The Boston chapter of the Sierra Club got this chilling note in the mail two weeks ago, postmarked Manchester, N.H.:
''Why is the Sierra Club sponsoring the false and plain wrong advertisements about the Rep. (John) Sununu? It is the kind of tactics that terrorists use. It is full of lies and distortions... There is nothing I can do to stop the ads but I can punish you people.
''I work in the electric generation industry. I have access to large amounts of PCBs from old transformers. I am going to start dumping five gallon pails of this transformer oil in some of your favorite rivers as soon as the ice breaks up...I have plenty of oil to use. This is your fault. Blame yourself.''
Police agencies in all Northeastern states have been alerted, and federal investigators are taking this threat seriously. Obviously a couple of pails full of PCBs aren't likely to affect the health of a major river, but the demented undertone to this note is as scary as if he or she were talking about cyanide, and a knock on the door from the FBI sounds just about right.
The irony of the letter, though, is that our own Hudson River already has a gun to its head over PCBs, only in reverse. Tons and tons were dumped in the river by General Electric's Fort Edward and Hudson Falls plants back in the bad old days, and now GE is trying every loose trick, confusion and delaying tactic to avoid a major river cleanup.
This week we were treated to another shameless exercise in GE's continual effort in this endeavor. With great hoopla, a ''major'' study was announced by a GE-paid researcher that seems to show no increased cancer death rate for 7000 plus workers at the above named plants compared to the general population.
In its narrow focus, Dr. Renate Kimbrough's study seems to add another valid opinion over whether PCBs are carcinogenic. Why the announcement was shameless is that GE tried to imply much more from Kimbrough's research than the study even begins to claim. It's as if GE sets up its own bull's-eye far off the mark, claims to hit it with this study, then intimates that PCBs are therefore harmless and hardly worth the effort to clean up. Balderdash.
Keeping in mind that no GE workers have been involved with PCBs in 20 years, the study was done primarily by evaluating death certificates. So the statistics are as sound as the few words scribbled down by a physician or medical examiner. This is not a small consideration. In the late 1970s, the state of Massachusetts did a study of GE's PCB-steeped Pittsfield plant and found excess mortality from leukemia and cancer of the large intestine. GE then hired a leading epidemiologist, Dr. David Wegman, who issued his own research on the subject by looking at death certificates, similar to Dr. Kimbrough's methodology.
He published the results in 1990. Most significantly, he took issue with the depth of information available to him. He noted incomplete company records, the difficulty of determining the ''real'' cause of death, the inclusion of only cancers that killed, and limited data on historical workshop exposures.
''There is a high probability, therefore, that even if elevated cancer risks exist in this environment, they might not be found,'' Dr. Wegman concluded.
So, for now all we really need to know here in New York about PCBs and GE is this: neither the DEC, nor state Health Department nor the EPA even blinked when the Kimbrough study came out. A huge body of research condemns PCBs as a health risk, to humans, to fish to birds.
You couldn't eat most of the fish taken out of the Hudson yesterday, and you won't be able to tomorrow -- because of PCBs. That seems remarkably like a river being held hostage to me. Fred LeBrun can be reached at 454-5453.
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