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• • • Chevron Products Company Page 2 Former Chevron Service Station ##9-5775, 301 West Kettleman lane, Lodi, Call forma October 12, 2001 To assess effectiveness of the SVE, process samples were collected twice per month from the vapor stream before (INFL) and after (EFFL) the catalytic oxidizer Each sample was analyzed for TPHg, BTEX, and MtBE Maximum concentrations of detected constituents are presented below Explanations ppmv = Parts per million by volume < Indicates the constituent was not present at or above the method reporting limit shown SVE operability exceeded 98 9% during the 3rd quarter Table 3 and 4 present operational measurements and calculated mass removal rates for TPHg and benzene, and MtBE, respectively During the 3rd quarter, the SVE system removed approximately 155 1 pounds of TPHg, 0 l pounds of benzene, and 18 pounds MtBE Since operation began, the SVE system has removed an estimated 4,046 5 pounds of TPHg, 85 3 pounds of benzene, and 443 0 pounds of MtBE Mass removal trends and influent soil vapor TPHg, benzene, and MtBE concentrations versus time are shown on Figures 5 and 6, respectively SVE system emission data is presented in Table 5 RECOMMENDATIONS • SECOR recommends the continued operation of the GWE and SVE systems during the 4th quarter 2001 11Chevron19577510&M\3rdQuarter 2001130&M R01 review doe Maximum Constituent Concentration (ppmv) Sampling Location TPHg Benzene Toluene Ethyl- Xylenes MtBE benzene INFL 42 <0 050 0 85 0 75 7 1 074 EFFL 15 <0 050 029 026 2 6 0 19 Explanations ppmv = Parts per million by volume < Indicates the constituent was not present at or above the method reporting limit shown SVE operability exceeded 98 9% during the 3rd quarter Table 3 and 4 present operational measurements and calculated mass removal rates for TPHg and benzene, and MtBE, respectively During the 3rd quarter, the SVE system removed approximately 155 1 pounds of TPHg, 0 l pounds of benzene, and 18 pounds MtBE Since operation began, the SVE system has removed an estimated 4,046 5 pounds of TPHg, 85 3 pounds of benzene, and 443 0 pounds of MtBE Mass removal trends and influent soil vapor TPHg, benzene, and MtBE concentrations versus time are shown on Figures 5 and 6, respectively SVE system emission data is presented in Table 5 RECOMMENDATIONS • SECOR recommends the continued operation of the GWE and SVE systems during the 4th quarter 2001 11Chevron19577510&M\3rdQuarter 2001130&M R01 review doe