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Knight Piesold <br /> CONSULTING <br /> Environmental Department, Meg Burt, Senior Manager April 27, 2018 <br /> Cripple Creek and Victor Gold Mining Co. (Newmont) <br /> — EMP 20(inlet weir, chute capacity, and riprap) <br /> — EMP 21 (inlet weir, chute capacity, and riprap),two spillways in parallel required <br /> • Impoundment volume capacities: <br /> — EMP 6 <br /> — EMP 8a <br /> — EMP 13 <br /> These designs are currently in progress and will be completed within the schedule that was agreed to <br /> with CC&V. We appreciate the opportunity to work with the CC&V team on this project. Please contact <br /> the undersigned if you have comments, questions, or require further information. <br /> Sincerely, <br /> Knight Piesold and Co. <br /> , P.E. Paul W. Ridlen, P.E. <br /> Water Resources Engineer President <br /> cc: CC&V: Katie Dehlin, Justin Bills, Ron Parratt <br /> Knight Piesold:Victor Lishnevsky, Rowan Sauer, Thomas Jamieson-Lucy <br /> Enclosures: <br /> Tables <br /> Table 2.1: Individual Curve Number Values <br /> Table 2.2: Existing Basin Composite Curve Number Values <br /> Table 2.3: Existing Diversion Channels and Spillways 100-year/24-hour Storm Event Peak Flows <br /> Table 2.4: Existing Diversion Channels 100-year/24-hour Storm Event Evaluation <br /> Table 2.5: Existing Spillway Inlet Weirs 100-year/24-hour Storm Event Evaluation <br /> Table 2.6: Existing Spillway Chutes 100-year/24-hour Storm Event Evaluation <br /> Table 2.7: Existing EMPs 2x 10-year/24-hour Storm Event Evaluation <br /> Table 2.8: Previous: Current Comparisons — Existing Contributing Basin Areas and Runoff Curve <br /> Numbers <br /> Table 2.9: Summary of Existing SWMP Evaluation Findings <br /> Table 3.1: Summary of Modified SWMP Evaluation Findings <br /> Table 4.1: Modified EMP 22 Spillways 100-year/24-hour Storm Event Peak Flows <br /> Table 4.2: Modified EMP 22 Spillways Inlet Weirs Detailed Hydraulic Sizing Calculation Results <br /> Table 4.3: Modified EMP 22 Spillways Outlet Channels (Chutes) Detailed Hydraulic Sizing Calculation <br /> Results <br /> Figures <br /> Figure 2.1: Existing SWMP General Arrangement and EMP Contributing Basin Delineation Map <br /> Figure 2.2: Existing ECOSA Area Diversion Channels Contributing Basin Delineation Map <br /> Figure 2.3: Existing EMP 8b Diversion Channel Contributing Basin Delineation Map <br /> Figure 2.4: Existing SWMP General Arrangement Curve Number Delineation Map <br /> Figure 2.5: Existing Diversion Channels and Spillways HEC-HMS Flow Routing Diagram <br /> Figure 3.1: Modified SWMP General Arrangement and EMP Contributing Basin Delineation Map <br /> Figure 3.2: Modified EMP 8a and 8b Diversion Channel Contributing Basin Delineation Map <br /> Figure 4.1: Modified EMP 22 Spillways HEC-HMS Flow Routing Diagram <br /> 11 <br />