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Site Report: Tesoro - Northstore #54

Site Name: Tesoro - Northstore #54
Address: Mile 90 Seward Highway, Girdwood, AK 99587
File Number: 2110.26.001
Hazard ID: 23205
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 60.940500
Longitude: -149.172000
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 the removal and upgrade of two 8,000 gallon gasoline, one 6,000 gallon diesel underground storage tanks, and the upgrade of the strip mall, soil and groundwater contamination was encountered and expected due to a January 20, 1998 reported incident where fuel leaked. Approximately 341.86 tons of contaminated soils was excavated and thermally remediated at Anchorage Soil Recycling. A soil vapor extraction system was installed and utaliized as a form of remediation. The new tank installed was one multipile compartment 26,000 gallon unleaded gasoline and diesel UST. The tank was removed in April of 2005, and two 20,000 gallon UST's was installed. Long term monitoring has been established. Updated 12-7-06 Alyce Hughey.

Action Information

Action Date Action Description DEC Staff
5/12/1998 Update or Other Action Paul Pinard sent a letter of response after reviewing the May 1, 1998 report from Gilfilian Engineering. Alyce Hughey
6/17/1998 Update or Other Action Eileen Olson sent an approval letter for Jim Frechione to transport and thermally remediate approximately 6 cubic yards of contaminated soil. Alyce Hughey
2/9/1999 Update or Other Action Paul Pinard sent an approval letter for the proposed 1999 Workplan from Gilfilian Engineering, dated December 14, 1998. Alyce Hughey
4/13/1999 Update or Other Action Paul Pinard sent an approval letter approving the installation of 5 propose monitoring wells. Alyce Hughey
4/20/1999 Underground Storage Tank Site Characterization or Assessment Paul Pinard sent a letter with comments after reviewing the Site Assessment of UST System Closure and Site Improvements, from Gilfilian Engineering, dated January 6, 1999. Alyce Hughey
5/24/1999 Update or Other Action Paul Pinard sent an approval letter to transport and treat the drummed soils from MW-2 to Anchorage Soils Recycling. Alyce Hughey
9/30/1999 Release Investigation Paul Pinard sent a letter with comments after reviewing the Phase I Release Investigation and April 1999 Groundwater Monitoring Event from Gilfilian Engineering, dated July 8, 1999 Alyce Hughey
12/14/1999 Update or Other Action Paul Pinard sent a letter with comments after reviewing the July 1999 Groundwater Monitoring Event, from Gilfilian Engineering, dated August 23, 1999. Alyce Hughey
12/21/1999 Update or Other Action Paul Pinard sent an approval letter for the proposed Soil Vapor Extraction System, based on the Pilot Study done in July of 1999. Alyce Hughey
1/7/2000 Underground Storage Tank Site Characterization or Assessment JBC Former Staff
1/7/2000 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 76071 (Added by System) Former Staff
1/7/2000 Leaking Underground Storage Tank Cleanup Initiated - Petroleum JBC Former Staff
1/7/2000 Site Added to Database Former Staff
3/10/2000 Release Investigation John Carnahan sent a letter with comments after reviewing the Workplan for Release Investigation and Corrective Action, dated February 28, 2000. Alyce Hughey
8/21/2002 Update or Other Action RECKEY has automatically been generated. Cynthia Pring-Ham
1/14/2004 Leaking Underground Storage Tank Corrective Action Underway Approval of 2004 Work plan. Monica English
10/8/2004 Underground Storage Tank Site Characterization or Assessment Approval of Additional Site Characterization Work Plan. Includes the installation of two additional monitor wells to better track GW contamination. Monica English
11/4/2004 Document, Report, or Work plan Review - other January 2004 Monitoring Event report. All monitor wells sampled met GCL. However, several wells will require continued monitoring because previous sampling indicated an exceedance of benzene, GRO and/or DRO. A previously installed horizontal SVE system has been operating. Monica English
11/15/2004 Update or Other Action Staff attends annual environmental planning meeting with Tesoro & MWH to discuss proposed work plan for 2005. Monica English
11/19/2004 Update or Other Action File number 2110.26.001 assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
1/25/2005 Update or Other Action ADEC approval for the 2005 calendar year Corrective Action work plan. Monica English
11/22/2005 Leaking Underground Storage Tank Corrective Action Underway Monica English sent an approval letter for the proposed Corrective Action Work Plan for 2006. Alyce Hughey
10/9/2006 Update or Other Action Project manager changed from Monica English to Paul Horwath, per Paul Horwath. Alyce Hughey
12/8/2006 Update or Other Action Using Figure 1 from the April 2006 Monitoring Event, Tesoro Northstore #54, from Montgomery Watson Harza, dated August 2006, in conjunction with TopoZone Pro, and the Recorders Office, 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
12/13/2006 Conditional Closure Approved Phorwath issues a December 13, 2006 conditional closure decision letter. Conditions of closure include prohibition of water well installation without prior ADEC approval, ADEC must be contacted if residual soil or groundwater contamination is exposed due to future site work and additional site assessment or cleanup may be required at that time, long-term annual groundwater monitoring from MW-8, and the decommissioning of the remaining GW monitoring wells. Paul Horwath
12/13/2006 Long Term Monitoring Established Annual long-term groundwater monitoring required at MW-8. Phorwath. Paul Horwath
12/13/2006 Institutional Control Record Established This data base entry will serve as an institutional control to document that residual soil and groundwater contamination remains at this site at concentrations exceeding the most stringent 18 AAC 75.341 soil 'Migration to Groundwater' cleanup levels and the 18 AAC 75.345(Table C) groundwater cleanup levels. Paul Horwath
2/12/2007 Document, Report, or Work plan Review - other Phorwath reviewed MWH's Tesoro 2 Go Mart #54 October 2006 Monitoring Event Report Final, dated February, 2007. Three GW monitoring wells were sampled. Residual BTEX, GRO, and DRO was detected but no groundwater cleanup levels were exceeded in any of the three wells. Only GW MW-8 is required to be preserved for future annual long-term GW monitoring. Paul Horwath
2/13/2007 Update or Other Action Enter this site into ADEC's Institutional Control Tracking Module database. Phorwath. Paul Horwath
4/17/2008 Document, Report, or Work plan Review - other Reviewed MWH's Tesoro 2 Go Mart #54 February 26, 2008, Monitoring Wells Decommissioning. All monitoring and treatment wells were decommissioned with the exception of MW-1, which will continue to be periodically sampled in order to monitor long term groundwater quality, in accordance with the conditions of the site closure determination. Paul Horwath
10/1/2008 Document, Report, or Work plan Review - other Reviewed the May 2007 Drinking Water Well Monitoring Report, dated June 2008, from MWH and provided Paul Horwath a summary for his review. Based on the May 2, 2007 drinking water sample, no DRO, GRO, and BTEX groundwater contamination was encountered during this monitoring event. Site conditions remain stable. Alyce Hughey
10/2/2008 Document, Report, or Work plan Review - other Reviewed the April 2008 Monitoring Event Report, dated July 2008, from MWH, for Paul Horwath and prepared a summary of the report for his review and oversite. Benzene, Ethylbenzene, DRO and GRO was detected in the groundwater sample taken, but were below the ADEC groundwater cleanup levels. Alyce Hughey
7/30/2009 Document, Report, or Work plan Review - other Reviewed the April 2009 Monitoring Event Report, dated June 2009, from MWH for Paul Horwath and prepared a summary for his review and oversight. Site conditions are stable with only GRO and DRO being detected below the groundwater cleanup levels in the one well tested SVE-1/MW. The on-site drinking water source continues to test non-detect for all analytes tested for. Continued monitoring of the one remaining well, SVE-1/MW and the on-site drinking water source is needed in order to confirm the absence of contaminants in the groundwater and in the stations drinking water source. Alyce Hughey
12/11/2009 Long Term Monitoring Complete Issued letter for ADEC Removal of Long-Term Groundwater Monitoring Requirement. Upon review of the groundwater quality data collected at this site since issuance of our December 13, 2006 ADEC Record of Decision, we have determined that long-term groundwater monitoring is no longer necessary. Condition number 3 in ADEC's December 13, 2006 ADEC Record of Decision - Conditional Closure Determination is hereby removed, meaning that further groundwater monitoring and sampling is no longer required at this site. The status of this site will remain "Cleanup Complete with Institutional Controls" on the ADEC database. An institutional control will remain on the ADEC database to document residual contamination potentially remaining at the site. A site closure without conditions could be considered when soil and groundwater samples confirm that all soil and groundwater meet the established ADEC soil and groundwater cleanup levels for this site. Paul Horwath
8/19/2010 Document, Report, or Work plan Review - other Reviewed the Monitoring Wells Decommissioning Report, dated July 14, 2010, from MWH for Paul Horwath, and the one remaining Monitoring Well SVE-1/MW was decommissioned according the ADEC Monitoring Well Guidance, dated February 2009, as recommended in the ADEC decision letter dated December 11, 2009. Alyce Hughey
9/9/2010 Document, Report, or Work plan Review - other Reviewed the Release Investigation Letter Report, dated August 30, 2010, fromm MWH. On July 17, 2010 approximately 15 gallons of gasoline fuel was released from a boat being towed by a customer’s truck onto the pavement that migrated downhill and into soil near the western entrance to the site. Approximately 50 gallons of contaminated soil was excavated in an area of 4.5 by 1.8 by 1.8 feet and transported to Alaska Soil Recyclers for thermal remediation. Two soil samples were taken at 1.7 feet below ground surface, and soil samples did not detect GRO or BTEX above the soil cleanup levels. Alyce Hughey
11/10/2014 Update or Other Action Staff changed from Paul Horwath to IC Unit. Kristin Thompson
7/20/2015 Institutional Control Compliance Review IC compliance review conducted. Groundwater monitoring was removed from the IC requirements since the remaining well was decommissioned in 2010. Schedule to send an IC reminder letter. Evonne Reese
2/19/2016 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Reminder system set to follow-up in 2021. Kristin Thompson
6/5/2017 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. Kristin Thompson
8/21/2024 Institutional Control Compliance Review IC compliance review completed on this date. An IC reminder letter was issued to the landowner. The next review will be in three years’ time. Gaige Robinson

Contaminant Information

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

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP

Requirements

Description Details
Groundwater Use Restrictions The installation of groundwater wells is prohibited on this property without the prior approval of ADEC. Any exception to this prohibition must be reviewed and approved by ADEC.
Other Should future site work expose residual soil or groundwater contamination, ADEC must be contacted and additional assessment or cleanup may be required at that time.
Advance approval required to transport soil or groundwater off-site. Standard condition.
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.
Periodic Review Every three years.

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
TDD: 800-770-8973
Physical Location: 410 Willoughby