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<br />. <br /> <br />Water Chemistry: pH <br />Surface and ground water pH was> 7.0 near wells 1,3 and 4, suggesting that water has <br />been in contact with alkaline source materials, most likely Mancos Shale (Figure 9). Stream <br />water at weill (staff gauge) is similar to that at wells 3 and 4, but well 2 had a lower pH in fall <br />of 2002. <br /> <br />. <br /> <br />8.0 <br />7.5 <br />7.0 <br />:a. 6.5 <br />6.0 <br />5.5 <br />5.0 <br />1 2 3 4 <br /> <br /> <br />Well <br /> <br />Figure 9. Surface water pH at Spring Creek, October 2002. <br /> <br />Water Chemistry: Dissolved ions <br />Surface water in Spring Creek (weill) and at wells 3 and 4 had nearly identical electrical <br />conductance eTable 3), and similar concentrations ofCaH, MgH, Na+, K+, HCO) and NO). This <br />is a calcium bicarbonate type water. Well 2 had higher electrical conductance and <br />concentrations ofCa H, MgH, K+, HCO) and cl, yet no detectable NO). Thus, it appears that <br />water discharging at wells 3 and 4 contribute directly to the flow of Spring Creek. Well 2 <br />appears to be directly on decomposed Mancos Shale. <br /> <br />11 <br />