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First Quarter 2004 Groundwater Monitoring/Remediation Status Report Moore Petroleum Bulk Plant,5491 F Street,Banta,California f Page 6 System performance totals: Pounds of TPH removed: This Quarter Cumulative 273 pounds (43 gallons) 4,799 pounds (761 gallons) i Pounds of benzene removed: 0.4 pounds 1.8 pounds I Status of system operation during period/ reasons for f g reportinidowntime: During this reporting period, December 22, 2003, through March 22, 2004, the SVE s stem di not operate continuously. System shut d y d visit except for the March 22, 2004 visit. All system shut ddow dby owns e duet apex ehi h l for each site condition on the vapor knockout drum, with the exception of the February 10 visig level ch was a deliberate shut down for the quarterly monitoring event. According to hour meter readings and field data, the system operated for a total of 37 days during this period. An increase in influent concentrations for TPHg and benzene were reported for this quarter. All effluent samples collected during this reporting period were non-detect for TPHg and benzene concentrations. Va or Anal sis Performed: Analysis Abbreviation Designation USEPA Method No. Total Petrofeum Hydrocarbons Gas-Range as Gasoline TPHg 8260B Hydrocarbons Benzene Toluene Aromatic Et h Ibenzene BTEX Volatile 8260B Xyienes (Total) . Organics Methyl Tertiary Butyl Ether MTBE Fuel Oxygenate 82608 . CONCLUSIONS AND RECOMMENDATIONS Based on groundwater analytical results, concentrations remained consistent this quarter compared with Iast quarter. Hydrocarbon concentrations classified as TPHd and TPHmo continue to vacillate between each other due to laboratory interpretation of the results. The domestic well sampling results for all three sampling events during the quarter were below detection limits. The proposed ozone system will attenuate these heavy range hydrocarbons. - Groundwater elevations decreased an average 1.18 feet this-quarter compared with last quarter.