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• r • t VRFNIOVAL hydraulic conductivities consistent with semi-confined conditions The presence of • microbubbles. Qas release. and dmssol+ed oxygen changes normally demark the expansion of the treatment zone. On April 1, operation of the C-SpargeTM unit began at about 2 00 Pmt By the afternoon of April 2, gas bubbles ,.,,ere found discharging at mmnn+ell 129, o+er 17 1 m (56 ft) from the sparge%N ell installation (TNV)(Table 2) Well D, only about 2 2 m (7 ft) from the infection area showed almost immediate oxygen changes and,.eater which effervesced with fine bubbles Ho%vever,the lateral spread from this long axis progressed slo++ly (+cells A and C), as if the wells were in tight(silty)material Tables 2 and 3 (Table 3 is at end of text) give the results of field measurements taken dunng sampling. Figure 4 shows the lateral spread during the ten-day test. Figure 5 depicts the vertical spread observed during the test penod. Table 2. Dissolved Oxygen (DO) Changes Observed in Monitoring Wells Near the Spargeweil. WELL DAY 1 2 3 4 5 6 7 8 9 10 11 TW 2.8 11.5 - D 12 14.2 12.2 119 89 -- 12.0 12 3 13•0 92 1 15 8 129 0.0 1.6 9.3 92 74 -- 79 86 91 C 0.0 0.7 14 09 1.1 -- 3.5 3.4 5.7 5.2 8.2 A 00 0.0 0.1 3.1 8.6 - 8.6 88 11.6 11.7 93 . B* ` 0 0 0.0 00 02 00 --- 0.0 00 0.0 0.0 0.0 126 (14 & 15) 00 0.0 0.0 3.5 37 --- 5.9 63 6.8 6.7 60 *Well B showed a continual increase in redox potential despite exlubiting no oxygen increase. A]iydrocarbon plume with high oxygen demand existed in the region. i a 1w A ' cc 10 r If • •x� ♦ �C �•rj � � rr r�r r�• •� rr� �� W { O 26 125 25m 0 Sts lye 2+0,aowe 0•y aon•un•o Figure 4 Site layout showing Figure 5 Vertical spread of • lateral spread of dissolved oxygen dissolved oxy gen during ten-day during ten-day test period,test well test (TW), and monitoring x+elis 5