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(6 m) below grade The upgradtent breadth of the plume was estimated to be <br /> about 50 ft (15 2 m) <br /> After careful study of optimal placement, an oxidative curtain was <br /> installed at right angles to the advancing plume front to intercept and contain the <br /> MTBE A bubble fence composed of 4 dual-level Spargepoints® fed by a Madel <br /> 3600 C-Sparge"' unit was installed The Spargepoints®were installed about 13 <br /> ' ft (4 m) on center in a line about 40 ft(12 2 m) long, 100 ft(30 5 m) upgradient <br /> of the water supply well Two levels of Spargepoints® were installed, one at <br /> ' between 21 ft and 24 ft (6 4 m and 7 3 m)below grade, and another at between 36 <br /> ft and 39 ft (11 in and 119 m)below grade <br /> i o,o0a <br /> \� e��vrFti <br /> Fid <br /> FN <br /> ' \ O FS 0 <br /> ¢ 1000 A, <br /> 7 days <br /> O <br /> ❑ <br /> a + + <br /> F <br /> Z <br /> W tia= S days <br /> T <br /> ZO 100 O �� + <br /> ' U d <br /> ' 10 <br /> BENZENE O O <br /> ' TOLUENE a 1. <br /> ETHYLBENZENE + <br /> XYLENES 0 <br /> MTBE o <br /> 1 <br /> JULY AUG AUG AUG AUG <br /> ' 30 5 io is 20 <br /> DATE <br /> ' FIGURE 3. Removal of MTBE and BTEX compounds during C-SpargeTM <br /> . oxidation of ground water at a service station. <br /> 1 <br />