Document om4yNR8earMoLopwG53vLy5MR

AR226-2141 Z~*7 AV mm ATTACHMENT XIV tS7*iUA*>K C 2 . du Po n t de N e m o u r s S. C o m pany in Co r p o r a t c d P. O . B o x 1217 P a r k e r s b u r g , W . V a . 26101 POLYMER PRODUCTS DEPARTMENT CC: R. J . Burger L . W. Goin A. C . Huston T. L- Schrenk G. H. Stotz R. N. Taylor P. Thistleton R. J . Z ip fe l August 7 , 1981 J . W. RAINES Polymer Products Department Wilmington - B-5625 C-8 GROUND-LEVEL CONCENTRATIONS - WASHINGTON WORKS A ttached is a report from R. I . Wevodau, Engineering Services D iv is io n , concerning C-8 ground-level concentrations for Washington Works. Concentrations o f C-8 were c a lc u la te d u sin g C-8 emission e stim a tes based on a cap acity production* and m eteorological data covering a fiv e -y ea r p e r io d .** Annual mean, eigh t-h o u r maximum, and 1-hour maximum C-8 co n cen tratio n s were c a lc u la te d fo r 2400 p o in ts in a receptor g r id . C o n cen tratio n s o f C-8 were c a lc u la te d for two cases: t Case 1A represents concentration estim ates fo r the period before May, 1981. Case 1 represents expected C-8 concentrations a ft e r the May, 1981 shutdown (when dryer stack h e ig h ts were increased by 15 f e e t ) . In summary: Case 1A and 1 annual mean C-8 co n cen tratio n s are w ell belo w the pro visio nal AEL o f 10 ug/m . The h ig h e s t Case 1A annual mean C-8 concentration is only about ^ 5% o f the p ro v isio n al. AEL. Since long-term accum ulation o f C-8 in the blood is a major concern, the annual mean concentration is the most important in d ic a to r o f p o te n tia l employee exposure. * Actual C-8 em issions w ill be le s s since Teflon production does not always operate at cap acity. ** M etero rolo gical data c o lle c te d in the Parkersburg area between January 1 , 1973 and December 31, 1977 There's a world of things we're doing something about EID07 9710 AJP002340 ) 0 . W. RAINES 2- - AUGUST 7 , 1981 a n r a <;p 1A and 1 eigh t-hou r average C-8 con cen tration s are ^ o w T h e ^ s U a ? AEL. The h igh est Case 1A e ig h t-h o u r average is about 83% o f the p ro visio n al AEL. In cre a sin g dryer stack heights by ^ f e e t r e d u r e d th e expected annual mean C-8 concentrations a t the lb eoior+ori rpeeDtor p oints by an average 33%. Attachment Addressee Only JGL/nsw 0057M ; Joseph G. Loschiavo AJP002341 EID07 9711