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Site Report: Tesoro - Northstore #14

Site Name: Tesoro - Northstore #14
Address: 341 Boniface Parkway, Anchorage, AK 99518
File Number: 2100.26.086
Hazard ID: 23257
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.221300
Longitude: -149.778000
Horizontal Datum:

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 the upgrading of the one 10,000 gallon unleaded regular gasoline, one 10,000 gallon premium unleaded gasoline, and one 5,000 gallon diesel underground storage tanks on August 26, 1995, soil and groundwater contamination was encountered. Approximately 136 cubic yards of contaminated soils was excavated and treated at Clean Soils, and approximately 35 cubic yards of peat contaminated soils was excavated and treated at Anchorage Soil Recycling. Long term monitoring was established and a Soil Vapor Extraction System installed. On July 19 to 27, 2005 the tanks were upgraded to one 12,000 gallon premium unleaded gasoline and one 15,000 gallon regular unleaded gasoline, along with the SVE System was replaced with a new SVE system. Approximately 1,517 tons of contaminated soil was removed in 2005 and thermally remediated at Anchorage Soil Recycling. Tesoro installed three new (replacement) GW monitoring wells in the fall of 2006. Updated 2-14-07 Paul Horwath.

Action Information

Action Date Action Description DEC Staff
8/30/1995 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77906 Contamination found during removal of dispensers and reported to the Dept. (Note that tanks were closed out a year later- on Aug 29, 1996). Former Staff
8/30/1995 Site Added to Database Former Staff
8/31/1995 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Contaminated soils excavated at site. Former Staff
9/29/1995 Update or Other Action Dept received request from consultant to haul contaminated soils to ASR for treatment. Request approved by Dept the same day. Former Staff
12/8/1995 Update or Other Action Dept received ltr from consultant providing info that 110 cy of contaminated soils were transported to ASR for treatment. Also provided results of samples collected during SA work and advised that SVE piping was installed. Former Staff
12/21/1995 Update or Other Action Dept received letter from ASR showing satisfactory treatment of 52.09 tons of contaminated soil. Former Staff
9/30/1996 Leaking Underground Storage Tank Corrective Action Underway Contaminated soils were excavated and hauled to 2 separate thermal remediation facilities for treatment. A total of 159.17 tons of mineral soil was treated by Clean Soils and ASR treated peat soils. Former Staff
12/10/1996 Underground Storage Tank Site Characterization or Assessment Consultant submitted a SA/Closure Report. Former Staff
2/6/1997 Update or Other Action Documentation on treatment of 159.17 tons of contaminated soil by Clean Soils was provided to the Dept. Former Staff
3/10/1997 Leaking Underground Storage Tank Corrective Action Underway Workplan submitted by consultant for work in 1997. Former Staff
11/5/1997 Update or Other Action Paul Pinard sent a letter following up after a meeting on October 22, 1997. Alyce Hughey
11/11/1997 Update or Other Action Krieber sent correspondence to RP and consultant, advising that he is the new PM. Former Staff
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TESORO NORTHSTORE Former Staff
1/26/1998 Long Term Monitoring Established Consultant submitted monitoring report for Sept 97 event. Former Staff
2/17/1998 Leaking Underground Storage Tank Corrective Action Underway Consultant submitted workplan for action at this site in 1998. Former Staff
3/11/1998 Update or Other Action Dept completed review and responded to monitoring report and proposed workplan. Noted that benzene contamination exceeds DW MCL and asked for report on Dec 97 monitoring event. Had concerns/comments on the proposed workplan that needed to be addressed before an approval could be issued. Former Staff
5/18/1998 Update or Other Action Dept completed review of SVE Pilot test and sent ltr to consultant. Blower plans were not provided and other issues in March 11,98 ltr were not addressed. Reminded consultant that 1998 workplan was not yet approved. Former Staff
7/2/1998 Update or Other Action Paul Pinard sent a letter of review after reviewing the December 1997 and March 1998 Monitoring Events from Gilfilian Engineering, dated June 11, 1998. Alyce Hughey
8/17/1998 Update or Other Action Paul Pinard sent a review with comments letter after reviewing the June 1998 Monitoring Event from Gilfilian Engineering, dated July 10, 1998. Alyce Hughey
12/28/1998 Update or Other Action Paul Pinard sent a review with comments letter after reviewing the October 1998 Monitoring Event, from Gilfilian Engineering, dated December 14, 1998. Alyce Hughey
2/2/1999 Update or Other Action Paul Pinard sent a letter addressing his concerns after attending the ADEC/Tesoro meeting on December 16, 1998. Alyce Hughey
4/6/1999 Update or Other Action Paul Pinard sent a letter of review after reviewing the 1998 Annual Monitoring Event Report from Gilfilian Engineering, dated February 16, 1999. Alyce Hughey
5/3/1999 Update or Other Action Paul Pinard sent a letter after reviewing the Well Search Report from Gilfilian Engineering, dated March 16, 1999. Alyce Hughey
5/10/1999 Update or Other Action Paul Pinard sent a letter approving the proposed blower for the Soil Vapor Extraction System. Alyce Hughey
5/14/1999 Update or Other Action Robert Weimer for Paul Pinard sent an approval letter for the proposed 1999 workplan after receiving a response to issues addressed in the April 8, 1999 letter. Alyce Hughey
7/28/1999 Update or Other Action Paul Pinard sent a letter after reviewing the May 1999 Monitoring Event, from Gilfilian Engineering, dated July 6, 1999. Alyce Hughey
1/9/2001 Update or Other Action Brief review of October 2000 GW report submitted by GE2T. (JBC) John Carnahan
1/14/2004 Leaking Underground Storage Tank Corrective Action Underway Approval for 2004 Work Plan. Monica English
11/2/2004 Document, Report, or Work plan Review - other April 2004 Monitoring Event report. GW contaminant trend similar to previous sampling event. All sampled wells met GCL. However, this is the first time monitor well G5 has met the GCL for benzene. Will continue to monitor. Monica English
11/15/2004 Update or Other Action Staff attends annual environmental planning meeting with Tesoro and MWH to discuss proposed work plan for 2005. Monica English
11/19/2004 Update or Other Action File number 2100.26.086 assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
2/18/2005 Update or Other Action ADEC issues conditional approval for the 2005 calendar year Corrective Action plan. Monica English
7/19/2005 Update or Other Action ADEC staff provided approval for hauling contaminated soils (if encourntered) to Alaska Soil Recycling during the tank removal and replacement activities expected to occur this week. Monica English
11/15/2005 Update or Other Action Annual Environmental Planning meeting attended by ADEC, Tesoro and MWH. Monica English
11/17/2005 Update or Other Action Approval issued for the calendar year 2006 work plan. Continued ground water monitoring will be conducted to track migration and trends of contaminants present. The on-site treatment system (SVE) will continue to be operated and maintained. Three additional monitor wells will be installed downgradient of the former tank system to replace damaged/destroyed wells. Monica English
7/5/2006 Update or Other Action Monica English sent an approval letter for the Supplemental Work Plan for Groundwater Monitoring Well Installation Plan from Montgomery Watson Harza, dated May 18, 2006 Alyce Hughey
10/9/2006 Update or Other Action Project manager changed from Monica English to Paul Horwath, per Paul Horwath. Alyce Hughey
12/5/2006 Update or Other Action Using Figure 1 from the April 2005 Monitoring Event Report, from Montgomery Watson Harza, dated July 2005, in conjunction with Anchorage Live, Recorders Office, and TopoZone Pro, entered the coordinates for this site. Metadata includes No Topo Basemap, Black and White Aerial Photo, TopoZone Pro Street Maps, on a Medium Size Map, View Scale 1:9,840, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
2/14/2007 Document, Report, or Work plan Review - other Reviewed MWH's Tesoro 2 Go Mart #14 October/November 2006 Confirmation Soil Boring/Monitoring Event Report Final, dated February 2007. Report covered the installation of 3 now GW monitoring wells, and the sampling of the site monitoring wells. No contamination was detected in any of the soil or water samples. An SVE system continues to operate at this site. Long-term groundwater monitoring continues. Th only contamination remaining at this site is directly under the existing UST systems, concrete pad, and canopy. Paul Horwath
12/5/2007 Document, Report, or Work plan Review - other Reviewed MWH's April 20067 Monitoring Event Report Final, dated July 2007. Also reviewed Anne Wilkinson's July 16th, 2007 cover letter. No grounwater contamination detected, same as the prior monitoring event report. Soil contamination remains in a layer of peaty soil in the vicinity of the former UST tanks. SVE treatment system continues in operation. Paul Horwath
2/21/2008 Exposure Tracking Model Ranking Initial ETM ranking completed. Paul Horwath
4/29/2008 Document, Report, or Work plan Review - other Reviewed MWH's October 2007 Monitoring Event Report Final report, dated March 2008. An SVE treatment system continues to be operated at this site. GW contamination was not detected in the MWs sampled, but may remain onsite where the USTs are located. GW contamination is not migrating any significant distance - even onsite. Declining contaminant concentration trend has been established. Paul Horwath
9/25/2008 Document, Report, or Work plan Review - other Reviewed the April 2008 Monitoring Event Report, Dated July 2008, from MWH for Paul Horwath, and provided a summary of the report for his review. Groundwater concentrations remaine un-detect for GRO, DRO, and BTEX in all the groundwater monitoring wells sampled. Site conditions remain stable, and a request for conditional site closure is planned to be submitted to ADEC for approval from MWH some time in 2008. Alyce Hughey
11/13/2008 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77906 UST Systems. Alyce Hughey
4/23/2009 Cleanup Complete Determination Issued A cleanup complete determination letter, dated April 23, 2009, was issued. Paul Horwath
4/23/2009 Long Term Monitoring Complete Administrative action on 5/1/2013. Kristin Thompson
8/28/2009 Document, Report, or Work plan Review - other Reviewed the Monitoring Well/Remediation System Decommissioning Report, dated July 29, 2009, from MWH for Paul Horwath. The remaining eight monitoring wells, G-4, G-7, G-8, G-9, G-10, G-11, G-12, and G-13, along with the SVE system and piping were decommissioned on June 2, 2009 according to the ADEC guidelines. Alyce Hughey

Contaminant Information

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

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

No associated sites were found.

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
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