| Action Date |
Action |
Description |
DEC Staff |
| 1/25/2017 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 7/25/2017 |
Meeting or Teleconference Held |
DEC Staff met with ASIG and consultant AECOM to discuss status of site and path forward. A letter dated September 22, 2017 documents the meeting and subsequent communications. BMPs for stormwater will be added to the operations plan for this site. |
Wendy Hansen |
| 9/27/2017 |
Site Visit |
DEC Staff visited the site. Soil from projects B Gates and UPS Hardstand have been received to date, spread at the front (south) end of the landspread area, and separated by colored stakes. 2016 UPS soil is spread on the west side (blue stakes), B Gates in the middle (green stakes), and 2017 UPS soil to the east (orange stakes). |
Wendy Hansen |
| 8/24/2018 |
Document, Report, or Work plan Review - other |
DEC staff reviewed report titled "UPS Hardstand Replacement Environmental Oversight Report Anchorage International Airport Anchorage, Alaska" prepared for United Parcel Service and dated March 2018. Six hardstands were replaced in 2016 and 2017. The concrete hardstands and adjacent asphalt were removed to accommodate new hardstand placement. Shallow field screening was used to segregate soils for disposition. Following characterization, clean soils were reused on airport projects and warm soils were spread at the new AFSC landspread area. Approximately 2,350 cubic yards of soil were taken to the landspread area. |
Wendy Hansen |
| 6/13/2019 |
Document, Report, or Work plan Review - other |
DEC staff reviewed a 2019 Soil Monitoring Work Plan, and provided comments. The scope of work included ISM sampling of 5 decision units where contaminated soils from projects were placed between 2016 and 2018 to determine contaminant concentrations. Samples will be analyzed for GRO, DRO, RRO, VOCs, and PAH. |
Wendy Hansen |
| 6/27/2019 |
Document, Report, or Work plan Review - other |
Staff approved the 2019 Soil Monitoring Work Plan. All comments were satisfactorily addressed. |
Wendy Hansen |
| 8/29/2019 |
Offsite Soil or Groundwater Disposal Approved |
Staff approved disposal of one bucket of soil from UPS Hardstand site (2100.38.028.36) at the airport to the AFSC Landspreading Area. Analytical results were well below 18 AAC 75.341 Tables B1 and B2 cleanup levels for the under 40 inch zone. |
Wendy Hansen |
| 12/19/2019 |
Document, Report, or Work plan Review - other |
Staff reviewed 2019 landspread soil monitoring report, and provided comments. Incremental samples were collected from each of five landspread cells and analyzed for GRO, DRO, RRO, VOCs, and PAH. One sample was collected in triplicate. Results for all five cells were below the most stringent cleanup levels. The cells contained soil from projects UPS Hardstand 2016 and 2017 and B Gates 2017 and 2018. |
Wendy Hansen |
| 2/25/2020 |
Document, Report, or Work plan Review - other |
Staff approved 2019 Monitoring Report. The report documented the sampling and analysis of soils spread in the landspreading area to date in five cells. This included contaminated soil from B Gates and UPS Hardstand. Results indicated concentrations of contaminants were below cleanup levels. No samples were collected from soils allocated to a mushroom remediation study. Approval was giving to place an additional layer of soil over the cells sampled. In addition, staff requested PFAS sampling be conducted representative of the area where soils have been spread to determine whether PFAS is a concern at the landspreading area. Testing soils for PFAS prior to placement in the landspread area is and added requirement for future projects. |
Wendy Hansen |
| 5/26/2020 |
Document, Report, or Work plan Review - other |
Staff reviewed and approved of ADOT's work plan to determine whether per- and polyfluoroalkyl substances (PFAS) related compounds are present in soil within the AFSC Landspread Area. There are currently 4 construction projects that have deposited and spread soil within the Landspread Area. |
Todd Blessing |
| 7/8/2020 |
Update or Other Action |
ADOT&PF submitted a report to ADEC that details the sampling and analysis of soil for PFAS at the AFSC landspread area. PFOS was detected above migration to groundwater cleanup levels in two areas within the landfarm. ADEC met with ADOT&PF to discuss the management of the PFOS contaminated soils to protect human health and the environment. ADOT&PF is going to discuss management of the PFOS contaminated soils with AFSC since AFSC requested the soil be removed. |
Todd Blessing |
| 9/15/2020 |
Update or Other Action |
Tellus Ltd. informed DEC staff that 1,000 cubic yards of impacted soil from HS#5 stockpile containment cell was transported to the AFSC AIA Landspreading Area. |
Todd Blessing |
| 10/27/2020 |
Offsite Soil or Groundwater Disposal Approved |
Staff approved of Tellus Ltd's request to transport 2,000 cubic yards to AFSC's landspread area that was generated during the AIA Ramp Area Project at 6050 Rockwell Avenue. |
Todd Blessing |
| 6/24/2021 |
Document, Report, or Work plan Review - other |
The DEC approved the Green East ISM Sampling Work Plan, which describes sampling of a particular area within the landspread area where PFAS have been detected in soils. Sampling with incremental sampling methodology (ISM) will provide a more representative sample with the goal of assisting in determination of potential storage or disposal options. |
Robert Burgess |
| 9/8/2021 |
Document, Report, or Work plan Review - other |
The DEC reviewed the Green East ISM Sampling report, which documents incremental sampling results showing that the 95% upper confidence level (UCL) for ISM samples exceeds migration to groundwater cleanup levels for PFOS. DEC also reviewed a work plan for removal of PFAS contaminated soils and creation of a long-term storage stockpile, and subsequent ISM sampling of the undisturbed ground beneath the PFAS contaminated soils. The DEC approved the work plan on the condition that the stockpile is inspected and maintained on a quarterly basis or more frequently and that Menzies agrees to revisit soil storage or disposal in two years time or earlier. |
Robert Burgess |
| 9/21/2021 |
Document, Report, or Work plan Review - other |
The DEC reviewed the draft Report for 2021 Soil Monitoring and a request to allow placement of additional soil based on ISM results documenting a 95% upper confidence limit that is less than DEC cleanup levels. The report and request to place additional soils were approved. |
Robert Burgess |
| 2/28/2023 |
Meeting or Teleconference Held |
DEC met with AFSC and their consultant to discuss management of the PFAS soil stockpile beyond the September 1, 2023 two year deadline. AFSC will be meeting with the Anchorage International Airport to discuss long-term management, treatment or disposal of the stockpile, however if the stockpile cannot be removed by the deadline, the DEC provided approved for extending the deadline but requests continued periodic inspections and maintenance of the stockpile be reported to the DEC. |
Shawn Tisdell |
| 9/5/2023 |
Site Characterization Workplan Approved |
DEC reviewed July 24, 2023 AFSC Landspread North ISM Soil Sampling workplan. The workplan outlined an incremental sampling methodology (ISM) for sampling each of the five cells located within the fence of the landspread area. Fieldwork will take place August/September and consist of ICM sampling of each cell as individual decision units. Field screened samples will be collected from two cells, F and G, will be collected during the first sampling event. A sample will also be collected from surface water down gradient of the site to determine if best management practices are being effective. |
Shawn Tisdell |
| 4/25/2024 |
Site Characterization Report Approved |
AFSC 2023 Incremental Sampling Methodology (ISM) Soil Sampling of Cells C, D, E, F, and G; Surface Water Sampling; and Berm Inspections report received and approved. ISM samples (30 aliquots from random locations in each cell) were collected from five cells (Cell C, D, E, F, and G). Each cell was sampled as a single decision unit. Results of petroleum hydrocarbons in all cells were less than the target cleanup levels for petroleum constituents. The soil will remain in place and act as a base for the placement of additional petroleum contaminated soil. Surface water was also sampled at a location downgradient of the soil cells. PAHs and BTEX results indicated that total aqueous hydrocarbons and total aromantic hydrocarbons were below DEC water quality criteria. Additional details are available in the attached report. |
Shawn Tisdell |
| 1/23/2025 |
Document, Report, or Work plan Review - other |
The AFSC TSAIA Landspread North 2024 Annual Report was received. This report provides site inspection notes and photos documenting conditions of the landspreading area. In particular, Menzies staff conducted regular site visits inspecting the fence and berms surrounding the area. In August a pond was observed on the west side of the site that proved attractive to ducks. The pond was filled as it was against ANC policy since aircraft fly above the area of the site. A PFAS stockpile remains outside the landspread area fence. The stockpile liner and cover is inspected. The DEC has provided time extensions until the full removal and disposal or treatment of the pile can be managed. |
Shawn Tisdell |
| 8/8/2025 |
Update or Other Action |
DEC provided approval to extend stockpile storage of PFAS impacted soil originating from the B-gate construction project until September 30, 2027. |
Shawn Tisdell |
