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.

Site Chronology
IC / Closure Details
Documents
Associated Sites

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

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
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

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

Type

Details

CS Database Notation And Letter To Landowner/RP

Requirements

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

Description

Details

Groundwater Monitoring

When Contaminated Soil is Accessible, Remediation Should Occur

November 2022 Contaminated Soil and Water Management Plan

No associated sites were found.

Missing Location Data

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Alaska Department of Environmental Conservation

Site Report: Middle Ground Shoals Onshore Fac.

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

November 2022 Contaminated Soil and Water Management Plan

Missing Location Data

State of Alaska Department of Environmental Conservation