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m oblMM IMM M S Mir M M M M M r! MO _ +, <br /> Mass Balance Calculation Benzene <br /> Estimated Pre Remediation Benzene Amount Recovered by GAC <br /> Pounds <br /> Soil 9 Appendix A-ITEM III History of Sod Anlaysis <br /> Groundwater 2 6 Appendix C-ITEM V Calulation of Benzene Mass in Groundwater <br /> Total 12 <br /> Remediation Amount Recovered(GAC) <br /> Soil Vapor Extraction Unknown Table 6 <br /> Groundwater Extraction 18 Table 4 <br /> Total 18 <br /> Difference -6 Difference within assumed margin of error <br /> GAC <br /> Soil Vapor Influent Analyzed With Portable Field Analyzer, benzene not determined <br />