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PUBLIC HEALTH SERVES t,,N <br /> Aa <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 9520 .-0388 04r;Foa`� <br /> 2091468-3420 <br /> (C(Oplf <br /> RANDALL K STEPHENSON <br /> ULTRAMAR INC MAILED JUN 2 0 1996 <br /> 525 THIRD ST PO BOX 466 <br /> HANFORD CA 93230 <br /> RE. Beacon Stations #419, #474, & #641 <br /> Stockton, CA <br /> In order to better evaluate underground tank sites undergoing investigation from an <br /> unauthorized release, San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS-EHD) will require groundwater samples from now on to be <br /> additionally analyzed for Methyl Tertiary Butyl Ether (MTBE). <br /> The Department of Toxic Substances Control (DTSC), in a memo dated February 13, <br /> 1996, has concluded that MTBE can be measured by GC/PID as a target compound in <br /> methods 8020, 8021, orTPH/BTEX, when a PID is used in combination with a FID. As <br /> part of the project quality control, DTSC has recommended that at least one sample per <br /> site which was positive for MTBE also be confirmed by GC/MS (Method 8260). <br /> Detection limits should not be higher than 5.0 ug/l (ppb). <br /> Any new soil borings (i.e.; CPT's, Hydropunch, Geoprobe, etc.) or well installation for <br /> these sites should include soil sampling for MTBE also and detection limits should not <br /> be higher than 1.0 mg/kg (ppm). <br /> Once consistent and valid data has been reviewed and evaluated by PHS-EHD, the <br /> sampling requirement for MTBE in the groundwater may be modified. <br /> Thank you for your continuing cooperation. Please contact Michael Infurna at (209) <br /> 468-3454 should you have any questions. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Michael Infurna, Senior REHS MargIt Lagorio, R HS <br /> Site Mitigation Unit Lead Senior <br /> MI <br /> A Division of San Joaquin County Health Care Services <br />