Laserfiche WebLink
extent of the Upper Arapahoe Aquifer along with the confining layer that separates it <br />from the underlying Lower Arapahoe Aquifer. The Denver Aquifer is by far the thickest <br />aquifer in this cross-section. <br />Cross-section F-F' (Figure 30) is oriented along Township 8S, located just south of Castle <br />Rock. In this cross-section, portions of the Upper Dawson, Lower Dawson, Denver, <br />Arapahoe, and Laramie-Fox Hills Aquifers can be found. The alluvial aquifer <br />corresponding to the upper portion of East Plum Creek is visible overlying the Lower <br />Dawson Aquifer near the western margin of this cross-section. The Upper and Lower <br />Dawson Aquifers are almost completely divided at this location. <br />Cross-section G-G' (Figure 31) is oriented across Township 12S north of Colorado <br />Springs. The Dawson, Denver, Arapahoe, and Laramie-Fox Hills Aquifers are present in <br />this transect. The Dawson and Denver Aquifers are very thick in this portion of the <br />Denver Basin. <br />4.0 Summary and Conclusions <br />CDM completed SPDSS Tasks 31 and 42, the Phase 1 and Phase 2 collection, analysis, <br />and mapping of aquifer configuration data for the bedrock aquifers in the Denver Basin <br />Region. This TM examines the data available in HydroBase and documents the analysis <br />of that data. The data were used to characterize the configuration of the Denver Basin <br />bedrock aquifers to help identify additional data needs in the Denver Basin Region and <br />to support the design of the groundwater field program. <br />Below are conclusions from the completion of the tasks. <br />^ The Task 42.1 and 42.2 activities satisfied the objectives of collecting available <br />published aquifer configuration data, enhancing HydroBase with these data, <br />guiding the Phase 2 field investigations, and helping to characterize the <br />configuration of the aquifers and net sand thickness of the bedrock aquifers in <br />the Denver Basin Region. <br />The aquifer configuration data that have been analyzed and presented in this TM <br />represent a significant addition to the knowledge and characterization of the <br />groundwater system within the Denver Basin Region. Aquifer configuration data <br />covering the entire region have not been published since the late 1980s. This <br />enhanced characterization of the bedrock aquifers, as will be reflected in the <br />Denver Basin bedrock model being developed by the USGS, helps address the <br />SB-74 Technical Committee's general recommendations on improvements to the <br />existing model. <br />^ The Phase 1 field investigations (Tasks 35.1 and 36.1) provided additional aquifer <br />configuration data for the Denver Aquifer where little or no data previously <br />existed. <br />SPDSS Phase 2 Task 42.2 TM -Final 20 <br />2/13/06 <br />