Eaton/Clinton County, Grand Ledge, Grand Ledge Army Aviation Support Facility

Grand Ledge AASF Investigation MapUpdated: January 6, 2020

Background

This site is located at 10600 West Eaton Highway. Grand Ledge Army Aviation Support Facility (AASF) and Armory provides training and maintenance for the various aviation units that support the Michigan Army National Guard (MIARNG). The Armory (former location of the AASF) historically housed a firefighting unit in the 1980s that was disbanded in the early 1990s.

Recent Accomplishments

  • On November 26, 2019, MIARNG held a conference call with EGLE, and local and state health departments to discuss issues with installing the proposed deep monitoring wells and in lieu of installing them, sampling residential wells instead.
  • On December 10, 2019, MIARNG held a conference call to discuss the upcoming Town Hall Meeting.
  • On December 19, 2019, a town hall meeting was conducted to update the community on the currently known site conditions and the upcoming residential well sampling efforts.   

Next Steps

  • MIARNG initiated additional investigation activities at the site during the week of November 11, 2019.  The additional activities were to  include installation and sampling of three shallow groundwater wells, four deep groundwater wells, five surficial soil samples and five surface water/sediment samples.  Due to equipment issues with installing the deeper wells, residential well sampling has been added instead.
  • Residential well sampling is expected to be completed during January 2020.

Residential Well Testing/Alternate Water Information

  • Included in EGLE’s August 2, 2019 request to MIARNG for sampling are 14 residential homes/wells in the area. MIARNG is currently in the process of securing access to the properties to conduct the residential well sampling in January.

Upcoming Community Engagement

  • No Community Engagement Events are planned at this time.
Sampling: PFOS and PFOA Only

Type of Sample

Date Sampled

# of Samples

# of Results Received

# of Non-detects

# Between Non-detect and standard*

# > Standard

Groundwater

May 2019 9 9 6 2 1
Surface Water May 2019 3 3 0 1 2

Cumulative

  12 12 6 3 3

*Groundwater results are compared to EGLE Part 201 Criteria of 70 ppt PFOS+PFOA.
*Surface water results are compared to Rule 57 surface water quality values of 12 ppt (PFOS) and 12,000 ppt (PFOA).

Sampling notes

  • Data above shows only groundwater and surface water samples. The May 2019 sampling effort included 27 soil samples and 3 sediment samples. Results will be shared with EGLE in a complete written report, expected upon completion of all phases of the Site Inspection(s).

Grand Ledge Army Aviation Support Facility (AASF) and Armory Historical Timeline

This site is located at 10600 West Eaton Highway. Grand Ledge Army Aviation Support Facility (AASF) and Armory provides training and maintenance for the various aviation units that support the Michigan Army National Guard (MIARNG). The AASF facility consists of a facility maintenance shop, office areas, a maintenance hangar, wash bay, and an unheated “cold” storage building. The Armory includes a shop area, fenced motor pool, aircraft parking area, and various small storage buildings. An Annex Building that is used for storage and training purposes, including flight simulations, is on the south western portion of the property. The Armory (former location of the AASF) historically housed a firefighting unit in the 1980s that was disbanded in the early 1990s.

  • On May 8-9, 2019, the Michigan Department of Military & Veterans Affairs (DMVA)’s contractor AECOM, collected a total of 42 samples on the property due to historic storage and suspected use of aqueous film forming foam (AFFF) containing PFAS. Those 42 samples included groundwater, surface water, sediment, and soil samples.
  • On July 22, 2019, the Michigan Department of Environment, Great Lakes, and Energy (EGLE) received a map with the results for the groundwater and surface water samples. The complete written report from DMVA, which will include the results for the sediment and soil sampling, is expected in October.
  • On August 2, 2019, EGLE sent MIARNG a request to: conduct residential well sampling; identify and mitigate other receptors and potential exposure pathways; notify all affected parties of site conditions; and define the extent of the contamination.
  • On September 5, 2019, EGLE contacted the following local municipalities to update them on the status of this site:  Mid-Michigan Health Department, Barry-Eaton County Health Department, Michigan Department of Health and Human Services, the City of Grand Ledge, Oneida Township, and Eagle Township.
  • On September 12, 2019, EGLE and MIARNG held a conference call to discuss MIARNG’s acknowledgement that additional work is needed at this site and to coordinate a response to all separate EGLE division concerns into one response effort to be submitted by October 17, 2019.
  • On October 30, 2019, EGLE received a Final Site Inspection Supplemental Quality Assurance Project Plan Addendum from MIARNG.  The purpose of this plan is to conduct additional field work to address EGLE concerns generated from the initial site investigation.
  • On November 5, 2019, MIARNG provided EGLE with the Final Preliminary Assessment Report