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4.6 ENGINEEKING UATR <br />• 4.6.1 Cover Material <br />In Section 4.2.5 the daily cover materiel required was <br />estimated to be 10 c.y. <br />4.6.2 Liner Materiel <br />No liners will be constructed. Leech testa indicate that no <br />toxic fluids will be produced and the chemical composition of <br />the ash is better then the enclosing overburden materials. <br />The final surface will be covered with not less than 2' of <br />topsoil material which will be graded, seeded and irrigated. <br />Although permeability of this material is quite high, rainfall <br />and runoff are quite low and leaching can only improve the <br />chemical charecteriatica of the enclosing sands end clays. <br />Approximately 2,000 c.y. of cover materiel will be required <br />for each six month site or between 28,000 and 68,000 c.y. For <br />the life of mine. This is only 2x of total topsoil required <br />which is readily available In stockpiles and in new mining <br />areas that are periodically opened. <br />The proposed sites are formed by depressions in the dragline <br />spoil windrow where a new cut is started. Since the dragline <br />caste to his right or left in an area from where the <br />• overburden is removed, there is always a deficiency of spoil <br />at which ever end of the pit the dragline stetted its cut. It <br />is into this type of depression or occasionally a valley <br />between two spoil piles that our present solid wastes are <br />being dumped. This elevation will vary from a low of 4775 up <br />to 4830. Present spoil water table is et 4730 and is <br />monitored every month. <br />These sites will be verified for construction quality by John <br />Althouae, Colorado Professional Engineer 5380. <br />4.6.3 Appropriate maps are presented on the following pages. <br />4.6.4 Refer to Appendix A, McWhorter Report, for complete <br />construction details and Section 4.5.7, Ground-water Quality <br />and Monitoring. <br />.~ <br />-37- <br />