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• <br />Alternative Water Supply Information <br />Mining on Federal Lease No. C-30168 is not expected to cause <br />significant modifications in either the surface or groundwater regime <br />beyond the boundaries of the tract. A quantified study of the <br />hydrologic impact of mining is presented in Section 2.05.6(3)(b) <br />(iv) . <br />The proposed extension of the existing mine will require <br />water for two uses, fugitive dust control and sanitation. Estimates <br />of water requirements are as follows. <br />USE QUANTITY USE PERIOD <br />Fugitive Dust Control 20,000 gal/day 4 mo/yr <br />7.5 ac ft/yr <br />Sanitation 4,500 gal/day 12 mo/yr <br />5 ac ft/yr <br />Both demands will be met principally by groundwater utili- <br />• zation. Water for fugitive dust control will be drawn from the <br />sediment control pond. This pond will be fed by groundwater which <br />seeps into the mine and is pumped from the pit. <br />Water for sanitary usage will be drawn from a well which <br />penetrates the upper sandy section of the Pierre Formation. A <br />permit for this well located in the SW; of Section 2 near Pit 1 <br />has been approved by the Colorado Division of Water Resources. <br />water from this well is suitable for sanitary usages; however, it <br />will require some treatment if utilized for domestic consumption. <br />n <br />U <br />The area to be mined, 68 acres, is so small in relation to <br />the total area of recharge of the Coalmont Formation on the floor <br />of North Park that mining should have negligible effects on the <br />recharge and storage capacities of the aquifer as a whole. However, <br />some local effects will be evident. As mining progresses, seepage <br />from the Coalmont beds into the mine will occur mainly along the <br />-72- <br />