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First Quarter 2003 Groundwater Monitoring/Remediation Status Report <br /> Moore Petroleum Sulk Plant,5491 F Street,Banta,California <br /> i <br /> Page 6 _ <br /> Vapor-Analysis Performed: <br /> Analysis Abbreviation Designation USEPA Method No. <br /> Total Petroleum Hydrocarbons Gas-Range . <br /> TPHg 8015 Modified , I <br /> as Gasoline Hydrocarbons <br /> Benzene <br /> Toluene Aromatic <br /> Eth (benzene BTEX Volatile 8020 <br /> Xylenes Tota! Organics <br /> ISI' <br /> (Total). <br /> Methyl Tertiary Butyl Ether MTBE . Fuel 8260E <br /> Oxygenate . <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based' on groundwater analytical results, concentrations remained 'consistent thi's 'quarter <br /> compared with last quarter. The domestic well sampling results for all three Sampling events . <br /> during the quarter were below detection limits. <br /> i <br /> Groundwater elevations decreased an average 0.85 feet this quarter compared with last quarter. M <br /> Groundwater isoconcentration maps for TPHg and benzene show the petroleum hydrocarbon I <br /> plume centered by the dispenser island and are defined, while the isoconcentration maps for <br /> TPHd and MTBE are not defined to the northeast. i <br /> 'Apex recommends continued remediation and groundwater monitoring to confirm laboratory <br /> K data and monthly groundwater sampling of the domestic well: The next monitoring event was <br /> conducted in April 2003. 1 <br /> f <br /> ADDITIONAL ACTIVITES PERFORMED AT SITE <br /> None <br /> t. . <br /> 1 <br /> l <br /> /SSS <br />