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Site Report: ADOT&PF Cold Bay Airport Maintenance Facility UST #1


Site Name: ADOT&PF Cold Bay Airport Maintenance Facility UST #1
Address: Cold Bay Airport, Cold Bay, AK 99571
File Number: 2538.26.004
Hazard ID: 26184
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@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 15, 2011, ADOT&PF personnel began excavating contaminated soil from a November 7, 2011 release of heating oil from an above ground storage tank (AST) located on the south side of the ADOT&PF Cold Bay airport maintenance building. 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. 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. 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). 1,2,3-Trichloropropane, GRO, and DRO remain above DEC cleanup levels. See Hazard ID 26185 for information regarding the release from the AST at this location.

Action Information

Action Date Action Description DEC Staff
9/1/2012 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 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
1/7/2013 Update or Other Action On this day, the DEC received a Conditional Approval of Permanent Closure of One Motor Vehicle Waste Disposal Well (the UST removed in 2012) for this site from the U.S. Environmental Protection Agency (EPA). Pursuant to the EPAs authority under 40 CFR 144.89(a)(1), the motor vehicle waste disposal well was permanently closed with the following conditions: 1) Because the levels of DRO, GRO, arsenic, and TCP were detected above ADEC cleanup criteria in the confirmation samples, ADOT&PF must continue to work with the ADEC to address the remaining contamination. 2) EPA normally requires that confirmation samples be analyzed for SVOCs by EPA 8270; however, because the samples were analyzed for DRO and RRO, and because the waste disposal well was originally thought to be a UST, the EPA will accept the more limited 8270 SIM parameters for this well closure. 3) ADOT&PF should evaluate the potential impacts to groundwater and the nature and extent of groundwater contamination (if any). 4) The contaminated stockpiles must be disposed of or treated in a manner appropriate with the contaminant concentrations. Joshua Barsis
1/23/2014 Site Added to Database A new site has been added to the database Mitzi Read
1/23/2014 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area 1,000-Gallon Used Oil UST #1, 79586 Mitzi Read
1/27/2014 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79586 name: 1,000-Gallon Used Oil UST #1 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
2/3/2014 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Administrative action addition for grant reporting purposes. Evonne Reese
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 disposed of offsite. Joshua Barsis
4/4/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79586 1,000-Gallon Used Oil UST #1. Joshua Barsis
9/4/2014 Update or Other Action On this day, the contaminated sites program (CPS) received a certificate of disposal for the UST soils; a total of 35.04 tons of contaminated soil were disposed of offsite. Joshua Barsis
10/7/2014 Cleanup Complete Determination Issued Corrective Action Complete with ICs entered on this day. Petroleum contamination remains on-site in soil above ADEC cleanup levels; however ADEC has determined there is no unacceptable risk to human health or the environment as long as the contamination is properly managed. See cleanup letter for more information. Joshua Barsis
10/7/2014 Institutional Control Record Established Institutional Controls established and entered into the database. Joshua Barsis
10/7/2014 Update or Other Action Received signed Cleanup Complete-ICs Agreement Page Joshua Barsis
11/1/2016 Institutional Control Compliance Review Staff changed from Joshua Barsis to IC Unit. IC compliance review conducted. Information added to Closure/IC Details. Reminder system set to follow-up in 2019. Kristin Brown

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
1,2,3-Trichloropropane > Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site. Standard condition.
Groundwater Use Restrictions Installation of groundwater wells requires ADEC approval.
New Construction Restrictions
When Contaminated Soil is Accessible, Remediation Should Occur Sub-surface soil contamination is located beneath the shop building. When the building is removed and/or the soil becomes accessible, the soil must be evaluated and contamination addressed in accordance with an ADEC approved work plan.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) Standard condition.
Periodic Review The ADOT&PF shall report to ADEC every five years to document land use, or report as soon as the ADOT&PF becomes aware of any change in land ownership and/or use, if earlier.

Missing Location Data

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