Document qdO1MmYLLdZ8MkZBxm7b7NrRG

Monsanto rOM I NAME LOCATION, ,g't BWaft f K Ich1*111011^ `T UBJECT May 3, 1972 PCB LOSS CONTROL REFERENCE : TO : Messrs. Bill Engman Art Leisy COMPANY CONFIDENTIAL cc C. F. Buckley R. M. McCutchan i / \ $//-2 iiz i| - There was no difference in the PCB level at the Waste Treatment Plant in the period when the Aroclor department was not operating 4/23 through 4/30 when compared with period 4/1 - 4/22 when department was operating. Data tabulated below: 3/30 - 4/2 4/3 - 5 4/6 - 9 4/10 - 12 4/13 - 16 4/17 - 19 4/20 - 23 4/24 - 26 4/27 - 30 Influent (Drum) #/day 184 139 141 332 68 149 171 79 253 ' 21 23 19 50 11 27 29 13 27 Effluent (Drum) PPb #/day 54 165 32 70 31 / 88 46 55 113 6 28 4 11 5 16 8 9 17 Data from Flip--flop samplers reflect the same. Conclusions ? 1. Values we normally get as Waste Treatment Plant are plant and sewer system background? 2. Have not been down long enough to have puged the sewer system? 3. Heavy rains during period washed PCB's from ground, structure, increased ground water level into broken sewers, etc., etc.? 4 `Can also reflect that we were not sewering HC1 during period when operating in April? DSW 295973 /tm Ed Stewart Technical Services Department STLCOPCB4065917