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3.2 ANALYTICAL RESULTS <br /> A summary of the analytical data for the December 1998 groundwater sampling 1s presented in <br /> Table 3-2. Historical groundwater analytical results are presented in Table A-1 in Appendix A. <br /> The analytical reports and Chain of Custody forms are presented in Appendix C <br /> Petroleum hydrocarbons were detected in samples collected from MW-2A, MW-3, and MW-6 <br /> No petroleum hydrocarbons were detected in MW-4, MW-7, or MW-9. With the exception of <br /> TPH-G and total xylene detected in MW-2A, analyte concentrations decreased or were below <br /> detection limits In MW-2A, total xylene increased from 61 µg/L and TPH-G increased from <br /> 6,000 µg/L to 7,200 µg/L The concentration of benzene in MW-2A continued to decrease. <br /> Table 3-2 <br /> Organic Analytical Results <br /> San Joaquin County Human Services Agency <br /> 9 and 10 December 1998 <br /> • Groundwater Ethyl- <br /> Elevation Benzene Toluene benzene Total Xylene TPH-G <br /> Well (feet) (Ug/L) (AgIL) (µg/L) (µg/L) (µg/L) <br /> MW-2A -1625 610 71 530 330 7,200 <br /> MW-3A -16 43 1 1 ND (0 5) ND (0 5) ND (0 5) 75 <br /> MW-4 -1546 ND (0 5) ND (0 5) ND (0 5) ND (0 5) ND (50) <br /> MW-6 -14 88 ND (0 5) ND (0 5) ND (0 5) 1 3 52 <br /> MW-7 -1657 ND (0 5) ND (0 5) ND (0 5) ND (0 5) ND (50) <br /> MW-9 -1621 ND (0 5) 1 ND (0 5) ND (0 5) ND (50) ND (50) <br /> Notes ND (0 5) = Analyte not detected, detection limd indicated in parentheses <br /> I <br /> I - O <br /> L\P1t0jE rSSSANJOQW5A\HSA"JAN 7 Jamory 19" <br />