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appropriate corrective action. Impacts would trigger mitigation measures that may include, but <br />are not limited to: <br />1. Pumping from mounding areas to recharge ponds in shadowing areas. <br />2. Installing surface or underground drain systems to transport groundwater from mounding <br />areas to shadowing areas. <br />3. Diverting surface water flows to recharge ponds in shadowing areas. <br />Water Quality <br />Mining and reclamation operations shall comply with Colorado Department of Public Health and <br />Environment National Pollution Discharge Elimination System (NPDES) regulations. The <br />existing 25 Avenue Site Colorado Discharge Permitting System (CDPS) permit for stormwater <br />management and discharge flows to protect surface water quality on and off the proposed <br />amendment area will be updated to include the new mining and reclamation activities. The <br />permit includes the continued updating and implementation of a site Stormwater Management <br />Plan designed to prevent the contact and transport of potential contaminants to surface waters by <br />stormwater flows. <br />The depth to groundwater fluctuates by a couple of feet depending on the season, but ranges <br />from about 10 to 15 feet below ground surface. Average depth of the existing lakes is about <br />15 feet below the water surface. Due to the absence of large quantities of potential pollutants on <br />site, the mining and reclamation operations will not affect groundwater quality on or off the site. <br />As stated above, mining and reclamation activities shall operate under a CDPS permit and <br />Stormwater Management Plan. The plan provides for regular inspections of potential <br />contaminant areas such as mobile equipment and fuel or lubricant storage locations. Inspections <br />and best management practices are incorporated into the plan to protect both surface and <br />groundwater quality. <br />Greeley 25'" Avenue Site <br />DRMS 112 Permit Amendment Application Page 22 <br />