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E-M:/ Dow Chemical's recent dioxin sampling

DOW's Secret Data Collection Revealing

As the result of a formal informational request filed by DEQ/EPA, Dow Chemical turned over the results of their behind the scenes testing to the DEQ which  promptly placed it on the DEQ web site.  Gary Henry, TRW,  did a great job of breaking down the information on the Tittabawassee floodplain sampling.  A summary of Dow's sampling on the floodplain below the Dow plant site are as follows:

  • 100% of the 16 samples taken from the Tittabawassee River Floodplain down stream of the Dow plant exceeded the state standard of 90 ppt
  • 75 % of the 16 samples taken exceed the ATSDR 1000 ppt action level.
  • 8,920 ppt found near Freeland Festival Park is to date the highest levels found in this floodplain. It is about twenty miles upriver from the 7,280 ppt found at the confluence with the Saginaw River.
  • 3,867 ppt at Tittabawassee Twp Park
  • Four samples taken at Imerman Park ranged from 2,157 ppt to 4,230 ppt.


These results are  consistent with Round 1 Round 2 Round 3 of sampling done by DEQ over the past three years. The conclusion has not changed. Dioxin is pervasive at high levels the entire length of the river.  Dioxin will continue to move and be redistributed along this dynamic mobile river system. As it moves it will continue to be deposited and re-deposited in peoples' yards, homes, public parks and communities. Dioxin will continue to find its way into wildlife, fish and peoples' bodies. It will continue to migrate to the Saginaw River and to Lake Huron.


Michelle Hurd Riddick

Lone Tree Council