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Site Report: AIA Postmark Drive Historic Dump

Site Name: AIA Postmark Drive Historic Dump
Address: Ancorage International Airport; Postmark Drive Right of Way and Lake Hood Bravo parking, S of Tom Wardleigh and W of Aircraft Drive, Anchorage, AK 99502
File Number: 2100.38.028.035
Hazard ID: 26424
Status: Active
Staff: Wendy Hansen, 9072693059
Latitude: 61.181131
Longitude: -149.983433
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.


In 1993, during the Postmark Road reconstruction project, seventeen test borings were advanced at a historic unpermitted solid waste dump site. The dump dates from approximately 1950 and was abandoned in 1973. During the initial investigation, soil samples collected from several of the borings had concentrations of diesel range organics (DRO) up to 612 mg/Kg, polychlorinated biphenyl(PCB) Aroclor 1254 at 29.3 mg/Kg, PCB Aroclor 1260 at 1.04 mg/Kg, trichloroethylene (TCE) at 0.032 mg/Kg, and tetrachloroethylene (PCE) at 0.160 mg/Kg. Soil samples collected from the borings indicated that contaminants were found in isolated areas and were not widespread across the investigation area. Following the investigation, 6,000 cubic yards of debris and soil were removed and disposed of as part of the reconstruction project.

Action Information

Action Date Action Description DEC Staff
7/30/2015 Site Added to Database A new site has been added to the database Mitzi Read
8/3/2015 Potentially Responsible Party/State Interest Letter Lisa Krebs-Barsis
8/5/2015 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79793 name: AIA Postmark Drive Historic Dump Lisa Krebs-Barsis
1/4/2016 Update or Other Action Reviewed a report for geotechnical sampling east of Aircraft Drive and the site. No debris was identified in any of the soil borings. Lisa Krebs-Barsis
7/15/2016 Update or Other Action All of the data from this site came from soil that was removed from the site in 1993. ADOT tested the Postmark Road project limits in 1993, prior to construction, using 17 bore holes in the construction limits right-of-way. 6000 cy yards of soil were removed from the road right-of-way, stockpiled and tested for Lead and PCB's. No detectable levels of PCB was detected and de-minimis levels of Lead were detected in all samples and are considered to be background levels in the Anchorage area. All 6000 cy of soil was sent to the Anchorage Regional Landfill. New ETM was completed with De-minimis or Pathway Incomplete routes of exposure. Cumulative Cancer Risk is 6x10E-6 and Hazard Index is <1. Darren Mulkey

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details


Description Details

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