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Site Report: Tesoro Northstore #79, Formerly Garrett's #1

Site Name: Tesoro Northstore #79, Formerly Garrett's #1
Address: 2811 New Seward Highway, Anchorage, AK 99503
File Number: 2100.26.079
Hazard ID: 24727
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.195000
Longitude: -149.867200
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 site assessment was conducted to evaluate soil and groundwater quality during removal of two 10,000-gallon gasoline USTs, one 10,000-gallon diesel fuel UST, one 500-gallon waste oil UST, one 250-gallon waste oil UST, six dispensers and a vehicle lube pit and sand trap/oil-water separator was also decommissioned. Soil and groundwater were found to be impacted by petroleum hydrocarbons. A total of 1,028.79 tons of contaminated soil was thermally remediated at Clean Soils, Inc., and Alaska Soil Recycling. A Soil Vapor Extraction System was installed, and in October 2005 an Air Sparging System was installed. The air sparge treatment system was started in November 2006. SVE, air sparge, and long-term groundwater monitoring continues. Updated 2-26-07 by Paul Horwath. Update 9-18-09 by Pam Clemens: The 250-gallon waste oil tank above is listed on the UST registration as a 400-gallon tank that was taken out of service in 1997.

Action Information

Action Date Action Description DEC Staff
7/7/1997 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77775 During a geotechnical investigation, conducted on July 7, soil contamination was found. Former Staff
7/7/1997 Site Added to Database Former Staff
8/7/1997 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Work on Tank closure and excavation of contaminated soils began. Former Staff
11/6/1997 Underground Storage Tank Site Characterization or Assessment SA report received from consultant. Former Staff
2/11/1998 Update or Other Action Documentation received on the thermal treatment of contaminated soils hauled to the "Clean Soils" facility. Former Staff
2/17/1998 Leaking Underground Storage Tank Corrective Action Underway Proposed Workplan received from consultant. Former Staff
3/12/1998 Update or Other Action Dept completed review of SA and Workplan and issued letter to the consultant and RP. Needed clarification on the size of the diesel tank and noted that a RI is needed. Piping for an SVE system was installed at the time of tank closure. Worplan, which called for a Phase 2 RI, was not approved at this time. Asked for a revised siting og MW G3, a report on the SVE pilot test, design plans for the system and an explanation as to why air sparging, which was previously specified in the SA, was not included in the workplan. Former Staff
3/20/1998 Update or Other Action Consultant responded to Dept's comments on the SA and Workplan. Former Staff
3/31/1998 Update or Other Action Dept responded to the revised SA and additional info provided by the consultant. Workplan approved and noted that data pkg still due for thermal remediation of soils. Former Staff
4/9/1998 Update or Other Action Dept resonded to receipt of documentation for thermal remediation of soils, finding it to be satisfactory. Former Staff
4/10/1998 Leaking Underground Storage Tank Corrective Action Underway Dept responded to report on pilot test of SVEsystem and system design, received on Mar 23, 98, approving it. Former Staff
5/13/1998 Long Term Monitoring Established Dept responded to Monitoring report, for Mar 98, which was received May 6,98, noting significant reduction in BETX at MW G-1 but that levels in other MWs remained fairly constant. Former Staff
9/10/1998 Update or Other Action Paul Pinard sent a follow up letter after reviewing the June 1998 Monitoring Event from Gilfilian Engineering, dated August 10, 1998. Alyce Hughey
12/2/1998 Release Investigation Paul Pinard sent a letter with review comments after reviewing the Phase II Release Investigation from Gilfilian Engineering, dated September 15, 1998. Alyce Hughey
12/8/1998 Update or Other Action Paul Pinard sent a letter with review comments after reviewing the September 1998 Monitoring Event from Gilfilian Engineering, dated November 2, 1998. Alyce Hughey
2/9/1999 Update or Other Action Paul Pinard sent a conditional approval letter to the proposed work plan for 1999. Alyce Hughey
4/8/1999 Update or Other Action Paul Pinard sent a letter expressing the concern of the remaining high levels of groundwater contamination, and requested a meeting to discuss more aggressive treatment. Alyce Hughey
11/1/1999 Update or Other Action Paul Pinard sent a letter after reviewing the August 18, 1999 Monitoring Report for the March & June 1999 monitoring events. Alyce Hughey
12/1/1999 Long Term Monitoring Established Received Sept. 1999 Monitoring Event and Historical Trend Summary report from Gilfilian Engineering. Monica English
1/20/2000 Update or Other Action Drinking Water Well Search report received from Gilfilian Engineering. Monica English
3/23/2000 Long Term Monitoring Established Received December 1999 Ground Water Monitoring report from Gilfilian Engineering. Monica English
4/24/2000 Long Term Monitoring Established Received March 2000 Monitoring Event report from Gilfilian Engineering. Monica English
12/29/2000 Long Term Monitoring Established Received October 2000 Monitoring Event & Comprehensive Analysis report from Gilfilian Engineering. Monica English
8/16/2001 Long Term Monitoring Established Received May 2001 Monitoring Event report from Gilfilian Engineering. Monica English
11/1/2001 Long Term Monitoring Established Received August 2001 Monitoring Event report from Gilfilian Engineering. Monica English
7/19/2002 Long Term Monitoring Established Received April 2002 Monitoring Event report from Gilfilian Engineering. Monica English
1/14/2004 Leaking Underground Storage Tank Corrective Action Underway Approval of 2004 Work Plan. Monica English
8/25/2004 Update or Other Action Conference call with consultant to discuss proposed modifications to the approved 2004 Work plan. Modifications include the addition of air sparge wells to the current remediation system. Monica English
9/8/2004 Update or Other Action Staff approved modifications to the 2004 workplan. Modifications include installation and operation of 3 air sparge wells. Monica English
11/1/2004 Document, Report, or Work plan Review - other April 2004 Monitoring Event Report. GW contaminant trends conssitent with previous sampling. Test Hole MW exceeds GCL for benzene & GRO. SVE remediation system continues to operate. Monica English
11/15/2004 Update or Other Action Staff attend the annual environmental planning meeting with Tesoro and MWH, for activities to be conducted in 2005. Monica English
11/18/2004 Update or Other Action File number 2100.26.079 assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
1/25/2005 Leaking Underground Storage Tank Corrective Action Underway ADEC approval issued for the 2005 calendar year Corrective Action work plan. Monica English
11/15/2005 Update or Other Action Annual Environmental Planning meeting between ADEC, Tesoro and MWH. Monica English
11/22/2005 Update or Other Action Calendar year 2006 Work plan is approved. Groundwater monitoring will be continued to track migration and trends of contaminants present. The remediation system (SVE/AS) will continue to be operated and maintained. Monica English
10/9/2006 Update or Other Action Project manager changed from Monica English to Paul Horwath, per Paul Horwath. Alyce Hughey
11/16/2006 Update or Other Action Using Figure 1 from the April 2005 Monitoring Event Report, from Montgomery Watson Harza, dated September 2005, in conjunction with TopoZone Pro and the Anchorage Live Maping, entered the coordinates for this site. Metadata includes No Topo Basemap, Black and White Aerial Photo, TopoZone Pro Street Maps, View Scale 1:9,840, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
12/21/2006 Document, Report, or Work plan Review - other Reviewed MWH's July 2006 Monitoring Event Report Final, dated November 2006. Groundwater contaminant concentrations remain about the same, with the longer term trend declining. Paul Horwath
1/29/2007 Document, Report, or Work plan Review - other Reviewed MWH's April 2006 Monitoring Event Report Final, dated September 2006. The report covered a groundwater monitoring well sampling event from April 2006. Water quality data were stable and similar to the prior sampling data. A SVE system is operating at this site. An air sparge system is to be installed to assist in the treatment of contaminated soil and groundwater remaining in the NW portion of the property. Paul Horwath
2/26/2007 Document, Report, or Work plan Review - other Reveiwed MWH's Tesoro 2 Go Mart #79 (Former Garrett's Tesoro #1), October 2006 Montoring Event Report Final, dated January 2007. Air sparge and SVE treatment continues at this site. GW contamination remains and is stable to deminishing. P.Horwath Paul Horwath
12/27/2007 Document, Report, or Work plan Review - other Reviewed the April 2007 Monitoring Event Report Final prepared by MWH, dated July 2007. Air sparge/SVE systems operating. GW quality similar to last sampling event. GW quality improving over time. Paul Horwath
5/5/2008 Document, Report, or Work plan Review - other Reviewed MWH's October 2007 Monitoring Event Report Final report, dated April 2008. Two MWs sampled. GW quality similar to prior events. Contamination still exceeding ADEC GW cleanup leves in monitoring well Test Hole MW. Declining GW contaminant trend has been established over the past 10 years of GW sampling. Paul Horwath
5/23/2008 Document, Report, or Work plan Review - other Reviewed MWH's August 2007 Monitoring Event Report Final, dated April 2008. GRO and DRO contamination detected in MW Test Hole Well exceeding GW cleaup levels. SVE and air sparge treatment continues at this site with 3 GW sampling events per calendar year. Paul Horwath
11/4/2008 Update or Other Action Reviewed the April 2008 Monitoring Event Report, dated August 2008, from MWH for Paul Horwath and provided him a summary for his review and oversight. Site conditions remain stable with a continual decrease in hydrocarbon concentrations. There has been a change in the groundwater flow direction since the installation of the air sparge system in October of 2006. Based on the data collected over the past two years, the operation of the new air sparge system might be influencing the direction of the groundwater flow at the site. Alyce Hughey
12/17/2008 Update or Other Action Reviewed the October 2008 Monitoring Event Report, dated November 2008, from MWH for Paul Horwath and provided him a summary for his review. Site conditions remain stable with a continual decrease in hydrocarbon concentrations. With the adjustment of the air sparge system now operating on a 2-hour on/2-hour off continuous cycle at AS-1 in an effort to increase the effectiveness near Test Hole MW, where the highest concentrations levels are located, it is hoped that there will be a continual trend of decrease concentration levels. Alyce Hughey
3/31/2009 Document, Report, or Work plan Review - other Reviewed the January 2009 Monitoring Event Report, dated March 2009, from MWH for Paul Horwath. Site conditions remain stable with a continual decrease in hydrocarbon concentrations. Since the adjustment of the air sparge system now operating on a 2-hour on/2-hour off continuous cycle at AS-1 during 2008, it appears that the concentrations are decreasing in Test Hole MW, where the highest contaminant levels were located. Some residual contamination above the groundwater cleanup levels in Monitoring Wells G-1 and G-3 has resurfaced possibly due to the flooding event prior to sampling. Alyce Hughey
11/27/2009 Document, Report, or Work plan Review - other Reviewed the July 2009 Monitoring Event Report, dated September 2009, from MWH for Paul Horwath. Site conditions remain stable with a continual decrease in hydrocarbon concentrations. The Benzene concentrations detected in G-3 have decreased from the first monitoring event performed during 2009 to now just above the groundwater cleanup levels. The treatment system is currently operating 24 hours a day with the air sparging system operating on a 2-hour on/off cycle. Since the air sparge system was adjust in August of 2008 to a 2-hour on/off cycle the dissolved oxygen levels in Test Hole MW have been consistently elevated generally in the 7 to 9 milligrams per liter range. Alyce Hughey
5/6/2010 Document, Report, or Work plan Review - other Reviewed the January 2010 Monitoring Event Report, from MWH, dated March 2010 for Paul Horwath. Site conditions remain consistent with the previous groundwater monitoring performed at the site in July of 2009. Benzene concentrations are still present in monitoring well G-3, with the thought that an off-site source is the cause. The treatment system is currently operating 24 hours a day with the air sparging system operating on a 2-hour on/off cycle with the focus on AS-1. Alyce Hughey
11/15/2010 Document, Report, or Work plan Review - other Reviewed the July 2010 Monitoring Event Report, dated October 2010, from MWH for Paul Horwath. During the July 29, 2010 groundwater sampling event benzene concentrations were detected above the groundwater cleanup levels in monitoring well G-3. Monitoring well G-3 has detected benzene above the groundwater cleanup levels for the past four sampling events. The last time G-3 detected benzene above the groundwater cleanup levels was in April of 2005. The soil vapor extraction system is currently operating 24 hours a day with the air sparge system operating on a 2-hour on/off cycle with the focus on AS-1. Alyce Hughey
11/16/2010 Meeting or Teleconference Held Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2011. Alyce Hughey
11/16/2010 Meeting or Teleconference Held Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2011. Paul Horwath
7/29/2011 Document, Report, or Work plan Review - other Reviewed the July 2011 Mid-Point Rebound Test Sampling, dated July 21, 2011, from MWH. On July 5, 2011 a mid-point rebound test was performed. One groundwater monitoring well was sampled with low levels of benzene and toluene being detected below the groundwater cleanup levels. Air samples were taken after the remediation system was turned on and air samples were taken after 15, 60 and 120 minutes with GRO and BTEX not being detected in the air samples taken. The remediation systems will remain off for an additional 6 months and then another monitoring event will be conducted to see if petroleum hydrocarbons return to the groundwater. Alyce Hughey
12/1/2011 Meeting or Teleconference Held Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2012. Alyce Hughey
12/1/2011 Meeting or Teleconference Held Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2012. Paul Horwath
3/12/2012 Document, Report, or Work plan Review - other Reviewed the December 2011 Monitoring Event and Regound Test Report, dated February 2012, from MWH. The twelve month rebound test was conducted on December 14, 20and 21, 2011. Groundwater samples were collected from all of the groundwater monitoring wells on December 14, 2011; with only one well G-3, detecting Benzene above the groundwater cleanup levels at 0.0375 mg/l located cross-gradient of the site on the other side of the New Seward Highway. All of the on-site groundwater monitoring wells remained below the groundwater cleanup levels. Air samples were taken after the remediation system was started on December 20, 2011 and samples were collected after one and twenty-four hours. The air samples were analyzed for BTEX and GRO, with none of the analytes being detected in the air samples. Alyce Hughey
6/6/2012 Meeting or Teleconference Held Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss the Corrective Action Complete with Institutional Controls proposed to be issued for the site. Alyce Hughey
10/4/2012 Cleanup Complete Determination Issued Residual soil contamination remains in the subsurface soil exceeding the ADEC's Method Two 'Direct Contact' soil cleanup levels; however ADEC has determined there is no unacceptable risk to human health or the environment provided that the site remains in compliance with the established institutional controls. Therefore, ADEC is issuing a Corrective Action Complete Determination with Institutional Controls, subject to the following ICs and/or conditions: Any future change in land use may impact the exposure assumptions. If land use and/or ownership changes, the current land owner shall report these changes to ADEC within 14 days, as these ICs may no longer be protective and ADEC may require additional remediation and/or ICs. Water wells may not be installed on this property without the prior notification and approval of ADEC. The most recent soil sample analytical data reported BETX, GRO, and DRO contamination exceeding the applicable soil cleanup levels with the attached MWH Figure 1, Area of Concern for Deed Notice. Any proposal to excavate, transport, move, treat, and/or dispose of residual sub-surface contaminated soil located more than 5 feet below ground surface within this area of concern requires prior ADEC notification and approval. A Notice of Environmental Contamination (NEC) will be placed on the property and recorded in the Anchorage, Alaska Department of Natural Resources Land Recorder's Office. All groundwater monitoring wells associated with this project must be decommissioned in accordance with ADEC's Monitoring Well Guidance. Paul Horwath
10/26/2012 Institutional Control Record Established Institutional Controls established and entered into the database. Paul Horwath
11/14/2012 Meeting or Teleconference Held Paul Horwath and Alyce Hughey attended the annual planning meeting at MWH office in Anchorage to discuss the proposed decommissioning activities to be conducted in 2013. Alyce Hughey
6/6/2013 Long Term Monitoring Complete Administrative action added during a quality control check. Kristin Thompson
7/23/2013 Document, Report, or Work plan Review - other Reviewed the June 2013 Monitoring Wells Decommissioning Report, dated July 16, 2013, from MWH. On June 19 and 20, 2013 monitoring wells G-1, G-2, G-3, Test Hole MW and UST MW were decommissioned. The former subsurface remediation systems (air sparge and soil vapor extraction) were capped off and left in place. The above ground remediation equipment blowers and compressors were removed on May 15, 2013. Alyce Hughey
7/30/2013 Meeting or Teleconference Held Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss monitoring wells decommissioned. Alyce Hughey
7/30/2013 Meeting or Teleconference Held Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss monitoring wells decommissioned. Alyce Hughey
12/3/2013 Meeting or Teleconference Held Paul Horwath and Alyce Hughey attended the annual planning meeting at MWH office in Anchorage to discuss the decommissioning work performed at the site in 2013. Alyce Hughey
11/7/2014 Institutional Control Compliance Review IC compliance review conducted and staff changed from Paul Horwath to IC Unit. Reminder system set to follow up with the responsible party in 2015. Kristin Thompson
12/22/2015 Institutional Control Compliance Review Subsequent IC compliance review conducted. Scheduled to send an IC reminder letter. Nathan Maxwell
12/23/2015 Institutional Control Update An IC reminder letter was sent to the responsible party on this date. Nathan Maxwell
6/8/2017 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. The reminder system is set to follow-up every three years. Kristin Thompson
4/15/2019 Institutional Control Update An IC reminder letter was e-mailed to the responsible party/landowner on this date. Mossy Mead
5/29/2024 Institutional Control Compliance Review IC compliance review completed on this date. An IC reminder letter was e-mailed to the landowner. The next review will be in three years’ time. Gaige Robinson

Contaminant Information

Name Level Description Media Comments
DRO < Method 2 Most Stringent Soil
GRO > Human Health/Ingestion/Inhalation Soil
BTEX > Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Notice of Environmental Contamination A Notice of Environmental Contamination will be recorded in the Anchorage Recording District on this property.

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site. Standard condition.
Excavation / Soil Movement Restrictions Any proposal to excavate, transport, move, treat, and/or dispose of residual sub-surface contaminated soil located more than 5 feet bgs requires prior ADEC notification and approval.
Groundwater Use Restrictions Municipal public water service is provided to this property. Water wells may not be installed on this property without the prior notification and approval of ADEC.
Other Any future change in land use may impact the exposure assumptions therefore, if land use and/or ownership changes, the current landowner shall report these changes to ADEC within 14 days, as these ICs may no longer be protective and ADEC may require additional remediation and/or ICs. Additionally, Tesoro Refining and Marketing Company shall investigate and report the current land use to ADEC every three years or as soon as they become aware of any changes.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) Standard condition.

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