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By Noyes W

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The f i r s t s t e p i n any t o x i c w a s t e s t u d y i s t o d e t e r m i n e what t o x i c m a t e r i a l s a r e p r e s e n t and i n what amounts. Since most t o x i c w a s t e s i t u a t i o n s i n v o l v e t h e dumping o f d i v e r s e m a t e r i a l s , p r o b l e m s o f e x p e n s i v e t e c h n i c a l m e t h o d o l o g y c a n be formidable. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1982. Ηουκ Impacts on Human Health 1915 1925 1935 1945 Year 1955 1965 1975 Figure 1.

The s u s p e c t e d s o u r c e o f c o n t a m i n a t i o n was a s t e e l w i r e and r o d m i l l t h a t u s e d t h i s compound as a d e g r e a s i n g agent. I m p r o p e r d i s p o s a l r e s u l t e d i n s p i l l s on p l a n t p r o p e r t y , w h i c h l e a c h e d i n t o n e a r b y l a g o o n s and w e l l w a t e r s u p p l i e s . A t a n o t h e r t u b e company, a p i p e f e e d i n g a l a r g e s t o r a g e t a n k o f TCE r u p t u r e d and s p i l l e d o v e r 2,000 g a l l o n s o f TCE i n t o a s t o r m sewer s u r f a c e and g r o u n d w a t e r A p p a r e n t l y , h u n d r e d s o f p e o p l e were b e i n g e x p o s e d t o TCE through t h e i r d r i n k i n g water.

The f o u r t h d i f f i c u l t y — o n e o f t e n e n c o u n t e r e d — i s t h a t a h e a l t h outcome r o u t i n e l y m e a s u r e d by p o l i t i c a l b o u n d a r i e s ( c a n c e r m o r t a l i t y , f o r i n s t a n c e ) has t o be r e s h a p e d t o e n v i r o n m e n t a l b o u n d a r i e s , s u c h as t h o s e imposed by an a q u i f e r o r w i n d p a t t e r n , to i n c l u d e the p o p u l a t i o n under study. U n l e s s the e x p o s u r e o r outcome b o r d e r s a r e d e f i n e d by p r o p e r l y e x t r a p o l a t i n g o r i n t e r p o l a t i n g them t o c o i n c i d e g e o g r a p h i c a l l y , any cause-and-effeet relationship i s useless.

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