Gwinn KI Sawyer Air Force Base

Gwinn KI Sawyer Air Force Base is a site which reflects known PFAS levels. Based on environmental and health concerns, further review and possible action may be necessary to best protect public health. More details about this location will be made available as soon as possible.

  • The former K.I. Sawyer Air Force Base site first came to the MDEQ’s attention in April 2014 when the Air Force’s contractor met with the MDEQ to conduct a record search to begin the Air Force’s investigation.
  • The Phase I investigation occurred in 2014-2015 and included two fire training areas.
  • The Phase II investigation occurred in 2016-2017 and included other suspected sources of PFAS use, including three plane crash sites, fire suppression systems in a few buildings, storm water infiltration basins, two streams, three lakes, the Wastewater Treatment Plant (WWTP), two landfills, and undeveloped areas where WWTP sludges were land-applied.
  • From 2015 to 2016, hundreds of soil samples were taken, along with samples from the four on-base municipal water supply wells, groundwater, surface water, and at the WWTP.
  • In 2017 sampling of surface water, sediment, the WWTP, and residential wells was conducted. One of two residential wells had PFAS above the LHA. The results of the residential well sampling are in the table below.
  • Bottled water was provided immediately by the United States Air Force (USAF) upon receipt of the first residential well samples, and follow-up samples collected from both residential wells had essentially identical results.
  • A whole-house treatment system was installed by the USAF in June 2018, which is being operated by the USAF for the resident. Initial samples of the treated water were non-detect for all PFAS compounds, and the first routine quarterly samples of the system will be collected in early September 2018.
  • Planning is well underway for additional monitor wells by USAF to investigate the extent of PFAS migration off-base.

# Residential Well Samples

# Residential Well Results Received

# Non-Detect (PFOS + PFOA)

#ND – 70 ppt (PFOS + PFOA)

#> 70 ppt (PFOS + PFOA)

Highest Residential Well value in ppt

2

2

1

0

1

365