Last Updated: December 4, 2020
Summary: Since March 2019, the Michigan Department of Environment, Great Lakes and Energy (EGLE) has requested to sample approximately 475 residential drinking water wells in the area "Trout Creek" (in the neighborhood east of the 36th Street exits off I-96, west of the Thornapple River), for PFAS as part of the ongoing investigation of potential PFAS contamination sources in Cascade Township. This area was selected due to its proximity to known and potential PFAS sources and local geologic features. Samples were collected from only those properties where EGLE was given permission; 364 samples were collected in five phases.
Residential drinking water well results summarized below are compared to the new Part 201 cleanup criteria of PFOA 8 ppt and PFOS 16 ppt effective August 3, 2020.
|PFOS and PFOA||Range Total Tested PFAS|
In addition to the above exceedances of PFOS and PFOA there was one residential well that exceeded the maximum contaminant level of 6 ppt PFNA with a result of 9.1 ppt.
Residents have been notified of their results, and in response, the Kent County Health Department offered point-of-use filters to each household with a detection of any PFAS compound.
Through five sampling phases, EGLE has attempted to sample all the residential drinking water wells known to EGLE in the area south of 28th Street, west of the Thornapple River, east of the 36th Street exit off I-96, and north of the M-6 exit off I-96. Therefore, no additional residential drinking water well sampling will occur at this time.
NOTE: Residents previously sampled as part of the sampling efforts by Gerald R. Ford International Airport or by Lacks Industries will not be resampled. Residents who provided independent PFAS results that were non-detect will not be contacted.
This project is not associated with the Lack's Industries (Cascade) project or properties with residential drinking water wells north of 28th Street, east of the Thornapple River, west of the 36th Street exit off I-96 or south of the M-6 exit off I-96.
Through five sampling phases, EGLE has sampled 364 residential drinking water wells. PFAS was detected in more than 60 percent of results indicating a need to pursue a long-term solution, protective of public health for a large area. EGLE has begun to focus on pursuing a long-term solution that would consider all sampled and non-sampled drinking water wells south of 28th Street, west of the Thornapple River, east of the 36th Street exit off I-96 and north of the M-6 exit off I-96.
EGLE will also continue to evaluate all commercial activities near Cascade Township that have, or may have used, materials containing PFAS as part of their operations. In addition to the two known PFAS sources, Lack's Industries - Cascade, and Gerald R. Ford International Airport (GFIA), EGLE is also evaluating the sampling results from EGLE's Industrial Pre-treatment Program (IPP). The information gathered from the IPP identified other PFAS users in the area, but at locations without confirmed releases of PFAS-containing materials to the environment. In addition, EGLE completed an internal geologic review of the area surrounding GFIA and concluded that the relationship of known PFAS conditions in the area and the local geology warranted further investigation in the area northeast of GFIA. Specifically, the review recommended that this be accomplished through private residential drinking water well sampling.
For questions, contact the EGLE Remediation and Redevelopment Division's project manager, Aaron Assmann, by email AssmannA@Michigan.gov or by phone 616-430-5275.
To receive future updates from EGLE on this investigation, sign up for the "Cascade Township Residential Wells Sampling and PFAS Analysis" GovDelivery list.