| Action Date |
Action |
Description |
DEC Staff |
| 3/14/1986 |
Update or Other Action |
Environmental Assessment, Defense Environmental Restoration Account (dated March 14, 1986). |
Former Staff |
| 1/15/1987 |
Update or Other Action |
Defense Environmental Restoration Program (DERP) Inventory Project Report (January 1987). |
Former Staff |
| 7/13/1994 |
Preliminary Assessment Approved |
Preliminary Assessment (dated January 1994) prepared by CH2M Hill; received on July 13, 1994. |
Ray Burger |
| 5/25/1995 |
Document, Report, or Work plan Review - other |
Staff commented on the draft work plan (site investigation, sampling and analysis plan, quality assurance plan). Staff commented that 3 soil samples along a 3 mile long pipeline is insufficient to come to any conclusion regarding the contamination present or absent at the pipeline. Historically reported areas of contamination were found but the location is unknown and useless for directing current field efforts. Limited sampling (one sample) from doorways, landfills will not likely produce any data to lead to any kind of decision. Soil sample locations should be from original grade since many areas have been regarded during past remedial actions.
See site file for additional information. |
Ray Burger |
| 2/8/1996 |
Update or Other Action |
Final Preliminary Assessment / Site Inspection (dated January 1996) prepared by EMCON; received February 8, 1996. |
Ray Burger |
| 2/23/1996 |
Update or Other Action |
Final Management Action Plan (MAP) dated February 1996; received February 23, 1996. |
Ray Burger |
| 12/29/1997 |
Update or Other Action |
Management Action Plan (draft dated August 1997; ADEC comment letter dated December 10, 1997; final report dated Decmber 29, 1997). |
Gretchen Pikul |
| 1/9/1998 |
Site Added to Database |
Site added by staff. |
Gretchen Pikul |
| 7/26/2005 |
Update or Other Action |
Preliminary Assessment/Site Investigation Quality Program Plan (Work Plans) for Driftwood Bay RRS (entire installation) and Duncan Canal RRS; draft dated March 2005, ADEC received on March 25; ADEC comment letter on April 29; comment resolution meeting on May 3; Air Force final PA/SI QPP dated June 2005 received on July 26. |
Jeff Norberg |
| 2/17/2006 |
Update or Other Action |
Preliminary Assessment/Site Investigation Report for Driftwood Bay RRS for entire installation; draft dated October 2005 received on October 19; ADEC comment letter on November 23; Air Force response to comments received electronically December 15; ADEC approval letter issued December 19, 2005; Final PA/SI report dated December 2005 received February 17, 2006. |
Jeff Norberg |
| 7/21/2006 |
Meeting or Teleconference Held |
Stakeholders met for a 3-day Triad Systematic Planning meeting between July 18 and July 20, 2006 to discuss plans to address residual contamination at the former Driftwood Bay RRS facility. The primary purpose of this meeting was to reach an understanding of data quality objectives for each site at Driftwood Bay for eventual site closure and land transfer. Several sites identified as petroleum only, will be investigated in accordance with Alaska State regulations. The investigation and closure for remaining sites will comply with the Comprehensive Environmental Response, Compensation, and Liability Act. |
Jeff Norberg |
| 7/26/2007 |
Update or Other Action |
DEC received a copy of a letter from EPA to the Air Force documenting EPA';s decision of No Further Remedial Action Planned under EPA's Superfund Program. This decision does not preclude any further action at the site by another EPA program, the State or other Federal agency.
EPA's NERAP designation does not relieve your facility from complying with appropriate Alaska state regulations. The Superfund Amendments and Reauthorization Act (SARA) of 1986, Section 120(a)(4) requires federal facilities to comply with state cleanup requirements and standards when not listed on the NPL. |
John Halverson |
| 9/18/2007 |
Update or Other Action |
Workplan (WP) approval requirements & quality assurance oversight on Performance Based Contracts (PBCs) letter from John Halverson (ADEC) to Scott Hansen (611 CES). ADEC is writing to remind you of contaminated site WP approval requirements in AK’s oil & hazardous substance pollution control regulations & UST regulations. Additionally, ADEC is concerned over quality assurance on PBCs.
WP Approval-Several 611 CES environmental restoration projects were implemented this summer without obtaining prior WP approval from DEC. The site cleanup rules require ADEC approval on WPs before beginning interim removal actions (18 AAC 75.330), site characterization work (18 AAC 75.355), or cleanup operations (18 AAC 75.360). Similarly, the UST regulations specify ADEC may require a corrective action plan be submitted for approval prior to conducting corrective action at an UST release site (18 AAC 78.250).
ADEC staff strives to complete plan reviews & respond to responsible parties within thirty (30) days after receipt of plans, although this is not always possible nor is it a requirement. At times expedited plan reviews are feasible based on project manager work load, adequate up-front planning, & contractors providing complete, well written plans. However, if significant WP revisions are required, additional review & comment resolution time will be needed. To facilitate successful project implementation, I recommend DoD project managers & contracting staff:
• Coordinate schedules with DEC project managers in advance & throughout projects.
• Include DEC project managers in project planning meetings (DQO meetings, UFP QAPP development meetings, Triad & other Technical Project Planning team meetings, etc.).
• Plan & maintain project schedules that include a sixty (60) days for reviewing draft work plans, comment resolution, any necessary revisions & a final review & approval.
• Review contractor planning documents prior to submission to DEC to ensure compliance with state & federal regulations consistency with agreements made during project planning meetings.
Failure to obtain WP approval before implementing site work described above is considered a violation of AK regulations & may result in field work not being approved or additional work being required & may subject responsible parties &/or contractors to a Notice of Violation (NOV).
Independent QA oversight on PBCs-As DoD transitions more ER projects to PBC concerns have risen regarding the level of Quality Assurance (QA) oversight. The site cleanup rules require that “collection, interpretation, & reporting of data, & the required sampling & analysis is conducted or supervised by a qualified, impartial third party”.
Depending upon the specific terms in a PBC, a contractor may no longer be considered an impartial third party with respect to collecting, interpreting & reporting data. This should be taken into consideration when preparing scopes of work. DEC strongly recommends the Air Force provide an on-site Quality Assurance (QA) Representative or a third party QA oversight contractor to monitor fieldwork for consistency with approved plans & contract requirements.
DEC is beginning to conduct more frequent independent QA site inspections to evaluate conformance to approved work plans & regulatory compliance. Because we lack staff resources to conduct independent QA on all of the anticipated PBC projects, we intend to include contracting support for field QA oversight in the DSMOA Joint Execution Plans & budget. |
John Halverson |
| 2/22/2008 |
Site Characterization Report Approved |
Contaminated Sites staff reviewed a site characterization report for the Driftwood Bay Radio Relay Station. The site had an upper site where the bill board antennae and composite building were located. The lower camp area contained the support facilities such as the airstrip and fuel tank farm. Several areas have contamination over method 2 cleanup levels. A risk assessment is being done to assess pathways and risk for those areas. The report had quality assurance problems with lab analytical data mostly concerning spiking errors for the surrogates in volatiles |
Jeff Brownlee |
| 3/20/2008 |
Meeting or Teleconference Held |
Contaminated Sites staff met with the Air Force 611 and their contractor on the Driftwood Bay Long Range Radar Site. The meeting was to discuss comments on the draft site characterization report. All issues were resolved with exception of how to flag volatile organic carbon data with surrogate quality control errors. The contractor made a good argument that the data shouldn’t be rejected; however the state is bound by the National Functional Guidelines for data criteria. We will continue discussion whether the Air Force can use a modified flag so the data can still be used as a screening tool |
Jeff Brownlee |
| 4/3/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Jeff Brownlee |
| 7/17/2008 |
Document, Report, or Work plan Review - other |
Staff reviewed and commented on a draft Remedial Investigation (RI) Report for the Driftwood Bay Radio Relay Station. The Air Force 611th is producing separate documents for the CERCLA concerns and petroleum impacts at the site. The RI applies to three sites containing lead and PCB contamination. Future negotiation will determine if the sites are cleaned up or risked |
Jeff Brownlee |
| 12/19/2008 |
Meeting or Teleconference Held |
Contaminated Sites staff participated in a comment meeting on the draft risk assessment for the former Driftwood Bay Radio Relay Station. There is ecological risk for various species at three sites from lead and Polycyclic Aromatic Hydrocarbons (PAHs) well over acceptable state risk levels. One site is a landfill where ash was sampled from a test pit. One site is a former POL tank farm near the coast and another site is an electronic debris area with elemental lead from battery carcasses on the ground surface |
Jeff Brownlee |
| 4/7/2009 |
Meeting or Teleconference Held |
Staff participated in a comment resolution meeting for an interim remedial action at the former Driftwood Bay Radio Relay Station. Lead levels in soil at the Electronic Debris Area are well over human health risk levels. The Air Force is proposing using a phosphate based chemical binder to reduce the bioavailability of the lead in soil to below hazardous waste levels. A final remedy will be decided at a later time |
Jeff Brownlee |
| 5/8/2009 |
Site Characterization Report Approved |
Contaminated Sites staff reviewed and commented on revised draft documents for the Driftwood Bay former Radio Relay Station on Unalaska Island about 15 miles from Dutch Harbor. The Air Force 611th has performed a remedial investigation/site characterization and risk assessment for the site. Risk associated with lead in soil at two sites is over state human health and ecological standards. The site will require institutional controls for a landfill and petroleum contamination in soil and groundwater. Future remedial action and further investigation is anticipated for the site |
Jeff Brownlee |
| 5/8/2009 |
Risk Assessment Report Approved |
Contaminated Sites staff reviewed and commented on revised draft documents for the Driftwood Bay former Radio Relay Station on Unalaska Island about 15 miles from Dutch Harbor. The Air Force 611th has performed a remedial investigation/site characterization and risk assessment for the site. Risk associated with lead in soil at two sites is over state human health and ecological standards. The site will require institutional controls for a landfill and petroleum contamination in soil and groundwater. Future remedial action and further investigation is anticipated for the site |
Jeff Brownlee |
| 7/29/2009 |
Update or Other Action |
Memo for findings of additional investigative activities at the Driftwood Bay RRS
Electronic Debris Area.
During execution of the Work Plan, an additional site, the Electronic Debris Area, was discovered. The Draft Driftwood Bay RRS Remedial Investigation Report presents details of contamination that was found and actions taken to minimize risk associated with site contaminants.
The purpose of this memorandum is to summarize additional data gathering activities conducted
in May 2009 to improve the accuracy of the risk assessment for the Electronic Debris Area,
evaluate a potential remedial technology, and incidentally help address risk associated with
lead-contaminated soil. All fieldwork was conducted in accordance with the Technical
Memorandum work plan (USAF 2009c). The field effort included the following activities:
*In situ testing of the ability of calcium hydroxyapatite (EcoBond) to reduce the bioavailability
and solubility of lead contamination at the Electronic Debris Area
* Effectiveness testing of the calcium hydroxyapatite treatment using the newly available U.S.
Environmental Protection Agency (EPA)-approved in vitro method to assess lead
bioavailability (EPA 2007)
* Limited removal and additional sampling of a "hot spot" that was found beneath a removed
battery
Similarly, limited removal and additional sampling was conducted at locations beneath three
individual battery disposal locations at nearby site LFOO6.
Limited hot-spot removal was conducted at four previous battery locations; however, elevated
concentrations of lead remain above ADEC Method Two standards. The extent of lead
contamination is larger than previously believed.
EcoBond application significantly reduced TCLP results, indicating if soil at the distressed area
of the Electronic Debris Area were generated as a waste, it could be categorized as nonhazardous for disposal. Baseline bioaccessibility at the site is below the default value of 60 percent. Following EcoBond application, the bioaccessibility was reduced sufficiently to reduce, but not eliminate, risk for adult exposure to lead at the site.
See site file for additional information.
|
John Halverson |
| 9/11/2009 |
Update or Other Action |
In 1991, the US Army Corps of Engineers, under the Formerly Used Defense Site (FUDS) Program, contracted with Anderson Excavating and Wrecking Company to demolish buildings and cleanup solid wastes at the site. The composite building, POL pump building, airport storage building, ammunition building, water pump house, lighting vault, four billboard antennas and other wastes were demolished and buried in an on-site landfill south of the former composite building. Concrete foundations were left in place. The Corps hired Environmental Management to remove the above and underground fuel storage tanks and pipelines, which were cut up and disposed in the on-site landfill. A total of 350 55-gallon drums were removed. Fuel contaminated soil was excavated, thermally treated and disposed of in the landfill. A 55-gallon drum of PCB and a drum containing lead acid batteries were removed from the site for proper disposal. Subsequently, it was determined that the Air Force still controls the site as the public land withdrawl has not been relinquished. Further cleanup work on the site is not eligible under the FUDS Program.
DEC and the Corps have signed a Containerized / Hazardous, Toxic or Radiologiacl Waste (CON/HTRW) Project Closeout Report (Aug. 2009) documenting no additional CON/HTRW work is eligible under the FUDS Program. The USAF is responsible for remaining environmental restoration work at the site. |
John Halverson |
| 11/6/2009 |
Meeting or Teleconference Held |
Contaminated sites staff participated in an update meeting with project managers from the USAF 611th and their contractor. Discussion included the proposed timeline and scope of work for the 2010 and 2011 field seasons for installing monitoring wells and institutional controls at 4 POL sites and the status of 8 other sites (5 are proposed to be DEC-determined as cleanup complete with no further action; 3 sites are being addressed under CERCLA). |
Curtis Dunkin |
| 2/2/2010 |
Document, Report, or Work plan Review - other |
Contaminated sites staff reviewed and approved the USAF 611th’s request for ADEC to make a determination of cleanup complete with no further action for a sub site of LF006 named 'Heavy Equipment Storage Area'(HESA). The HESA portion of the LF006 site involved only POL contaminants and was addressed solely under 18AAC75. ADEC determination was based on alternative migration to groundwater soil cleanup levels of 1.6 mg/kg pentachlorophenol and 8,000 mg/kg DRO. |
Curtis Dunkin |
| 2/17/2010 |
Document, Report, or Work plan Review - other |
Contaminated sites staff reviewed and approved the USAF 611th’s request to include a small, previously undiscovered electronic debris area (EDA) into the LF006 site. The EDA was discovered during LF006 site characterization activities in 2007. Batteries, audio transformers, capacitors and associated debris were collected in 2007 to remove potential point sources of contamination. Contaminants of concern for this area include lead and PCB’s. Cleanup for both the LF006 and EDA are being addressed under CERCLA. |
Curtis Dunkin |
| 7/17/2010 |
Site Visit |
Contaminated sites staff conducted site visits and observations of field work and soil screening and sampling being conducted by the U.S. Air Force 611th and their contractor. Travel to the site was via boat out of Dutch Harbor, Alaska. The primary purpose of this mobilization was to conduct soil screening and sampling (incl. TCLP) to address data gaps associated with two areas within the LF006 site where soil is contaminated with lead at levels ranging between only a few mg/Kg and up to 72,000 mg/Kg. The former POL tank farm (site SS007) and the former POL pipeline (site SS008) were also inspected during this site visit. Prospective installation locations for groundwater monitoring wells at SS007 were inspected and discussed. |
Curtis Dunkin |
| 2/2/2011 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 71075 name: Landfill - debris, PAHs |
Bianca Reece |
| 2/5/2013 |
Document, Report, or Work plan Review - other |
Contaminated sites staff reviewed the draft 2012 Record of Decision for LF006 Old Disposal and Electronic Debria Areas and submitted comments to the Air Force. The Air Force is proposing removal and off site disposal for all debris and contamination associated with the former RRS site including petroleum-contaminated soils. Monitoring of natural attenuation is proposed for petroleum-contaminated groundwater at several lower camp sites. |
Curtis Dunkin |
| 3/12/2013 |
Document, Report, or Work plan Review - other |
Contaminated sites staff reviewed the final responses to comments and the revised final 2013 Record of Decision for LF006 Old Disposal and Electronic Debria Areas and submitted approval to to the Air Force to finalize the document. |
Curtis Dunkin |
| 5/7/2014 |
CERCLA ROD Approved |
Contaminated sites staff received and reviewed the final March 2013 Record of Decision for LF006 Old Disposal and Electronic Debria Areas. ADEC determined that the final document adequately addressed ADEC's concerns and revision requests and was signed by John Halverson; ADEC-contaminated sites program manager. The final ROD outlines the Air Force's selected/preferred remedies.
Removal and Offsite Disposal is the selected alternative for both areas at Site LF006. The
boundaries of contamination characterized for Site LF006 during the 2008 Remedial Investigation will be used to guide excavation activities initially, and will be followed by confirmation sampling at rates detailed under ADEC Field Sampling Guidance (ADEC 2010).
Unknowns could be encountered during removal of this landfill, which will require characterization and confirmation sampling during removal activities. Removed soils and buried solid waste will be containerized at the time of excavation. The containers will be shipped offsite to an appropriate treatment, storage, and disposal facility.
Monitoring of natural attenuation is proposed for petroleum-contaminated groundwater at several lower camp sites.
See site file for additional information. |
Curtis Dunkin |
| 1/27/2015 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 71075 Landfill - debris, PAHs . |
Debra Caillouet |
| 7/24/2015 |
CERCLA Remedial Design/Remedial Action Plan Approved |
Final Remedial Action (RA) Work Plan for Remedy Implementation at the Former Driftwood Bay Radio Relay Station, Alaska July 2015 received.
Per the Final ROD for LF006 (USAF, 2013b), there are two distinct areas of contamination at LF006: the Old Disposal Area and the Electronic Debris Area.
The LF006 Old Disposal Area has 30 CY of PAH- and POL-contaminated soil to be removed, along with 1,850 CY of solid waste (Figure 4-4). The soil removal will be guided using a PID, with field screening samples heated to help volatilize the semi-volatile components for detection during screening. The LF006 Electronic Debris Area has 230 CY of lead-contaminated soil to be removed from three subareas, as shown on Figure 4-5. The soil removal will be guided using a NitonXRF analyzer.
There will be no segregation of solid waste from soil and it will all be placed into supersacks, unless the solid waste is too large or too sharp to be accommodated by the supersacks. In which case, the solid waste will be placed into a roll-off gondola bin or connex for disposal. Solid waste will be characterized as inert debris but be disposed of with the PAH-POL-contaminated soil.
Once excavation has thought to have been completed, confirmation samples will be collected and sent to the off-site laboratory for analysis. The excavations will remain open until it is confirmed that the samples are below the SCL. |
Debra Caillouet |
| 3/11/2016 |
Update or Other Action |
Follow-on Remedial Action Work Plan Draft Final received for review & comment.
LF006 – Electronic Debris Area & Old Disposal Area
EDA North- Site LF006 EDA consists of three separate sites, referred to as EDA-North, -South, & - East. The 2015 RA resulted in the excavation, containerization, & disposal of 1,284 tons of contaminated soils. East & South met the site cleanup levels following the 2015 field season: however Subsite EDA-North contains soil which remain in exceedance of SCLs at 230 mg/kg for DRO & 8,300 mg/kg for RRO. The original COC was lead; however, several drums were exposed during the excavation with unknown contents. The drums were removed & underlying soils were sampled for: RCRA-listed metals, nickel, vanadium, VOCs, SVOCs, PCBs, GRO, DRO, & RRO. The only contaminants which exceeded site SCLs were DRO & RRO. The extent of remaining contamination at the site has been well-defined by analytical laboratory confirmation samples.
The 2016 RA will include excavation & disposal of an estimated additional 1,430 tons of POL- contaminated soil which remain in exceedance of the ADEC Method Two Cleanup Levels. POL became a COC following the discovery of drums at the EDA-North Area. Confirmation samples for the extent of the 2015 RA were below SCLs, with the exception of DRO & RRO. DRO & RRO contamination remains at one (general) location of the site, ranging in depth from 1.0 to 6.0’ below ground surface (bgs). In 2016, confirmation samples will be collected from the extents of excavation & compared to SCLs for the site, which consist of the most conservative under ADEC Method Two for the 40-Inch Zone of Title 18 AAC 75.
LF006 Old Disposal Area- Site LF006 Old Disposal Area is located approximately 1 mile south of the Driftwood Bay RRS runway. The 2015 RA resulted in the excavation, containerization, & disposal of 1,484 tons of contaminated soil. Drums with unknown contents were encountered during the 2015 RA. The drums were removed & underlying soils were sampled for: RCRA-listed metals, nickel, vanadium, VOCs, SVOCs, PCBs, GRO, DRO, & RRO. DRO, benzo[a]pyrene, & benzo[a]anthracene were the only analytes detected above SCLs in Waste Characterization Sample 15NIK124SL8.0LF006 collected from the drum area. Additionally, DRO was detected above the SCL at the western sidewall of the excavation.
The 2016 RA will include excavation & disposal of an estimated 2,360 tons of soil & comingled scrap metal. POL remains the primary contaminant of concern (following the results of 2015 RA waste characterization samples), but due to the presence of 55-gallon drums with unknown contents, confirmation samples will be collected for the RCRA list of 8 metals, nickel, vanadium, VOCs, SVOCs, GRO, DRO, & RRO. The depth to un-impacted soil varies from 3.0 to 10.0 feet bgs. Confirmation samples will be collected from the extents of excavation & compared to SCLs for the site, which consist of the most conservative under ADEC Method Two for the 40-Inch Zone of 18 AAC 75
See site file for additional information. |
Louis Howard |
| 3/22/2016 |
Document, Report, or Work plan Review - other |
Staff provided comments on the Follow-on WP for remedy implementation. Main comments were regarding adding PCBs analysis for drums with unknown contents in addition to DRO, RRO, GRO, SVOCs, VOCs and metals, provide groundwater from the six well points that were installed and sampled in 2015, provide documentation relating to institutional controls that were conducted and completed in 2015.
See site file for additional information. |
Louis Howard |
| 4/4/2016 |
Update or Other Action |
Interim 2016 Remedial Action Report received. The RA at LF006 EDA in 2015 resulted in the excavation, containerization, and disposal of 1,284.24 tons of contaminated soils. Results are as follows:
Electronic Debris Area
• Confirmation samples from the excavation sidewalls of EDA-East indicated lead was below SCLs. However, additional confirmation sampling of the excavation floor will be required to achieve site closure. Confirmation samples from the excavation floor will be collected in conjunction with the floor sampling of the ODA, which shares the EDA-East excavation boundary and contaminants of concern.
• Confirmation samples from the extents of EDA-North indicated that lead concentrations were below SCLs; however, DRO and RRO remained at concentrations exceeding site SCLs. Continued RA will be required to address remaining soil contamination. An estimated 1,400 tons of contaminated soil remain at EDA-North.
• Confirmation samples from the extents of EDA-South have met SCLs for the site; therefore, EDA-South requires no further RA.
Old Disposal Area
The RA at LF006 ODA in 2015 resulted in the excavation, containerization, and disposal of
1,484.27 tons of contaminated soils and 10 tons of scrap metal. Confirmation samples collected
along the southern extent of the excavation have met SCLs for the site. However, soil exceeding
the site SCLs for DRO, RRO, and PAHs, as well as solid waste, remain at the site. Continued
RA at ODA will be required to address the remaining contaminated soil and solid waste. An
estimated 2,400 tons of contaminated soil and solid waste remain at ODA. |
Louis Howard |
| 4/19/2016 |
Document, Report, or Work plan Review - other |
On behalf of the Alaska Department of Environmental Conservation (ADEC), I have reviewed the draft-final Interim 2016 Remedial Action Report for DA013, LF006, OT001, and WP003 at Driftwood Bay RRS. ADEC has reviewed and commented on the work plan for follow-on work in 2016 which is based upon this reort. ADEC requests the field work interim reports precede the subsequent work plans in the future by at least forty five days. Please finalize this document. |
Louis Howard |
| 4/3/2017 |
Document, Report, or Work plan Review - other |
Comments on the Draft Final 2015-2016 Remedial Action Report provided by staff.
Main comments: ADEC does not concur with a “cleanup complete” determination for LF006 (EDA and ODA). Groundwater was encountered in several locations along the excavation floor at ODA. Soil samples collected from the excavation floor at the groundwater interface in two locations exceeded SCLs for diesel range organics (DRO) and residual range organics (RRO). Excavation activities did not proceed into groundwater; therefore exceedances remain at the groundwater interface.
ADEC concurs that the EDA portion of LF006 meets the “cleanup complete” closure criteria, however LF006 is composed of both the EDA and the ODA source areas and will not be assigned a “cleanup complete” until the ODA source area meets applicable cleanup levels.
See site file for additional information. |
Louis Howard |
| 1/18/2018 |
Update or Other Action |
Institutional Controls Implementation Plan (IC Plan) for site LF006 at Driftwood Bay Radio Relay Station (RRS) received for review and comment.
ICs at LF006 consist of the following: 1. Land Use Controls site are incorporated into the 611th Civil Engineering Squadron Land Use Control Management (LUCM) Plan. 2. A Notice of Environmental Contamination will be placed in the Alaska Department of Natural Resources’ (ADNR’s) land records. 3. Warning signs placed at the boundary of the site will provide contact information for LUCM.
Soil remains at concentrations exceeding the RAOs for DRO and RRO. All the samples exceeding the RAO are at depths of five feet or greater. According to 18 AAC 75.340, human exposure from ingestion of or dermal contact with soil, or inhalation of particulates or a volatile hazardous substance, must be attained in the surface soil and the subsurface soil to a depth of 15 feet, unless an institutional control or site conditions prevent human exposure to the subsurface soil.
The second RAO was met as all buried solid waste by removal from environmentally sensitive
areas was removed. Therefore, no exposure or release of contamination can occur.
Implementation of Institutional Controls (ICs) at site LF006 will meet the RAO as the ICs will
prevent the ingestion, inhalation, and offsite migration of soil containing RRO and DRO.
Based on the analytical data collected at Site LF006, the Air Force concluded that the site LF006 meets “Cleanup Complete with Institutional Controls” criteria.
See site file for additional information. |
Louis Howard |
| 1/23/2018 |
Document, Report, or Work plan Review - other |
Draft ICs Plan received for review and comment. Main comments were to add a schedule of when it would be expected that the notice of environmental contamination be filed with Alaska Dept. of Natural Resources land records and warning signs would be placed at the site. Other comments were to add more text and verbiage to the institutional control plans to be more consistent with other final records of decision signed with the Air Force for sites with institutional/land use controls.
See site file for additional information. |
Louis Howard |
| 4/17/2018 |
Cleanup Complete Determination Issued |
Based on the information provided to date, it has been determined by ADEC that the contaminant concentrations remaining at the Old Disposal Area do not pose an unacceptable risk to human health or the environment. No further remedial action will be required by ADEC at the Old Disposal Area as long as the institutional controls are established in a timely manner, maintained, effective and no new information becomes available that indicates residual contamination poses an unacceptable risk to human health or the environment. |
Louis Howard |
| 4/17/2018 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. Petroleum contamination remains in the sub-surface soils above levels suitable for unrestricted future use; however, residual contaminant concentrations are below maximum allowable soil cleanup levels, groundwater beneath the site is not impacted and land use controls will be established by the USAF to limit potential future exposure.
See site file for additional information. |
Louis Howard |
| 4/25/2018 |
Potentially Responsible Party/State Interest Letter |
PFAS has not been evaluated in the wells downgradient from the LF006 landfill. The Department of Defense has included sampling for PFAS in groundwater downgradient from landfills at a number of installations in the Pacific Northwest. |
Louis Howard |
| 9/25/2018 |
Update or Other Action |
Location data adjusted, based on USAF database (via BLM web map), and consistent with site diagram in LF006 ROD. |
Eric Breitenberger |
| 4/9/2020 |
Document, Report, or Work plan Review - other |
Staff reviewed and approved the 2019 LUC/ICs & LTM report for SS002, SS007, SS010, LF006, and WP003. |
Louis Howard |
| 3/18/2021 |
Update or Other Action |
Staff reviewed and provided comments for the Draft 2020 RAO, IC/LUC report for SS002, SS007, SS010, LF006, and WP003, dated March 2021. |
Cascade Galasso-Irish |
| 5/17/2021 |
Document, Report, or Work plan Review - other |
DEC Reviewed the Draft 2020 Remedial Action Operations, Institutional Control/Land Use Control Report for Driftwood Bay Radio Relay Station and five sites: LF006, SS002, SS007, SS010, and WP003, dated March 2021, received on March 23 2021. Field activities included a site visit on September 13, 2020 to ensure ICs are enforced and site conditions continue to be protective of human health and the environment. RTC sent 4/20/2021, and report Final approved on this date. |
Cascade Galasso-Irish |
| 8/3/2021 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the Draft Final UFP-QAPP for Long Term Management Activities, Driftwood Bay Radio Relay Station, Alaska, dated March 2021. Comments send by ADEC on June 14th, and RTC and redline received on August 9th. The work plan describes the USAFs intent to collect groundwater samples from six wells at SS007 to determine whether trends indicate continued natural attenuation is occurring; conduct a review of institutional controls (ICs) at all sites (LF006, SS002, SS007, SS010, and WP003), and conduct a landfill cap inspection to ensure land use controls (LUCs) currently in place are effectively reducing potential exposure. SS010, SS002, and SS007 have NECs recorded at the sites documenting that cleanup have been performed to the maximum extent practicable even though residual fuel contaminated soil and/or solvent contaminated groundwater exists on site, however the 2021 sampling of SS007 is intended to demonstrate the site has reached UU/UE and can be closed without ICs. The report and RTC was approved on this date. |
Cascade Galasso-Irish |
| 8/4/2021 |
Institutional Control Update |
The remedy for LF006 (excavation) was documented in the Record of Decision (ROD) (USAF, 2013) and the ADEC decision document (ADEC, 2018). ICs are required because residual impacts remained above ADEC criteria after the remedial action was completed. The Old Disposal Area has no monitoring components and is only subject to annual landfill cap inspections and LTM inspections to document on-site LUCs/ICs (warning signs) remain in place and are effective to prevent exposure to residual DRO and RRO in soil. |
Cascade Galasso-Irish |
| 6/24/2022 |
Document, Report, or Work plan Review - other |
ADEC received and approved the LTM work plan for Driftwood Bay multiple sites, and the Addendum to the final work plan for additional sampling of LF006. Additional samples will be taken at the old disposal area at the former DRO/RRO exceedance and the benzo(a)pyrene exceedance at LF006. |
Cascade Galasso-Irish |
| 12/19/2022 |
Institutional Control Record Removed |
ADEC received the 2022 sampling results for the LF006 site. The three hot spot areas at the Old Disposal Area were resampled and determined to be below ADEC most stringent cleanup levels. ADEC approves the report, and site is approved for Cleanup Complete without Institutional Controls. The ICs will be removed from the site file, and the status will be changed to Cleanup Complete. |
Cascade Galasso-Irish |
| 12/19/2022 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 81269 name: Electronic Debris Area |
Cascade Galasso-Irish |
| 9/18/2023 |
CERCLA PA |
On this date, DEC reviewed the Draft Preliminary Assessment Report for Aqueous Film-Forming Foam (AFFF) areas, Driftwood Bay Radio Relay Station, Alaska. No AFFF sources (fire training or non-fire training) areas were identified at the RRS. |
Cascade Galasso-Irish |
| 1/18/2024 |
Document, Report, or Work plan Review - other |
On this date, DEC received and approved the Final 2022 Land Use/Institutional Controls and Long-Term Management Report for the Former Driftwood Bay RRS Sites LF006, SS002, SS007, SS010, and WP003. |
Cascade Galasso-Irish |
