Document QJRo7z6JX6rjM5L6M4vgd7a1v

I cc: C, L. Bradford D. R. Hansen - 1800 October 11, 1971 Mr. Chester gnvnrnrl1 BOO lncorporated2>-^ P. 0. Box809 Los Alamos, New Mexico 87544 Osar Mr. Sllvemallt This letter confirms the telecons of October 6 that Mr. Moore of Monsanto had with Mr. John Oalbralth concerning your use of Santovao vacuum pump fluid. As indicated on their labels, Santovao 1 and Santovao 2 contain polychlorinated biphenyls (PCBa) of various types. As you are aware, PCBs have Increasingly come under the scrutiny of various governmental agencies and scientific laboratories. In some studies, certain PCBs have been found to be persistent, an environmental contaminant and possibly Injurious to certain forma of bird, aquatlo and animal life. Accordingly, It Is Important that PCBs be kept out of the food chain. We want to remind your firm of the extreme care that must be taken by users of Santovao 1 and Santovac 2 fluids to prevent any entry Into the environment through spills, leakage, use, disposal, vaporization or otherwise. Some specific applications where these fluids should definitely not be used are In vacuum systems Involving food or food-related products, animal feeds, pharma ceutical products, packaging materials involving any of such ltema snd buildings where any of these Items are manufactured or stored. If your vacuum system Involves any of the mentioned applications, or If your system Is such that entry Into the environment can not be prevented, you should replace Santovao 1 and 2 with nonPCB fluids Immediately. Please contaot your pump supplier for his recomsionded replacement product. Uaed Santovao 1 and 2 should be returned to Monsanto Company, W. 0. Krummrlch Plant, Sauget, Illinois 62201, Attentions Supervisor Dept. 246 for proper disposal. This service Is per formed at cost, which la $0.03 per pound. Very truly yours. /pep R. E. Hatton Technical Manager Hydraulics and Lubricants MQNS 94166