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1 <br /> �e <br /> wuNceRS CE94MFP5 CPti5Ll,AvrS <br /> 3.2 ANALYTICAL RESULTS <br />' A summary of the analytical data for the December 1997 groundwater sampling are presented <br /> In Table 3-2. Historical groundwater analytical results are presented in Table A-2 in Appendix <br /> A. The analytical reports and Chain of Custody forms are presented in Appendix C. <br /> Petroleum hydrocarbons were detected in samples collected from MW-2, MW-2A, MW-7, and <br /> MW-8 The MW-2 sample had the highest concentrations of dissolved petroleum hydrocarbons; <br /> benzene (1,500µg/L), toluene (17µg/L), ethylbenzene (1,100µg/L), xylenes (1,000µg/L), and <br /> tTPH-G (9,100µg/L) were detected. In MW-2A, which showed a large decrease in contaminant <br /> concentrations since the previous sampling event, benzene (200 µg/L), toluene (14 µg/L), <br /> ethylbenzene (160 µg/L), xylenes (50 µg/L), and TPH-G (1,400 µg/L) were detected. Benzene <br /> was detected in groundwater samples collected from MW-7 and MW-8, at 0 5 µglL and 0 6 <br /> jig/L, respectively TPH-G was detected in MW-8 at 600 µg/L, however this well is located <br />' at another UST site Petroleum hydrocarbons were not detected in cross-gradient wells MW-3A, <br /> MW-4, MW-5, and MW-6 Petroleum hydrocarbons were also not detected in up-gradient well <br /> MW_9 <br /> Table 3-2 <br /> Organic Analytical Results <br /> San Joaquin County Human Services Agency <br /> 15 and 16 December 1997 <br /> Groundwater Ethyl- <br /> Elevation Benzene Toluene benzene Total Xylene TPH-G <br /> Well (feet) WIL) (µg/L) (peg/L) WIL) WIL) <br /> MW-2 NM 1,500 17 1,100 1,000 9,100 <br /> MW-2A -22 01 200 14 160 so 1,400 <br />' MW-3A -22 18 ND (0 5) ND (0 5) ND (0 5) ND (2) ND (50) <br /> MW-4 -21 22 ND (0 5) ND (0 5) ND (0 5) ND (2) ND (50) <br />' MW-5 -1950 ND (0 5) ND (0 5) ND (0 5) ND (2) ND (50) <br /> MW-6 -20 82 ND (0 5) ND (0 5) ND (0 5) ND (2) ND (50) <br /> MW-7 -22 44 0 5 ND (0 5) ND (0 5) ND (2) ND (50) <br /> MW-8 -22 17 0 6 ND (0 5) ND (0 5) ND (2) 600 <br /> MW-9 -22 11 ND (0 5) ND (0 5) ND (0-5) I —T <br /> ND (2) ND (50) <br /> Notes ND (0 5) = Analyte not detected, detection linut mdJcated in parentheses <br /> L IPR0JEC7SZAKJ0QkRSAV1SA 97 DEC f lWUULry 1999 <br /> 1 <br />