2009-07-01_REPORT - C1980007 (6)

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West Elk Mine 2008 Annual Hydrology Report 55 • compared to the baseline maximum of below lab detection limits (<0.01 mg/1); dissolved iron of 0.28 mg/l compared to the maximum baseline value of 0.26 mg/I; dissolved potassium of 2.74 mg/l compared to the baseline maximum of 2.0 mg/I; total selenium of 0.003 mg/l compared to below lab detection limits (<0.001 mg/1); dissolved sodium of 37.25 mg/l compared to the baseline maximum of 32.4 mg/l; TDS of 251 mg/l compared to the baseline maximum of 250 mg/I; and TSS of 63 mg/I compared to the baseline maximum of 60 mg/l. One sample plus a duplicate sample (two samples total) were collected at Lower Gribble Gulch in WY 2008. The water quality measurements above baseline values at Lower Gribble Gulch are not mining related, but included pH of 8.33 and 8.31 s.u. compared to the baseline maximum of 7.2 s.u. and TDS of 490 and 492 mg/l compared to the baseline maximum of 60 mg/l. One sample was collected at Box Canyon in WY 2008. The water quality measurements over baseline values at Box Canyon are not mining related, but included dissolved iron of 0.03 mg/l compared to the baseline maximum of 0.02 mg/l; total iron of 3.01 mg/I compared to the baseline maximum of 0.44 mg/I; pH of 7.93 s.u. compared to the baseline minimum of 8.0 s.u.; TDS of 727 mg/l compared to the baseline maximum of 620 mg/I; and TSS of 87 mg/l compared to the baseline maximum of 38 mg/1. The source of these elevated values could be due to higher than normal 40 stream flows in WY 2008. One sample was collected for analysis in WY 2008 at both Upper and Lower Raven Gulch in WY 2008. The numerous water quality measurements over baseline values observed at Upper Raven Gulch in WY 2008 are not mining related, but included dissolved aluminum of 0.11 mg/l compared to the baseline maximum of 0.06 mg/l; dissolved boron of 0.015 mg/l compared to the baseline maximum of below lab detection limits (<0.01 mg/1); dissolved calcium of 23.1 mg/l compared to the baseline maximum of 19 mg/1; chloride of 2.356 mg/l compared to the baseline maximum of 1 mg/l; conductivity of 177.85 gmhos/cm compared to the baseline maximum of 165 mg gmhos/cm /1 ; hardness of about 82 mg/l compared to the baseline maximum of 62 mg/I; dissolved iron of 0.143 mg/l compared to 0.08 mg/I; dissolved magnesium of 6.02 mg/l compared to the baseline maximum of 3.4 mg/I; pH of 7.7 s.u. compared to the baseline minimum of 7.8 s.u., dissolved potassium of 1.19 mg/l compared to the baseline maximum of 1.0 mg/I; dissolved sodium of 15.6 mg/l compared to the baseline maximum of 11.6 mg/l; TDS of 128 mg/l compared to the baseline maximum of 110 mg/I; and dissolved zinc of 0.013 mg/1 compared to below lab detection limits (<0.01 mg/1). The numerous water quality measurements above baseline values observed at Lower Raven Gulch are not mining related, but included dissolved aluminum of 0.13 mg/l compared to the baseline June 2009 HydroGeo, Inc.