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SECOR <br />First Quarter 2003, Quarterly Progress Report <br />April 15, 2003 <br />Page 4 <br />Constituent <br />Estimated <br />HydrQc�rbon.Mass <br />(Isis). July 24, 2600 <br />Mass Removed <br />To bif'e (lbs)- <br />166 <br />Mass Remaining in <br />Groundwater (lbs)- <br />1003 <br />Percentage <br />Remold <br />TPHq <br />55 <br />87 <br />463 <br />158 <br />Benzene <br />42 <br />0 2 <br />41 8 <br />0 5 <br />MtBE <br />137 <br />84 8 <br />522 <br />618 <br />3 4 2 Estimated Mass of Petroleum Hydrocarbons Adsorbed In Sod <br />The results presented below were previously presented within the fourth quarter 2002 (4Q02) Quarterly <br />Progress Report <br />Constituent <br />Estimated <br />Hydrocarbon Mass <br />(Ibs) <br />Mass Removed <br />To Date (lbs)- <br />1 Q03 <br />Mass Remaining <br />In Soil (lbs) -1003 <br />Percentage <br />Fiemoved <br />TPHq <br />1,450 <br />4,1236 <br />-2,6736 <br />284 <br />Benzene <br />370 <br />857 <br />2843 <br />23 <br />MtBE <br />67 <br />4438 <br />-3768 <br />662 <br />4.0 SUMMARY AND CONCLUSIONS <br />• Groundwater near the site appears to flow radially toward extraction well EX -3, <br />• Concentrations of hydrocarbons offsite are below primary maximum contaminant levels (MCLs), <br />Influent vapor extraction concentrations are below laboratory method detection limits, <br />Vapor extraction mass removal has reached asymptotic levels, <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 />5 0 RECOMMENDATIONS <br />Based on the data presented above, SECOR recommends the following <br />5 1 Groundwater Monitoring and Sampling <br />Based on historical groundwater monitoring and sampling results, SECOR recommends that monitoring <br />wells MW -2, MW -11A, MW -11 B, MW -12A, MW -12B, MW -13, MW -20A, and MW -20B be sampled on a <br />semi-annual basis and gauged quarterly SECOR recommends quarterly groundwater monitoring and <br />sampling on the remaining wells Additionally SECOR recommends the removal of MW -5A from the <br />11Chevron1957751Penodie MonitoringQuarterly Progress Reports1200311 st Quarter -2003 QPR1 REV C doe <br />