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1 � l <br /> 3.0 MONITORING RESULTS SUMMARY <br /> ' 3.1 GROUNDWATER PHYSICAL CHARACTERISTICS AND POTENTIOMETRIC <br /> SURFACE ELEVATIONS <br /> ' Table 3-1 presents a summary of groundwater parameters, depths and elevations Since groundwater <br /> elevations were last taken in March 2004, groundwater elevations have decreased by an average of 0 49 <br /> ft <br /> Table 3-1 <br /> Groundwater Parameter, Depth, and Elevation Data <br /> ' San Joaquin Human Services Agency <br /> June 2004 <br /> ' Top of Casing Depth to June 2004 Water <br /> Temp. Conductivity Elevation Water Elevation (ft <br /> ' Well (1,C) pH ( MHOS) (ft MSL) (ft) MSL) <br /> MW-2 235 697 186 NM 3091 NM <br />' MW-2A 230 696 180 1191 3102 -19 11 <br /> MW-3A 192 7 12 214 1123 3034 -1902 <br /> MW-4 230 712 126 1146 31110 -1134 <br /> MW-5 NM NM NM 1283 2992 -1709 <br /> MW-6 121 664 161 13 17 3097 -1780 <br />' MW-7 222 722 164 1314 3270 -1956 <br /> MW-8 NM NM NM 1376 3328 -1952 <br />' MW-9 239 695 249 1226 3140 1 -1914 <br /> NM Not measured <br /> A potentiometrlc contour map developed from the water level data is presented as Figure 3-1 As in previous <br />' sampling rounds the water table is characterized by a northeast-southwest trending trough Groundwater flow <br /> is toward the center of the trough at a gradient of 0 0112 ft/ft <br />' 3.2 ANALYTICAL RESULTS <br /> A summary of the analytical data for the June 2004 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 were detected in samples collected from MW-2 and MW-2A Low levels of <br /> Benzene, ethylbenzene, toluene, and total xylene were detected in MW-2 and MW-2A <br />' TPH-g and BTEX compounds were not detected in MW-9 Benzene and toluene were detected in the <br /> equipment blank water sample This detection is likely due to cross contamination <br />' L\PR0IECTS\SAN]0QURSA\2Q04Rn"D 3 <br />