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4.4 Valley Leach Facility (VLF) Design <br /> 4.1 General <br /> The Phase 5 VLF design is consistent with the previous designs approved by the MLRB and <br /> DBMS, and implemented by CC&V for the existing VLF. The Phase 5 VLF design can be <br /> summarized as follows: <br /> ■ Extension of the VLF to the north and east of Phase IV,along Squaw Mountain and <br /> the AGOSA,increasing the available ore storage area. <br /> ■ Development of a dedicated PSSA for the Phase 5 VLF extension. The PSSA would <br /> be formed along the eastern side of the Phase IV VLF,site grading, and a <br /> containment berm at the southern edge of the VLF. <br /> ■ Increasing the ore height within Phase I through IV VLF from 590 feet(Amendment <br /> No. 8) to an approximate maximum of 800 feet. The maximum ore height for Phase <br /> 5 is 590 feet. <br /> ■ Using lined 2H:1 V slopes within the VLF, in localized areas where stability of the <br /> facility will not be affected. <br /> This section describes the design for Phase 5 VLF including foundation preparation and <br /> installation of the underdrain system,leak detection system, liner system,high-volume solution <br /> collection system(HVSCS), and low volume solution collection systems(LVSCS). Design <br /> criteria used for the Phase 5 VLF were presented in Section 1.3 and are discussed in more detail <br /> in the following sections. <br /> Phase 5 VLF is designed to be constructed to the planned ore depth and ultimate limits shown on <br /> the drawings,based on the design criteria and analyses presented in this report. The VLF is <br /> designed as a closed system where leach solutions are contained within the lined area. Leach <br /> solutions and precipitation volumes generated during the 100-year/24-hour design storm event <br /> combined with other maximum operational and climatic events will be contained within the <br /> existing double geomembrane-lined internal Phase I PSSA,Phase II PSSA,Phase IV PSSA, the <br /> lined Phase UII/III ESP,and the proposed double geomembrane-lined internal Phase 5 VLF <br /> PSSA. <br /> The quality of the constructed VI.F is a very important aspect of this project. Qualified <br /> personnel under the supervision of an experienced professional engineer registered in the State of <br /> 36 <br />