Document 6bnjwokKMnV9YKY4M84yRw4V1

7 tlE V . 7->C < M S > cttuusMOitofc E. I. DU Pont de N emours & Company IHCOMPOMTEft Wilmington, Delaware 19898 ENGINEERING DEPARTM ENT Ju ly 24, 1981 AR226-1986 CC: A.R. Bebake -PPD -w astaington w k s A.C. H uston -PPD-W ashington Wks p . T h is tleton-PPD -W ashingtoa Wks H .L . B rooks " BSD - E .N . H elm ers ESD . I . C. 13-AQ&HE J . G. LOSCHlAffiO-- -----" . POLYMER PRODUCTS DEPARTMENT WASHINGTON WORKS PPD - WASHINGTON WORKS TEFLON AIR POLLUTION GROUND LEVEL C-8 CONCENTRATIONS l a y o u r A p r il 2 4 , 1981 l e t t e r t o me you r e q u e s te d d e te r m in a tio n o f ^ e ig h t- h o u r tim e w eig h ted C-8 c o n c e n tr a tio n s t h a t r e s u l t from e m is s io n s from t h e TFE B u ild in g (162) and FEP B u ild in g (1 6 3 ). S ubsequent to t h a t l e t t e r we e l e c t e d t o e v a lu a te b o th TMflvtTmtm e ig h t- h o u r and an n u a l mean C-8 c o n c e n tr a tio n s u s in g f i v e y e a r s o f h o u rly m eteo ro lo g y f o r P a rk e rs b u rg . 1 exam ined two c a s e s f o r t h e TFE e m is s io n s . Case 1 i s found i n y o u r A p r il. 24 l e t t e r a s " A fte r May Shutdown and Case 1A i s th e same as Case 1 e x c e p t th e two d ry e r V ent s ta c k s a r e 15 f t lo w er, r e p r e s e n tin g the s itu a tio n befo re the stack s were extended. Superim posed on th e TFE d r y e r v e n ts w ere C-8 e m issio n s .from t h e WES a r e a . B a sic d a ta f o r th e s e two v e n ts (w et f in i s h i n g and c o a g u la to r baghouse v e n ts ) a r e sum m arized i n a l e t t e r t o me from A. R. Behnke d a te d May 2 1 , 1981. I d id n o t in c lu d e th e b le n d e r p i t e x h a u s t b e c a u se C-8 e m issio n i s n e g l i g i b l e compared to th e o th e r s o u r c e s / As you s u g g e s te d , I used 50% o f th e e m is s io n r a t e s i n A. R . Behnke s le tte r fo r th is study. * Stack and em ission d a ta fo r both eig h t-h o u r and annual mean co n cen tratio n s are lis te d in Attachm ent A (fo u r pages). M eteorology d a ta cover th e fiv e -y e a r p eriod from January 1, 1973 to December 31, 1977. S urface d a ta a re f o r P arkersburg and h e ig h ts from D ayton, OH. C o n c e n tra tio n s a r e computed f o r e a c h h o u r and t h e n `av erag ed o v e r e ig h t- h o u r and a n n u a l p e rio d s a t e a c h r e c e p to r (a p o in t i n sp a c e fo r which c o n c e n tra tio n i s computed). A ll eig h t-h o u r tim e w eighted averages fo r th e e n t i r e f i v e - y e a r p e r io d a r e below th e H a s k e ll L a b o ra to ry AEL o f 10 ng/m . Your May 12, 1981 l e t t e r t o me s p e c i f i e d 15 lo c a tio n s f o r w hich e ig h t- h o u r and an n u a l mean c o n c e n tra tio n s w ere to b e com puted. T able 1 i s a summary o f th e h ig h e s t c a lc u l a t e d C-8 c o n c e n tra tio n s f o r each o f th e s e 15 lo c a tio n s o v e r t h e f i v e - y e a r p e rio d o f r e c o r d f o r C ase 1 and Case 1A. To r e i t e r a t e , Case 1 r e p r e s e n ts c u r r e n t s ta c k h e ig h ts and Case 1A r e p r e s e n t s s ta c k h e ig h ts p r i o r t o e x te n s io n o f th e d r y e r v e n t s ta c k s on th e TFE B u ild in g . The h i g h e s t c a lc u la te d e ig h t- h o u r v a lu e i s 6 .9 jig/ra , a t th e B u ta c ite O ffice B uilding (Case 1A). AJPQ02900 EXD079585 J Ju ly 24, 1981 J . G. L oschiavo T able 2 i s a summary o f th e h ig h e st- o n e-hour c o n c e n tr a tio n s f o r each r e c e p to r lo ca tio n fo r each o f th e fiv e y ears- Although th e re I s no e sta b lish e d one-hour lim it fo r C-8, th e one-hour v alu es need to be c a lc u la te d to determ ine e ig h t-h o u r and annual mean c o n c e n tra tio n s. The h ig h e s t e ig h t-h o u r v alu es a re summarized i n T able 3- None o f th e v a lu e s ex ceeds t h e AEL o f 10 Comparison w ith T ab le 1 i n d i c a t e s t h a t maximum e i g h t - h o u r v a lu e s a r e l e s s th a n h a l f th e maximum o n e-h o u r v a l u e s . T h is i s d u e , o f c o u r s e , to the im p ro b a b ility o f id e n tic a l m eteo ro lo g ical c o n d itio n s p e r s is tin g from hour to hour. Annual mean v alu es fo r each of th e fiv e y ears a re summarized in T able 4. There i s no an n u a l mean l i m i t f o r C78 b u t a n n u a l v a lu e s a t a g iv e n l o c a t i o n d e te rm in e lo n g term ex p o su re to C-8 a n d , a s su g g e ste d by P a u l T h i s t l e t o n , may b e u s e f u l i n c o r r e la tin g w ith org an ic flu o rid e blood analyses done on s e le c te d p la n t employees. None o f th e 15 r e c e p to r s (e x c e p t p o s s ib ly No. 15) i s downwind o f th e p r e v a i l i n g (W t o SW) wind d i r e c t i o n . 'F o r t h i s r e a s o n , X have m a d e - a d d itio n a l a n n u a l mean . d eterm in atio n s fo r a re c e p to r g rid of 2400 re c e p to r p o in ts lo c a te d 200 f t a p a r t. -Maximum a n n u a l v a lu e s f o r th e s e ,r u n s a r e summarized i n T a b le 5 . As e x p e c te d , th e maximum v a lu e s ' a r e somewhat h ig h e r th a n th o se d e te rm in e d from t h e 15 r e c e p t o r p la n t netw ork. C oncentration contours fo r 1976, th e y e a r which e x h ib its th e h ig h e s t a n n u a l v a l u e s , a r e drawn on F ig u re s 1 and 2 . The maximum c o n c e n tr a tio n s , as expected, f a l l to th e n o rth e a st o f .the p la n t. - ^ ' The h ig h e s t c a lc u la te d e ig h t-h o u r c o n c e n tra tio n s, f o r Casual and Case 1A, occur a t B u ta c lte O f f ic e B u ild in g o n Ju n e 4 , 1977 from 8 :0 0 4M t o 4 :0 0 FM. X have computed c o n c e n tra tio n c o n to u rs f o r t h i s p e rio d and h av e a tta c h e d them "a s F ig u re s 3 and 4 . These contours re p re s e n t co n cen tratio n s a t a 2400 p o in t re c e p to r g rid w ith th e points 50 f t.a p a r t. M eteorological conditions fo r th e c r i t i c a l eig h t-h o u r period a re li s t e d in Attachm ent B. Please n ote th a t "ground zero" fo r a l l of the co n cen tratio n p io ts is a p o in t h a lf way between th e d ry e r s ta c k s . X have only p lo tte d " w o rst c a se " c o n d itio n s ; o th e r ; periods can be e a s ily p lo tte d i f you so d e sire . ., ENGINEERING SERVICE DIVISION A ir Q uality & Hazards Engineering R. I . Wevodau Senior C onsultant RIW: c p r A ttach. ` AJP002901 X EID 0795S6