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1 <br /> of all ground water samples collected at MW-2 and Figure 10 presents the <br /> historical cherrucal concentrations detected at MW-2 <br /> 1 At MW-6, the concentration of TPH-g and BTEX have been lower than or <br /> similar to those detected since ground water sampling was initiated With <br />' the exception of the most recent sampling event(29 February 2000), TPH- <br /> g and BTEX concentrations had consistently decreased since ORC <br /> injection was performed The increase in concentrations observed during <br />' the most recent sampling event is attributed to the significant increase in <br /> water level observed during this event Table 8 presents the results of all <br /> ground water samples collected at MW-6 and Figure 11 presents the <br /> historical chemical concentrations detected at MW-6 <br />' At MW-5 (immediately upgradient of the former tank location) <br /> concentrations of petroleum hydrocarbons have never been detected <br />' <br /> 36 MASS CALCULATIONS <br />' As with former tank site 1, mass calculations were completed to determine <br /> the amount of petroleum hydrocarbons removed at former tank site 2 due <br /> to (1) the excavation and disposal of soils and (2) the extraction and <br /> treatment of ground water Appendix B presents the details of the mass <br /> calculations <br />' The results of the mass calculations indicate that 308 pounds of petroleum <br /> hydrocarbons was removed from former tank site 2 as a result of <br /> remediation activities The mass calculations also conservatively estimate <br /> that the mass of petroleum hydrocarbons remaining in soil and ground <br />' water at former tank site 2 amounts to 131 pounds <br /> 1 <br /> 1 <br /> 1 <br />' ERM 15 HEINZ USA,3374 60.3/27/00 <br />