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• 4 SUMMARY AND RECOMMENDATIONS Groundwater-monitoring has been conducted at this facility since 1999 to evaluate groundwater quality A summary of the current site conditions and a ' recommendation for subsequent work are as follows • During this event, the average depth to groundwater in the wells was 28 44 feet bgs (48 68 feet msl), which indicates an approximate 1 68 foot decrease in elevation from the previous event The groundwater flow was generally easterly at a gradient of about 0 004 feet per linear foot • Ethylbenzene, xylenes, and TPH-g were detected in well MW-2 • Any reported BTEX and MTBE concentrations were compared to the California Drinking Water MCLS Based on the current groundwater- monitoring data, none of the MCLs have been exceeded in any of the wells S BTEX, TPH-g, and oxygenates were not detected in the samples collected from wells MW-1, MW-3, or MW-4 • The SVE system was malfunctioning upon the weekly site visit on August 31, 2005 The system was repaired and re-engaged on September 28, 2005 Weekly air samples were collected throughout the rest of this quartet without any further system malfunctions ' • The SVE system was disengaged after collecting the December 13, 2005 weekly samples per a verbal approval by SJCEHD on November 30, 2005 • The current total mass of TPH-g removed from the soil is estimated at 190 pounds, which is approximately 56% of the initial estimated contaminate amount The overall mean average influent rate of TPH-g was 3 17 lbs/day, while the average enussion rate after treatment was 0 12 lbs/day Therefore, the VOC removal efficiency was approximately 96% Based on the results of this quarterly sampling event, it appeared that the SVE system could be disengaged and the activities for Site closure could be implemented PSC and ETIC recommended that the current quarterly groundwater-monitoring plan continue as is for four more quarters ending with the fourth quarter of 2006 PSC and ETIC discussed the closure activities with SJCEHD on November 10, 2005 and again on November 30, 2005 The closure activities to be implemented with SJCEHD ' approval will be discussed in subsequent quarterly reports • 11 Quarterly Groundwater Monitoring Report 4th Quarter-November 2005 Prepared for SARA LEE BAKERY GRoup,INC Prepared by PSC Environmental Services ' investigative and Quarterly Report\4m Quarterly Repon t i-2005 dog February 24,2006