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Ianuary 1998 Km Coal Company * 1997Annual Hydrology Report * CO Perini[ No. G80~006 ~ 13 <br />~~ <br /> <br /> <br />TABLE 5 <br />SITE AO-2A <br />HISTORIC MINE AREA ALLUVIAL WATER QUALITY DATA <br />Parameters 1993 1994 1995 1996 1997 <br />Tem 1°CI 9.8 8 7.7 8.6 9.3 <br />H Isul 8.2 7.8 7.2 6.9 7.5 <br />E.C. lumholcml @ 20°C 740 857 1033 775 638 <br />TDS 622 841 863 673 5B0 <br />SAR lin water) 2.70 2.91 2.74 2.40 1.97 <br />Calcium Idissolvedl 67 96 93 77.2 70.2 <br />Sodium Idissolvedl 104 139 130 103 80 <br />Ma nesium (dissolved) 35 52 48 39.6 34.7 <br />Potassium Idissolvedl 3 4 3 3.6 4.4 <br />Sulfate 176 269 330 193 153 <br />Chloride 10 9 12 7.3 5.5 <br />Carbonate les CaC031 0.0000 0.0000 <2 <2 <2 <br />Bicarbonate las CaC031 389 469 395 363 302 <br />Fluoride 0.5 0.3 0.4 0.45 0.4 <br />Nitrate-Nitro en Idissolvedl 0.07 1.58 4.54 5.39 0.53 <br />Iron Idissolvedl 0.07 0.05 0.27 0.49 0.22 <br />Man anese (dissolved) 0.70 0.52 0.69 0.60 0.35 <br />Aluminum Idissolvedl 0.10 <0.05 <0.05 <0.03 0.03 <br />Barium (dissolved) 0.05 0.10 0.11 0.10 0.09 <br />Boron Idissolvedl 0.08 0.09 0.13 0.13 0.18 <br />Cadmium (dissolved) <0.005 <0.005 <0.005 <0.003 <0.003 <br />Chromium Idissolvedl <0.01 <0.01 <0.01 <0.01 <0.01 <br />Co er Idissolvedl <0.01 <0.01 <0.01 <0.01 0.01 <br />Lead Idissolvedl <0.02 <0.02 <0.02 <0.02 <0.04 <br />Mercury Idissolvedl <0.0001 <0.0002 <0.0002 <0.000 <br />2 <0.0002 <br />Mol bdenum Idissolvedl <0.05 <0.01 <0.01 <0.01 <0.01 <br />Nickelldissolved) <0.02 <0.02 <0.02 <0.01 <0.01 <br />Phos horns lortho dissolved) 0.17 0.01 0.03 0.07 0.02 <br />Vanadium (dissolved) <0.01 <0.01 <0.01 <0.005 <0.005 <br />Notes: All values in mgll unless otherwise noted. <br />Well AO-2 replaced with AO-2A in January 1993. <br />All values re resent mean annual values. <br />ieiv J9l ANNU~L.RPI~HYDRO FNL TmaMatriz lne. *PO. Box 774018 *Steamboat Springs, Colorado 80477 *~970J 879626073 <br />