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Site Report: ADOT&PF Bethel Maintenance Facility


Site Name: ADOT&PF Bethel Maintenance Facility
Address: Chief Eddie Hoffman Highway, Bethel Airport, Bethel, AK 99559
File Number: 2400.26.001
Hazard ID: 24665
Status: Cleanup Complete
Staff: ,
Latitude: 60.784239
Longitude: -161.840932
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

In October 1997 one diesel and one gasoline underground storage tanks were removed. Approximately 43 cubic yards of soil was excavated and stockpiled on site. The final limits of the excavation were 16 feet by 15 feet by 7 feet deep. Five confirmation soil samples were collected from the bottom and sides of the excavation, with maximum concentrations of 14,000 mg/Kg for DRO, 1,800 mg/Kg for GRO, 0.15 mg/Kg for benzene, and 94.2 mg/Kg for total BTEX. The highest contaminant concentrations were located at the southeast end of the excavation area, where the pump island was located. Following the removal of the underground storage tanks, the excavation was lined with a 10-mil plastic liner and backfilled with clean material. The area was later repaved with asphalt.

Action Information

Action Date Action Description DEC Staff
2/11/1998 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 78071 * Not Assigned
2/11/1998 Site Added to Database * Not Assigned
3/25/1998 Leaking Underground Storage Tank Cleanup Initiated - Petroleum * Not Assigned
6/14/2004 Update or Other Action File number assigned and entered into the Fileroom DB and LUS DB. Alyce Hughey
10/9/2006 Update or Other Action Project manager changed from Monica English to Don Seagren, per Paul Horwath. Alyce Hughey
6/9/2008 Exposure Tracking Model Ranking Intitial Ranking Complete for Source Area: 78071 (Autogenerated Action)
9/14/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78071 ADOT&PF Bethel Maintenance Facility. Don Fritz
12/28/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78071 ADOT&PF Bethel Maintenance Facility. Don Fritz
1/21/2011 Cleanup Complete Determination Issued In May of 2006, in an effort to characterize the nature and extent of remaining soil contamination, ADEC contracted with a term contractor to install additional soil borings at the facility. Seven soil borings were drilled within and around the 1997 UST excavation. Soil borings extended to a depth of 42 feet below ground surface. Analytical samples were collected from these borings and were analyzed for: BTEX; GRO; and DRO. The analytical samples contained maximum concentrations of 1.34 mg/kg benzene, 452 mg/kg GRO, and 604 mg/kg DRO. Toluene, ethylbenzene, and xylenes were encountered at concentrations below regulatory cleanup levels. Based on the information provided to date, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment, and this site will be closed. ADEC Decision The cleanup actions and natural attenuation to date have served to reduce residual soil and groundwater contaminant concentrations to acceptable levels. Contamination may remain on site in surface or subsurface soil above an established default soil cleanup level; however ADEC has determined there is no unacceptable risk to human health or the environment. Therefore this site is being issued a Corrective Action Complete determination. Although a Corrective Action Complete determination has been granted, ADEC approval is still required for off-site soil disposal in accordance with 18 AAC 78.600(h). It should be noted that movement or use of potentially contaminated soil in a manner that results in a violation of 18 AAC 70 water quality standards is unlawful. Don Fritz
1/21/2011 Institutional Control Record Established Institutional Controls established and entered into the database. Don Fritz

Contaminant Information

Name Level Description Media Comments
BTEX Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation SoilSoilSoil

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

Missing Location Data

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