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10/12/1938 16:09 9155358207 APEX ENVIROTECH rout r <br /> Q. Is the MTSE moving through the well zone over time and only appear to <br /> be degrading? <br /> A. The fact we have seen the same pattern in multiple wells makes this <br /> explanation unlikely. Also, if the rates of MTBE degradation were as <br /> dramatic as illustrated in Figures 1-4, then MTBE plumes would become <br /> infinitely diluted in short period of time which obviously is not the case. <br /> In concluslon, It appears that MTBE is biodegradable and the application of ORC may be an approach <br /> to enhance the bioremediation of MTBE. Given the fact than an MTBE plume will move farther <br /> downgradient than the more highly retarded BTEX components, barriers of different configurations <br /> are likely required. A tight series of direct push injections to form an ORC "slung wail," in <br /> combination with the use of MTBE degrading microorganisms, will soon be the subject of an <br /> investigation by a major oil company. Oxygen barriers using ORC Filter socks in wells are also a <br /> reasonable approach to cutting off the leading edge of an MTBE plume. Otherwise, standard direct <br /> push injections In the core of the plume will address the problem at the source. <br /> Figure 4 <br /> Source Treatment In scansin <br /> DOWngradi-en t Rieductio -STEK f MTBE <br /> 45000 �OpQ <br /> . pTk-WMARW <br /> 12DOU -- -------- --------------- ISM `� <br /> m <br /> WIN -- - ------------_-- ---- - 12©0 e <br /> 6000 -__--- -- -- - - ------ 8pp <br /> CL a. <br /> CL 3000 -- ---- - --------�-- A-- 400. <br /> 10`Rem WUFw FWd a <br /> 0 20 40 $0 8 JOB 120 140 <br /> DAYS <br /> Technical_ Bulletin Indexll�e is Hgr2„Daae <br />