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regarding site specific characteristics of water rights , <br /> alluvial valley floors , and water uses is presented in <br /> Section E of this Chapter . <br /> b . Aquifers in the coal basin region . <br /> The aquifers within the study area are the <br /> Upper sandstones associated with the Placita coal seam, <br /> tiliddle sandstones associated with the Middle coal seam, the <br /> Rollins sandstones associated with the "B" coal seam and the <br /> shallow alluvium. <br /> Table III-C-2 lists the bedrock units in the <br /> Coal Basin region and their ground water use based on regional <br /> data throughout the Crystal River Valley and the Glenwood <br /> Springs area (Brogden & Giles , 1976) . The alluvium is <br /> regionally used as a primary source of ground water , especially <br /> in the larger valley fill areas of the Crystal River and the <br /> Roaring Fork River . The extensive basalt flows north of the <br /> Coal Creek drainage are also used as a primary source of <br /> ground water , especially in the Missouri Heights area , north <br /> of the Colorado River . <br /> Within the Coal Basin area , the only <br /> geologic units potentially affected by mining are the <br /> alluvial stream deposits and the Mesaverde formation. The <br /> Wasatch formation outcrops west of the mine within the mine <br /> adjacent area . <br /> In 1959 , 'Mid-Continent undertook a drilling <br /> program to determine coal reservas in the lease area west of <br /> 16 <br />