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' • The mass balance calculations for the previously removed petroleum hydrocarbon <br /> ' contaminated soil and the residual impacted soil are presented in Table 5 Calculations of <br /> the mass of residual TPHd 1n soil from 5 feet to 9 feet bgs are presented 1n Appendix VI <br /> ' • A Closure Document Application is included 1n Appendix VII <br /> ' 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Overexcavatlon of the former UST pit succeeded in removing all of the TEX and the bulk of the <br /> TPHd from soil to 9 feet bgs Residual soil contamination 1s limited to low concentrations of <br /> TPHd detected in a small area immediately adjacent to the light pole on-site, and small areas <br /> around the edge of the former overexcavatlon In addition, groundwater on-site 1s no longer <br /> impacted by soil contamination Based upon historical analytical data, this residual soil <br /> contamination should not result in adverse effects to public health or beneficial uses <br /> Analytical results indicate that natural blodegradative and dispersion processes will reduce the <br /> small amount of remaining contaminants over time Case closure 1s recommended <br /> 1 <br /> 1 <br /> 1 <br /> w 1967311reporb\Closure doc 9 <br /> • <br /> Sian <br />