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40- <br /> QUARTERLY <br /> GROUND WATER <br /> MONITORING AND SAMPLING REPORT <br /> for <br /> Mobil Oil Corporation <br /> Former Mobil Oil Bulk Plant 03-343 <br /> 500 East Grantline Road <br /> Tracy, California <br /> March 6, 1992 <br /> INTRODUCTION <br /> This report presents the results of the November 1991 <br /> quarterly ground water monitoring and sampling performed by <br /> Alton Geoscience at former Mobil Oil Bulk Plant 03-343, <br /> 500 East Grantline Road, Tracy, California. The site is <br /> presently a fenced, vacant lot. Adjacent properties are <br /> either vacant or commercial and industrial developments. <br /> A site vicinity map is shown in Figure 1 and a site plan <br /> in Figure 2. <br /> In August 1988, Mobil oil Corporation abandoned the former <br /> bulk storage and distribution plant. All structures were <br /> removed from the property including one underground gasoline <br /> tank and four aboveground diesel fuel storage tanks shown in <br /> Figure 2 . Following removal of the underground gasoline <br /> storage tank, analyses of soil and ground water samples <br /> detected the presence of total petroleum hydrocarbons (TPH) , <br /> and benzene, toluene, ethylbenzene, and total xylenes (BTEX) . <br /> Eight wells were installed between September 26, 1990 and <br /> May 1, 1991, and quarterly monitoring and sampling began on a <br /> regular basis on August 21, 1991. Chronological details are <br /> presented in Appendix A, Project Background. <br /> FIELD PROCEDURES <br /> On November 26, 1991, Alton Geoscience performed quarterly <br /> ground water monitoring and sampling of Monitoring <br /> Wells AW-1 through AW-8 in accordance with the requirements <br /> and procedures of the Regional Water Quality Control Board <br /> (RWQCB) , Central Valley Region, and the San Joaquin County <br /> Environmental Health Division (SJCEHD) . Alton Geoscience <br /> ground water monitoring and sampling protocol is presented in <br /> Appendix B. The ground water sampling field survey forms <br /> presenting field measurements and observations are presented <br /> in Appendix C. <br /> 1 <br />