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<br />Preliminary Adequacy Review 2 December 6, 1985 <br />underdrain's capacity to expel water near the toe of the fill could result in <br />troublesome instability for the final graded facial slope. For this reason, <br />the Division believes it would be prudent to require Peabody to mechanically <br />segregate coarse material for placement in that portion of the underdrain to <br />be constructed within 100 feet of the final facial slope. The Division <br />requires this final segment of the underdrain be constructed with durable rock <br />prior to the dragline placement of spoil in this final segment of the fill. <br />