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Cripple Creek&Victor Gold Mine <br /> Valley Leach Facility Expansions ■ <br /> Detailed Design for Permitting <br /> NewFields Project No.475.0106.064 <br /> • March 2024 <br /> 1.2. Scope of Work <br /> NewFields was retained by CC&V to provide engineering services for the VLF Expansions. This <br /> design report includes the following: <br /> Design and layout for the Expansions are to be constructed in four stages; <br /> Updated Water Balance Model, to be completed with the support of Piteau Associates; <br /> and, <br /> Updated Construction Technical Specifications for the VLF Expansions. <br /> 2. SITE CHARACTERIZATION <br /> 2.1. Location and Topography <br /> CC&V is located in Teller County, Colorado, in between the towns of Cripple Creek and Victor. <br /> VLF1 is located in Arequa Gulch and to the south of VLF2. VLF2 is located in the Maize Anaconda, <br /> and Swede Gulch areas, between Raven and Gold Hill. The VLF1 and VLF2 Expansions will extend <br /> the two facilities to the northeast and southeast, respectively,visually forming one combined VLF <br /> that buttresses up against Joe Dandy Hill to the East. Drawing A001 shows the proposed limits of <br /> • the Expansion. <br /> 2.2. Climate <br /> In October 2018, CC&V commissioned Knight Piesold (KP) to evaluate the current stormwater <br /> management plans for the site. As part of their evaluations, KP provided recommendations to <br /> update the climate data, including increasing the 100-year/24-hour storm event from 3.5 to 4.1 <br /> inches. These recommendations have been utilized in the water balance and sizing of the high- <br /> volume collection piping. <br /> 2.3. Underground Workings <br /> If encountered, historical underground mine workings will be mitigated as needed to provide a <br /> robust and safe foundation for the expansion. Based on the remediation plans completed during <br /> the construction of the current VLF1 Phase 5 and VLF2, the following guidelines will be used: <br /> Shafts/Stope Remediation <br /> o For open excavations where the depth of bedrock is less than 7 feet below the <br /> final soil liner fill (SLF) subgrade surface: Backfill open shafts with coarse shaft <br /> backfill to approximately 10 feet below the SLF subgrade and then place a <br /> concrete plug, cemented rock fill, and structural fill to achieve SLF subgrade <br /> surface. <br /> • <br /> Page 3 <br />