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Lower Raven Gulch Surface Water ~uallty and Field Parameters C~ Mountain Coal West Elk Mlne Monitoring Location L. Raven Gulch Baseline 2005 Water Year DesCri lion Unlta Minimum Maximum Mean 5/10/2005 6/7/2005 9/19/2005 Field Parameters' Flow m NA 7535 164 Elerlrical Conducfivity µmhos/cm 785 258 536 H SU 7.27 772 8.29 Tem erature °C °C Tem erature °F °F 387 48.4 50.3 Comment Laborato Parameters Name of Certifed Lab ACZ AGZ Lab Reference # L51029-01 L51525-10 Sam IB Date 5/1 Dr2005 6/7/2005 Lab Tesl Date 5/13-6/1 6/13-7/6 Sam led 8 Alkalinity (Total CaC03) mg/1 58 76 67 58 7fi Aluminum, dissolved m /1 -0.03 0.05 0.07 0.05 -0.03 Anions me /I L6 t.7 1.7 t6 1.7 Arsenic, dissolved m A Arsenic, Iolal m /1 0.0009 0.0072 0.0011 0.0009 0.0012 Bicarbonate m /I 58 76 67 58 76 Boron, dissolved m /I -0.01 -0.01 -0.01 -0.01 -0.01 Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 -0.005 Calcium, dissolved m /l t5 20 18 15.3 19.8 Carbonate m /1 -2 -2 -2 -2 -2 Cation -Anion Balance m /I 0.0 2.3 1.5 Ro z.9 Cations me /I 2 2 2 1.6 1.8 Chloride m /I -1 t o 1 -1 Conductivity µmhOS/Cm 145 170 158 195 170 Co er, dissolved m /l -001 -0,01 -0.01 -0.01 -0.01 Hardness m /I 51 64 58 51 64 H droxide m A -2 -2 -2 -2 -2 Iron, dissolved m /I 0.05 0.10 0.08 0.10 0.05 Iron, Iolal m /I 7.88 9.04 8.46 7.88 9.04 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 -0.04 Lead, total m /I Ma nesium, dissolved m /I 3.0 3.5 3.3 3.0 3.5 Man anew, dissolved m 11 -0.005 0.006 0.007 0.006 -0.005 Man anew, 10[01 m /I 0.168 0.192 0.180 O.t68 0.192 Mercu ,total m /I -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 Mol btlenum, dissolved m /1 -0.01 -O.Ot -0.07 -0.01 -0.01 Nitrate as N ,dissolved m /I Nitrate/Nitrite asN m /I -0.02 002 0.00 0.02 -0.02 Nitrite as N ,dissolved m P H $U 7.8 8.3 8.1 7.8 8.3 Phos hate m ll 0.09 0.18 0.14 0.09 0,18 Phos hOrus Ortho ,dissolved m /I 0.03 0.08 0,05 0.03 0.06 Potassium, dissolved m /1 0.9 1.1 1.0 1.1 0.9 Selenium, dissolved m /I Selenium, total m ll -0,001 -0,001 -0.001 -0.001 -O.OOt Sodium Absor lion Ratio SAR talc. 0.65 0.81 0.73 0.81 0.65 Sodium, dis Solved m /I 11.8 13.2 12.5 13.2 11.8 Sulfate m ll to 20 is zo 10 TDS Ratio Calc. 1.24 1.30 t.27 1.24 1.30 TDS Calc. m /I 89 92 91 89 92 TDS m /I 110 120 115 110 120 7SS m h t88 296 241 186 296 Zinc, dissolved mg/1 -0.01 -0.01 -0.01 -0.01 -0.01 ACZ •ACZ Laboratories, Inc., Steamboat S do s, CO Ne alive values denote readin s below lab detection levels NM -Not Measured West Elk Mlne C-19 2005 Annual Hydrology Report Hyd~oGeo, Jnc.