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Site Report: Tesoro - Northstore #2

Site Name: Tesoro - Northstore #2
Address: 4608 Spenard Rd, Anchorage, AK 99517
File Number: 2100.26.074
Hazard ID: 23391
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.179130
Longitude: -149.939491
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 upgrade activities for two 10,000-gallon gasoline and one 5,000-gallon diesel UST, DRO and benzene contamination exceeding cleanup levels was encountered in soils. A subsequent release investigation installed three monitor wells to determine water quality at the site. Over a period of six years no detectable levels of contaminants were found in any of the 4 monitor wells.

Action Information

Action Date Action Description DEC Staff
7/20/1995 Site Added to Database Former Staff
7/20/1995 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 76203 ADD; Site added to database. Former Staff
7/21/1995 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; LUST corrective action underway. : LCAU date changed DB conversion Former Staff
9/25/1995 Release Investigation RELR; Reviewed release investigation. Former Staff
10/12/1995 Underground Storage Tank Site Characterization or Assessment SA1A; Reviewed a phase 1 site assessment. 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
3/10/1998 Update or Other Action Dept completed review and responded to Workplan, submitted by consultant on 2/17/98 , for work on this site in 1998. It called for proceeding with a formal "risk assessment" once a workplan for it has been approved by the Dept. That workplan is currently Paul Pinard
8/5/1998 Underground Storage Tank Site Characterization or Assessment Colin Basye sent a review comments letter after reviewing the Risk Assessment work plan from Gilfilian Engineering, dated February 13, 1998. Alyce Hughey
2/2/1999 Update or Other Action Paul Pinard sent an approval letter for the 1999 Workplan from Gilfilian Engineering, dated December 14, 1998. Alyce Hughey
6/16/1999 Institutional Control Record Established Former Staff
6/16/1999 Conditional Closure Approved A conditional NFRAP letter was issued by Paul Pinard contingent upon Tesoro conducting annual graoundwater monitoring each Spring for a minimum of 3 years. Monica English
11/18/1999 Update or Other Action Paul Pinard sent a review letter after reviewing the July 1999 Groundwater Monitoring Event. Alyce Hughey
11/18/2004 Update or Other Action File number 2100.26.074 assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
11/10/2005 Update or Other Action File review indicates that the final groundwater monitoring event as stipulated in the conditional NFRAP determination has yet to be conducted. However, groundwater monitoring conduted from May 1995 until May 2001 had non detectable levels for all contaminants of concern. Monica English
11/20/2006 Update or Other Action Using Figure 1 from the May 2000 Groundwater Monitoring Event, from Gilfilian Engineering, dated June 13, 2000, in conjunction with TopoZone Pro and the Anchorage Live Map, 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
7/25/2013 Underground Storage Tank Site Characterization or Assessment Reviewed the May 2013 UST Closure Site Assessment Report, dated July 2013, prepared by MWH. On May 1 through May 4, 2013 two 10,000-gallon gasoline, one 5,000-gallon diesel underground storage tanks, associated piping, three dispenser islands and one overhead canopy were removed and replaced with two multi-compartment 12,000-gallon fiberglass underground storage tanks, associated piping, two dispenser island and overhead canopy. Four stockpiles were generated during the removals; Stockpile 1 consisted of approximately 150 cubic yards from the 2-gasoline tanks which had little indication of impact, Stockpile 2 consisted of approximately 50 cubic yards, Stockpile 3 consisted of approximately 40 cubic yards of soil of which were taken directly beneath the dispensers and pump islands with contamination impacts, and Stockpile 4 consisting of approximately 200 cubic yards of soil from the over excavation to accommodate the installation of the two new tanks, with no indication of impact. Confirmation soil samples collected had DRO, GRO, BTEX, PAH’s, and Lead detected at 10 to 10.5 feet below ground surface (extent of excavation) at concentrations below the soil cleanup levels. Soils were also analyzed for Ethylene Dibromide (EDB), 1,2-Dichloroethane (1,2-DCA) and Methyl tert-butyl ether (MTBE), with all sample results of non-detect. Benzene and DRO was detected above the soil cleanup levels at concentrations of 0.112 and 0.179 mg/kg Benzene and 328 and 716 mg/kg DRO within stockpiles 2 and 3, which were transported off site for thermal remediation and disposal (approximately 126 tons). Stockpiles 1 and 4 were returned to the excavation as backfill. Groundwater was not encountered during the USTs removals, and historical records indicate that groundwater was typically found at 14.5 to 17.5 feet below ground surface. The site and surrounding properties are serviced by the Anchorage municipal drinking water supply. Alyce Hughey
7/29/2013 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 76203 name: autogenerated pm edit - Tesoro - Northstore #2 Alyce Hughey
7/30/2013 Update or Other Action Received confirmation from MWH that the monitoring wells had been decommissioned per ADEC well decommissioning procedures through an e-mail communication from Kris Ivarson to John Carnahan, dated November 12, 2001. Alyce Hughey
7/30/2013 Meeting or Teleconference Held Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss the decommissioning of the groundwater monitoring wells, UST removals and site closure. Alyce Hughey
8/1/2013 Institutional Control Record Removed Additional soil cleanup work completed in 2013 at the time of UST system replacements negates the need for any continuing institutional control at this site. A corrective action complete decision letter was issued today without any conditions or institutional controls. Paul Horwath

Contaminant Information

Name Level Description Media Comments
DRO < Method 2 Most Stringent Soil
Benzene < Method 2 Most Stringent 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
TDD: 800-770-8973
Physical Location: 410 Willoughby