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• portion of the VLF, the foundation contains a deposit of the Carlton Mill tailings <br />that were relocated in 1994 and 1995 as part of the Phases I and II VLF <br />construction. These tailings have been covered with approximately 100 to 300 <br />feet of compacted fill and overburden for more than 12 years. Design calculations <br />for the Phase 5 VLF show that the tailings will not have any impact on the <br />stability or performance of the VLF. The design grades and calculations are <br />shown in Appendix 8, Volumes V and VI of this document. <br />Underground workings are located within the limits of Phase 5. These workings <br />will be further examined and stabilized as necessary utilizing the methodologies <br />previously approved for the Phase IV VLF under Amendment No. 8 and as <br />discussed in Appendix 8. <br />6.3.3 Construction of Leak Detection, Liner, and Collection Systems <br />The LDS will be installed in the prepared subgrade prior to SLF placement. <br />Design of the LDS was discussed above in Section 6.2.6. After completion of the <br />LDS, the SLF will be placed both to provide protective support for the <br />geomembrane and to provide the base component of the composite liner system. <br />The SLF will be comprised of a minimum one-foot-thick layer of material with a <br />permeability of 1x10-6 cm/sec or less. It is anticipated that the material will meet <br />applicable Technical Specifications without the addition of bentonite, however <br />bentonite will be used as necessary to meet permeability requirements. The SLF <br />will be placed and compacted, then tested by a professional engineer or other <br />appropriately qualified professional to ensure that it meets the Technical <br />Specifications (see Appendix 8 for a complete copy of the Technical <br />Specifications). <br />The "composite" liner system selected for the Phase 5 area is discussed in Section <br />6.2 above and further described in the accompanying design report in Appendix 8. <br />The liner system will be installed in accordance with the Technical Specifications <br />included in Appendix 8. A qualified liner installation company will install the <br />liner and their work will be overseen by a professional engineer or other <br />appropriately qualified professionals, as has been done for construction of <br />previous phases. The completed liner installation, including copies of all required <br />tests performed on the liner, will be presented in a report which will be submitted <br />to the OMLR for review and acceptance prior to initiating solution application <br />and leaching. <br />• Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />6-8