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State Secondary Complex (Dimondale, Eaton County)

EGLE Site Lead: Kim Sakowski, SakowskiK@Michigan.gov or 517-582-2219. Content last updated October 4, 2022.

Background

The State Secondary Complex is located at 7426 North Canal Road. The Delta Township Waste-Water Treatment Plant (WWTP) identified PFAS at their facility during routine monitoring.  Potential sources were investigated, and it was determined that a branch of the storm sewer system running along the Michigan State Police (MSP) Training Building within the Secondary Complex was the source of the PFAS identified at the WWTP.

Groundwater flow direction has been determined to be east and southeast towards the Grand River which is approximately a half-mile away.

State secondary complex map

Recent Accomplishments

  • On April 20, 2022, EGLE’s contractor collected drinking water samples at one home and three businesses. Sample results were received on April 26, 2022. All results were non-detect for PFAS.
  • On May 19-20, 2022, DTMB conducted additional sampling of soil, groundwater and surface water at the Secondary Complex to try to define the extent of contamination. Results were provided to EGLE on July 1, 2022. Sampling identified three data gaps that needed additional investigation.

Next Steps

  • DTMB will collect additional PFAS samples beginning in September 2022 to address data gaps; EGLE will review sample results when received and determine next steps to be taken in consultation with DTMB.

Residential Well/Alternate Water Information

  • Municipal water is available in the area. EGLE, DHHS, and local health identified six drinking water wells within one mile of the site. Drinking water well sampling was conducted on April 20, 2022, at one home and 3 businesses; results were non-detect 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 January 21, 2022 - May 20, 2022 26 10
Residential Wells April 20, 2022 4 0
Surface Water January 21, 2022 - May 20, 2022 3 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).
* Surface water samples are compared to Rule 57 non-drinking water values of 12 ppt for PFOS and 12,000 ppt for PFOA. 

Sampling notes

  • None at this time.

Historical Timeline

  • In December 2021, Delta Township Wastewater Treatment Plant notified EGLE that sample results indicated the Secondary Complex was a source of PFAS.
  • On January 21, 2022, Department of Technology Management and Budget (DTMB) conducted sampling of soil, groundwater, and surface water along the storm sewer corridor to try to determine how PFAS was getting into the storm sewer.
  • On February 16, 2022, EGLE received the sample results. The highest result in groundwater was 3,300 ppt PFOS.
  • On March 4, 2022, representatives of EGLE, DTMB, and MSP met to discuss initial sample findings and to determine next steps.
  • On March 7, 2022, DTMB televised the sewer lines to evaluate the condition of the piping and to identify if any cracks existed. Ultimately, six manholes were lined along with approximately 12 feet of ductal iron.
  • Beginning in March 2022, DTMB began additional investigation which included identifying any historic PFAS uses on the property and developed a sampling plan to determine if PFAS is leaving the Secondary Complex and to try to determine any “hot spot” areas that may need targeted remediation.
  • On May 9, 2022, a meeting was held with local officials and the site was officially added to MPART.