Document 6RnX2qM8gp74eRN5ODjrG9nvR

..nr*.reK. R. . Keller - Technology Department - South Second Street (CtlNCl TO June 6, 1971 APPLIED SCIENCES 3IODICR - A 10' ? *10 G ^ * M V, 3 . ? apageorge G n e r s 1 Offices cc V. 3. Richard - GO ' \ R. K. Munch - Res. J. F. Kerber - GO K. F. baber - GO E. P. Vheelcr - GO M. W. Farrar - Res. V. K. Johnson - GO C. W. Roos - Res. 1 T. M. Pa trick - Res * ' E. S. Tucker - Res. 2 V. U. Saeger - Res. 2 This memo vill strve ss a summary of the status of our biodegra dation program. To date, ve have obtained primary biodegradation data for 15 products as shown ir. Table I. Degradation rates range from 0% for ICC in 24 hours to 97% for p-ehleresr.i line. The Aroclcr products are reported for 46 hours since it was necessary experimentally-to use a longer period to obtain more reliable data. Current and future work for sethod development and biodegradation testing for 17 additional products-is summarized in Table 21. S'e are currently expending 2.5 nan total continuous effort and need to increass this to at least 3.0 nan to maintain the schedule given. Assuming ve receive no more biod c gr ad aticn work, and including 10% additional effort for method er.c report write-ups, ve will be busy until May, 1972 . The schedule is based upon our best information about t-r ferities . Recipients of this memo are asked to please notify us if changes should be race. . ' ,' .. dfe Attach. -2 R . Keller * ti it* ?:.f _ DEPOSITION EXHIBIT P^pagporae 67 UU1U17S WATER PCB-00055555 TABLE I. BICDEGRAPATIOIs DATA 6-8-71 I Biode2radation* In 24 Hours In 48 Hours I'*-' ^ '-* ** Aroclor 1254 Aroelor 1242 KCS 1016 Arobronochlor 1232 KCS 1043 Aroclor 1221 15 + 38 26 + 15 33 + 14 54 + 19 ' . '5 6.+ 16 ^ ^7 0 *V1a Seni-Continuous Activated Sludge Test 0(110170 WATER PCB-00055556