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Site Report: Kenai Gas Field Pad 34-31

Site Name: Kenai Gas Field Pad 34-31
Address: 34110 Bypass Road, 35570 Kalifornsky Bech Rd, Kenai, AK 99611
File Number: 2320.38.031
Hazard ID: 3331
Status: Active
Staff: Peter Campbell, 9072623412 peter.campbell@alaska.gov
Latitude: 60.475278
Longitude: -151.274444
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.

Problems/Comments

A sheen was noticed in the well cellar of the Class II Injection Well WD-1. A site assessment determined that natural gas condensate contamination of the soil and groundwater exceeds ADEC Method II cleanup levels.

Action Information

Action Date Action Description DEC Staff
3/21/2000 Site Characterization Workplan Approved Sampling and Analysis Work Plan approved for Spill 992399322703. This spill is on the same pad and also included site investigation for release 2000230105501. Gary Folley
5/24/2000 Site Ranked Using the AHRM Initial ranking. Donald Seagren
6/19/2000 Site Added to Database Natural gas condensate contamination. Donald Seagren
6/27/2000 Site Characterization Report Approved Report approved and letter sent requesting Phase II site investigation to determine horizontal and vertical extent of contamination and impacts. Also recommended Marathon contact land owner KPB and include them in the decision process. Donald Seagren
8/22/2000 Site Characterization Workplan Approved Phase II site assessment work plan to determine vertical and horizontal extent of contamination reviewed and approved. Donald Seagren
9/11/2000 Update or Other Action Site inspection with Bob Menzie, Marathon, at start of site assessment work Also inspected KGF Pads 33-1 and 33-30 and discussed additional investigations that are needed. Donald Seagren
2/7/2001 Update or Other Action Review Additional Soil and GW Assessment Report. Donald Seagren
5/1/2001 Update or Other Action Review Quarterly Monitoring Report - January 2001; discuss comments with Chick Underwood for future monitoring. Donald Seagren
9/17/2001 Update or Other Action Review quarterly monitoring report - April 2001. Send request to Chick Underwood for table/graph to track contaminant levels in MWs to observe any trends. Of particular concern is the unknown area beyond MW7 and MW8. Depending on any trends, an additional MW may be required in the future. Donald Seagren
1/3/2002 Update or Other Action Discussed change in monitoring from quarterly to semi-annual with Chick Underwood of Marathon. Jointly decided on spring and fall as the sampling times to coincide with periods of higher water levels at the site. Donald Seagren
5/3/2002 Update or Other Action Received a call from Chick Underwood. MWs 4 and 9 have 2"-4" product (gas condensate type) floating in them. Unocal will monitor and evaluate. If product is persistent, they will install passive recovery systems in both wells. Monitoring report and letter work plan to follow. Donald Seagren
8/27/2002 Update or Other Action Reviewed monitoring reports 2001 and 2002. NCG present in 2 MWs. Discussed with Marathon and sent follow-up e-mail requesting free product recovery and installation with additional MWs to better define contaminant plume. Donald Seagren
6/26/2003 Update or Other Action Reviewed September 02 Semi Annual GW Monitoring report. Called Eric Ward to discuss questions in his letter. Donald Seagren
1/23/2004 Meeting or Teleconference Held Met with Eric Ward (Marathon). Continued monitoring. Latest report in progress. Contaminant levels declining. Donald Seagren
3/10/2004 Update or Other Action File number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
5/25/2004 Update or Other Action All analyses in Oct. 03 sampling event below Table C cleanup levels. This may be due to a change in sampling technology. Will review April/May 04 sampling event before responding to change in sampling frequency request. Discussed with Eric Ward of Marathon. Donald Seagren
6/24/2004 Update or Other Action Latest monitoring results show contaminant levels increased. Evaluation of data and report in progress. Donald Seagren
6/27/2005 GIS Position Updated Using Figures 1 through 3 from a Annual Monitoring Report May 2005 Marathon Pad 34-31, from MACTEC Engineering and Consulting, dated June 11, 2005, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinated Datum, NAD83. High degree of confidence in accuracy of location. Alyce Hughey
7/18/2005 Update or Other Action Reviewed May 05 monitoring report. No free product identified in MW 4 or 9; Both wells contained sheens. DRO concentrations increased slightly from the previous monitoring event. However, no appreciable change to the risk to human health or the environment. Next annual monitoring event to be conducted in April/May 06. Donald Seagren
2/7/2007 Update or Other Action Reviewed 06 annual monitoring report. The size of the DRO plume with concentrations exceeding ADEC GW cleanup levels was smaller in 06 than in 05 and all BTEX results continue to be below ADEC GW cleanup criteria. The data indicates that the subsurface petroleum impacts in the GW are naturally attenuating. Annual GW monitoring will continue. Site infrastructure currently prevents any active cleanup/remediation efforts. Donald Seagren
2/7/2007 Exposure Tracking Model Ranking Baseline ETM ranking completed. Donald Seagren
7/17/2007 Site Characterization Workplan Approved Approved the proposed 2007 Site Assessmeent Work plan Donald Seagren
7/20/2007 Site Characterization Workplan Approved approve scheeduling change to the site assessment work plan Donald Seagren
5/8/2008 Site Characterization Report Approved Reviewed Site Assessment and Remedial Evaluation report dated April 08. No significant change to the risk to human health and the environment. Some indications of biological contaminant degredation appears to be occurring. However, due to a lack of useable DO and questionable ORP readings, a proper assessment of Monitored Natural Attenuation is compromised. Further assessment of MNA parameters will occur in 2008. GW monitoring will continue. Remedial alternatives will be researched further in order to develop a remediation plan for the site. Donald Seagren
6/12/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. Alyce Hughey
8/18/2009 Document, Report, or Work plan Review - other Reviewed the 2007/2008 Annual Groundwater Monitoring Report, dated May 8, 2009, from OASIS Environmental for Paul Horwath. Diesel Range Organic groundwater contamination above the groundwater cleanup levels was observed during the one 2007 and the three 2008 monitoring events in the area of the Wastewater Building in on and off pad monitoring wells. The soil gas testing showed the presence of elevated carbon dioxide concentrations above background levels, which suggests that aerobic degradation is occurring and that biodegradation is resulting in an anaerobic environment. Based on the data compiled to date it indicates that the plume concentrations are stable or declining. Alyce Hughey
2/17/2012 Document, Report, or Work plan Review - other Reviewed the Kenai Gas Field Pad 34-31 2010 Annual Groundwater Monitoring Report, dated January 28, 2011, from OASIS Environmental. The contamination impacting the groundwater is a natural gas condensate with the separate-phase plume existing in the area of the wastewater building, on the west side of the pad. A sheen was noted in MW-9, which had been report in prior events. MW-4 had 350 ml (0.09-gallons) of recovered product from the passive skimmer, with a total of 4.304-gallons being recovered since January of 2004. Three on-pad monitoring wells detected DRO above the ADEC groundwater cleanup levels at 1.8 to 1,600 mg/L and within one off-pad monitoring wells at 3.5 mg/L. Monitored Natural Attenuation parameters were evaluated and it was reconfirmed that predominantly active anaerobic attenuation processes are occurring at the site. Alyce Hughey
7/19/2012 Document, Report, or Work plan Review - other Reviewed the 2010 Annual Groundwater Monitoring Report, dated April 11, 2012, prepared by OASIS Environmental. The annual 2010 monitoring event was performed on January 24 and January 25, 2011 due to scheduling conflicts. Twelve monitoring wells (MW-1, MW-2, MW-5 through MW-12, MW-15 and MW-15), were sampled during the January 2011 sampling event. The groundwater flow direction was not calculated during the 2011 sampling event because an elevation survey was not performed on site monitoring wells. The depth to groundwater ranged from 4.05 to 24.63 feet from the well monitoring point. DRO was detected in an off-pad monitoring well MW-7 at 4.4 mg/L and in an on-pad monitoring well MW-10 at 2.6 mg/L. MW-4 was not sampled even though no product was measured in the well. Alyce Hughey
9/17/2012 Document, Report, or Work plan Review - other Peter Campbell conditionally approved the 2012 Groundwater Monitoring and Sampling Work Plan, dated May 11, 2012 with the following recommendations and/or conditions: 1. Wells MW-A, MW-C and MW-E should be evaluated for their soundness and value in the monitoring network. We feel that these monitoring wells could be decommissioned. 2. ADEC agrees that benzene monitoring is no longer warranted and that DRO is the only parameter that requires continued monitoring and laboratory analyses. 3. The work plan states that all wells will be gauged for depth to water. ADEC is requiring that wells MW-1, MW-4, MW-7, MW-8, MW-9, and MW-10 be gauged with a hydrocarbon interface probe to measure for free product thickness. If free product accumulates in any of these groundwater monitoring wells, then product recovery will be required in those wells. Alyce Hughey
9/17/2012 Long Term Monitoring Established Annual Long Term Monitoring established within the 2012 Groundwater Monitoring and Sampling Work Plan, dated May 11, 2012. Paul Horwath
1/10/2013 Document, Report, or Work plan Review - other Reviewed the Kenai Gas Field Pad 34-31 2012 Groundwater Monitoring Report, dated November 30, 2012, prepared by Weston Solutions. The annual 2012 monitoring event was performed on May 30 and May 31, 2012. Thirteen monitoring wells (MW-1, MW-2, MW-4 through MW-12, MW-15 and MW-16), were sampled during the May 2012 sampling event. The groundwater flow direction was found to be flowing towards the west. Depth to groundwater ranged from 5.78 to 21.29 feet from the well monitoring point. DRO was detected in an off-pad monitoring wells MW-8 at 1.6 mg/L, MW-7 at 7.7 mg/L and MW-6 at 8.2 mg/L. Results of the Mann-Kendall Trend Analysis, indicates an expanding plume in the direction of groundwater flow, towards MW-7 and MW-6. The Petropore Passive Skimmer was removed from MW-4 on May 31, 2012. Alyce Hughey
12/9/2014 Update or Other Action Received SLR's Kenai Gas Field Pad 34-31 2013 Groundwater Monitoring Report, dated November, 2014. Paul Horwath
6/30/2015 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74306 WD-1 sump. Further evaluate Weston Solutions 2012 Groundwater Monitoring Report and SLR's 2013 Groundwater Monitoring Report. Paul Horwath
6/30/2015 Update or Other Action Added a Delayed status to the Workload Priority due to this site being an active natural gas drilling and production pad. Paul Horwath
7/18/2016 Document, Report, or Work plan Review - other Begin review of Brice Environmental's 2015 Groundwater Monitoring Report, dated May 2016. Request Brice signatures on report via e-mail communication to Hilcorp Alaska's Kelley Nixon. Paul Horwath
9/27/2017 Document, Report, or Work plan Review - other Issued conditional approval of the 2017 GW Monitoring Work Plan, which was prepared for Hilcorp by Brice Environmental. Paul Horwath
10/6/2017 Document, Report, or Work plan Review - other Approved Brice's 2017 Groundwater Monitoring Work Plan (amended). Paul Horwath
12/3/2018 Document, Report, or Work plan Review - other ADEC issued approval of Hilcorp Alaska's November 7, 2018 Utility Water Well Pumping Test Plan, conditioned upon Hilcorp hiring and involving a qualified environmental professional to document and report the findings of the test to ADEC. Paul Horwath
7/2/2019 Document, Report, or Work plan Review - other ADEC approved the 2019 Groundwater Monitoring Program Work Plan, which was prepared by Brice Environmental, as amended by the Brice Environmental June 24th response to ADEC's June 21st work plan review comments. Paul Horwath
3/16/2020 Document, Report, or Work plan Review - other Review the 2019 Groundwater Monitoring Report, a copy of the report is presented in Attachments. Peter Campbell
4/15/2020 Update or Other Action Comment to Hilcorp on water well use permit in support of drilling. The water wells in question are deep enough to not influence shallow groundwater contamination. Peter Campbell
3/3/2021 Document, Report, or Work plan Review - other Review Contaminated Soil and Water Management Plan for Flow Line Upgrades (February 2021) Peter Campbell
3/15/2021 Document, Report, or Work plan Review - other Flow Line Soil Management Plan - ADEC Approval Peter Campbell
9/8/2021 Document, Report, or Work plan Review - other Review and approve 2021 work plan. Peter Campbell
6/28/2023 Site Visit Pad inspection with DEC staff. Peter Campbell

Contaminant Information

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Control Type

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No associated sites were found.

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby