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y <br />alternate water sources of comparable quantity and quality. As described in the water <br />augmentation plan, WFC has a 114 acre foot consumptive use right on the Highline <br />Canal which would be used to mitigate the potential 26 acre foot impact on surface <br />water right users from pit inflow drawdown. <br />20. Please change the Impact on groundwater rights. No surface ~or groundwater rights have been identified <br />heading of this paragraph to: within the New Horizon 2 mi area. Therefore, there will be no direct impact from the <br />Impact on water riehts inside approved mining plan o y local water rights. <br />the permit area. Im act of s aterial on roundwater flow and rechar e. The min ~ °e+x~ain <br /> open on the coal has been removed. Following the short-term water level dec <br /> on oundwater system as a result of pumpage of groundwater inflow to the pit, a <br /> o tial long-term impact to the local groundwater flow is the period of time necessary <br /> or resaturation of the spoil material and reestablishment of a flow gradient. Spoil <br /> material at the New Horizon 2 mine will be replaced using techniques which will restore <br /> permeabilities of the material. Thus, the mining operation will not diminish vertical or <br /> horizontal permeabilities but may increase these permeabilities. As a result, there <br /> should be no significant impacts from the mining operation on groundwater flow and <br />21. Please insert the word recharge rates. The time period required for the spoil material to resaturate should be <br />"permit". greatly reduced because of the irrigation recharge as the mined area will be <br /> revegetated for an irrigation type of post mining land use. <br />Containment of pit inflow and impacts on water quality All runoff and pit pumpage from <br />disturbed areas will be routed through sedimentation pond 007. The pond is designed <br />and constructed to impound runoff and pit pumpage from areas disturbed by mining <br />and provide sufficient residence time to insure that the pond discharge water chemistry <br />meets the effluent requirements specified in the NPDES. Permit. A review of the <br />chemical and flow data indicates that the potential for any discharge from Pond 007 to <br />exceed receiving stream or federal standards is minimal. Past history of mine <br />operations at the Nucla Mine indicate very few exceedances of the standards over the <br />years of operations.' As previously discussed, highest pit inflow is predicted to occur in <br />year 5 at approximately 5,600 cubic feet per day. To assess the impact of this inflow on <br />Calamity Draw and the San Miguel water quality, it was assumed that the entire flow <br />was discharged and that the TDS level for the overburden aquifer was representative of <br />the chemical load. The duration of the water quality impacts is relatively short term (5 <br />years) and the significance of the impact is negligible as TDS increases in the range of <br />0.08 to 1.5 percent are projected on the San Miguel River and Calamity <br />22. ~ Please insert the words <br />"inside the permit area". <br />(REVISED 9/99) 2.04.7-46 <br />