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<br />N <br />".>.. <br />,. <br />...... <br /><J;. <br /> Table 9. Step-trend results on chloride and sodium concentrations for gaging stations 09304200 White River above Coal <br /> Creek, 09304600 White River at Meeker, and 09304800 White River below Meeker, water years 1973-92 <br /> [Mean is the mean constituent concentration in milligrams per liter; N, number of samples; periods are: PRE, prior to July 1981: TRANS. <br /> July 1981-March 1982; POSTl, April 1982-December 1984; POSTl. May 1987-September 1992; T-group, constituent means for periods with <br /> the same letter for the same station are not statistically different at the 0.01 significance level based on t~tests; W-group, periods with the same letter <br /> for the same station are not statistically different at the 0.01 significance level based on the Wilcoxon rank-sum test] <br /> Chloride Sodium <br /> Station N W-group Mean N Period T-group W-group <br /> Mean Period T-group <br /> 09304200 4.0 34 TRANS A A 5.4 34 TRANS A A <br /> 09304200 1.9 18 POSTI B B 4.4 18 POSTI B B <br /> 09304200 1.7 120 POST! B B 3.8 116 POST! B B <br /> 09304200 1.6 141 PRE B B 3.6 141 PRE B B <br /> 09304600 31.5 135 PRE A A 26.5 135 PRE A A <br /> 09304600 29.8 32 TRANS A A 25.6 32 TRANS A A <br /> 09304600 7.7 120 POST! B B 11.5 120 POST! B B <br /> 09304800 30.4 195 PRE A A 31.6 38 TRANS A A <br /> 09304800 27.5 38 TRANS A A 31.2 194 PRE A A <br /> 09304800 8.3 79 POST! B B 17.0 19 POSTI B B <br /> 09304800 7.4 19 POSTI B B 16.1 79 POSTI B B <br /> <br />Table 10. Monotonic trends in flow-adjusted mean monthly chloride and sodium concentrations for gaging <br />stations 09304200 White River above Coal Creek, 09304600 White River at Meeker, and 09304800 White <br />River below Meeker, July 1978-September 1984 <br /> <br />[Period in month and year: slopes are in milligrams per liter per year; percent is the slope expressed as percent rate of change per year; p value is the <br />significance level of the test; <, less than] <br /> <br /> Period Chloride Sodium <br />Station <br /> Slope Percent p value Slope Percent p value <br />09304200 7178-9/84 0.10 5.15 0.094 0.03 0.85 0.722 <br />09304600 7178-9/84 -4.73 -21.5 <.001 -2.43 -11.8 <.001 <br />09304800 '7178-9/83 -5.10 -21.9 <.001 -2.90 -11.0 <.001 <br />IData collected only' throogh September 1983. <br /> <br />TREND ANALYSIS FOR THE WHITE RIVER 35 <br /> <br />-',." <br />