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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 Estimated Mass Removed Mass Remaining in Percentage <br /> ' Hydrocarbon Mass To Date (lbs)- Groundwater(lbs)- Removed <br /> (lbs)-July 24, 2000 3Q03 310103 <br /> TP—Hg---7 55 92 458 1673 <br /> ' Benzene 42 0 2 41 8 048 <br /> MtBE 137 84 8 <br /> 522 61 9 <br /> 332 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 Estimated Mass Removed Mass Remaining Percentage <br /> Hydrocarbon Mass To Date (lbs)- in Soil (lbs)-3Q03 Removed <br /> (Ibs) 3Q03 <br /> TPHq 1,450 4,132 -2,682 285 <br /> Benzene 370 859 2841 -232 <br /> MtBE 67 4438 -3768 6624 <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 /> 1 <br /> f%Chevron1957751Penodic Monitoring\Q P R1200313rd Quarter 2003 QPR doc <br />