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This report provides method, materials evaluations and engineering for managing wastes hazardous to man and other life by localization employing an organic, polymeric cementing and encapsulating process (TRW process). Specimens, of cubic dimensions three inches on edge, of wastes cemented with 3 to 4% by weight polybutadiene binder and encapsulated by 1/4 inch polyethylene jackets, were fabricated with selected wastes and subjected to exacting leaching conditions and mechanical testing. They were found to exhibit excellent retention of contaminants in leaching by a broad spectrum of aqueous solutions and to withstand degradation under high compressive and impact mechanical forces.