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! (y <br /> • ERI 205513 QSR14 Tosco Serve tatlon 5886 St c n. Calif r a <br /> October 27 20D0 <br /> • Oxygenated compounds ethanol, tertiary butyl alcohol (TBA), di-isopropyl ether (DIPS), <br /> ethyl tertiary butyl ether (ETRE), and tertiary amyl methyl ether (TAME) were not <br /> detected at or above laboratory method detection limits in the groundwater monitoring well <br /> samples However, the laboratory detection limits were elevated for the groundwater <br /> sample collected from well MW3 <br /> • Tosco purged approximately 31,000 gallons of groundwater from the UST cavity and well MW3 <br /> during third quarter 2000 The extracted groundwater was transported to the Tosco Refinery in <br /> Rodeo, California for disposal Approximately 46,000 gallons of groundwater have been purged <br /> from the UST cavity well and well MW3 since purging was initiated in June 2000 The third <br /> quarter 2000 groundwater monitoring and sampling data for well MW3 (following groundwater <br /> Purging) indicates that MTBE concentrations decreased approximately 82% and TBA <br /> concentrations decreased approximately 85% since second quarter 2000 <br /> FOURTH QUARTER 2000 ACTIVITIES <br /> The following activities are proposed to be completed during fourth quarter 2000 <br /> • Tosco has temporarily suspended groundwater purging activities at the site pending clarification <br /> from the County regarding the sampling and data collection requirements Upon clarification of <br /> these items in writing from the County, Tosco will continue groundwater purging utilizing the UST <br /> cavity well and groundwater monitoring well MW3 as extraction wells The extracted groundwater <br /> will be transported to Tosco's refinery in Rodeo, California for disposal <br /> • Tosco will continue to perform quarterly groundwater monitoring and sampling at the subject site <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 /> ERI recommends signed copies of this summary report be forwarded to the following <br /> Mr Ronald Rowe, Sr <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 /> 4 <br />