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SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> samples collected from these wells is shown in Table 10-3. Wells WS-1, WS-2, and WS-3 were <br /> completed in the lower part of the Top Rim Sandstone of the Salt Wash. Well WS-4 was <br /> completed in an underlying intermediate siltstone and mudstone unit. Well WS-1 was dry and <br /> was not sampled. <br /> The analytical data from the Denison underground wells show distinct chemical differences <br /> between the Top Rim wells and the siltstone/mudstone well. The siltstone/mudstone WS-4 well <br /> water is characterized by greater common ion constituent concentrations and an overall greater <br /> TDS concentration. Calcium, chloride, magnesium, potassium, sodium, and sulfate <br /> concentrations in well WS-4 significantly exceed concentrations in wells WS-2 and WS-3. <br /> Sulfate and TDS in well WS-4 ranged from 4,170 to 4,260 mg/L and 6,990 to 7,330 mg/L, <br /> respectively. Whereas, sulfate and TDS in wells WS-2 and WS-3 were 412 to 695 mg/L and <br /> 1,300 to 1,710 mg/L, respectively. The metals cobalt, copper, lithium, and manganese show <br /> higher concentrations in well WS-4 compared to wells WS-2 and WS-3. Arsenic (nonmetal), <br /> iron, molybdenum, selenium (nonmetal), uranium, and vanadium concentrations are significantly <br /> greater in the WS-2 and WS-3 wells compared to the WS-4 well. <br /> The radiological parameters of gross alpha and gross beta are also orders of magnitude greater <br /> in the WS-2 and WS-3 wells compared to well WS-4. <br /> 11.0 INTERPRETATION <br /> Past researchers of the regional hydrogeology have presented consistent descriptions of the <br /> area's key aquifers and confining units. The SMC area lies within or near study areas <br /> investigated by these researchers and therefore, similar hydrogeologic relationships are <br /> expected to occur in the area of the mines. Physiography (geology, hydrography, topography <br /> and climate) can greatly influence local hydrogeologic conditions and this is the case for the <br /> SMC. <br /> Underground groundwater observations, historic groundwater investigations, and the more <br /> recent groundwater monitoring program at the SMC have contributed groundwater elevation <br /> and water quality data that are used in this Section to identify local hydrogeologic processes. <br /> This information is then used to develop hydrogeologic site conceptual model in Section 12.0. <br /> Western Water& Land, Inc. 37 <br />