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Monitoring wells were installed upgradient and downgradient of the <br /> oxidative curtain. Monitoring wells 9 AIB (shallow/deep) were installed 15 ft <br /> (4 6 m)upgradieM and 17 AIB (shallow/deep)were installed be00tween 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 omdizing 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 /> downgradient well dropped to non-detect <br /> r. <br /> CL <br /> UPGRADIENT <br /> O s �•�• q • <br /> H 1 <br />. W 4I • �•� <br /> U 1 DOWNGRADIENT <br /> W 2 - 1 (MW-17A) <br /> m a <br /> � b <br /> 0 ` NO <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 microspargwg as effectively <br />. as BTEX Bench-scale tests showed this to be true Feld tests proved the <br /> usefulness for both point source treatment and bubble fence treatment MTBE <br /> b <br />