Laserfiche WebLink
the establishment of vegetative cover will preclude the generation <br /> Cof leachate as evapotranspiration exceeds precipitation. <br /> Probable Leachate Characteristics <br /> Because no waste rock from the C-JD-8 Mine is yet available for <br /> testing, the actual characteristics of any leachates which might be <br /> generated are unknown. The characteristics of the leachate will be <br /> dependent on the characteristics of the waste rock and the precip- <br /> itation percolating through the rock. Attached are chemical analyses <br /> from a waste rock leachate for materials from the Uravan Mineral Belt. <br /> This analysis is from an EPA Draft document, "Evaluation of Management <br /> Practices for Mine Solid Waste Storage, Disposal and Treatment". <br /> Volume of Leachate Generated <br /> As discussed above, the maximum volume of leachate generated from the <br /> unreclaimed waste rock pile would be 50% of annual precipitation, or <br /> 6 inches. (Due to implementation of the drainage protection plan <br /> described below, no surface runoff will intercept the waste rock <br /> piles, the only infiltrating waters will be due to direct precip- <br /> itation. ) At their maximum extent, the waste rock piles on the Doagy #2 <br /> and the C-JD-8 tract will total seven acres. The average volume of <br /> leachate which might be generated annually would be: <br /> 7 acres x 43560 ft2 x 1 ft precipitation x 50% infiltration = <br /> acre year <br /> 152,500 ft3 = 3.5 acre-feet. <br /> This water will percolate into the ground. The fate of the leachate <br /> will be a slow percolation through the underlying soil and rock. As <br />