Division of Spill Prevention and Response

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Site Report: Galena AFS/Airport - SS015 South Apron Trichloroethene Area


Site Name: Galena AFS/Airport - SS015 South Apron Trichloroethene Area
Address: South of Cantonment Triangle, Galena, AK 99741
File Number: 860.38.044
Hazard ID: 25906
Status: Active
Staff: Dennis Shepard, 9074512180 dennis.shepard@alaska.gov
Latitude: 64.734853
Longitude: -156.939166
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 was identified as the location of a former Radar Approach and Control Facility (RAPCON)during the 1950s. In 1991 concentrations of PCE, TCE, GRO, and DRO were found above DEC Method 2 migration to groundwater cleanup levels. Site SS015 is located at the South Apron in the southeastern portion of the Former Galena FOL. The site is a known chlorinated solvent- and fuel-contaminated soil source area, most likely resulting from previous releases from AST and maintenance activities at Site SS015. TCE and PCE concentrations appear to have spread laterally into the subsurface from the suspected source/spill area to depths of at least 36 feet bgs and are distributed in the same pattern as the dissolved-phase groundwater plume. The dissolved-phase groundwater plume extends south into Old town Galena.



Action Information

Action Date Action Description DEC Staff
5/18/2012 Report or Workplan Review - Other DEC received a Draft Remedial Investigation results report for the Site. Dennis Shepard
9/7/2012 Site Added to Database A new site has been added to the database Mitzi Read
10/10/2012 Update or Other Action DEC sent a letter to EPA concerning Risk Assessments (RAs) for Remedial Investigation Sites at Galena. DEC has asked EPA to provide an opinion on risk assessment issues requiring resolution for the remedial investigation sites at Galena. Specific issues of concern are: determination of risk assessment source area and calculation of exposure point concentrations Dennis Shepard
10/22/2012 Report or Workplan Review - Other DEC provided review comments for the Remedial Investigation results report for the Site. Dennis Shepard
11/15/2012 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79327 name: SS015 South Apron Trichloroethene Area Dennis Shepard
2/18/2013 Report or Workplan Review - Other DEC received a Draft Final Remedial Investigation results report for the Site. Dennis Shepard
5/8/2013 Report or Workplan Review - Other DEC provided review comments for the Draft Final Remedial Investigation results report for the Site. Dennis Shepard
5/23/2013 Meeting or Teleconference Held A comment resolution conference call meeting was held to reach agreement on the final unresolved issues for the Remedial Investigation results report for the Site. DEC comments were adequately addressed and all issues for the report were resolved. Dennis Shepard
7/1/2013 Report or Workplan Review - Other A Final version of the Remedial Investigation results report was submitted. Dennis Shepard
8/30/2013 Report or Workplan Review - Other DEC received Draft Risk Assessment Data files and figures to review for this Site. The Air Force is preparing both human health and ecological risk assessments for this site, and by previous agreement, DEC review and approval of the data set is a critical first step in the process. DEC provided review comments for Human Health assessment concerns for the Data set on this day. Dennis Shepard
9/17/2013 Report or Workplan Review - Other DEC provided review comments for Ecological Risk Assessment concerns for the Draft Risk Assessment Data files and figures provided on August 30, 2013. Dennis Shepard
10/22/2013 Meeting or Teleconference Held The Air Force, its contractor and DEC met in a teleconference meeting to agree on a framework for evaluating vapor intrusion of SS015 in the risk assessment for the site. Groundwater at the site has high concentrations of chlorinated solvents; i.e., up to 910 ug/L of Trichloroethylene (TCE). Vapor intrusion is a potential issue. Dennis Shepard
10/22/2013 Meeting or Teleconference Held The Air Force, its contractor and DEC met in a teleconference meeting to agree on a framework for evaluating vapor intrusion of SS015 in the risk assessment for the site. Groundwater at the site has high concentrations of chlorinated solvents; i.e., up to 910 ug/L of Trichloroethylene (TCE). Vapor intrusion is a potential issue. Dennis Shepard
10/29/2013 CERCLA RI Report Approved DEC approved the Remedial Investigation (RI) results report for the Site. By Agreement with DEC, the RI results report does not contain a Baseline risk assessment. A risk assessment for the Site is being completed under a separate Air Force contract/effort. Dennis Shepard
11/13/2013 Report or Workplan Review - Other DEC received a Draft Risk Assessment for Site. Dennis Shepard
12/20/2013 Report or Workplan Review - Other DEC provided review comments for the Draft Risk Assessement for the Site. One significant comment concerned the absence of a proposed approach to assess the inhalation exposure potential for a pregnant woman exposed to Trichloroethylene (TCE) during a 21 day early gestation period. Dennis Shepard
4/15/2014 Meeting or Teleconference Held A Technical Project Team meeting was held to meet the Air Force newly selected Performance Based Remediation Contractor for Galena. The 6.5 year remediation contract was awarded to Parsons Governmental Services (Parsons). The contract includes completing the risk assessments, remediation feasibility studies, proposed plans and record of decision for remedial investigations at 10 Sites (FT001, SS006, SS013, SS015, SS019, SS018/AOC023, SS022/B400, DP023/DSWD, OW024/OWS1833, and SS025). Monte Garroutte
9/5/2014 Risk Assessment Report Approved DEC approved the Human Health and Ecological Risk Assessment, South Apron Maintenance Area (Site SS015). The assessment concluded that cumulative carcinogenic risk is greater than the cumulative risk goal of 1 × 10-5 for: Current/future occupational workers, Near-term and long term future residents, exposed to surface soil, indoor air, and potable groundwater. The reported Hazard Index for petroleum hydrocarbon constituents is greater than 1 for each of these receptor groups. Dennis Shepard
6/1/2015 CERCLA FS DEC approved the Feasibility Study Report for South Apron Maintenance Area (Site SS015), Performance-Based Remediation at Galena. The selected alternative consists of soil vapor extraction, bioventing, enhanced anaerobic bioremediation/enhanced biogeochemical transformation, land use controls, and monitored natural attenuation. Dennis Shepard
10/2/2015 CERCLA Proposed Plan DEC approved the proposed plan - Air Force Proposes Alternatives for South Apron Maintenance Area (Site SS015) with Soil and Groundwater Impacts Based on Environmental Investigation Results – Public Comment Invited, Former Galena Forward Operating Location (FOL), Alaska. Dennis Shepard
10/20/2015 CERCLA Proposed Plan A Restoration Advisory Board (RAB) Meeting was held in Galena Alaska. The DEC approved Proposed Plan for the site SS015 was presented during the RAB meeting. Public comment was recorded during the meeting and written comments were solicited in a booklet which contained all three proposed plans being presented (Plans for Sites SS015, SS0222, OW024). Dennis Shepard
5/24/2016 Report or Workplan Review - Other DEC provided comments for the Draft Record of Decision for the site. Dennis Shepard
10/26/2016 Meeting or Teleconference Held A restoration Advisory board meeting was held in Galena Alaska to discuss the general and specific status of site investigations and cleanup at Galena. Dennis Shepard

Contaminant Information

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