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Monsanto Uonimli Camotny ' 100 N. Imtktrgn 8oul*t4 St. (.suit. Uitioun S3IS3 Hea: OI4J 694.1000 August 14, 1975 01 Dr. J.G. Calandra Industrial BIO-TEST Laboratories l8lO Frontage Road Northbrook, 111. 60062 re; AROCLOR 2-year Rat Feeding Studies Dear Joe: With respect to your letter of August 4, 1975, we appear to be reading from different scripts. * The attached copies of pages from the revised AROCLOR 1254 report (I*T No. 641-06672), dated March 24, 1975 shows that virtually all animal numbers have 3-digits. The exceptions include a 4-digit number on page 10, a series of 2-digit numbers ranging from 71-70 on page 11. and slides marked Ext or Ex appearing on pages 1? and 14. Copies of pages 83-88 from the original report, I3T No. B7298 dated Novemh . 12, 1971 also are attached. These contain the tables listing tumors, and they are the only ones in which individual animal numbers appear. As summarized below, there is a repetition of low digit numbers in each group. Male rat nos. Female rat nos. Control ---------'----- ShOCLOR 1254 1 00m 10 onm ICO pom 1,2 46-43,50, 52,59,64, o9 1,2 3-13 1,2 3-11 4,5,7 1-3,6, 8-15 The only pages which contain similar numbers arc page 11 of the revised report and page 83 of the original report. How - WATER PCB-SD0000036097 Dr. J.C. Calandra August 14, 1975 Page - a - 02 ever, even In those Instances where the same numbers appear, there are inconsistencies > shown below: animal no. 46 47 48 50 52 II 66 frouo . 1 ppm Female 1 ppm Female 1 ppm Female 1 ppm Female 10 ppm Male 10 ppm Female 100 ppm Male 100 ppm Female d sex page 83 all shown as control females Although it Is of minimi significance, pages 84 and 85 of the original report are misnumbered in that page 84 Is a continuation of the table hich begins on page 85. The page for the AR0CL0R 125^ containing the phrase "does not appear to be carcinogenic" has been received. We note the interchange of the numbers 1242 and 1260 on those 2 AR0CL0R reports, and will destroy the mislabeled copies. ` Sincerely, /bkp att. -- George J. Levinskas, PhD kgr., Environmental Assessment and Toxicology . ' , r14094 WATER PCB-SD0000036098