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Table 1 - C-Sparge System Pilot Test Groundwater Chemical Analytical Results ' Former Unocal Service Station #2859 1665 Pacific Avenue Stockton, California Sample TPHg Benzene Toluene Ethylbenzene Xylenes MtBE Well ID Date b b b b b b ' NP-1 (con't) 01/23/03 19,000 820 3,100 820 4,700 <200 02/21/03 23,000 1,500 5,000 790 6,900 <200 2127-281031 <50 <0 50 <0 50 <0 50 <0 50 <2 0 03/21/03 <50 <0 50 <0 50 <0 50 <0 50 <2 0 04/22/03 14 <0 50 <0 50 <0 50 <0 50 <2 0 05/19/03 <50 <0 50 <0 50 <0 50 <0 50 <2 0 ' 05/20/03 <50 <0 50 <0 50 <0 50 <0 50 <2 0 06/20/03 <50 <0 50 <0 50 <0 50 <0 50 <2 0 07/22/03 <50 <0 50 <0 50 <0 50 0 51 <2 0 08/22/03 <50 <0 50 <0 50 <0 50 <0 50 <2 0 8127-28103 <50 <0 50 <0 50 <0 50 <0 50 <2 0 09/18/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 10116120037 <50 <0 50 <0 50 <0 50 <0 50 <2 0 t 12/03/03 <50 <0 5 <0 5 <0 5 <1 0 <0 5 02/26/04 <50 <0 50 <0 50 <0 50 <1 0 <0 50 04/05/04 <50 <0 50 <0 50 <0 50 <1 0 <1 0 05/21/04 <50 0 98 2 0 <0 50 4 8 -- ' Explanations BTEX = Benzene, toluene, ethylbenzene, xylenes Analytical Laboratory MtBE = Methyl tert-butyl ether Sequoia Analytical (ELAP #11624) ppb = parts per billion C-Sparge system operational on August 14, 2002 Notes 1 Wells purged prior to sampling 2 Baseline concentrations ' 3 Laboratory report indicates gasoline C6-C10 4 MtBE confirmation by EPA Method 82606 5The opening calibration verification standard was outside acceptance limits by 1% ' Although the Laboratory Control Sample verified the accurary of the batch, this should be considered when evaluating the data s Current laboratory analytical results do not coincide with historical data, and although the laboratory ' results were confirmed, it appears that the samples were switched Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the requested fuel r i r 240072 06 r