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are shown in Figures 25 through 31. All cross-sections have a vertical exaggeration of <br />67:1 to help illustrate the variability in thickness in the aquifers and confining layer <br />strata. <br />South to North Cross-sections <br />Cross-sections A-A' and B-B' (Figures 25 and 26, respectively) represent south to north <br />transects of the Denver Basin region at approximately one-third and two-thirds of its <br />width in Range 65W and 61W, respectively. <br />Cross-section A-A' (Figure 25) extends north from just east of Colorado Springs to the <br />vicinity of Greeley. This cross-section includes all of the Denver Basin aquifers, and <br />shows the higher elevation of the bedrock aquifers in their southern portions and their <br />northerly down-sloping nature. Near the northern end of the cross-section, the alluvial <br />aquifer is seen at two locations, corresponding to Beebe Draw and the main stem of the <br />South Platte River. Also, clearly shown are each of the bedrock aquifers and their <br />intervening confining units. In the cross-section, the undivided portions of the Dawson <br />and Arapahoe Aquifers are grouped with their respective lower members and are <br />therefore shown in the same color; their respective upper members are shown in a <br />different shade. <br />Cross-section B-B' (Figure 26) represents a south to north transect of the Denver Basin <br />region from approximately Calhan to Masters. In this portion of the basin, only the <br />Denver, undivided Arapahoe, and Laramie-Fox Hills bedrock aquifers are present. <br />There are four areas along the section line where alluvium is encountered. In the south <br />there is Big Sandy Creek, and in the north, Bijou Creek, Lost Creek, and the South Platte <br />River. <br />West to East Cross-sections <br />Five cross-sections were created to characterize the basin in the west to east orientation. <br />These cross-sections are spread across the Denver Basin approximately every three to <br />four townships. <br />The first section starts in the north with cross-section C-C' (Figure 27), oriented through <br />Township 3N. The only layers existing at this location are the alluvial aquifer, Laramie <br />formation confining layer, and the Laramie-Fox Hills Aquifer. The alluvial layer at this <br />location crosses the South Platte River main stem, as well as the alluvial aquifers of <br />Beebe Draw, Box Elder Creek, Kiowa-Bijou Creek, and Lost Creek. <br />Cross-section D-D' (Figure 28), which is oriented through Township 1S just north of <br />Denver, includes the alluvial aquifer and portions of the Denver, Arapahoe and <br />Laramie-Fox Hills bedrock aquifers and their respective confining units. The alluvium <br />along this cross-section is deeper in the Lost Creek and Bijou Creeks than it is along the <br />South Platte to the west. <br />Cross-section E-E' (Figure 29) is oriented along Township 5S immediately south of <br />Denver County. This transect contains all but the Upper Dawson Aquifer. The <br />asymmetric shape of the Denver Basin is apparent in this cross-section. Also seen is the <br />SPDSS Phase 2 Task 42.2 TM -Final 19 <br />2/13/06 <br />