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C A M B R I A Feasibility Test Report JIMCO Truck Plaza 1022 Frontage Road, Ripon, California November 16, 2005 test Soil samples collected from the pilot boring for well MW-9 at 15, 20, 25, and 30 ft bgs were submitted to the laboratory for analysis No soil samples collected from boring EW-1 were submitted to the laboratory for analysis TPHg was detected in soil samples collected from boring MW-9 at 20, 25 and 30 ft bgs at concentrations of 260,0 36 and 0 24 mg/kg, respectively No benzene was detected in any of the soil samples analyzed MTBE was detected in samples collected from boring MW-9 at 15, 25, and 30 ft bgs at concentrations of 0 016, 0 54, and 0 27 mg/kg, respectively TPHd was only detected in the 20 ft sample at a concentration of 800 mg/kg June 2002 In June 2002, AGE conducted a 48-hr groundwater extraction pilot test to assess the characteristics of the aquifer and its response to groundwater extraction The test was performed on extraction well EW-I screened from 16 to 36 ft bgs A maximum drawdown of 9 76 feet was measured in extraction well EW-1 while pumping at a constant rate of 6 gpm A maximum drawdown of 0 40 feet was observed in observation well MW-1, located 20 feet away from the extraction well Additional details are presented in AGE's November 6, 2002 Well Installation and Groundwater Aquifer Pumping Test Report - May 2004 In May 2004, TEC Accutite removed one 1,000-gallon, steel waste oil tank Soil samples collected by Cambria during the UST removal activities (TPI and TP2) confirmed that soil beneath the UST was minimally impacted by TPHd TPHd was detected at concentrations of 4 0 and 160 mg/kg Groundwater Monitoring The current wells have been monitored and sampled since May 1998 Historical groundwater analytical data is presented in Table 2 30 FEASIBILITY TEST ACTVITIES This section provides the rationale and objectives, a description of field activities, and results of the feasibility testing conducted at the subject site 3 1 Rationale and Objectives Rationale Soil data indicates that gasoline and diesel-impacted soil is present primarily between 15 to 25 ft bgs in the vicinity of the former USTs, and with shallower gasoline and diesel- impacted soil present beneath the eastern line of former dispensers Groundwater levels have dropped over 10 feet since 1998 The steady drop in groundwater levels at the site has effectively left the majority of impacted soil above the current groundwater table Therefore, SVE was proposed as a logical remedial technology to cleanup the vadose zone 5 �