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MITTELHAUSER <br /> i corporation <br /> 7901 Stoneridge Drive, Suite 123 <br /> Pleasanton, California 94588 <br /> Bus (510) 418-2900 <br /> Fax (510) 418-0957 <br /> April 1, 1992 <br /> Mr Keith Bullock ! { � <br /> Unocal Corporation f <br /> 2000 Crow Canyon Place, Suite 400 ldViRUi�lsv r I N �j!"` I <br /> San Ramon, CA 94583 �- <br /> SUBJECT: Quarterly Monitoring Report. First Quarter, 1992 <br /> Unocal Service Station #6348 <br /> 3788 Tracy Boulevard <br /> Tracy, California <br /> Dear Mr Bullock <br /> . On March 13, 1992 Mittelhauser Corporation monitored and <br /> sampled groundwater monitoring wells MW-2, MW-3, and MW-4 at station <br /> #6348 in Tracy, California Earlier sampling events had not detected <br /> contamination in wells MW-1, MW-2, and MW-4, while MW-3 immediately <br /> adjacent to the underground fuel storage tanks contained petroleum <br /> hydrocarbon as gasoline (TPHg) and components benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) <br /> The March 13 sampling event confirmed the findings of sampling <br /> undertaken during the latter half of 1991 No TPHg or BTEX was detected in <br /> MW-2 and MW-4 Hydrocarbons were again detected in MW-3, in <br /> concentrations similar to those encountered previously. (Up-gradient MW-1 <br /> was not sampled ) Well locations are shown on the Site Plan, Figure 1. <br /> BACKGROUND <br /> The business at the site is a Unocal service station which has <br /> been in operation since 1972 and has been scheduled for closure at the end of <br /> March, 1992. <br /> In June, 1990 an underground waste-oil storage tank was <br /> replaced because of suspected leaks The tank was found to have holes The <br /> ® CHICAGO, IL BAKERSFIELD, CA INDIANAPOLIS, IN LAGUNA HILLS, CA <br />