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I <br /> Table A-3 • <br /> Dual Phase Extraction System-Groundwater Extraction Performance Data <br /> ARCO 4932 <br /> 16 East Harding Way,Stockton California <br /> Notes <br /> a System start-up and shake-down Groundwater samples collected prior to mtltlal discharge Water held in knockout <br /> b MTBE reported by EPA method 8260B Asio reported as 390,000 pg1L by EPA method 624 <br /> c LEL monitoring device and totalizer certification conducted LEL monitoring device not waterproof replacement ordered Water held to knockout <br /> d Permanent system startup <br /> e System shut down for carbon changeout <br /> System restarted <br /> g Data not available at time of reporting <br /> h Benzene and MtBE analysis run without prior method blank Analysis run beyond the EPA recommended holding time reported benzene as 1,200 pg1L and MTBE as 29 000 <br /> pg1L <br /> i Groundwater extraction system was shut down to await for samples taken on 08/07/03 to confirm that effluent MtBE hit was in fact a laboratory anamoly The 08/07/03 <br /> samples were received 08/25/03 <br /> GWE system shut down due to air stripper failure <br /> k Totalizer obtained 09/09/03 <br /> 1 Totalizer obtained 08114/03 <br /> m Air stripper additive installed to prevent scaling <br /> I <br /> Tasco Marketing75949108MlARCO 4932 O&M Tables 3Q04 xls P i ge 2 of 2 <br />