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rr 4■i <br /> ERI 205513 OSR11 Tom Service Staaon 5886,Stockton.CW&orma __ Jarju.Uy 21 2000 <br /> detected in wells MW 1 and MW2 following selica gel clean up at 53 ppb and 61 ppb, <br /> respectively <br /> • MTBE was not detected at or above laboratory method detection limits in groundwater <br /> samples collected from wells MW7D, MW7S, MW8S, MW8I, and MW9S through <br /> MW9D MTBE was detected in the remaining wells ranging from 2 6 ppb to 27,000 ppb <br /> using EPA Method 8020 (4 7 ppb to 32,000 ppb using EPA Method 8260) <br /> • Oxygenated compounds ethanol, tertiary butanol, di-isopropyl ether (DIPS), ethyl tertiary <br /> butyl ether (ETBE), and tertiary amyl methyl ether (TAME) were not detected at or above <br /> laboratory method detection limits in the groundwater monitoring well samples <br /> FIRST QUARTER 2000 ACTIVITIES <br /> The following activities are proposed to be completed during first quarter 2000 <br /> • Tosco will continue to await the regulatory response to ERI's Corrective Action Plan dated <br /> December 28, 1999 <br /> Tosco will continue quarterly groundwater monitoring and sampling at the subject site <br /> • ERI and Tosco 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 /> Mr W Thomas Skok <br /> Assistant General Counsel <br /> Tosco Marketing Company <br /> P O Box 52085 <br /> Phoenix, Arizona 85072-2085 <br /> 0 4 <br />