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<br />Table. 1.--Statistical summmary of water-quality data for station 07097000, <br />Arkansas River at Portland, 1977 through 1985 <br /> <br />[ft3/s, cubic feet per second; DC, degrees Celsius; ~S/cm, microsiemens per centimeter at 25 degrees Celsius; <br />mg/L, milligrams per liter; NTU, nephelometric turbidity units; ~g/L, micrograms per liter; pCi/L, pico- <br />curies per liter; col/100 mL, colonies per 100 milliters; --, insufficient data to calculate statistic; <br />NA, statistic not applicable] <br /> <br />".) <br />(;::J <br />Co; .~ <br />(.. , <br /> <br />Constituent <br /> <br />Number of <br />measure- <br />ments or <br />analyses <br /> <br />..... <br />en <br /> <br />Streamflow, instantaneous (ft3/s) <br />Temperature (DC) <br />Specific conductance (~S/cm) <br />Oxygen, dissolved (mg/L) <br />pH (standard units) <br /> <br />Turbidity (NTU) <br />Nitrogen, dissolved (mg/L) <br />Nitrogen, total (mg/L) <br />Nitrite plus nitrate as nitrogen, <br />dissolved (mg/L) <br /> <br />Nitrite plus nitrate as nitrogen, 22 <br />total (mg/L) <br />Ammonia as nitrogen, dissolved (mg/L) 32 <br />Ammonia as nitrogen, total (mg/L) 20 <br />Ammonia plus organic nitrogen as 21 <br />nitrogen, dissolved (mg/L) <br /> <br />129 <br />105 <br />55 <br />53 <br />60 <br /> <br />38 <br />16 <br />21 <br />52 <br /> <br />Ammonia plus organic nitrogen as 38 <br />nitrogen, total (mg/L) <br />Phosphorus, orthophosphate, as 29 <br />phosphorus, dissolved (mg/L) <br />Phosphorus, dissolved (mg/L) 45 <br />Phosphorus, total (mg/L) 39 <br /> <br />Number of <br />measure- <br />ments <br />less than <br />detection <br />level <br /> <br />o <br />o <br />o <br />o <br />o <br /> <br />o <br />o <br />o <br />o <br /> <br />o <br /> <br />2 <br />2 <br />o <br /> <br />o <br /> <br />4 <br /> <br />1 <br />o <br /> <br />Mean! <br /> <br />782 <br />12.6 <br />440 <br />10.4 <br />NA <br /> <br />27 <br />.73 <br />.94 <br />.29 <br /> <br />.31 <br /> <br />.08 <br />.07 <br />.42 <br /> <br />.77 <br /> <br />.03 <br /> <br />.06 <br />.13 <br /> <br />Standard <br />deviation1 <br /> <br />981 <br />6.6 <br />153 <br />1.9 <br />NA <br /> <br />79 <br />.25 <br />.36 <br />.14 <br /> <br />.30 <br /> <br />.05 <br />.06 <br />.17 <br /> <br />.66 <br /> <br />.02 <br /> <br />.05 <br />.15 <br /> <br />Twenty- <br />fifth <br />per- <br />centile! <br /> <br />267 <br />6.5 <br />322 <br />8.7 <br />7.8 <br /> <br />3.0 <br />.57 <br />.72 <br />.17 <br /> <br />.14 <br /> <br />.03 <br />.02 <br />.34 <br /> <br />.50 <br /> <br />.01 <br /> <br />.04 <br />.06 <br /> <br />Median <br /> <br />416 <br />14.0 <br />450 <br />10.5 <br />8.1 <br /> <br />4.2 <br />.72 <br />.95 <br />.26 <br /> <br />.26 <br /> <br />.06 <br />.05 <br />.45 <br /> <br />.60 <br /> <br />.03 <br /> <br />.04 <br />.08 <br /> <br />Seventy- <br />fifth <br />per- <br />centile! <br /> <br />916 <br />17 .5 <br />542 <br />11.8 <br />8.3 <br /> <br />15 <br />.90 <br />1.1 <br />.38 <br /> <br />.31 <br /> <br />.12 <br />.10 <br />.50 <br /> <br />.87 <br /> <br />.04 <br /> <br />.07 <br />.14 <br />