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Grede LLC Iron Mountain (Grede Landfill) (Kingsford, Dickinson County)

Disclaimer
Web content may not routinely be updated on this page. Please contact the Site Lead for the most up-to-date status of the site.
Content posted November 2022.

EGLE Site Lead

Mary Ann St. Antoine, StAntoineM@Michigan.gov or 989-270-8035.

Background

Grede Landfill, located at 801 South Carpenter Avenue, Kingsford, is a three-acre Type III landfill that accepted foundry sands and associated wastes generated by Grede Foundry. The landfill quit accepting wastes in 1991 and was capped and closed in 1993. Hydrogeological investigations that started in 1985 showed groundwater impacts, including metals and other contaminates.  Due to the groundwater contamination caused by the landfill, and the possibility that there were PFAS-containing wastes in the landfill, EGLE requested that Grede Landfill sample the groundwater for PFAS.

Groundwater flow is to the south/southeast, toward the Menominee River.  The area downgradient from the landfill is served by municipal water. However, there are four downgradient residential drinking water wells that have been confirmed by local health department.

Grede Landfill map

Recent Accomplishments

  • On December 17, 2019, Grede Landfill consultant, GEI, collected groundwater samples from four monitoring wells. One well showed concentrations of PFOA at 12 ppt; the results did not exceed Michigan’s ground water criteria at the time. In February 2022, Michigan’s criteria was updated to 8 ppt PFOA, and the concentration of 12 ppt PFOA exceeded criteria. EGLE requested that Grede Landfill resample well B07D to confirm the exceedance.
  • On June 12, 2021, Grede Landfill consultant GEI collected groundwater samples from monitoring well B11P, and although results showed there were some detections of PFAS chemicals, there were no exceedances.
  • On June 21, 2022, Grede Landfill consultant, GEI, collected groundwater samples for monitoring well B07D.The resulting concentration of PFOA at 8.2 ppt was above groundwater criteria of 8 ppt.

Next Steps

  • Grede Landfill will continue routine groundwater monitoring.
  • Downgradient residential wells will be sampled for PFAS.

Residential Wells / Alternative Water Information

  • The area is served by municipal water.
  • Four downgradient residential drinking water wells are planned to be sampled for PFAS.

Upcoming Community Engagement

  • None scheduled at this time.

Sampling Results Summary

Type of Sample

Date Sampled
(or range)

Number of Sample Results Received

Number of Samples above Criteria*

Groundwater Monitoring Wells

December 2019 – June 2022

6

2

* Residential well and groundwater monitoring well results are compared to EGLE Part 201 criteria for 7 PFAS compounds effective 12/21/2020:  PFOS (16 ppt), PFOA (8 ppt), PFNA (6 ppt), PFHxS (51 ppt), PFHxA (400,000 ppt), PFBS (420 ppt), and HFPO-DA (370 ppt).

Sampling Notes (if applicable)

  • None at this time.