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i <br /> QUARTERLY REPORT <br /> for IRE <br /> Former Mobil Bulk Plant 04-343 E E <br /> 500 East Grantline Road ®EC 0 g 1992 <br /> Tracy, California ENV1RONMEN1-AL11EA1.TM <br /> November 22, 1992 <br /> PERMIT/SERVICES <br /> INTRODUCTION <br /> This report presents the results of October 1992 ground water monitoring and sampling <br /> performed by Alton Geoscience, and the interim remediation status at former Mobil Bulk <br /> Plant 04-343, 500 East Grantline Road, Tracy, California. The site is presently a fenced, <br /> vacant lot. Adjacent properties are either vacant or commercial and industrial <br /> developments. A site vicinity map is presented in Figure 1. A site map showing the former <br /> site configuration is presented in Figure 2. <br /> In August 1988, Mobil Oil Corporation abandoned the former bulk plant. All structures <br /> were removed from the property including one underground gasoline storage tank and four <br /> aboveground diesel storage tanks. Following removal of the UST, analyses of soil and <br /> ground water samples detected the presence of total petroleum hydrocarbons (TPH) and <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX). <br /> In April 1990, Alton Geoscience drilled 48 exploratory soil borings in a grid pattern to <br /> characterize hydrocarbon concentrations in situ. In July and August 1990, approximately <br /> 6,100 cubic yards of soil was excavated to a depth of approximately 10 feet below grade <br /> (fbg). To the greatest possible extent, hydrocarbon-affected soil was removed and properly <br /> disposed of at the appropriate Class II and III facilities. <br /> From September 1990 through April 1992,Alton Geoscience installed nine monitoring wells <br /> to evaluate the possible impact of hydrocarbons on ground water, on- and offsite. Ground <br /> water monitoring and sampling began on a regular basis in October 1990. <br /> SUMMARY OF INTERIM REMEDIATION <br /> Manual pump outs for interim remediation of ground water began in March 1992 for AW-3 <br /> and in April 1992 for AW-9. As of October 1992, 2,010 and 2,080 gallons of ground water <br /> has been removed from AW-3 and AW-9. Recovered ground water was properly disposed <br /> of at Liquid Waste Management, Inc., McKittrick, California, by Balch Petroleum, Inc., <br /> Milpitas, California. Interim remediation is conducted in accordance with San Joaquin <br /> County Public Health Services (SJCPHS) guidelines. <br /> ' ' 1 <br />