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TR -26 has been approved by the Division to further address ground <br />water monitoring, springs 8s seeps and additional surface monitoring of <br />the Hay Gulch Ditch. Data obtained will be used to update the Probable <br />Hydrologic Consequences and the Cumulative Hydrologic Impact <br />Assessment of Hay Gulch and surrounding areas. <br />No significant hydrologic consequences of mining are anticipated. All <br />coal to be removed from the mine lies above the potentiometric surface of <br />Hay Gulch, the only known aquifer in the area. Therefore, there should <br />be no diminution of water quality or quantity to Hay Gulch from the <br />mine workings due to subsidence related to mining. <br />Surface drainages from the project area from the main haul road, Small <br />Area Exemption #1 (SME#1), report to a native channel and eventually to <br />the Hay Gulch Ditch. Nearly all of the runoff from SME# 1 reports to a <br />filter check dam, located adjacent to the cattle guard. This filter check <br />dam is cleaned out regularly as needed. <br />Surface drainages north of the Sedimentation Pond from disturbed areas <br />of the surface facilities report to the Sedimentation Pond for evaporation <br />and infiltration. In the event a major storm, or series of storms, exceeds <br />the capacity of the Sedimentation Pond, discharge would report to a <br />native channel, and eventually the Hay Gulch Ditch. This discharge <br />point is permitted with the National Pollutant Discharge Elimination <br />System (NPDES) through Colorado Department of Health and <br />Environment (CDPHE) discharge permit COG850001 as discharge <br />number 003. See "Surface Water Monitoring" later in this section for <br />Monitoring procedures and parameters. <br />No water is known to occur in any rock unit above or immediately below <br />the coal seams being mined based on the mining at the National King <br />Mine within or immediately adjacent to the permit boundaries. Again, <br />there is little likelihood of significant impact to quantity or quality of <br />groundwater resources resulting from the King II Mine. Should <br />subsidence related features appear above the mine, water would recharge <br />into the localized groundwater system and not continue off-site, given the <br />dissected nature of the project site topography. <br />The design of the portal facilities and the dip of the strata facilitate <br />drainage of any encountered water in the workings toward the surface. <br />While not anticipated, should water be encountered in amounts that <br />reach the surface, monitoring and control measures will be employed. <br />GCC Energy, LLC King II Mine <br />Section 2.05.6 <br />Page 5 July 11, 2017 (RN -07) <br />