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Fourth Quarter 2000 Ground Water Monitoring Report <br /> Cleanup and Abatement Order No.5-00-707 <br /> GAI Pro ect No. ]232 <br /> 1.0 INTRODUCTION <br /> ! 5 This document constitutes the Fourth Quarter (October through December) 2 <br /> 000 ground water <br /> monitoring report for the Montgomery Ward, LLC (Wards) site located. at 5400 Pacific Avenue <br /> and the former Unocal Oil Company of California (Unocal) site located at 5606 Pacific <br /> P Avenue, Stockton, California. Environmental Audit, Inc. (EAI) was retained b War <br /> Unocal to complete joint Y ds and <br /> p J ground water monitoring for both sites. <br /> 1.1 Background <br /> 1.1.1 Wards Site <br /> Wards operates an auto service center at 540 Pacific Avenue, Stockton., California (see Figure <br /> F1). Between 1986 and 1988, Wards removed one waste oil UST, four bulk oil USTs, and two <br /> gasoline USTs from the site. Numerous investigations of the Wards site were conducted <br /> remedial system (air sparging coupled with vapor extraction) was installed to addressnthe <br /> F1 <br /> remediation of petroleum hydrocarbons present in soil and ground water beneath the Wards <br /> site. The remedial system was put into full operation in November 1999, and has been in <br /> 1 <br /> operation since then removing approximately 8,00 pounds of hydrocarbons to date. <br /> Ground water monitoring at the Wards site has been conducted since 1993. <br /> Ground water <br /> monitoring activities for the Wards site and the 5606 Pacific Avenue property (see Section <br /> "� 1.1.2), for the most part, were coordinated with the Unocal site by the various consultants <br /> representing the two entities and conducted simultaneously. Table I summarizes the historical <br /> ground water testing results for the Wards site. <br /> 1.1.2 Unocal Site <br /> The property located at 5606 Pacific Avenue contained a gasoline station between <br /> approximately 1955 and 1985 (see Figure 1). In 1985 the station was closed and the USTs <br /> removed. After completing investigations of the site, Unocal in 1988 excavated approximately <br /> F 6,000 cubic yards of soil from the site. The excavated soil was aerated, and based on the <br /> analytical testing results associated with the aerated soil, 5,800 cubic yards of the aerated soil <br /> was reused on-site as fill, and 200 cubic yards transported off-site for disposal. On August 25, <br /> 1989, the California Regional Water Quality Control Board, Central Valley Region (RWQCB) <br /> issued a letter for the Unocal site confirming that the soil contamination at the site has been <br /> adequately cleaned up, but, that the extent of ground water impact has yet to be defined. <br /> Between 1992 and 1999, additional soil andound water ater investigations associated with the <br /> Unocal site were conducted. Table 1 summarizes the historical ground water testing results for . <br /> the Unocal site. <br /> F <br /> r) <br />_Fit;^ <br /> SHMA232R0092 y <br /> 1 <br /> PENVIRONMENTAL AUDIT, INC., <br />