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S E C O R <br />Third Quarter 2003, Quarterly Progress Report <br />October 14, 2003 <br />Page 4 <br />Constituent <br />Estimated <br />Hydrocarbon Mass <br />(lbs)- July 24, 2000 <br />Mass Removed <br />To Date (lbs)- <br />3Q03 <br />Mass Remaining in <br />Groundwater (lbs)- <br />3Q03 <br />Percentage <br />Removed <br />TPHg <br />55 <br />9.2 <br />45.8 <br />16.73 <br />Benzene <br />42 <br />0.2 <br />41.8 <br />0.48 <br />MtBE <br />137 <br />84.8 <br />52.2 <br />61.9 <br />3.3.2 Estimated Mass of Petroleum Hydrocarbons Adsorbed in Soil <br />The results presented below were previously presented within the third quarter 2003 (3Q03) Quarterly <br />Progress Report. <br />Constituent <br />Estimated <br />Hydrocarbon Mass <br />(lbs) <br />Mass Removed <br />To Date (lbs)- <br />3003 <br />Mass Remaining <br />in Soil (lbs)- 3003 <br />Percentage <br />Removed <br />TPHg <br />1,450 <br />4,132 <br />-2,682 <br />285 <br />Benzene 1 <br />370 <br />85.9 <br />284.1 <br />23.2 <br />MtBE 167 <br />443.8 <br />-376.8 <br />662.4 <br />4.0 SUMMARY AND CONCLUSIONS <br />• Groundwater in the A -zone near the site appears to flow radially toward extraction well EX -3; <br />• The groundwater gradient in the B -zone is variable but flows mainly to low areas to the northeast <br />and south; <br />• Concentrations of hydrocarbons offsite are below primary maximum contaminant levels (MCLs); <br />• Vapor extraction mass removal has reached asymptotic levels; <br />• On August 20, 2003, SVE was discontinued; <br />• Concentrations of hydrocarbons dissolved in groundwater continue to decline, and; <br />• GWE operational data indicates a decline in dissolved hydrocarbon mass removal from the <br />subsurface. <br />I:1Ghevron1957751Periodic Monitoring\Q P R1200313rd Quarter -2003 QPR.doc <br />