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Upper Raven Gulch Surface Water puallty and Field Parameters • Mountain Coal West Elk Mine Monitoring Location U. Raven Gulch Baseline 2005 Water Year Oescri ti0n Units Minimum Maximum Mean 5/10/2005 6/712005 9/1912005 Field Parameters' Flow m 44880 6375 34.3 Electrical Conductivity µmhos/cm 182 241 669 H $U 7.27 7.8 6.29 Tem erature °C °C Tem erature °F °F 387 a7.6 a6.5 Comment Laborato Parameters Name of Certifie0 Lab ACZ ACZ Lab Reference # L51 DZ9-02 L51525-09 Sam le Date 5/t 0/2005 6/]12005 Lab Test Date 5/11-611 6/B-716 Sam led B Alkailnily (Total CBCO~) mgll 57 74 68 57 74 Aluminum, dissolved m /I -0.03 006 002 0.06 -0.03 Anions me /I 1.3 t.8 1.6 1.3 t.8 Arsenic, dissolved m /l Arsenic, total m /I 0.0013 0.0016 O.OOtS 0.0016 0.0013 Bicarbonate m /I 57 73 65 57 73 Boron, dissolved m /I -0.01 -0.01 -0.01 -0.01 -0.01 Cadmium, dissolved m ll -0.005 -0.005 -0.005 -0.005 -0.005 Calcium, dissolved m /l 15 19 17 14.6 19.3 Carbonate m /I -2 -2 -2 -2 -2 Cation -Anion Balance m ll -2.9 0.0 -1.5 0,0 -z.9 Cations me fl 1 2 2 1.3 1 7 Chloride m ll -1 1 0 1 -1 Conductivity µmhos/cm 133 165 149 133 165 Co er, dissolved m /l -0.01 -0.01 •0.01 -0.01 -0.01 Hardness m /I 48 62 55 48 62 H tlroxide m /1 -2 -2 -2 -2 -2 Iron, dissolved m ll 0.04 0.06 0.06 0.08 0.04 Iron, lOlal m /I 8.49 8.89 8.69 8.49 8.89 Lead, dissolved m /1 -0,04 -0.04 -0.04 -0.04 -0.04 Lead, total m ll Ma nesium, dissolved m /I 27 3.4 3.1 27 3.a Man anese, tllssolved m /1 -0.005 -0.005 -0.005 -0.005 -0.005 Mao anese, total m /l 0.185 0.193 0.189 0.185 0.193 Mercu ,total m /I -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 Mol btlenum, dissolved m /l -0.01 -0.01 -0.01 -0 01 -0.01 Nitrate as N ,dissolved m /I NitratelNitrile as N m ll -0 02 0.02 0.00 0.02 -0.02 Nitrite as N ,dissolved m /I H SU 7.8 8.3 B.t 7.8 8.3 Phos hate m /I 0.09 0.15 O.t2 0.09 015 Phos harus Ortho ,dissolved m /( 0.03 0.05 0.04 0.03 0.05 Potassium, tliss0lvetl m n 0.9 1.0 1.0 1.0 0.9 Selenium, dissolved m tl Selenium, lolal m 11 -0.001 -0.001 -0.001 -0.001 -0.001 Sodium ADSOr lion Ratio SAR talc. 0.52 0.84 0.58 0.52 0.84 Sodlum, dlsSOlvetl m!i 8.2 11.6 9.B 8.2 11.8 Sulfate m /i 10 20 15 10 20 TDS Ratio talc. 1.11 1.39 1.25 t39 1.11 TD$ Calc. m /I 72 99 e6 72 99 TDS m /I 100 110 105 100 110 7S5 m !I 234 354 294 234 354 Zinc, dissolved m /i -0.01 -0.01 -0.01 -0.01 -0.01 ACZ -ACZ Laboratories. Inc., Steamboat S rin s, CO Ne alive values denote reatlin s below lah detection levels NM - Nof Measured West Etk Mine C-18 2005 Annual Hydrology Report HydroGeo, Inc.