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' Quarterly Monitoring Report July 12, 1996 <br /> Chapin Brothers Automobile Repair facility Stockton, California <br /> All of the volatile constituents were detected at very low concentrations in MW2 located north of <br /> rthe site During the previous sampling event in March, 1996, only xylenes were detected at a <br /> trace concentration in MW2 This recent occurrence of petroleum hydrocarbons in MW2 may <br /> suggest that the contaminant plume is beginning to migrate offsite to the north, or that the <br /> groundwater level rise to highest recorded elevations to date resulted in increased contaminant <br /> concentrations Gasoline was detected in MW3 and MW5, located on properties west of the site, <br /> at concentrations of 3 1 and 0 56 respectively with low concentrations of the volatile <br /> 1 constituents <br /> Currently, permitting, design, and construction of a remediation system utilizing vapor <br /> extraction/air sparging is in progress In the interim, we recommend continued quarterly <br /> monitoring of the groundwater as required by San Joaquin County Environmental Health <br /> Department and Central Valley Regional Water Quality Control Board guidelines <br /> I � <br /> r <br /> 530-001 - 5 - <br /> LUSH Gi=OSCI>rNCES <br />