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Lower Raven Gulch Surface Water Quality and Field Parameters `J Mountain Coal West Elk Mine Monitoring Location L. Raven Gulch 8asellne 2005 Water Year Descri lion Unifs Minimum Maximum Mean 5/70!2005 61711005 9/19/2005 Field Parameters' Flow m NA 7535 16.9 Electrical Conductivity µmhos/cm 165 258 536 H SU 7.27 7.72 8.29 Tem eralure °C °C Tem efalUfe °F °F 38.7 46.4 50.3 Comment Laborato Parameters Name of Certified lab ACZ ACZ Lab Reference # L5102s-01 L51525-10 Sam le Date 5/t0/2005 fi/7/2005 Lab Test Date 5n3-b11 8/13-7/s Sam led B Alkalinity (Total CaCO~) mg/I 58 76 67 sa 7s Aluminum, tlissolved m I -0.03 O.DS 0.01 0,05 -0.03 Anions me !I 1.8 L7 1 7 7 6 1.7 Arsenic, tlissolvetl m ll Arsenic. total m ll 0.0009 0.0012 0.0011 0.0009 0.0012 Bicarbonate m ll 58 76 67 58 76 Boron, dissolved m ll -0.01 -0.01 -0.01 -0.01 -0.01 Cadmium, tlissolved m /I -0.005 -0.005 -0.005 -0.005 -0.005 Calcium, tlissolved m /I 15 20 18 15.3 19.8 Carbonate m /I -2 -2 -2 -2 -2 Cation - Anion Balance m /1 0.0 2.9 1.5 0.0 2 9 Cations me /I 2 2 2 t.6 t.8 Chloride m l -1 t D t -t Conductivity µmhos/cm 745 770 15B 145 170 Co er, tlissolved m /l -O.ot -0.01 -O.Dt -0.07 -0.01 HartlneSS m /I 51 64 58 57 64 H tlroxide m !I -2 -2 -2 -2 -2 Iron, dissolvetl m /1 0.05 0.10 0.06 0.10 0.05 Iran, lOlal m /I 7.88 9.04 8.46 7.88 9.04 Leatl, dissolved m /I -0.04 -0.04 -0.04 -O.o4 -0.04 Lead, total m /I Ma nesium, tlissolved m /I 3.0 3.5 3 3 3.0 3.5 Man anese, dissolved m /I -0.005 O.o0s D.oD1 o.o0s -0.005 Man anese, total m /1 0.168 0.792 0.180 0.168 0.192 Mercu ,total m /I -0.0002 -0.0002 -0.0002 -0.00112 -0.0002 Mol bdenum, dissolved m /I -O.D7 -0.01 -0.01 -0.01 -0.07 Nitrate as N ,dissolved m ll NilralelNitrile as N m /I -0.02 0.02 0.00 0.02 -0.02 Nitrite as N ,dissolved m /1 H SU 7.8 8,3 8.1 7.8 g.3 Ph05 hale m /I 0,09 0.18 0.14 0.09 0.18 Pnos horns Ortho ,dissolved m 0 0.03 O.D6 0.05 0 03 0.06 Potassium, tlissolved m /1 0.9 1.1 1.0 a o.9 Selenium, dissolved m /l Selenium, total m /I -0.001 -0.001 -0.001 -0.001 -0.001 Sodium Absor Lion Ratio SAR talc. 0 s5 0.87 0.73 0.81 O.fiS Sodium, dissolved m /I 11.8 13.2 12.5 73.2 11.8 Sulfate m /I t0 20 15 10 10 TDS Ratio talc. 1.24 1.30 1.27 1.24 1.30 TDS CaIL. m fl 89 92 91 89 92 TDS m /l 110 120 115 110 120 TSS m /I 1B6 296 241 186 296 Zinc, dissolved mgA -0.01 -0.01 -0.07 -O.ot -o.ot ACZ -ACZ Laboratories, Inc., Steamboat S rin s, CO Ne alive values tlenote readin s below lab detection levels NM - Noi Measured West Elk Mlne C-19 2005 Annual Hydrology Report HydroGeo, Inc.