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TABLE 7 AIR SPARGING PILOT TEST DATA DURING AND AFTER THE AIR SPARGING PILOT TEST <br /> FORMER EXXON RETAIL SITE 7-3942 <br /> 4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> SparginE Wells SWI or UVB-MW1 Observations may be the result ofthe s ar in of either well <br /> Observation <br /> Well Temperature DO DO pH Conductivity ORP <br /> Number Date/Time °C) % (Mg/1 S/cm mV Remarks <br /> V3 9/8/2004 1230 2082 67 059 694 824 -375 Prior to spargmg test <br /> 9/8/2004 1252 2048 64 058 683 838 -390 Prior to spargmg test <br /> 9/8/2004 16 40 2242 60 050 698 832 -184 After spargmg test <br /> UVB-MW 1 9/8/2004 11 20 2109 90 078 656 1041 -311 Prior to sparg>ng test <br /> 9/8/2004 16 15 2887 41 1 321 654 1052 -116 After spargmg test <br /> 9/8/2004 16 17 2471 325 269 651 1005 +1 14 After spargmg test <br /> °C degrees Celsius <br /> mg/1 milligrams/]iter <br /> µS/cm microSiemens/centimeter <br /> mV millivolts <br /> DO Dissolved Oxygen <br /> PH potential of Hydrogen <br /> ORP Oxidation Reduction Potential <br /> G Tro)ects%73942NASTER%W MSR0904Tjlot Test Data(8 Sept 2064) Page 2 of 2 <br />