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a <br /> �. ERI 205513 OSR18 Tosco Service Station 5886Stockton Califorma October 25 2001 <br /> quarterly groundwater monitoring and sampling event The water samples will be submitted to a <br /> California State-certified laboratory for analysts <br /> • Tosco and ERI will continue to conduct a comprehensive review of the data acquired during <br /> previous work The results will be presented to the County in quarterly reports, which describe the <br /> status of the proposed work by the dates established by the County <br /> RECOMMENDATIONS <br /> In addition to the environmental activities to be performed during fourth quarter 2001 <br /> (provided above), ERI recommends reducing the sampling frequency for analysis of oxygenated <br /> compounds using EPA Method 8260 to an annual timetable ERI also recommends discontinuing <br /> laboratory analysis of groundwater samples for TPHd <br /> DOCUMENT DISTRIBUTION <br /> ERI recommends signed copies of this summary report be forwarded to the following <br /> Ms Margaret Lagono <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Mr Warren Hartzell <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routler Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 5 <br />