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Site Report: Galena AFS/Airport - CG001/CG002 MGH/MSA


Site Name: Galena AFS/Airport - CG001/CG002 MGH/MSA
Address: West Side of Main Airport, Galena, AK 99741
File Number: 860.38.002
Hazard ID: 1416
Status: Active
Staff: Dennis Shepard, 9074512180 dennis.shepard@alaska.gov
Latitude: 64.740368
Longitude: -156.960706
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

On 4/3/91 ADEC was informed that two one-million gallon underground storage tanks (one diesel, one JP-4 jet fuel) had failed tank tightness testing. Tanks #37 and #38 were unregulated underground storage tanks classified as field tanks. Tracer gas was detected in a soil gas probe adjacent to tank at a depth of five feet. The tanks have since been emptied of product and abandoned in place. The tanks were used on site for thirty-four years. Additional contamination likely resulted from ground disposal of sludge cleaned from the tanks and water drained from the tank bottoms. Above ground storage tanks holding JP-8 jet fuel have replaced the abandoned USTs. Air Force Installation Restoration Program Sites: Million Gallon Hill (CG001) and Missile Storage Area (CG002). The two IRP sites are believed to have common contamination sources, and are therefore treating as one site commonly referred to as Million Gallon Hill. Free-phase product and dissolved petroleum constituents above cleanup levels have been documented in monitoring wells downgradient of the tanks. Periodic free product recovery was conducted over the 1990s. The current remedial strategy is bioventing. --Updated 2011-- In August 2010 a field sampling plan for Million Gallon Hill and Missile Storage Area was developed. Million Gallon Hill was identified as a candidate for the site characterization pathway. The goal of the site characterization pathway is to characterize the lateral and vertical extend of the contamination. This plan was approved in 2011, and sampling was expected to begin during the summer of 2011. Data from this sampling event will be available following the 2011 field season. Missile Storage area is also on the site characterization pathway. Sampling for this area is expected to beging during the 2011 field season.

Action Information

Action Date Action Description DEC Staff
4/15/1991 Site Added to Database Hydrocarbon soil contamination. No Longer Assigned
7/13/1991 Leaking Underground Storage Tank Corrective Action Underway (Old R:Base Action Code = LCAR - Corrective Action Review (LUST)). Air Force requested clarification regarding requirement for site assessment and corrective action per 18 AAC 78. Noland determined that site assessment was conducted in 1991 and further corrective action has been conducted since under the Installation Restoration Program (IRP) which satisfies 18 AAC 78.200 - 78.270. Laura Noland
8/13/1991 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). ADEC staff observed site investigation activities by Environmental Science and Engineering, Inc. Two monitoring wells were installed, one of the wells exhibited a very strong diesel odor. Five monitoring wells have been installed, three of which have possible petroleum contamination. Site assessment work at Galena will continue for another week. Kalu Kalu
12/20/1991 Update or Other Action (Old R:Base Action Code = MS - Monitoring/Sampling). ADEC was informed by the Air Force of possible leak in tank 37 which presently contains diesel fuel. No Longer Assigned
2/27/1992 Update or Other Action (Old R:Base Action Code = SI - Site Investigation). Staff reviewed Monitoring Well and Borehole Report on Underground Storage Tanks 37,38, and 49 at Galena Airport commissioned by Air Force, report dated 2/10/92. TPH and BTEX contamination found in monitoring wells above cleanup levels. Plume not sufficiently defined; almost 1 foot floating product found. Laura Noland
3/31/1992 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Sent comments regarding summer 1992 workplan at site. Requested workplan before any free product recovery work begin and that API/EPA Consensus Methods be used. Laura Noland
5/6/1992 Update or Other Action (Old R:Base Action Code = RECN - Site Reconnaissance (CS)). Noland and Kalu conducted site visit at Million Gallon Hill with contractor and Air Force. Reviewed site investigation plans and discussed state requirements with RP. Laura Noland
7/8/1992 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Reviewed and sent comments regarding IRP Stage 3 Sampling and Analysis Plan and Work Plan for Campion and Galena AFS. Perimeter Drum site removed from this year's work season and Vehicle Maintenance Building Area added to work plan. million gallon tanks added to IRP work plan and included in West Unit area of investigation. Laura Noland
12/15/1992 Update or Other Action (Old R:Base Action Code = CORR - Correspondence (General)). Requested present status of ADEC request for leak detection for Tank 37 to be completed by 11/1/92. Laura Noland
12/30/1992 Update or Other Action (Old R:Base Action Code = CORR - Correspondence (General)). 11th CEOS faxed volumetric testing results for Tank 37 which were completed on 8/11/92. Tank passed test. No Longer Assigned
2/16/1993 Update or Other Action (Old R:Base Action Code = RI - Remedial Investigation). ADEC received preliminary sampling results from Remedial Investigation work accomplished in 1992. Initial results show extensive groundwater and soil contamination. Primary contaminant appears to be POLs. No Longer Assigned
7/13/1993 Proposed Plan Reviewed and approved closure plans for Tank 38, to be closed in placed. Laura Noland
9/15/1993 Update or Other Action (Old R:Base Action Code = CP - Closure Pending). Received closure notice for UST Number 38, a 1 Million gallon tank known to have leaked in the past. Closure in place. Laura Noland
11/15/1993 Site Ranked Using the AHRM Reranked. No Longer Assigned
4/1/1994 Update or Other Action (Old R:Base Action Code = CORR - Correspondence (General)). Tank 38 was closed in placed per Tank 38 Closure report. ADEC agreed with closure. Contamination in area to be addressed through IRP program as the West Unit. Laura Noland
5/27/1994 Update or Other Action (Old R:Base Action Code = RPL2 - Site Information Request Letter). ADEC staff sent PRP-CS Database Notification Letter to RP requesting update and more environmental information concerning contaminated site. Jeff Peterson
2/21/2003 Update or Other Action Bioventing systems were installed at this site in the mid-90's. THese systems were operated periodically, but not properly maintained or monitored. In 2002 work was completed by an Air Force contractor to evaluate the systems. Further characterization of the soil and g.w. were completed. Groundwater concentrations still exceed cleanup levels. The bioventing systems will be overhauled in 2003 and continue to be operated. WElls will be installed downgradient to assess contaminant migration from the site. Ann Farris
9/17/2003 Update or Other Action Staff received the Draft Remedial Investigation/Feasibility Study Work Plan for Galena Airport. Staff has begun review of the document. A comment resolution/technical project team meeting is scheduled October 2-3rd in Anchorage. This work plan is intended to address the many outstanding site characterization issues that were raised by Louden Tribal Council, the Environmental Protection Agency, and ADEC as well as the Remedial Process Optimization Evaluation completed in 2002. Ann Farris
1/22/2004 Meeting or Teleconference Held Staff attended the 7th Galena Technical Project Team Meeting on January 12 through 15th. We discussed most of the contaminated sites at the Galena Air Force Station and the Campion Radio Relay Station. We evaluated the adequacy of the historical site characterization, the need for further characterization, possible remedial options, the adequacy of exiting remediation systems, and the need for a risk assessment. Of the 23 sites reviewed at the meeting, 5 are closed already by ADEC, 5 are believed to not need any further characterization or remediation. The remaining 13 need additional investigation or remediation of some type. Additionally, there are a few sites that were not covered during this meeting that will still need to be reviewed. Million Gallon Hill - The site is pretty well characterized. There is still a question about possible migration to the northwest. Further groundwater monitoring under the RI will assess that possible migration pathway. In addition, the performance of the existing bioventing systems will be evaluated under the RI. There will be an evaluation of remedial alternatives for the groundwater contamination under the RI as well. Ann Farris
4/19/2004 Meeting or Teleconference Held Staff participated in the 9th Galena Technical Project Team meeting on April 19th. The meeting was between representatives of the Air Force, Louden Tribal Council, City of Galena, Galena City School District, and the Alaska Department of Environmental Conservation. The primary objective of this meeting was to complete comment resolution on the the Draft Final Remedial Investigation/Feasibility Study Work Plan. The team did ultimately come to resolution on the work plan and the final version is expected out by mid-May. Ann Farris
8/30/2004 Meeting or Teleconference Held 11th Galena Technical Project Team in Anchorage. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
10/21/2004 Meeting or Teleconference Held Galena RAB meeting. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
11/5/2004 Meeting or Teleconference Held 12th Galena Technical Project Team in Anchorage. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
11/19/2004 Meeting or Teleconference Held Attended a week long meeting in San Antonio, Texas to participate in the formulation of an outline for the Galena Airport and Campion Air Station Remedial Investigation/Feasibility Study (RI/FS). Colin Craven
1/12/2005 Update or Other Action Submitted comments to the Air Force to finalize the 2004 Site Recommendations for the upcoming Remedial Investigation report. The 2004 Site Recommendations were produced during the November 2004 meetings in San Antonio, Texas. Colin Craven
1/28/2005 Meeting or Teleconference Held Galena RAB meeting. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
1/28/2005 Meeting or Teleconference Held 13th Galena Technical Project Team in Galena. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
3/18/2005 Update or Other Action Comment resolution between DEC and the Air Force has been achieved on the draft Human Health Risk Assessment Work Plan for the Galena Airport and Campion Air Station. The Air Force contractors are currently finalizing the work plan. Colin Craven
4/19/2005 Meeting or Teleconference Held 14th Galena Technical Project Team in Anchorage. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
4/26/2005 Meeting or Teleconference Held Galena RAB meeting. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
5/13/2005 Meeting or Teleconference Held 15th Galena Technical Project Team meeting in Galena. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
6/9/2005 Meeting or Teleconference Held 16th Galena Technical Project Team in Anchorage. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
7/20/2005 GIS Position Updated Updated the location of the tank farm; interpolated from USGS quadrangle map. Colin Craven
8/30/2005 Meeting or Teleconference Held 17th Galena Technical Project Team in Galena. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
10/12/2005 Meeting or Teleconference Held Galena RAB meeting. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
10/20/2005 Meeting or Teleconference Held 18th Galena Technical Project Team in Anchorage. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
1/3/2006 Update or Other Action DEC received the draft Remedial Investigation and Feasibility Study. The Air Force is proposing to continue air injection bioventing to address petroleum contaminated soils, and additional installation of monitoring wells to better delineate the resultant groundwater plume. Long term monitoring and land use controls would be an integral part of the remedy. DEC comments will be submitted in February. Colin Craven
1/26/2006 Meeting or Teleconference Held 19th Galena Technical Project Team in Galena. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
3/7/2006 Update or Other Action The draft risk assessment found no unacceptable risk for this site, so no feasibility study was conducted. The Air Force has proposed air injection bioventing, long term groundwater monitoring (LTM) and land use controls (LUCs) until residual contamination has attenuated to Method 2 cleanup levels. DEC can not agree with the adequacy of the remedy until comments on the draft risk assessment are resolved. Colin Craven
3/14/2006 Meeting or Teleconference Held 20th Galena Technical Project Team in Anchorage. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
6/1/2006 Site Characterization Workplan Approved The Air Force and DEC came to agreement on a work plan for monitoring well installation and sampling that will serve to fill data gaps identified during the recent remedial investigation. Two monitoring wells with screened intervals below the top portion of the aquifer will be installed to better delineate the vertical distribution of the petroleum contamination. One well will be at the “mid-plume” and the other at the farthest downgradient edge of the plume; these new wells will help establish a sufficient network for long-term monitoring. Colin Craven
6/20/2006 Meeting or Teleconference Held 21st Galena Technical Project Team in Galena. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
10/6/2006 Meeting or Teleconference Held 22nd Galena Technical Project Team meeting in Anchorage. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
11/17/2006 Meeting or Teleconference Held 23rd Galena Technical Project Team meeting in Fairbanks. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
11/17/2006 Update or Other Action Two deeper interval monitoring wells were installed in summer 2006. 09-MW-29 was installed at the southern base of Million Gallon Hill, adjacent to a shallow monitoring well that had been showing non-detection for BTEX compounds. 09-MW-30 was installed farther downgradient of the hill, to the west and deeper than other wells that had previously served as sentry wells. Both 09-MW-29 and 09-MW-30 showed significantly higher benzene concentrations than the nearby shallow wells (43 and 110 micrograms per liter, respectively). Because of these new findings, it is no longer clear whether or not the plumes emanating from Million Gallon Hill and the Missile Storage are reaching the Yukon River. Colin Craven
1/18/2007 Meeting or Teleconference Held 24th Galena Technical Project Team meeting in Anchorage. See the "Galena AFS - Sitewide" listing for more details. Colin Craven
9/1/2010 Site Visit Site visit Amanda Loomis
2/15/2011 Meeting or Teleconference Held TPT meeting, site discussed Fred Vreeman
4/15/2011 Meeting or Teleconference Held TPT meeting, site discussed Fred Vreeman
5/5/2011 Meeting or Teleconference Held TPT meeting, site discussed Fred Vreeman
5/25/2011 Site Characterization Workplan Approved CG001/CG002 approval of SC workplan Fred Vreeman
5/25/2011 Conceptual Site Model Submitted TPT meeting, site discussed Fred Vreeman
6/9/2011 Site Visit Site visit, field work audit Fred Vreeman
6/16/2011 Site Visit Site visit, field work audit Amanda Loomis
6/21/2011 Meeting or Teleconference Held TRIAD meeting, 2011 sample data discussed Fred Vreeman
7/8/2011 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 72394 name: auto-generated pm edit Galena AFS - Million Gal. Hill CG01 Amanda Loomis
7/27/2011 Update or Other Action Draft Final Optimization Study and Response to Comments submitted by USAF Fred Vreeman
8/4/2011 Update or Other Action Revised CG001 sample depths approved Fred Vreeman
8/9/2011 Update or Other Action 09MW05 Decommissioning approved Fred Vreeman
9/15/2011 Update or Other Action Conditional approval of the Field Sampling Plan for Million Gallon Hill was given. The conditional approval states: 1) that additional work tasks may be required to reach complete characterization of the site. 2) Prior to preparing a Site Characterization report, an additional workplan will be required that analyzes the results of investigation and identifies data gaps and will include a feasibility study. Dennis Shepard
9/27/2011 Meeting or Teleconference Held TRIAD meeting held. Site discussed. DEC approves installation of 2 well clusters (CG001-MW004 and CG001-MW005). Dennis Shepard
10/20/2011 Meeting or Teleconference Held TRIAD Meeting Held. Site discussed. One Soil stepout CG001_GP028 to the south of TCE exceedances at GP019 was approved. Dennis Shepard
5/18/2012 Report or Workplan Review - Other DEC received the Draft Site Characterization results report for the Site. Dennis Shepard
10/16/2012 Report or Workplan Review - Other DEC provided review comments for the Draft Site Characterization results report. Dennis Shepard
11/8/2012 Meeting or Teleconference Held A meeting was conducted with DEC contractor Shannon and Wilson to identify all remaining data gaps in the site characterization for all Galena Sites including CG001/CG002. Dennis Shepard
6/18/2013 Report or Workplan Review - Other DEC received a Draft Final version of the Site Charaterization results report for the Site. Dennis Shepard
6/26/2013 Report or Workplan Review - Other DEC provided review comments for the Draft Final version of the Site Charaterization results report for the Site. Dennis Shepard
7/22/2013 Meeting or Teleconference Held A teleconference call was held to resolve final issues on the Site Characterization results report for the Site. All issues were resolved. Dennis Shepard
9/24/2013 Report or Workplan Review - Other DEC received a Final version of the Site Characterization results report for the Site. Dennis Shepard
10/3/2013 Site Characterization Report Approved The Site Characterization results report for the Site is approved. Dennis Shepard
6/24/2014 Site Characterization Workplan Approved DEC approved the 2013 Supplemental Site Characterization (SC) Sampling Plan, Former Galena Forward Operating Location (FOL), Galena, Alaska. This additional sampling was agreed to during a November 2012 Galena Data Gaps meeting. Dennis Shepard
9/4/2014 Site Characterization Report Approved DEC approved the Supplemental Site Characterization Results Report, Million Gallon Hill (Site CG001) and Missile Storage Area (Site CG002), Former Galena Forward Operating Location (FOL), Alaska. DEC/Air Force - comment/response and documentation of the agreements for a supplemental site characterization are documented in the approval letter (DEC_approval_CG001_CG002_df_suppSC_082014). Dennis Shepard
11/24/2014 Site Characterization Report Approved DEC approved the Addendum Site Characterization Results Report for this site. The purpose of the addendum was to address requirements for an SC Report under 18 AAC 75.335 (c) (DEC, 2012), specifically, to propose cleanup levels and remedial techniques for the site. Monte Garroutte
11/28/2014 Risk Assessment Report Approved DEC approved the Screening Level Ecological Risk Assessment (SLERA) for Million Gallon Hill and Missile Storage Area, (Sites CG001 & CG002). The report concluded there were no unacceptable ecologic risks. Dennis Shepard
10/26/2016 Update or Other Action Met with the CH2M project manager and a representative from Directed Technologies Drilling (DTD)while in Galena Alaska for a restoration advisory board meeting. The DTD engineer presented a video of the horizontal directed drilling project that is being planned to install a horizontal well/ sparging system at the CG001 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
3/30/2017 Cleanup Plan Approved DEC provided approval for the Subsurface Aeration (Horizontal Well) Cleanup Plan for Sites CG001, CG002, CB001, and Southern ST005. Dennis Shepard

Contaminant Information

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