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s I Q Is the MTBE being volatilized from the well9 This is highly unlikely, although experiments are being planned to account for this For the moment, one must realize that MTBE does not readily strip and that the release of oxygen from ORC is not forceful like air sparging. If MTBE were being stripped from a well volume, that stripped groundwater would experience the previously mentioned dilution in sampling In addition, the results in Figure 4, which were derived from a downgradient monitoring point, provide good initial evidence that that MTBE is not being stripped Q. Is the MTBE moving through the well zone over time and only appear to be degrading? A The fact we have seen the same pattern in multiple wells makes this explanation unlikely Also, if the rates of MTBE degradation were as dramatic as illustrated in Figures 1-4, then MTBE plumes would become infinitely diluted in short period of time which obviously is not the case. In conclusion, it appears that MTBE is biodegradable and the application of ORC may be an approach to enhance the bioremediation of MTBE. Given the fact that an MTBE plume will move farther downgradient than the more highly retarded BTEX components, barriers of different configurations are likely required. A tight series of direct push injections to form an ORC "slurry wall," in combination with the use of MTBE degrading microorganisms, will soon be the subject of an investigation by a major oil company. Oxygen barriers using ORC filter socks in wells are also a reasonable approach to cutting off the leading edge of an MTBE plume. Otherwise, standard direct push injections in the core of the plume will address the problem at the source. REGENESiS � Bioremediation Products 27130A Paseo Espada, Ste 1407, San Juan Capistrano, CA 82675 Phone 714-443-3136 Fax 714-443-3140 4M97 7 �