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1. Assessed the accuracy of the State Engineer's Office well data base with <br />respect to the District. <br />2. Identified four distinct hydrostratigraphic units in the Basin that separately or <br />in combination comprise two to four aquifers depending upon location, <br />degree of separation by intervening shales, and use by individual and <br />multiple completion zone wells — Ogallala, Dakota, Cheyenne, and Dockum, <br />in descending order. <br />3. Determined the elevation and thickness of the aquifers by examination of <br />selected well records; and determined the corresponding intervals of <br />screened perforations to delineate the source aquifers(s) of each well. <br />4. Confirmed the distribution of the District's monitor wells as adequate to obtain <br />accurate water levels in the aquifers of the District. <br />5. Identified the areas of concentrated agricultural development within the <br />District that may benefit from additional management. <br />6. Quantified the actual water use in the District to predict future water -level <br />declines. <br />7. Verified the hydraulic connection between the main aquifers to quantify the <br />migration of water between the aquifers, as much as possible, using available <br />information. <br />8. Estimated the demand for future use of water in the District. <br />9. Identified the sites of known water quality contamination for future mitigation. <br />The MWE report presented an assessment of the geology in the area, history of water <br />development in the district, and associated changes in the ground water levels within the <br />District along with conclusions and recommendations for consideration by the District. <br />At the January 2001 annual meeting of the District, the Phase 1 study was accepted. At <br />that meeting the District members voted to authorize a Phase 2 study to further assess <br />and delineate the available water resources within the District. MWE was subsequently <br />contracted by the District to assess the hydrogeology and develop management strategy <br />alternatives for the District. This report addresses the findings of this third investigation. <br />11-5 <br />99-028.003\Phase 2 Report\ SHP Introduction <br />