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Site Report: United Tool Rental

Site Name: United Tool Rental
Address: 9760 Old Seward Highway, Anchorage, AK 99515
File Number: 2100.38.479
Hazard ID: 425
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.132716
Longitude: -149.868862
Horizontal Datum:WGS84

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

Petroleum contaminated soil from UST excavations at three regulated LUST sites was transported to this site for disposal with full knowledge and approval of landowners. The site preparation and monitoring plan were conducted prior to promulgation of 18 AAC 78. The Unocal S/S 4581 and 4652 are STP sites assigned to Weimer. The third excavation site, Unocal 6401, located at Northern Lights and Seward Highway, is not found thus far as a LUST site. Tract B, Mindoro Subdivision. The elevation is ~40 meters (~131 feet). Formerly Stephan's Tool Rental and Sales, Inc. bought out by United Tool Rental. Confirmation soil samples were collected to demonstrate levels of contamination in the treatment cell, and the underlying and adjacent soils met cleanup levels.

Action Information

Action Date Action Description DEC Staff
1/4/2002 Site Added to Database Petroleum impacted soil landspreadijng. Bruce Wanstall
1/4/2002 Site Ranked Using the AHRM Preliminary ranking based on original condition of soils at beginning of landspreading in 1988. Bruce Wanstall
2/4/2002 Site Ranked Using the AHRM Site reranked. Elizabeth Stergiou
3/18/2004 Meeting or Teleconference Held Meeting with Unocal. Unocal will look for any site info since 1995. Robert Weimer
5/27/2005 Meeting or Teleconference Held Discussions with Unocal on the status of the soils at the Stephan's Tool Rental (now United Tool Rental) site. Unocal could not find the soils, and the current owner has no knowledge of it. Unocal will check with past owners/operators and submit a plan to assessing the area where the cell used to be. Robert Weimer
10/17/2005 Update or Other Action Unocal to find information and submit a plan for confirmation soil sampling of the area. Robert Weimer
1/5/2007 Update or Other Action File number issued 2100.38.479. Aggie Blandford
4/2/2007 Meeting or Teleconference Held Meeting with RP to discuss site. They are to locate Stephan's Tools property soils, to submit a revised confirmation sampling workplan, and information regarding status of cold asphalt at the site. Robert Weimer
3/5/2008 Meeting or Teleconference Held Meeting with Chevron and their consultants. They do follow up work to locate and assess the soils that went to Stephan's Tool Rental in 1988. Robert Weimer
6/5/2008 Site Visit Site visit with UNOCAL/Chevron's consultant (CRA) to observe the condition of the soil treatment cell and to conduct confirmation sampling. Confirmation sampling was not done at this time because of changes in site conditions. The soil treatment cell had been graded and spread over a larger area, there may have been fill placed over portions, there were trailers and equipment were parked on portions of the treatment cell area, and there were some visibly stained soil in the cell area some of which was under the stored equipment. There were also some visibly stained soil under some equipment stored to the east of the treatment cell area. CRA said they would talk with the property owner and Chevron about what they observed. Robert Weimer
6/24/2008 Exposure Tracking Model Ranking Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Robert Weimer
2/25/2009 Meeting or Teleconference Held Meeting with Chevron and their consultants. They do follow up work in 2009 to assess and cleanup the soils that went to Stephan's Tool Rental in 1988. Robert Weimer
3/11/2010 Meeting or Teleconference Held Meeting with Chevron and their consultants on 3/10/10. We discussed that assessment work still needs to be done at the Stephan's Tool site, the owner of the property also participated in the meeting. We discussed that PAH would be required in 10% of the soil samples. Robert Weimer
7/6/2010 Meeting or Teleconference Held Discussed the proposed Strategic Site Assessment workplan with the Responsible Parties Consultant (CRA). The plan proposes to do multi-increment (MI) sampling of the former treatments cell area and analyze for BTEX, GRO, and DRO. We discussed that MI sample can not be used at this site because the extent of the contamiantion has not been defined and their are stained areas in the former cell area. We also discussed that becaused UNOCAL used oil soils were placed in the cell the confirmation sampling needs to also include solvents, PCBs, metals, and 10% PAH, EDB, and 1,2-DCA at the highest locations. We discussed that the visibly stained areas would need to be removed, segregated, characterized with analytical samples, and treated/disposed of in an approved manner. We discussed that a workplan simular to the previously approved June 3, 2008 workplan should be submitted for the assessment of the other soils. CRA will submit copies of the past aerial photos of the site. Robert Weimer
9/28/2010 Document, Report, or Work plan Review - other Discussed the proposed Soil Investigation and Management workplan with the Responsible Parties Consultant (CRA). The plan proposes to do field screening with Petroflag and to collect analytical samples (as an unknown contaminant) at locations where field readings exceed 250 ppm. They will provide a revised plan that includes collecting at least 50 field screening readings and 5 analytical samples of the cell soils, at least 73 field screening locations and 5 analytical samples of the soils under the liner (or 1.5 feet if there is not liner), and at least 42 field screening locations with one analytical per side around the cell just below the liner (or 1.5 feet if there is not liner). They will also initially dig at least 10 test pits to 3 feet below ground surface to verify that the cell soils are not at a greater depth than 1.5 feet. Robert Weimer
10/7/2010 Update or Other Action Chevron's consultant (CRA) contacted DEC to see if they could help facilitate getting a site access agreement so they can conduct the necessary site work. DEC contacted property owner. Robert Weimer
10/19/2010 Site Characterization Workplan Approved DEC conditionally approves revised Soil Investigation and Management Workplan to assess the 1988 soil treatment cell and area. Robert Weimer
9/13/2011 Site Visit Site visit to observe confirmation sampling of landfarm area. They marked off the area based on the air photos and had begun to dig test pits. Intact liner areas were visible at several locations. Robert Weimer
9/14/2011 Site Visit Site visit to observe confirmation sampling of landfarm area. Several locations had visibly stained soil at the surface. Intact liners were found at almost every test pit location except for the far west end and north edge. Discussed with consultant that all stained soil in the assessment area would need to be excavated and put in a drum for future characterization and treatment. Also that at least 1 cell confirmation sample is to be collected in each area that stained soil was removed. Need field screening of sidewalls and base of each stained soil location to determine where to take the confirmation sample. There was also one pit with tar like flowing liquid that will need to handled just like the stained soil locations. Discussed that perimeter samples need to be outside of the lined area and at the depth no more than 12 inches above the level of the liner. Robert Weimer
10/11/2011 Document, Report, or Work plan Review - other Based on the information provided on October 7th through October 11th DEC has no objection to spreading the non surface stained excavated soil within the former treatment cell area. DEC requests a corrective action plan by October 30, 2011 for the excavated surface stained soil. Robert Weimer
10/17/2011 Update or Other Action DEC approves request to transport 8 drums of surface stained contamianted soil, 4 drums of contamianted test pit water, 2 drums of decon water, and 1 drum of petroflag waste to the secure yard at 1441 C Street. Robert Weimer
11/4/2011 Document, Report, or Work plan Review - other ADEC approves treatment of 6 drums of contaminated water collected from the test pits during the treatment cell assessment work in September 2011. Robert Weimer
11/9/2011 Meeting or Teleconference Held Meeting with CRA to discuss proposed corrective action plan. They will provide a revised work plan based on the comments. Add analytical at highest sidewall, identify locations to be excavated, and DRO/RRO the only analytical. Robert Weimer
11/10/2011 Document, Report, or Work plan Review - other ADEC approves thermal treatment of 8 drums of contaminated soil collected from the surface stained areas excavated during the treatment cell assessment work in September 2011. The approval also covers the thermal treatment of additional contaminated soil that is to be excavated the week of November 20th from the two surface stained locations that still exceed cleanup levels for DRO and RRO. Robert Weimer
11/16/2011 Document, Report, or Work plan Review - other Review and approve revised corrective action plan. Added analytical at highest sidewall, identify locations to be excavated, and DRO/RRO the only analytical. They also need to add one duplicate sample. Robert Weimer
11/21/2011 Document, Report, or Work plan Review - other ADEC approves transport of 6 drums of contaminated water collected from the test pits during the treatment cell assessment work in September 2011 to the secure yard at 1441 C Street. Robert Weimer
2/29/2012 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/28/12. DEC is to review the February 2012 report for the sampling of the landfarm soils at the Stephan's (United) Tool Rental property. Robert Weimer
10/8/2012 Document, Report, or Work plan Review - other Review of Soil Cell Assessment Report for the September 2011 sampling of the soil treatment cell at the 9760 Old Seward property. The cell contained contaminated soil from several Unocal sites. Two visibly stained areas were sampled had up to 4,000 mg/kg DRO and 12,000 mg/kg RRO. The contaminated soil from these locations was excavated and thermally treated. Confirmation soil samples were collected from within the cell, under the cell liner, and around the perimeter of the cell. Up to 120 mg/kg DRO, 1,600 mg/kg RRO, background metals concentrations, non-detect PCBs, non-detect HVOCs, low concentrations of PAHs, and 0.006 mg/kg benzene in the soil samples collected. Robert Weimer
6/12/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 71404 Unocal soil cell contamination. Robert Weimer
9/7/2016 Update or Other Action On July 1, 2013 a closure letter was issued for the soils in the treatment cell. See file 2100.26.114. Robert Weimer
12/14/2016 Cleanup Complete Determination Issued Confirmation soil samples were collected to demonstrate levels of contamination in the treatment cell, and the underlying and adjacent soils met cleanup levels. Robert Weimer

Contaminant Information

Name Level Description Media Comments
Lead - Total < Method 2 Most Stringent Soil
Benzene < Method 2 Most Stringent Soil
GRO < Method 2 Most Stringent Soil
PAHs - Total < Method 2 Most Stringent Soil
DRO < Method 2 Most Stringent Soil
RRO < 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.
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)
Hazard ID Site Name File Number
23364 Unocal - #4581(former) 2100.26.114
23360 Unocal - #4652 (former) Chevron 306448 2100.26.117

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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