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Knight Piesold <br /> CONSULTING <br /> Environmental Department, Meg Burt, Senior Manager October 8, 2018 <br /> Cripple Creek and Victor Gold Mining Co. (Newmont) <br /> • EMP 16 <br /> — Existing spillway chute does not contain riprap; riprap design is required. <br /> — Existing inflow diversion channel capacity increase required. <br /> • EMP 17 <br /> — Spillway does not currently exist; a full spillway design is required. <br /> • EMP 17a <br /> — Existing spillway chute capacity and riprap increases required. <br /> — Existing inflow diversion channel does not contain riprap; riprap design required. <br /> • EMP 17b <br /> — Existing spillway chute capacity increase required. <br /> • EMP 18 <br /> — Spillway does not currently exist; a full spillway design is required. <br /> — North inflow diversion channel does not contain riprap; riprap design required. <br /> — West inflow diversion channel capacity and riprap increases required. <br /> • EMP 20 <br /> — Existing spillway inlet weir capacity, chute capacity and riprap increases required (i.e., full redesign). <br /> — North inflow diversion channel does not contain riprap; riprap design required. <br /> — South inflow diversion channel capacity and riprap increases required. <br /> • EMP 21 <br /> — Both existing spillways' (located in parallel) inlet weir capacity, chute capacity and riprap increases <br /> required (i.e., full redesigns). <br /> These designs were largely provided to CC&V in a separate FS-level design report document. We <br /> appreciate the opportunity to work with the CC&V team on this project. Please contact the undersigned if <br /> you have comments, questions, or require further information. <br /> Sincerely, <br /> Knight Piesold and Co. <br /> yan ahl, P.E. aul W. Ridlen, P.E. <br /> ,�OfaCj <br /> Senior Water Resources Engineer President <br /> cc: CC&V: Katie Blake, Justin Bills, Ron Parratt <br /> Knight Piesold: 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 /> 12 <br />