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Several features shown on the g <br />understanding the presence of 1, <br />Formation, with underlying uns <br />The Brushy Basin Member is a c <br />Formation and the Salt Wash M <br />in the vicinity of the mine woul( <br />overlying strata, encounter the 1 <br />towards Bull Canyon. Recharge <br />presence of the Brushy Basin Mi <br />The Summerville Formation is a <br />This confining unit restricts dow <br />Member into stratigraphically to <br />Wash Member are hydraulically <br />groundwater present in the Salt <br />and discharge at springs near thl <br />underlying Summerville Format <br />Fawn Springs is located approx. <br />area at this approximate stratigi <br />as intermittent, suggesting that <br />Wash Member. This suggests th <br />least a seasonal basis. Although <br />the Salt Wash Member may be <br />4 mine. <br />It is unknown whether the Navi <br />Sandstones hosting the Navajo <br />approximately three miles of Fa <br />1954). The entire Bull Canyon di <br />River, is mapped as an intermits <br />discharge from strata exposed ii <br />stream flow throughout the yea: <br />2.3.2 Potentially Water-Bear <br />Potentially water-bearing fractut <br />that primarily influence only the <br />extend for miles and could poter <br />focuses on identifying large scab <br />Cater (1954), because these featu <br />a larger scale. These faults are sh <br />Figure 2-1. <br />Situated between low-permeaL <br />Salt Wash Member where it is ( <br />faults. Faults are present in the <br /> <br />Hydrogeological Evaluation of Van 4 Mine <br />Geologic and Hydrogeologic Conditions <br />)logic cross-section (Figure 2-2) are important to <br />:al groundwater at the base of Burro Canyon <br />turated conditions within the Salt Wash Member. <br />nfining unit that occurs between the Burro Canyon <br />nber. Therefore, water percolating from the surface <br />be expected to migrate downward through the <br />ushy Basin member, and move laterally down-dip <br />f the Salt Wash aquifer is therefore limited by the <br />nber confining layer. <br />onfining unit that underlies the Salt Wash Member. <br />sward migration of groundwater from the Salt Wash <br />ter strata. Therefore, mine workings within the Salt <br />solated from the underlying Navajo aquifer. Any <br />Jash Member would be expected to move laterally <br />contact between the Salt Wash Member and the <br />ately 5,000 ft southwest of the Van 4 Mine affected <br />Ihic interval. The stream below the springs is shown <br />)undwater discharges only seasonally from the Salt <br />the Salt Wash Member is saturated in this area on at <br />oundwater is not reported within the Van 4 Mine, <br />crated in areas either beneath or adjacent to the Van <br />o aquifer is saturated in the area of the Van 4 mine. <br />luifer are exposed in Bull Canyon within <br />in Springs and within five miles of the Mine (Cater <br />Linage, extending to the junction with the Dolores <br />nt stream suggesting that groundwater does not <br />Bull Canyon in quantities sufficient to maintain <br />Fracture Zones <br />zones range in size from very small-scale features <br />permeability of the rock, to large-scale features that <br />ially influence groundwater flow paths. This section <br />fracture zones associated with the faults mapped by <br />es have a potential to influence groundwater flow at <br />wn on the geological map included previously as <br />y units, water would only be expected to enter the <br />osed in adjacent slopes or via conduits such as <br />ver portion of the slope on the northeastern side of <br />2-10 <br />C] <br />• <br />• <br />draft final van 4 hydrogeology report.doc