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I QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW QUARTERLY GTS MONITORING AND SAMPLING REVIEW 4614 W . TURNER RD. , LODI PAGE 3 S umm_a r y Trace amounts of TPHg were detected in MW 3 , and trace amounts or Benzene and Toluene were detected in the influent to the GTS . MW 3 early in the monitoring program consistently showed low levels of contaminants , with a downward trend In the four quarterly samplings previous to this report , MW 3 has shown only trace amounts or , more often, non detectible levels of contaminants . The current results of trace levels of TPHg suggest that the plume is retreating The current results also suggest that the rising water table over the last years has not picked up contaminants in the soil . Therefore, the retreat of the plume is not likely to reverse itself MW-1 ( currently the extraction well providing the influent to the GTS) is closest to the site of the former underground tank, and has up to this time consistently shown the highest levels of contaminants . This well has also shown a continuing downward trend in contaminants , especially since the installation of the GTS The current trace level of Benzene and Toluene , and no detection of other contaminants , is a very good sign, consistent with the results of the last quarter of 1994 , when no contaminants were detected We will need further quarterly testing to confirm that the low to non-detect level of contaminants is a long term condition. Effluent from the GTS continues to show no traces of contaminants . The next quarterly sampling will occur in May, 1994 At that time, an abbreviated round of sampling will be done to include MW 3 , MW 6 , MW 7 , GTS influent and effluent . I can be reached at ( 209) 339-1311 with any questions or comments you may have related to this project Yours truly, ASTIANI VINEYARDS i 3 ephen Manildi Attachments cc : California Regional Water Quality Control Board