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,y <br /> ERI 205513 QSR8os ervice Station.Stockton. A April 28. 1999 <br /> • - Laboratory analyses of groundwater samples collected from boring B8 detected total <br /> xylenes(0 57 ppb) and MTBE (4 4 ppb) at 7 feet bgs, MTBE (2 6 ppb) at 17 feet bgs, <br /> and toluene (0 56 ppb), total xylenes (1 6 ppb),and MTBE (1 2 ppb)at 31 feet bgs <br /> Laboratory analyses of groundwater samples collected from boring B9 detected toluene <br /> (0 52 ppb)at 7 feet bgs and methanol(91 ppb)and ethanol (21 ppb) at 30 feet bgs <br /> Laboratory analyses of groundwater samples collected from boring B10 detected <br /> MTBE (3 3 ppb) at 11 feet bgs,MTBE (35 ppb) and TEPHd(58 ppb)at 16 feet bgs, and <br /> MTBE(90 ppb) and TEPHd (490 ppb) at 30 feet bgs <br /> SECOND QUARTER 1999 ACIVITIES <br /> The following activities are proposed to be completed during second quarter 1999 <br /> • ERI will install three clustered wells (three wells per cluster) near the locations of soil borings B8 <br /> through B10 <br /> • At the request of Tosco and in response to a letter from the County which was not dated but was <br /> received by ERI (via facsimile) on March 26, 1999, ERI will submit a Work Plan for evaluation of <br /> groundwater downgradient of the site by the regulatory due date of April 19, 1999) <br /> • ERI will perform an extended vapor extraction test at the site to evaluate the feasibility of removing <br /> . MTBE from the vadose zone beneath the site <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 Mark List <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> . 5 <br />