PCB contamination around the canals in St. Clair Shores is more severe and more widespread than previously thought, the Detroit News reports.
Polychlorinated biphenyls (PCBs) are a class of toxic compounds that were used in manufacturing but banned in the U.S. in the 1970s. Exposure to PCBs has been linked to a broad range of health problems including reproductive and immune system damage and cancer.
Over the last seven years federal, state and local officials have spent $10 million on efforts to clean up PCBs in the canals and groundwater in St. Clair Shores.
Samples of underground oil taken from two sites near the Bon Brae/Harper intersection showed PCB readings of 98,000 parts per million and 820,000 parts per million. One part per million is considered safe for human health by state standards.
“The numbers surprised our consultants. They surprised officials at the city of St. Clair Shores and they surprised us,” said William Misterovich, deputy Macomb County public works commissioner.
“The numbers are just astronomical. I believe they are the highest we’ve ever tested out there.”
The source of the PCB contamination has not been identified.
The 10th St. canal in St. Clair Shores was among three sites that Governor Jennifer Granholm asked the U.S. Environmental Protection Agency to include on its National Priorities or Superfund List. Federal funds can be used to clean up contaminated areas that are designated as Superfund sites.