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<br />- . ~-- <br />~l.j~ ~.; <br /> <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 me mean constituent concentration in milligrams per liler; N, number of samples; periods are: PRE, prior 10 July 1981; mANS, <br />July 1981-March 1982; POSTI. April1982-December 1984; POSTI, May 1987-Seplember 1992; T-group, conSlilUent means for periods with <br />the same letter for the same slation are nol Slatistically dIfferent althe 0.01 significance level based on I-tests; W-group, periods wilh the same letter <br />(or ll1e same station are not statistically differenl at me 0.01 significance level based on me Wilcoxon rank-sum lest) <br /> Chloride Sodium <br />Station <br /> Mean N Period T-group W-group Mean N Period T-group W-group <br />09304200 4.0 34 TRANS A A 5.4 34 TRANS A A <br />09304200 1.9 t8 POSTI B B 4.4 18 POSTI B B <br />09304200 1.7 120 POST I B B 3.8 116 POST I 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 I B B 11.5 120 POST I 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 Iiler per year; percent is the slope expressed as percent rate of change per year; p value is the <br />significance level of the lesl; <, less Ihan] <br /> <br /> Chloride Sodium <br />Stetlon Period Slope Slope <br /> Percent p value Percent p value <br />09304200 7n8-9/84 0.10 5.15 0.094 0.03 0.85 0.722 <br />09304600 7n8-9/84 -4.73 -21.5 <.001 -2.43 -11.8 <.001 <br />09304800 17n8-9/83 -5.10 -21.9 <.001 -2.90 -11.0 <.001 <br />IOala collected only Ihrough Seplember 1983. <br /> <br />TREND ANALYSIS FOR THE WHITE RIVER 35 <br />