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Site Report: Beaver Creek Tesoro Lact Unit

Site Name: Beaver Creek Tesoro Lact Unit
Address: 48775 Kenai Spur Highway, Rigtender's Dock Road, Nikiski, AK 99635
File Number: 2323.38.005
Hazard ID: 1510
Status: Active
Staff: Peter Campbell, 9072623412
Latitude: 60.690000
Longitude: -151.387222
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.


Crude oil contaminated soils and groundwater encountered at the Marathon LACT building while assessing the Bernice Creek Spill.

Action Information

Action Date Action Description DEC Staff
12/13/1995 Site Added to Database Site added to database. Don Fritz
12/13/1995 Site Ranked Using the AHRM Site ranked. Score = 43. Don Fritz
1/28/2004 Update or Other Action File number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
7/29/2005 GIS Position Updated Using Figure 1 from Site Assessment Workplan for Marathon Oil Company, Nikiski Lact Unit, from EMCON Alaska, Inc., dated May 1996, in conjunction with TopoZone Pro, and the KPB Parcel Lookup, entered the coordinates for this site. Metadata included No Topo Basemap, TopoZone Pro Street Maps, 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
3/26/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Don Fritz
11/3/2011 Update or Other Action Groundwater monitoring has been conducted at this site. The last groundwater monitoring report received in our office was the November 20, 1998 Groundwater Monitoring Report, Fourth Quarter 1998. This site is under the Contaminated Soil Management Plan for Marathon Oil Corporation, report dated March 16, 2007 and updated January 31, 2008, with remaining soil contamination being taken care of at facility closure. On-going groundwater has been performed in the area in connection with the Tesoro KPL Facility - 1999 release. Alyce Hughey
11/16/2011 Update or Other Action Site transferred from Don Fritz to Peter Campbell per Paul Horwath. Alyce Hughey
5/27/2014 Report or Workplan Review - Other Reviewed the 2013 Groundwater Monitoring Report, dated May 5, 2014, prepared by Kent & Sullivan. The first groundwater monitoring event was performed on January 15, 2013 from two drinking water wells RT-4 and RT-5. The second groundwater monitoring event was conducted on July 16th through the 17th that included sampling and analyzing 30 groundwater wells. Groundwater was flowing with a southwesterly flow direction, which is consistent with previous events. The monitoring wells were gauged on July 12, 2013, and no light non-aqueous phase liquid was detected in the wells. The depth to groundwater ranged from 4.41 to 77.12 feet. The groundwater level across the Kenai Pipeline facility was higher in July than at any other time since 1996. The groundwater levels increased as much as 14 feet between July 2012 and July 2013. The increase in groundwater levels are due to an above-average snow pack in 2012 and major rain storms in the fall of 212 and spring of 2013. The Pipeline Manifold Plume Area groundwater levels rose 5.5 to 10 feet from 2012 to 2013. With the increase in groundwater levels some of the well screens may have been submerged. Wells MW-27, MW-88, MW-5, and MW-60 were non-detect, with some of these wells historically containing detectable concentrations. Tesoro plans to continue to monitor these wells to assess the Pipeline Manifold Plume Area. The Bernice Creek Plume Area monitoring well TMW-2, located near the up-gradient plume continues to increase in benzene concentrations with 0.5 mg/L. It is thought that the increase is due to high groundwater levels and high flow rate of the Bernice Creek impacting the up-gradient plume extent. The monitoring wells down-gradient of the air sparge system (TMW-12, TMW-13, and TMW-14) did not detect benzene in 2013. In addition the two drinking water wells (RT-4 and RT-5) had no detections. The groundwater rose as much as 14 feet in the Bernice Creek Plume Area. The Pond 2 Area shallow well concentrations remain stable with a slight decrease seen. The Beach/Dock Plume Area monitoring wells MW-9, MW-29 and MW-21S remained stable. Monitoring well MW-97 detected benzene for the first time at 0.00198 mg/L. Tesoro plans to continue to monitoring MW-97 during future monitoring events to see if the plume has/is migrating. The Bernice Creek air sparge system was operating continuously other than at times of routine maintenance. Several broken or disconnected air lines were repaired in June resulting in improved airflow. The south lobe of the air sparge system remained off in 2013. Alyce Hughey
10/16/2015 Report or Workplan Review - Other Review of historical file. Monitoring is being conducted under KPL Pipeline. Peter Campbell

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details


Description Details

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