Updated: May 16, 2019
Summary: In March, the Michigan Department of Environment, Great Lakes and Energy (EGLE) requested to sample approximately 50 residential drinking water wells along “Trout Creek” in the neighborhood east of the 36th Street exits off I-96 and west of Tricklewood Drive 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 33 samples were collected. Results are summarized below.
|Range PFOS+PFOA (ppt)||Range Total Tested PFAS (ppt)|
Each result was 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 54.8 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 will offer point-of-use filters to each household with a detection of any PFAS compound.
EGLE will expand its sampling area to wells along Trout Creek east of Tricklewood Drive to the Thornapple River and around those locations where the highest PFAS concentrations were detected. The second phase sampling area consists of 67 residential drinking water wells and includes all wells that were not sampled in phase one.
EGLE has contacted property owners in the second phase sampling area through postage mail and have gone door to door in an attempt to schedule a sampling appointment. Phase two sampling will occur during the week of May 12th. 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 email@example.com 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.
Phase two sample results could take 4-6 weeks to return. Once results become available, they will be emailed / 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.
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 the MPART Industrial Pre-treatment Program (IPP). The information gathered from the IPP has also 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.
To receive future updates from EGLE on this investigation, register for the “Cascade Township Residential Wells Sampling and PFAS Analysis” listserv.