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4� <br /> ERI 205513 M19 Tosco Service Station 5886, Stockton,Cahfonua January 30,2002 <br /> • • Tosco will continue to perform quarterly groundwater monitoring and sampling at the subject site <br /> The water samples will be submitted to a California state-certified laboratory for analysis <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 first quarter 2002, <br /> (provided above), ERI recommends continuing quarterly depth to water gauging of on-site groundwater <br /> monitoring wells MW1 through MW7S/MW7D and off-site wells MW8I, MW9I, and MW10I and <br /> reducing the water gauging frequency in wells MW8S/MW8D through MWIOS/MWIOD to a semi- <br /> annual schedule (first and third quarters) ERI also recommends reducing the sampling frequency for <br /> on-site wells MW5D/MW5S, MW7D/MW7S, and off-site wells MW8S/MW8I/MW8D through <br /> MWIOS/MW10I/MW10D to a seize-annual schedule (first and third quarters) <br /> DOCUMENT DISTRIBUTION <br /> ERI recommends signed copies of this summary report be forwarded to the following <br /> Ms Margaret Lagorio <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 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 5 <br />