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9 <br />Arapahoe Aquifer - The Arapahoe aquifer is the first aquifer encountered in which data is lacking <br />over a significant area (fig. 6). Significant lows in the potentiometric surface occur in eastern and <br />southern metro Denver, in the Castle Rock area and in the Monument -Palmer Lake area. These <br />lows represent drawdowns developed by municipal and irrigation wells. A trough is also <br />developing in the southernmost part of the Denver Basin near Ellicott. This trough has developed <br />as a result of the withdrawal of water for subdivision purposes. Water -level declines in the <br />Arapahoe aquifer since 1988 range from 0 to over 200 feet (fig. 7, data). The water -levels of a <br />few Arapahoe wells have risen a few feet (data). Note that the northwestern boundary of the <br />observation well network is the Broomfield fault. This fault is the southeastern boundary of the <br />complexly faulted Boulder -Weld coal field. <br />Laramie -Fox Hills Aquifer - Significant troughs in the Laramie -Fox Hills potentiometric surface <br />occur in northern, eastern and southern metro Denver, the Castle Rock -Dawson Butte area, and <br />in the Monument -Palmer Lake area (fig. 8). A trough is also forming in the southern Denver <br />Basin near Ellicott. The most significant trough trends northeastward from the Denver area and <br />parallels the Broomfield fault. Water -level declines since 1988 lie within the range from 0 to 50 <br />feet to over 300 feet (fig. 9). All of the significant declines occur in areas containing municipal <br />(subdivision) wells (data). <br />Water -level data and hydrographs for the Denver Basin observation well network are in the <br />Ap�endix. <br />Acknowledgements <br />The Colorado Division of Water Resources expresses sincere thanks to those well owners who • <br />have allowed annual access to their wells and expressed an interest in Denver Basin bedrock <br />aquifer water -level trends. Gratitude is also extended to the many water supply and distribution <br />companies which either allowed access to their wells or furnished water -level measurement data. <br />0 <br />0 <br />E <br />4109R.sav - 2 - 0 <br />