Document YD8KaR3LjOBm8wgnXV1nBkyo8

To: W. C. Becker J. J. Bell W. E. Brodlne D. A. Brooks A. W. Clements C. B. Cooper B. A. DiLiddo C. R. Flynn M. N. Johnson E. B. Katzenmeyer F. E. Krause R. M. Kreager R. A. Krueger P. H. Lawrence J. W. Miller T. B. Nantz J. L. Nelson G. Pow R. N. Rylands G. D. Schaaf R. D. Scott R. W. Strassburg A, Vittone H. Waltemate D. J. Wells A. R. Webber W. J. Wilcox C. L. Woods B. M. G. Zwicker March 14, 1974 Attached are plots of the average of all OVA readings in our PVC plants plus the percentage of the readings over 50 ppm. Caution should be used in observing the January and early February readings at Henry, since during this period the OVA readings were concentrated in the immediate vicinity of leaks. They represent much higher values than would have been recorded had they been measuring the work atmosphere that the employees were breathing. EWH/kats Enclosures E. W. Harrington 22966001 BFG23373 T T*T AVG PPM VCL 1 hi BUILDING 3-12-74 AVERAGE PPM VINYL CHLORIDE CONCENT RAT ION so 4 --- :PEDRICKTDWN-- ! : sc CHEMICAL 'CD. 30 y 30 ----^t------ r. 10 1C ---i-------- i---> _. a FB is zi.z xi mz - WEEK ENDING .JAiN WTT WEEK ENDING BFG23374 22966002 % VCL READINGS EXCEEDING SO PPM 3--7BFG23375 0 0 9 9 6 ZZ