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• <br />• <br />Chevron Products Company Page 4 <br />Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California October 31, 2002 <br />SVE operability exceeded 100% during the 3Q02. Table 5 and 5.1 present operational <br />measurements and calculated mass removal rates for TPHg and benzene, and MtBE, <br />respectively. <br />During the 3Q02, the SVE system removed approximately 21 pounds of TPHg and 0.2 <br />pounds of benzene. Since operation began, the SVE system has removed an estimated <br />4,123.6 pounds of TPHg, 85.7 pounds of benzene, and 443.8 pounds of MtBE. Mass <br />removal trends and influent soil vapor TPHg, benzene, and MtBE concentrations versus time <br />are shown on Figures 8 and 9, respectively. <br />SVE system emission data is presented in Table 6. <br />3.3 Estimated Mass of Hydrocarbons in Soil and Groundwater <br />The hydrocarbon mass estimates presented below are an update of results presented within <br />the Problem Assessment Report / Final Remediation Plan (PARIFRP) Addendum, dated June <br />5, 2001 and sections 3.1 and 3.2 above. Methodology for determining the mass of <br />hydrocarbons adsorbed to soil and dissolved in groundwater can be found within the <br />PAR/FRP Addendum. <br />3.3.1 Estimated Mass of Petroleum Hydrocarbons Adsorbed in Soil <br />The results presented below are based on the calculation presented within the PAR/FRP <br />Addendum and cumulative 3Q02 SVE mass removal data. To conservatively estimate <br />analyte mass remaining, historical soil analytical data was used. This information is <br />summarized in the following table: <br />L\Chevron\95775\Periodic Monitoring\Quarterly Progress Reports\2002\3rd Quarter -2002 Progress Report.doc <br />Maximum Constituent Concentration (ppmv) <br />Sampling <br />June 25 through September 24, 2002 <br />Location <br />TPHg <br />Benzene <br />Toluene <br />Ethyl- <br />Xylenes <br />MtBE <br />benzene <br />INFL <br />8.6 <br /><0.050 <br />0.21 <br />0.051 <br />0.62 <br /><0.10 <br />EFFL <br /><5.0 <br /><0.050 <br /><0.050 <br /><0.050 <br />0.27 <br /><0.10 <br />Explanations: <br />ppmv = Parts per million by volume <br />< Indicates the constituent was not present at or above the method reporting limit shown <br />SVE operability exceeded 100% during the 3Q02. Table 5 and 5.1 present operational <br />measurements and calculated mass removal rates for TPHg and benzene, and MtBE, <br />respectively. <br />During the 3Q02, the SVE system removed approximately 21 pounds of TPHg and 0.2 <br />pounds of benzene. Since operation began, the SVE system has removed an estimated <br />4,123.6 pounds of TPHg, 85.7 pounds of benzene, and 443.8 pounds of MtBE. Mass <br />removal trends and influent soil vapor TPHg, benzene, and MtBE concentrations versus time <br />are shown on Figures 8 and 9, respectively. <br />SVE system emission data is presented in Table 6. <br />3.3 Estimated Mass of Hydrocarbons in Soil and Groundwater <br />The hydrocarbon mass estimates presented below are an update of results presented within <br />the Problem Assessment Report / Final Remediation Plan (PARIFRP) Addendum, dated June <br />5, 2001 and sections 3.1 and 3.2 above. Methodology for determining the mass of <br />hydrocarbons adsorbed to soil and dissolved in groundwater can be found within the <br />PAR/FRP Addendum. <br />3.3.1 Estimated Mass of Petroleum Hydrocarbons Adsorbed in Soil <br />The results presented below are based on the calculation presented within the PAR/FRP <br />Addendum and cumulative 3Q02 SVE mass removal data. To conservatively estimate <br />analyte mass remaining, historical soil analytical data was used. This information is <br />summarized in the following table: <br />L\Chevron\95775\Periodic Monitoring\Quarterly Progress Reports\2002\3rd Quarter -2002 Progress Report.doc <br />