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r � 04 March 1996 " v , AGE-NC Project No 95-0144 Page 5 of 18 ' Data collected during the IAS pilot test is summarized on Table 2 42 RESULTS OF IN-SITU AIR SPARGING PILOT TEST 4 2 1 INDUCED PRESSURE Y h y Pressure measured in surrounding monitoring wells showed an initial increase However, measured pressure decreased over time The cause of the decrease, albeif minor, could not.be explained The . decrease in measured pressure may be due to channeling of air flow from the sparging points A explained, injection pressure and flow rate may help prevent channeling of air flow Surging of the sparging ' system by starting and stopping the compressor may also induce more favorable air flow characteristics 4 2 2 DISSOLVED OXYGEN �} Initially, dissolved oxygen increased in all observations wells except MW-5 However', dissolved oxygen concentrations unexpectedly decreased over the duration of the sparging test in all observation wells except MW-1 S The overall decrease of dissolved oxygen in wells nearest the ' sparging points (MW-1, MW-4, MW-5) may be caused by channeling of the air flow from the sparging points A lower flow rate or surging of the air source may reduce channeling at the site 4 2 3 ORGANIC VAPORS The highe .-eerrc ntration of organic vapors were detected in MW-1, ranging fro 31 m upon initiate 45, pe 68-hours The greatest concentrations measured in all other wells ranged ' m 2 0 ppm It -18 to 73 p i (MW-4) u ' 4 2 4 GROUND WATER DEPT J Duringthe IAS pilot tes , an ation increase of approximately 0�3feet in ground water in wells MW-1, MW-4 and MW-5 a -noted, indicating gro nn water mounding No significant mounding was measured in wells MW-2 or MW-18 4 4 2 5 LABORATORY RESULTS OF GROUND WATER SAMPLES Three water samples collected on 30 January 1996 were analyzed for dissolved iron Iron was