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than20 acre-feet/year for dust suppression, five acre-feet/year for sanitary facilities, and <br />50 acre-feet/year for other uses. <br />Protection of the Hydrologic Balance <br />The mining and reclamationplan for the Carbon Junction Mine has minimized the <br />impacts to the prevailing hydrologic balance within and adjacent to the permit area in the <br />following ways. <br />Surface Water <br />Surface water entering the permit area is either diverted around and away from disturbed <br />areas, or is passed into the sediment control system where it ultimately discharges from a <br />sediment pond designed and constructed in accordance with CDRMSrequirements or <br />evaporates from the site. There are no longer any open pits, therefore there is noponding <br />of water on the coal seam, which could potentially lead to acidification of surface water. <br />Surface water wasdirected to the surface water drainage system, ultimately leading to the <br />sediment ponds. The permanently reclaimed spoils area has a designed underdrain <br />system which controls drainage, and passes any water reaching the underdrain to Carbon <br />Junctionbelow. <br />Acidic drainage wasobserved from a spring in the vicinity of the South Pit in the late <br />1990’s.This spring was a natural spring which emanatedfrom strata unaffected by coal <br />mining. This surface drainage wasmitigated in two ways; first, the drainage was <br />controlled by the sediment control system, second, the natural conditions of the earth <br />materials within the ditch neutralizethe acidic natural of the surface water within several <br />yards of the appearance of the surface water. <br />While the above addresses mitigation of impacts to surface water quality, surface water <br />quantity is likewise protected by the mining and reclamation planat the Carbon Junction <br />Mine. Surface water quantity wasnot reduced significantly by the operation, as the <br />sediment control system functionedto slow and treat surface water, not to impound it for <br />significant periods of time. <br />Quantitative data taken from springs and discharge monitoring reports over the <br />operational life of the Carbon Junction Mine verifiedthat therewasno significant impact <br />to the quantity or quality of surface water within or adjacent to the Carbon Junction Mine. <br />Ground Water <br />Ground water impacts are discussed throughout this section. The mining and reclamation <br />plan wasdesigned to minimize or alleviate impacts to the quantity and quality of <br />groundwater at and adjacent to the Carbon Junction Mine. The characteristics and <br />stratigraphy of the coal seam and overburden prevent discharges of ground water in the <br />areas of potential impact. Further, based on well monitoring up gradient, mid-mine and <br />Abridged Permit Document 5-21 Permit Renewal RN04 4/2014 <br />