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rt <br /> A potentiometric contour map developed from the water level data is presented on Figure 3-A. As in previous l <br /> sampling rounds groundwater flow is generally toward the north-northeast within,a trough. The horizontal <br /> groundwater gradient down the center of the trough was 0.002 ft/ft. <br /> i <br /> 3.2 ANALYTICAL RESULTS <br /> A summary of the analytical data for the October 2001 groundwater sampling is presented in Table 3-2. <br /> Historical groundwater analytical results are presented in Table A-1 in Appendix A. The analytical reports <br /> and Chain of Custody forms are presented in Appendix C. <br /> Petroleum hydrocarbons,benzene,toluene,ethylbenzene,and total xylenes(BTEX)were detected in samples t <br /> collected from MW-2 and MW-2A. Petroleum hydrocarbons and BTEX compounds were not detected in <br /> samples collected at MW-9,the holding tank, or the equipment blank. <br /> d <br /> Table 3-2 <br /> Organic Analytical Results <br /> San Joaquin County Human Services Agency N <br /> November 2001 <br />— � Well Groundwater Benzene Toluene Etylbenzne Total Xylene TPH-G <br /> Elevation (µg/L) (yg/L) (yg/L) (ag/L) Gug/L) <br /> (feet) <br /> MW-2 NM 10,000 220 1,300 2,700 26,000 <br /> MW-2A -15.35 40 ND(0.5) 43 ND(0.5) 1,000 <br />_ <br /> MW-9 -15.39 ND(0.5) ND(0.5) ND (0.5) ND(0.5) ND (50) <br /> H-TANK N/A ND(0.5) ND(0.5) ND(0.5) ND(0.5) ND (50) <br /> EB-1 N/A ND 0.5 ND(0.5) ND 0.5 ND 0.5 ND 50 <br /> Notes: ND(0.5) = Analyte not detected, detection limit indicated in parentheses. <br /> NM = Not measured. <br /> N/A = Not applicable F <br /> (µg/L) = parts per billion <br /> 4.0 CONCLUSIONS <br /> Concentrations of petroleum hydrocarbons in source area well MW-2 decreased and slightly increased in <br /> source area well MW-2A since the last sampling (May 2001). Benzene and ethylbenzene concentrations !' <br /> decreased in MW-2 and slightly increased or remained the same in MW-2A. Toluene and total xylene-2 d <br /> were detected in MW-2; however concentrations were not detected in MW-2A.No contaminants of concern <br /> L1PRD1ECTMSAA'JDQVISAI IQO1 RPT.WPD 4 <br /> 1 <br />