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4 <br /> June 22 , 1992 <br /> JUN 2 4 1992 <br /> Diane Hinson M�MAL H <br /> San Joaquin County Public Health Services PERE�VI/I�70NMENALHE IH <br /> P.O. Sox 2009 <br /> Stockton, CA 95201 <br /> RE; 4614 W . Turner Rd. , Lodi _ .. <br /> 'A <br /> QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW <br /> 1991.-1992 <br /> Dear ..Diane, k <br /> The following is a summary of groundwater sampling and analyses at <br /> the above reference facility (Figure 1) . This summary will also be <br /> forwarded to the Central Valley Regional. Water Quality Control <br /> Board, in care of Beth Thayer , for her review, <br /> f This report covers 5 quarterly samplings : 4/11f91 , 7/19/91 , <br /> 10/25/91 , 1/24/92 , and 5/1/92 . <br /> r <br /> Project History <br /> A 550 gallon underground gasoline tank was removed from the site in F <br /> November, 1988 . Soil samples collected from the tank pit indicated ` <br /> the presence of petroleum hydrocarbons . Excavation of hydrocarbon <br /> bearing soil was initiated to a depth of 18 . 5 feet below grade .at <br /> which depth groundwater was encountered . Findings of the tank <br /> removal and excavation have been presented in previous reports . <br /> f Following the initial excavation , 15 soil borings were;drilled by <br /> McLaren between May 15 and June 2 , 1989 . Laboratory ,.results of <br /> soil analyses determined the presence of petroleum hydrocarbons in <br /> concentrations exceeding 100 mg/kg in the area surrounding the tank <br /> excavation. After completion, l0 of the borings were converted to <br /> groundwater monitoring wells. (Figure 2 ) . Initial sampling of the <br /> ` wells indicated the presence of benzene in concentrations above the <br /> DHS Maximum Contaminant Levels (MCL ' s) for drinking water in three <br /> of the wells . <br /> Groundwater Monitoring and Sam lin <br /> RESNA Industries ( formerly WaterWork.) conducted the groundwater <br /> samplings at the facility on the 4/11/91 , 7/19/91 , 10/25/91 , and <br /> 1/24/92 . CalTest Analytical Labs conducted the groundwater <br /> samplings on 5/1/92 . The results of our findings are summarized in <br /> �, the following sections . Hard copy of the laboratory reports are <br /> E :r 4 presented in Attachment 1 . � <br /> 4/11/91 - <br /> Groundwater <br /> /11/91 .Groundwater levels were obtained :from 8 monitoring wells at the <br /> site. Monitoring wells MW-2 -;and MW-9 were -unable to be monitored. <br /> x SITE PLAN WITH MONITORING WELL LOCATIONS n <br /> SEBASTIANI VINEYARDS/WOODBRIDGE CELLARS C <br /> 4614 WEST TURNER ROAD m <br /> e a LODI, CA N <br />