Enclosed are 10 copies of the subject report for your information. These two volumes summarize the technical accomplishments, through September 1997, and status of the treatability study canied out on seepage Pit 1 to establish the field-scale technical perfomance of in situ vitrification (ISV).On April 21, 1996, a melt expulsion occurred during ISV operations. As a result of phis expulsion, the ISV demonstration was reviewed in detail and a decision was made not to Continue w i t h ISV activities at Pit 1, even though the isolation of contaminants was succcssfd up to the time of the melt expulsion. The Oecisim to tmiixite Pit 1 activities was based on the fact that w i t h the high watertable and underlying bedrock conditions at the Pit 1 site, there was no way of assuring that a melt expulsion would not occuf during the rest of the planned ISV treatability activities.These volumes were developed to provide the data, information, lessons leamed, and details necessary to continue evaluation of ISV as an alternative technology for remedial action at appropriate locations.. If you have any questions or need additional infomation, please call Dr. Jeny Kuhaida at 576-5506.

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