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