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Site Report: Swanson River Compressor Plant

Site Name: Swanson River Compressor Plant
Address: Mi. 18.8 Swanson River Rd, Sterling, AK 99672
File Number: 2334.38.013
Hazard ID: 1303
Status: Active
Staff: Peter Campbell, 9072623412 peter.campbell@alaska.gov
Latitude: 60.730556
Longitude: -150.860000
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

During soil studies beneath the compressor plant, petroleum (diesel and residual range) contamination was encountered in the soils and groundwater. This site is a potential candidate for Establishment of Institutional Controls. Additional contamination at this facility is also tracked under Hazard ID 175 / file number 2334.48.016; and Hazard ID 26694 / file number 2334.38.060.

Action Information

Action Date Action Description DEC Staff
6/1/1990 Long Term Monitoring Established Beginning of semi-annual Long-Term Monitoring at this site started as a result of the PCB Remediation Investigation. Spill report not made to the department until 12/16/91. Donald Seagren
6/15/1994 Update or Other Action (Old R:Base Action Code = RARR - Remedial Action Report Review (CS)). Donald Seagren
6/28/1994 Site Added to Database Petroleum contamination. Former Staff
6/28/1994 Site Ranked Using the AHRM Initial ranking. Former Staff
1/8/1996 Update or Other Action (Old R:Base Action Code = RARR - Remedial Action Report Review (CS)). Reviewed quarterly GW monitoring/sampling report. Donald Seagren
8/18/1997 Update or Other Action Reviewed PCB ground water monitoring report. Donald Seagren
12/6/1999 Update or Other Action Reviewed semi-annual PCB GW monitoring report. Donald Seagren
7/20/2000 Update or Other Action Reviewed semi-annual PCB GW monitoring report Donald Seagren
12/1/2000 Site Number Identifier Changed Changed the Workplan from 01 to 09 to reflect PCB contamination. Donald Seagren
12/21/2001 Update or Other Action Reviewed semi-annual monitoring report. No PCB impact to the groundwater. Donald Seagren
5/6/2002 Site Characterization Workplan Approved Reviewed and approved Abbreviated Work Plan for Limited Environmental Investigation. Gravel will be excavated and moved from Pad 14-15 to the Compressor plant to be used in construction of an new electric shop. Donald Seagren
5/14/2002 Meeting or Teleconference Held Site inspection of pads where gravel will be removed for the base of the new electric shop to be constructed this year. Donald Seagren
8/21/2002 Update or Other Action Reviewed Semi-annual groundwater monitoring report. first 2002 report. Donald Seagren
12/20/2002 Update or Other Action Reviewed semi-annual monitoring report and discussed with John Hammelman. All MWs continue to be ND @ 0.50ug/L. Donald Seagren
4/28/2004 Update or Other Action File number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
1/13/2005 Update or Other Action Reviewed the October 04 monitoring report. No PCBs found in any of the monitor wells. No change in status or the risk to human health or the environment. Donald Seagren
10/6/2005 GIS Position Updated Using the Vicinity Map from a 1991 Groundwater Monitoring Report, Compressor Plant Facility Swanson River Field, from ENSR, dated October 1991, 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, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
1/6/2006 Update or Other Action Reviewed November 8-9 2005 monitoring report. No PCBs detected in any of the samples. No changes in contaminants or groundwater flow direction from previous sampling events. No risk to human helath or the environment was detected. Donald Seagren
5/7/2007 Exposure Tracking Model Ranking Donald Seagren
6/11/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. On 6-30-08 transferred from Paul Horwath to Don Fritz per Paul Horwath. Alyce Hughey
11/3/2011 Update or Other Action Groundwater monitoring is being conducted at this site on an annual basis. Last report received was the January 12, 2010 Groundwater Monitoirng Report. Alyce Hughey
11/16/2011 Update or Other Action Site transferred from Don Fritz to Peter Campbell per Paul Horwath. Alyce Hughey
12/14/2011 Document, Report, or Work plan Review - other Reviewed the 2008 Compressor Plant PCB Monitoring Report, dated December 23, 2008, from OilRisk Consultants. During the 2008 PCB groundwater samplings conducted on June 4, 2008 and November 17, 2008 all monitoring wells tested did not detect PCB’s within the samples taken. The groundwater flow direction was flowing towards the northwest which is consistent with previous sampling events. Alyce Hughey
12/14/2011 Document, Report, or Work plan Review - other Reviewed the 2009 Compressor Plant PCB Monitoring Report, dated January 12, 2010, from OilRisk Consultants. During the 2009 PCB groundwater samplings conducted on June 15, 2009 and November 18, 2009 all monitoring wells tested did not detect PCB’s within the samples taken. The groundwater flow direction was flowing towards the northwest which is consistent with previous sampling events. The groundwater levels dropped by 2.00 to 4.50 feet within the monitoring wells from the June 15, 2009 sampling until the November 18, 2009 sampling. Alyce Hughey
12/19/2011 Document, Report, or Work plan Review - other Reviewed the Plant 10 Abandonment Phase I Completion Report 2011 Activities Swanson River Field, dated November 29, 2011, from Chevron North America Exploration and Production. The Phase I Plant 10 Abandonment Project began on June 27, 2011 and was completed on November 1, 2011. Ten areas were removed above the concrete slab and ground surface within the existing Compressor Plant footprint (E-7, E-8, and E-9 Building), (C-4 Regenerator Skid), (P.S. K-5 Skid), (Deethanizer Skid), (LTS Skid #1), (LTS Skid #2), (K-1 Skid), (K-2 Skid), (K-3 Skid), and (Misc. associated exterior pipes). Once the structures were removed and the concrete slabs cleaned, the slabs were sampled and analyzed for PCB contamination; then a polypropylene geotextiele waterproof sealant was installed over slabs P.S. K-5 Skid, Deethanizer Skid, LTS Skit #1, and LTS Skid #2. The final remediation of PCB contaminated soils will be initiated at the time of facility abandonment identified in Amendment Number 4 to the August 1985 Compliance Order by Consent. Alyce Hughey
2/24/2014 Document, Report, or Work plan Review - other Reviewed the 2013 Compressor Plant 10 PCB Monitoring Report, dated February 12, 2014, prepared by AECOM Technical Services, Inc. During the 2013 PCB groundwater samplings conducted on June 26, 2013 and October 15, 2013, all monitoring wells tested did not detect PCB’s within the samples taken. The depth to groundwater was 4.73 to 7.43 feet on June 26, 2013 and 5.6 to 10.01 feet on October 15, 2013. The groundwater flow direction was flowing in a northwest/westerly direction. Alyce Hughey
2/26/2015 Potentially Responsible Party/State Interest Letter Peter Campbell
9/28/2016 Site Characterization Workplan Approved Work plan approval issued for assessment of glycol and PCB contamination at the site of a glycol release. Peter Campbell
12/21/2016 Update or Other Action Site Characterization Report for PCB and glycol sampling received. Peter Campbell
1/20/2017 Site Visit Site visit to Pad 14-3 to observe monitoring well locations. The COBC requires that wells on this pad be sampled annually. Peter Campbell
1/20/2017 Document, Report, or Work plan Review - other Review of the 2016 Groundwater Sampling Report for PCB analysis. It was noted that one-third (33) of the historical sample results reported as non-detect were at detection levels above the cleanup level. We have required that method detection levels be specified to the laboratory and met for reporting. Sample results for 2016 were non-detect. Peter Campbell
2/1/2017 Update or Other Action In reviewing the Compliance Order By Consent it was determined that Groundwater was to be sampled at SCU 14-3, the pad where PCB's were stockpiled and remediated. We have requested that Chevron develop a work plan to conduct groundwater monitoring at this pad. Peter Campbell
2/1/2017 Document, Report, or Work plan Review - other We have completed our review of the PCB Site Characterization Report at the Glycol Release, and find the assessment work to be sufficient to identify the extent of the PCB impacts at the location of the glycol spill. ADEC has requested a cleanup work plan for the removal of PCB impacted soils. Peter Campbell
3/1/2017 Document, Report, or Work plan Review - other Reviewed and approved the Work Plan Addendum (Feb 20, 2017) for further assessment of glycol at the north west side of the former Plant 10 excavation for a glycol spill. One confirmation sample had glycol that exceeded the migration to groundwater cleanup levels. Further assessment will delineate the extent of glycol contamination in preparation for cleanup work of both glycol and PCBs this summer. Peter Campbell
4/10/2017 Update or Other Action Remaining actions and associated ADEC cost tracking will be under the project Swanson River Pressure Maintenance Plant Ethylene Glycol 2334.38.060 and for PCB issues 2334.38.016. Peter Campbell
5/3/2017 Site Visit Observe surface conditions of sample locations and monitoring wells. Also visit Pad 14-3 to determine status of monitoring wells. Peter Campbell
5/22/2017 Document, Report, or Work plan Review - other Approved "Cable Tray Installation Excavation Activities Work Plan" that covers excavation, storage and sampling and disposal of soils potentially contaminated with PCBs. Approximately 11 cubic yards of soil will be excavated and stored in super sacks. The soils will be sampled, and if PCBs are detected at concentrations above 1 ppm, the soils will be transferred off site to an approved disposal facility. Peter Campbell
7/11/2018 Document, Report, or Work plan Review - other Review and approve Produced Water Line & Electrical / Instrumentation Line Installation Soil Management Work Plan. Work near the compressor plant will involve testing soils for PCB contamination. Peter Campbell
8/23/2018 Update or Other Action Issued letter to Chevron modifying the groundwater sampling schedule at Swanson River 14-3 (SCU 14-3). Sampling has not been conducted here for many years. Recent sampling for PCB in groundwater did not find any detections in the site monitoring wells. The sampling schedule will be revised to sample the wells in 2018, and to continue sampling the wells every five years for the life of the field. Peter Campbell
8/13/2019 Document, Report, or Work plan Review - other Review and conditionally approve a revised Soil Management Plan for the installation of a fence and gate repair project that may encounter PCB impacted soils. Peter Campbell

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details
Hazard ID Site Name File Number
26694 Swanson River Pressure Maintenance Plant Ethylene Glycol 2334.38.060
175 Swanson River Field PCB Remediation 2334.38.016

Missing Location Data

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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