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Background

The Ten-Mile Drain Site is located northeast of the City of Detroit and on the western shore of Lake St. Clair, Macomb County, Michigan.  The geographical coordinates of the site are latitude 42°29'12" North and longitude -82°53'56" West.  The site encompasses a several block area where polychlorinated biphenyls (PCBs) have been documented to be present in significant quantities in an underground storm sewer drain system.  The ten-mile storm sewer system is approximately 15 feet underground and empties into two residential canal systems connected to Lake St. Clair.  The area of concern for this site includes sewer lines in and around the intersection of Bon Brea Street and Harper Avenue in St Clair Shores, Michigan, and other areas to be determined for further investigation and sampling.

Over the past nine years, Michigan Department of Natural Resources and the Environment (DNRE), Macomb County Public Works Office (MCPWO), City of St. Clair Shores, Macomb County Health Department, and U.S. EPA’s Removal Response staff have done extensive cleanup, responded to residents’ concerns and conducted investigations at the site,  but a source has not been found consequently the drains and canals have been re-contaminated. U.S. EPA’s work at the Ten-Mile Drain Site has moved from the removal branch to the remedial branch of EPA Superfund.  Agency remedial staff work on long-term cleanup projects. The emphasis will be on finding the source(s) of PCB contamination found in the underground storm sewer drain system. Once the source(s) have been identified, the next step will be to conduct a comprehensive investigation to determine the nature and extent of the PCB contamination and evaluate any potential risks to human health and the environment.  The results of this study and all previous studies will be used to design the most effective approach to clean up the source (s) and stop the potential for re-contamination. 

In September, the Ten-Mile Drain site was placed on the National Priorities List. The NPL is a roster of the nation’s hazardous waste sites eligible for investigation and cleanup under EPA’s Superfund program.

The transfer of the site to EPA’s remedial branch will allow for additional funding and resources.


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