Laserfiche WebLink
<br />Cripple Creek & Victor Gold Mining Company Exhibit E Cresson Project Amendment 13 10 <br />revegetated because the coarse rock prevents erosion. Drainage channels or benches developed on the OSAs will be candidates for similar plating with rock and select slopes may be suitably plated with the overburden as a backdrop for other compatible uses. <br />The stability of the reclaimed SGOSA was addressed in permit Amendment 10 documentation. Updates to the stability of the reclaimed slopes, based on the VLF2 Phase 3 modifications are presented in the VLF2 Phase 3 Detailed Design Report, provided in Appendix 1. The final reclaimed surface of the SGOSA will be graded to conform to the stormwater runoff patterns shown on the drawings in Exhibit F. An updated discussion of diversion/conveyance channels and detention basins for the new SGOSA configuration and VLF2 Phase 3 configuration is provided in the VLF/OSA Closure Stormwater Analysis provided in Appendix 3. <br />ECOSA <br />ECOSA is located along the southern (north and east-facing) slopes of Grassy Valley with the vast portions of the OSA lying within the volcanic diatreme. The maximum constructed height of ECOSA will be 10,960 ft amsl, as approved in Amendment 11. Out slopes will be graded to approximately 2.5H:1V with drainage channels established at the back of each bench graded to drain water away from the ECOSA. A minimum of six inches of growth medium will be used to cover the graded overburden with a typical depth of growth medium ranging from six to twelve inches. The soil may be sampled to determine the need for additional soil amendments. Vegetation will be established according to the procedures presented in Section 1.3.3. <br />As discussed in greater detail in Appendix 1, Volume II, of Amendment 11 documentation, the neutralizing capability of the overburden to be placed in the ECOSA, along with the neutralization capacity of the rock in the diatreme, is estimated to be adequate to neutralize potential water quality changes as a result of the overburden placement into ECOSA. <br />The stability of the reclaimed ECOSA was addressed in Amendment 11 and is discussed generally in Section 1.4.1 above. The previous analysis indicates that the reclaimed area of ECOSA will be stable over the long term. <br />The final reclaimed surface of the ECOSA will be graded to conform to the runoff patterns shown on the drawings in Exhibit F. A discussion of diversion/conveyance channels and detention basins for the final ECOSA configuration is provided in the updated VLF/OSA Closure Stormwater Analysis provided in Appendix 3.