| Action Date |
Action |
Description |
DEC Staff |
| 4/27/2006 |
Site Number Identifier Changed |
Workplan Type (portion of RECKEY) changed from Oil (01) to Hazardous Substance (09). Entered incorrectly when site was initially added to database. |
Mitzi Read |
| 4/27/2006 |
Site Added to Database |
Site added to the database. |
Mitzi Read |
| 2/20/2007 |
Update or Other Action |
Received Draft Unalakleet Release Investigation Work Plan for work to be done during summer 2007. |
Lisa Maserjian |
| 3/5/2007 |
Exposure Tracking Model Ranking |
Initial ranking. |
Lisa Maserjian |
| 3/22/2007 |
Update or Other Action |
Send letter to FAA with comments to the Draft Unalakleet Work Plan. No major issues with this work plan. |
Lisa Maserjian |
| 4/25/2007 |
Meeting or Teleconference Held |
Met with Bristol Environmental and FAA, Marc Pikwo to discuss using Mulitincrement Sampling during the sampling work this summer. Earl Crapps was also present. Determined that the Decision Units sizes already proposed for discrete sampling were approved by Earl. Some of the sites are located in tundra areas and most likely the lab will not be able to process these. Bristol is planning to use a lab that will do the sieving. Bristol will send Earl the SOQ s from this lab. |
Lisa Maserjian |
| 3/21/2008 |
Update or Other Action |
Received the Draft 2007 RI Report. The report indicates that PCBs were detected slightly above the clean up level in one sample taken from the CT. The report recommends further delineation of this area. |
Kim DeRuyter |
| 12/2/2014 |
Update or Other Action |
Assigned site to new PM for FAA Unalakleet. |
Fred Vreeman |
| 8/11/2015 |
Site Characterization Workplan Approved |
DEC approved the Final Work Plan, Decommissioning Infrastructure and Investigating/Remediating Contaminated Soil FAA Unalakleet Station, Alaska. The purpose and objectives of the planned work are to: 1) remove unused and associated debris from the Range Site and CT site and remove towers and ceilometers from the Unalakleet Airport, 2) investigate the nature and extent of contamination at the Range, CT, and VORTAC Drum Storage area sites, 3) excavate soil that exceeds DEC Method 2 cleanup levels from the CT and Range Sites; and 4) test transformer oils and sample soil for presence of PCBs at the VASI and LOC locations. Bethel plans to execute field work for this project in two phases. The first phase will be executed during the summer/fall 2015 field season and will include all field work associated with removing two ceilometers and DF towers/infrastructure from the Unalakleet airport, consolidating debris and infrastructure into piles at the Range and CT sites for winter transport off site, delineating contaminated soil at the Range and CT sites for winter excavation and transport off site, conducting a permafrost study, sampling transformer oil and soil for PCBs at the VASI and Localizer sites, and investigating the extent of contaminated soil at the VORTAC Drum Storage Area. |
Monte Garroutte |
| 3/21/2016 |
Site Characterization Workplan Approved |
DEC approved the Work Plan Addendum, Decommissioning Infrastructure and Investigating/Remediating Contaminated Soil, FAA Unalakleet Station, Alaska. This work plan addendum reports findings of Phase 1 work that affect the execution of the second and third phases of work (Phase 2 and Phase 3) and describes the associated work. Phase 2 is scheduled to begin in late March 2016 and Phase 3 in June 2016. The purpose of the proposed work is to decommission and remove FAA infrastructure in the vicinity of Unalakleet that is no longer in use and to investigate/remediate contamination resulting from operations at the sites. Work was fully completed at the Direction Finder (DF), two ceilometers at the airport, and the Very High Frequency Omnidirectional Range Collocated Tactical Air Navigation (VORTAC) Drum Storage Area during Phase 1. Work remains to be conducted at four sites, including the Range Site (also referred to as the SBRAZ Site), Communication Transmitter (CT) Site, Visual Approach Slope Indicator (VASI), and Localizer (LOC). Phase 2 work includes 1) the removal of unused and associated debris from the Range Site and CT Site; 2) The excavation of petroleum-contaminated soil that exceeds DEC Method 2 Human Health cleanup levels from the Range Site; and 3) testing transformer oils for PCBs at the VASI and LOC locations. Phase 3 includes 1) Field screening and sampling for lead at the site of two fallen towers at the CT Site; 2) Sampling soil for presence of PCBs at the VASI and LOC locations if the transformer oil is positive for PCBs in Phase 2; 3) Excavation of PCB-contaminated soil at the CT site; 4) Monitoring of the tundra disturbance and surface water quality at the Range Site following the Phase 2 excavation and backfill. |
Monte Garroutte |
| 11/6/2017 |
Update or Other Action |
Approved Decommissioning, Remediation, and Site Investigation Report 2017 addressing five areas of concern including the Range Site, Communication Transmitter (CT) Site, Very High Frequency Omnidirectional Range Collocated Tactical Air Navigation (VORTAC) Drum Storage Area, Visual Approach Slope Indicator (VASI), and Localizer. Site investigations led to remediation efforts at the Range Site and CT Site with 30 cubic yards and one cubic yard of soil removed, respectively. Petroleum contamination remains at the Range Site with concentrations of DRO ranging 263–151,000 mg/kg and RRO ranging 2,240–12,900 mg/kg, both results with silica gel cleanup. Lead contamination remains at the CT Site with the highest concentration at 56,900 mg/kg, in addition to minimal PCB contamination above cleanup levels (1.2 mg/kg). Contamination at the remaining AOCs is below cleanup levels. DEC concurs that additional work will be required at the Range Site and lead remaining at the CT will have to be addressed through remediation or ICs. |
Gretchen Caudill |
| 8/27/2018 |
Document, Report, or Work plan Review - other |
WP reviewed and comments provided for Range (SBRAZ) and CT sites. Objectives listed include: the delineation of and removal of remaining fuel contamination at the Radio Range Site, mitigation of the lead-based paint chips at the CT site, and characterization of area beneath the former towers that were painted with lead based paint. |
Gretchen Caudill |
| 2/21/2019 |
Document, Report, or Work plan Review - other |
DEC Approval of 2018 RA and RI for 2 sites - CT Towers and Radio Range Site. |
Gretchen Caudill |
| 7/2/2019 |
Update or Other Action |
Site location was updated on this date. Coordinates for this site are used to determine the presence and position of the site on BLM’s ANCSA Conveyed Land web map. |
Rebekah Reams |
| 5/4/2021 |
Document, Report, or Work plan Review - other |
Completed review of Remedial Investigation and Remedial Action at Two Sites at the FAA Unalakleet station. Report detailed third phase of project, covering investigation and removal of contaminated soils at the Radio Range (SBRAZ) site and the Communication Towers (CT) site. Contaminated soils were removed fromteh SBRAZ and CT sites in addition to approx. 150 pounds of lead-based paint chips. Confirmation sample results from excavation margins are below Method Two Cleanup Levels. Report is approved. |
Kelly Walker |
| 10/7/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75199 CT Site. |
Kelly Walker |
| 10/7/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75199 CT Site. |
Kelly Walker |
| 10/26/2021 |
Cleanup Complete Determination Issued |
Site has been evaluated and issued a closure complete determination on October 25, 2021. The remaining contaminants include PCBs and Lead. The maximum remaining concentration of PCBs is 0.226 mg/kg. Source area is the former transformer near the former CT transformer building. The maximum remaining concentration of lead is 154 mg/kg. Lead based paint chips had flaked off two 60 foot communication towers. Paint chips were removed from the tundra using HEPA vacuums. Approximately 10 gallons of lead based paint (LBP) chips were collected during this effort. After the removal action occurred, incremental sampling methodology samples were collected from the area beneath the former towers. The resulting decision unit encompassed the affected area. An ecoscoping evaluation was conducted to evaluate the remaining contamination and potential exposure to ecological receptors. The proximity to the airport and the depth of the remaining LBP show that ecological receptors are unlikely to come into contact with the remaining contamination.
Migration to groundwater cleanup levels do not apply at this location as no groundwater or surface water was encountered during site characterization activities. Closure letter is attached to this file. |
Kelly Walker |
