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REFUSE PILE EXPANSION A culvert will be placed in SylvesterGulch to provide access to the RPE. The culven will be relocated once during the life of the RPE, as the haul road will be moved to access the pile for Phase 3 and 4. When the haul road is relocated an a second culvert crossing installed, the first culvert will be removed and the crossing reclaimed. At the end of the mine life, when access to the pile is no longer required, the second culvert will also be removed and the crossing reclaimed. The sediment ponds will be removed once the RPE has been revegetated and stabilized, and the untreated drainage from the area ceases to contribute additional suspended solids above natural conditions. In addition, the sediment pond will be removed when the quality of untreated drainage from the disturbed area meets the State and Federal water quality standard requirements applicable for the receiving stream. When the ponds are removed, the affected lands will be regraded and revegetated. A[ the time the sediment pond is removed, sediment ditches will also be removed and those areas reclaimed. The upper clean water diversion ditch will remain permanentlyas required by Rule 4.05.3(3). 9.5 Erosion Control To prevent surFcial scouring from overland runoff, finished slopes will have 1-ft high berms that are the width of a bulldozer blade and referred to as contour furrows in this report. The contour furrows will be constructed to prevent runoff from flowing farther than 50-fee[ vertically without encountering a contour furrow. Atypical detail for an erosion control contour furrow is shown on Figure L-3. Reclaimed soil surfaces will also be promptly seeded and mulched following the final grading of topsoil cover. 9.6 Miscellaneous Reclamation The haul road which will service the RPE will be reclaimed at [he end of [he mine life, to approximate ori_inal contour. When the road is removed, the affected lands will be regraded and revegetated. ~¢ When groundwater monitoring is no longer required for the pile, piezometers RPE-I and RPE-4 will be sealed pursuant to Rule 4.07. Stability monuments will also be removed when no longer required. 9.7 Estimate of the Cost of Reclamation The following section details the major reclamation tasks, based on the worst case disturbance during this five-year permit term. The cost estimate is based on the time line presented in Table 3, which shows the five-year permit term ending during Phase 3. .Cover RPE with subsoil from stockpile on north side of Highway 133 .Cover RPE with topsoil from stockpile on north side of highway .Construct contour furrows on RPE .Replace topsoil at Highway 133 stockpile area .Remove sediment pond and sediment ditches at RPE .Seal two piezometers .Remove stability monuments •Backfill and grade haul road .Remove Sylvester Gulch culvert crossing .Seed, mulch, and fertilize RPE, haul road, and north soil stockpile area Harding Lawson Associates 18