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2.04.7-1-A. Analyses and programs integral to the Water Rights Plan are presented in several <br />sections of the permit. A review of these sections is appropriate. Pit inflow volumes and pit <br />pumpage drawdown projections are discussed and presented in Probable Hydrologic <br />Consequences at the end of this section. Impacts of mining discharges on downstream water <br />quality and the shallow ground water quality for water use considerations are also presented in <br />Probable Hydrologic Consequences at the end of this section. Specific ground and surface water <br />monitors for the purpose of verifying drawdowns and changes related to water rights in <br />streamflow volumes will be agreed to with DRMS. Finally, the detailed water rights plan <br />which integrates the above -referenced information is presented in Attachment 2.05.6(3(b)(v)-1 <br />(formerly Peabody Attachment 16-1). <br />Water Rights Protection and Mitigation Plan <br />The following discussion briefly summarizes the approach to the water rights plan. All ground and <br />surface water rights within a reasonable distance of the New Horizon Mine have been documented. <br />Pit inflow and pit pumpage drawdown analyses were performed and tabulated. Drawdowns and <br />pit bottom elevations were compared against water righted well production zone elevations to <br />determine which wells, if any, could potentially be impacted by the mining induced drawdowns. <br />Similarly, surface water rights within the one -foot drawdown contours were identified as those <br />surface water rights which could potentially be impacted by the mining induced drawdowns. <br />Drawdown depletion rates were then estimated at the different surface water right locations and <br />replacement rates were determined for each. <br />Calculations were performed to estimate industrial uses of surface water and evaporative losses <br />from the six sediment ponds receiving runoff from the mining areas. This work was performed by <br />Peabody. An augmentation plan was then developed for augmenting these surface water losses <br />during each month of the irrigation period and storing water during the winter months, Table 9 in <br />Attachment 2.05.6(3)(b)(v)-1 (formerly Peabody Attachment 16-1). <br />Calculations were performed for Tuttle and Calamity Draws and the San Miguel River to determine <br />if mine discharges would diminish receiving water quality to the extent that surface water rights <br />would be injured (preclude present or potential uses of the water). This was determined not to be a <br />significant impact and no mitigation is required. <br />Finally, specific, additional monitors will be proposed as part of the water rights plan to help insure <br />that the impact and water loss volume projections were reasonable. Piezometers maybe proposed in <br />the immediate vicinity of the New Horizon 2 mining area to help quantify drawdowns. <br />July 2016 (TR -74) 2.05.6(3)-7 <br />