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Off-Site Stream Investigation Summary

  • Initial screening of floodplain soil, surface water, sediment, and fish/crayfish was completed in October 2001.

    • Results of the October 2001 investigation indicated a general occurrence of PCBs in surface water, stream sediments, fish/crayfish, and flood plain soils along Bailey’s Branch and Pleasant Run to the east of the Plant.

    • PCB levels generally decrease with distance from the plant and the stream.

  • 2.0 parts per million (ppm) for total PCBs was used as a screening level for floodplain soils.

  • 2001 Stream Investigation Data Summary was distributed to U.S. EPA, IDEM, and USFWS on March 19, 2002.

  • Additional floodplain soil sampling was initiated by GM in January 2002 based upon the results of the October 2001 sampling activities.

    • Sample collection, sample analysis, data validation/ completion, and distribution to property owners is ongoing.

    • Results of 2002 stream investigation provide an understanding of the extent of the occurrence of PCBs in flood plain soils.

  • Additional sampling has included:

    • Agricultural fields soil, corn, soil in vegetable gardens, cattle, and water from springs and seeps.

  • High flow water sampling was conducted in May 2002.

  • Summary Report of 2002 sampling was submitted to U.S. EPA and IDEM on February 11, 2003 and is available in the document repository of this website. 

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