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Site Report: ADOT&PF Cold Bay Airport Maintenance Facility AST


Site Name: ADOT&PF Cold Bay Airport Maintenance Facility AST
Address: Cold Bay Airport, Cold Bay, AK 99571
File Number: 2538.38.022
Hazard ID: 26185
Status: Active
Staff: Joshua Barsis, 9072697691 joshua.barsis@alaska.gov
Latitude: 55.206017
Longitude: -162.718818
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 November 7, 2011, an above ground storage tank (AST) located on the south side of the ADOT&PF Cold Bay airport maintenance building released at least 50 gallons of heating oil because of a malfunctioning float valve. On November 15, 2011, ADOT&PF personnel began excavating the contaminated soils. Approximately 20 cubic yards of contaminated material were excavated and later, land farmed northeast of the airport. It was determined during the course of the excavation that the extent of contamination was greater than anticipated and the excavation was filled with clean fill. DRO remains above DEC cleanup levels. During excavation activities, an underground storage tank (UST) was discovered just northeast of the AST. The ADOT&PF was unaware of the UST and its purpose; although, it was anticipated that UST was utilized as an oil/water separator. It was subsequently determined that the UST would be regulated under the UST program and is registered as a 1,000-gallon used oil tank (Tank ID #1). See Hazard ID 26184 for information regarding the release from UST #1 at this location.

Action Information

Action Date Action Description DEC Staff
1/23/2014 Site Added to Database A new site has been added to the database Mitzi Read
1/24/2014 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79587 name: Heating Oil AST Joshua Barsis
1/27/2014 Report or Workplan Review - Other A Corrective Action/UST Characterization Report, dated September 2012, documented additional excavation activities at this site. Field activities commenced from June 11 through 14, 2012. Because of buried utilities, the excavation was subdivided into three separate excavations; A, B, and C. The UST (Hazard ID: 26184) was removed from Excavation B. The tank was supplied by a 2.5-inch diameter, steel pipe that extended from the maintenance shop floor drain to the UST. Holes were discovered in the bottom of the UST, indicating that the UST was utilized to facilitate the drainage of fluids into the subsurface soils and retain solids in the tank (similar to a septic crib). Five confirmation soil samples were collected during the course of the UST removal and were analyzed for gasoline range organics (GRO); diesel range organics (DRO); residual range organics (RRO); benzene, toluene, ethylbenzene, and xylenes (BTEX); resource conservation and recovery act (RCRA) metals; volatile organic compounds (VOCs); and polychlorinated biphenyls (PCBs). The 2.5-inch supply pipe was capped with concrete and a “biovent piping arrangement” was placed at the base of the UST excavation prior to backfilling with clean fill. The combined size of all excavations (A, B, and C) was approximately 1015 square feet (ft2). A total of 22 confirmation soil samples, including 2 duplicate soil samples, were collected from Excavations A, B, and C (not including the soil samples collected during the UST removal). These soil samples were analyzed for GRO, DRO, RRO, BTEX, and polynuclear aromatic hydrocarbons (PAHs). DRO contaminated soil remains above the approved cleanup level in all three excavation locations, at concentrations ranging from 275 mg/kg to 3,230 mg/kg. In the UST removal location, concentrations of GRO at 800 mg/kg and 1,2,3-trichloropropane at 0.171 mg/kg remain at the base of the excavation. Contaminant concentrations likely remain beneath the airport maintenance building at similar concentrations. All excavated soils were segregated based on contaminant source (AST or UST) and stockpiled separately in lined, land farm storage cells. Joshua Barsis
2/3/2014 Report or Workplan Review - Other On this day DEC received a Land Farm Testing Report, dated October 9, 2013. The report documented two land farms (AST and UST) produced from the 2012 excavation at this site. The AST land farm was approximately 10,000 square feet in size. Thirty six soil samples were field screened from the AST land farm and, based on field screening results, ten confirmation soil samples, including a duplicate soil sample, were submitted for laboratory analysis. The UST land farm was approximately 900 square feet in size. Two confirmation soil samples were collected from the UST land farm and submitted for laboratory analysis. All twelve of the soil samples were analyzed for GRO, DRO, RRO, and BTEX. Concentrations of DRO were detected at a maximum concentration of 850 mg/kg in samples collected from the AST land farm; which exceeds the ADEC cleanup criterion of 250 mg/kg for DRO. None of the samples collected from the UST land farm exhibited contaminant concentrations that exceeded the ADEC cleanup criteria; however, based on previous investigations in 2012, the UST land farm is destined for offsite disposal at a later date. Joshua Barsis
4/3/2014 Update or Other Action On this day, the DEC received correspondence from the DOT indicating that there are no drinking water wells located within 1,500 feet of the site. The letter indicated that all water is obtained from the water treatment plant located approximately 1,665 feet from the site. This information was reportedly provided by Jorge Lopez, the Mayor of Cold Bay. This site should be evaluated for closure after the soil stockpile generated during excavation is remediated or treated. Joshua Barsis
10/3/2017 Report or Workplan Review - Other Reviewed the Land Farm Testing Report, dated September 2017 for this site. Completed activities consisted of collected soil samples from the land farm. DRO contamination is still present up to 1,120 mg/kg. Further tilling and monitoring was recommended. Joshua Barsis

Contaminant Information

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