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<br />' computed factor of safety against failure of the barrier pillar is <br />' 4.4, taking these worst case conditions. <br />' 3.2 THE DISPOSAL SYSTEM <br />' The disposal system uses a slurry transport and deposition <br />~ strategy. The components of the system are discussed below. <br />' 3.2.1 The slurry delivery system <br />' The slurry delivery system comprises the following components: <br />' 1. Slurry plant. This plant will accept the solid material to be <br />disposed, crush the oversize material into 3/4 inch minus size <br />' range, and mix the resulting material with water from the <br />hydraulic system. The resulting liquid will be designed to be <br />' a dilute slurry, with an average density of 2 pounds of solids <br />per gallon of water (about a 25$ slurry density). This slurry <br />will be fed into a centrifugal slurry pump, and will leave the <br />pump station at about 300 psi pressure. <br />' 2. The delivery pipes. The delivery piping system will comprise <br />a single 4 inch diameter smooth wall pipe (Sclair pipe or <br />' equivalent). This pipe will run from the surface facility to <br />the underground disposal area via the return air tunnel and <br />' drift system. Emergency draincocks will be located at the <br />surface facility, and at each 1,000 feet of length; these will <br />drain into the flume within the mine, and the emergency slurry <br />' overflow ditch at the surface facility. <br />' 3. The discharge system. The delivery pipe will be routed <br />through the intake air main drift of the lower drift of the <br />' Adrian Hrown Consultants -14- 1145/900820 <br /> <br />