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Metamora Landfill Superfund Site (Metamora, Lapeer County)

EGLE Site Lead: Erik Martinson, MartinsonE@Michigan.gov. Webpage last updated January 6, 2021.

Background

Metamora Landfill is a capped landfill located at 1811 Dryden Road, about 25 acres in size with no bottom liner. The landfill was closed in 1980 for failure to meet requirements under the Solid Waste Management Act, PA 641 of 1978, as amended. Although licensed to receive only general refuse, large amounts of industrial wastes (e.g., tens of thousands of 55-gallon drums) were also disposed of at the site. Remediation at the site has been handled through two discrete actions called operable units (OUs). OU1, Drummed Waste and Contaminated Soil, addressed the remediation of drummed waste and contaminated soils in two (Drum Area 1 and Drum Area 4) of the five known drum areas on-site. OU2 includes Landfill Capping and Monitored Groundwater Natural Attenuation.

The PFAS workplan was developed and approved by EGLE and EPA in January 2020. The initial PFAS sampling event was completed in early April and included a subset of site monitoring wells located in different aquifers across the site. 

Groundwater flow varies in each of the three aquifers present at the Metamora Landfill site. These aquifers are essentially zones of water. Groundwater generally flows to the northeast in the shallow aquifer, to the north with radial flow in portions of the intermediate aquifer, and to the north/northeast/northwest in the bedrock aquifer.

The primary receptor identified the site is residential drinking water. Residential drinking water wells extend down through the soil and pull water in from the bedrock aquifer. While there weren’t any PFAS detections during the initial PFAS sampling event, previous site investigations have demonstrated a migration pathway from the shallow aquifer to the underlying bedrock aquifer.

Metamora Landfill Superfund Site Map

Recent Accomplishments

  • During June, July, and August 2020 groundwater investigation continued with the installation of several vertical aquifer sampling (VAS) locations along with the installation of five monitoring wells to assist with plume delineation.
  • On September 30, 2020, PFAS samples were collected from four residents located downgradient from the landfill. These four locations were selected based upon landfill contaminants that are currently detected in their well. All four residents have and continue to be provided alternate drinking water.
  • On November 10, 2020, EGLE received the results from these four residential locations that were sampled in September 2020, all of the sample results were below applicable criteria. 

Next Steps

  • Ongoing discussions are being held to determine further PFAS sampling at monitoring wells and residential well locations.

Residential Well Testing/Alternate Water Information

  • EGLE is aware of approximately 36 residential wells nearby and is working with the local health department to determine a sampling strategy.

Upcoming Community Engagement

  • A virtual town hall will be scheduled sometime in February 2021 to discuss PFAS results and to communicate next steps.

Sampling Results Summary: PFOS and PFOA Only

Type of Sample

Date Sampled (or Range)

Number of Sample Results Received

Number of Samples above Criteria*

 Residential Wells September 30, 2020 4 0

Groundwater Monitoring Wells

April 4-6, 2020 18 3

* Residential well and groundwater monitoring well results are compared to EGLE Part 201 criteria for 7 PFAS compounds:  PFOS (16 ppt), PFOA (8 ppt), PFNA (6 ppt), PFHxS (51 ppt), PFHxA (400,000 ppt), PFBS (420 ppt), and HFPO-DA (370 ppt).

Sampling Notes

  • None at this time.

Historical Timeline

    • In January 2020, additional monitoring wells were installed to supplement the current monitoring well network.
    • In April 2020, GHD contracted by Metamora Landfill, collected 18 groundwater samples from various on-site monitoring wells.
    • On May 19, 2020, EGLE received the groundwater sample results.  The highest groundwater sample result was 25 ppt for PFOA.