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knowledge of the current scientific literature in the field of sludge. He has written a lot of it. He was directly involved in the studies and risk assessment that led to the 503 regulations.
He does not believe there can be any reasonable debate on the safety net provided by the regulations. Those who disagree with him, “have not read enough of the literature,” he said.
His primary purpose on the stand was do rebut the testimony of Dr. Stanford Tackett, a chemist from Indiana, Pa., who has studied the effects of lead contamination, especially on young children.
Dr. Tackett’s position is that sludges contain lead and that it is a mistake to introduce any additional lead into the environment as some minute amounts will be adsorbed by living organisms.
Dr. Chaney’s steadfast belief that sludges are absolutely safe when all the rules are followed was matched by Dr. Gregory K. Evanylo, who is a crop and soil scieritist at VPI in Blacksburg.
Testifying for the plaintiffs on Tuesday afternoon, Dr. Evanylo confidently supported the assumptions embodied in the regulations.
95.9%