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I . Probable Hydrologic Consequences <br /> The protection of the hydrologic balance is outlined in permit <br /> Section 2.05.6, pages 202(f)-223. This permit section addresses <br /> possible impacts due to mine subsidence , possible impacts due to <br /> mine water discharge , and effects related to surface disturbance. <br /> Possible hydrologic impacts due to construction of coal refuse <br /> piles are also discussed in this document. The permittee ' s <br /> statement of hydrologic effects has been reviewed by the Division <br /> for compliance with Rule 4.05. 1 and 2 .05.6(3) . <br /> Surface Water <br /> Surface Water Quantity <br /> Possible hydrologic impacts on quantities of surface water due to <br /> the Roadside and Cameo Mines include impacts to: <br /> 1 . Quantity of flow in the Colorado River, <br /> 2. Quantities of flow in Rapid and Cottonwood Creeks , <br /> 3. Surface seeps and springs above the Roadside Mine , <br /> 4. Dams and reservoirs above the Roadside Mine, and <br /> 5. Impacts due to water consumption by mine operations . <br /> 1 . The permittee states that approximately 0.47 cfs of mine <br /> discharge water is added to the Colorado River, increasing the <br /> flow by an average of 0.01 percent. Most of the water pumped <br /> from the Cameo Mine ultimately comes from the Colorado River by <br /> way of aquifers which subcrop below the alluvium of the river . <br /> In addition, the water pumped from the Roadside Mine would <br /> naturally contribute to base flows in the Colorado River <br /> through aquifer discharges to the river. Therefore , the mining <br /> operation should have an insignificant effect on the quantity <br /> of water in the surface and ground water systems of the <br /> Colorado River . <br /> 2 . Monitoring of both Cottonwood and Rapid Creek since 1985 has <br /> shown minimal disturbance due to subsidence. Both creeks have <br /> infrequent flow patterns . Cottonwood Creek, although a major <br /> tributary to Rapid Creek, is dry by late summer . Rapid Creek <br /> is intermittent in nature. Where surface cracking was <br /> observed , within a year the crack was refilled with sediment <br /> from the creek channel . Minor ponding has also been observed <br /> to have taken place in the subsided areas . This ponding was <br /> for a relatively short period and has disappeared . Monitoring <br /> indicates that little surface flow has been lost due to <br /> subsidence in the Rapid Creek Basin . <br /> 3. Twenty-five springs have been located in the Rapid Creek <br /> Basin . All of these springs are outside the subsidence angle <br /> of draw. None of the springs overlie present or planned <br /> underground mine workings . Mining will not effect the native <br /> natural springs . <br /> -24_ <br />