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APPENDIX $/RISK BASED CORRECTIVE ACTION TIER 1 AND TIER 2 ANALYSIS, <br /> S1TE CLOSURE EVALUATION REPORT <br />. Former Beacon Station No 695 <br /> 900 South Cherokee Lane <br /> Lodi, California <br /> Delta Project No D093-915 <br /> Page 10 <br /> above in Section 4 3 TPH as diesel may be interfering the quantification TPH as gasoline and therefore <br /> the amount of TPH as gasoline remaining in soil is likely to be lower The calculations illustrating <br /> petroleum hydrocarbon impacted sora remaining following remediation are included in Appendix E The <br /> residual layers of impacted soil used to calculate the remaining mass balance are illustrated in Figure 26 <br /> The mass balance estimation indicates an 89 percent reduction in TPH as gasoline and a 86 percent <br /> reduction of benzene at the site The percent reduction estimations for TPH as gasoline and benzene are <br /> included in Appendix F <br /> 6.0 MASS BALANCE CALCULATTONS GROUNID WATER <br /> Based on the March 21, 1994, quarterly ground water monitoring data, approximately 2 91 gallons of <br /> TPH quantified as gasoline and 0 008 gallons quantified as benzene were present in ground water at that <br /> date The March 21, 1994, data was used due to it being judged as a more complete data set than at the <br /> beginning of vapor extraction in 1991 The calculations estimating the mass of petroleum hydrocarbon <br /> impacted ground water prior to vapor extraction are included in Appendix G. Figures 27 and 28 were <br /> used in the calculation estimating the mass of petroleum hydrocarbons in ground water prior to <br /> remediation <br /> As of the second quarter 1996 ground water monitoring event, it is estimated that approximately 0 05 <br /> gallons of TPH as gasoline and 0 0016 gallons of benzene remain in ground water underlying the site <br /> The calculations illustrating petroleum hydrocarbons remaining in ground water are included in <br /> Appendix H Figures 29, 30, and 31 were used in the calculation estimating the mass of petroleum <br /> hydrocarbons in ground water following remediation <br /> The mass balance estimation indicates a reduction of 98 percent in TPH as gasoline and a 80 percent of <br /> benzene in ground water at the site The percent reduction estimation for TPH as gasoline and benzene <br /> are included in Appendix H <br /> RPT001 915 <br />