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meet discharge permit requirements for discharge to the sanitary sewer As stated in the existing discharge <br /> permit application,pending laboratory analysis of the purge water from these two monitoring wells would <br /> determine appropnate disposal Purge water from monitonng well MW-2A will now be stored in the 500- <br /> gallon holding tank as descnbed below Purge water from monitoring well MW-2 will continue to be stored <br /> in a staged 55-gallon drum <br />' Purge water from the remaining monitoring wells(MW-3A,MW4,MW-5,MW-6,MW-7,MW-9,and now <br /> MW-2A) is held in a 500-gallon holding tank,also staged at the loading dock of the San Joaquin Human <br />' Services Agency building at 145 South Sutter Street Pending laboratory analysis by EPA Method 418 111664 <br /> for total petroleum hydrocarbons as oil and grease,and EPA Method 8260 for BTEX,methyl tertiary butyl <br /> ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETRE), tertiary amyl methyl ether <br />' (TAME),and tertiary butyl alcohol(TBA),the holding tank water is periodically discharged 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 increased by an average of 1 15 feet since March 2005 <br /> Table 3-1 <br /> 1b <br /> Groundwater Parameter, Depth, and Elevation Data <br /> San Joaquin County Human Services Agency <br /> June 2005 <br /> Top of <br />' Average Average Casing Depth to June 2005 <br /> Temp. Average Conductivity Elevation Water Water Elevation <br /> Well °C H mS/cm) (feet MSL feet feet MSL <br />' MW-2 247 661 1 79 NM 2986 NM <br /> MW-2A 229 674 1 46 1191 2981 -1790 <br />' MW-3A 23 0 704 154 1123 2924 -1801 <br /> MW-4 234 754 121 1346 3053 -1707 <br />' MW-5 NM NM NM 1283 2859 -1576 <br /> MW-6 25 0 675 130 13 17 2975 -1658 <br />' MW-7 220 7 11 1 24 13 14 1150 -1136 <br /> MW-8 NM NM NM 1376 31 95 -18 19 <br /> MW-9 22 1 688 208 1226 3016 -1790 <br /> °C=degrees Celsius <br /> mS/crr m ms,emens per centimeter <br /> MSL=mean sea level <br /> NM=not measured <br /> 3 <br />