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c. Amount of water used for dust suppression. <br />d. Amount of water shipped with coal. <br />e. Amount of water lost through pond evaporation. <br />f. Amount of augmentation water required. <br />g. Amount of augmentation water from direct flow <br /> sources described in paragraph 6. <br />h. Amount of augmentation water released from storage <br /> reservoirs described in paragraph 7. <br />12. Continuing Post-Mining Depletive Effect: <br />At the completion of the mining, the mine will be left <br />as an underground cavern, which will refill from the surrounding <br />aquifer. The refilling of the mine area may result in continuing <br />depletions to the stream system until steady-state conditions can <br />be re-established. Since the remaining mine area will have a <br />volume of approximately 97 acre feet, this volume could <br />potentially be depleted from the stream system, in addition to <br />water that would fill the void spaces in mined areas that have <br />been filled with waste rock. <br />The required portion of the direct flow water rights <br />and storage rights will be committed to the stream system for the <br />period of time necessary to re-establish water levels in the <br />aquifer to offset expected stream depletions. The augmentation <br />requirements during the post-mining period to offset continuing <br />depletions are presented in Exhibit G. The calculations <br />presented in Exhibit G are based on Darcy calculations of inflow <br />to the mine for specific time steps, assuming steady-state flow <br />for each time step. <br />An alternative to allowing the mined area to fill <br />naturally is to intentionally flood the mine area. This would <br />fill the void left by the mine and would satisfy post-mining <br />requirements in a shorter period of time. Applicant proposes <br />that the mine be flooded at the conclusion of mining to negate <br />continuing post-mining depletive effects. This approach is <br />acceptable to the Colorado Mined Land Reclamation Division. <br />However, in the event that the applicant determines that it is <br />either uneconomical or infeasible, for whatever reason, to flood <br />the mine at the completion of mining, the applicant will provide <br />augmentation water to the stream system consistent with the <br />values presented in Exhibit G. <br />-17- <br />