Document 0JrGvxzXMpLQEeJQaM6pwdLwR

bcc: C. L. Bradford P. L. Slayton October 1, 1971 Dr. William D. Oregory Georgetown University Department of Physics Washington D. C. 20007 Doar Dr. Gregory: This lettor confirms your telecon of October 1 with Mr. Moore concerning your use of Santovao 2 vacuum pump fluid. Aa Indicated on their labels, Santovac 1 and Santovac 2 contain polychlorinated biphenyls (PCBa) of various types. As you are aware, PCBc have increasingly com under the scrutiny of various governmental agencies and scientific laboratories. In some studlea, certain PCBa have been found to be persistent, an environmental contaminant and possibly injurious to certain forms of bird, aquatic 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 Santovac 1 and Santovac 2 fluids to prevent any entry Into the environment through apllls, leakage, use, disposal, vaporization or otherwise. Some specific applications where those fluids should definitely not be used are in vacuum systems Involving food or food-related products, animal feeds, pharmaceutical products, packaging materials Involving any of auch Items and buildings where any of these Items are manu factured or stored. If your vacuum aystem Involves any of the mentioned applications, or if your system la such that entry into the environment can not bo prevented, you should replace Santovac 1 and 2 with nonPCB fluids immediately. Please oontact your pump supplier for his recommended replacement product. Or. Wllllan D. Oregory October 1, 1971 rase Two Used Santovac 1 and 2 should be returned to Monsanto Company, V* 0. Krunmrlch Plant, Sauget, Illinois 62201, Attention: Supervisor Dept. 246 for proper disposal. This service Is per formed at cost, which Is $0.03 per pound. Very truly youra. /pep ft. K. Hatton Technical Manager Hydraulics *> Lubricants HONS 092141