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and the alluvial sands of East Muddy Creek and its tributaries . <br /> • Unconsolidated sediments occur in the Coal <br /> Creek drainage . Sands and gravels derived from the Mesaverde <br /> formation, the Mancos shale and older_ units make up the Coal <br /> Creek alluvium which extends , although not continuously , <br /> from Coal Basin to the Crystal River . Coal Creek contains <br /> alluvial materials in Coal Basin; however , this material <br /> thins significantly where it flows through the water gap <br /> formed in the Grand Hogback. Consequently , two alluvial <br /> aquifer systems lie along Coal Creek to the confluence with <br /> the Crystal River . <br /> Tributaries of East Muddy Creek on the west <br /> side of Huntsman Ridge are generally intermittent on the <br /> • lease area . Slopes are steep and the streams are more <br /> erosive than depositional in character . No major alluvial <br /> aquifer exists in the tributaries of East Muddy Creek on the <br /> lease area . However , East Muddy Creek proper alluvium, in <br /> the adjacent mine area is recharged through tributaries by <br /> snowmelt . Since the lease area does not encroach upon the <br /> aquifer and no surface facilities are to be located west of <br /> Huntsman Ridge in this drainage, mining should not have an <br /> effect on the alluvial aquifer in the East Muddy Creek <br /> drainage . <br /> 5 . Regional surface water information <br /> a . introduction <br /> The Mid-Continent Coal Basin mina plan area <br /> • is located on the drainage divide that separates the North <br /> 26 <br />