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• <br />i <br />• <br />Chevron Products Company <br />Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California <br />Page 5 <br />October 31, 2002 <br />CONSTITUENT <br />ESTIMATED <br />MASS REMOVED <br />MASS REMAINING <br />PERCENTAGE <br />HYDROCARBON <br />To DATE (Ibs) — <br />IN SOIL (lbs)- <br />REMOVED <br />MASS (lbs) <br />3Q02r <br />3Q02 <br />Gasoline <br />1,450 <br />4,123.6 <br />-2,673.6 <br />284 <br />Hydrocarbons <br />Benzene <br />370 <br />85.7 <br />284.3 <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 3Q02 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 />ESTIMATED <br />MASS REMOVED TO <br />MASS REMAINING IN <br />PERCENTAGE <br />HYDROCARBON MASS <br />DATE (lbs) — <br />GROUNDw.Atkik <br />REMOVED <br />(lbs)-- JULY -24; 2400 <br />3Q02 <br />(lbs) -3Q02 <br />Gasoline <br />55 <br />8.1 <br />46.9 <br />14 <br />Hydrocarbons <br />Benzene <br />42 <br />0.2 <br />41.8 <br />0.5 <br />MtBE <br />137 <br />84.3 <br />52.7 <br />61 <br />4.0 SUMMARY AND CONCLUSIONS <br />• During the 3Q02, 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 />I:1Chevron1957751Periodic Monitoring\Quarterly Progress Reports1200213rd Quarter -2002 Progress Report.doc <br />