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� � . <br /> � Working To Restore Nature <br /> 1 , <br /> SUNMIARY/CLOSURE REPORT <br /> JB Terminal <br /> 6700 Grantline Road <br /> Tracy, CA <br /> �s <br /> INTRODUCTION <br /> CRESNA Industries Inc (RESNA), on behalf of BJJ Trucking, Inc , requests formal closure <br /> review of the soil and groundwater investigation at the above referenced site (Plate 1) <br /> IL <br /> y SITE HISTORY <br /> i The site was the location of two 500 gallon underground fuel storage tanks The tanks and <br /> ancillary buried product lines were removed in September 1987 The tanks had been used to <br /> store leaded and unleaded gasoline fuel Plate 2 depicts the former tank locations relative to <br /> other facility features <br /> I During tank removal field evidence and subsequent laboratory analyses indicated the presence <br /> r of low concentrations of toluene, xylenes, and total petroleum hydrocarbons as gasoline (TPHg) <br /> in the soil within the tank excavation Toluene, xylenes and TPHg were also present in a water <br /> ' sample collected from the tank pit Ethylene dibromide, total lead, and benzene were not <br /> detected above method detection limits in any samples Based upon the constituents and the <br /> levels detected the excavation was backfilled Laboratory results for samples are summarized <br /> Iin Tables 1 and 2 <br /> Five monitoring wells have been installed on the site (MW1, MW2, MW3, MW4, MW5) since <br /> } the site investigation was initiated in March of 1990 During the monitoring and sampling <br /> history petroleum hydrocarbons have consistently been detected in the groundwater collected <br /> I L� from well MW1 which was located next to the former tank location in the down gradient <br /> direction Historical data for monitoring well MW 1 indicate that petroleum hydrocarbon analyte <br /> concentrations have been gradually decreasing in the groundwater except when irrigation of the <br /> fields surrounding the site, which occurred in late summer, caused a rise in the water levels <br /> When the groundwater levels rose into the petroleum hydrocarbon contaminated soils left in <br /> place contaminants were released into the groundwater and higher levels were detected in well <br /> li £ MW 1 during the next monitoring episode Additionally, in the summer and fall of 1992 <br /> REPORTs\cL0suRE PNL 1 <br /> 1 <br />