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• VLF liner. Approximately six inches of growth medium will be used to cover the <br />graded overburden and clay material. Other available soil will be used if <br />stockpiled growth medium is not available. The soil will be sampled to determine <br />the need for soil amendments. Vegetation will be established according to the <br />procedures presented in Section 11.3. <br />It is expected that the clay cover will minimize infiltration of water into the pile. <br />As discussed in greater detail in Appendix 1, Volume II, the neutralizing <br />capability of the overburden to be placed in the ECOSA along with the <br />neutralization capacity of the rock in the Grassy Valley feeder of the diatreme is <br />estimated to be adequate to neutralize any potential water quality changes as a <br />result of the overburden. <br />The stability of the reclaimed ECOSA was addressed in Section 5.7.3 of this <br />Project Description. This analysis indicates that the reclaimed area will be stable <br />over the long term. <br />The final reclaimed surface of the ECOSA will be graded to conform to the runoff <br />• patterns discussed previously in Section 5.7.3. A discussion of diversion/ <br />conveyance channels and detention basins for the final ECOSA configuration also <br />is provided in Section 5.7.3. <br />Surface Mine Backfill Areas <br />Several mine areas will be backfilled with overburden material to approximately <br />the ground surface (East Cresson Mine Area and Schist Island portion of North <br />Cresson Mine Area). These backfilled areas will be reclaimed in much the same <br />manner as the OSAs. Slopes on the backfill connecting to the surrounding terrain <br />will be graded to an overall slope of approximately 2.51-1: IV. Slopes will vary in <br />steepness within this overall slope to generate irregular landforms. Drawing F-1 <br />and the financial warranty calculations have been conservatively developed based <br />on an overall 2.511:1V slope criterion for all backfill materials. Portions of the <br />Main Cresson backfill will be graded and reclaimed at an approximate 2H:1 V <br />slope due to placement constraints. <br />Benches with varying widths, spacing, and grades may be developed along the <br />slopes to control erosion, facilitate access for revegetation, or provide sites for <br />tree and shrub plantings. <br />• Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />11-11