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Table i43 <br /> Dual Phase Extractlon 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 intibal discharge Water held in knockout <br /> b MtBE reported by EPA method 8260B Aslo reported as 390 000 1 by EPA method 624 <br /> c LEL monitoring device and totalizer certificabon conducted LEL monitoring device not waterproof replacement ordered Water held in 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 ran without prior method blank Analysis run beyond the EPA recommended holding time reported benzene as 1 200 pg/L and MtBE as 29,000 <br /> I <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 08/14/03 <br /> m Air stripper additive installed to prevent scaling <br /> Tosco Markebngr594910&MIARC0 4932 O&M Tables 1004 Page 2 of 2 <br />