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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 System (GTS) Monitoring _a_nd <br /> Sampling . <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 in Table 1 . Analytical results <br /> are presented in Table 2 Copies of the laboratory reports are <br /> presented in Attachment I <br /> FIRST QUARTER 1995 - Sampled on March 1 , 1995 . <br /> Groundwater levels were obtained from monitoring wells #1 , #3 , #4 <br /> and #5 Samples were obtained from monitoring wells #1 and #3 at <br /> the site Monitoring Well #1 has been converted into an <br /> extraction well The GTS was turned on for one day to purge MW-1 , <br /> and the sample was taken from an influent sampling port in the <br /> GTS . MW-9 was damaged in 1990 and cannot be sampled The <br /> remaining wells ( 2 , 4 , 5 , 6 , 7 , 8 , and 10)were not scheduled to be <br /> sampled during this round of sampling . The effluent to the GTS <br /> was not sampled <br /> Groundwater levels at the four points average 16 . 41 feet below <br /> the surface . This represents an average rise of 0 63 feet from <br /> the third quarter of 1994, the last time water levels were taken . <br /> Lab analysis shows no contaminants in MW-1 or in MW-3 <br />