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Table 3. Analytical Results,ARCO Station 5080, <br /> Lathrop, California <br /> Monitoring well <br /> number and Concentrations in ug/I <br /> date sampled Benzene Toluene Ethylbenzene Xylenes TPH(a) Total lead <br /> AL-1 <br /> 4/27/87 <0.5 <0.5 NA(b) <0.5 <I000 <br /> 12/21/87 <0.5 <0.5 12 <br /> NA <0.5 I NA NA <br /> 7/5/88 <0.5 <0.5 NA <0.5 NA <br /> 3/19/92 <0.3 <0,3 NA <br /> <0.3 <0.5 <10 NA <br /> 8130/94 <0.5 <0.5 <0.5 <0.5 <50 NA <br /> AL-2 <br /> 4/27/87 <0.5 <0.5 NA <0.5 <I000 g <br /> 12/21/87 <0.5 <0.5 NA <0.5 NA NA <br /> 7/5/88 <0.5 <0.5 NA <0.5 NA NA <br /> 4114192 <0.3 <0.3 <0.3 <0.5 <10 NA <br /> 8/30194 <0.5 <0.5 <0.5 <0.5 <50 NA <br /> AL-4 <br /> 4127/87 <0.5 <0.5 NA <0.5 <1000 <1 <br /> 12/21/87 <0.5 <0.5 NA <0.5 NA NA <br /> 715188 <0.5 <0.5 NA <0.5 NA NA <br /> 3119/92 <0.3 <0.3 <0.3 <0.5 <10 NA <br /> 81'30/94 <0.5 <0.5 <0.5 <0.5 <50 NA <br /> HP-1 <br /> 3/19/92 <0.3 <0.3 <0.3 <0.5 <10 NA <br /> HP-2 <br /> 3/19/92 <0.3 <0.3 <0.3 <0.5 <10(c) NA <br /> (a)Total petroleum hydrocarbons(TPH): measured TPH in the C6 to C30 range(microextraction)for 1987 samples. <br /> Measured TPH in the diesel range(C10 to C22)(5030 extraction)for the 1992 samples. <br /> (b)NA means not analyzed. <br /> (c)Low levels of hydrocarbons in the diesel range were detected,but they were noted as not being diesel fuel. <br /> Laboratory personnel indicated that these hydrocarbons are the result of laboratory cross-contamination <br /> or most likely,naturally occurring organic material in the sample. <br />