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<br />' disposal area. It will be placed immediately after the <br />' construction of this drift, and prior to the initiation of <br />hydraulic mining. It will be buried in a 3 foot by 3 foot <br />trench in the floor of the drift, and the trench will be <br />t filled with 1" gravel. The discharge end of the pipe will be <br />protected by cribbing, so that it will remain operational <br />' after the completion of hydraulic mining in the disposal area. <br />This arrangement is illustrated in Figure 4. <br />' 3.2.2 The water removal system <br />The water removal system will comprise a four inch smooth walled <br />' pipe (Sclair or equivalent) laid in the intake air drift of the <br />under main entry to the disposal area facility. Return flow to the <br />' system will be by gravity drainage. The drain line will be routed <br />through the intake air entry in a 2 foot by 2 foot floor cut; this <br />' cut will join the delivery system and both pipes will occupy the <br />same cut from that point to the surface facility. <br />' 3.2.3 Bulkheadina <br />' Following mining of the disposal area, but prior to initiating <br />disposal, the entries to the disposal area will be bulkheaded <br />' through the barrier pillar. This bulkhead will comprise poured <br />concrete plugs, for the full length of the pillar (120 feet). The <br />' bulkheads will be keyed into the coal by 1 foot deep keyways, to <br />enhance the seal of the bulkheads, and to ensure that there is <br />adequate shear resistance in the bulkhead to withstand the expected <br />pressure of the fill. <br />' The gravel fill around the pipes will be excavated, and replaced <br />with concrete. <br />' Adrian Brown Consultants -15- 1145/900820 <br />1 <br />