1996-06-04_REVISION - M1977493 (9)

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GENERAL DESCRIPTION This report describes the features of the preliminary design for the proposed No. 1 Dam Seepwater Pump Station including design considerations, parameters, and assumptions. The preliminary design is intended to serve as the basis for the final design phase of this project. Some modification of the configuration may be necessary during the final design phase as more detailed analysis and design are completed. The scope of this design includes construction of a new pump station that would be located near the upstream end of Robinson Reservoir, and a new pipeline that would deliver the pumped flow into the water pools on either Tenmile or Robinson Tailing Ponds. Currently, all of the inflow to Robinson Reservoir is pumped to the Tenmile Creek drainage basin using the Robinson Pump Station and pipelines. This system has worked well for a long period of time. However, the integrity of the aging system is a concern at the Climax Mine. Portions of the existing system are located outside of the process water system boundaries. The proposed pump station and pipeline are all within the process water boundaries. It is our understanding that the long range plans for the reclamation of the Eagle River Basin include the eventual conversion of Robinson Reservoir to a clean water reservoir. A necessary part of this conversion will be the isolation and removal of subdrain and seepage water that currently flows into the Reservoir. The current plan includes the construction of an impermeable barrier dike across a portion of the reservoir to isolate the seepage flows from the future clean water stored in the reservoir. A new pumping system would be constructed concurrently to provide a means of delivering the isolated seepage water to the Tenmile Creek basin for treatment and release, or for use in the mill circuit during production periods. 1