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Canepa's Car Wash 6230 Pacific Avenue,Stockton,CA Fourth Quarter Groundwater Momtormg Report,October 2005 Page 7 of 9 . 0 79 ppmv respectively Corresponding PID measurements for the August 10, 2005 analyses were 10 9 ppm and 0 1 ppm The measurements for the September 9, 2005 analyses were 30 7 ppm and 0 3 ppm respectively The measurements for the October 12, 2005 analyses were 61 6 ppm and 0 1 ppm respectively A correlation was created between the TPH-G concentrations obtained from the laboratory sample analyses and the PID measurement to provide an empirical correction factor for the PID measurements This correlation was created for concentrations from the system influent as well as the system effluent Monthly samples for Iaboratory analyses are collected from the system influent and effluent, and the correction factors for the PID is adjusted accordingly on an on-going basis Eleven PID measurements of the system influent and effluent were collected between July 29, 2005 and October 31, 2005 The average PID influent measurement was 39 6 ppm and the average effluent measurement was 0 3 ppm The average PID reading is calculated using the above mentioned correction factor, resulting in an average corrected influent PID measurement of 59 7 ppm The average corrected PID value was multiplied by the laboratory-supplied conversion factor of approximately 4 Mg/M3 for TPH-G, resulting in an average influent concentration of 238 8 mg/m3 An average airflow of 223 2 CFM was then used to calculate the mass of approximately 289 3 pounds of TPH-G removed by the system during the period 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 223 2 CFM, the mass of TPH-G ' released by the system was calculated to be approximately 7 07 pounds, resulting in a destructive efficiency of approximately 97 6% for the period Vapor Phase Destructive Efficiency Of the approximately 10,145 4 pounds of TPH-G removed by the soil vapor extraction system and air- stripper to date, the catalytic oxidizer destroyed approximately 9,988 1 pounds and approximately 156 4 . pounds have been released to the atmosphere This results in an overall destructive efficiency of approximately 98 5% A worksheet showing the SVE calculations for the current quarter is included in Attachment D SUMMARY The concentration of MTBE at MW-3 was the highest ever detected at the monitoring well since monitoring began in August of 1996 EDB was detected for the first time at the Site in MW-i 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 1,449 7 hours between July 29, 2005 and October 31, 2005, which is I 63% of the time The system has been in operation for a total of 4418 7 hours since it began operatmg (November 1, 2004) through October 31, 2005 The groundwater treatment system removed petroleum hydrocarbons from approximately 354,033 gallons of groundwater during the fourth quarter of 2005, and a total of approximately 1,059,346 gallons have been treated by the system as of October 31, 2005 The average groundwater pumping rate between July 29, 2005 and October 31, 2005, was approximately 3 96 gallons per minute Condor estimates that approximately 66 63 pounds of gasoline have been removed from the groundwater during the fourth quarter of 2005 and approximately 221 3 pounds of gasoline since the pump and treat system was placed in operation on November 1, 2004 The soil vapor extraction system removed approximately 289 3 pounds of gasoline from the soil during the fourth quarter of 2005 and approximately 10,145 4 pounds of petroleum hydrocarbons since the SVE system was placed in service on November 1, 2004 _ • k e: CONDOR