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Description:"The U.S. Bureau of Mines conducted research to determine the effect of ground water control on the dewatering of phosphatic clay wastes. Two storage impoundments were constructed. One impoundment was surrounded on three sides with a series of well points (shallow vertical wells) to lower the ambient water table, and the second impoundment served as a control. Ground water was pumped from the area surrounding the test impoundment for a period of 490 days. A constant pumping rate of 60 gal/min resulted in a water table drawdown of 13 ft, approximating the bottom of the impoundment. At the end of the test period percent solids in the test impoundment was 35 pct, while in the control impoundment percent solids was only 26.8 pct. percent solids of greater than 30 pct is required for capping and final reclamation using fertile overburden." - NIOSHTIC-2
NIOSHTIC no. 10007341
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Pages in Document:11 numbered pages
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NIOSHTIC Number:nn:10007341
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