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Site Report: Beluga River 232-4

Site Name: Beluga River 232-4
Address: NW side of Cook Inlet, Beluga River Gas Field, Tyonek, AK 99682
File Number: 2337.38.023
Hazard ID: 999
Status: Cleanup Complete
Staff: ,
Latitude: 61.161111
Longitude: -151.057500
Horizontal Datum:NAD83

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.


Hydrocarbon contaminated soil at former contractor sump. Analytical results indicate that extractable petroleum hydrocarbon (EPH) constituents have migrated 50 feet southeast from the former contractor sump location. EPH concentrations above 1,500 milligrams per kilogram (mg/kg) were obtained at depths ranging from 2.5 to 11 feet below grade. It appears that some vertical "smearing" has occurred at borings 232-4B and 232-4K, where elevated EPH concentrations (1,500 to 4,200 mg/kg) are present above and below the water table. The "smearing" effect was most likely caused by water table fluctuations.

Action Information

Action Date Action Description DEC Staff
4/23/1992 Site Added to Database No Longer Assigned
1/4/1993 Site Ranked Using the AHRM Surface Water Exposure Index Value changed from site managers form. No Longer Assigned
9/25/2000 Site Characterization Workplan Approved Site characterization work plan in support of method 3 closure approved Don Fritz
5/21/2004 Update or Other Action File number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
7/26/2005 GIS Position Updated Using Figure 1 from a Site Characterization Report, 10 Sites at Beluga River Field, from OilRisk Consultants, in conjunction with TopoZone Pro, entered the coordinates for this site. Metadata include No Topo Basemap, TopoZone Pro Street Map, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
2/6/2006 Update or Other Action File name changed from ARCO BRU 232-4 Contractor Sump to Beluga River 232-4 on 2-6-06 per Don Fritz. Alyce Hughey
6/18/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Don Fritz
11/16/2011 Update or Other Action Site transferred from Don Fritz to Peter Campbell per Paul Horwath. Alyce Hughey
11/18/2014 Report or Workplan Review - Other Review 2012 Drill Site 232-04 (B Pad) site characterization Report, Beluga Alaska. One monitoring well and one micro well were sampled on November 6, 2012. The wells were sampled for DRO, GRO and BTEX. Well 232-4-1 had no detectable concentrations in the water sample. Well 232-4-3 had an estimated 1.1 mg/L DRO, and trace levels of toluene, ethyl benzene and xylene. Conoco Phillips has made a request that ADEC consider closing this site. We are evaluating the results and will review the historical file. Peter Campbell
4/10/2015 Long Term Monitoring Complete Monitoring wells removed. Peter Campbell
12/18/2015 Cleanup Complete Determination Issued ADEC has determined that the residual contamination doesn’t pose an unacceptable risk to human health or the environment. We are issuing this Cleanup Complete determination, subject to the following standard conditions: Any proposal to transport soil or groundwater off-site requires ADEC approval in accordance with 18 AAC 75.325. A “site” [as defined by 18 AAC 75.990 (115)] means an area that is contaminated, including areas contaminated by the migration of hazardous substances from a source area, regardless of property ownership. Movement or use of contaminated material in a manner that results in a violation of 18 AAC 70 water quality standards is prohibited. Peter Campbell

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Soils were impacted at levels above migration to groundwater. Groundwater impacts were not detected in monitoring wells.

Control Type

Type Details
No ICs Required


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

Missing Location Data

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