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Site Report: ARRC Upper Trail Lake


Site Name: ARRC Upper Trail Lake
Address: Moose Pass - Near Upper Trail Lake, Moose Pass, AK 99631
File Number: 2322.38.006
Hazard ID: 1285
Status: Cleanup Complete
Staff: ,
Latitude: 60.486066
Longitude: -149.366742
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

In 1991, 9 cubic yards of petroleum impacted soil was stockpiled on site during the removal of a 500 gallon HOT. A soil sample collected 12 to 18 inches into the stockpile contained benzene up to 0.041 mg/kg and TPH up to 6,370 mg/kg. Confirmation soil samples collected from the depth of the excavation, at 11 ft. bgs, contained benzene up to 0.075 mg/kg and DRO up to 6490 mg/kg. A PVC gallery was installed and the excavation was backfilled. Extent of contamination is unknown. Spill located in Moose Pass next to Upper Trail Lake, which has a salmon hatchery. The Moose Pass Section has been decommissioned and only a tool storage shed remains. Note: in addition to the 500 gallon HOT, a regulated 2,000 gallon gas UST was closed in place at the former Moose Pass Section House as well.

Action Information

Action Date Action Description DEC Staff
10/3/1991 Update or Other Action Approximately 9 cubic yards of contaminated soil stockpiled on site during and 500 gallon heating oil tank excavation. The Moose Pass Section has been decomisioned and only a tool storage shed remains. Analytical data taken at depths of excavation indicated contamination above ADEC cleanup levels with benzene up to 0.075 mg/kg and extractable petroleum hydrocarbon (EPH) up to 6490 mg/kg. Grant Lidren
1/1/1993 Update or Other Action On this date, ADEC received ARRC Final Report 1992 Activities UST removals and Site Characterization…In-Place Closure and Site Characterization, Moose pass, submitted by ENSR and dated January 1993. On August 12, 1992 a 2,000 gallon regulated gas UST was emptied of contents, filled with sand/cement slurry, and closed in place at the former section house. Field screened soil from a test trench excavated on the west end of the tank did not indicate contamination. GW was encountered at 7 ft. bgs. A soil sample and duplicate collected 8 ft. bgs(1 foot below the tank) were non detect. This tank is listed on the UST Database as the Facility: #1184 Alaska Railroad Corporation (arrc) - Moose Pass Section. Grant Lidren
4/14/2004 Update or Other Action File number assigned and entered into the Fileroom DB and CS DB. Alyce Hughey
8/2/2005 Update or Other Action File sent to Anchorage from Soldotna. Alyce Hughey
3/28/2007 Exposure Tracking Model Ranking Initial ranking Bill O'Connell
12/28/2009 Update or Other Action More low potential pathways were added to the updated ETM ranking. This site is located in the town of Moose Pass, next to Upper Trail Lake. Grant Lidren
6/11/2010 Report or Workplan Review - Other On this date, ADEC received the Work Plan for Soil Borings and Sampling Moose Pass Rail Yard, submitted by Clarus and dated April 2010. Three soil borings will be advanced at the former UST location. Two soil samples will be collected from each boring at 5 foot intervals down to 20 ft. bgs. The soil samples will be collected from the groundwater interface and/or from the highest field screen result. The soil samples will be analyzed for GRO, DRO, and BTEX. A total of seven soil samples will be analyzed, which includes the duplicate. Grant Lidren
12/9/2010 Report or Workplan Review - Other On this date, ADEC received Phase II Soil Investigation Moose Pass Rail Yard, submitted be Clarus dated August 30, 2010. Three soil borings were advanced at the former UST location. Groundwater was encountered at 7 to 8.5 feet bgs. Two soil samples were collected: one from the vadose zone, and one from the groundwater interface; from each boring at depths from 4 to 8 feet bgs. A total of seven soil samples (including the duplicate) analyzed for GRO, DRO, and BTEX did not contain detectable levels of contaminants. Grant Lidren
1/5/2011 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed review of the environmental records associated with the ARRC Upper Trail Lake. Based on the information provided to date, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment, and this site will be closed. This decision is based on the administrative record which is located in the offices of the ADEC in Anchorage, Alaska. Grant Lidren
8/7/2015 Update or Other Action This file has been archived at Alaska Archives Barcode: 896980 Box 414 Susan Carberry

Contaminant Information

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

Missing Location Data

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