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� fj• � <br /> r <br /> 6 <br /> (6 m) below grade The upgradient breadth of the plume was estimated to be <br /> about 50 ft(15.2 m) <br /> After careful study of optimal placement, an oxidat've curtam w" <br /> installed at nght angles to the advancing plume front to intercept and cont=the <br /> fed by a Madel <br /> NfTBE. A bubble fence composed of 4 dual-level Spargepol <br /> 3600 C-Sparge w unit was installed. The Spargepoints®were installed about 13 <br /> ft(4 m) on center m a line about 40 ft(12.2 m) long, 100 ft(30.5 m) upgradient <br /> of the water supply well Two levels of Spargcpoints® were installed, <br /> one between 21 ft and 24 ft(6.4 m and 7 3 m)below grade, and another at ween 36 <br /> ft and 39 ft(11 m and 119 m)below grade <br /> 1 0,000 <br /> �B <br /> .o eFti� <br /> ti <br /> i <br /> CL 1,000 rO`GF O tin a 7 days <br /> O <br /> �13 <br /> Z t„j R 5 days <br /> 100 Off` + <br /> V G D <br /> 10 <br /> BENZENE O O\ <br /> TOLUENE o <br /> E1101-BENZENE <br /> XYLEMES O <br /> MUE O <br /> JULY AUG AUG AUG AUG <br /> 13 20 <br /> 30 5 10 <br /> DATE <br /> FIGURE I Removal of MTBE and BTEX compounds during C-Sparge'w <br /> oxidation of ground water at a service station- <br />