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West Elk Mine 2007 Annual Hydrology Report 46 <br />• <br />• <br />• <br />exceeded for the initial sample collected in August 2007 for Well 03-11-1. Subsequently a retest <br />sample was collected in October 2007 and analyzed. In the subsequent sample Well 03 -11 -1 had <br />slightly elevated conductivity of 3,050 µmhos/cm compared to the maximum baseline value of <br />2,730 µmhos/cm, carbonate of 44 mg/1 compared to a maximum baseline value of less than 2 mg/1, <br />total iron of 2.32 mg/1 compared to the maximum baseline of 0.49 mg/l, and phosphate of 0.15 mg/1 <br />compared to the maximum baseline value of 0.09 mg/l. Well SOM 3E had slightly elevated <br />dissolved boron of 1.39 mg/l compared to the maximum baseline value of 1.11 mg/1, elevated <br />carbonate of 129 mg/1 compared to the maximum baseline value of 42 mg/l, slightly elevated <br />conductivity of 2,220 µmhos/cm compared to the maximum baseline value of 2,090 µmhos/cm, <br />and elevated pH of 8.8 s.u. compared to the maximum baseline of 8.4 s.u.. Well SOM 23-H-2 had <br />slightly elevated dissolved boron value of 1.72 mg/1 compared to the maximum baseline value of <br />1.52 mg/l, elevated dissolved calcium of 14.1 mg/1 compared to the maximum baseline of 12.5 <br />mg/1, and slightly elevated hardness of 60 mg/1 compared to the maximum baseline value of 58 <br />mg/1. Well 96-2-2 had slightly elevated conductivity of 4,360 µmhos/cm compared to the <br />maximum baseline of 4,340 µmhos/cm and elevated levels of dissolved iron, 0.96 mg/1, compared <br />to the maximum baseline of 0.06 mg/l. Well RAV 4b had an elevated conductivity of 6,130 <br />µmhos/cm compared to the maximum baseline value of 2,700 µmhos/cm and elevated total iron of <br />272 mg/1 compared to a maximum baseline value of 22.5 mg/1, TDS of 4040 mg/l compared to the <br />maximum baseline of 1,710 mg/1, and pH of 9.2 s.u. compared to the maximum baseline of 8.9 s.u., <br />and elevated TSS of 2,490 mg/1 compared to a maximum baseline value of 192 mg/1. Well 1-11-01 <br />elevated total iron of 2.71 mg/1 compared to a maximum baseline value of 0.99 mg/1. Well SOM- <br />3B had an elevated conductivity of 6,370 µmhos/cm compared to the maximum baseline value of <br />3,070 µmhos/cm, total iron of 1,500 mg/1 compared to a maximum baseline value of 445 mg/1, total <br />manganese of 19.90 mg/l compared to a maximum baseline value of 4.64, dissolved potassium of <br />10 mg/1 compared to a maximum baseline value of 8.5 mg/1, pH of 8.4 s.u. compared to the <br />maximum baseline of 7.9 s.u., dissolved sodium of 1,720 mg/1 compared with the maximum <br />baseline value of 992 mg/1, boron concentrations were 3.36 mg/1 compared with the maximum <br />baseline value of 1.58 mg/1, and TDS levels were 4,360 mg/1 compared with the maximum baseline <br />value of 2,370 mg/1. Many of these values are suspect or very close to baseline values and there is <br />no apparent indication that these water quality changes are attributed to mining operations and no <br />additional changes are expected in WY 2008. <br />The shallow colluvial monitoring Well GP-4 went dry in WY 2002 and continued to be dry to <br />nearly dry throughout WY 2007. Wells GP-3 and RPE-7 went dry in WY 2004 and did not <br />rebound in WY 2007. Well RPE-1 did not have enough water to collect a sample in WY 2007. <br />June 2008 HydroGeo, Inc.