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Fgure 8-16 presents the sulfate concentrations for five 3rd White Sandstone wells. A <br />gradual increasing trend in 3rd White Sandstone well GB-2 occurred in 2003. Mining has <br />not significantly affected the sulfate concentrations in the 3rd White Sandstone near well <br />G8-2. The sulfate concentrations in well 81-03A are similar to sulfate concentrations in <br />other 3rd White Sandstone wells. The last three years of sulfate values from well P-8 have <br />gradualy decreased after a large increase over five years. The magnitude and timing of the <br />sulfate wncentrations in well P-8 indicate that this increase is due to mining. The sulfate <br />changes in wells GC-2 and GP-9 are within the natural range of wncentrations for this <br />aquifer. Fgure 8-17 presents the sulfate concentrations for wells GE-3, GLUX-1 and P-5. <br />The sulfate concentrations for both GE-3 and GLUX-1 have remained low, while the sulfate <br />concentrations in well P-5 were much larger. Well P-5 was dry in 2003. The sulfate <br />concentrations in well P-5 are natural and show that relativey high values naturaty exist in <br />this sandstone. <br />Figure B-18 presents the sulfate concentrations for wells GC-3, P-1, P-3, J-1 and <br />COY. The sulfate concentrations in alluvial well P-1 increased in 2003 after a decrease in <br />2002 but these changes are within historical natural values for this well. The sulfate <br />concentration in the Lewis Shale near this well has been consistently higher with an increase <br />in 2003. The recent increase in sulfate concentrations for Johnson Gulch well )-1 are <br />slightly higher than the natural level in the Rume Gulch aliwium at well COY but could be <br />due to the dry cyde. Sulfate concentrations in the Flume Gulch wells (GC-3 and COY) have <br />fluctuated from approximatey 400 to 1100 mg/I. <br />• <br />3-8 <br />