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Canepa's Car Wash 6230 Pacific Avenue,Stockton,CA First Quarter Groundwater Momtonng Report,January 2006 Page 7 of 9 . system effluent Monthly samples for laboratory analyses are collected from the system influent and effluent, and the correction factor ,for the PID is adjusted accordingly on an on-going basis The data and calculations can be found in Appendix D, SVE Vapor Stream Sample Laboratory Analytical and PID Results Fourteen PID measurements of the system influent and effluent were collected between October 31, 2005 and January 31, 2006 The average PID influent measurement was 35 7 ppm and the average effluent measurement was 0 1 ppm The average corrected PID reading is calculated using the above mentioned correction factor, resulting in an average corrected influent PID measurement of 50 2 ppm The average corrected PID value was multiplied by the laboratory-supplied conversion factor of approximately 4 Mg/M3 for TPH-G in different units for use in following calculations The unit conversion resulted in an ' average influent concentration of 200 8 mg/m3 An average airflow of 276 6 CFM was them used to calculate the mass of approximately 383 23 pounds of TPH-G removed by the system during the first quarter of 2006 A similar calculation procedure was followed for the system effluent to calculate the TPH-G released by the system to the atmosphere Using the airflow of 276 6 CFM, the mass of TPH-G released by the system was calculated to be approximately 7 6 pounds, resulting in a destructive efficiency of approximately 98 3%for the period Vapor Phase Destructive Efficiency Of the approximately 10,528 63 pounds of TPH-G removed by the soil vapor extraction system and air- stripper to date, the catalytic oxidizer destroyed approximately 10,364 63 pounds and approximately 164 0 pounds have been released to the atmosphere This results in an overall destructive efficiency of approximately 98 5%0 A worksheet showing the SVE calculations for the current quarter is included m Attachment D, SVE Mass Removal Calculation Worksheet SUMMARY The concentration of MTBE at MW-3 was lower than detected during the fourth quarter of 2005, but remains at elevated levels compared to historically lower levels when monitoring began in August of 1996 EDB was detected for the second consecutive quarter, and preceded by the first detection at the Site in MW-1 during the fourth quarter of 2005 None of the contaminants of concern were detected at or above the laboratory reported detection limits in monitoring wells MW-4, MW-9, and MW-12D All other measurements and laboratory data for were generally consistent with previous quarters and trends The system operated approximately 1,844 3 hours between October 31, 2005 and January 31, 2006, which is 83 5% of the trine The system has been in operation for a total of 6,263 hours since it began operating (November 1, 2004) through January 31, 2006 The groundwater treatment system removed petroleum hydrocarbons from approximately 476,152 gallons of groundwater during the first quarter of 2006, and a total of approximately 1,535,498 gallons have been treated by the system as of January 31, 2006 The average groundwater pumping rate between October 31, 2005 and January 31, 2006, was I approximately 4 29 gallons per minute Condor estimates that approximately 92 2 pounds of gasoline have been removed from the groundwater during the first quarter of 2006 and approximately 314 9 pounds of gasoline since the pump and treat system was placed in operation on November 1, 2004 The soil vapor extraction system removed approximately 383 23 pounds of gasoline from the soil during the first quarter of 2006 and approximately 10,528 63 pounds of petroleum hydrocarbons since the SVE system was placed in service on November 1, 2004 �a CONDOR