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u 1� <br /> ERL 205513.oSR12 Tosco Service Statron 58$ 6.St OMii.Califorrua Arml 26. <br /> were detected In wells MW9S, MW9I, and MW10I following selica gel clean up ranging <br /> . from 50 ppb to 66 ppb, respectively <br /> • MTBE was not detected at or above laboratory method detection limits in groundwater <br /> samples collected from wells MW41), MW5D, MW5S, MW7D, MW7S, MW8S, MW8D, <br /> MW9S through MW9D, MW10S, and MW10D MTBE was detected In the remaining <br /> wells (excluding well MW81) ranging from 3 7 ppb to 41,000 ppb using Environmental <br /> Protection Agency (EPA) Method 8020, (ranging from 4 5 ppb to 42,000 ppb [Including <br /> well MW8I] using EPA Method 8260) <br /> i <br /> • Oxygenated compounds ethanol, tertiary butanol, dl-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 /> SECOND QUARTER 2000 ACTIVITIES <br /> The following activities are proposed to be completed during second quarter 2000 <br /> • Tosco and ERI will submit a well Installation permit application to the County to Install a UST <br /> cavity well Upon approval from the County, ERI and Tosco will Implement the recommendations <br /> to purge groundwater from the UST cavity and transport the water to Tosco's refinery In Rodeo, <br /> California for disposal as described In ERI's December 28, 1999, CAP <br /> • Tosco will continue 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 Routler Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 4 <br />