Genesee County, Flint, Coldwater Road Landfill

Updated: January 8, 2020

Aerial Map of Coldwater Road Lanfill, 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 October 29, 2019, RACER began the next phase of PFAS investigation, which will involve the installation of new monitoring wells, soil and groundwater sampling, and berm construction in the wetland area.

Next Steps

  • RACER has submitted a permit to construct a berm in the wetland area to assist with containing water onsite. RACER is currently addressing comments provided by the county.
  • On January 28, 2020, RACER and EGLE will be meeting to discuss latest sampling results and next steps for investigation and remediation. The sampling data table will be updated once EGLE receives the lab data.

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 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: PFOS and PFOA Only

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 -
Jul 19, 2018
121 121 80 15 26
Surface Water Oct 2018 - Apr 2019 16 16 0 0 16

Cumulative

  149 149 89 17 43

*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

Sampling notes

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

Coldwater Road Landfill Historical Timeline

This site is located at 1245 Coldwater Road 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.

  • 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, the Michigan Department of Environment, Great Lakes, and Energy (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.