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• <br />• <br />Chevron Products Company Page 4 <br />Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California April 15, 2002 <br />SVE operability exceeded 100% during the I' quarter. 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 I' quarter, the SVE system removed approximately 2.7 pounds of TPHg, 0.1 <br />pounds of benzene, and OA pounds MtBE. Since operation began, the SVE system has <br />removed an estimated 4,097.9 pounds of TPHg, 85.4 pounds of benzene, and 443.8 pounds <br />of MtBE. Mass removal trends and influent soil vapor TPHg, benzene, and MtBE <br />concentrations versus time 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 (PAR/FRP) 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 I" quarter 2002 SVE mass removal data. To conservatively <br />estimate analyte mass remaining, historical soil analytical data was used. This information is <br />summarized in the following table: <br />1:1Chevron1957751Periodic Monitoriag\Quarterly Progress Reports1200211 st Quarter -2002 Progress Report,doc <br />Maximum Constituent Concentration (ppmv) <br />Sampling <br />December 19 through March 20, 2002 <br />Location <br />TPHg <br />Benzene <br />Toluene <br />Ethyl- <br />Xylenes <br />MtBE <br />benzene <br />INFL <br />24 <br /><0.050 <br />0.31 <br />0.33 <br />4.5 <br />0.5 <br />EFFL <br />10 <br /><0.050 <br />0.11 <br />0.13 <br />1.8 <br />0.12 <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 I' quarter. 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 I' quarter, the SVE system removed approximately 2.7 pounds of TPHg, 0.1 <br />pounds of benzene, and OA pounds MtBE. Since operation began, the SVE system has <br />removed an estimated 4,097.9 pounds of TPHg, 85.4 pounds of benzene, and 443.8 pounds <br />of MtBE. Mass removal trends and influent soil vapor TPHg, benzene, and MtBE <br />concentrations versus time 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 (PAR/FRP) 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 I" quarter 2002 SVE mass removal data. To conservatively <br />estimate analyte mass remaining, historical soil analytical data was used. This information is <br />summarized in the following table: <br />1:1Chevron1957751Periodic Monitoriag\Quarterly Progress Reports1200211 st Quarter -2002 Progress Report,doc <br />