Laserfiche WebLink
<br />the leachate percolates, chemical interaction of the water a d soil <br />will continue, causing the less mobile constituents to becom adsorbed <br />onto the underlying rock. The uppermost transmissive zone i to which <br />the leachate from the JD-8 property will infiltrate will be he <br />sandstone bodies in the basal unit of the Brushy Basin h?embe of the <br />Morrison Formation and in the Top Rim of the Salt Wash 6lembe of the <br />Morrison Formation. (See Exhibit G to the C-JD-B Applicatio .) A <br />comparison of the water quality expected from the leachate a d the <br />mine tvater expected from these formations (see Item f5 below) shows <br />that leachate from the waste rock piles will not deorade gro ndwater <br />quality. <br />Design of Drainage Protection for Waste Piles <br />In order to protect drainages and prevent the intrusion of r Hoff <br />into the waste rock pile, a diversion and culvert have been esigned <br />for the Doaay ~2 site. No diversion is necessary °or the JD 8 tract, <br />as it does not lie in a drainage. The drainage area above t e Doaay <br />#.2 ~.vaste dump encompasses approximately 6P acres. The desig precip- <br />itation evert chosen was a thunderstorm with a 10 year retur period <br />and a duration of one hcur. The precipitation depth would b approxi- <br />mately one inch (Miller et al 1973). <br />Due to the small size of the drainage area, the drainage col ection <br />structures were designed based on peak discharge using the R tional <br />Formula rather than based on a flood unit hydrograph. The p ak dis- <br />charge (Qp) was calculated to be 41 cfs: <br />Qp = 1.0083 CiA <br />