Isabella County, Mt. Pleasant, Mt. Pleasant City Landfill

Updated: May 11, 2020

BackgroundMt Pleasant City Landfill Map

The old Mt. Pleasant city dump/landfill is located at 1301 North Franklin Street. The property is owned by the city of Mt. Pleasant and within the boundaries of the Saginaw Chippewa Reservation. The site became a suspected source of PFAS after the city of Mt. Pleasant sampled water from clay tiles that drain near the dump and empty into the Chippewa River. (The tile/drain sampling results also revealed the drains were illicit discharges, which the city has since fixed). To confirm the dump as a source, two monitoring wells were installed at the edge of the landfill and sampled. Both groundwater well results were over 70 ppt PFOS+PFOA.

The Chippewa River is located adjacent to the facility.  While it is believed that groundwater flows toward the Chippewa River, additional monitoring wells will be installed in the near future to verify that.

Recent Accomplishments

  • On March 23, 2020, EGLE received analytical results for 5 monitoring wells sampled on February 17, 2020.  EGLE is waiting on analytical data from monitoring wells that were installed recently. 

Next Steps

  • EGLE will review analytical data when received and will follow up with the city of Mt. Pleasant on tile repairs.

Residential Well Testing/Alternate Water Information

  • The need for residential well sampling will be evaluated after data generated from the additional monitoring wells is evaluated. Data should be available by the end of March 2020.

Upcoming Community Engagement

  • None scheduled 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

Jun 28, 2019 - present 9 9 0 0 9

Cumulative

  9 9 0 0 9

*Groundwater results are compared to EGLE Part 201 Criteria of 70 ppt PFOS+PFOA.

Sampling notes

  • EGLE conducted recent fish tissue sampling in the Chippewa River adjacent to this site both upstream and downstream.  Results did not indicate a concern with regards to PFAS.

Historical Timeline

  • On June 28, 2019, the city of Mt. Pleasants consultant, AKT Peerless Environmental Services (AKT) collected two samples from on-site monitoring wells.
  • On July 16, 2019, AKT collected two samples from the clay tiles that discharge into the Chippewa River.
  • On August 6, 2019, EGLE received the results from the June 2019 sampling event.  The highest monitoring well PFOS+PFOA result was 250 ppt.
  • On August 6, 2019, EGLE received the results from the samples collected from the clay tiles.  The highest PFOS+ PFOA result was 124 ppt.
  • On September 17, 2019, EGLE received an updated summary report from AKT which included recommendations to install additional monitoring wells.
  • On November 26, 2019, additional monitoring wells as proposed in the updated summary report from AKT were installed within the footprint of the landfill in order to characterize the leachate.
  • On February 5, 2020, additional monitoring wells proposed in the updated summary report from AKT were installed along the perimeter of the landfill.  It was discovered, the clay tiles that had been fixed previously, appear to be leaking due to erosion of the Chippewa River.  Repairs, including grouting and recapping are underway.