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~: <br />SMITH WILLIAMS CONSULTANTS, INC. <br />• <br />Phase 5 VLF above the lined surface and using an in-place ore dry density of 11'0 pounds per <br />cubic foot (pcf): The Phase 5 VLF final ore topography is shown on Figure 1. Cross sections <br />through the Phase 5 VLF are shown on Figure 2. <br />The pregnant solutions from the Cresson Project VLF will be fully contained within the existing <br />Phase I, Phase II, and Phase IV PSSAs; the 20-million-gallon (MG) Phase UIUIII External <br />Storage Pond (ESP); and the new Phase 5 VLF PSSA. The water balance for the Phase 5 VLF <br />utilizes a dynamic water balance model, which tracks solutions through the PSSAs (Phase I, <br />Phase II, Phase IV, and Phase 5) and the ESP. As in previous Amendments, the water balance <br />addresses operating volume, draindown volume, solution accumulation due to seasonal climatic <br />variation at a 95-percent confidence level, the 100-year/24-hour design storm event, and <br />available pore space of the ore within the PSSAs. <br />A surface-water diversion system has been designed for the Phase 5 VLF extension and is sized <br />to divert upgradient surface-water flows generated from the 100-year/24-hour storm event. Both <br />operational and post-operational diversion ditches have been sized. As needed, temporary <br />ditches will be constructed during operations along the edge of the perimeter access road and <br />elsewhere to convey runoff from the minor watersheds between the edge of the VLF and the <br />ultimate diversion-channels. Where needed, sedimentation ponds have also been included in the <br />design. <br /> <br />S:\PROJECTS\1125 CC&V PHASE 5 VLF\H2 - DESIGNWREQUA VLF\VLF PHASE 5 FINAL REPORT V2.DOC 'L <br />