Coldwater Road Landfill & Peregrine, Flint, Genesee County

Last Updated: August 19, 2021

EGLE Site Lead:
Nicole Sanabria
SanabriaN@Michigan.gov
517-281-7726

Aerial Map of Coldwater Rd. Landfill and Peregrine site, Flint Genesee County

Background

This site is located at 1245 Coldwater Rd. in Flint. There is a drinking water restriction at this location, and a landfill leak detection system is in place. Surrounding properties to the south and west of the facility are on a municipal water supply.

Recent Accomplishments

  • On May 20, 2021, RACER completed additional storm and sanitary sewer sampling off-site.
  • During the week of June 7, 2021, annual groundwater sampling for PFAS occurred on-site in select monitoring wells.
  • On July 6, 2021, RACER provided a report regarding results from the May 2021 sewer sampling. EGLE is currently reviewing this report.
  • On August 18, 2021, EGLE received the annual groundwater report for PFAS sampling. Results were consistent with other sampling events and did not present any new concerns.

Next Steps

  • Additional storm and sanitary sewer sampling is expected to occur in August and November 2021 to determine if repairs were effective in reducing PFAS concentrations.
  • Sewer rehabilitation and lining is expected to occur in select storm and sanitary sewers in the fall of 2021.

Residential Well Testing/Alternate Water Information

  • There is no known impact to the drinking water aquifer. Further investigation is needed on the impacted residential well to confirm this. Quarterly monitoring will occur to assess aquifer conditions.
  • Residential well testing reflected on this report has been conducted by RACER and the Michigan Department of Environment, Great Lakes, and Energy (EGLE).
  • For additional information on residential well testing and results, visit the Frequently Asked Questions.
  • EGLE has sampled all municipal water supplies for PFAS. The city of Flint purchases water from the Great Lakes Water Authority (GLWA). View the results for GLWA

Upcoming Community Engagement

  • None scheduled at this time.

Sampling Results Summary

This chart reflects data received after 8/3/2020.  Data prior to 8/3/2020 is reflected in the timeline below. 
This table was updated to include all seven PFAS criteria effective 12/21/2020.

Type of Sample

Date Sampled

Number of Sample Results Received

Number of Samples above Criteria*

Surface Water August 2020 - May 2021 50 40
Groundwater December 2020 12 9

* 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. Includes storm and sanitary sewer sampling results.

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.
  • Other PFAS analytes were detected in samples. There are no federal or state standards for these analytes.
  • Sumps, vaults, soil, storm water, and sanitary sewers at the site have been tested and have detections of PFAS.

Historical Timeline

  • In November 2016, the RACER Trust conducted an initial investigation of groundwater monitoring wells at the Coldwater Road Landfill. Three samples were collected; two samples were above 70 ppt PFOA+PFOS.
  • In June 2017, RACER conducted a second and more comprehensive sampling event to further delineate the extent of PFAS at the facility. 19 groundwater monitoring well samples were collected; 11 samples were above 70 ppt PFOA+PFOS.
  • In December 2017, RACER conducted additional sampling to determine if PFAS is moving offsite; three samples were taken. One sample was above 70 ppt PFOA+PFOS.
  • In July 2018, RACER completed sampling to further characterize PFAS onsite. PFAS was detected in the drift aquifer above 70 ppt PFOA+PFOS, and as a result, it was determined that residential wells should be tested.
  • In September 2018, RACER and EGLE sampled 8 residential wells. All were non-detect except one, which had 73 ppt PFOS. Three additional residential wells next to this house have recently been sampled. Two were non-detect, and one had 7 ppt PFOS. RACER resampled this home in December. This result has not yet been received.
  • In October 2018, RACER conducted sampling of monitoring wells, wetland surface water, and storm sewers onsite.
  • In November 2018, RACER developed a plan for block the storm sewers onsite, and to build a berm in the wetland area to prevent water from moving offsite. This plan has been approved.
  • In November 2018, RACER collected 9 shallow groundwater samples near the home with PFAS in the drinking water to the northeast, as well as in the residential areas west of the landfill.
  • November 2018 - As a result of the contaminated residential well, the RACER Trust (RACER) sampled three more nearby homes. Two were non-detect, the third had 7 ppt of PFOS. RACER resampled this home in December to confirm this. Resample results showed 6 ppt PFOS.
  • December 2018 - RACER bulkheaded the sewer onsite in two locations and has constructed a berm in the wetlands to keep PFAS from moving offsite.
  • February 2019 - EGLE, RACER, GCHD, and the City of Flint met to update all parties on current activities at the site.
  • On February 28, EGLE, RACER, GCHD, and the homeowner with the well over 70 ppt met to discuss next steps.
  • On March 8, 2019, EGLE and MDHHS presented at a Town Hall event held by Representatives John Cherry, Sheldon Neely, Sheryl Kennedy, and Tim Sneller at Mott Community College in Flint.
  • April 2019 - RACER completed additional groundwater sampling of shallow perched groundwater, stormwater, soil, and surface water sampling in the wetland area.
  • April 2019 - RACER completed grouting work on the storm sewer system and plugged additional manholes onsite to keep PFAS from leaving the site.
  • In May 2019, an additional drinking water well was sampled. The property owner was not available during the initial round of sampling in 2018. PFOS was 7 ppt.
  • On May 28-31, annual sampling for PFAS occurred for all monitoring wells onsite. EGLE has not received results yet.
  • July 2019 - Storm sewer sampling and investigation to determine source of PFAS in storm sewers.
  • In August 2019, RACER finalized installation of new residential well and whole-house filtration system for the resident with PFOS exceedance in their drinking water.
  • On August 29, 2019, EGLE met with RACER to discuss recent PFAS sampling results and next steps for site investigation and remediation. Results are reflected in the table.
  • On September 30, 2019, EGLE approved RACER's workplan for the next phase of PFAS investigation on-site.
  • On October 29, 2019, RACER began the next phase of PFAS investigation, which involves the installation of new monitoring wells, soil and groundwater sampling, and berm construction in the wetland area.
  • On January 28, 2020, RACER and EGLE met to discuss latest sampling results and next steps for investigation and remediation. The sampling data table has been updated with these new results.
  • In March 2020, RACER began the next phase of investigation, which includes storm and sanitary sewer sampling, and offsite groundwater sampling. Completion of some items may be delayed due to COVID-19.
  • In April 2020, RACER completed another phase of investigation, including storm and sanitary sewer sampling, and offsite groundwater sampling.
  • On May 6, 2020, RACER and EGLE met to discuss results from March sampling and discuss next steps forward. The sampling results table has been updated to reflect these results.
  • On May 29, 2020, RACER submitted a workplan for the next phase of investigation, and EGLE is currently reviewing it.
  • On July 2020, the permit was approved to construct a berm in the wetland area to help contain water onsite.
  • On July 2020, the permit was approved to construct a berm in the wetland area to help contain water onsite.
  • On August 3, 2020, the former industrial property to the south, known as Peregrine, was combine with the Coldwater Rd. Landfill property due to the new Part 201 Groundwater Criteria. All data associated with Peregrine sampling is already included in the data table.  The site name was changed from Coldwater Landfill to Coldwater Road Landfill & Peregrine.
    • Historical Sampling Chart: data is reflective of criteria prior to 8/3/2020:
      PFOS + PFOA Only
      This chart reflects data received prior to 8/3/2020.

      Type of Sample

      Date Sampled

      # of Samples

      # of Results Received

      # of Non-detects

      # Between Non-detect and standard*

      > Standard

      Drinking Water (Residential) Sep 2018 - May 2019 12 12 9 2 1

      Groundwater

      Nov 2016 -
      Present
      135 135 86 20 29
      Surface Water Oct 2018 -
      Present
      25 25 1 0 24

      Cumulative

        172 172 96 22 54

      *Residential well results are compared to the USEPA Lifetime Health Advisory Level of 70 ppt PFOS+PFOA.
      *Groundwater results are compared to EGLE Part 201 Criteria of 70 ppt PFOS+PFOA.
      *Surface water results are compared to Rule 57 surface water quality values of 12 ppt for PFOS and 12,000 ppt for PFOA

  • On August 6, 2020 RACER began the next phase of investigation on the storm and sanitary sewers, as well as construction of the berm in the wetland area to assist with containing water onsite. 
  • On October 7, 2020, RACER and EGLE met to discuss status of investigation, results from most recent phase of investigation, and the path forward.
  • On October 21, 2020, RACER submitted results to EGLE from the last round of sampling that included storm and sanitary sewer sampling. These results are reflected in the sampling table.
  • On December 17, 2020, RACER completed additional offsite groundwater sampling and did not detect PFAS above the MCLs in those samples. Results have been added to the table.
  • On December 18, 2020, RACER completed additional storm and sanitary sewer sampling to determine if sewer repairs were successful in reducing PFAS concentrations.
  • On February 9, 2021, EGLE received a report from RACER containing results from the December 2020 storm and sanitary sampling. While concentrations in some areas were reduced, some results were still above the Rule 57 criteria for PFOS at 12 ppt. Results have been added to the table. RACER will resample in March 2021.
  • On March 11, 2021, RACER collected additional storm and sanitary sewer samples in 10 locations.
  • On April 6, 2021, RACER provided results on the March 2021 storm and sanitary sewer sampling. Results were similar to the December 2020 event. The table has been updated with results.
  • On April 8, 2021, RACER completed additional sanitary sewer repairs to attempt to reduce PFAS concentrations in the sewer.