Document bB3Zgvw1K8XEoZ2J2K5NwJbL6

INDUSTRIES PPG INOUSTRIES, INC./ONE GATEWAY CENTER/PITTSBURGH, PENNSYLVANIA 15222/AREA 412/434-2585 ZEB G. BELL, JR., Sc.D.. Manager Environmental Health and Toxicology Industrial Chemical Division December 30, 1981 Robert J. Fensterheim Administrator Chemical Manufacturers Association 2501 M Street, N.W. Washington, DC 20037 Dear Robert: Reference is made to your correspondence dated December 17, 1981 concerning final payment to Dr. Maltoni for the EDO research. We have made an honest effort to gather more data on a number of points in Dr. Maltoni's EDC program. It is still not clear how the chamber concentrations varied within each day. Were the individual readings averaged each day and then the monthly averages calculated? It would be interesting to see what were the maximum concentration ranges per day, however, I doubt if this is worth the effort. We probably have received as much information from Maltoni as we are likely to get so I recommend we make the final payment. Sincerely, /jh Attachment SL 080593