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Irl r <br /> ERI 205513 QSR16 Tosco Service Station 5886, Stockton, Califorma April 26, 2001 <br /> • Tosco will continue to perform quarterly groundwater monitoring and sampling at the subject site <br /> Groundwater samples will be collected from all wells (MW1 through MWl0S/I/D) during the <br /> quarterly groundwater monitoring and sampling event The water samples will be submitted to a <br /> California-certified laboratory for analysis for total extractable petroleum hydrocarbons as diesel <br /> (TEPHd), TPPHg, benzene, toluene, ethylbenzene and total xylenes (BTEX), MTBE, ethanol, <br /> TBA, DIPE, ETBE, TAME, 1,2-DCA, and EDB <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 /> RECOMMENDATIONS <br /> In addition to the environmental activities to be performed during second quarter 2001 <br /> (provided above), ERI recommends evaluating the laboratory analysis results of groundwater samples <br /> collected from the groundwater monitoring wells during second quarter 2001 ERI also recommends <br /> evaluating whether further laboratory analysis of groundwater samples for total petroleum <br /> hydrocarbons as diesel (TPHd) and oxygenated compounds using EPA Method 8260 is warranted <br /> ERI recommends signed copies of this sunvnary report be forwarded to the following <br /> Ms Dot Lofstrom <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 /> t� 5 <br />