Laserfiche WebLink
Water Quality <br />An application for an NPDES Permit has been submitted to the Water Quality Control Division at <br />the Colorado Department of Public Health & Environment for the original NCCI Pit #1. This <br />permit will be amended to include the expansion property. <br />Impacts to Groundwater/Hvdroloaic Balance <br />As approved in Technical Revision #3, NCCI will monitor the groundwater levels surrounding <br />the site and provide groundwater recharge via perimeter ditches/ponds. NCCI will construct <br />these ditches/ponds in the locations where direct discharge to an existing adjacent ditch is not <br />available to ensure that the stabilized levels are maintained. They will discharge dewatering <br />flows into existing adjacent ditches where possible to limit the disturbance to the surrounding <br />land. See Exhibit C, Mining Plan Map, for the locations of the recharge ditches/ponds. <br />To summarize the mitigation process, as each phase of mining/dewatering occurs it will draw <br />down the surrounding groundwater level to some extent. NCCI will implement the groundwater <br />recharge activities adjacent to each phase as it is mined. The cone of depression/radius of <br />influence will then stabilize. Once it has stabilized NCCI will maintain the groundwater levels in <br />their monitoring wells in that area per the criteria detailed in Technical Revision #3. See <br />Technical Revision #3 for a detailed explanation of the extent of the groundwater impacts and <br />how the impacts will be mitigated. <br />Three groundwater wells that are not owned by the applicant (Figure Exhibit G-1 #3, #6, #7) are <br />potentially located within 600 feet of the amendment area tract mining limits. Well waivers have <br />been included for wells #3 and #6. Information for the owner of well #7 and the physical location <br />of the well itself could not be located. It will be verified during the substitute water supply plan <br />and well permit update for the pit whether this well is within 600 feet of the mining area. A well <br />waiver will be obtained for this well if this is the case. Five other wells (Figure Exhibit G-1 #4, #8, <br />#11, #89, #93) that are potentially within 600 feet of the amendment area tract are either owned <br />by the applicant, are oil/gas wells, or are wells with no permit on record, therefore groundwater <br />impacts to these wells do not need to be addressed. <br />NCCI Pi[ #1 <br />DRMS 112 Permtt Amentlment <br />43 <br />