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Table 15. -- Trend - analysis <br />results of <br />selected <br />water - quality properties <br />and constituents <br />for water - quality station <br />07104000 Monument creek at Pikeview <br />[ft /s, cubic feet per second; <br />mg /L, milligrams liter; <br />NS /cm, microsiemens <br />per centimeter at 25 degrees <br />Celsius; °C, <br />degree Celsius; <br />per <br />data; *, moderately significant <br />pg /L, micrograms per liter; /100 mL, colonies <br />trend, the significance level is less <br />per <br />100 milliliters; <br />- -, insufficient <br />^*, significant trend, the significance <br />level is <br />than <br />less than or equal to 0.05 <br />or <br />equal to 0.1 <br />and greater <br />**-, <br />than 0.05; <br />significant trend, the significance level is less than or <br />equal to 0.011 <br />and <br />greater than <br />0.01; <br />very <br />Number <br />Number <br />Period <br />Number <br />Significance level <br />Trend <br />Property or constituent <br />Units <br />of <br />of <br />of <br />of <br />Adjusted <br />slope <br />values <br />censored <br />record <br />Unadjusted for serial <br />(units <br />values <br />(water ear <br />year) <br />years <br />correlation per year) <br />Instantaneous streamflow <br />Specific conductance <br />ft /s <br />/cm <br />249 <br />243 <br />0 <br />1976 -88 <br />13 <br />0.0000 <br />0.0063 <br />1.9*** <br />pH <br />NS <br />0 <br />1976 -88 <br />13 <br />0.0194 <br />0.2986 <br />4 <br />Water temperature <br />standard <br />°C <br />147 <br />244 <br />0 <br />1976 -88 <br />13 <br />0.0000 <br />0.0236 <br />0.05** <br />Dissolved oxygen <br />mg /L <br />146 <br />0 <br />0 <br />1976 -88 <br />1976 -88 <br />13 <br />0.2148 <br />0.4495 <br />0.04 <br />13 <br />0.0312 <br />0.2536 <br />0.05 <br />Dissolved chloride <br />Dissolved sulfate <br />mg /L <br />mg /L <br />104 <br />99 <br />0 <br />1977 -88 <br />12 <br />0.0005 <br />0.1280 <br />0.4 <br />00 Suspended solids <br />mg /L <br />136 <br />0 <br />3 <br />1977 -88 <br />12 <br />0.1322 <br />0.4830 <br />0.6 <br />Nitrite plus nitrate as nitrogen mg /L <br />150 <br />0 <br />1977 -88 <br />1976 -88 <br />12 <br />0.0001 <br />0.0201 <br />13** <br />13 <br />0.0000 <br />0.0022 <br />0.081^ <br />Un- ionized ammonia as nitrogen <br />Total ammonia plus organic <br />mg /L <br />mg /L <br />124 <br />99 <br />0 <br />1976 -88 <br />13 <br />0.0000 <br />0.0035 <br />0.00020 - <br />nitrogen <br />0 <br />1976 -88 <br />13 <br />0.5618 <br />0.7311 <br />0.0018 <br />Total organic nitrogen as <br />nitrogen <br />mg /L <br />95 <br />0 <br />1976 -88 <br />13 <br />0.7256 <br />0.8339 <br />- 0.0029 <br />Total phosphorus <br />mg /L <br />65 <br />1 <br />1976 -82 <br />7 <br />0.7292 <br />-- <br />0.0025 <br />Total recoverable copper <br />Total recoverable iron <br />Ng /L <br />103 <br />2 <br />1976 -88 <br />13 <br />1.00 <br />1.00 <br />0.0 <br />Total recoverable manganese <br />Ng /L <br />Ng /L <br />110 <br />110 <br />0 <br />0 <br />1976 -88 <br />1976 -88 <br />13 <br />0.0000 <br />0.0123 <br />270^* <br />Total recoverable nickel <br />Ng /L <br />23 <br />2 <br />1981 -83 <br />13 <br />3 <br />0.0071 <br />0.0780 <br />5* <br />Total selenium <br />fag /L <br />26 <br />2 <br />1976 -83 <br />8 <br />0.1138 <br />1 0.24 -0.31 <br />2 <br />-- <br />0.0 <br />Total recoverable zinc <br />5 -day biochemical oxygen demand <br />Ng /L <br />mg /L <br />107 <br />127 <br />4 <br />1976 -88 <br />13 <br />1 0.51 -0.72 <br />1 0.69 -0.83 <br />0.0 <br />Fecal streptococcus <br />/100 mL <br />48 <br />0 <br />0 <br />1976 -88 <br />13 <br />0.0002 <br />0.0638 <br />0.1* <br />1985 -88 <br />4 <br />0.0682 <br />-- <br />-0.07* <br />1 The significance level range results <br />equal to one -half the detection limit, <br />from treating the <br />censored values <br />differently: equal to the detection limit, <br />change the trend significance. <br />and <br />equal to <br />zero. Changing the treatment <br />of the censored values does <br />not <br />2 Trend slope is slope of logarithms. <br />4 4. <br />