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<br />10.0 <br /> <br />9.B <br /> <br />i <br />I <br />I <br />f <br /> <br />9.6 <br /> <br />9.4 <br /> <br />7.B <br /> <br />7.6 <br /> <br />7.4 <br /> <br />7.2 <br /> <br />7.0 <br /> <br />6.8 <br />&*,0 <br />.~ <br />" <br /> <br />101:21 i <br /> <br />* <br /> <br />(25) <br /> <br />(26) <br /> <br />* <br /> <br />* <br />* <br /> <br />o <br />Upper Arkansas River Basin <br /> <br />(25) <br />o <br /> <br />Number of observations <br />Outlier data value more than 3 limes the <br />mlerquanile range outside the quartile <br />Outlier data value less than or eQual to 3 <br />and more than 1 stJmes the <br />Interquamle range olltside the quar1lle <br />Dala value less than or ElQual 10 15tJmeSlhe <br />interQuarule range oulSlde the quanile <br />751h percentile <br />Median <br />25th percentile <br /> <br />_..~~ f;'.~0 -4f:>~ ,~\rfl <br />~. rit> ~ _,~" <br />~$~ ~ <br /> <br />* <br /> <br />~ <br /> <br />(24) <br /> <br />(26) <br />* <br /> <br />(24) <br />* <br /> <br />(24) <br /> <br />(24) <br />* <br /> <br />(25) <br /> <br />(26) (35) <br /> <br /> <br />~ . <br />. ~ <br /> <br />* <br /> <br />* <br />o <br /> <br />Lower Arkansas River Basin <br /> <br />~,~ ,4,$1-0 ~0 (l"~ ~?J.~ ~o'\ 0~O r{l.1 #fl- ~~ ~ {,',?J. ~?J.r., ~d-'" ~ <br />~~ ~~~ ~'b~ t,..cr:' ~o~ er/J ~~ ...M'b-~ ....-40 ~0q#' ~,~ Q ..;p";)..,): ,..~'1 ,,"e~ -t-.# <br />u~ o~ .,;lo'" r u" v? ~,. .If>'- <br />~"'~ ~ ~# <P~ <br />-:..o~ i1'~ G <br />~0 *~ <br />'11'''' <br /> <br />Figure 3. Variations in pH in the Arkansas River, April 199O-March 1993. <br /> <br />WATER QUALITY 9 <br />