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Site Report: Beaver Creek Pad 4

Site Name: Beaver Creek Pad 4
Address: Marathon Road, Kenai, AK 99611
File Number: 2320.38.007
Hazard ID: 1005
Status: Active
Staff: Peter Campbell, 9072623412
Latitude: 60.655328
Longitude: -151.033310
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.


A diesel spill was encountered at the generator building in September 1990. The diesel spill originated from a fitting in a line that ran from a diesel tank to the generator building. Marathon was given approval for excavation of the contaminated soils in September 1990. Marathon started excavating the site and discovered the spill to be more extensive than originally thought. The contamination on the ground surface was only three feet in diameter. Upon excavation, the contamination went down to groundwater in a narrow path and then extended in all directions on the groundwater surface. The diesel spill extended under the generator building and under the road. In the other direction the plume extended over 100 feet. The reason for the small diameter surface contamination, narrow path to the water table and the extended plume is the soil consists of highly permeable sands and gravels with very little silt to absorb the diesel. In November 1990, Marathon contracted James M. Montgomery Engineering to further assess the site to determine the extent of contamination. In July 1991, Marathon submitted a work plan for excavation and stockpiling contaminated soils at the incinerator site on pad #7. The plans also provide for the installation of four monitoring wells to help determine the direction of groundwater flow and the extent of diesel plume. The department approved Marathon's plan, and Marathon excavated and incinerated almost 1,000 cubic yards of diesel contaminated soils by October 1991. Excavation of contaminated soils were stopped due to undermining the generator building foundation. In addition, Marathon could not excavate contaminated soils from beneath the road because of logistics involved with the road. The road is bounded on one side by oil field gas and oil piping and on the other by a bluff. The diesel plume extended under the road and the piping which transfers product from the gas and oil fields. In January 1992, Marathon submitted a site assessment and remediation plan to the department. The plans were reviewed by the department and a meeting was held with Marathon, U.S. Fish and Wildlife and ADEC in January 1992 to discuss the results of the site assessment and remediation plans. Further site assessment was required to determine the extent of contamination. Marathon agreed to conduct further site assessment in the 1992 field season and would get the plans to ADEC by April 1992. Marathon excavated and incinerated all the diesel contaminated soils that did not undermine the integrity of the generator building, access road, and the gas and oil piping. Further site assessment and in situ remediation options for the site are being investigated by Marathon.

Action Information

Action Date Action Description DEC Staff
8/9/1993 Site Ranked Using the AHRM Initial ranking. No Longer Assigned
8/10/1993 Site Added to Database Diesel. No Longer Assigned
4/1/1994 Preliminary Assessment Approved (Old R:Base Action Code = SA2R - Phase II SA Review (CS)). ADEC reviewed site assessment results. No Longer Assigned
5/10/1994 Update or Other Action (Old R:Base Action Code = SA1R - Phase I SA Review (CS/LUST)). Reviewed monitor well results and requested additional monitor wells to further delineate the perimeter of the spill. No Longer Assigned
8/9/1994 Site Characterization Report Approved (Old R:Base Action Code = SA1R - Phase I SA Review (CS/LUST)). Approved phase 1 site assessment report. No Longer Assigned
8/9/1994 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Approved monitor well decommissioning work plan for wells on this site. No Longer Assigned
1/23/1998 Cleanup Plan Approved (Old R:Base Action Code = CAPA - Corrective Action Plan). Staff approved a work plan to properly decommission a damaged monitor well and replace it with a new one in the same vicinity. Bob Krogseng
8/12/1999 Update or Other Action PM changed to Seagren. Donald Seagren
9/24/1999 Meeting or Teleconference Held Met with Marathon and USFWS staff to discuss the status of "open" spills and how to proceed to closure. Site walk through. Discussed clean closure of permitted landfill in 2000. Referred this to SW program in Anchorage. Donald Seagren
9/28/1999 Update or Other Action 3 MWs transferred to this site from Reckey 1988230135702. Donald Seagren
9/29/1999 Update or Other Action Requested information on monitor well status and corrective actions prior to responding to request for monitoring program changes. Donald Seagren
10/26/1999 Update or Other Action Reviewed and approved groundwater monitoring plan with modifications. Discussed plan with USWS and Marathon staff prior to issuing approval and changes. Donald Seagren
2/14/2000 Update or Other Action Reviewed Monitoring Well Abandonment, Installation and Annual Ground Water Monitoring Report. Donald Seagren
5/5/2000 Meeting or Teleconference Held Meeting and site inspection with Marathon, Oasis and USFWS. Proposed plan was discussed. Based on USFWS concerns and refuge regulations, the plan will be revised to follow Method 2 cleanup levels for both soil and GW. Donald Seagren
5/8/2000 Update or Other Action Sent letter to Marathon and USFWS as follow-up to meeting on 5/5/00 negating proposed plan and requesting revised plan following Method 2 guidelines. Donald Seagren
9/20/2000 Site Characterization Workplan Approved Work plan for Site investigation, Groundwater Monitoring and Well Abandonment reviewed, discussed with USFWS and approval letter issued. Marathon informed and requested notification when work will be done for site inspection. Donald Seagren
10/12/2000 Update or Other Action Site inspection with Jim Frates, USFWS, to observe additional site assessment activities Donald Seagren
1/29/2001 Update or Other Action Reviewed Annual GW Monitoring Report, Additional Assessment and Well Abandonment report. Donald Seagren
7/27/2001 Meeting or Teleconference Held Reviewed file and latest report. Meeting at the field at the request of Marathon during media tour. Donald Seagren
1/18/2002 Update or Other Action Reviewed monitoring report. Donald Seagren
1/22/2002 Update or Other Action Discussed monitoring report with Eric Ward of Marathon. Requested further definition and possible free product recovery in AP29. Also discussed DRO and propylene glycol levels in AP3. Last well before it hits Beaver Creek. Also discussed with Claire Caldes , USFWS. A meeting will be set up on site during next sampling event. Donald Seagren
1/5/2004 Update or Other Action Received and reviewed November 2002 Annual Monitoring report. Donald Seagren
1/23/2004 Meeting or Teleconference Held Met with Eric Ward (Marathon) and Claire Caldes (USFWS). MW AP-3 will review site to try to determine source and continue monitoring. PW-1-89 may need to be abandon to allow for drill ring on site. Will be sampled twice more prior to decision. Donald Seagren
1/23/2004 Update or Other Action Reviewed 2003 MW Sampling Report. Follow up actions per discussion in meeting today. Donald Seagren
1/27/2004 Update or Other Action File Number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
4/12/2004 Update or Other Action In consultation with USFWS/KNWR and BLM approved abandonment of 2 MWs to make way for drill rig on Pad 4 this summer. Donald Seagren
5/14/2004 Update or Other Action Received MW abandonment report. Coordinated gravel removal and relocation in field with USFWS. Donald Seagren
6/7/2004 Update or Other Action In consultation with USFWS, approved Marathon's plan for re-use &/or disposal of gravels from Pad 4 and Pad 1A. Donald Seagren
2/25/2005 Update or Other Action Reviewed Pad 12A 30 November 04 Produced Fluid Release report Will coordinate with PERP on transfer of site to CS for long term remediation.. Donald Seagren
4/13/2005 Update or Other Action Approved work plan for assessment during construction of new electrical shop. discussed the work with Pete Campbell - American Environmental. Donald Seagren
4/21/2005 Update or Other Action Inter agency site inspection to review work on Pad 1A spill, new electric shop assessment and 2004 GW monitoring report. Donald Seagren
7/29/2005 GIS Position Updated Using Figure 2 from a Work Plan Diesel Spill Cleanup Beaver Creek Production Facility, from Woodward-Clyde, dated July 1991, 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
10/20/2005 Update or Other Action Reviewed 2004 annual monitoring report. some fluctuations in DRO contaminant levels exceeding cleanup levels. However, it appears as if conditions are fairly stable. Need to continue monitoring and develop corrective actions if contaminant trends continue to appear to be increasing. May be due to migration of contaminants or a separate release. Donald Seagren
7/10/2006 Update or Other Action Reviewed monitoring report dated July 06 for the August 05 monitoirng event. Separate phase hydrocarbons found in AP15 & AP29. Petro Pore devices in AP15 & AP29 with approximately 8 gallons of product recovered since inception. No appreciable change in the contaminant plume or risk tohuman health or the environment. An internal Marathon review of the project will happen later in 06. A remediation plan will be developed and submitted following the review. Donald Seagren
1/2/2007 Update or Other Action Reviewed 06 Montioring Well Sampling report. 15 MWs wer gauged to measure the depth to GW and thickness oa any separate phase product. GW samples were collected from 12 of the MWs and analyzed for DRO & BTEX. 1 MW was also sampled for RRO, GRO and glycols. Separate phase product was present in AP15. Passive recovery devices ar present in 2 MWs. AP-29 historically has had separate phase product present and therefore was not sampled. AP3 exceeded the cleanup level for DRO. AP10 exceeded the cleanup level to benzene. DRO levels decreased in 4 wells and increased in 2 wells. 7 wells had no detectable DRO. Passive hydrocarbon recovery will continue as well as annual monitroing. further delineation around the compressor building will be explored. No appreciable change in results or the risk to human health or the environment. Donald Seagren
4/5/2007 Exposure Tracking Model Ranking Donald Seagren
7/20/2007 Site Characterization Workplan Approved Approved Beaver Creek Pad 4 Site Assessment & Remedial Evaluation Work Plan dated 19 July 07. Donald Seagren
5/7/2008 Site Characterization Report Approved Reviewed 07 monitoring/assessment report. No significant changes to the risk to human health or the environment. The DRO contaminant plume is stable and not expanding. The GW flow from the glycol spill area appears to be flowing toward the DRO release site, not toward Beaver Creek. further assessment and refinement of the data will be accomplished at the DRO release site during 08. Further delineation of the extent of the glycol spill area will be accomplished during 08. Monitoring and passive product recovery will continue in 08. Donald Seagren
6/11/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath, per Linda Nuechterlein. Alyce Hughey
11/24/2008 Update or Other Action Site transferred from Paul Horwath to Don Fritz, per Paul Horwath. Alyce Hughey
12/14/2009 Update or Other Action Review 2007/08 Oasis Annual Groundwater Monitoring report. Don Fritz
7/28/2010 Report or Workplan Review - Other Send response letter to the October 2009 Groundwater report from Oasis. Don Fritz
8/11/2010 Site Visit Site visit to meet with Doug Kinnett and view the layout of Pad 4. Don Fritz
11/16/2011 Update or Other Action Site transferred from Don Fritz to Peter Campbell per Paul Horwath. Alyce Hughey
6/13/2012 Report or Workplan Review - Other Reviewed the Beaver Creek Production Facility - Pad 4, 2011 Annual Groundwater Monitoring Report, dated April 11, 2012, prepared by OASIS Environmental. During the 2011 groundwater sampling event, only four of the twelve sampled wells detected DRO below the groundwater cleanup levels. All other monitoring wells did not detect DRO. Product recovery has been conducted in two monitoring wells (AP-15 and AP-29) since 2002 and 2003. The cumulative total of gallons recovered from the two monitoring wells is 12.25-gallons. Monitoring well AP-15 has recovered a total of 7.89-gallons since 2003, and well AP-29 has recovered a total of 4.36-gallons since 2002. No product was recovered from the wells in 2011, and both the Petropore Passive Skimmers were pulled in November of 2011. Monitoring wells AP-25 and AP-26 were monitored for Natural Attenuation Parameters, with DRO results in AP-25 indicating a declining trend, and the DRO results in AP-26 indicating a low variability with no trend. The resurvey of all monitoring wells was postponed due to heavy snow fall. Alyce Hughey
9/18/2014 Report or Workplan Review - Other Reviewed the Beaver Creek Production Facility - Pad 4, 2012 Annual Groundwater Monitoring Report, dated July 2014, prepared by SLR Alaska. During the 2013 groundwater sampling event, two of the ten sampled wells detected DRO below the groundwater cleanup levels. Two additional wells have separate phase product present. Peter Campbell
9/25/2014 Update or Other Action Letter to Hilcorp requesting additional groundwater investigation in the area of Monitoring Well AP-3 in the area of the flare pit. Require monitoring well maintenance. Peter Campbell
10/24/2014 Update or Other Action Letter from Hilcorp acknowledging request for additional investigation, but requesting an extension for the work plan until the 2015 field season. Extension granted. Peter Campbell
9/24/2015 Meeting or Teleconference Held Meeting held with Hilcorp and their consultant to discuss product recovery and well sampling frequency. Hilcorp proposes to continue removing product from wells AP-10 and AP-25. Continue sampling wells AP-3, AP-4, AP-14, AP-28, AP-30, AP-31, AP-33 and AP-34 at four year intervals. Wells AP-23, AP-24, AP-26, AP-27, and AP-32 would only be gauged. ADEC has also requested that the flare pit be investigated as a source area. Peter Campbell
9/23/2016 Site Visit Site visit with Spill Response to observe the installation of a monitoring well near the location of a pipeline release near the oil loading facility. The Spill Response program is leading the investigation into this newly discovered release. Several boings and wells are being installed, along with four new monitoring wells at the flare pit. Peter Campbell
10/11/2016 Site Visit Site visit with Spill Response Program to observe the excavation of impacted soils fro a crude pipeline release near the bulk loading facility on Pad 4. The excavation was open with obviously stained soils present. It appears that infrastructure (above ground pipe line and loading dock) is going to prevent the removal of all of the impacted soils. Soil removal is ongoing. Peter Campbell
8/22/2017 Report or Workplan Review - Other Review letter from Brice Environmental titled Beaver Creek Flare Pit Monitoring Well Reconnaissance (August 16, 2017). Reviewed document and approve the tentative locations of four monitoring well around the flare pit. Peter Campbell
9/18/2017 Report or Workplan Review - Other BCP4 (South) groundwater wells are monitored on a biennial and a four-year schedule. All viable wells are gauged during each sampling event. 2017 field activities will include: Sample two wells for DRO and PAH: AP-10R and AP-25. (Well AP-10 was replaced in September 2016 with flush-mount well AP-10R.) Eight wells are sampled for DRO and PAH at a frequency of every four years and will be sampled next in 2019: AP-3, AP-4, AP-14, AP-28, AP-30, AP-31, AP-33, and AP-34. Groundwater levels will be gauged in these wells in 2017. AP-3 and AP-33 ethylene glycol is no longer considered a contaminant of concern. Remove LNAPL from AP-15 and AP-29. If LNAPL is not present, the well(s) will be tested for DRO, PAH (8270D) and 8260C. If PAH’s are not detected in wells, this sampling may be discontinued. See 2017 Kenai Groundwater Monitoring Program Work Plan. BCP4 (North) groundwater wells are monitored on an annual schedule. All viable wells are gauged during each sampling event. 2017 field activities include: Sample five wells for GRO, PAH, DRO, RRO, and BTEX: AP-4, AP-35, AP-36, AP-38, and AP-39. Gauge groundwater levels in all monitoring wells within a 24-hour period in order to determine groundwater elevation and flow direction. Survey new monitoring wells AP-35, AP-36, AP-38, and AP-39 to establish well coordinates and top-of-casing elevations. Peter Campbell
9/27/2018 Report or Workplan Review - Other The northern wells were sampled during the 2017 sampling. The wells were below ADEC cleanup levels. DEC will require annual sampling for five additional years. Well AP-29 was damaged and we will require a work plan for abandonment of the well. We required a work plan for four new monitoring wells around the flare pit. Peter Campbell

Contaminant Information

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