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Sutter Street The holding tank is used to store purge water collected from monitoring wells MW-3A,MW-4, <br /> MW-5,MW-6, MW-7, and MW-9 The sample was analyzed by EPA Method 8015B/8021B for BTEX, <br /> TPH-g, methyl tertiary butyl ether(MTBE), di-isopropyl ether(RIPE), ethyl tertiary butyl ether(ETBE), <br /> tertiary amyl methyl ether(TAME),and tertiary butyl alcohol(TBA) The sample was collected man effort <br /> to characterize monitoring well purge water contained in the holding tank for future discharge to the sanitary <br />' sewer <br />' 3.0 MONITORING RESULTS SUMMARY <br /> 3.1 Groundwater Physical Characteristics and Potentiometric Surface Elevations <br />' Table 3-1 presents a summary of groundwater parameters, depths and elevations Compared to prior <br /> groundwater elevations, water levels have decreased by an average of 0 49 feet since September 2004 <br />' Table 3-1 <br /> Groundwater Parameter,Depth, and Elevation Data <br /> San Joaquin County Human Services Agency <br />' December 2004 <br />' Top of <br /> Average Average Casing Depth to December 2004 <br /> Temp. Average Conductivity Elevation Water Water Elevation <br /> Well °C H mS/cm) (feet MSL feet feet MSL <br /> MW-2 198 685 161 NM 3256 NM <br />' MW-2A 190 698 164 1191 3255 -2064 <br /> MW-3A 178 683 1 70 1123 3193 -2070 <br /> MW-4 179 740 107 1346 33 22 -1976 <br />' MW-5 201 706 070 1283 3128 -1845 <br /> MW-6 201 651 135 13 17 3250 -1933 <br />' MW-7 193 705 128 13 14 3425 -21 I1 <br /> MW-8 NM NM NM 1376 1 3474 1 -2098 <br /> MW-9 159 675 207 1226 3292 -20 66 <br /> °C=degrees Celsius <br /> mSlcnr—microsiemens per centimeter <br /> MSL=mean sea level <br />' NM=not measured <br /> A potentlometric contour map developed from the water level data is presented in Figure 3-1 As in previous <br />' sampling rounds, the water table is characterized by a northeast-southwest trending trough Groundwater <br /> flow is toward the center of the trough at a gradient of 0 008 feet/foot <br />' 3 2 Analytical Results <br /> A summary of the analytical data for the December 16 and 17, 2004 groundwater sampling is presented in <br /> Table 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 />' 3 <br />