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Site History Canepa's Car Wash(Pacific Avenue) Page 7 of 7 • Condor conducted second quarter 2004 groundwater monitoring activities at the site on May 7, 2004 Monitoring wells MW-1 - MW-7, and MW-9 - MW-12D were measured for water level Monitoring wells MW-1, MW-2, MW-3, MW-4, MW-9, MW-11, and MW-12D and SVE well SV-4 were sampled during the event, consistent with the quarterly schedule Groundwater elevation data and laboratory analytical results were generally consistent with historic groundwater monitoring data The concentrations of MTBE and other gasoline oxygenates in MW-3 decreased relative to historic data Through the first quarter of 2004, the trend has been one of increasing MTBE concentrations in that well Condor continued to conduct remediation system planning and permitting activities during the second quarter of 2004 Condor conducted annual groundwater monitoring activities during the third quarter 2004 at the site on July 22 and 23, 2004 Depth to water measurements and groundwater samples were collected from monitoring wells MW-1 through MW-7, MW-9 through MW-12D and SVE well SV-4 Laboratory analytical results of the groundwater samples indicated that concentrations of petroleum hydrocarbon constituents were generally consistent with historical data Contaminant concentrations in the sample collected from MW-3 increased relative to the previous monitoring event and consistent with an increasing trend for MTBE in that well Groundwater elevation data indicated a northeast groundwater gradient generally consistent with historic groundwater gradients The SVE system continued to be out of service to allow for modifications to the system and property development, and has not been sampled since December 19, 2002 In a letter dated October 17, 2003, SJCEHD approved the RAF' submitted by Condor dated March 3, 2003 Condor is currently conducting installation of the treatment systems and anticipates start-up of the systems in October 2004 Condor conducted groundwater monitoring activities during the fourth quarter 2004 at the site on October 14, 2004 Depth to water measurements were collected from monitoring wells MW-2 through MW-7, MW-8 through MW-10, MW-12D, and SVE well SV-4 Groundwater samples were collected from monitoring wells MW-2 through MW-4, MW-9, MW-12D, and SVE well SV-4 Laboratory analytical results of the groundwater samples indicated that concentrations of petroleum hydrocarbon constituents were generally consistent with historical data Contaminant concentrations in the sample collected from MW-3 increased relative to the previous monitoring event and are consistent with an increasing trend for MTBE in that well Groundwater elevation data indicated a northeast groundwater gradient generally consistent with historic groundwater gradients The SVE system was returned to service on November 1, 2005 after modifications to the system and property development Condor conducted groundwater monitoring activities during the first quarter 2005 at the site on January 21, 2005 Depth to water measurements were collected from monitoring wells MW-1 through MW-7, MW-9 through MW-12D, and SVE well SV-4 Groundwater samples were collected from monitoring wells MW-1 through MW4, MW-9, MW-11, MW-12D, and SVE well SV-4 Laboratory analytical results of the groundwater samples indicated that with the exception of MW-1, concentrations of petroleum hydrocarbon constituents were generally consistent with historical data Contaminant concentrations in the sample collected from MW-1 increased sharply relative to the previous monitoring event due to active pumping drawing contamination to the well Contaminant concentrations in the sample collected from MW-3 decreased relative to the previous monitoring event Contaminant concentrations in the sample collected from MW-ll increased slightly relative to the July 2004 monitoring event (groundwater samples were not collected from MW-11 during the October 2004 groundwater monitoring event) Groundwater elevation data indicated that a cone of depression had formed at the location of MW-1 The SVE system continued to he In operation _ P\1000_pTj\1707 Canepa11707D Groundwater Mon:ton ng\ReportslReports12005 QMR12005 2nd gtrlappendix\BCanepa's SITS HISTORY doe