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• <br />C7 <br />• <br />Chevron Products Company <br />Former Chevron Service Station #9-5775, 301 West Kettleman Cane, Lodi, California <br />Page 5 <br />April 15, 2002 <br />CONSTITUENT <br />ESTMIATED <br />MASS REMOVED <br />MASS REMAINING <br />PERCENTAGE <br />HYDROCARBON <br />To DATE (lbs) —1" <br />IN SOIL (lbs)-X'r <br />REMOVED <br />MASS (Ibs) <br />QUARTER 2002 <br />QUARTER 2002 <br />„ <br />Gasoline <br />1,450 <br />4,097.9 <br />-2,647.9 <br />283 <br />Hydrocarbons <br />55 <br />7.56 <br />47.43 <br />14 <br />Benzene <br />370 <br />85.4 <br />284.6 <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 V quarter 2001 GWE mass removal data. To conservatively <br />estimate analyte mass remaining, historical groundwater analytical data was used. This <br />information is summarized in the following table: <br />CONSTITUENT <br />ESTIMATED <br />MASS REMOVED TO <br />MASS REMAmNG IN <br />PERCENTAGE <br />HYDROCARBON ]MASS <br />DATE (lbs) —1ff <br />GROUNDWATER <br />REMOVED <br />Obs) - JUL i 24, 2000 <br />QUARTER 2062 <br />(lbs) 0 QUARTER <br />„ <br />Gasoline <br />55 <br />7.56 <br />47.43 <br />14 <br />Hydrocarbons <br />Benzene <br />42 <br />0.305 <br />41.69 <br />.7 <br />MtBE <br />137 <br />82.69 <br />54.31 <br />60 <br />4.0 CONCLUSIONS AND RECOMN ENDATIONS <br />• With the exception of EX -1, concentrations of hydrocarbons both on and off-site <br />continue to decline. <br />Concentrations of hydrocarbons off-site are below both primary and secondary <br />maximum contaminant levels (MCLs). <br />I:1Chevron1957751Periodic MonitoringlQuarterly Progress Reports1200211st Quarter -2002 Progress Report.doc <br />