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• QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW <br /> QUARTERLY GTS MONITORING AND SAMPLING REVIEW <br /> 4614 W. TURNER RD . , LODI <br /> PAGE 2 <br /> Following the initial excavation, 15 soil borings were drilled, <br /> between May 15 and June 2 , 1989 . Laboratory results of soil <br /> analyses determined the presence of petroleum hydrocarbons in <br /> concentrations exceeding 100 mg/kg in the area surrounding the <br /> tank excavation. After completion, 10 of the borings were <br /> converted to groundwater monitoring wells (Figure 2 ) . Initial <br /> sampling of the wells indicated the presence of benzene in <br /> concentrations above the DHS Maximum Contaminant Levels (MCL ' s) <br /> for drinking water in three of the wells . <br /> In the fall of 1992 , a groundwater treatment system was installed <br /> in MW 1 . A report on the installation of this system has been <br /> submitted to San Joaquin Public Health Services and to Central <br /> Valley Regional Water Quality Control Board. <br /> Groundwater and Groundwater Treatment S stem GTS Monitoring and <br /> Samplinq <br /> Results from earlier quarterly samplings have been submitted in <br /> previous reports . The quarterly sampling covered in this report <br /> . was conducted by Caltest Analytical Laboratories The results of <br /> the findings are summarized in the following sections . <br /> Groundwater levels are presented an Table 1 Analytical results <br /> are presented in Table 2 Copies of the laboratory reports are <br /> presented in Attachment I <br /> FOURTH QUARTER 1993 - Sampled on November 5 , 1993 . <br /> Groundwater levels and samples were obtained from 8 monitoring <br /> wells at the site. Monitoring Well 1 has been converted into an <br /> extraction well . MW-9 was damaged in 1990 and cannot be sampled. <br /> Groundwater levels varied from 12 . 65 to 14 . 53 feet below the <br /> surface . These levels represent an average rise of 1 . 54 feet <br /> from the third quarter of 1993 . <br /> Laboratory analyses indicate no contaminants in any of the <br /> monitoring wells . Nor were any contaminants detected in the <br /> influent to the GTS ( formerly MW 1) . No contaminants were <br /> detected in the effluent from the GTS <br /> Summary- <br /> MW 2 , 4, 5 , 6 , 7 , 8 , have a history of either no contaminants or <br /> trace amounts appearing at infrequent intervals Consequently, <br />. no contaminant detection in these wells was not unusual <br />