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^ In some areas picks defining an aquifer surface are located outside of the aquifer <br />extent. Additionally along the perimeter of the aquifer in some locations the <br />bottom pick for the aquifer is not equal to ground surface. Both of these <br />situations may indicate that the aquifer boundary should be extended. Such <br />areas may warrant further detailed investigation. <br />In Township 6S and 7S and Ranges 68W and 67W is an area of lesser sand <br />thickness to the west of an area of relatively greater sand thickness for the <br />Arapahoe Aquifer (Figure 20). This is inconsistent with the model of <br />depositional sources coming from the mountains located to the west of this area. <br />It is recommended that the net sand thickness picks from logs in this area be <br />reevaluated. <br />In some areas, the base of alluvium surfaces from the Task 42.3 TM conflict with <br />the bedrock surfaces directly underlying the alluvium. A cursory investigation <br />indicates that the current bedrock aquifer boundaries may not represent the true <br />extent of the bedrock aquifer in these areas. These areas are isolated to portions <br />of the perimeter of the aquifers' extents where they are covered by alluvial <br />deposits, and the only area with substantial disagreement is in the northeast <br />corner of the Laramie-Fox Hills Aquifer (Township 4S, Range 60W). Additional <br />investigation in these areas is warranted to consider modifying the aquifer <br />extents or reconciling the bedrock aquifer data with the base of alluvium data. <br />SPDSS Phase 2 Task 42.2 TM -Final 23 <br />2/13/06 <br />