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:	Jamie McKellar, 9074515175 jamie.mckellar@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.

Site Chronology
IC / Closure Details
Documents
Associated Sites

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.	Former Staff
9/29/1992	Site Number Identifier Changed	Region portion of Reckey number changed to consolidate district 26 into 25.	Former Staff
1/1/1994	Update or Other Action	Site included in State-Navy two-party SAERA agreement for petroleum sites.	Former Staff
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.	Former Staff
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	Document, Report, or Work plan 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	Document, Report, or Work plan 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	Document, Report, or Work plan 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	Document, Report, or Work plan 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	Document, Report, or Work plan 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	Document, Report, or Work plan 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	Document, Report, or Work plan 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	Document, Report, or Work plan 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
4/2/2018	CERCLA Remedial Design/Remedial Action Plan Approved	A EE/CA was approved for SWMU 60 Tank Farm A. Alternative 6a is an optimization of the current remedy. It involves application of wind-assisted passive bioventing throughout the soil TTZ to increase the rate of hydrocarbon biodegradation and construction of an OBB at the GSI. Alternative 6a is anticipated to be the most effective alternative of the active alternatives evaluated and will provide a high degree of long-term effectiveness, reduction in toxicity, mobility, and volume (TMV), and short term effectiveness. The RAOs to prevent free product migration to surface water and minimize exposure to free product in soil, groundwater, and surface water will be met upon completion of construction, because of the installation of the OBB and continued ICs. Installation of the bioventing system in the soil TTZ will also increase the rate of biodegradation of COCs over MNA alone and reduce reliance on the OBB, which is an emerging technology. Alternative 6a is also one of the most implementable alternatives and will avoid disturbance or critical underground utilities. The estimated total present worth of Alternative 6a is $3,283,000 which falls well below Alternatives 4a, 4b, and 4c, and is in the same range as Alternatives 3, 5, and 6b.	Darren Mulkey
5/23/2018	Site Characterization Report Approved	Annual Groundwater and Landfill Monitoring Report, 2017 Long-Term Monitoring, Operable Unit A was finalized. Natural attenuation of petroleum hydrocarbons has been demonstrated on Adak. As a result, the CMP, Revision 6 (Navy 2014) prescribed natural attenuation parameter (NAP) monitoring once every 5 years. This monitoring was last conducted in 2014 at all MNA sites.	Darren Mulkey
9/13/2018	Document, Report, or Work plan Review - other	Approved the 2019 Final Operation and Maintenance Plan, Free Product Recovery, Operation and Maintenance, Former Naval Complex, Adak, AK 8 August, 2018. O&M activities related to free product fuel recovery at six sites: Solid Waste Management Unit (SWMU) 62, New Housing Fuel Leak Area; Former Power Plant, Building T-1451; Naval Mobile Construction Battalion (NMCB) Expanded Area; Source Area (SA) 80, Steam Plant 4; South of Runway 18-36 Area; and SWMU 60, Tank Farm A. Oil-sorbent boom maintenance activities (for protection of surface waters) at selected locations in East Canal and South Sweeper Creek.	Darren Mulkey
10/24/2018	Document, Report, or Work plan Review - other	Reviewed and approved Adak Comprehensive Monitoring Plan Revision 7, Operable Unit A. All LTM sites are updated for ground and surface water monitoring.	Darren Mulkey
3/5/2019	Document, Report, or Work plan Review - other	Received the Final Sampling and Analysis Plan Proof of Concept Testing SWMU 60 - Tank Farm A Adjacent to South Sweeper Creek, Former Adak Naval Complex, Adak, Alaska, dated 13 February 2019. The plan outlines the installation of an oleophylic bio-barrier to eliminate and treat the sheen that daylights in South Sweeper Creek.	Darren Mulkey
3/6/2019	Document, Report, or Work plan Review - other	During the 2018 monitoring event, groundwater, surface water, and sediment samples were collected from 123 monitoring locations at 19 sites. Product thickness and depth to water measurements were performed at 159 locations from these sites. Monitoring was conducted to satisfy Operable Unit A Record of Decision (Navy, ADEC, and EPA 2000) remedy requirements and subsequent to free product recovery remedy requirements that were established under the State-Adak Environmental Restoration Agreement (Navy and ADEC 1994). Monitoring was conducted to assess the remedies of monitored natural attenuation, limited groundwater monitoring, surface water protection, and compliance. Based on the previous monitoring results, the monitored natural attenuation remedies appear to be effective and biodegradation appears to be occurring to varying degrees at all of the monitored natural attenuation sites (Navy 2017). Monitoring for natural attenuation parameters has been reduced from annually to every 4 to 6 years to coincide with the next 5-year review, and was conducted in 2018. DRO, TAH, and TAqH have continued to exceed endpoint criteria in various site wells and sediment. Additionally, free product continues to be observed in site wells, although at a reduced volume and frequency. Because of this, it is recommended that the prescribed monitoring continue in 2019, and that three new wells (656, 657, and 658) installed in 2017 as part of the site investigation, be added to the monitoring schedule and analyzed for DRO, TAH, and TAqH.	Darren Mulkey
12/30/2019	Document, Report, or Work plan Review - other	Draft 2019 Remedial Action Summary Report, Free Product Recovery, SWMU 62 New Housing Fuel Leak Area and Additional Sites, Former Naval Complex, Adak, Alaska, December 11, 2019. This report summarizes the monitoring and remedial action activities completed during the period from October 2018 through September 2019 and whether endpoint criteria were achieved as established by the United States Navy, United States Environmental Protection Agency, and Alaska Department of Environmental Conservation in Records of Decision. During monthly free product recovery activities for the reporting period, a total of 3.24 gallons of free product were recovered from monitoring wells at Solid Waste Management Unit 62, New Housing Fuel Leak Area (Eagle Bay Housing). During the reporting period, measurable free product was recovered from four of the monitoring wells. The site has currently achieved the Operable Unit A Record of Decision practical endpoint for a passive recovery system as a result of the 2016 removal action conducted by the Navy, which removed the recovery trench, recovery sumps, petroleum-impacted soil, and accumulated product adjacent to East Canal. The monthly volume of recovered product, averaged over the most recent 6 months (6-month moving average), remained below 5 gallons per month since January 2016, and remained below the endpoint criteria for the entire reporting period. However, the requirement for the occurrence of product in the replacement monitoring wells has not met the remedial objective of less than 0.01 foot for a 1-year period. In two of the removal action monitoring wells, product was observed at greater than the Record of Decision endpoint of 0.01 foot from October 2018 through September 2019. During the free product recovery activities for the reporting period, a total of 10.33 gallons of free product were recovered from monitoring wells at five additional petroleum sites: Former Power Plant, Building T-1451; Naval Mobile Construction Battalion Building T- 1416 Expanded Area; Source Area 80, Steam Plant 4; South of Runway 18-36 Area; and Solid Waste Management Unit 60, Tank Farm A. At the request of the Alaska Department of Environmental Conservation, free product monitoring and recovery is conducted at select wells at these sites, which do not have defined specific endpoint criteria for free product.	Darren Mulkey
4/16/2020	Document, Report, or Work plan Review - other	Groundwater, surface water, and sediment samples were collected from 40 monitoring locations at 4 sites during the 2019 monitoring event. In addition, product thickness and depth to water measurements were performed at 50 locations from these sites. Monitoring was conducted to satisfy OU A Record of Decision (Navy, ADEC, and EPA 2000) remedy requirements as well as free product recovery remedy requirements that were established under the State-Adak Environmental Restoration Agreement (Navy and ADEC 1994). Monitoring was conducted to assess the remedies of monitored natural attenuation, limited groundwater monitoring, surface water protection, and compliance. Based on the previous monitoring results, the monitored natural attenuation remedies appear to be effective and biodegradation appears to be occurring to varying degrees at all of the monitored natural attenuation sites (Navy 2019a). Monitoring for natural attenuation parameters has been reduced from annually to every 4 to 6 years to coincide with the next 5-year review, and was last conducted in 2018.	Darren Mulkey
1/10/2022	Document, Report, or Work plan Review - other	"Final Remedial Action Summary Report, Free Product Recovery, SWMU 62 New Housing Fuel Leak Area and Additional Sites, Former Naval Complex, Adak, Alaska, 21 December 2021". During periodic free product recovery activities for the reporting period, a total of 2.15 gallons of free product were recovered from monitoring wells at Solid Waste Management Unit (SWMU) 62, New Housing Fuel Leak Area (Eagle Bay Housing). During the reporting period, measurable free product was recovered from three of the monitoring wells. The site has currently achieved the Operable Unit (OU) A Record of Decision (ROD) practical endpoint for a passive recovery system as a result of the 2016 removal action conducted by the Navy, which removed the recovery trench, recovery sumps, petroleum-impacted soil, and accumulated product adjacent to East Canal. The volume of recovered product, averaged over the most recent six months (six-month moving average), remained below five gallons per month since January 2016, and remained below the endpoint criteria for the entire reporting period. However, the requirement for the occurrence of product in the replacement monitoring wells has not met the remedial objective of less than 0.01 foot for a one-year period (Navy 2006). In one of the removal action monitoring wells, product was observed at greater than the ROD endpoint of 0.01 foot from October 2020 through September 2021.	Darren Mulkey
1/10/2022	Document, Report, or Work plan Review - other	This O&M Plan defines the free product recovery activities at the sites for the contract year (CY) from October 2021 through September 2022. The plan incorporates information obtained from past remedial action and long-term monitoring (LTM) reports. This plan also incorporates recommendations provided in Focused Feasibility Studies (FFS) for the NMCB Building T-1416 Expanded Area and SWMU 62, New Housing Fuel Leak Area, Eagle Bay Housing (Department of the Navy [DON] 2005a and 2005b); recommendations from past Annual Remedial Action Summary Reports for Free Product Recovery; and the U.S. Navy (Navy) scope of work for this contract.	Darren Mulkey
8/9/2024	Long Term Monitoring Workplan or Report Review	WASTE MANAGEMENT PLAN APPROVED: Final Waste Management Plan 2024 Long-Term Monitoring at Operable Unit A and 2024 Waste Management Plan Addendum (via email).	Jamie McKellar
8/21/2024	Site Visit	CS staff conducted site visits and attended a Regional Advisory Board (RAB) meeting on Adak Island. During the trip, CS staff and representatives from the US Navy also participated in a “RAB Field Day” organized by a RAB member who wanted to highlight some issues of concern - petroleum contamination at Sweeper Creek, the spillway at Lake Andrew, and munitions concerns in Parcel 4. While on the island, CS staff also met with contractors conducting PFAS sampling and long-term monitoring activities, and CS staff attended a community meeting hosted by the Aleut Corporation (TAC) and its contractor to discuss the community’s Brownfields Community Wide Assessment Grant.	Jamie McKellar
9/6/2024	Document, Report, or Work plan Review - other	REPORTS APPROVED: 1st and 2nd quarter 2024 Final Technical Memorandum Oleophilic Biobarrier (OBB) Pilot Test, AECOM Technical Services, Inc.	Jamie McKellar

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.

Former Staff

9/29/1992

Site Number Identifier Changed

Region portion of Reckey number changed to consolidate district 26 into 25.

Former Staff

1/1/1994

Update or Other Action

Site included in State-Navy two-party SAERA agreement for petroleum sites.

Former Staff

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.

Former Staff

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

Document, Report, or Work plan 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

Document, Report, or Work plan 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

Document, Report, or Work plan 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

Document, Report, or Work plan 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

Document, Report, or Work plan 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

Document, Report, or Work plan 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

Document, Report, or Work plan 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

Document, Report, or Work plan 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

4/2/2018

CERCLA Remedial Design/Remedial Action Plan Approved

A EE/CA was approved for SWMU 60 Tank Farm A. Alternative 6a is an optimization of the current remedy. It involves application of wind-assisted passive bioventing throughout the soil TTZ to increase the rate of hydrocarbon biodegradation and construction of an OBB at the GSI. Alternative 6a is anticipated to be the most effective alternative of the active alternatives evaluated and will provide a high degree of long-term effectiveness, reduction in toxicity, mobility, and volume (TMV), and short term effectiveness. The RAOs to prevent free product migration to surface water and minimize exposure to free product in soil, groundwater, and surface water will be met upon completion of construction, because of the installation of the OBB and continued ICs. Installation of the bioventing system in the soil TTZ will also increase the rate of biodegradation of COCs over MNA alone and reduce reliance on the OBB, which is an emerging technology. Alternative 6a is also one of the most implementable alternatives and will avoid disturbance or critical underground utilities. The estimated total present worth of Alternative 6a is $3,283,000 which falls well below Alternatives 4a, 4b, and 4c, and is in the same range as Alternatives 3, 5, and 6b.

Darren Mulkey

5/23/2018

Site Characterization Report Approved

Annual Groundwater and Landfill Monitoring Report, 2017 Long-Term Monitoring, Operable Unit A was finalized. Natural attenuation of petroleum hydrocarbons has been demonstrated on Adak. As a result, the CMP, Revision 6 (Navy 2014) prescribed natural attenuation parameter (NAP) monitoring once every 5 years. This monitoring was last conducted in 2014 at all MNA sites.

Darren Mulkey

9/13/2018

Document, Report, or Work plan Review - other

Approved the 2019 Final Operation and Maintenance Plan, Free Product Recovery, Operation and Maintenance, Former Naval Complex, Adak, AK 8 August, 2018. O&M activities related to free product fuel recovery at six sites: Solid Waste Management Unit (SWMU) 62, New Housing Fuel Leak Area; Former Power Plant, Building T-1451; Naval Mobile Construction Battalion (NMCB) Expanded Area; Source Area (SA) 80, Steam Plant 4; South of Runway 18-36 Area; and SWMU 60, Tank Farm A. Oil-sorbent boom maintenance activities (for protection of surface waters) at selected locations in East Canal and South Sweeper Creek.

Darren Mulkey

10/24/2018

Document, Report, or Work plan Review - other

Reviewed and approved Adak Comprehensive Monitoring Plan Revision 7, Operable Unit A. All LTM sites are updated for ground and surface water monitoring.

Darren Mulkey

3/5/2019

Document, Report, or Work plan Review - other

Received the Final Sampling and Analysis Plan Proof of Concept Testing SWMU 60 - Tank Farm A Adjacent to South Sweeper Creek, Former Adak Naval Complex, Adak, Alaska, dated 13 February 2019. The plan outlines the installation of an oleophylic bio-barrier to eliminate and treat the sheen that daylights in South Sweeper Creek.

Darren Mulkey

3/6/2019

Document, Report, or Work plan Review - other

During the 2018 monitoring event, groundwater, surface water, and sediment samples were collected from 123 monitoring locations at 19 sites. Product thickness and depth to water measurements were performed at 159 locations from these sites. Monitoring was conducted to satisfy Operable Unit A Record of Decision (Navy, ADEC, and EPA 2000) remedy requirements and subsequent to free product recovery remedy requirements that were established under the State-Adak Environmental Restoration Agreement (Navy and ADEC 1994). Monitoring was conducted to assess the remedies of monitored natural attenuation, limited groundwater monitoring, surface water protection, and compliance. Based on the previous monitoring results, the monitored natural attenuation remedies appear to be effective and biodegradation appears to be occurring to varying degrees at all of the monitored natural attenuation sites (Navy 2017). Monitoring for natural attenuation parameters has been reduced from annually to every 4 to 6 years to coincide with the next 5-year review, and was conducted in 2018. DRO, TAH, and TAqH have continued to exceed endpoint criteria in various site wells and sediment. Additionally, free product continues to be observed in site wells, although at a reduced volume and frequency. Because of this, it is recommended that the prescribed monitoring continue in 2019, and that three new wells (656, 657, and 658) installed in 2017 as part of the site investigation, be added to the monitoring schedule and analyzed for DRO, TAH, and TAqH.

Darren Mulkey

12/30/2019

Document, Report, or Work plan Review - other

Draft 2019 Remedial Action Summary Report, Free Product Recovery, SWMU 62 New Housing Fuel Leak Area and Additional Sites, Former Naval Complex, Adak, Alaska, December 11, 2019. This report summarizes the monitoring and remedial action activities completed during the period from October 2018 through September 2019 and whether endpoint criteria were achieved as established by the United States Navy, United States Environmental Protection Agency, and Alaska Department of Environmental Conservation in Records of Decision. During monthly free product recovery activities for the reporting period, a total of 3.24 gallons of free product were recovered from monitoring wells at Solid Waste Management Unit 62, New Housing Fuel Leak Area (Eagle Bay Housing). During the reporting period, measurable free product was recovered from four of the monitoring wells. The site has currently achieved the Operable Unit A Record of Decision practical endpoint for a passive recovery system as a result of the 2016 removal action conducted by the Navy, which removed the recovery trench, recovery sumps, petroleum-impacted soil, and accumulated product adjacent to East Canal. The monthly volume of recovered product, averaged over the most recent 6 months (6-month moving average), remained below 5 gallons per month since January 2016, and remained below the endpoint criteria for the entire reporting period. However, the requirement for the occurrence of product in the replacement monitoring wells has not met the remedial objective of less than 0.01 foot for a 1-year period. In two of the removal action monitoring wells, product was observed at greater than the Record of Decision endpoint of 0.01 foot from October 2018 through September 2019. During the free product recovery activities for the reporting period, a total of 10.33 gallons of free product were recovered from monitoring wells at five additional petroleum sites: Former Power Plant, Building T-1451; Naval Mobile Construction Battalion Building T- 1416 Expanded Area; Source Area 80, Steam Plant 4; South of Runway 18-36 Area; and Solid Waste Management Unit 60, Tank Farm A. At the request of the Alaska Department of Environmental Conservation, free product monitoring and recovery is conducted at select wells at these sites, which do not have defined specific endpoint criteria for free product.

Darren Mulkey

4/16/2020

Document, Report, or Work plan Review - other

Groundwater, surface water, and sediment samples were collected from 40 monitoring locations at 4 sites during the 2019 monitoring event. In addition, product thickness and depth to water measurements were performed at 50 locations from these sites. Monitoring was conducted to satisfy OU A Record of Decision (Navy, ADEC, and EPA 2000) remedy requirements as well as free product recovery remedy requirements that were established under the State-Adak Environmental Restoration Agreement (Navy and ADEC 1994). Monitoring was conducted to assess the remedies of monitored natural attenuation, limited groundwater monitoring, surface water protection, and compliance. Based on the previous monitoring results, the monitored natural attenuation remedies appear to be effective and biodegradation appears to be occurring to varying degrees at all of the monitored natural attenuation sites (Navy 2019a). Monitoring for natural attenuation parameters has been reduced from annually to every 4 to 6 years to coincide with the next 5-year review, and was last conducted in 2018.

Darren Mulkey

1/10/2022

Document, Report, or Work plan Review - other

"Final Remedial Action Summary Report, Free Product Recovery, SWMU 62 New Housing Fuel Leak Area and Additional Sites, Former Naval Complex, Adak, Alaska, 21 December 2021". During periodic free product recovery activities for the reporting period, a total of 2.15 gallons of free product were recovered from monitoring wells at Solid Waste Management Unit (SWMU) 62, New Housing Fuel Leak Area (Eagle Bay Housing). During the reporting period, measurable free product was recovered from three of the monitoring wells. The site has currently achieved the Operable Unit (OU) A Record of Decision (ROD) practical endpoint for a passive recovery system as a result of the 2016 removal action conducted by the Navy, which removed the recovery trench, recovery sumps, petroleum-impacted soil, and accumulated product adjacent to East Canal. The volume of recovered product, averaged over the most recent six months (six-month moving average), remained below five gallons per month since January 2016, and remained below the endpoint criteria for the entire reporting period. However, the requirement for the occurrence of product in the replacement monitoring wells has not met the remedial objective of less than 0.01 foot for a one-year period (Navy 2006). In one of the removal action monitoring wells, product was observed at greater than the ROD endpoint of 0.01 foot from October 2020 through September 2021.

Darren Mulkey

1/10/2022

Document, Report, or Work plan Review - other

This O&M Plan defines the free product recovery activities at the sites for the contract year (CY) from October 2021 through September 2022. The plan incorporates information obtained from past remedial action and long-term monitoring (LTM) reports. This plan also incorporates recommendations provided in Focused Feasibility Studies (FFS) for the NMCB Building T-1416 Expanded Area and SWMU 62, New Housing Fuel Leak Area, Eagle Bay Housing (Department of the Navy [DON] 2005a and 2005b); recommendations from past Annual Remedial Action Summary Reports for Free Product Recovery; and the U.S. Navy (Navy) scope of work for this contract.

Darren Mulkey

8/9/2024

Long Term Monitoring Workplan or Report Review

WASTE MANAGEMENT PLAN APPROVED: Final Waste Management Plan 2024 Long-Term Monitoring at Operable Unit A and 2024 Waste Management Plan Addendum (via email).

Jamie McKellar

8/21/2024

Site Visit

CS staff conducted site visits and attended a Regional Advisory Board (RAB) meeting on Adak Island. During the trip, CS staff and representatives from the US Navy also participated in a “RAB Field Day” organized by a RAB member who wanted to highlight some issues of concern - petroleum contamination at Sweeper Creek, the spillway at Lake Andrew, and munitions concerns in Parcel 4. While on the island, CS staff also met with contractors conducting PFAS sampling and long-term monitoring activities, and CS staff attended a community meeting hosted by the Aleut Corporation (TAC) and its contractor to discuss the community’s Brownfields Community Wide Assessment Grant.

Jamie McKellar

9/6/2024

Document, Report, or Work plan Review - other

REPORTS APPROVED: 1st and 2nd quarter 2024 Final Technical Memorandum Oleophilic Biobarrier (OBB) Pilot Test, AECOM Technical Services, Inc.

Jamie McKellar

Contaminant Information

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

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.

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.

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.

Hazard ID	Site Name	File Number
27909	Adak Island OU A, B1, & B2	2501.38.007.01

Hazard ID

Site Name

File Number

27909

Adak Island OU A, B1, & B2

2501.38.007.01

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Site Report: Adak SWMU 60 Tank Farm A

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

Missing Location Data

State of Alaska Department of Environmental Conservation