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Table 1 - C-Sparge System Pilot Test Groundwater Chemical Analytical Results <br /> Former Unocal Service Station#2859 <br /> 1665 Pacific Avenue <br /> Stockton,California <br /> Sample TPHg Benzene Toluene Ethylbenzene Xylenes MtBE <br /> Well ID Date (ppb) (ppb) (ppb) b) (ppb) (ppb) <br /> NP-1 8/09-10/021 2 <50 <0 50 081 <0 50 0 52 <2 5 <br /> 08/22/02 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <br /> 9/20/2002 <50 <0 50 <0 50 <0 50 23 <2 5 <br /> 10/21/02 2,600 48 17 150 700 <50 <br /> 11/07-09/02' <50 <0 50 <0 50 <0 50 <0 50 <2 5 <br /> 11/21/02 25,000 1,600 5,300 1,200 6,400 <250 <br /> 12/18/02 Not Sampled-Well Inaccessible <br /> 01/23/03 19,000 820 3,100 820 4,700 <200 <br /> 02/21/03 23,000 1,500 5,000 790 6,900 <200 <br /> 2/27-28/031 <50 <0 50 <0 50 <0 50 <0 50 <2 0 <br /> 03/21/03 <50 <0 50 <0 50 <0 50 <0 50 <2 0 <br /> Explanation, <br /> Wells were not purged prior to sampling TPHg,BTEX, and MtBE by DHS LUFT Methods <br /> TPHg=Total Petroleum Hydrocarbons as gasoline <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes Analytical Laboratory: <br /> MtBE=Methyl tert-butyl ether Sequoia Analytical(ELAP#1624) <br /> ppb=parts per billion <br /> C-Sparge system operational on August 14,2002 <br /> Notes. <br /> I Wells purged prior to sampling <br /> 2 Baseline concentrations <br /> 3 Laboratory report indicates gasoline C6-C10 <br /> 4 MtBE confirmation by EPA Method 8260B <br /> 5 The opening caltberation verification standard was outside acceptance limits by 1% <br /> Although the Laboratory Control Sample venfied the accurary of the batch,this should be considered when <br /> evaluating the data <br /> 240072 06 2 of 2 <br />