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Mob = = = = MM = 4rmmmmmm -O <br /> Mass Balance Calculation TPHg <br /> Estimated Pre Remediation TPHg Amount Recovered by GAC <br /> Pounds <br /> Soil 2,035 Appendix A-ITEM VI Calculation of TPHg Mass is Soil <br /> Groundwater 53 Appendix C-ITEM V Calulation of TPHg Mass in Groundwater <br /> Total 2,088 <br /> Remediation Amount Recovered(GAC) <br /> Soil Vapor Extraction 624 Table 6 SVE Influent Log (shows product recovery) <br /> Groundwater Extraction 511 Table 4 Groundwater Production and Dissolved Product Recovery Log <br /> Total 1135 <br /> Difference 953 <br /> The difference of 953 lbs of TPHg between the estimated pre-remediation 2,088 lbs and the <br /> recovered 953 lbs is well within the margin of error It is RMA's oppinion however that the <br /> difference may be lagely a result of bio-degradation process enhanced by the oxygenation <br /> caused by the extraction of groundwater and soil vapor <br /> I <br />