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Site Report: Adak SWMU 60 Tank Farm A


Site Name: Adak SWMU 60 Tank Farm A
Address: OU A, Adak Naval Air Facility, Adak, AK 99546
File Number: 2501.38.003.01
Hazard ID: 686
Status: Active
Staff: Darren Mulkey, darren.mulkey@alaska.gov
Latitude: 51.860708
Longitude: -176.660375
Horizontal Datum:NAD83

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

Tank Farm A was built and placed into service in 1943. The facility contained 45 bulk storage field constructed tanks ranging in capacity from 21,000 to 420,000 gallons. The tanks were used to store mogas, diesel, and JP-5. A series of underground pipelines were used to transfer fuel to, around, and from the tank farm. Many of the tanks were reported to be leaking by the 1950s, when most of the tanks were taken offline. Three new 420,000 gallon tanks were built to replace the leaking tanks in 1954. In 1958, an number of tanks were identified to be leaking and an unspecified number were demolished. 30 tanks were demolished in 1984. In 1993, tanks T8300-A and T8305 were removed. All FCTs and USTs were removed from Tank Farm A by 1993. Several different spills have been recorded at this site from the 1950s to 1989 and resulted from both leaking tanks and pipelines. The site was retained during the initial site screening process due to DRO concentrations above screening levels. Monitored natural attenuation was selected for the site in the OU A ROD. The site was removed from the OU A ROD by the OU A ROD Amendment for regulation under 18 AAC 75. Site decision was carried forth by the amendment. MNA is ongoing at this site. 2005 monitoring data indicates that DRO remains at or above clean-up levels at well LC5A. Benzene remains above clean-up levls at well MW-E006. Both wells will be monitored again in 2006.

Action Information

Action Date Action Description DEC Staff
12/30/1899 Update or Other Action 2004 Annual Monitoring report received. Jason Weigle
1/1/1992 Site Added to Database Site added to database. TPH, DRO, GRO, and metals. No Longer Assigned
9/29/1992 Site Number Identifier Changed Region portion of Reckey number changed to consolidate district 26 into 25. No Longer Assigned
1/1/1994 Update or Other Action Site included in State-Navy two-party SAERA agreement for petroleum sites. No Longer Assigned
6/16/1995 Site Ranked Using the AHRM Score = 48. Initial ranking. Action code added because it wasn't when the site was originally ranked. No Longer Assigned
4/16/1996 Site Number Identifier Changed Consolidated information from all tables from Reckey 199425X118129 into this site. Scott Pexton
5/1/1998 Proposed Plan Site to be included in ROD for OU-A. Christina Goff
9/1/1999 Update or Other Action Site included in OU-A ROD and recommended for institutional controls and monitored natural attenuation due to soil contaminant concentrations (primarily benzene) exceeding 18 AAC 75 criteria and their effect on groundwater. Kevin Oates
4/15/2000 Record of Decision The Record of Decision for this site was signed this date. Elim Yoon
12/28/2001 Institutional Control Record Established Institutional Control Established. Includes Equitable Servitude for: Commercial/Industrial Land Use Restrictions, Groundwater Restrictions, Excavation permit required for areas with Soil Excavation Restrictions, and requirements for Inspections and Reporting. See document “Adak Island Institutional Control Management Plan, Final Edition, December 2001, Prepared by: Engineering Field Activity, Northwest.” Elim Yoon
3/1/2003 Update or Other Action The Final 2001 Annual Groundwater Monitoring Report was received on this date. Navy recommends continued monitoring for natural attenuation. Meghan Dooley
10/10/2003 Record of Decision Site removed from OU A ROD by OU A ROD Amendment; will be regulated under 18 AAC 75. Sami Goldman
6/17/2004 Update or Other Action Comments for the 2003 Annual Groundwater Monitoring report were sent. General concerns include: the field team may not be familiar with the requirements in the CMP and SOP, and changes in ARARs. Meghan Dooley
9/7/2004 Update or Other Action The Final 2003 Annual Groundwater Monitoring Report was received on this date. Well LC5A met endpoint criteria for GRO and BTEX in 2002 and 2003 and so Navy recommends discontinuing monitoring for these parameters but to continue monitoring for DRO. Well MW E006 met endpoint criteria for DRO, GRO, Toluene, ethylbenzene, and xylene, so the Navy recommends continuing monitoring for benzene only at this well. Well MW-E501 was below endpoint criteria for GRO, DRO and BTEX in 2002 and 2003 so the Navy recommends monitoring be discontinued. Meghan Dooley
10/19/2004 GIS Position Updated Latitude and Longitude was derived using ArcGIS with either High Resolution Aerial Photography from the Navy with an up to 3 meters error, or line maps used in investigations combined with road layers, +/-25 feet accuracy.  Metadata is as follows: Updated NAD 1983 State Plane Alaska 10 FIPS 5010 Feet; Projection: Lambert Conformal Conic; False Easting: 3280833.333333; False Northing: 0.000000; Central Meridian: -176.000000; Standard Parallel 1: 51.833333; Standard Parallel 2: 53.833333; Latitude of Origin: 51.000000; GCS North American 1983. Jason Weigle
2/17/2005 Update or Other Action Draft 2004 Annual Monitoring report received. Jason Weigle
3/4/2005 Update or Other Action Review of Draft 2004 Annual Monitoring report completed. Jason Weigle
3/7/2005 Update or Other Action Added MRTS data, derived from ADNR and USGS range, township, and section data overlaid on lat/lon coordinates derived previously. Accuracy is equivalent to the lat/lon coordinates. MRTS information depicts the center point of range fans and target areas; actual target areas or fans may overlap several sections. Jason Weigle
3/8/2005 Update or Other Action Added legal description for site. Jason Weigle
5/23/2005 Update or Other Action The Final 2004 Annual Groundwater Monitoring Report was received on this date. The Navy recommends a reduction of NAP monitoring frequency at wells LC5A and MW E006 to once every 5 years. The Navy also recommends adding a visual inspection of the shoreline of South Sweeper Creek for petroleum seeps and sheen in the 2005 monitoring event. Meghan Dooley
3/20/2006 Update or Other Action Final 2005 Institutional Control Primary Site Inspection Report received on this date. No IC problems noted at this site. Jason Weigle
3/20/2006 Update or Other Action The draft annual groundwater monitoring report for 2005 was received on this date. Jason Weigle
4/5/2006 Update or Other Action File number 2501.38.003.01 assigned on this date. Jason Weigle
4/7/2006 Update or Other Action Comments on the 2005 annual groundwater monitoring reports submitted on this date. 2005 monitoring data indicates that DRO remains at or above clean-up levels at well LC5A. Benzene remains above clean-up levls at well MW-E006. Both wells will be monitored again in 2006. Jason Weigle
6/9/2006 Update or Other Action The Final 2005 Annual Groundwater Monitoring Report was received. The Navy recommends continuing monitoring as prescribed. Meghan Dooley
12/18/2006 Update or Other Action Received Draft 2006 Institutional Control Primary Site Inspection Report that details the results of annual Institutional Control (IC) inspections to determine the effectiveness of IC's selected in the OUA Record of Decision. Guy Warren
12/27/2006 Update or Other Action Submitted comment letter to the Navy on the Draft Institutional Control Primary Site Inspection Report. Comments focused on the adequacy of the excavation notification program, the effectiveness of the ordnance awareness program, and visitor notification of ICs. Guy Warren
2/15/2007 Update or Other Action Received Draft Annual Ground Water Monitoring Report, which presents the results of September 2006 ground water monitoring activities at 24 sites at the Former Adak Naval Complex. Guy Warren
3/13/2007 Update or Other Action Received the Final 2006 Institutional Control Primary Site Inspection Report. Several Department comments will be addressed through revisions of the Institutional Control Management Plan planned for 2007. The remaining comments were addressed and additional recomendations to increase efforts to notify island visitors of ICs (including the ordnance awareness education program) were included in the final document. Guy Warren
4/25/2007 Update or Other Action Submitted comments on the Draft Annual Ground Water Monitoring Report. Primary areas of concern include: increasing trends in contaminant levels at several sites, Increased free product, and adherence to field sampling procedures. In general it appears that declining ground water levels are responsible for the increase in free product and dissolved contaminant concentrations. The Navy and DEC have agreed to reinstate free product recovery at those sites showing increases in free product. Guy Warren
7/26/2007 Update or Other Action Received Final Annual Ground Water Monitoring Report, September 2006. The Department's comments have been addressed in the Final Report. The Navy has agreed to conduct additional free product recovery at those sites with increassed free rpoduct. The Navy has agreed to evaluate conditions at several sites (including SWMU 60) with increasing contaminant trends to determine if additional investigation or remediaiton is required. Guy Warren
12/21/2007 Update or Other Action Received Draft Petroleum Summary Report for sites Antenna Field, SA79, Former Power Plant, SWMU 60, and SWMU 61 at the former Adak Naval Complex. The report summarizes the investigation activities that have been conducted at these sites to date. The report recommends collecting additional ground water samples to evaluate potential migration of contaminants to the down gradient exposure medium Sweeper Creek. Guy Warren
1/9/2008 Update or Other Action Submitted comments on the Draft Petroleum Summary Report (PSR) to the Navy. The Department concurred with the recommended changes to the Annual Monitoring Program for this site with exceptions. The Department is requesting two additional ground water samples and additional sediment sampling to evaluate impacts to surface water and sediment. Guy Warren
1/9/2008 Update or Other Action Site Status changed on this date from "Conditional Closure" to "active". Due to recent changes in guidance, sites where long term monitoring is ongoing are not eligible for "Conditional Closure". Guy Warren
3/28/2008 Update or Other Action The comments for the draft 2007 Annual Groundwater Monitoring Report were sent. General concerns include: consistency of groundwater depth and flow measurements between sites, reporting of free product recovery methods and results, inclusion of the Petroleum Summary Report in recommendations for applicable sites in this report, tracking changes to the CMP, and extending surface water and sediment monitoring to appropriate sites. Meghan Dooley
6/27/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Evonne Reese
8/14/2008 Update or Other Action The Final 2007 Annual Groundwater Monitoring Report was received on this date. The Navy recommends well E-501 be added to the annual monitoring plan for product thickness and water level, and continuing all other monitoring as prescribed for the site. Meghan Dooley
5/20/2009 Update or Other Action The comments for the draft 2008 Annual Groundwater Monitoring Report were sent. General concerns include: adequacy of the MNA remedy and increasing contaminant levels, implementation of recommendations from the Petroleum Summary Report, effects of the March 2008 earthquake and documentation in the report, the monitoring well network, and the inclusion of useful photos. Meghan Dooley
8/21/2009 Update or Other Action The Final 2008 Annual Groundwater Monitoring Report was received on this date. The Navy recommends removing product thickness and groundwater elevation from well MW-E501 as elevation calculations cannot be made because the well was never surveyed. Meghan Dooley
3/12/2010 Update or Other Action The draft 2009 Annual Groundwater Monitoring Report was received on this date. The Navy recommends discontinuing monitoring of TEX in well MW-E006, discontinuing monitoring of GRO at surface water/sediment location 852, and maintaining an oil sorbent boom at the petroleum seep identified in 2009 on the shoreline of South Sweeper Creek. Meghan Dooley
4/15/2010 Update or Other Action Comments for the draft 2009 Annual Groundwater Monitoring Report were sent on this date. ADEC concurs with the recommendations, but notes that increasing levels of contaminants seem to be present in surface water and sediment. Meghan Dooley
5/27/2010 Update or Other Action The Draft SAP Additional Petroleum Characterization and figures were received Meghan Dooley
12/15/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 71665 Tank farm. Meghan Dooley
2/14/2011 Report or Workplan Review - Other The draft Site Characterization Report was received on December 30, 2010 and ADEC sent comments on February 14, 2011. Additional soil borings and 4 monitoring wells were installed to determine if contamination of DRO was migrating though groundwater into Sweeper Creek. DRO, TAH, TAqH, and benzene were detected in the wells above cleanup criteria. No recommendations were offered for this site. Meghan Dooley
2/16/2011 Report or Workplan Review - Other The draft 2010 IC Site Inspection Report was received on January 11, 2011 and DEC sent comments on February 16, 2011. There were no observed problems with ICs at this site. Meghan Dooley
5/10/2011 Site Characterization Report Approved The Final Site Characterization Report was received. The report recommends several changes in the long term monitoring program and initiating product recovery at well 653 on an annual basis. Meghan Dooley
5/12/2011 Report or Workplan Review - Other The Final 2010 IC Site Inspection Report was received by ADEC. ICs appear to be functioning as intended at this site. Meghan Dooley
6/27/2011 CERCLA ROD Periodic Review The draft Third 5-Year Review was received. The purpose of the 5-Year Review is to evaluate the effectiveness of the remedy and determine if further action is warranted to protect human health and the environment. The document listed actions taken to address issues from the previous 5-Year Review, and offered new recommendations based on data collected from 2006 to 2010 from Operable Units A and B-1. It concluded that the remedy is functioning as intended at all but 4 sites and provided the following area-wide recommendations: 1. Update the current Comprehensive Monitoring Plan, Institutional Control Monitoring Plan, Operation and maintenance Plan, 2. Update the document repositories, 3. Assess and update as necessary the Community Relations Plan, and 4. Address action items identified during 2010 site inspections. The 5-Year Review recommends that monitoring for DRO at well LC5A be discontinued, and monitoring for DRO, benzene, TAH and TAqH be initiated at wells 651, 652, and 650 where endpoints were exceeded. Surface water monitoring and groundwater monitoring at wells MW E006 and 852 are recommended to continue as prescribed. Meghan Dooley
7/11/2011 Report or Workplan Review - Other The Final 2010 Annual Groundwater Monitoring Report was received. As part of an additional site characterization effort, 4 new wells were installed at the site. THe report recommends including the newly installed wells (650, 651, 652, and 653) in the annual monitoring program and sampling for DRo, BTEX, and PAHs. Meghan Dooley
10/12/2012 Report or Workplan Review - Other Received Final 2011 Annual Groundwater Monitoring Report. Monthly Free product recovery has begun at the new wells installed at the site and will continue through September 2012. Due to the presence of the shoreline petroleum seep, presence of free product, and continued exceedances of endpoint criteria alternate remedies are being evaluted for this site. Guy Warren
4/5/2013 Report or Workplan Review - Other ADEC sent comments on the draft 2012 Annual Groundwater MOnitoring Report. ADEC concurs with reducing monitoring frequency at MW-E006, however is concerned about potential surface water quality issues near Sweeper Creek. Meghan Dooley
6/4/2013 Institutional Control Periodic Reporting The Final 2012 Institutional Control Site Inspection Report was received. There were no observed changes to land use and no indications of groundwater use or excavation activities. Signs were present. ICs appear to be functioning as intended. Meghan Dooley
9/8/2014 Report or Workplan Review - Other Received, Final 2013 Annual Groundwater and Landfill Monitoring Report for Adak Alaska. Benzene concentrations have been below endpoint criteria at well MW-E006 for two consecutive events, monitoring discontinued at this location. DRO, TAH and TAqH continue to exceed endpoint criteria in the vicinity of Sweeper Creek. Monitoring will continue as prescribed. Guy Warren
9/10/2014 Institutional Control Periodic Reporting The Final 2013 Institutional Control Site Inspection Report was received. There were no observed changes to land use and no indications of groundwater use or excavation activities. Signs were present. ICs appear to be functioning as intended. IC inspection frequency has been reduced to every odd year. Guy Warren
6/10/2015 Update or Other Action Received Final Annual Groundwater and Landfill Monitoring Report, 2014 Long Term Monitoring at OUA of the Former Adak Naval Complex. Surface water sampling at location 852 will be discontinued since endpoint criteria has not been exceeded in three years. Since concentrations of DRO, Benzene and TAH, and TAqH continue to exceed endpoint criteria and free product continues to occur in site wells monitoring and periodic product recovery will continue. Guy Warren
4/20/2016 Update or Other Action Submit approval letter to US Navy for “Annual Groundwater and Landfill Monitoring Report, 2015 Long Term Monitoring, Operable Unit A” for the former Adak Naval Station. Monitoring was conducted at three sites during 2015 including this one. Various contaminants continue to exceed endpoint criteria at site wells for multiple contaminants. It is recommended that the prescribed monitoring continue in 2016. In addition it recommends performing remedy evaluation to address the presence of free product and petroleum in sediment. Guy Warren
5/22/2017 Report or Workplan Review - Other The technical assessment conducted as part of the Fourth Five-Year Review identifies the MNA remedy as not functioning as intended at SWMU 60 due to surface water and sediment conditions in South Sweeper Creek and free product in groundwater adjacent to South Sweeper Creek.As a result of MNA not functioning at the site, this SSC is being initiated to facilitate evaluation and selection of a remedial action to supplement MNA. This SSC focuses on attempting to delineate the source area(s) contributing to groundwater plumes containing free product in the soil pore space including the groundwater plumes themselves, as well as source area(s) contributing to the surface water sheen present in South Sweeper Creek. Improving the understanding of these plumes and source area(s) will inform the remedial alternatives analysis (RAA) and will aid in the subsequent engineering evaluation / cost analysis (EE/CA) and eventual remedial design. The 2017 Sampling and Analysis Plan, Supplemental Site Characterization Activities, SWMU 60, Tank Farm A, May 2017 was approved. Darren Mulkey
7/16/2017 Site Visit ADEC completed a three day site visit to Adak NAVFAC. All active sites were visited and current status discussed at length with NAVFAC representatives. Current field work activities were observed and noted. Work plan activities were proceeding as scheduled. No work plan deviations were evident. Darren Mulkey

Contaminant Information

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

Control Type

Type Details
Equitable Servitude The Equitable Servitude to the Interim Conveyance Document restricts residential land use.
Institutional Control Management Plan The Institutional Control Management Plan, a supbart of the base-wide Comprehensive Monitoring Plan, requires the completion of a dig notification in the Downtown Area and at several outback locations.

Requirements

Description Details
Restricted to Industrial / Commercial Land Use Equitable servitude restricts land uses to non-residential uses. Site is inspected and reported yearly to ensure there are no residential land uses taking place.
Excavation / Soil Movement Restrictions All excavation must be submitted to the City of Adak and the Navy for review three days prior to excavation. Annual report of excavation notifications included in the IC Inspection Report.
Groundwater Monitoring The Comprehensive Monitoring Plan Rev. 2 requires annual groundwater monitoring for this site. Groundwater is sampled yearly for various parameters.

There are no documents for this site report.

Missing Location Data

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