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Chevron Products Company <br />Former Chevron Service Station #9-5775, 301 West Kettleman bane, Lodi, California <br />Page 5 <br />July 15, 2002 <br />CONSTI-TUENF <br />EST1M TED <br />MASS RtmovED <br />MASS REMAINING <br />PERCENTAGE <br />HYDROCARBON <br />TO DATE'(163) -, - <br />IN:SOIL (1bS)= <br />R_ EMdvED- :' <br />(16s)_ JULY=4, 2�DOU 202 �Ibs). 2Q02 <br />l ssus> <br />�QazT <br />2QO2 <br />7.8 <br />Gasoline <br />1,450 <br />4,103.6 <br />-2,653.6 <br />283 <br />Hydrocarbons <br />Benzene <br />42 <br />0.2 <br />Benzene <br />370 <br />85.5 <br />284.5 <br />23 <br />MtBE <br />67 <br />443.8 <br />-376.8 <br />662 <br />The difference between the estimated hydrocarbon mass and amount removed could be <br />attributable to isolated areas within the assessment area that contain higher contaminant <br />concentrations than previously identified. <br />3.3.2 Estimated Mass of Hydrocarbons Dissolved in Groundwater <br />The results presented below are based on the calculation presented within the PAR/FRP <br />Addendum and cumulative 2Q02 GWE mass removal data. To conservatively estimate <br />analyte mass remaining, historical groundwater analytical data was used. This information is <br />summarized in the following table: <br />CONSTITUENT <br />ESTmIATEI)' <br />MASS `REmov WIT <br />MASS REMAINING IN <br />t <br />PEIiGENTAGE,; <br />AY-DR0CAR6;01v MASS ;DATI (lbs)" <br />ATER <br />aRErii®VEb <br />(16s)_ JULY=4, 2�DOU 202 �Ibs). 2Q02 <br />Gasoline <br />55 <br />7.8 <br />47.2 <br />14 <br />Hydrocarbons <br />Benzene <br />42 <br />0.2 <br />41.8 <br />.5 <br />MtBE <br />137 <br />83.8 <br />53.2 <br />61 <br />4.0 SUMMARY AND CONCLUSIONS <br />• During the 2QO2, groundwater near the site appears to flow radially toward <br />extraction well EX -3; <br />• Concentrations of hydrocarbons off-site are below both primary and secondary <br />maximum contaminant levels (MCLS); and, <br />IAChevron1957751Periodic Monitoring\Quarterly Progress Reports1200212nd Quarter -2002 Progress Report,doe <br />