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• Seneca will incorporate the proposed 010 end 011 sediment ponds in the Annand Drau and <br />Cressy Creek drainages in a renewal application for the existing NPDES Permit (CO-0000221) <br />prior to any mining disturbance. All terms and agreements specified in the permit will be <br />adhered to during the mining operation. No treatment of pond effluent is anticipated. <br />Plans for sampling overburden and topsoil to identify potentially deleterious materials <br />have been developed and are outlined in Tab 21 (MinesoiL Reconstruction). Core, acid <br />sampling in select geologic areas (Wolf Creek overburden) end topsoil sampling programs <br />ere employed to identify the existence of significant zones of acid and toxic materials <br />(Tab b, Geology). With the help of cast blasting (disperses spoil better such that acid <br />and toxie materials do not end up on the spoil surface) and the above-referenced sampling <br />programs, surface runoff from reclaimed areas will not come into contact with materials <br />that would contribute to elevated levels of acid or toxic constituents in the runoff. <br />Topsoil handling procedures (Tab 21, Minesoil Reconstruction) and revegetation methods <br />(Tab 22, Revegetation Plan) have been developed to prevent erosion and minimize the <br />additional contribution of sediment to runoff. Plans presented in both Tabs include the <br />establishment of topsoil piles, temporary seeding of topsoil piles, some disking, and <br />~' prompt reseeding of reclaimed areas. <br />The Surface Water Control Plans developed for Toast (see Exhibit 13-2, Tab 13, Facilities) <br />include three temporary diversions designed according to accepted engineering design <br />criteria. They will be built to minimize erosion and prevent measurable additional <br />contributions of sediment by Limiting flow velocities and tractive forces that cause <br />excessive erosion. All temporary diversions will be removed and reclaimed after mining <br />has been completed. Culverts presented in the Surface Water Control Plan have been <br />designed to feature adequate freeboard and outf all protection (riprap), if needed, to <br />minimize erosion. <br />Surface Water Quantity. Sediment ponds, diversions and culverts have been planned and <br />located to control alt drainage into, through and out of the Yoast Mine, and to insure <br />that changes in surface eater quantity are minimized (see Exhibit 13-2, Tab 13, <br />Facilities). <br />• Pos[mining topographies are planned to approximate the original premining contours (see <br />3 <br />