Dated October 1994.Soil samples were collected from boreholes inside and outside the Shop and Warm Storage Buildings, and surface water and sediment samples were collected from adjacent tundra areas. DRO was detected in soil up to 17,000 mg/kg in borehole SB-27. Soil samples from 17 boreholes contained DRO above 500 mg/kg, primarily inside the Shop Building .BTEX was not detected above Method Two cleanup levels. PCE was detected up to 3.2 mg/kg in several boreholes in the Shop Building. Surface water and sediment samples did not contain contaminants at concentrations indicative of contamination, except at sample PS-2 near the former fuel tanks where DRO was detected at 1,400 mg/kg. Bill O'Connell
7/2/2009 Site Characterization Report Approved Reviewed Site Characterization Report dated June 19, 2009. Four soil borings were advanced inside the Shop Building to evaluate contaminant concentrations detected in the 1994 investigation. Soil borings were advanced to a depth of 15 feet bgs and two soil samples were collected from each borehole and analyzed for DRO, RRO, GRO, VOCs, PAHs, and PCBs. DRO was detected up to 3,760 mg/kg in borehole 2 at 8.5 to 11 feet bgs and benzene was detected up to 0.0238 mg/kg borehole 5 at 6-10.5 feet bgs.PCBs were not detected in any sample and PAHs were not detected above cleanup levels. The chlorinated solvents initially detected in the 1994 samples were not detected in 2009 samples. Bill O'Connell
3/22/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72941 Drum and fuel storage. Bill O'Connell
12/26/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72941 Drum and fuel storage. Bill O'Connell
2/26/2013 Update or Other Action Updated coordinates based on comparison of the 2009 work report and Google Earth Imagery. Richard Bernhardt
3/4/2013 Institutional Control Record Established Institutional Controls established and entered into the database. Richard Bernhardt
3/4/2013 Cleanup Complete Determination Issued Contamination may remain onsite above established default cleanup levels; however ADEC has determined there won't be an unacceptable risk to human health or the environment while institutional controls remain in effect. Richard Bernhardt
3/19/2013 Institutional Control Compliance Review IC compliance review conducted and staff changed from Richard Bernhardt to IC Unit. Reminder system set-up to follow-up with the responsible party in 2018. Kristin Brown

Contaminant Information

Name Level Description Media Comments
DRO Maximum Allowable (Arctic only) Soil
Xylenes (total) Maximum Allowable (Arctic only) Soil

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Other ADOT&PF Airport Leasing Office or their designee shall report the functional status of the 2000-era Maintenance Building to ADEC once every five years, or as soon as they become aware of any change in land ownership or use, if earlier.
When Contaminated Soil is Accessible, Remediation Should Occur When the Maintenance building is decommissioned, contaminated soil must be characterized and managed in accordance with an ADEC approved plan.

Missing Location Data

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