Updated: November 12, 2019
Summary: Since March 2019, the Michigan Department of Environment, Great Lakes and Energy (EGLE) has requested to sample approximately 180 residential drinking water wells along “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 and 156 samples were collected in three phases. Results are summarized below and in the provided figures:
|Range PFOS+PFOA (ppt)||Range Total Tested PFAS (ppt)|
Each result is below the United States Environmental Protection Agency (USEPA) Lifetime Health Advisory (LHA) level of 70 parts per trillion (ppt) for PFOS+PFOA. The highest PFOS+PFOA result was 67.1 ppt and the highest Total PFAS result was 150 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.
Based on the results of the first three sampling phases, EGLE will expand its sampling area to a fourth phase of residential wells immediately around those locations where the highest PFAS concentrations were detected. Starting the week of November 18, EGLE will request access to sample 139 additional residential drinking water wells, which includes all Phase 3 wells that were not already sampled. The Phase 4 expansion extends east to the Thornapple River, north of Woodbrook Drive, and slightly northwest along Burger Drive and Brookhills Court.
EGLE has contacted property owners in the fourth phase sampling area through postage mail and will go door-to-door in an attempt to schedule a sampling appointment.. EGLE is aware that some properties in the Phase 4 expansion may be connected to municipal water. If you are contacted by EGLE with a sample request and your property is already connected to municipal water, please indicate this on your questionnaire and return as normal. Thank you.
Residents who are not contacted but believe they may be in the study area can contact the EGLE Remediation and Redevelopment Division’s project manager Aaron Assmann at firstname.lastname@example.org or 616-430-5275.
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.
Once collected, Phase 4 sample results could take 8 weeks to return. Once results become available, they will be mailed to property owners to an address of their choice, along with an explanation of the results compared to health advisory levels. The results will be shared with the Michigan Department of Health and Human Services (MDHHS) and the Kent County Health Department so that they can help answer any health-related questions and take the appropriate action regarding public health. EGLE will evaluate the collection of results to determine appropriate next steps that could include expanding the sampling area.
Note: 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.
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.