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I-Th SEBASTIANI VINEYARDS THE SEBASTIANI RESERVES THE SEBASTIANI ESTATES SEBASTIANI SONOMA WINES RICHARD CUNEO VINTAGE SPARKLING WINES AUGUST SEBASTIANI COUNTRY VARIETALS GRAPPA IN SEBASTIANI AUGUST SEBASTIANI PROPRIETORS WINES EYE OF THE SWAN NATHANSON CREEK VENDANGE OAKBROOK FINE WINES INTERNATIONAL October 29, 1993 Diane Hanson San Joaquin County Public Health Services P.O. Box 2009 Stockton, CA 95201 RE: 4614 W. Turner Rd. , Lodi SITE CODE: 1383 QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW 1992-1993 Dear Diane, The following is a summary of groundwater sampling and analyses at the above referenced facility (Figure 1 ) . This summary will also be forwarded to the Central Valley Regional Water Quality Control Board. This report covers 5 quarterly samplings : Third and fourth quarters of 1992 , and the first , second, and third quarters of 1993 . Pro-iect History ' A 550 gallon underground gasoline tank was removed from the site in November, 1988 . Soil samples collected from the tank pit indicated the presence of petroleum hydrocarbons . Excavation of hydrocarbon bearing soil was initiated to a depth of 18 . 5 feet below grade at which depth groundwater was encountered. Findings of the tank removal and excavation have been presented in previous reports . Following the initial excavation, 15 soil borings were drilled, between May 15 and June 2 , 1989 . Laboratory results of soil analyses determined the presence of petroleum hydrocarbons in concentrations exceeding 100 mg/kg in the area surrounding the tank excavation. After completion, 10 of the borings were converted to groundwater monitoring wells (Figure 2) . Initial sampling of the wells indicated the presence of benzene in concentrations above the DHS Maximum Contaminant Levels (MCL ' s) for drinking water in three of the wells . PO BOX 1290•WOODBRIDGE•CALIFORNIA 95258.209-339-1311•FAX 209-339-1348