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Delphi Saginaw Division Plant 2 (Saginaw, Saginaw County)

EGLE Site Lead: Andrew Karg, KargA@Michigan.gov or (989) 891-6948. Webpage last updated November 19, 2020.

Background

Delphi Saginaw Division Plant 2 located at 1400 Holmes Street, was built in 1941 to support World War II (WWII).  Initially the plant was used to manufacture machine guns and then automotive and truck steering system components after WWII.  Fourteen underground storage tanks (USTs) were used to store various oils used for manufacturing.  Several subsurface investigations have been completed on-site including multiple phases of drilling and groundwater sampling.  Remedial actions completed on-site include plant decommissioning and demolition, filling or cleaning of site sewers, and groundwater collection, treatment and disposal. 

Volatile organic compound (VOC) contamination has been identified in the soil and groundwater at this site.  In 2019, PFAS was identified in groundwater on a property immediately next to this site (though no monitoring wells were above criteria).  Due to that and Delphi’s prior industrial use, EGLE requested groundwater sampling for PFAS at the Delphi Plant 2 site.  The current owner, Delphi Property Holdings Trust (DPH Trust), agreed and groundwater was first sampled for PFAS in May 2019.  One groundwater sample, collected within 100 feet of the southern property boundary in September 2019, identified a combined PFOA and PFOS concentration just above criteria.

Groundwater at the site primarily flows south-southwest toward a wetland that connects to the Tittabawassee River.  The Tittabawassee and Shiawassee Rivers meet to create the Saginaw River, which is located approximately 2,000 feet east of the property.

Delphi Saginaw Division Plant 2 Monitoring Well Map

Recent Accomplishments

  • During the summer of 2020, DPH Trust began implementing a groundwater treatment/injection plan that was approved by EGLE to help remediate the VOC contamination found in groundwater.  This process involves injecting a product into the ground to treat groundwater for VOCs.  The injection plan included continued groundwater monitoring for VOCs.  EGLE staff requested PFAS sampling be added to the monitoring plan.
  • On October 26, 2020, EGLE received a report from DPH Trust which contained sampling results from pre-injection and follow-up PFAS groundwater sampling performed in June 2020.  A total of two follow-up groundwater samples were collected and analyzed for PFAS.  One groundwater sample, collected within 100 feet of the southern property boundary, identified PFOS concentration  of 43 ppt, the other groundwater sample, collected on the adjoining property to the south, was below criteria. 

Next Steps

  • DPH Trust will begin collecting post injection sampling in November 2020 and will provide EGLE the results when available.  EGLE anticipates receiving an annual report in early 2021.

Residential Well Testing/Alternate Water Information

  • All residents in the area surrounding the former plant are serviced by a municipal water system.

Upcoming Community Engagement

  • None scheduled at this time.

Sampling Results Summary

Sampling chart reflects data compared to Part 201 Criteria effective 8/3/2020.

This chart reflects data received after 8/3/2020. Data prior to 8/3/2020 is reflected in the timeline below. 

Type of Sample

Date Sampled (or Range)

Number of Sample Results Received

Number of Samples above Criteria

Groundwater Monitoring Wells

June 2020 - May 2021 5 3
* Groundwater results are compared to EGLE Part 201 Criteria of PFOS 16 ppt and PFOA 8 ppt

Sampling Notes

  • On August 3, 2020, new Part 201 Criteria went into effect.  Historical sampling data compared to Part 201 Criteria >70 is captured in the historical timeline below. 

Historical Timeline

    • In May 2019, upon request by EGLE, DPH Trust had their consultant (Tetra Tech) sample nine on-site monitoring wells for PFAS.  All wells had detections of PFAS, but all wells were below 70ppt PFOA+PFOS.   
    • In September 2019, a second groundwater sample event was performed in the same nine monitoring wells.  All wells had detections of PFAS, but only one well had a result above 70ppt PFOA+PFOS (71 ppt).  
    • On October 29, 2019, two surface water samples were collected from the Saginaw River.  One sample was collected in close proximity to the site and the other was collected approximately 1.6 miles downstream.  Both surface water samples collected were below the non-drinking water standards and are reflected on the sampling chart below.
    • EGLE was informed by DPH Trust that follow-up PFAS sampling was completed in summer 2020 and the sampling results would be provided in a report to EGLE in fall 2020.

     

    Historical Sampling Chart: Data is reflective of criteria prior to August 3, 2020,  PFOS and PFOA Only

    This chart reflects data received prior to August 3, 2020. 

    Type of Sample

    Date Sampled (or Range)

    Number of Samples

    Number of Results Received

    Number of Non-Detects  Number Between Non-detect and Standard*  Number Greater Than or Equal to Standard 

    Groundwater

    May 2019 - September 2019 18 18 0 17 1
    Surface Water October 2019 2 2 0 2 0
     Cumulative   20 20 0 19 1

    *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.

     

     

    • During the summer of 2020, DPH Trust began implementing a groundwater treatment/injection plan that was approved by EGLE to help remediate the VOC contamination found in groundwater.  This process involves injecting a product into the ground to treat groundwater for VOCs.  The injection plan included continued groundwater monitoring for VOCs.  EGLE staff requested PFAS sampling be added to the monitoring plan.
    • On October 26, 2020, EGLE received a report from DPH Trust which contained sampling results from pre-injection and follow-up PFAS groundwater sampling performed in June 2020.  A total of two follow-up groundwater samples were collected and analyzed for PFAS.  One groundwater sample, collected within 100 feet of the southern property boundary, identified PFOS concentration  of 43 ppt, the other groundwater sample, collected on the adjoining property to the south, was below criteria.