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during spring melt recharge. The water migrates vertically <br /> • through the rock debris and discharges naturally at the base <br /> of the toe of the slide area . <br /> (3) Mesaverde formation - consolidated <br /> formations <br /> Aquifers in the permit. area are defined <br /> as a formation, group of formations , or a part of a forma- <br /> tion that contains sufficient saturated permeable material <br /> to yield significant quantities of water to wells and springs . <br /> The evaluated aquifers include the Upper, Middle and Rollins <br /> Sandstone units of the. Williams Fork and Iles Formation of <br /> the Mesaverde Cretaceous aged group . Since groundwater <br /> wells have not been completed in the sandstone units the <br /> following will discuss the general charateristics of the <br /> Mesaverde Group . The Upper , Middle and Rollins sandstone <br /> units are approximately 50, 120 and 140 feet thick respec- <br /> tively The sandstones are fine to medium grained feld- <br /> spathic to quartzitic sandstones . The permeabilities are <br /> expected to range from 10-2 to 1 ft . per day with trans- <br /> missivity to range from . 5 to 150 Ft per day, with a <br /> specific yield based on an estimated porosity of .1 to range <br /> from . 05 to .07 . <br /> C . Ground water uses <br /> Mid-Continent utilizes groundwater to control <br /> fugitive dust, clean coal, and for bathing and sanitary <br /> purposes , but not for drinking water supply . <br /> 4 <br />