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<br />• analysis of stress redistribution associated with solution mining of cylindrical <br />cavities with diameters of 100 and 125 ft, <br />• evaluarion of the extent of long-term roof fallout to es[ablish a stable cavem <br />geometry, and <br />• review of p:illaz loads and strengths. <br />The design criteria provided by NMI requite that: <br />• The extent of the zone developed over the cavem due to long-term collapse be <br />limited to 200 ft in height. This will provide approximately 100 ft of undisturbed <br />rock above the collapse zone to ensure no risk of disturbing the oil shale resottrce <br />of the Mahogany zone and the ground conditions above the base of the B-Groove. <br />• The immediate roof be stable during dissolution operations. This is requited to <br />contain the dissolving fluid and maintain the integrity of the production tubing. <br />• <br />r. <br />The pillazs between cavities be stable to .r,; nimi~e disturbance of the overlying strata <br />and the pote:ndal for any surface subsidence. <br />1.2 SCOPE <br />This report presents the conclusions of the study and technical backup data. The summary <br />and conclusions are presented in Section 2.0; design parameters summarized in Section 3.0, and <br />Section 4.0, the results of our analysis and evaluations. In Section 4.0, fora questions aze <br />addressed: <br />• the maximum span for a cylindrical cavity with dissolution of the Boles Bed above <br />the OSMB, <br />• the extent of roof fallout to establish a stable opening, <br />• the influena~ of cavem length on stability, and <br />• evaluation of pillar stability. <br />• <br />J. F. T. Agapito & Associates, Inc. <br /> <br />2 <br />