Grayling Army Airfield (Grayling, Crawford County)

• In May 2017, the MDMVA notified the Michigan Department of Environment, Great Lakes, and Energy (EGLE) that groundwater samples on the Grayling Army Airfield tested positive for PFOA/PFOS.
• In June 2017, EGLE began testing private residential wells due to the groundwater results from on-base at the Grayling Army Airfield. Private well sampling continues currently as requests come in. Filters have been provided to residents with detections of more than 70 ppt PFOS+PFOA, and ongoing discussions are needed to determine if filters should be provided to additional homes until a long-term solution is identified.
• In June 2017, two wells were sampled at the Timberly Village Mobile Home Community. Results showed low levels of PFAS. 
  • Follow-up samples were collected in August 2017 and results of these samples confirmed the initial sample results.
  • Notification to the approximately 60 residents in 25 mobile homes was provided by the owner.
• Between Fall 2017 and Winter 2018, EGLE collected 43 environmental boring samples.
• Beginning July 10, 2018, EGLE started monitoring well installations, with 73 monitoring wells installed at 20 locations. Currently, data is being evaluated and maps developed to assist in determining next steps. A Technical Report is due in March 2019.
• On May 29, 2018, EGLE hosted a meeting to update local officials on the status of the investigation.
• On December 11, 2018, EGLE hosted a Public Meeting for the community.
• On December 20, 2018 AECOM collected six residential drinking water samples. Results were received on January 17, 2019.

• On February 6, 2019 AECOM collected one (1) residential drinking water sample. Results were received on February 21, 2019.
• AECOM completed the 2nd round of Remedial Investigation (RI) groundwater monitoring on February 8, 2019.
• On March 12, 2019 AECOM collected three (3) residential drinking water samples. Results were received on April 3, 2019.
• On June 5, 2019, there was a Restoration Advisory Board (RAB) community meeting for the Grayling Area to learn about the RAB process, how a RAB functions, and the change to fill out a Community Member Interest Form. Applications are due by June 10 and the first RAB meeting will be announced after applications are reviewed.
  • View the Restoration Advisory Board Information Meeting Presentation.
• AECOM collected three (3) residential drinking water samples on June 12, 2019. Results were received on July 11, 2019.
• The Army National Guard hosted an open public meeting from 7:30-8:30 on June 25, 2019 at Kirtland Community College, 4800 W 4 Mile Rd, Grayling, to discuss plans to provide alternative drinking water to property owners with wells over 70 ppt of PFOA and PFOS.
• AECOM collected one (1) residential drinking water sample on July 9, 2019. Results were received on August 1, 2019.
• AECOM submitted the Remedial Investigation Report on July 9. 2019.
• EGLE held a Town Hall PFAS Informational Meeting on August 1, 2019 at Kirtland Community College to present results of recent environmental investigations.
  • View the August 1 Town Hall presentation.
• AECOM collected five (5) residential well samples on July 30-31, 2019. Results are expected August 23, 2019.
• On August 14-15, 2019, AECOM collected six (6) residential well samples.
• On September 9, 2019, AECOM collected six (6) residential well samples.
• On September 30, 2019, Phase III Remedial Investigation activities began.
• A Restoration Advisory Board (RAB) Meeting was held on October 7, 2019. The meeting focused primarily on developing RAB meeting operating procedures. Updates on progress were given by the DMVA, DNR, and EGLE. A presentation on regional hydrogeology was also given by EGLE.
• On October 28, 2019, AECOM collected eight (8) new residential well samples and re-sampled 1 residential well.
• On November 6, 2019, a Restoration Advisory Board (RAB) Meeting was held. The meeting focused primarily on finalizing RAB meeting operating procedures and RAB communication with the public. Progress updates were given by the DMVA and EGLE. A presentation on the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) process was given by DMVA.  
• On December 11, 2019, a Restoration Advisory Board (RAB) Meeting was held. Progress updates were given by the DMVA and EGLE. A presentation on the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) process was given by DMVA. Eric Keller, Regional Director for Senator Gary Peters, gave an update on PFAS at the federal level.
• On December 19, 2019, AECOM completed the fourth quarterly groundwater sampling event.

• On January 13, 2020, a Camp Grayling Restoration Advisory Board (RAB) meeting was held. Progress updates were given by DMVA, EGLE and DHHS. Sesha Kallakuri (MDHHS) gave a presentation on risk assessment and DHHS Drinking Water Screening Levels. The RAB members continued to develop their outreach and communications plans.
• On January 30, 2020, AECOM completed drilling field work associated with Phase III of the Remedial Investigation (RI). 
• On February 10-21, 202, AECOM sampled Phase III RI monitoring wells.
• On February 20, 2020, a Camp Grayling Restoration Advisory Board (RAB) meeting was held. Progress updates were given by DMVA, EGLE and DHHS. Recent and future RAB outreach was discussed and the final RAB brochure was released.
• On April 2, 2020, AECOM completed the first Phase III quarterly sampling event. 
• On May 27, 2020, a virtual Restoration Advisory Board (RAB) was held. Progress updates were given by DMVA, EGLE, and DHHS.
• On June 15, 2020, AECOM completed the June 2020 quarterly groundwater sampling event.

• On July 22, 2020, a Camp Grayling RAB Virtual Meeting was held. Updates were given by DMVA, DHHS, and EGLE.

• On September 4, 2020, DHHS finished the first round of drinking water well resampling.
• On September 23, 2020, AECOM collected one (1) residential drinking water sample.
• On September 24, 2020, a virtual Restoration Advisory Board (RAB) was held. Progress updates were given by DMVA, DHHS, and EGLE.
• On September 30, 2020, AECOM completed the September 2020 quarterly groundwater sampling event.
• On December 1, 2020, a virtual Restoration Advisory Board (RAB) was held. Progress updates were given by the Army National Guard, the Department of Military and Veterans Affairs (DMVA), the Department of Environment, Great Lakes, and Energy (EGLE), and the Department of Health and Human Services (DHHS).

*Groundwater results are compared to EGLE Part 201 Criteria of 70 ppt PFOS+PFOA.
*Residential well results are compared to the USEPA LHA of 70 ppt PFOS+PFOA.

Sampling Notes:

• All sample counts and activities reflect "off-base" sampling efforts only.
• Sample results in the above table are from EGLE and Michigan National Guard combined.    

Historical Timeline Continued:

• On September 4, 2020, DHHS finished the first round of drinking water well resampling.
• On September 23, 2020, AECOM collected one (1) residential drinking water sample.
• On September 24, 2020, a virtual Restoration Advisory Board (RAB) was held. Progress updates were given by DMVA, DHHS, and EGLE.
• On September 30, 2020, AECOM completed the September 2020 quarterly groundwater sampling event. On December 1, 2020, a virtual Restoration Advisory Board (RAB) was held. Progress updates were given by the Army National Guard, the Department of Military and Veterans Affairs (DMVA), the Department of Environment, Great Lakes, and Energy (EGLE), and the Department of Health and Human Services (DHHS).

• On March 26, 2021, a virtual Restoration Advisory Board (RAB) was held. Progress updates were given by the Army National Guard, the Department of Military and Veterans Affairs (DMVA), the Department of Environment, Great Lakes, and Energy (EGLE), and the Department of Health and Human Services (DHHS).
• On January 21, 2021, AECOM collected drinking water samples from two residential wells.
• On April 26, 2021, a virtual town hall for Camp Grayling PFAS sites was held. The purpose of this online public meeting was to update the community about the on-going PFAS investigations and drinking water well resampling efforts.
  • April 26, 2021 MPART Camp Grayling PFAS Town Hall Recording
• On May 11, 2021, The Department of Health and Human Services (DHHS) announced that a second round of resampling of residential drinking water wells would begin.
  • May 11, 2021 DHHS Press Release
• June 9, 2021, a Camp Grayling Restoration Advisory Board (RAB) Meeting was held.
• On August 25, 2021, a Camp Grayling Restoration Advisory Board (RAB) Meeting was held.
• On September 9, 2021, MPART hosted a virtual town hall. Updates were presented by Michigan Department of Environment, Great Lakes, and Energy (EGLE), Michigan Department of Health and Human Services (MDHHS), Department of Military and Veteran Affairs (DMVA), and Army National Guard (ARNG).
  • September 9, 2021, MPART Town Hall Recording
• On November 2, 2021, a Camp Grayling RAB Meeting was held. Army National Guard gave updates on residential well resampling and the need for access agreements from homeowners that previously tested over Michigan drinking water criteria. The Army National Guard needs its own data to take action on homes exceeding criteria. They will continue resampling residential wells around Grayling Army Airfield in Spring 2022.

• On January 28, 2022, EGLE published the report of Phase III Grayling Area PFAS Investigation. The report can be found below under reports and documents. It has also been posted to the RAB website.
  • January 26, 2022 Grayling Area PFAS Remedial Investigation - Phase III (1 of 2)
  • January 26, 2022 Grayling Area PFAS Remedial Investigation - Phase III (2 of 2)
• On February 1, 2022, a Grayling Restoration Advisory Board (RAB) Meeting was held. ARNG presented the rapid site characterization process at the airfield that started in Fall 2021 and will finish in Summer 2022.
• On February 2-3, 2022, AECOM collected groundwater samples from a subset of the existing monitoring wells.
• On May 10, 2022, a Camp Grayling Public Meeting was held at Kirtland Community College. PFAS investigation updates were given by EGLE, ARNG, and DHHS.
• On July 13, 2022, a Restoration Advisory Board meeting was held at Grayling Township Hall.
• On August 5, 2022, EGLE’s contractor finished a round of biannual sampling from monitoring wells located around Grayling Army Airfield.
• On September 27, 2022, a SourceStop demonstration was held for the Camp Grayling RAB at one of the airfield PFAS source areas. This beta test treatment is being implemented as a pilot study at the GAAF in an area of known PFAS contamination. A short presentation was given by the contract company and a site visit took place after the presentation to show the test treatment being utilized.
• On November 21, 2022, a Camp Grayling RAB meeting was held. Updates on the drinking water sampling efforts around the airfield were provided by ARNG and DHHS. An update on the remedial investigation field work at the airfield was provided by ARNG.

• On January 17, 2023, a Camp Grayling RAB meeting was held to discuss updates pertaining to the Camp Grayling investigations.
• On April 11, 2023, EGLE finalized the Camp Grayling, Grayling Army Airfield, Groundwater Monitoring Report 2019 through 2022.
• On May 16, 2023, a Camp Grayling RAB meeting was held to provide updates on the Camp Grayling investigations. The day included a visit from Office of Secretary of Defense, Environment and Energy Resilience staff, to conduct interviews with regulators and RAB members for the Environmental Cleanup Communication and Outreach Initiative.
• On August 3, 2023, EGLE provided comment on the ARNG Draft Community Involvement Plan - Camp Grayling, MI.

• On April 3, 4, and 5, 2024, Grayling Township, EGLE, DHHS, DHD10, and DMVA held municipal water meetings for the initial phase of residents set to receive municipal water in 2025.  Specifics of the project were explained such as: no cost to residents (fully grant-funded), the need to abandon wells, and timeline of the project.
• On May 15, 2024, a Town Hall was held to discuss investigation updates, EGLE grant funds awarded to Grayling Township, Grayling Township’s municipal water extensions, ARNG commitment to municipal water extensions, and ARNG’s proposal for a permeable reactive barrier to limit offsite migration of PFAS in the aquifer.

• On May 9, 2025, EGLE received the draft workplan for the permeable adsorptive barrier pilot study from ARNG for review.
• On May 27, 2025, EGLE provided comments to the draft workplan for the permeable adsorptive barrier pilot study.
• On June 10, 2025, ARNG provided EGLE with a response to comments for the draft workplan for the permeable adsorptive barrier pilot study.
• On June 27, 2025, EGLE provided ARNG with a response to comments for the draft workplan for the permeable adsorptive barrier pilot study.
• In July 2025, ARNG began fieldwork and installation of a permeable adsorptive barrier pilot study in the southeast corner of GAAF.
• On July 15, 2025, ARNG held a site tour of the permeable adsorptive barrier pilot study in the morning for RAB stakeholders prior to an in-person RAB Meeting.
• On July 22, 2025, ARNG provided EGLE with a response to comments for the draft workplan for the permeable adsorptive barrier pilot study.
• On July 28, 2025, EGLE sent a Letter of Non-Concurrence to ARNG, documenting unresolved comments for the draft workplan for the permeable adsorptive barrier pilot study.
• On September 16, 2025, EGLE received the Draft Final Remedial Investigation Report from the ARNG for review.
• On October 23, 2025, ARNG provided EGLE with a written response to the Letter of Non-Concurrence and the final workplan for the permeable adsorptive barrier pilot study.
• On October 31, 2025, EGLE provided comments to ARNG on the Draft Final Remedial Investigation Report.
• On December 1, 2025, EGLE and ARNG participated in a comment discussion meeting for the Draft Final Remedial Investigation Report.
• On December 16, 2025, EGLE and ARNG participated in a resolution meeting for the GAAF permeable adsorptive barrier.

• On January 9, 2026, EGLE and ARNG participated in a resolution meeting for the GAAF permeable adsorptive barrier, and a compromise was reached to move forward with the permeable adsorptive barrier project.
• On February 4, 2026, ARNG provided EGLE with a response to comments on the Draft Final Remedial Investigation Report.
• On February 10, 2026, ARNG announced at the virtual RAB meeting that the permeable adsorptive barrier project is on hold pending completion of an Engineering Evaluation/Cost Analysis (EE/CA), citing ARNG leadership concerns.
• On February 19, 2026, EGLE provided ARNG with a response to comments on the Draft Final Remedial Investigation Report.