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1 <br /> l W--' <br /> ie <br /> 3.2 ANALYTICAL RESULTS <br /> A summary of the analytical data for the August 1999 groundwater sampling is presented 1n Table <br /> 3-2 Historical groundwater analytical results are presented in Table A-1 in Appendix A. The <br /> analytical reports and Chain of Custody forms are presented in Appendix C. <br /> Petroleum hydrocarbons were only detected in samples collected from MW-2A. Petroleum <br /> hydrocarbons were not detected in MW-9. The concentration of total petroleum hydrocarbons <br /> (6,500µg/L) detected in the sample from MW-2A decreased from the May 1999 sampling event <br /> 1 The concentration of benzene (180 ,ug/L) and total xylenes (200 µg/L) also decreased <br /> significantly Toluene and ethylbenzene were not detected this quarter. Duplicate sample results <br /> were similar to the primary sample results <br />' Table 3-2 <br /> t• Organic Analytical Results <br /> San Joaquin County Human Services Agency <br /> 10 August 1999 <br /> Groundwater Ethyl- <br /> Elevation Benzene Toluene benzene Total Xylene TPH-G MTBE <br />' Well feet IL /I /L /L '/L) <br /> L /L <br /> MW-2A -15 17 180 ND 50 ND (522 200 6,500 ND 250 <br />' MW-2A -15 17 210 ND (50) ND (50) 230 6,400 ND (250) <br /> (dup) <br />' MW-9 -1520 ND ND (0 5) ND (0 5) ND (50) ND (50) ND (2 5) <br /> __(2S <br />' Notes ND (0 5) = Analyte not detected, detection hinit mdicated in parentheses <br /> I <br />' L+PROJE(7rSISANJ0QWSAWSA_99 SEP 5 &TWW6er 1999 <br />