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. Sulfate concentrations in well GMP-1 have been highly variable but showing no long-term <br />trend. The water level in well GMP-1 had been steadily increasing for several years prior to <br />becoming fairly steady in 2002. The second value for 2005 significantly decreased. Sulfate <br />concentrations may stay variable even with the steady water level. Sulfate concentrations in this well <br />should be influenced by the sulfate concentrations in the backfill aquifer upgradient of GMP-1. The <br />sulfate concentrations in well GP-3 had shown a gradual increasing trend but concentrations have <br />been steady the last three years. Overall steady sulfate concentrations have been observed in well <br />GP-7. Sulfate concentrafions in eastern HI aquifer well GC-1 have been simflaz to the higher values <br />in well GMP-1 and had to be natural until the last few years. Therefore, a sulfate concentration of at <br />least greater than 600 mg/1 is needed to indicate that the increases may be due to the mining <br />operation. The 2005 value increased to a level neaz this value in 2004. <br />Figwe B-14 presents the sulfate concentrations for fow 3rd White Sandstone wells. The <br />sulfate concentrations in well 81-03A are similaz to sulfate concentrations in other 3rd White <br />Sandstone wells. The last five years of sulfate values from well P-8 have gradually decreased after a <br />large increase over five years. The magnitude and timing of the sulfate concentrations in well P-8 <br />indicate that this increase is due to mining. The sulfate changes in wells GC-2 and GP-9 are within <br />the natural range of concentrations for this aquifer. Figure B-15 presents the sulfate concentrations <br />for wells GE-3, GLUX-1 and P-5. The sulfate concentrations for both GE-3 and GLUX-1 have <br />remained low. Well P-5 was dry the last fow years. The sulfate concentrations in well P-5 aze <br />natural and show that relatively high values naturally exist in this sandstone. <br />Figure B-16 presents the sulfate concentrations for wells GC-3, P-1, P-3, J-1 and COY. The <br />sulfate concentrations in alluvial well P-1 were steady in 2005 after varying over the last few yeazs at <br />• Trapper Mining Company <br />2005 Annual Report <br />