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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 /> Sparsins Well SWI <br /> Observation <br /> Well Temperature DO DO pH Conductivity ORP <br /> Number Date/Time °C) % (mg/1) S/cm) (mV Remarks <br /> V2 9/8/2004 1050 2175 95 085 653 898 -156 Prior to sparging <br /> 9/8/2004 1408 2230 100 086 6 15 895 +123 During sparging <br /> 9/8/2004 1410 22 13 83 073 624 896 +93 During sparging <br /> 9/8/2004 1417 2226 60 052 653 897 -96 During sparging <br /> UVB-MWI 9/8/2004 1120 2109 90 078 656 1041 -311 Prior to sparging <br /> 9/8/2004 14 15 2448 140 196 663 1053 -288 During sparging <br /> 9/8/2004 14 30 2398 58 052 663 1053 -250 During sparging <br /> i <br /> Sparging Well UVB-MWl <br /> Observation <br /> Well Temperature DO DO pH Conductivity ORP <br /> Number Date/Time °C) % (mg/1) (PS/cm) mV Remarks <br /> V2 9/8/2004 10 50 2175 95 085 653 898 -156 Prior to sparging <br /> 9/8/2004 14 50 2132 53 046 664 897 -105 During sparging <br /> V 1 9/8/2004 10 55 2297 95 081 653 899 -288 Prior to sparging <br /> 9/8/2004 16 05 2230 69 061 670 899 -141 During sparging <br /> G TrojeotsI73942VNASTER\WPWR09041P11m Test Data(8 Sept 2004) Page I of 2 <br />