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26 Water-Quality Characteristics and Ground-Water Quantity of the Fraser River Watershed, Grand County, Colorado, 1998-2001 <br /> <br />^^?? l <br />1?f (' ?abe na? <br /> <br />4 ? <br />?F <br />• <br />1 <br />• <br />% <br />I _ <br />j • <br />I <br />• <br />rrr i ? ? <br />• • •..? • .•: f•. ? ?. 00 EXPLANATION <br /> <br />Aquifer thickness = 0 to 50 feet <br />Aquifer thickness = 50 to 100 feet <br />- - - 50-foot aquifer depth contour line <br />• Well locations from Colorado Division of <br />Water Resources <br />0 1 <br />0 1 <br />2 MILES <br />2 KILOMETERS <br />Figure 14. Extent and depth of the alluvial aquifer in the upper Fraser River watershed. <br />cates that the formation acts as a confined aquifer with little or <br />no hydrologic communication with the alluvial aquifer. Litho- <br />logic logs of wells installed in the area were obtained from the <br />Colorado Division of Water Resources and were tabulated to <br />infer physical properties of the Troublesome Formation aquifer. <br />Lithologic logs were examined for 162 wells drilled from 80 to <br />600 ft below land surface, which were either completed in or <br />drilled through the Troublesome Formation. Well depth, over- <br />burden thickness, total thickness of water-bearing units, and <br />total thickness of nonwater-bearing units in the Troublesome <br />Formation aquifer were tabulated from the logs. Wells were <br />grouped by township-range-section location, and results were <br />averaged for each section that overlies the Troublesome Forma- <br />tion. A maximum of 16 well logs was used to characterize the <br />Troublesome Formation aquifer in each section. Some sections <br />had no wells completed in the Troublesome Formation. Further