2011-03-14_REVISION - M1977493 (62)

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>„a'. 3 01, v a Ell CM0001635 Page 7 Increasing the reservoir storage will require raising the crest of the current dam structure from an elevation of 10,725 feet msl to an elevation of approximately 10,770 feet msl. The configuration of the increased reservoir is illustrated on Figure 4. The supporting calculations for determining the dam configuration for the larger reservoir are presented in Appendix A. 3.1.1.1 Discharge Permit Issues Future discharges of water from the Eagle Park Reservoir to the Eagle River fall under the Colorado State Regulation, (CSR) 6. 1.0 (Regulations for the State Discharge Permit System). A review of this regulation was conducted to evaluate whether a discharge permit will be required for the Eagle Park Reservoir. In this review, both the general permit criteria and stormwater permit criteria were reviewed. Under CSR Section 6.4.1 (Applicability - Generally) which summarizes the general criteria requiring a discharge permit, the regulation states "No person shall discharge any pollutant into any state water from a point source without first having obtained a permit from the Division for such discharge except that activities such as diversion, carriage, and exchange of water from or into stream, lakes, reservoirs, or conveyance structures, or storage of water in or release of water from lakes, reservoirs, or conveyance structures in the exercise of water riphts shall not be considered to be point source discharges of pollution under this article." CSR Section 6.4.2 3) 0 ( of the regulations governing the applicability of stormwater discharges indicate the division may not require a permit for discharges of stormwater runoff from mining operations "... composed entirely of flows which are from conveyances or systems of conveyances (including but not limited to pipes, conduits, ditches, and channels) used for collecting and conveying precipitation runoff and which are not contaminated with or.that has not come into contact with, any overburden, raw material intermediate products finished product, byproduct or waste products." Under the anticipated conditions for the Eagle Park Reservoir, the water entering the reservoir will be from the existing interceptor trenches that collect stormwater runoff that is not contaminated or impacted by mining activities. Therefore, based on the language in the regulation, discharges of water from the Eagle Park Reservoir may not require a discharge permit. However, given the active status of the Climax Mine, the state may require a stormwater management plan, which may be used to regulate quality and quantity of discharges. Negotiations with state regulatory agencies will be required to determine the final status of the Eagle Park Reservoir discharges. 3.1.2 Robinson Lake Drain Figure 3 presents the location of the Robinson Lake Drain. The purpose of the drain is to provide I UM _ Environmental