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ERI 205513 01Rl3 'roses Se,icgSmuon 5886-Stockton.California _ July 20 2{(� <br /> • MTBE was not detected at or above laboratory method detection limits in groundwater <br /> samples collected from wells MW4D, MW513, MW5S, and MW7D/MW7S through <br /> MW10SIMWl0I/MW10D MTBE was detected in the remaining wells ranging from <br /> 5 17 ppb to 101,000 ppb using Environmental Protection Agency (EPA) Method 8020, <br /> (ranging from 5 72 ppb to 122,000 ppb using EPA Method 8250) <br /> • Oxygenated compounds ethanol, tertiary butyl alcohol (TBA), di-isopropyl ether (DIPS), <br /> ethyl tertiary butyl ether (ETBE), and tertiary amyl methyl ether (TAME) were not <br /> detected at or above laboratory method detection Imuts In the groundwater monitoring well <br /> samples with the exception of well MW3 TBA was detected in the groundwater sample <br /> collected from well MW3 at 112,000 ppb <br /> THIRD QUARTER 2000 ACTIVITIES <br /> The following activities are proposed to be completed during third quarter 2000 <br /> • Tosco will continue to perform periodic purging of groundwater utilizing the UST cavity well and <br /> groundwater monitoring well MW3 as extraction wells The extracted groundwater will be <br /> 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 sumimry 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 /> Tosca Marketing Company <br /> P O Box 52085 <br /> Phoenix, Arizona 85072-2085 <br /> • 4 <br />