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Fourth Quarter 2002 Groundwater Monitoring/Remediation Status Report- i <br /> Moore Petroleum Bulk Planf,5491 F Street,Banta,California •_ <br /> Page 6 <br /> Vapor Analysis Performed: <br /> Analysis Abbreviation Designation USEPA Method No. <br /> Total Petroleum Hydrocarbons Gas-Range - + <br /> as Gasoline TPHg Hydrocarbons $015 Modified <br /> Benzene <br /> Toluene Aromatic <br /> Eth Ibenzene BTEX Volatile 8020 <br /> X lenes (Total) organics <br /> Methyl Tertiary Butyl Ether MTBE Fuel 8260B <br /> Oxygenate <br /> - i <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on groundwater analytical results, concentrations remained consistent this .quarter # <br /> compared with last quarter. The domestic well sampling results for all three sampling events <br /> during the quarter was below detection limits. <br /> Groundwater elevations decreased-an average 0.67 feet this quarter compared with last quarter. <br /> { Groundwater isoconcentration maps for'TPHg and benzene show the petroleum hydrocarbon <br /> plume centered by the dispenser island and is defined, while the >soconcentration maps for TPHd <br /> and MTBE are not defined to the northeast. <br /> Apex recommends continued remediation and groundwater monitoring to confirm laboratory <br /> data and monthly groundwater sampling of the domestic well. The next monitoringevent is <br /> x scheduled for January 2003. <br /> ADDITIONAL ACTIVITES PERFORMED AT SITE <br /> i, rNone 4 <br /> f. 4 <br /> { <br /> . f <br /> r <br />