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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 , 1939 . 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 fail 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 and <br /> Samvlina <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 1994 - Sampled on February 1 , 1994 <br /> Groundwater levels and samples were obtained from monitoring well <br /> #3 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 /> The remaining wells were not scheduled to be sampled during this <br /> round of sampling The influent and effluent to the GTS were <br /> also sampled <br /> Groundwater level at MW 3 was 15 20 feet below the surface <br /> These levels represent a drop of 75 feet from the fourth quarter <br /> of 1993 <br /> Laboratory analyses indicate 96 npb Total Petroleum Hydrocarbons <br /> (Gasoline) No other contaminants were detected . <br /> In the Groundwater Treatment System fGTS ) , 7 ppb Benzene and . 8 <br /> ppb Toluene were detected in the influent ( formerly MW 1 ) . No <br /> contaminants were detected in the effluent from the GTS <br />