During the course of the Phase I design work, several items have evolved as critical enough to merit formal evaluation and documentation through a trade-off study. Each trade-off study discusses the alternatives, significant background, selection process and conclusions on these areas of design. Critical Items Identification, resulted in a list of design elements essential to the success of the facility performance. Of these, a total of seven were selected for expanded discussion via a trade-off study. Brief summaries and conclusions are noted for each trade-off study: rectangular vs. circular retort module configuration; hydrogen sulfide removal from low-Btu product gas; naphtha recovery from low-Btu product gas; comparative mine access; upper bench load and haul; facing of processed shale embankment; and hazardous waste disposal.