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r. . _ <br />estlff wds l,**" <br />Nestle Foods Corp., 230 Industrial Avenue, Ripon, CA 95366 (209) 599-4161 <br />November 19, 1990 <br />EVA <br />NOV 2 1 ink <br />Ms. Carol Oz <br />REHS <br />P.O. Box 2009 <br />Stockton, CA 95201 <br />Per your request, below is a brief history of the Nestle/Hills <br />Bros. Coffee Co. facility in Ripon, CA, as well as a summary of <br />our Hazard Wastes. <br />History <br />The facility was purchased in 1929 and originally was utilized <br />for the production and processing of evaporated milk. Later it <br />was converted to manufacturing soluble instant coffee. In 1957 <br />a decaffeination plant utilizing Trichlorethylene (TCE) for <br />extraction purposes was constructed. For technical reasons, <br />Nestle converted to a Methylene Chloride (MC) extraction process <br />in 1970. The MC process was operated until April 1986 when it <br />was shut down. Nestle/Hills Bros. continues to manufacture <br />soluble instant coffee at this location. <br />In 1986 a sampling of Nestle/Hills Bros. wells detected TCE in <br />the groundwater. The company has been working with the State <br />RWQCB on the remedial investigation and activity. <br />Hazardous Wastes <br />Carbon: Spent activated carbon with Trichloroethylene from our <br />groundwater adsorber is the largest quantity item. However, it <br />should be noted that a 30,000 lb. load of spent activated carbon <br />only has about 5 lb. of Trichloroethylne. This material is <br />sent out for thermal reactivation. <br />Spent activated carbon is also used in drums on our soil <br />vacuuming operation. These drums collect either Trichloro- <br />ethylene or Chloroform depending on the location being vacuumed. <br />This material is sent out for thermal reactivation. <br />Both of the operations above resulted from groundwater cleanup <br />efforts stemming from chemicals used in our decaffeination <br />operations. <br />