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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 Junction <br />Mine. Surface water quantity is not reduced significantly by the operation, as the <br />sediment control system functions to slow and treat surface water, not to impound it for <br />significant periods of time. <br />Quantitative data taken from springs and dischazge monitoring reports over the <br />operational life of the Cazbon Junction Mine verify that their has been no significant <br />impact to the quantity or quality of surface water within or adjacent to the Cazbon <br />Junction Mine. <br />Grouud Water <br />Ground water impacts are discussed throughout this section. The mining and reclamation <br />plan has been designed to minimize or alleviate impacts to the quantity and quality of <br />groundwater at and adjacent to the Carbon Junction Mine. The chazacteristics and <br />stratigraphy of the coal seam and overburden prevent dischazges of ground water in the <br />areas of potential impact. Further, based on well monitoring up gradient, mid-mine and <br />down gradient, no significant impacts to groundwater quantity or quality have been <br />identified or substantiated during the operational life of the Carbon Junction Mine. <br />Probable Hydrologic 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 Cazbon 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 />TR08, TRl l (v 1.0) 5-48 Revised 9/97, 8/02 <br />