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ADDENDUM 2- REPORT OF CORRECTIVE ACTIONS AND RECOMMENDATION FOR <br /> SITE CLOSURE (May 25, 2001) <br /> Estimated Mass of Hydrocarbons Recovered from Soil Vapor and Groundwater Extraction <br /> 151 South Main Street, Manteca, California <br /> Estimated Mass of TPHg and Benzene Recovered from Extracted Groundwater <br /> 1 2 3 4 5 <br /> water water Avg Conc grams pounds <br /> Contaminant gallons liters (ug/L) <br /> TPHg 6,295,740 24,238,599 6,000 145,432 320 <br /> Benzene 1 6,295,740 1 24,238,599 154 3,733 8 <br /> TPHg Total Petroleum Hydrocarbons as gasoline <br /> 1 Total groundwater produced in gallons <br /> 2 Total groundwater produced in liters <br /> 3 Approximate avg concentration of contaminant in extracted groundwater <br /> (micrograms per liter) based on data presented in Tables 4 and 5) <br /> 4 Total grams of dissolved contaminant recovered (col 2 X col 311,000,000) <br /> 5 Total pounds of dissolved contaminant recovered (col 41454) <br /> Estimated Mass of TPHg Recovered from Extracted Soil Vapor <br /> 623 pounds (see Table 6) <br /> • CALCULATED PERCENT RECOVEREY BASED UPON MASS CALCULAIONS <br /> Ratio of Remaining TPHg to Recovered (2 881320) 0 009 090% <br /> Ratio of Remaining Benzene to Recovered (0 03718) 0004625 046% <br /> Assuming the calculated amount remaining plus the amount recovered represents the <br /> total original mass the total amount of Tphg recovered exceeds 99 percent and the <br /> total amount of benzene recovered exceeds 99 6 percent <br /> These results are very consistent with the concentration reduction percentages presented <br /> in Table 7 <br />