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PUBLIC MEALTH SERACES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 . °qc.....:.N`,.. <br /> FpR <br /> 209/468-3420 <br /> DAVE CAMILLE MAILED FEB 0 61996 <br /> UNOCAL CORPORATION <br /> PO BOX 5155 <br /> SAN RAMON CA 94583 <br /> RE: Unocal Service Station #6981 SITE CODE: 1217-123 <br /> 4707 Pacific Avenue <br /> Stockton CA <br /> Pursuant to your telephone call with PHS/EHD staff on January 30, 1996, PHS/EHD <br /> hereby directs you to perform analysis to determine the presence or absence of methyl <br /> tert butyl ether (MTBE) within the evidenced groundwater contamination plume which <br /> resulted from leaking underground storage tanks operated and owned by Unocal. <br /> MTBE has been used as a fuel oxygenation compound in the petroleum industry since <br /> the late 1970's. The requested analysis should include EPA method 8020 with an <br /> initial confirmation utilizing EPA method 8260. <br /> Groundwater samples from all monitoring wells should undergo MTBE analysis until <br /> sufficient information is available to warrant a reduction in the analytical frequency. <br /> If you have any questions, please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Seni REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM\4707PAC <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Joel Greger, MPDS <br /> cc: Greg Gurss, GeoStrategies <br /> A Division of Sanoa uin Counn•H a <br /> 1 1 e Ith Care Services <br />