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Site Report: ADOT&PF Ekwok Airport Former Equipment Bldg


Site Name: ADOT&PF Ekwok Airport Former Equipment Bldg
Address: Ekwok Airport, SW End of Runway, Ekwok, AK 99580
File Number: 2545.38.003
Hazard ID: 25568
Status: Active
Staff: Sammi Castle, sammi.castle@alaska.gov
Latitude: 59.351017
Longitude: -157.477478
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

ADEC PERP received an anonymous complaint on August 6, 2009, about fuel spills at the Ekwok Airport where a contractor was constructing a new heavy equipment shed for ADOT&PF. The caller also reported that there was heavily stained soil at the site of the recently demolished old equipment shed about 300 yards away. ADOT&PF staff reported that they were aware of contamination in the old shed and had planned to have it assessed before the shed was demolished, but the contractor had taken the shed down prematurely. ADOT&PF staff conducted an inspection of the new building on August 12, 2009, and reported no spills at the contractor's fueling site. Photos of the old shed site taken during this visit show areas of stained soil. A site characterization was completed on May 26, 2010. The report, dated July 13, 2010, documents DRO levels up to 10,220 mg/kg and RRO levels up to 35,100 mg/kg at 3 sampling locations on the old shed pad. GRO and BTEX results from the same locations were below ADEC migration-to-groundwater cleanup levels. Contaminated Sites staff performed a site visit in June of 2015. Two soil samples were collected from two stained areas at this site. Sample SS2 was collected from 24-inches below ground surface (BGS), and from a silt layer below stained gravel. Sample SS8 was collected from 18-inches bgs from a stained gravel material, and above the silt layer. Ground surface was visually stained in various areas. The tarp, which had previously covered the stained areas, was almost completely deteriorated. Analytical results showed elevated levels of DRO and RRO up to 4,290 mg/kg and 13,400 mg/kg, respectively, in Sample SS8. Results from Samples SS2 showed DRO and RRO at 42.8 mg/kg and 581 mg/kg, respectively; both of which are below ADEC cleanup levels. Estimated remaining contamination is 90 cubic yards in the surface soil; contamination is not expected in the sub-surface soils.

Action Information

Action Date Action Description DEC Staff
9/29/2010 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PERP staff Neil Huddleston. Spill no. 09269921801; spill date = 8/6/09; substance = unknown (petroleum); quantity = unknown. Mitzi Read
10/4/2010 Site Added to Database A new site has been added to the database Mitzi Read
10/5/2010 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 78961 name: ADOT&PF Ekwok Airport Former Equipment Bldg Mitzi Read
10/11/2010 Report or Workplan Review - Other Reviewed Soil Stain Sampling Report prepared by URS for ADOT&PF, dated July 13, 2010 for field work completed on May 26, 2010. GRO up to 92.9 mg/kg; DRO up to 10,200 mg/kg; RRO up to 35,100 mg/kg; BTEX either not detected or well below the most stringent migration to groundwater cleanup levels. Former equipment building area is approximately 500 feet from the school and 900 feet from the Nushagak River (map in report says Kashugak River). Need to do more characterization to determine the vertical extent of contamination; the samples were hand-dug and only up to 14 inches deep. A well search is needed and water samples from the school and groundwater would help determine next steps. Pam Clemens
2/16/2012 Update or Other Action Staff changed from Pam Clemens to Linda Nuechterlein. Kristin Brown
3/23/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78961 ADOT&PF Ekwok Airport Former Equipment Bldg. Bill O'Connell
2/26/2014 Update or Other Action DOT indicated that if a project is scheduled for the airport in the future, further clean up will be performed. Joshua Barsis
8/8/2014 Update or Other Action The Alaska Department of Environmental Conservation (ADEC) division of Environmental Health (EH) Solid Waste Program (SWP) performed a site visit on June 4, 2014. A tarp was present covering the area, however, was torn and ripped in most places. One larger stain and several smaller stained areas were visible during the site inspection. Joshua Barsis
6/3/2015 Site Visit Two soil samples were collected from two stained areas at this site. Sample SS2 was collected from 24-inches below ground surface (BGS), and from a silt layer below stained gravel. Sample SS8 was collected from 18-inches bgs from a stained gravel material, and above the silt layer. Ground surface was visually stained in various areas. The tarp, which had previously covered the stained areas, was almost completely deteriorated. Analytical results showed elevated levels of DRO and RRO up to 4,290 mg/kg and 13,400 mg/kg, respectively, in Sample SS8. Results from Samples SS2 showed DRO and RRO at 42.8 mg/kg and 581 mg/kg, respectively; both of which are below ADEC cleanup levels. Estimated remaining contamination is 90 cubic yards in the surface soil; contamination is not expected in the sub-surface soils. Joshua Barsis
6/16/2015 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78961 ADOT&PF Ekwok Airport Former Equipment Bldg. Joshua Barsis
5/4/2016 Update or Other Action Sent a letter to DOT on this date detailing the site's history and current data gaps which need to be addressed before the site can be considered for closure. Nathan Maxwell
5/2/2017 Update or Other Action Letter sent to ADOT&PF detailing the history of this site and requesting a work plan for further characterization and cleanup once funding for this project is secured. Received an email response from Jennifer Micolichek, ADOT&PF environmental analyst who is handling cleanup at this site, saying that they will give ADEC an update after July 1, 2017, when the budget is allocated. Sammi Castle

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

There are no documents for this site report.

Missing Location Data

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