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the recharge project, and 3) define the impacts of the recharge operation on wildlife <br />habitat on the SWA, and physical structures on or near the SWA. A brief discussion of <br />the general site characterization, model description, and preliminary results are presented <br />in the following sections. Detailed descriptions of project elements are included in <br />separate Technical Memorandums. Table 1 describes these memorandums. <br />General Site Characterization <br />As part of model development, 149 groundwater wells were identified, 88 well logs were <br />reviewed and 10 cross - sections were constructed. Based on the analysis of this data the <br />following general interpretations were made: <br />An old river channel is evident on the west site of the model area. This channel is <br />located south of the current South Platte River below the Sand Hills. At the east <br />end of the study area this old river channel aligns with the current Platte River. <br />Figure 1 provides simplified cross - sections highlighting the basic channel <br />configuration. <br />• The alluvial aquifer can be divided into two layers; 1) the top layer consisting <br />primarily of sands; and 2) the lower layer consisting primarily of gravels. The <br />base of the aquifer is easily identified either as clay, brule or shale on the geologic <br />logs. <br />In addition, a detailed library search was conducted and a summary of published and <br />unpublished aquifer parameters was compiled. Past aquifer testing indicates a range of <br />hydraulic conductivity values from 50 to 200 meters /day (150 to 700 feet /day) and a <br />range of specific yield values from 0.1 to 0.2. <br />Figure 1- Schematic Cross - Sections of Tamarack SWA <br />TABLE 1 <br />TECHNICAL MEMORANDUM DESCRIPTIONS <br />Page 2 of 6 <br />