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FILE NAME: Union Carbide (UC) DATE: 1976 Apr 6 DOC#: UC344 DOCUMENT DESCRIPTION: Memo with Fiber Count Samples f V,;5? Mr, j , r . B aliew , J r , B uilding 70-108A INSTITUTE PLANT Ms. B. J . M itc h e ll Mr. J . G. P e rk in s M r, 3?, W illia m s A p ril 6 S 1976 ii.6.. -- I n d u s t r i a l H ygiene You h av e ask ed t e a t m easu rem en ts b e made o f p e r s o n n e l e x p o s u re to a irb o rn e a sb e sto s fib e r s w h ile w eighing d ish e s a r e being prepared for r e s i due a n a ly s e s . Our re c o rd s show th a t a s im ila r m easurer;an; was made an S p e c i f i c a t i o n s L a b o r a to r y Room 2 0 5 , M arch 1 0 , 1975, and was r e p o r t e d t o oe s l i g h t l y a b o v e t h r e s h o l d l i m i t v a l u e {TLV) . T hree d e te rm in a tio n s have r e c e n tly been made by f ib e r r i l t e r sam p lers worn by em ployees w h ile p re p a rin g sam ple d is h e s A n a l y t i c a l .a b o ra ro ry Roc-m 1 0 8 , The r e s u l t s o f t h e s e s a m p lin g s follow s: count on ir, th e are as D ate 12/22/75 1/12/76 3 /1 /7 6 F.mpLcy&e C. V. L e v e rs D, DeLuca J . 0 , Good lib e r C ount/m l A ir t.9 476 ' 7.7 We o b s e r v e d e a c h o f t h e s e s a m p lin g s to oe s i m i l a r i n te c h n iq u e and a i r b o r n e d u s t was n e t v i s i b l e i n e i t h e r i n s t a n c e , The TLV f o r a s b e s to s d u st exposure is c u rre n tly 5 f ib e r s g re a te r than 5 m icrom eters ir. le n g th p e r cc o r a i r a s a tim e w e ig n te u a v e r a g e (TWA,) and a c e i l i n g v a l u e n e t t o e x c e e d 10 f i b e r s g r e a t e r th a n 5 m ic r o m e te r s i n l e n g t h . As c f J u l y 1 , 2 976 , t h e TLV w i l l be re d u c e d t o 2 f i b e r s a s an 0SHA a l l o w a b l e l i m i t . This job ta sk is only in fre q u e n tly perform ed and i t is u n lik e ly t h a t th e TLV a s TWA w ould e v e r be e x c e e d e d . Our m e a s u re m e n ts , h o w e v er, show -hat t h e c e l l i n g l e v e l c a n oe e x c e s s i v e . We, t h e r e f o r e , recom m end t h a t work involving p re p a ra tio n or sample d ish es w ith a sb e sto s fib e r s be perform ed w ith in an exhaust v e n tila te d hood, HfT ;ls <?/ _ / / v < -1' l/l . T) \ v L x 1-' ' ' - . s ' r& zier UCC 008858 A