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Site Report: ADOT&PF Dutch Hbr-Airport Torpedo Building

Site Name: ADOT&PF Dutch Hbr-Airport Torpedo Building
Address: Unalaska Airport, Amaknak Island, Unalaska, AK 99685
File Number: 2542.38.010
Hazard ID: 1328
Status: Active
Staff: Grant Lidren, 9072698685
Latitude: 53.894701
Longitude: -166.540614
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.


In 1991, DRO contaminated soil/groundwater was encountered outside the Torpedo Building as well as significant petroleum and lead contamination inside it. Leachable lead was found in a composite sample from sediments on the concrete building floor at a concentration of 1,010 mg/l (TCLP regulatory level is 5 mg/l). The Torpedo Building was constructed by at least 1942 for the purpose of preparing torpedoes for loading onto aircraft during WWII. The building and property is currently owned by ADOT&PF. It is unoccupied and in deteriorating condition. Potential source areas include a former fuel pipeline owned and operated by Reeve Aleutian Airlines on the east side of the property, Northern Air Cargo operations on the north side of the property, and WWII military activities within and around the Torpedo Building itself. In 1997, lead impacted sediments, misc. drums, and solid waste were removed from the Torpedo Building. The Torpedo Building was decommissioned in 2016.

Action Information

Action Date Action Description DEC Staff
12/3/1992 Notice of Violation Issued NOV to ADOT/PF, site owner, for purpose of formally documenting the oil and hazardous substance release. The site is a Formerly Used Defense Site (FUDS) and is scheduled for assessment by the Army Corps of Engineers in FY95. Reeve Aleutian Airlines is a potentially responsible party for some of the site contamination. No Longer Assigned
12/11/1992 Update or Other Action (Old R:Base Action Code = CORR - Correspondence (General)). Received cc'd copy of letter from ADOT/PF to Richard Parrish, Program Manager, Programs and Project Management Division, Army Corps of Engineers, requesting that the ACOE as the Department of Defense agent accept the site as their responsibility and initiate the necessary procedures to clean it up. To date, the site has not been listed on the Corps' contaminated sites list. No Longer Assigned
3/22/1993 Site Added to Database Soil/sediment inside the building contains high levels of lead, diesel range organics and possibly other contaminants. No Longer Assigned
8/9/1994 Site Ranked Using the AHRM Initial ranking. No Longer Assigned
1/3/1995 Meeting or Teleconference Held A meeting between the COE/DEC and Ounalashka Corp. added this site to the Corps FUDS list for investigation and possible cleanup; needs to go through the FUDS Potentially Responsible Party (PRP) process. Ray Dronenburg
12/20/1996 Update or Other Action Corps of Engineers PRP Center of Expertise, released the Torpedo Building site from the PRP project at Dutch Harbor due to a lack of information to make a liability determination under CERCLA. It authorized the Alaska District to conduct a site inspection or limited remedial investigation. John Halverson
4/20/1998 Update or Other Action DOT submitted a report titled, "Pre-Demolition Building Material Assessment Torpedo Building, Unalaska Airport" by Shannon and Wilson, dated December 1997. It estimates approximately 65 cubic yards or 100 tons of sediment from the floor of the building may be RCRA regulated hazardous waste due to lead contamination, lead based paint and asbestos are present, drums of waste in the building could be used or disposed of properly within Unalaska. John Halverson
4/21/1998 Update or Other Action DOT submitted a report titled, "Prelease Site Assessment Torpedo Building Property Dutch Harbor" by Shannon and Wilson, dated March 1991. Five testpits (TP1 – TP5) were excavated to depth of 9.5 feet bgs. TP1 & TP2 were located adjacent to a buried fuel line. TP3, TP4, and TP5 were located in areas of suspected contamination based off previous investigations. Only TP2 contained petroleum constituents above cleanup levels with TPH up to 4,700 mg/kg and diesel up to 2,750 mg/kg from a sample collected 8.5 feet bgs. Additionally, TP2 contained product on the GW at the bottom of the TP2 excavation 9 feet bgs at the GW interface. A GW sample collected at this location contained TPH up to 2,130 mg/L. Three composite surface samples (SS1, SS2, and SS3) were collected. SS1 was collected from the surface of the concrete floor in the Torpedo Building and contained TPH at 120,000 mg/kg and lead at 186, 639 mg/kg. SS2 was collected west of 55 gallon barrels stored at the NAC building and contained TPH up to 2,410. SS3 was collected from a mound of soil with debris on the southern side of the western entrance to the Torpedo Building and contained lead at 430.9 mg/kg. Grant Lidren
1/4/1999 Update or Other Action Frosty Fuels removed an underground storage tank from the runway apron area in 1998, and removed a portion of the pipeline from the tank back towards the former aqua fuel system later in 1998. The fuel line ran adjacent to the Torpedo Building, along the east side. Hart Crowser prepared a "Pipeline Removal and Monitoring Well Abandonment Report, Dutch Harbor Airport Release Investigation" dated October 12, 1998, to DEC's UST Program. The report did not identify fuel contamination beneath the line and the UST Program closed the UST and fuel line as meeting the requirements within 18 AAC 78 (UST regulations). Paul Horwath
4/15/1999 Site Characterization Workplan Approved ADEC approved EMCON Alaska's "Environmental Assessment Workplan Lease Lots 6A, 6B, and 7 - Unalaska" dated April 1999. John Mazzitello
8/2/1999 Site Characterization Report Approved ADEC accepted the "Final Environmental Assessment Report Lease Lots 6A, 6B and 7 Unalaska Airport", by EMCON, dated July 1999. DRO contamination was documented in soil and shallow groundwater on the NE corner of the Torpedo Building with a boring containing DRO up to 993 mg/kg and GW in MW-1 containing DRO up to 55 mg/L. MW2, MW3, and MW4 contained detectable concentrations of DRO but below ADEC cleanup levels. MW-5 was dry. Recommended quarterly groundwater monitoring and corrective action to remove the lead contaminated sediments from within the building. John Halverson
8/25/1999 Site Characterization Report Approved ADEC received the final report titled "1998 SI, RI, IRA Amaknak and Unalaska Islands" dated August 1999, by Jacobs Engineering. No field work was done at this site in 1998. Coordination with NPS, SHPO as well as determination of FUDS eligibility should be done before work begins. Meghan Dooley
10/6/1999 Site Ranked Using the AHRM Updated the site ranking using the most recent data resulting in a medium priority. John Halverson
6/5/2000 CERCLA RI Report Approved The Comprehensive Remedial Investigation Report was received. This document discusses the field activities and results from 1996, 1997, 1998, and 1999. Activities included site investigations (SI), Interim Removal actions (IRA) and Remedial Investigations (RI). These various activities were performed at 56 sites throughout the entire Amaknak/Unalaska FUDS. Sampling was conducted to determine both site-specific as well as background levels of contaminants of concern. 93 underground storage tanks (USTs), 1 above ground storage tank (AST), associated piping, and 230 drums, contaminated liquid, sludge, and soil were removed from the various sites during the IRA. Soil borings were drilled, monitoring wells installed and samples were taken to determine type and extent of contamination. Where appropriate a Method Three ACL was calculated. 31 sites are recommended for no further action (NFA) and 25 sites were recommended for further remedial action. For the Torpedo Shop, the report recommends that FUDS eligibility be evaluated before work is performed. Meghan Dooley
1/11/2001 Meeting or Teleconference Held Coordination phone conference held with DOT to determine scheduling for a cleanup of the sediments. Conference call, Dan Breeden, Dan Golden, Jack Nalton, Andy Peterson (ADOT&PF Anchorage), Troy LaRue (Unalaska Airport Manager) John Halverson, Deb Caillouet. DOT has gotten the demolition project on the schedule to be funded in 2004. They can remove the sacks of urea (what we thought was concrete), tires, washing machine. If the drums contain on spec used oil, they are getting a used oil burner and could store until then. The best time for the work to be done, when their manpower would be most free to assist would be late Spring (second week in May). The building appears to be structurally safe, no recent flying panels. We will go ahead and put out for bid and see what can be done. Debra Caillouet
4/9/2001 Update or Other Action A notice to proceed was issued to Shannon and Wilson to develop the work plan to clean up the sediments in the Torpedo Building. Debra Caillouet
7/16/2001 Interim Removal Action Approved Final report received on the interior clean up of the building. 74 drums of lead impacted soils; a drum of motor oil; and a drum of used sorbent pads, used oil filters and oily sludge; two drums of soil cuttings and two drums of purge water left from a previous investigation were removed and disposed. Tidal influence measurement shows groundwater to flow NNE at high tide and WSW at low tide. GW from MW1 contained DRO at 9.49 mg/L. GW from MW3 & MW4 did not contain detectable levels of contaminants. Debra Caillouet
8/15/2003 Report or Workplan Review - Other On this date, ECI Hyer submitted the Building Condition Assessment/Materials Investigation Torpedo Bombsight and Utility Shop. Grant Lidren
1/8/2004 Update or Other Action CIP Funded work at this site is completed as site is now stable and human and environmental risk has been reduced. Further cleanup under other programs may occur in the future. Mike Jaynes
6/10/2005 Update or Other Action File number issued 2542.38.009 Aggie Blandford
10/11/2007 Exposure Tracking Model Ranking Debra Caillouet
1/15/2009 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 72306 name: spills Debra Caillouet
12/15/2014 Report or Workplan Review - Other On this date, DOT and FAA submitted the Unalaska Airport Safety Improvements Project Number 55826 Final Environmental Assessment, Finding of No Significant Impact, and Section 4(f) individual evaluation. Grant Lidren
11/5/2015 Update or Other Action This site is not Defense & State Memorandum of Agreement (DSMOA) eligible. Grant Lidren
11/5/2015 Update or Other Action DOT is currently in the planning phases to decommission the Torpedo Building. Date of decommissioning is summer of 2016. Grant Lidren
2/24/2016 Update or Other Action On this date, ADEC received the Lot6F, Block 2, Unalaska Airport Environmental Baseline Investigation submitted by Travis & Peterson dated November 24, 2015. Lot 6F is located to the west and northwest immediately adjacent of the Torpedo Building located on lot 6G. Eight testpits were advanced on lot 6F in areas of potential contamination. Five testpits were excavated to 3 feet bgs and three were excavated 8 to 10 feet bgs at the groundwater interface with wellpoints installed. Only two of the eight testpits contained contaminant concentrations above cleanup levels. Soil samples collected from TP1 at 2.5 feet bgs and WP-2 at 2.0 feet bgs, located west of the Torpedo building contained DRO at 253 mg/kg and 271 mg/kg respectively (Note: soil samples contained detectable levels of PCBs, lead, and RRO). None of the groundwater samples collected from the three well points contained detectable levels of contaminants. Grant Lidren
6/29/2016 Site Characterization Workplan Approved DEC approved the Lot 6F, Block 2, Unalaska Airport Debris Pile Removal Work Plan on this date. Grant Lidren
9/15/2016 Site Characterization Report Approved On this date, ADEC received the 2016 Unalaska Airport Debris Pile Removal Project submitted by Travis and Peterson dated September 2016. A 110 cy debris pile was removed from the site and the debris and soils were segregated. The soils were put into six stockpiles; approximately 15 to 20 cy each. Five footprint soil samples collected from the former 110 cy debris pile footprint contained DRO up to 294 mg/kg. A total of 14 soil samples collected from the six stockpiles did not contain contaminant concentrations above cleanup levels except one soil sample collected from stockpile 4 which contained DRO at 271 mg/kg. A monitoring well reconnaissance and the sampling of MW-1 was also performed. MW-1 was found intact with destroyed cover, needs decommissioning; MW-2 was found to be paved over and presumed destroyed; MW-3 was located, destroyed and needs decommissioning; MW-4 could not be located, presumed destroyed; MW-5 was verified destroyed. Two groundwater samples collected from MW-1 were below table C groundwater cleanup levels. Grant Lidren
9/23/2016 Update or Other Action On this date, ADEC approved the Lot 6F, Block 2, Unalaska Airport Stockpile TCLP Lead Sampling Work Plan ADEC File No. 2542.38.010 submitted by Travis and Peterson dated September 23, 2016. Grant Lidren
10/21/2016 Site Characterization Report Approved ADEC received the Lot 6F, Block 2, Unalaska Stockpile TCLP Lead Sampling Report submitted by Travis and Peterson and dated October 20, 2016. Two five-spot soil samples were collected from each of the six onsite stockpiles and analyzed for lead, PCBs, and TCLP. Only one soil sample collected from stockpile SP3 contained contaminant concentration above cleanup levels with lead up to 462 mg/kg. The TCLP samples ranged from 0.156 mg/L and 4.32 mg/L, which is below the TCLP limit of 5 mg/L. Grant Lidren
10/26/2016 Offsite Soil or Groundwater Disposal Approved On this date, ADEC approved the transport of the six onsite stockpiles (110cy of petroleum and lead impacted soil to the Unalaska Class I landfill). Grant Lidren
7/6/2017 Update or Other Action Four of the six onsite stockpiles are awaiting transport (on a 20 mil liner capped with a 6 mil liner) to the Unalaska landfill. The other two stockpiles, #3 and #4, were not accepted by the landfill due to lead and DRO contamination respectively. Removal/treatment of stockpiles #3 and #4 has yet to be determined. Grant Lidren
10/23/2017 Update or Other Action ADEC received and reviewed the September 28, 2017 Lot 6F, Block 2, Unalaska Airport Soil Stockpile Site Status Letter (ADEC File #2542.38.010 submitted by Travis and Peterson. Stockpiles #1,#2,#5,and #6 were transported to the Unalaska landfill and used as cover. Lead contaminated stockpile #3 was placed into 18 supersack bags and remain on property for potential beneficial reuse. Stockpile #4 is being landfarmed on site. Grant Lidren
10/30/2017 Report or Workplan Review - Other ADEC reviewed and approved the Lot 6F, Block 2, Unalaska Airport Landfarm Sampling Work Plan dated October 30, 2017 submitted by Travis/Peterson. Grant Lidren
11/22/2017 Site Characterization Report Approved On this date, ADEC received the Lot 6F, Block 2, Unalaska Airport Landfarm Sampling Report submitted by Travis and Peterson dated November 22, 2017. Five soil samples were collected 6 to 8 inches into the 12 inch deep landfarm (stockpile #4) and analyzed for DRO. These soil sampled contained detectable concentrations of DRO but below the ADEC method two cleanup level of 230 mg/kg. DEC has approved transport of these soils to the Unalaska landfill to be used as cover Grant Lidren
3/13/2018 Offsite Soil or Groundwater Disposal Approved On this date, Northern Mechanical Hauled the 18 CY land farmed soil (DRO impacted stockpile#4), to the City Landfill to be used as Cover Material. The 18 supersack bags of impacted lead contaminated soil remain on site. Grant Lidren

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