| Action Date |
Action |
Description |
DEC Staff |
| 11/21/2019 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 6/12/2020 |
Document, Report, or Work plan Review - other |
ADEC received a Statewide work plan for characterization and cleanup of PFAS at Title 14, code of federal regulations, Part 139 certificated airports and/or former known DOD sites. The work plan provides a ruberic for sampling soil, water, and sediment at all sites. ADEC has reviewed the work plan and provided comments. |
Erin Gleason |
| 7/15/2020 |
Document, Report, or Work plan Review - other |
ADEC has reviewed the statewide PFAS general work plan and requests revisions. Comments sent to ADOT on this date. ADEC requests revised work plan. |
Erin Gleason |
| 7/15/2020 |
Document, Report, or Work plan Review - other |
Received sampling and analysis plan on 6/17/2020 for soil sampling along side the geotechnical survey that is occurring in August 2020. The geotechnical survey is in preparation for the summer 2021 Main Runway construction project. The intent of the work plan is to determine if there is PFAS in any of the soil cutting and to determine if any of the areas of the 2021 construction project have PFAS contamination. ADEC has reviewed the work plan and requests revisions. |
Erin Gleason |
| 7/29/2020 |
Site Characterization Workplan Approved |
Received response to comment for the Main runway geotechnical survey work plan on 7/23/2020. ADEC concurs with all comment responses and requested via email that ADOT submit a final draft work plan. Received final draft work plan from ADOT on 7/29/2020. ADEC sent letter on this date approving final work plan. The work plan is for the main runway geotechnical work. |
Erin Gleason |
| 8/10/2020 |
Site Characterization Workplan Approved |
ADEC receives revised statewide general PFAS work plan from ADOT on 8/3/2020. ADEC has reviewed the work plan and it is now approved. |
Erin Gleason |
| 1/13/2021 |
Site Characterization Report Approved |
ADEC received the PFAS investigation chemical data report on 12/8/2020. PFOA and PFOS were widely detected across the areas sampled at concentrations below the ADEC cleanup levels. PFOS exceeded the 3.0 µg/kg cleanup level in two test borings along Runway 1L/19R between Taxiways D and the intersection with Runway 12/30 at 13 and 25 µg/kg. PFOA exceeded the 1.7 µg/kg cleanup level in one test boring on Taxiway D. Notably, sample locations for this investigation were not selected based on environmental criteria, but in support of geotechnical investigation of the airport. As horizontal sampling locations were not selected based on environmental criteria, it is likely that other areas of elevated PFOS and PFOA may be found at the Bethel Airport. ADEC has received the report and it is now approved. ADEC requests a meeting with ADOT to discuss reconstruction plans at the Bethel airport and how that may or may not inolve PFAS contaminated areas. |
Erin Gleason |
| 2/10/2021 |
Meeting or Teleconference Held |
ADEC and ADOT met to discussion PFAS contamination at the Bethel airport and how that could potentially be impacted by the 2021 reconstruction. Current plans do not include excavation to depths where the PFAS is located. No work plan or soil management plan is need for the runway project. |
Erin Gleason |
| 3/10/2021 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 80514 name: Bethel Airport Sitewide PFAS |
Erin Gleason |
| 6/1/2021 |
Update or Other Action |
J. Fix assigned new project manager. |
Julie Fix |
| 7/14/2021 |
Document, Report, or Work plan Review - other |
On July 14, 2021 ADEC received "FINAL Preliminary Assessment Report Bethel Army Aviation Operating
Facility and Armory Alaska Perfluorooctanesulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) Impacted Sites ARNG Installations, Nationwide" dated August 2020. The assessment summarizes the preliminary assessment for for per- and polyfluoroalkyl substances (PFAS)-containing materials was completed for Bethel Army Aviation Operating Facility (AAOF) and Armory (also referred to as the “facility”) in Bethel, Alaska to assess potential PFAS release areas and exposure pathways to receptors. |
Rachael Petraeus |
| 7/14/2021 |
Document, Report, or Work plan Review - other |
On July 14, 2021 ADEC received "Draft-Final Site Inspection Uniform Federal Policy Quality Assurance Project Plan (UFP-QAPP) Addendum Bethel Army Aviation Operating Facility and Armory Bethel, Alaska Per- and Polyfluoroalkyl Substances Impacted Sites ARNG Installations, Nationwide" dated June 2021. The work plan proposes to collect soil and groundwater samples to determine the presence or absence of PFOA, PFOS, and PFBS. |
Rachael Petraeus |
| 8/4/2021 |
Update or Other Action |
Received presentation from the Bethel Army Aviation Operating Facility (AAOF) in Bethel Site Inspection on behalf of the Alaska Army National Guard (AKARNG) Technical Project Planning (TPP) Meeting (1&2) for the Preliminary Assessments and Site Inspections (PA/SI) for Perflorooctanesulfonic Acid (PFOS)-and Perfluorooctanoic Acid (PFOA)-Impacted Sites. One area of interest, the "Bethel AAOF Hangar," was identified in the preliminary assessment due to the storage of AFFF in that location. Of specific concern are the floor drain outlet on the SW part of the property and septic that is pumped out by Bethel municipal service. |
Julie Fix |
| 10/12/2021 |
Update or Other Action |
On October 12, 2021 ADEC received the final "Draft-Final Site Inspection Uniform Federal Policy Quality Assurance Project Plan (UFP-QAPP) Addendum Bethel Army Aviation Operating Facility and Armory Bethel, Alaska Per- and Polyfluoroalkyl Substances Impacted Sites ARNG Installations, Nationwide" dated September 2021. The work plan proposes to collect soil and groundwater samples to determine the presence or absence of PFOA, PFOS, and PFBS. |
Rachael Petraeus |
| 6/2/2022 |
Site Visit |
Site visit on airport property. Observed the locations of the AKARNG structures, 2019 Grant Aviation aircraft fire, 2021 Yute Air aircraft fire, and the Skyvan crash site. |
Julie Fix |
| 6/2/2022 |
Site Visit |
DEC staff collected two drinking water samples from 13 public and private drinking water wells on or downgradient from the Bethel Airport property under the EPA Site Discovery Grant. This sampling effort will be documented in the file for this site (2407.38.031). |
Julie Fix |
| 6/9/2022 |
Document, Report, or Work plan Review - other |
The "Bethel Airport West Apron Improvements PFAS Sampling and Analysis Plan - DRAFT" was received via email on this date. ADEC comments were sent to the RP on July 20, 2022. A response to comments and updated work plan was received on July 28, 2022. |
Julie Fix |
| 9/2/2022 |
Site Characterization Workplan Approved |
Approval Letter for the “PFAS Sampling and Analysis Plan”, dated August 29, 2022, sent on this date. The work plan was initially submitted on June 8, 2022. The plan proposes to collect soil samples from several areas during the geotechnical investigation for this project including the Taxiway/Taxilane G-1 area, Taxiway/Taxilane G-2 area, Taxiway/Taxilane G-3 area, West Apron-2 area, and the ARFF/SREB Apron area. Samples will be collected from the existing asphalt, surface underneath the asphalt, and extend to 10 feet below the ground surface (bgs). |
Julie Fix |
| 10/17/2022 |
Offsite Soil or Groundwater Disposal Approved |
Offsite treatment and disposal of six 55-gallon drums of PFAS contaminated soil from the August 2020 field effort along with six 55-gallon drums of presumed PFAS contaminated soil from the Fall 2022 field effort at the US Ecology Moose Creek Facility in North Pole, AK was approved via email on this date. |
Julie Fix |
| 2/13/2023 |
Site Characterization Workplan Approved |
The use of the "Revision 1 - DOT&PF Statewide PFAS General Work Plan" was approved for collecting a drinking water sample from the Alaska Airlines terminal at the Bethel Airport. |
Julie Fix |
| 1/26/2024 |
Site Characterization Report Approved |
Reviewed and approved the report "Final PFAS Investigation Chemical Data Report, Bethel Airport West Apron Improvements, Bethel, AK Dated January 25, 2024." The report soil sampling efforts from geotechnical investigations in several areas at the Bethel Airport to analyze for per- and polyfluoroalkyl substances (PFAS) contaminants of potential concern (COPCs). PFOS and PFOA were detected above MTG in several locations, both in soil and asphalt or pavement medias. The report recommends future management plans be developed to continue safe and proper management of contaminated materials generated through construction or remediation projects and recommends reuse of material from contaminated areas within areas from which it was generated. |
Tim Sharp |
