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• <br />POWDF. R IIORN COAL COMPANY <br />TABLE 7-9 <br />COLORADO RIVER WATER QUALITY <br />DATE 10/17 11/14 12/05 01/26 03/15 04/06 05/16 06/20 07/24 08/24 <br />Time 1200 1100 1400 1170 1330 1100 1245 1330 1200 1330 <br />Streamflow Instantaneous (CFS) 1620 1320 1560 II40 1740 2600 7970 14900 5000 1920 <br />Specific Conductance (Micromhos) 1120 1200 1360 1320 1180 850 450 290 600 1025 <br />PH (units) 7.8 7.2 7.4 7.7 8.2 8.2 8.0 8.0 8.2 8.4 <br />Temperature (degree C) 10.5 4.0 5.0 .5 7.5 11.5 15.0 14,0 20.0 20.5 <br />Oxygen, dissolved (mg/L) 9.4 10.8 11.2 12.2 10.6 8.9 7.0 8.0 8.4 7,8 <br />Ila rdness, (mg/L as CaCO ) 270 340 310 700 300 240 160 Il0 180 270 <br />Ilardness noncarbona to (mg/L as CaC0 <br />) 130 170 160 150 160 110 58 30 60 120 <br />3 <br />Calcium, dissolved (mg/L as Ca) 75 95 87 85 82 67 46 72 52 79 <br />Magnesium, dissolved (mg/L as Mg) 19 24 23 22 22 18 12 6.5 11 17 <br />Sodium, dissolved (mg/L as Na) 140 160 <br />' 160 17U 150 88 74 IB 57 130 <br />Sodium Ad so.r ption Ral io 3.7 3.8 .7.9 4.3 3.8 2.5 1.2 .8 1.9 3.5 <br />Potassium, dissolved (mg/L as K) 4,7 5.0 4.7 4.8 4.4 3.5 2.6 1.3 2.4 4.1 <br />Bicarbonate (mg/L es NCO ) 170 200 190 190 170 160 130 94 140 180 <br />Carbonate (mg/L as CO ) 3 0 0 0 0 0 0 0 0 0 1 <br />Alkalinity (mg/L es CaCO ) 140 160 160 160 140 130 110 77 110 150 <br />Sulfate, dissolved (mg/L3as SO <br />) 160 200 180 180 180 130 74 35 85 150 <br />G <br />Chloride, dissolved (mg/L as CI) 200 240 220 230 200 110 78 24 79 100 <br />Fluoride, dissolved (mg/L as F) .3 .3 .3 .J .4 ,4 .2 .l .2 .7 <br />Silica, dissolved (mg/L as Si0 <br />) 6.3 7,9 7,9 8.6 B.l 10.0 9.5 7.7 7.9 9.5 <br />2 <br />Sum of constituents, dissolved (mg/L) 689 831 777 796 732 508 282 171 364 660 <br />Solids, dissolved (tons/ac-Et) .94 1.13 1.06 1.08 1.00 .69 .38 .23 .50 .90 <br />Solids, dissolved (tons/day) 3010 2960 3270 2450 2650 3840 6070 6880 4910 3420 <br />Nitrogen, NO NO dissolved (mg/L as N) <br />2 .00 .09 .12 ,29 .28 .46 .39 .ll .04 .02 <br />Phosphorous, <br />dissolved (mg/L as P) .00 .Ol .00 .03 .00 .01 .00 .OI .00 .00 <br />Iron, dissolved (mg/L as Fe) 50 10 10 20 30 10 10 20 30 - <br />Manganese, dissolved (mg/L as Mn) 20 20 20 20 ]0 10 40 10 0 20 <br />SOURCE: United S[a[es Geological Survey, Water Resources Division, 1978 <br />SOURCE: COAL MINE PERMIT APPLICATION, VOLUME I, 2/81 <br />