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QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW <br /> 4614 W . TURNER RD , LODI <br /> PAGE 2 <br /> In the fail of 1992 , a groundwater treatment system was installed <br /> in one of the monitoring wells A report on the installation of <br /> this system is currently being submitted to San Joaquin Public <br /> Health Services and to Central Valley Regional Water Quality <br /> Control Board. <br /> Groundwater Monitoring and Sampling <br /> Results from earlier quarterly samplings have been submitted in <br /> Previous reports . The five quarterly samplings covered in this <br /> report were conducted by Caltest Analytical Laboratories . The <br /> results of the findings are summarized in the following sections . <br /> Groundwater levels from each quarter are presented in Table 1 . <br /> Analytical results from each quarter are presented in Table 2 . <br /> Analytical results from each monitoring well are presented in <br /> Table 3 Copies of the laboratory reports are presented in <br /> Attachment I <br /> THIRD QUARTER 1992 - Sampled on July 24 , 1992 : <br /> Groundwater levels and samples were obtained from 7 monitoring <br /> wells at the site . Monitoring Wells 4 and 5 have never shown <br /> signs of contamination, and were not tested during this round of <br /> sampling . MW-9 was damaged in 1990 and cannot be sampled. <br /> Groundwater levels varied from 21 61 to 23 , 46 feet below the <br /> surface , historically very low due to the drought . <br /> Laboratory analyses indicate that benzene was present in MW-1 <br /> ( 91 . 0 ug/L) , MW-3 ( 21 0 ug/L ) . TPHg was detected in MW-1 ( 600 <br /> ug/L Trace amounts of toluene and xylene were detected in MW-2 . <br /> MW-1 and MW-3 traditionally show detectable levels of <br /> contaminants MW-2 is traditionally clean, quarterly monitoring <br /> of MW-2 will continue to detect any trend <br /> FOURTH QUARTER 1992 - Sampled on October 23 , 1992 <br /> i <br /> Groundwater levels and samples were obtained from 5 monitoring <br /> wells at the site . MW-1 was converted into an extraction well <br /> for the newly installed groundwater treatment system; information <br /> on MW-1 samples are contained in a separate Groundwater Treatment <br /> Report MW--4 and MW-5 have never show signs of contamination, <br /> and were not tested during this round of sampling . MW-8 , located <br /> in our bottling room, was inaccessible due to bottling <br /> operations . MW-9 is inoperable <br />