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<br />waste mass, dissolves soluble constituents of the waste and ether <br />percolates into the ground or runs off to surface drainage. he <br />volume of leachate generated depends on the characteristics o the <br />precipitation event, antecedent moisture conditions, the ability of <br />the waste to hold moisture and the evaporation of moisture f m the <br />waste following the precipitation event. The amount of Ovate which <br />percolates into a soil with vegetative cover can be calculat d from <br />a knowledge of the monthly precipitation, evapotranspiration and <br />soil moisture storage by using the water ba]ance method prop sed by <br />Thornwaite(I). In general, due to the low rainfall (I2 inch s/year) <br />and high potential evapotranspiration (greater than 30 inche /year) <br />in the Paradox Valley, no net infiltration occurs. <br />In considering the production of leachate from waste rock, o for to <br />reclamation, no transpiration due to plant respiration will ccur. <br />Rather, any return of water to the atmosphere wi?1 occur as vaporation <br />from the moisture-saturated waste rock. Analyses of bare so is have shown <br />that the evaporation rate is highest after initial saturatio and drops <br />off rapidly as the water content of tree soil decreases (P~ii;'p 2). <br />:nfiltration occurs wV~en the scil receives wate~ in excess o its <br />moisture-bearing capacity. This moisture-bearing capacity i a <br />function of the percent of fines in the soil, and of its co osition <br />l-lay, Sand, 1Gdm, etc.). ,t th2 nrgg _^`_ t'.IP~`..^? c .:.. ~7.. ...__._ <br />istics of the waste rock are not known, but a conservative stimate is <br />that 500 of the annual precipitation falling on the waster k would <br />percolate through the pile and become Teachate. After recl ation, <br />