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Site Report: Middle Ground Shoals Onshore Fac.

Site Name: Middle Ground Shoals Onshore Fac.
Address: 52260 Wik Road, Nikiski, AK 99635
File Number: 2323.38.020
Hazard ID: 2423
Status: Active
Staff: Peter Campbell, 9072623412 peter.campbell@alaska.gov
Latitude: 60.734722
Longitude: -151.355556
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

Crude oil was spilled due to a malfunctioning valve. There have been a number of crude oil spills in this area over the history of the unit. There is contamination remaining underneath the buildings which will be cleaned up when the facility is decommissioned. Former Site Name was the LACT Building.

Action Information

Action Date Action Description DEC Staff
11/9/1995 Update or Other Action (Old R:Base Action Code = RARR - Remedial Action Report Review (CS)). Approval was given to leave in place the old contaminated soil that is next to and underneath building foundations. Bob Krogseng
3/19/1996 Site Added to Database Crude oil spill. Bob Krogseng
5/14/1996 Site Ranked Using the AHRM Ranked by Shannon and Wilson. S&W
6/15/1999 Institutional Control Record Established There is contamination remaining underneath the buildings which should be cleaned up when the facility is decommissioned. Donald Seagren
6/15/1999 Long Term Monitoring Established Approved groundwater monitoring plan. Department is still reviewing proposal to determine cleanup levels for the site. Donald Seagren
9/15/1999 Update or Other Action Review Quarterly GW Monitoring Report and workplan. Donald Seagren
9/16/1999 Update or Other Action Receive ACL request for 10X GW levels, begin review and compare with regulations. Donald Seagren
2/2/2000 Update or Other Action Approved verbal request from Larry Little to delay bailing MWs due to extreme weather conditions and deep snow. Cross Timbers will send written notification. Donald Seagren
6/26/2000 Update or Other Action Reviewed GW monitoring report and discussed questions with Greg Dubois. Reviewed and filed Public Notice verification regarding 10 times rule; answered questions regarding correct person/address for cost recovery purposes. Donald Seagren
10/9/2000 Update or Other Action Further revisions to ROD. Send to Frechione for review and to send to Juneau. Donald Seagren
12/14/2000 Update or Other Action Copy of a Record of Decision signed and sent to Cross Timbers on 14 December 00. Donald Seagren
12/21/2000 Record of Decision Revised ROD signed and sent to Cross Timbers. Corrected soil concentration levels. Rich Sundet
2/27/2001 Interim Removal Action Approved Received copy of deed notice being recorded per requirements of ROD. Donald Seagren
5/21/2001 Update or Other Action Reviewed monitoring report. Approved frequency change to yearly; will leave MW-H8 in monitoring program for one additional year to confirm trends. If PAH levels stay below cleanup levels, the MW can be abandoned next year. Donald Seagren
8/20/2001 Update or Other Action Cross Timbers Operating Company is now known as XTO Energy, Inc. Donald Seagren
8/20/2001 Update or Other Action Reviewed draft site assessment for contaminated soil discovered during work on effluent pipe. Corrected RRO cleanup levels and requested signed hard copy of report. Donald Seagren
8/24/2001 Update or Other Action Reviewed Containment Area Release report. For record keeping gave it spill 2000230120801. Soil confirmation samples from excavation and stockpile were all below ACLs approved on 21 December 00 . Permission given to close site and backfill excavation with stockpiled soil. Donald Seagren
8/24/2001 Update or Other Action Reviewed assessment report on former sump tank excavation. Confirmation samples all below ACLs established for this facility. Approval to proceed with new tank construction. Drummed and stockpiled soil must be inspected weekly for leakage, until soil is remediated. Any deficiencies must be repaired immediately. Donald Seagren
1/13/2003 Update or Other Action Reviewed December 2002 monitoring report. Provided review comments re: MW abandonment & replacement, continued product recovery and continued LTM. Donald Seagren
6/16/2003 Update or Other Action Reviewed and approved 2003 Corrective Action and Monitoring Workplan for MW abandonment and drilling new monitoring/recovery well. Written approval will be sent once the signed workplan is received. Donald Seagren
11/6/2003 Update or Other Action Reviewed August 03 GW monitoring & product recovery report. Approved annual product recovery event to coincide with annual GW monitoring. Donald Seagren
3/26/2004 Update or Other Action File number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
9/10/2004 Update or Other Action Monitoring attempted but no water in MW due to low water year for the area. 2 recovery wells bailed of approximately 1/3 of a gallon of crude oil emulsion. Sorbent socks will be placed for passive recovery. GW sampling to be attempted again on October. Donald Seagren
12/20/2004 Update or Other Action Reviewed 2004 ground water monitoring report. Extreme low water prevented sampling until November. Monitor well 7 had no hydrocarbons detected. Approximately 1/3 of a gallon of free product was recovered from the other 2 monitor wells. No change in the risk to human health and the environment. Annual monitoring will continue in 2005. Suggestions for an inexpensive free product recovery system for 2" monitor wells was passed on to SLR. Donald Seagren
9/16/2005 GIS Position Updated Using Figures 1 and 2 from a 2003 Corrective Action and Groundwater Monitoring Results Middle Ground Shoal OnShore Production Facility, from SLR Alaska, dated August 2003, 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
1/25/2006 Update or Other Action Reviewed 05 monitoring report. No significant change to contaminatn levels. MW7 continues bleow cleanup levels. MW9 & MW16 continue to contain free product. Passive recovery of free product using sorbent pads will continue in 06. Sorbent pads are replaced quarterly to increase recovery rate. Levels have decreased to just a trace of free product remaining. No change to risk tohuman health or the environment. Donald Seagren
3/6/2007 Update or Other Action Reviewed 06 monitoring report.RW-1 & MW-9 continue to have free product (0.61' & 0.01' respectively). passive recovery, utilizing downhole sorbents continues. Recharge at MW7 is extremely slow. Monitoring results compare with historical monitoring data. Plume is stable and is in a perched aquifer, not utilized as a drinking water source. the risk to hhuman health and the environment is minimal. Monitoring and passive recovery efforts will continue in 07. Donald Seagren
3/6/2007 Exposure Tracking Model Ranking Donald Seagren
6/11/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. Alyce Hughey
1/13/2009 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 73400 name: leaking valve & spills Alyce Hughey
6/10/2009 Update or Other Action Reviewed the 2008 Groundwater Monitoring Results Report, dated May 19, 2009, from SLR International Corp. for Paul Horwath, and prepared a summary for his review and oversight. Site conditions are remaining stable. The groundwater concentrations in MW-7 are remaining below the groundwater cleanup levels. In an effort to increase recovery of the crude oil in the former Sump Pit Area, MW-9 and RW-1 sorbents were replaced seven times during 2008. When MW-9 and RW-1 were measured for free product, the wells contained no measureable thickness of free product during this sampling event. During 2009 the sorbents at MW-9 and RW-1 are scheduled to be replaced at least quarterly, and the groundwater sampling is scheduled for October. Alyce Hughey
1/28/2010 Document, Report, or Work plan Review - other Reviewed the 2009 Groundwater Monitoring Results Middle Ground Shoal Onshore Production Facility, dated December 1, 2009, from SLR International Corp. for Paul Horwath. Site conditions are remaining stable. The groundwater concentrations in MW-7 are remaining below the groundwater cleanup levels. In an effort to increase recovery of the crude oil in the former Sump Pit Area, MW-9 and RW-1 sorbents were replaced quarterly during 2009. When MW-9 and RW-1 were measured for free product, MW-9 did not contain measurable free product, and RW-1 contained 0.01 feet of measureable free product. During 2010 the sorbents at MW-9 and RW-1 are scheduled to be replaced at least quarterly, and if no measureable free product is observed in 2010, it may be proposed that MW-9 and RW-1 be abandoned in place and monitoring be continued at MW-7. Alyce Hughey
4/21/2011 Document, Report, or Work plan Review - other Reviewed the 2010 Groundwater Monitoring Results Middle Ground Shoal Onshore Production Facility, from SLR International Corp., dated March 14, 2010 for Paul Horwath. The groundwater sample concentrations in MW-7 tested non-detect for all the analytes tested during the September 30, 2010 sampling event. To increase recovery of the crude oil in the former Sump Pit Area, MW-9 and RW-1 sorbents were replaced quarterly during 2010. When RW-1 and MW-9 were measured for free product, the product thickness at well MW-9 was 0.02 feet. The well was dry so the product measured on the probe is thought to be residual product in the well end cap. There was no measurable product in well RW-1. Alyce Hughey
1/13/2012 Update or Other Action Project Manager changed from Paul Horwath to Peter Campbell per Paul Horwath. Alyce Hughey
5/25/2012 Document, Report, or Work plan Review - other Reviewed the 2011 Groundwater Monitoring Results, Middle Ground Shoal Onshore Production Facility, dated May 18, 2012, prepared by SLR International Corporation. On December 6, 2011 the annual groundwater sampling event was conducted with concentrations in MW-7 containing DRO at 0.60 mg/L and RRO at 0.98 mg/L. Monitoring well MW-9 contained no water or measurable product, and RW-1 had no measurable product. Alyce Hughey
7/26/2012 Long Term Monitoring Complete A letter was issued to XTO Energy discontinuing the requirement for long term monitoring and requesting that the remaining monitoring wells on site be decommissioned. Peter Campbell
9/17/2012 Document, Report, or Work plan Review - other Peter Campbell issued an approval for the decommissioning of the three monitoring wells located at the former sump facility contingent upon compliance that there are no deviations from the August 31, 2012, work plan without prior ADEC approval. Alyce Hughey
10/26/2012 Document, Report, or Work plan Review - other Reviewed the XTO Engergy Middle Ground Shoal Onshore Production Facility Well Decommissioning Report, dated October 8, 2012, prepared by SLR International Corporation. Monitoring wells MW-7, MW-9 and RW-1 were decommissioned on September 24, 2012. Alyce Hughey
7/1/2015 Update or Other Action Site remediation delayed until site closure. Peter Campbell

Contaminant Information

Name Level Description Media Comments
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Benzene > Table C Groundwater
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
DRO > Table C Groundwater
RRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
RRO > Table C Groundwater
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
GRO > Table C Groundwater

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP

Requirements

Description Details
Groundwater Monitoring
When Contaminated Soil is Accessible, Remediation Should Occur

No associated sites were found.

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