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<br />TREND ANALYSIS FOR THE COLORADO AND GUNNISON RIVERS 25 <br /> <br /> <br />N <br />1" , <br />v <br />(.<-' <br />CD <br /> Table 8. Monotonic trend$ in periodic calcium, magnesium. sodium, and sulfate concentrations for gaging stations 09095500 <br /> Colorado River near Cameo, 09152500 Gunnison River near Grand Junction, and 09163500 Colorado River near the <br /> Colorado-Utah State line, Water years 1970-93 <br /> [Periods are in water years; slopes are in milligrams per liter per year; percent is the slope expressed as percent change per year; p value is the <br /> significance level of the test; 54 significance levels, which are: HS is highly significant, p is less than or equal to 0.01; S is significant. p is greater <br /> than 0.01 and less than orequal;to 0.05; MS is marginally significant, p is greater than 0.05 and less than or equal to 0.10; and NS is not significant, <br /> p is greater than 0.10; <. less than] <br /> Station Period Unadjusted concentration Flow...adJusted concentration <br /> Slope Percent p value SL Slope Percent p value SL <br /> Calcium <br /> 09095500 1970-93 0.00 0.00 0.508 NS --{I.24 --{I.38 <0.001 HS <br /> 1980-93 .48 .79 .053 MS -.21 -.35 .257 NS <br /> 1986-93 .00 .00 .918 NS -1.31 -2.10 .002 HS <br /> 09t52500 1970-93 -.47 -.47 .233 NS -.47 -.47 .014 S <br /> 1980-93 1.17 1.27 .294 NS .47 .52 .197 NS <br /> 1986-93 4.73 4.81 .098 MS -.59 -.60 .466 NS <br /> 09163500 1970-93 .00 .00 .503 NS -.37 -.39 .018 S <br /> 1980-93 .83 .92 .077 MS .10 .11 .860 NS <br /> 1986-93 .00 .00 .378 NS -1.30 -1.39 .056 MS <br /> Magnesium <br /> 09095500 1970-93 .00 .00 .963 NS -.06 -.41 .005 HS <br /> 1980-93 .00 .00 .894 NS -.19 -1.27 .008 HS <br /> 1986-93 -.40 -2.57 .001 HS -.86 -5.58 <.001 HS <br /> 09152500 1970-93 -.31 -.92 .038 S -.30 -.87 <.001 HS <br /> 1980-93 .29 .95 .382 NS -.03 -.08 .843 NS <br /> 1986-93 1.36 4.21 .127 NS -.40 -1.24 .145 NS <br /> 09163500 1970-93 -.t7 -.56 .056 MS -.27 -.88 <.001 HS <br /> 1980-93 .18 .63 .387 NS -.16 -.56 .Ill NS <br /> 1986-93 .00 .00 .915 NS -.90 -2.96 <.001 HS <br /> Sodium <br /> 09095500 1970-93 .00 .00 .388 NS -.51 -.54 <.001 HS <br /> 1980-93 1.51 1.69 .022 S -1.29 -t.44 <.001 HS <br /> 1986-93 .71 .75 .465 NS -3.96 -4.18 <.001 HS <br /> 09152500 1970-93 -.86 -1.42 .008 HS -.77 -1.27 <.001 HS <br /> 1980-93 .45 .86 .618 NS -.26 -.51 .197 NS <br /> 1986-93 3.03 5.56 .127 NS -.69 -1.27 .068 MS <br /> 09163500 1970-93 -,25 -.28 .322 NS -.54 -.60 <.001 HS <br /> 1980-93 .62 .72 .309 NS -.60 -.69 .023 S <br /> 1986-93 .00 .00 .746 NS -2.52 -2.80 <.001 HS <br />