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Site Report: ARRC - Broad Pass Railroad Station


Site Name: ARRC - Broad Pass Railroad Station
Address: Mile 304.5 Alaska Railrd.; MP 193 Parks Highway, Cantwell, AK 99729
File Number: 150.26.036
Hazard ID: 22938
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 63.235438
Longitude: -149.268617
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

The site consists of a half an acre pad approximately 5-7 feet thick adjacent to the railroad tracks. It is reportedly the former location of a section house and associated facilities. At the time of the assessment in 1993 the land was vacant with the exception of two storage sheds and the UST's. There were two 1,000 gallon diesel tanks located side by side. The fuel was used for the generator that was previously located at the site. The USTs were excavated on September 9, 1993. Soil was removed to a depth of approximately 7 feet below ground surface. Water was encountered at 7 feet bgs, but it is unknown if the water represents shallow groundwater or surface water impoundment beneath the pad. Groundwater has not been sampled. Soil samples collected from the base of the excavation at the water/soil interface show the presence of DRO contamination up to 18,000 mg/kg. Approximately 25-35 cubic yards of soil was excavated and stockpiled onsite. Composite samples collected from the excavation show DRO up to 11,000 mg/kg. A site chacterization peformed in 2007 indicates DRO contamination up to 4,860 mg/kg remains on site. Groundwater was not encountered.

Action Information

Action Date Action Description DEC Staff
9/9/1993 Site Added to Database * Not Assigned
9/9/1993 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77753 ADD; * Not Assigned
10/7/1993 Update or Other Action UST Closure Site Assessment, Broad Pass, Alaska submitted by Shannon & Wilson on this date. Two 1,000 gal diesel USTs were removed. The surface soil surrounding the USTs had a petroleum stain and odor. 25 to 35 cubic yards of contaminated soil was removed during tank excavations. Groundwater with an oily film/emulsion was encountered at 7 ft. bgs, but it was not know whether the water represented groundwater or surface water impoundment beneath the pad. Two soil confirmation samples collected at the depths of the excavation at 7 feet bgs indicated DRO contamination up to 18,000 mg/kg. Prior to backfilling excavation with clean fill, a ventilation gallery was installed. Grant Lidren
10/9/1993 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; LUST corrective action underway. * Not Assigned
5/16/1994 Underground Storage Tank Site Characterization or Assessment SA1R; Documented high levels of contamination at the soil/groundwater interface. * Not Assigned
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
8/4/2005 Update or Other Action File number issued 150.26.036. Aggie Blandford
8/11/2005 Update or Other Action Problem statement added following site file review. No documentaion is present in the site file which would indicate cleanup has begun or has been completed. Sarah Cunningham
8/11/2005 Update or Other Action Emailed ARRC contact requesting any more current information about the site. Sarah Cunningham
8/19/2005 Update or Other Action ARRC returned email from 8/11/2005 indicating that no more work has been done at the site since 1993. Sarah Cunningham
8/29/2005 Update or Other Action Emailed ARRC contact regarding the fate of the stockpiles generated from the removal of the two tanks-the stockpile had been lined, covered, and secured in 1993, but no records indicate that it was removed. Sarah Cunningham
8/17/2006 Underground Storage Tank Site Characterization or Assessment Approved Work Plan to Excavate three test pits and collect up to six samples in the area of the 1993 excavation to confirm complete removal of impacted soil. The existing stockpile will also be screened using a PID and up to two samples will be collected. Bill O'Connell
1/23/2007 Underground Storage Tank Site Characterization or Assessment Received Sub-surface Investigation Former Broad Pass Section House. ARRC excavated 4 test pits near the former USTs. Only one test pit contained contamination above cleanup levels. DRO was detected in TP 2 at 4,860 mg/kg. Stockpile was also sampled with results below cleanup levels so stockpile will be spread on site. No GW encountered in test pits. Bill O'Connell
3/16/2007 Exposure Tracking Model Ranking Intial Ranking Completed Bill O'Connell
6/2/2008 Update or Other Action Longitude and Latitude updated with Google Earth Grant Lidren
5/8/2009 Site Characterization Workplan Approved ADEC received a Work Plan for Drainage Ditch Water Sampling Broad Pass, dated May 7, 2009, and submitted by Clarus. Grant Lidren
12/3/2009 Report or Workplan Review - Other On this date, ADEC received Drainage-Ditch Water Sampling Broad Pass, dated November 24, 2009, submitted by Clarus. The drainage-ditch water sample collected at the south end of the culvert, analyzed for RRO, DRO, GRO, & BTEX, was non- detect. Grant Lidren
2/24/2010 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program has completed a review of the environmental records associated with the ARRC - Broad Pass Railroad Station. 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 no further remedial action will be required as long as the site is in compliance with established institutional controls. This decision is based on the administrative record for ARRC - Broad Pass Railroad Station site, which is located in the offices of the ADEC in Anchorage, Alaska. Grant Lidren
2/24/2010 Institutional Control Record Established Institutional Controls established and entered into the database. Grant Lidren
11/17/2010 Report or Workplan Review - Other On this date ADEC received UST Removal Report Broad Pass Section House submitted by Clarus and dated October 29, 2010. During the drainage ditch sampling effort of 2009, A previously unknown 500 gallon heating oil UST was discovered. The UST was found to be partially open and submerged with water. In 2010, the UST was purged of water and removed from the site. Three soil samples collected 6 inches below the former UST, at 3.75 ft. bgs, contained benzene up to 0.387 mg/kg. The excavation was then backfilled with stockpiled soils and clean fill to bring to grade. Grant Lidren
6/13/2012 Update or Other Action Staff changed from Grant Lidren to IC Unit. Kristin Brown
6/13/2012 Institutional Control Compliance Review IC review conducted and reminder system set-up for 2015 follow-up with responsible party. Kristin Brown
4/2/2015 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Brown
4/14/2015 Institutional Control Update ADEC was contacted by the responsible party in response to the IC reminder letter. There has been no change in land use or ownership at this site since the 2010 establishment of institutional controls. Kristin Brown

Contaminant Information

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

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Excavation / Soil Movement Restrictions

Missing Location Data

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