Site Report: ADOT&PF Thompson Pass Maint. Stn.
| Site Name: | ADOT&PF Thompson Pass Maint. Stn. |
|---|---|
| Address: | Mile 27 Richardson Hwy., Valdez, AK 99686 |
| File Number: | 2264.38.014 |
| Hazard ID: | 675 |
| Status: | Active |
| Staff: | Michael Hooper, 9074515174 michael.hooper@alaska.gov |
| Latitude: | 61.140981 |
| Longitude: | -145.749292 |
| Horizontal Datum: | WGS84 |
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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
The Alaska Department of Transportation (ADOT) facility rests on a gravel pad with an abrupt slope, which is adjacent to a creek. The site historically consisted of: two 6,000-gallon diesel above ground storage tanks (ASTs), one 10,000-gallon diesel AST, a gas underground storage tank (UST), and a waste oil UST. The ASTs have a history of spills including a 7,000-gallon diesel spill in 1989 and a 1,200-gallon spill in 1990. On July 21, 1993, 50 small test pits were dug to determine the lateral extent of contaminant migration. A total of 13 soil samples, a surface water sample from a natural spring, and a water sample from the onsite drinking water well, were analyzed for petroleum constituents. The soil samples, which were not analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX), contained diesel range organics (DRO) up to 11,000 milligrams per kilogram (mg/kg). The water samples, which were analyzed for BTEX, were non-detect. Data indicates a total of 3,800 cubic yards of contaminated soil may remain on-site. Groundwater underneath the facility itself was not analyzed. ADEC requests plans for facility modification. According to ADOT&PF (January 2007), all but one of the tanks (buried and above ground), have been removed from the site. The remaining tank is a 10,000-gallon AST which serves both heating and equipment needs. No samples were collected during tank removal activities. Other than the on-site well, there are no wells in the surrounding area.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 2/15/1989 | Site Added to Database | Diesel contamination. | Former Staff |
| 2/16/1989 | Interim Removal Action Approved | (Old R:Base Action Code = REM - Removal / Excavation). Numerous site visits from 2/16 through 2/23/89. Observed cleanup activity. Absorbent pads placed on surface waters and earthen dike completed. Cleanup in regard to 7,000 gallon diesel spill. | Former Staff |
| 3/15/1989 | Notice of Violation | Sent NOVs regarding AS 46.03.710 and AS 46.03.740 for 4/30/90 release. ADEC required written response outlining cleanup action in 30 days from date of letter. | Former Staff |
| 5/1/1990 | Interim Removal Action Approved | (Old R:Base Action Code = REM - Removal / Excavation). State DOT funding. 700 gallons of diesel/water recovered from 1,200 gallon 4/30/90 spill. Mixture taken to Alyeska water treatment facility. Additional 700 gallons diesel/water recovered. Diesel contaminated snow placed in visqueen lined pits. Diesel/water mixture recovered as snow melts. | Former Staff |
| 5/4/1990 | Notice of Violation | Issued to DOT/PF in regards to 4/30/90 spill. Request plans for modification of existing fuel facility. Requested fuel records for past year. | Former Staff |
| 1/5/1991 | Site Number Identifier Changed | Old Reckey 1989240104701. Changed Julian Date per L. Howard of DEC. | Former Staff |
| 4/17/1996 | Preliminary Assessment Approved | (Old R:Base Action Code = SA1A - Phase I Site Assessment Approval). Site Investigation as part of MOA, report dated 10-19-1993 not received until 4-17-96. | Ray Burger |
| 2/24/2004 | Update or Other Action | File number assigned: 2264.38.014. | Sarah Cunningham |
| 11/29/2006 | Update or Other Action | Staff transferred from Pikul to Jaynes. | Aggie Blandford |
| 3/31/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed. | Bill O'Connell |
| 5/16/2014 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 71654 ASTs, USTs. | Joshua Barsis |
| 6/12/2014 | Document, Report, or Work plan Review - other | The ADEC Contaminated Sites Program (CSP) completed its review of the ADOT&PF Thompson Pass Maintenance Station site. In July of 1993, Dames and Moore (D&M) personnel excavated 50 test pits to evaluate impacts from numerous reported and unreported spills. Most of the test pits were excavated between 1.5 and 4 feet below ground surface (bgs); however, a couple of test pits were excavated to groundwater, which was encountered at roughly 5 feet bgs. Each test pit was sampled and field screened using a photoionization detector (PID). A total of 13 soil samples were selected for laboratory anlaysis of diesel range organics (DRO). Most of the soil samples did not exhibit concentrations of DRO above laboratory detection limits. Three of the soil samples exhibited DRO concentrations between 5.6 mg/kg and 11,000 mg/kg. Surface water samples were collected from a down-gradient creek adjacent to the facility, a groundwater seep, and the on-site supply well. The water samples were analyzed for benzene, toluene, ethylbenzene, and xylenes (collectively known as BTEX), which were not detected in any of the water samples. Data gaps exist, and include: (1) the vertical and horizontal extent of contamination has not been defined; and (2) volatiles were not assessed near the gasoline UST and pump station. | Joshua Barsis |
| 11/24/2015 | Update or Other Action | Annual file review. No new information. | Joshua Barsis |
| 10/25/2016 | Update or Other Action | Letter sent on this day with a brief site history and to outline existing data gaps that need to be addressed before this site could be considered for closure. | Joshua Barsis |
Contaminant Information
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Control Type
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Requirements
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There are no documents for this site report.
No associated sites were found.