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Table 1. Chemicals Detected Groundwater and Their Concentrations,Chevron Fuel Terminal 1001621, Banta, California <br /> Chemical MW-69UA WSW-1 Concentration <br /> Date Collected 6113/06 9111/06 12/05106 3/6107 9111106 316107 Maximum Arithmetic <br /> Avera e <br /> Depth to Water 4.91 3.92 6.31 6.48 NA NA <br /> Benzene 94 92 310 40 <0.5 <0.5 310 134 <br /> Eth (benzene 18 7 36 3 <0.5 <0.5 36 16 <br /> Methyl-tert-butylether 70 56 240 31 NA NA 240 99 <br /> Tertia bu I alcohol 6 7 19 4 NA NA 19 9 <br /> Tertia am I meth I ether 1 0.73 <0.5 NA NA 3 2 <br /> Toluene 1 <0.5 5 <0.5 <0.5 <0.5 5 3 <br /> X lenes 55 21 95 10 <0.5 0.6 95 36 <br /> Notes: <br /> Based on last four groundwater sampling events conducted beneath the onsite office building. <br /> Concentration units are in micrograms per Liter(Ng/L). <br /> Depth to water in units of feet below grade(fbg). <br /> <= Not detected at the specified reporting limit. <br /> NA= Not available. <br /> 7/18/2007 Page 1 of 1 <br /> G:\DIV 11\D0007\1001621_004711100_Tier I RBCA Evaluation_Tables.xls <br />