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Monitoring wells were installed upgradient and downgradient of the <br /> oxidative curtain Monitonng wells 9 AIB (shallow/deep) were installed 15 It <br /> ' (4 6 m) upgradient, and 17 AIB (shallow/deep) were installed be0otween 15 ft and <br /> 20 ft (4 6 m and 6 m) downgradient Figure 4 shows the results of the MTBE <br /> concentration change across the oxidizing zone A level of up to 6 ppb was found <br /> ' with the advancing front The level measured in the upgradient monitoring well <br /> did decrease somewhat with time, probably because it fell within the normal 20 ft <br /> (6 m) radius of influence of the spargewells The MTBE content in the <br /> tdowngradient well dropped to non-detect <br /> -0 8 <br /> CL <br /> UPGRADIENT <br /> Z •�;h'9 • <br /> O 6 a�•/ 9l <br /> Z i <br /> ;v; 4 i • �•� <br /> I �. • <br /> Z E <br /> O <br /> U I DOWNGRADIENT <br /> ' W 2 I (MW-17A) <br /> a3 I <br /> F— b <br /> � b <br /> ' ND <br /> 0 <br /> 0 2 4 6 8 10 12 <br /> ' TIME (WEEKS) <br /> FIGURE 4. MTBE reduction across oxidative curtain <br /> ' CONCLUSIONS <br /> The combination of fine bubbles, which increases the amount of stripping <br /> into the bubbles, and ozone decomposition of the constituents results in rapid <br /> ' removal of MTBE from contaminated groundwater The knowledge that both <br /> BTEX and MTBE lie in similar partitioning regions, where volatile compounds <br /> move from aqueous to gaseous phases with reasonable water solubility, led to the <br /> assumption that MTBE could be treated with ozone microsparging as effectively <br /> as BTEX Bench-scale tests showed this to be true Field tests proved the <br /> usefulness for both point source treatment and bubble fence treatment MTBE <br /> 1 <br />