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QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW • 4614 W TURNER RD . , LODI PAGE 4 Laboratory analyses indicate trace amounts of xylene in MW-3 and MW-8 However , the laboratory commented that the readings are considered to be suspect since the analyte was detected in the instrument blank In addition, analyses indicated 200 ug/L TPH as weathered gasoline in MW-3 Summary - Five quarters of groundwater monitoring and sampling at the Sebastiani Vineyards site is detailed in the above text . MW-1 is the well closest to the site of the former underground tank, and has always shown the highest levels of contaminants . It was converted into an extraction well in October, 1992 , as part of a groundwater treatment program MW-3 continues to show intermittent reading of contaminants , including benzene ( 7/24/92 ) , TPHg ( 5/7/93 ) , and TPH as weathered gasoline ( 8/17/ 93 ) • The data suggests the contaminant plume has stabilized in the area monitored by MW-1 and MW-3 Although trace amounts of contaminants have been detected in other wells , these have been isolated incidents followed by clean testing There has been no indication of the plume spreading or migrating Water levels have risen the last two quarters to levels above those of 1988 , when the tank was removed. Future quarterly testing will be sensitive to the possibility of contaminants previously suspended in the soil now reaching the water . So far, the only indication of such a trend is the 200 ug/L reading of TPH as weathered gasoline in MW-3 during the most recent quarter. The next quarterly sampling will occur in November, 1993 At that time, a complete round of sampling ( 8 wells ) will be done . I can be reached at ( 209) 339-1311 with any questions or comments you may have related to this proaect Yours truly, SEBASTIANI VINEYARDS �4- 5 ephen Manildi . Attachments cc California Regional Water Quality Control Board