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Third Quarter 2003 Groundwater Monitoring/Remediation Status Report <br /> Moore Petroleum Bulk Plant,5441 F Street,Banta,California <br /> Page 6 <br /> Vapor Analysis Performed: <br /> Analysis Abbreviation Designation FUSEPA Method No. <br /> Total Petroleum Hydrocarbons TPH Gas-Range 8260B <br /> as Gasoline g Hydrocarbons <br /> Benzene Aromatic <br /> Toluene BTEX Volatile 8260E <br /> Eth (benzene <br /> Xylenes (Total) Organics <br /> Methyl Tertiary Butyl Ether MTBE Fuel 8260B <br /> Oxygenate <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Groundwater elevations increased an average 3.25 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 are defined, while the isoconcentration maps for <br /> TPHd and MTBE are not defined to the northeast. <br /> ,. Based on groundwater analytical results, concentrations remained consistent this quarter <br /> compared with last quarter. Hydrocarbon concentrations classified as TPHd and TPH as motor <br /> oil (TPHmo) continue to vacillate between each other due to laboratory interpretation of the <br /> results. The domestic well sampling results for all three sampling events during the quarter were <br /> below detection limits. <br /> It is noted that TPHd concentrations in wells MW-1, MW-3, MW-8, MW-10, VEW-2, and <br /> VEW-3 are not decreasing; some non-volatile TPHd compounds are being classified as TPHmo <br /> in the groundwater samples. These less volatile compounds will not be removf;d by soil vapor <br /> extraction alone. Therefore, Apex has submitted a workplan dated September 26, 2003 that <br /> recommends in-situ chemical oxidation by ozone sparging to remove the TPHd/TPHmo mass <br /> from the soil and groundwater, and reduce groundwater concentration for these compounds. <br /> Apex is currently awaiting a response from the SJCEHD for the workplan. <br /> Apex recommends continued remediation and groundwater monitoring to confirm laboratory <br /> data and monthly groundwater sampling of the domestic well. The next monitoring event is <br /> conducted in November 2003. <br /> ADDITIONAL ACTIVITES PERFORMED AT SITE <br /> None <br />