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Site History
<br /> Canepa's Car Wash(Pacific Avenue)
<br /> Page 9 of 10
<br /> been removed from the groundwater during the third quarter of 2005 and approximately 160 pounds of
<br /> gasoline since the pump and treat system was placed in operation on November 1, 2004 The soil vapor
<br /> extraction system removed approximately 96 pounds of gasoline from the soil during the third quarter of
<br /> 2005 and approximately 9,856 pounds of petroleum hydrocarbons Since the SVE system was placed in
<br /> service on November 1, 2004
<br /> Fourth quarter 2005 monitoring activities were conducted on October 13, 2005, and September 12, 2005
<br /> Field observations were made at the 11 site monitoring wells (MW-1 through MW-7 and MW-9 through
<br /> MW-12D) and one soil vapor extraction well (SV-4) on October 13, 2005 Groundwater samples collected
<br /> from the monitoring wells indicated that none of the constituents of concern were detected at or above the
<br /> laboratory reported detection limits in monitoring wells MW-4, MW-9, and MW-12D All other
<br /> measurements and laboratory data were generally consistent with previous quarters and trends with the
<br /> exception of EDB and MTBE The concentration of MTBE at MW-3 was the highest ever detected at the
<br /> monitoring well since monitoring began in August of 1996 EDB was detected for the first time at the Site
<br /> in MW-1
<br /> Groundwater samples collected from the SVE wells (SV-1 through SV-9) on September 12, 2005 and from
<br /> SV-4 on October 13, 2005, indicated that concentrations of BTEX, MTBE, or TPH-G were detected at or
<br /> above the laboratory detection limits in all the wells,which is consistent with historic results for those wells
<br /> The system operated approximately 1,449 7 hours between July 29, 2005 and October 31, 2005, which is
<br /> 63% of the time The system had been in operation for a total of 4,418 7 hours since it began operating
<br /> (November 1, 2004) through October 31, 2005 The groundwater treatment system removed petroleum
<br /> hydrocarbons from approximately 354,033 gallons of groundwater during the fourth quarter of 2005, and
<br /> a total of approximately 1,059,346 gallons had been treated by the system as of October 31, 2005 The
<br /> average groundwater pumping rate between July 29, 2005 and October 31, 2005, was approximately 3 96
<br /> gallons per minute Condor estimated that approximately 66 63 pounds of gasoline had been removed
<br /> from the groundwater during the fourth quarter of 2005 and approximately 2213 pounds of gasoline since
<br /> the pump and treat system was placed in operation on Noyember 1, 2004 The soil vapor extraction
<br /> system removed approximately 289 3 pounds of gasoline from the soil during the fourth quarter of 2005
<br /> and approximately 10,145 4 pounds of petroleum hydrocarbons since the SVE system was placed in
<br /> service on November 1, 2004
<br /> Condor replaced the groundwater extraction pump used tri MW-1 in late December 2005
<br /> First quarter 2006 monitoring activities were conducted on January 27, 2006 Field observations were made
<br /> at the 11 site monitoring wells and one soil vapor extraction well (SV-4) on January 27, 2006 Groundwater
<br /> samples collected from the monitoring wells indicated that none of the constituents of concern were detected
<br /> at or above the laboratory reported detection limits in monitoring wells MW-4, MW-9, and MW-12D All
<br /> other measurements and laboratory data were generally consistent with previous quarters and trends with
<br /> the exception of EDB,which was detected for the second time at the site in MW-1
<br /> The groundwater sample collected from SVE well SV-4 on January 27,2006, indicated that concentrations of
<br /> BTEX, MTBE, or TPH-G were detected at or above the laboratory detection limits, which is consistent with
<br /> historic results for that well
<br /> The system operated approximately 1,844 hours between October 31, 2005 and January 31, 2006, which
<br /> is 84% of the time The system had been in operation for d total of 6,263 hours since it began operating
<br /> (November 1, 2004) through January 31, 2006 The groundwater treatment system removed petroleum
<br /> hydrocarbons from approximately 476,152 gallons of groundwater during the first quarter of 2006, and a
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