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Chevron Products Company Page 5 <br /> Former Chevron Service Station#9-5775,301 West Kettleman Lane,Lolly,California July 15,2002 <br /> CONSTITUENT ESTIMATED MASS REMOVED MASS REMAINING —PERCENTAGE <br /> HYDROCARBON TO DATE(Ibs)— IN SOIL(lbs)- REMOVED <br /> MASS(Ibs) 2Q02T 2Q02 <br /> Gasoline 1,450 4,1036 -2,6536 283 <br /> Hydrocarbons <br /> Benzene 370 85 5 2845 23 <br /> MtBE 67 4438 -3768 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 /> CONSTPFCIENT ESTIMATED MASS REMOVED TO MASS REMAINING IN PERCENTAGE <br /> HYDROCARBON MASS DATE(lbs)— GROUNDWATER REMOVED <br /> (Ibs) -JULY 24,2000 2Q02 (Ibs)2Q02 <br /> Gasoline 55 78 472 14 <br /> Hydrocarbons <br /> Benzene 42 0 2 418 5 <br /> M1BE 137 83 8 532 61 <br /> 4.0 SUMMARY AND CONCLUSIONS <br /> • During the 2Q02, 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 1Chevron195775\Perodtc Momtonng\Quarterly Progress Reports1200212nd Quarter-2002 Progress Report doc <br />