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On April 6 2005, the ozone generator had again been tripped off due to the ozone meter automatic . shutdown The cause of the leak or leaks in the system remains unidentified As this system failed to remain operational for more than one day at a time during the prior three weeks, the ozone system was shut down indefinitely ' The catalytic oxidizer unit was replaced in June 2003 with a 300-cfm blower using granular activated carbon (GAC) to abate contaminants The 300 cfm blower with GAC was replaced by a 250 cfm ' blower with a catalytic oxidizer unit in February 2004 Additional details of the remediation well installation and system startup are described in Secor's Remediation Well and Soil Vapor Extraction System Installation Report, dated November 27, 2002 24 Domestic Wells ' Four domestic water supply wells (DW-1R, DW-2R, DW-3 and DW-4), two Inactive domestic water supply wells (DW-1, DW-2) are located within 340 feet of the former tank pit(Figure 2) Well # Location from Tank Pit Comments DW-1 90 feet west Upgradient of tank pit (onsite well) DW-1R 120 feet west Upgradient of tank pit (onsite well) DW-2 120 feet south Downgradient well (well destroyed) DW-3 245 feet south Downgradient of tank pit DW-4 340 feet south Downgradient of tank pit DW-2R 200 feet south Downgradient of tank pit(well installed December 2000 to replace DW-2) Water samples collected from domestic wells have been analyzed for the presence of TPHg, BTEX, FOCs, 1,2-DCA, and EDB Since water samples collected from DW-2 contained reportable concentrations of MTBE, the well was taken out of service and replaced with DW-2R Domestic well DW-1 is considered a public water supply because it services a retail store (Ranch Market) The nitrate concentrations detected in water samples collected from DW-1 exceeded the drinking water standards A replacement well (DW-1R) for DW-1 was constructed in February 2004 and put in service sometime between July 7 and 11, 2004 Well DW-1 was disconnected in July 2004 and is inactive In accordance with a letter from San Joaquin County Environmental Health Department (SJCEHD) dated February 26, 2004, sampling of well DW-1 has ceased 2.5 Free Product Free product was first observed in groundwater monitoring well MW-3 during the Fourth Quarter 2003 sampling event conducted in January 2004 Upon discovery of the free product, Geocon began frequent monitoring of the product level and bailing to remove it Measured product thickness ranged from an . initial maximum of 0 5 foot on January 9, 2004 to 0 012 foot on February 9, 2004 Project No S8643-06-01 4- September 28,2005