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Table 16. -- Trend - analysis results of selected water - quality properties and constituents for water - quality station <br />07104905 monument Creek at Bijou Street at Colorado Springs <br />[ft /s, cubic feet per second; NS /cm, microsiemens <br />per centimeter at 25 degrees Celsius; °C, degree Celsius; <br />100 milliliters; - insufficient <br />C <br />O A <br />mg /L, milligrams per liter; pg /L, micrograms per <br />liter; /100 mL, colonies <br />level is less than <br />per <br />or equal <br />, <br />to 0.1 and greater than 0.05; <br />CA <br />data; *, moderately significant <br />trend, the <br />level <br />significance <br />is <br />less than <br />or equal to 0.05 <br />and greater than 0.01; ***, <br />very <br />ul <br />**, significant trend, the significance <br />significant trend, the significance <br />level <br />is less <br />than or <br />equal to 0.011 <br />Number <br />Period <br />Number <br />Significance level <br />Trend <br />Number <br />of <br />o f <br />Adjusted <br />slope <br />Property or constituent <br />Units <br />of <br />censored <br />record <br />°f <br />Unadjusted for serial <br />(units <br />values <br />values <br />(water year) <br />years <br />correlation per year) <br />Instantaneous streamflow <br />ft /s <br />100 <br />0 <br />1980 -88 <br />1980 -88 <br />9 <br />9 <br />0.0465 -- <br />0.0547 <br />1.4** <br />11* <br />Specific conductance <br />NS /cm <br />100 <br />0 <br />0 <br />1980 -88 <br />9 <br />0.0000 <br />0.05^** <br />p H <br />standard <br />°C <br />95 <br />100 <br />0 <br />1980 -88 <br />9 <br />0.3492 -- <br />0.00 <br />Water temperature <br />mg /L <br />98 <br />0 <br />1980 -88 <br />9 <br />0.1971 -- <br />-0.08 <br />Dissolved oxygen <br />Dissolved chloride <br />m L <br />g/ <br />69 <br />0 <br />1983 -88 <br />6 <br />6 <br />0.0000 -- <br />0.0000 -- <br />1.6*** <br />10*** <br />Dissolved sulfate <br />mg /L <br />69 <br />0 <br />1 <br />1983 -88 <br />1980-88 <br />9 <br />0. 1605 -- <br />-12 <br />Suspended solids <br />mg /L <br />mg /L <br />99 <br />100 <br />0 <br />1980 -88 <br />9 <br />0.0000 __ <br />0.19*** <br />Nitrite plus nitrate as nitrogen <br />%o <br />Un- ionized ammonia as nitrogen <br />mg /L <br />84 <br />0 <br />1980 -88 <br />9 <br />8 <br />-- <br />0.0305 -- <br />0.0075 <br />0.00025'^ _ 0.075*** <br />Total ammonia plus organic <br />mg /L <br />90 <br />1 <br />1981 -88 <br />nitrogen <br />mg /L <br />81 <br />0 <br />1981 -88 <br />8 <br />0.0141 <br />- 0.067^* <br />Total organic nitrogen as <br />nitrogen <br />mg /L <br />20 <br />0 <br />1980 -82 <br />3 <br />1.0000 -- <br />0.02 <br />Total phosphorus <br />/L <br />95 <br />0 <br />- 1980 -88 <br />9 <br />0.0080 _- <br />_0.6^^ <br />Total recoverable copper <br />Ng <br />Total recoverable iron <br />Ng /L <br />95 <br />1 <br />1980 -88 <br />1980 -88 <br />9 <br />9 <br />0.2818 -- <br />1 0.33 -074 -- <br />. <br />-180 <br />0.0 - -0.3 <br />Total recoverable lead <br />N g /L <br />95 <br />9 <br />0 <br />1980 -88 <br />9 <br />__ <br />0.7733 <br />- 0 7 <br />Total recoverable manganese <br />pg /L <br />95 <br />0 <br />1981 -83 <br />3 <br />0.1138 -- <br />2 <br />Total recoverable nickel <br />Ng /L <br />23 <br />Total selenium <br />N8/ L <br />23 <br />0 <br />1981 -83 <br />3 <br />9 <br />0.7518 -- <br />0.1142 __ <br />-1 <br />-2 <br />Total recoverable zinc <br />Ng /L <br />94 <br />1 <br />0 <br />1980 -88 <br />1980 -88 <br />9 <br />0.0223 _- <br />- 0.26** <br />5 -day biochemical oxygen demand <br />mg /L <br />81 <br />4 <br />1980 -88 <br />9 <br />0.3637 -- <br />0.04 <br />Fecal coliform2 <br />/100 ML <br />53 <br />49 <br />1 <br />1984 -88 <br />5 <br />0.1839 -_ <br />-0.08 <br />Fecal streptococcus <br />/100 ML <br />'The significance level range results <br />from treating the censored values differently: equal to the <br />the censored values <br />detection limit, <br />does not <br />equal to one -half the detection <br />limit, and <br />equal <br />to zero. <br />Changing the treatment <br />of <br />change the trend significance. <br />2 Trend slope is slope of logarithms. <br />