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events will contribute to the recharge of the aquifer to a <br /> lesser degree . Numerous small tributaries to Coal Creek, <br /> fed by snowmelt and precipitation events , cross the outcrops <br /> of the sand units of the Mesaverde also provide additional <br /> recharge. <br /> In the vicinity of the Coal Basin Mine , water <br /> entering the Mesaverde aquifers migrates generally down-dip <br /> to the west and northwest towards the Piceance Basin . <br /> Permeabilities in the three sand units are expected to range <br /> -2 <br /> from 10 to 1 ft/day . The transmissivities of the three <br /> 2 <br /> units are expected to range from 0 . 5 to 150 ft . /day . The <br /> coals in the region do not constitute potential aquifers <br /> because they are generally tight , poorly fractured , and <br /> • unburned . <br /> Most storage in the competent, well cemented <br /> sands of the Mesaverde formation will be in intergranular <br /> cavities , although storage will also occur in joints and <br /> fractures . The intergranular cement fills and reduces the <br /> porosity of the formation to about 10% with an expected <br /> specific yield , or about 5 - 7% . <br /> The Mesaverde Formation regionally dips to <br /> the west and north in a large synclinal feature . Mesaverde <br /> coal outcrops in the Grand Hogback , and is located in the <br /> Somerset and Paonia areas , along the south and west faces of <br /> Grand Mesa north to the Book Cliffs . Overall ground water <br /> movement is to the north and west , towards the axis of the <br /> 24 <br />