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<br /> Table 1.--Statistica1 summmary of water-quality data for station 07097000, ........) <br /> Arkansas River at Portland, 1977 through 1985--Continued to <br /> ~) <br /> G') <br /> Number of <br /> Number of measure- Twenty- Seventy- <br /> Constituent measure- ments Mean1 Standard fifth Median fifth <br /> ments or less than deviation! per- per- <br /> analyses detection centile1 centile 1 <br /> level <br /> Hardness (mg/L) 56 0 176 61 130 185 220 <br /> Calcium, dissolved (mg/L) 56 0 47 15 36 50 59 <br /> Magnesium, dissolved (mg/L) 56 0 13.9 5.7 9.4 14 18 <br /> Potassium, dissolved (mg/L) 57 0 2.3 .71 1.9 2.4 2.8 <br /> Sodium, dissolved (mg/L) 56 0 22 9.7 14.5 22 28 <br /> Chloride, dissolved (mg/L) 56 0 8.2 3.6 5.0 8.6 10.5 <br /> Fluoride, dissolved (mg/L) 56 0 .5 .15 .4 .55 .6 <br />.... Sulfate, dissolved (mg/L) 56 0 99 47 66 96 130 <br />'" Alkalinity, laboratory (mg/L) 22 0 114 32 91 120 140 <br /> Alkalini ty, field (mg/L) 34 0 109 33 76 120 130 <br /> Carbonate, as calcium carbonate 15 12 1.8 5.4 <br /> (mg/L) <br /> Bicarbonate, as calcium carbonate 15 0 139 43 106 150 165 <br /> (mg/L) <br /> Silica, dissolved (mg/L) 56 0 11 2.0 9.0 11 12 <br /> Dissolved solids at 180 oC (mg/ L) 38 0 263 96 194 264 314 <br /> Dissolved solids, sum of 56 0 270 100 195 275 340 <br /> constituents (mg/L) <br /> Arsenic, dissolved (~g/L) 22 8 1.1 .7 .8 1 1 <br /> Arsenic, total (~g/L) 13 1 1.5 .7 1 1 2 <br /> Barium, dissolved (~g/L) 22 0 57 16 48 59 67 <br /> Cadmium, dissolved (~g/L) 22 15 1.4 1.1 1 1 2 <br /> Chromiwn, total recoverable (~g/L) 13 6 0 0 0 0 0 <br /> Cobalt, total recoverable (~g/L) 13 5 2.1 1.4 0 2 3 <br /> Coppe r , dissolved (~g/L) 22 2 6.2 6.2 3 3.5 7 <br /> Copper, total recoverable (~g/L) 13 1 15 14.6 7 11 16 <br />