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• pattern to maintain a permeable layer leading to the PSSA. The HVSCS is <br />discussed in Section 6.2.4 below. <br />The SLF will come from a clay borrow area that is located primarily in the <br />location of the proposed ECOSA footprint. After vegetation clearing and growth <br />medium removal and prior to the use of this area for overburden storage, clay will <br />be removed for use as the SLF.. The location of the clay borrow area is shown on <br />Drawing C-4 in Exhibit C, Volume I. <br />The geomembrane liner system in use on the existing VLF and as proposed for <br />the Phase 5 area has been load tested for the increased leach facility maximum <br />depth of approximately 800 feet. The tests indicate that the existing and future <br />liner systems will withstand the pressure of the additional depth and will not <br />puncture or tear. This information is discussed in detail in Appendix 8. <br />6.2.3 PSSA Liner System <br />Where the Phase 5 ore overlaps onto the existing VLF, some pregnant solutions <br />will report to the Phases I and II PSSAs. Otherwise, pregnant solutions for the <br />• Phase 5 area will report to the Phase 5 PSSA. The Phase 5 PSSA is designed to <br />simultaneously contain the total of the anticipated operating solution volume plus <br />10 million gallons additional storage; a 12-hour draindown that would occur if <br />there was no pumping of solution from the PSSA; the precipitation from a 100- <br />year, 24-hour storm event; the monthly mean precipitation levels using historic <br />data at a 95 percent confidence level; and solution retained in the field capacity of <br />the ore contained within the PSSA. The Phase 5 PSSA also is designed with a <br />minimum five feet of freeboard above the level required to hold all of these <br />amounts. <br />The Phase 5 VLF PSSA will be constructed on native ground and compacted fill <br />and ore, and is located along the eastern edge of Phase IV. The western edge of <br />the PSSA will be founded on the regraded and compacted Phase IV ore slope. The <br />eastern edge of the PSSA will be founded on compacted fill overlying either <br />native ground (Squaw Mountain) or the regraded AGOSA. The PSSA <br />embankment and termination berms will be constructed from compacted fill. A <br />complete discussion of the PSSA can be found in Appendix 8. <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />6-3