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Canepa s Car Wash 6230 Pacific Avenue,Stockton,CA Third Quarter Groundwater Monitoring Report,July 2005 Page 7 of 8 SUMMARY • Concentrations of MTBE at MW-1 were the highest ever measured at the monitoring well, while concentrations of MTBE at MW-3 have been increasing over the previous sampling events None of the contaminants of concern were detected at or above the laboratory reported detection limits in monitoring wells MW-4 through MW-7, MW-9, MW-10, and MW-12D All other measurements and laboratory data were generally consistent with previous quarters and trends The system operated approximately 1,332 hours between April 15, 2005 and July 28, 2005, which is 53% of the time, whereas the total operational hours for the system since it began operating (November 1, 2004) through July 28, 2005 has been 2,969 hours, which is 46% of the time The groundwater treatment system removed petroleum hydrocarbons from approximately 348,873 gallons of groundwater during the third quarter of 2005, and a total of approximately 705,313 gallons have been treated by the system as of July 28, 2005 The average groundwater pumping rate between April 15, 2005, and July 28, 2005, was approximately 4 35 gallons per minute Condor estimates that approximately 71 pounds of gasoline have been removed from the groundwater during the third quarter of 2005 and approximately 160 pounds of gasoline since the pump and treat system was placed in operation on November 1, 2004 The soil vapor extraction system removed approximately 96 pounds of gasoline from the soil during the third quarter of 2005 and approximately 9,856 pounds of petroleum hydrocarbons since the SVE system was placed in service on November 1, 2004 FUTURE WORK In a letter dated February 4, 2003, Mr Jeffrey Wong of the SJCEHD approved Condor's proposal to reduce quarterly sampling of MW-5, MW-6, MW-7, and MW-10 to an annual basis, and to destroy of • MW-8 to accommodate Site development Annual groundwater monitoring of wells MW-5, MW-6, MW- 7, and MW-10 is currently conducted during the third quarter It is anticipated that a new monitoring well in the vicinity of MW-8 and an additional down-gradient well will be installed within the next year The next quarterly groundwater monitoring event is scheduled for October 2005, and will include sampling of monitoring wells MW-1 through MW-4, MW-9 through MW-11, MW-12D, and SVE well SV-4 Monitoring wells MW-1 and MW-11 are dedicated groundwater extraction wells and may be sampled separately to meet the Groundwater Discharge Permit requirements The SVE and groundwater pump and treat system will be kept in operation and periodically maintained The soil vapor portion of the system is monitored weekly with a PID and monthly with laboratory analyses The groundwater portion of the system is monitored monthly and water samples are collected from the first and second carbon tanks The sample collected from the outlet of the second carbon tank will be held by the laboratory and not analyzed unless detectable concentrations are confirmed from the sample collected from the outlet of the first carbon tank Samples will be analyzed for BTEX, MTBE, and TBA by the laboratory using EPA Method 8260B LIMITATIONS AND SIGNATURE This report was prepared under the direct supervision of a Registered Geologist in the State of California The standard of care for all services performed or furnished by Condor is commensurate with the care and skill ordinarily used by a member of the environmental profession practicing under similar conditions at the same time in the same locality Condor is not responsible for the accuracy and completeness of --- • information collected and developed by others CONDOR