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' At MW-3 (immediately upgradient of the former tank location) <br /> concentrations of petroleum hydrocarbons have never been detected <br /> 2.6 MASS CALCULATIONS <br />' Asart of the PHS/EHD checklist for site closure (Appendix A), an <br /> P PP <br /> estimate of the mass of chemicals removed and remaining at the former <br />' tank site is required Mass calculations were completed to determine the <br /> amount of petroleum hydrocarbons removed at the former tank site due <br /> to (1) the excavation and disposal of soils and (2) the extraction and <br /> treatment of ground water from the tank excavation Appendix B <br /> presents the details of the mass calculations <br />' The results of the mass calculations indicate that 847 pounds of petroleum <br /> hydrocarbons was removed from the former tank site 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 1 amounts to 90 pounds <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br />' ERM 10 HEINZ USA 3374 60.3/27/00 <br />