Washtenaw County, Dexter, Chrysler Scio Introl Division

Updated: January 16, 2020

BackgroundChrysler Scio Facility Map

The former Chrysler Scio Introl Division is located at 2880 Zeeb Road, Dexter.  This facility was a former Chrysler plant that historically conducted several manufacturing operations related to the automobile industry, including plating.  The facility is regulated as a hazardous waste treatment, storage, and disposal facility and is required to conduct actions to eliminate any potential exposures to contamination at the site.  Such corrective actions have been ongoing for approximately 10 years.  In 2018 PFAS was detected; however, the results were below the 70 ppt criteria.  In 2019, further investigation detected concentrations above the 70 ppt criteria on the portion of the site that is away from the river.

The site is located on the Huron River.  Groundwater flows to the south/southeast, toward the Huron River.  The city of Ann Arbor uses water from the Huron River as part of its drinking water supply; an intake is located downstream, approximately four miles from the site.

Recent Accomplishments

  • On December 4, 2019, EGLE provided comments on the draft report and recommended next steps of investigation to the facility.   
  • On January 16, 2020, a new map was updated to this webpage.

Next Steps

  • It is anticipated that next steps will include additional investigation, another sampling of the on-site drinking water supply well, and an initial feasibility evaluation of potential remedial alternatives. Finalization of the report which will include EGLE’s recommended next steps of the investigation is expected to occur in early January 2020.

Residential Well Testing/Alternate Water Information

  • The on-site supply well has been tested and had a PFOS+PFOA of 9 ppt which is below the drinking water standard of 70 ppt. 
  • All on-site contamination is venting to the Huron River; therefore, nearby residences are not impacted, and no alternate water supply is required.

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

Monitoring Wells

2018 - Present 53 53 6 41 6
Stormwater Outfalls Feb 2019 5 5 1 4 0

Cumulative

  58 58 7 45 6

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

Former Chrysler Scio Introl Division Historical Timeline

The former Chrysler Scio Introl Division is located at 2880 Zeeb Road, Dexter.  This facility was a former Chrysler plant that historically conducted several manufacturing operations related to the automobile industry, including plating.  The facility is regulated as a hazardous waste treatment, storage, and disposal facility and required to conduct actions to eliminate any potential exposures to contamination at the site.  Such corrective actions have been on-going for approximately 10 years.  In 2018 PFAS was detected, however the results were below the 70 ppt criteria. Further investigation in 2019 detected concentrations internal to the site above the 70 ppt criteria.  

The site is located on the Huron River.  Groundwater flows to the south/southeast, toward the Huron River.  The city of Ann Arbor uses water from the Huron River as part of its drinking water supply; an intake is located downstream, approximately four miles from the site.

  • On March 12, 2019, the facility’s consultant collected groundwater samples.
  • On April 30, 2019, EGLE received the results of the March sampling event.  The highest PFOS+PFOA groundwater result was 1,700 ppt.
  • In the summer of 2019, additional plume delineation and source investigation were conducted.
  • On October 22, 2019, EGLE received the initial draft report of the work performed in the summer of 2019. The data in the report indicates PFOS concentrations is venting to the Huron River above criteria at one location.