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the start of dewatering these stages (see Mine Plan-Exhibit D). Potential ground water impacts <br /> associated with mining of Stage 2 will be minimized due to the limited time it will be dewatered <br /> (1-2 years) and the fact that it will be used for the disposal of wash fines. The nearest active <br /> residential ground water well within 600 feet of Stage 2 is located on the Schroeder Property. If <br /> needed in order to mitigate impacts associated with the dewatering of Stage 2, RMCC proposes <br /> to install a cistern and provide water delivery service to the Schroeder house until Stage 2 <br /> dewatering ends, Stage 2 refills with ground water and the Schroeder's domestic well is capable <br /> of supplying water to their home. <br /> Monitor wells have already been installed around the Holton Lakes including the common <br /> boundary with the Morton Lakes property; there are two monitoring wells presently in place: one <br /> on the southeast side near the Morton residence and another in the northeast corner near the <br /> Blunt Residence, slightly further north of the Morton Lakes boundary. The Applicant has <br /> installed additional ground water monitoring wells in order to evaluate ground water fluctuations <br /> and the potential for adverse impacts to neighboring wells due to mining. Ground water <br /> elevations in the monitoring wells are measured monthly. In the event that these neighboring <br /> wells are adversely affected by pit dewatering the Applicant will promptly take steps to mitigate <br /> any adverse impacts. <br /> Post Reclamation <br /> Ground water mounding and shadowing associated with the slurry wall sealed portions of <br /> the pit are not anticipated to produce any adverse impacts to adjacent properties. Potential <br /> ground water impacts will be mitigated because of the proximity of the South Platte River and <br /> Big Dry Creek to the sealed pits. Water elevations in the South Platte River and Big Dry Creek <br /> will serve to regulate ground water elevations in the alluvium adjacent to each of the sealed pits. <br /> 8.3 Discharge Permits <br /> Groundwater will be pumped and discharged directly to the South Platte River and <br /> Big Dry Creek. An NPDES Permit(No. COG 501501)has been obtained from the Colorado <br /> Department of Public Health and Environment for ground water discharges to the South Platte <br /> River. The permit will be amended for ground water discharges to Big Dry Creek. This permit <br /> will remain active while mining operations discharge groundwater into the South Platte River. <br /> 13 <br />