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• to ground water flow) and down-gradient from the well field to <br />enable a determination of the impact of mining operations on <br />ground water entering and leaving the lease tract (Plate 1, at <br />end of this document illustrates location of dedicated wells). <br />At the site of planned commercial scale mining operations, the <br />Boies bed is separated from the overlying Dissolution Surface <br />(lower most penetration of ground water ) by approximately 40 <br />feet of impermeable competent roof rock. The Dissolution <br />Surface, which is located at an approximate depth of 1885 feet, <br />forms the base o:E the lower aquifer which extends upward to a <br />depth of approximately 1580 feet (Figure 1). <br />• The upper aquifer is situated above the top of the Mahogany zone <br />which is also the top of the Leaky-Confining layer (Figure 1). <br />The Leaky-Confining layer separates the upper and lower aquifers <br />but does allow for significant hydraulic connection between the <br />two aquifer systems. The potentiometric surface of the upper <br />aquifer is slighi:ly higher than the potentiometric surface of <br />the lower aquifer, allowing ground-water to move in a downward <br />direction from upper to lower aquifer. <br />Based on data from drill hole NaTec 26-EX-2, near the site of <br />the plant/well field operations, a Perched aquifer is located at <br />an approximate depth of 400-600 feet below the surface within <br />the Uinta Formation (Figure 1). It appears as though this <br />unconfined Perched aquifer is associated with a lithologic <br />5 <br />