The Delbarton Coal Company required an impoundment de- sign that over its life would hold an estimated 23,359,541 Cubic Yards of Slurry. CBC Engineers & Associates, Ltd. submitted an im- poundment design that would be built in 7 stages (including the start- er dam) over the estimated impoundment life of 26 years. This design required staged construction to raise the impoundment some 460 vertical feet to meet the storage requirement. This impo

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