2009-07-01_REPORT - C1980007 (6)

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West Elk Mine 2008 Annual Hydrology Report 65 • elevated total iron of 0.587 mg/l compared to the maximum baseline of 0.49 mg/l, and elevated pH of 8.71 s.u. compared to the baseline maximum of 8.3 s.u.; elevated dissolved potassium of 6.41 mg/1 compared to the baseline maximum of 4.1 mg/l; and elevated dissolved selenium of 0.136 mg/1 compared to the baseline maximum of 0.0030 mg/l. Well SOM 3-E had elevated ammonia of 2.89 mg/1 compared to the baseline maximum of 0.08 mg/l; elevated dissolved arsenic of 0.036 mg/1 compared to the baseline maximum of 0.0027 mg/l; elevated dissolved cadmium of 0.012 mg/1 compared to the baseline maximum of below lab detection limits (<0.01 mg/1); elevated dissolved lead of 0.006 mg/1 compared to the baseline maximum of below lab detection limits (<0.04 mg/1); elevated nitrite as N of 0.03 mg/l compared to the baseline maximum of 0.01 mg/l; elevated pH of 8.95 s.u. compared to the baseline maximum value of 8.4 s.u.; and elevated dissolved sodium of 701 mg/I compared to the maximum baseline value of 628 mg/l. There are no water quality data for Well SOM 23-H-2 because the bailer stuck and the casing is compromised. Well 96-2-2 had elevated dissolved iron of 0.38 mg/1 compared to the baseline maximum of 0.06 mg/l; elevated total iron of 45.5 mg/1 compared to the baseline maximum of 21.1 mg/l; elevated TDS of 2,920 mg/I compared to the baseline maximum of 2,830 mg/l; and elevated TSS of 144 mg/I compared to the baseline maximum of 44 mg/l. At some point prior to May 9, 2008 the well • casing for SOM-129-H was removed or fell off and runoff and precipitation water from the drainage ditch along the road flowed freely into the well, compromising both the water level and the water quality in this well. The casing was repaired before the June 6, 2008 site visit. The water quality sample for WY 2008 at SOM-129-H was collected on August 20, 2008, but the data should be considered suspect and compromised. Well RAV-4b had an elevated conductivity of 3,532.4 µmhos/cm compared to the maximum baseline value of 2,700 µmhos/cm and elevated pH of 9.03 s.u. compared to the maximum baseline of 8.9 s.u., elevated TDS of 2,239 mg/1 compared to the baseline maximum of 1,710 mg/l; and elevated TSS of 249 mg/l compared to a maximum baseline value of 192 mg/l. Well 1-11-01 had very high elevated total iron concentration of 15.69 mg/l (suspect) compared to a maximum baseline value of 0.99 mg/l. Well SOM-313 had elevated total alkalinity of 4,280.5 mg/1 compared to the baseline maximum of 2,060 mg/l; elevated ammonia of 16.99 mg/l compared to the baseline maximum of below lab detection limits (<0.01 mg/1); elevated dissolved arsenic of 0.075 mg/l compared to the baseline maximum of 0.0020 mg/l; elevated dissolved boron of 7.82 mg/l compared to the baseline maximum of 1.58 mg/l; elevated dissolved cadmium of 0.042 mg/I compared to the baseline maximum of below lab detection limits (<0.01 mg/1); elevated conductivity of 5,456.9 µmhos/cm compared to the maximum baseline value of • 3,070 µmhos/cm, elevated dissolved lead of 0.038 mg/I compared to the baseline maximum of below lab detection limits (<0.08 mg/1); elevated pH of 8.49 s.u. compared to the baseline June 2009 HydroGeo, Inc.