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Cripple Creek & Victor Gold Mining Company Squaw Gulch Valley Leach Facility Design <br />4.0 Valley Leach Facility (VLF) Design <br />4.1 General <br />The Squaw Gulch VLF design is consistent with the previous designs approved by the <br />MLRB and OMLR, and implemented by CC &V for the existing VLF. Characteristics of <br />the Squaw Gulch VLF design can be summarized as follows: <br />• Squaw Gulch VLF is located to the north of the current Cresson Project VLF in the <br />areas named Squaw /Anaconda and Swede Gulches, increasing the available <br />OSA. <br />• Development of a dedicated PSSA for the Squaw Gulch VLF extension. The <br />PSSA would be formed by constructing a containment berm, which would also <br />serve as part of the Highway 67 realignment. <br />• Installation of composite liner systems within the OSA and PSSA areas will <br />generally be on slopes of 2.5H:1V (horizontal:vertical) or flatter, with 2H:1V slopes <br />in localized areas of the VLF where stability of the facility will not be affected. <br />This section describes the VLF design for Squaw Gulch including foundation <br />preparation and installation of the underdrain system (UD), leak detection system <br />(LDS), liner system, high - volume solution collection system (HVSCS), and low volume <br />solution collection system (LVSCS). Design criteria used in the design of the VLF <br />were presented in Section 1.4, and are discussed in more detail in the following <br />sections. <br />The VLF is designed to be constructed to the planned ore depth and ultimate limits <br />shown on the drawings, based on the design criteria and analyses presented in this <br />report. The VLF is designed as a closed system where leach solutions are contained <br />within the lined area. Leach solutions and precipitation volumes generated during the <br />100 - year /24 -hour design storm event combined with other maximum operational and <br />climatic events will be contained within the proposed double geomembrane -lined <br />internal VLF PSSA. <br />The quality of the constructed VLF is an important aspect of this project. Qualified <br />personnel under the supervision of an experienced professional engineer registered in <br />the state of Colorado will be on site full time to observe and /or provide testing for <br />vegetation and soil removal, underground working remediation, subgrade preparation, <br />fill placement, SLF placement, UD and LDS installation, geomembrane installation, <br />and placement of LVSCF and DCF. Technical specifications for the VLF are included <br />in Appendix H. The earthwork and geomembrane test results and locations will be <br />summarized in an as -built report certified by a professional engineer registered in the <br />state of Colorado, a copy of which will be forwarded by CC &V to the OMLR for <br />acceptance. <br />Project No.: 74201125G0 Page 17 <br />1 September 2011 <br />amec0 <br />