One of the "snafus" that GE presented to the cleanup (besides that the historical and prehistoric resources had not been included in the study ironically) back in the 1980s was that according to scientific research some sort of bacteria were eating the PCB until then thought immutable, based on new spectrometry equipment primarily. Turns out it was true however PCB would have a "half-life" so to speak of over 200 years and the argument went on not to disturb the bottom strata. (Also see: (CBS/AP New York) "EPA Must Protect Aquatic Life Near Power Plants")
Source: Hudson River PCB cleanup to start
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