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• Table 3-2 <br /> Organic Analytical Results <br />' San Joaquin County Human Services Agency <br /> 1 and 2 November 2000 <br />' Groundwater Ethyl- Total <br /> Elevation Benzene Toluene benzene Xylene TPH-G <br />' Well feet /L /L /L /L /L <br /> MW-2 NM 18,500 286 3,070 5,950 57,300 <br /> MW-2A -1552 379 ND 5 0 163 ND 15 0 3,130 <br /> MW-2A du -15 52 26 0 ND 5 0 142 ND 15 0 2,700 <br /> MW-3A -15 63 ND 0 5 ND 0 5 ND 0 5 ND 1 5 336 <br /> MW-4 -14 99 ND 0 5 ND 0 5 ND 0 5 ND 1 5 ND 50 <br />' MW-5 -13 45 ND 0 S ND 0 5 ND 0 5 ND 1 5 ND 50 <br /> MW-6 -14 10 ND 0 5 ND 0 5 ND 0 5 ND 1 5 83 9 <br /> MW-7 -15 89 0 684 ND 0 5 ND 0 S ND 1 5 189 <br /> MW-9 -15 56 ND 0 5 ND 0 S ND 0 5 ND 1 5 72 2 <br /> Notes ND (0 5) = Analyte not detected, detection linut indicated to parentheses <br /> NM = Not measured <br /> NA = Sample was not analyzed for this constituent <br /> 1 <br /> 4.0 CONCLUSIONS <br />' Concentrations of petroleum hydrocarbons increased in source area wells MW-2 and MW-2A. <br /> Benzene was detected in MW-7 at concentrations slightly below the concentrations detected in <br /> MW-7 in the second quarter 2000 Benzene was not detected in MW-6 as it was in the second <br /> quarter 2000 Petroleum hydrocarbons were detected in upgradient well MW-9 for the first time <br /> tPossible interpretations for this include upgradient contaminant migration through dispersion, <br /> contamination pulled into the well during purging and sampling, contaminated laboratory <br />' glassware and/or instruments, and another contaminant plume from an upgradient source <br /> beginning to enter the HSA site These possibilities will be further evaluated during future <br />' monitoring events Groundwater flows into a trough and then to the northeast with a horizontal <br /> gradient of 0 0018 ft/ft <br /> I <br /> I <br /> NCASha„adTR0IECTWAN]0QWAI4QWRPI'wPD 6 <br />