Document 7Rqd7p2mY2GXg9EOV11pkQDdV

7.-1 AfiV ip ATTACHMENT XIV CJTAtySNCC t ci E . I . d u P on t d e N e m o u r s 5c C om pany IN C O R PO R A T E D . P. O . Box 1217 P a r k e r s b u r g . W . V a . 26101 POLYM ER PRODUCTS DEPARTM ENT AR226-1987 CC: R. J . Burger L . W. Goin A, C . Huston T. L . Schrenk G. H. Stoltz R. N. Taylor P. Thistleton R. J . Z ip fel August 7 , 1981 J . W. RAINES ' Polymer Products Department Wilmington - B-5625 C-8 GROUND-LEVEL CONCENTRATIONS - WASHINGTON WORKS Attached is a report from R. I . Wevodau, Engineering Services D iv isio n , concerning C-8 ground-level concentrations for Washington Works, Concentrations o f C*8 were ca lcu la te d using C-8 emission estim ates based on a capacity production* and meteorological data covering a five-year p eriod .** Annual mean, eight-hour maximum, and 1-hour maximum C-8 concentrations were calculated for 2400 points in a receptor g r id . Concentrations o f C-8 were calcu lated for two cases: Case 1A represents concentration estimates fo r the period before May, 1981, Case 1 represents expected C-8 concentrations a fte r the May, 1981 shutdown (when dryer stack heights were, increased by 15 fe e t) . In suntnary: Case 1A and 1 annual mean C-8 concentrations are well ' below the provisional AEL o f 10 ug/m3. The highest Case 1A annual mean C-8 concentration is only about 5% o f the provisional AEL. Since long-term accumulation o f C-8 in the blood is a major concern, the annual mean concentration is the most important in d ica to r o f p o te n tia l employee exposure. * Actual C-8 emissions w ill be le ss since Teflon production does not always operate at capacity, ** M eterorological data collected in the Parkersburg area between January 1, 1973 and December 31, 1977 There's a world of things we're doing something about EID079710 AJP002340 J. W. RAINES - 2- AUGUST 7 , 1981 A ll Case 1A and 1 eight-hour average C-8 concentrations are below the provisional "The highest Case 1A eight-hour average is about 83$ of the provisional AEL. * Increasing dryer stack heights by 15 fe e t reduced the expected annual mean C-8 concentrations a t the 15 selected receptor points by an average 33%. CU-cjpA- M . Joseph G. Loschiavo Attachment Addressee Only JGl/nsw 0057W AJP002341 EID079711