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Site Report: ADOT&PF Dillingham Airport Maintenance Facility


Site Name: ADOT&PF Dillingham Airport Maintenance Facility
Address: Dillingham Airport; N Side of ADOT&PF Storage Bldg Near N End of Taxiway C, Dillingham, AK 99576
File Number: 2540.38.020
Hazard ID: 26218
Status: Active
Staff: Erin Gleason, 9072697556 erin.gleason@alaska.gov
Latitude: 59.045423
Longitude: -158.512948
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

On April 18 and 22, 2013 two releases of #1 diesel fuel were discovered at the ADOT&PF maintenance facility at the Dillingham airport, on the north side of the ADOT&PF storage building near the north end of Taxiway C. The first spill was estimated at 20-50 gallons from the bottom of the fuel dispenser, and the second was estimated at 30-40 gallons from a loose fitting on the 400-gallon fuel tank. After initial remedial activities, diesel range organics, gasoline range organics, benzene, and ethylbenzene remain in subsurface soil in excess of DEC cleanup levels. Excavation was limited under storage tanks and beneath facility fencing.

Action Information

Action Date Action Description DEC Staff
3/3/2014 Potentially Responsible Party/State Interest Letter PRP/State Interest letter sent by PERP staff Gay Harpole to ADOT&PF on this date. Mitzi Read
3/6/2014 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PERP staff Gay Harpole. Spill no. 13269910901; spill date in PERP database = 4/19/13 (discovery date = 4/18/13); substance = #1 diesel; quantity ~90 gallons; source = 400-gallon fuel tank fitting and dispenser. Mitzi Read
3/7/2014 Site Added to Database A new site has been added to the database Mitzi Read
3/10/2014 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79616 name: #1 Diesel - 400-Gallon Fuel Tank & Dispenser Mitzi Read
6/4/2014 Report or Workplan Review - Other The Contaminated Sites Program (CSP) completed a review of the Dillingham Airport Fuel Spill Cleanup report, dated October 9, 2013. Two diesel spills were discovered by the Alaska Department of Transportation & Public Facilities (ADOT&PF) in April of 2013; both releases were estimated between 20 and 50 gallons. ADOT&PF staff removed approximately 5 cubic yards of visibly saturated soil, which was temporarily stored in 55-gallon drums, until further action could be taken. In September of 2013, Michael L. Foster & Associates, Inc. (MLFA) performed an excavation to remove the remaining contaminated soils. During excavation, contamination was encountered from the surface to roughly 9 feet below ground surface (bgs). Eight confirmation soil samples, including two duplicates, were collected from the base of the excavation. One soil sample, collected from the western portion of the excavation, exhibited concentrations of diesel range organics (DRO) at 17,800 mg/kg, benzene at 0.0485 mg/kg, ethylbenzene at 10.6 mg/kg, and gasoline range organics (GRO) at 315 mg/kg; all of which exceed the Alaska Department of Environmental Conservation (ADEC) cleanup criteria. None of the other soil samples exhibited contaminants above the ADEC cleanup criteria. The extent of contamination is not defined to the west or northwest. In addition to the above-described work, two baseline soil samples were collected from a proposed land farm location; neither soil sample exhibited contaminant concentrations that exceeded the ADEC cleanup criteria. Joshua Barsis
6/4/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79616 #1 Diesel - 400-Gallon Fuel Tank & Dispenser. Joshua Barsis
6/18/2014 Update or Other Action The ADOT&PF submitted additional information on the drinking water wells located in Dillingham. There are four public drinking water wells located within the city limits of Dillingham, which is located roughly 1.3 miles from this site. The public drinking water wells supply water to residents within the city limits of Dillingham and to the airport. All other residents have private wells; however, there are no private wells located on airport property. Most drinking water wells in Dillingham average a depth of about 95 feet bgs. In addition to the drinking water wells, wetlands are located adjacent to the airport. Joshua Barsis
11/24/2015 Update or Other Action No new information. Joshua Barsis
7/19/2016 Report or Workplan Review - Other Received Land farming test report from ADOT Erin Gleason
7/21/2016 Update or Other Action On 10/20/2015 ADEC approved a land farm testing work plan submitted by ADOT. Land farm is currently being managed and sampled according to this plan. Erin Gleason
8/2/2016 Update or Other Action ADEC has received and approved the transport, treatment, & disposal approval form for contaminated media form from ADOT M&O. They will spread the contaminated soil in place at the landfarm site. Erin Gleason
9/1/2016 Update or Other Action Spoke with Eric Norberg at ADOT today via phone. The original drums of contaminated soil were added to the stockpile. (The stockpile was completed in summer 2016) Erin Gleason
11/20/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79616 #1 Diesel - 400-Gallon Fuel Tank & Dispenser. Erin Gleason

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

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