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• conditions of the earth materials within the ditch neutralize the acidic natural of the <br />surface water within several 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 plan at the Cazbon <br />Junction Mine. Surface water quantity is not reduced significantly by the operation, as <br />the sediment control system functions to slow and treat surface water, not to impound it <br />for significant periods of time. <br />Quantitative data taken from springs and discharge monitoring reports over the <br />operational life of the Carbon Junction Mine verify that their has been no significant <br />impact to the quantity or quality of surface water within or adjacent to the Carbon <br />Junction Mine. <br />Ground Water <br />Ground water impacts aze discussed throughout this section. The mining and <br />reclamation plan has been designed to minimize or alleviate impacts to the quantity and <br />quality of groundwater at and adjacent to the Carbon Junction Mine. The <br />characteristics and stratigraphy of the coal seam and overburden prevent dischazges of <br />ground water in the areas of potential impact. Further, based on well monitoring up <br />• gradient, mid-mine and down gradient, no significant impacts to groundwater quantity <br />or quality have been identified or substantiated during the operational life of the Cazbon <br />Junction Mine. <br />Probable Jfydrnlogic Consequences <br />During the re-permitting of the mine in 1993, it was concluded that impacts to the <br />hydrologic balance would be minimal due to the mitigative measures the company <br />planned. The only significant change to the existing conditions at the mine since that <br />finding has been the mining of sand and gravel under a permit issued by the Division <br />under the Colorado Mined Land Reclamation Act (CRS 34-32-101 et seq). The <br />subsequent mining of sand and gravel at the site has increased the acreage of surface <br />disturbance by approximately 33 acres. This acreage is less than the total amount <br />proposed to be disturbed by the Carbon Junction operation at buildout. The sand and <br />gravel operations are conducted within the proposed disturbed area of the coal mine and <br />minimize impacts to the surface water regime through the use of the same sediment <br />control technology as the coal mine. Groundwater impacts from the sand and gravel <br />operation aze not anticipated as the operation is mining dry alluvial terrace gravels. <br />Therefore, the predictions of the PHC remain valid. <br /> <br />Technical Revision O8 (v 1.4) 5-35 Revised 9/1997 <br />