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Table 13. -- Trend - analysis results of selected water - quality properties and constituents for <br />water - quality station 07103747 Monument Creek at Palmer Lake <br />[ft /s, cubic feet per second; NS /cm, microsiemens per centimeter at 25 degrees Celsius; °C, degree Celsius; <br />mg /L, milligrams per liter; pg /L, micrograms per liter; /100 mL, colonies per 100 milliliters; - -, insufficient <br />data; *, moderately significant trend, the significance level is less than or equal to 0.1 and greater than 0.05; <br />**, significant trend, the significance level is less than or equal to 0.05 and greater than 0.01; ***, very <br />significant trend, the significance level is less than or equal to 0.01] <br />Dissolved chloride <br />mg /L <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 />12 <br />Adjusted <br />slope <br />-0.1 <br />M Un- ionized ammonia as nitrogen <br />values <br />censored <br />record <br />1977 -88 <br />Unadjusted <br />for serial <br />(units <br />0.00010 <br />Total organic nitrogen as <br />mg /L <br />values <br />(water year). <br />y ears <br />5 <br />correlation <br />per year) <br />Instantaneous streamflow <br />ft /s <br />209 <br />0 <br />1977 -88 <br />12 <br />0.0000 <br />0.0829 <br />0.1* <br />Specific conductance <br />NS /cm <br />206 <br />0 <br />1977 -88 <br />12 <br />0.0000 <br />0.0244 <br />-3^* <br />pH <br />standard <br />95 <br />0 <br />1977 -88 <br />12 <br />0.0000 <br />0.0497 <br />0.05** <br />Water temperature <br />°C <br />209 <br />0 <br />1977 -88 <br />12 <br />0.4036 <br />0.4884 <br />-0.03 <br />Dissolved oxygen <br />mg /L <br />94 <br />0 <br />1977 -88 <br />12 <br />0.3072 <br />•0.5638 <br />0.04 <br />Dissolved chloride <br />mg /L <br />83 <br />0 <br />1977 -88 <br />12 <br />0.1541 <br />0.4035 <br />-0.056 <br />Dissolved sulfate <br />mg /L <br />78 <br />0 <br />1977 -88 <br />12 <br />0.0103 <br />0.1377 <br />-0.1 <br />M Un- ionized ammonia as nitrogen <br />mg /L <br />59 <br />0 <br />1977 -88 <br />12 <br />0.2896 <br />0.5018 <br />0.00010 <br />Total organic nitrogen as <br />mg /L <br />32 <br />0 <br />1984 -88 <br />5 <br />0.1614 <br />-- <br />-0.032 <br />nitrogen <br />Total recoverable copper <br />pg /L <br />65 <br />5 <br />1978 -88 <br />11 <br />1 0.12 -0.25 <br />1 0.14 -0.30 <br />-0.1 <br />Dissolved iron <br />pg /L <br />54 <br />0 <br />1984 -88 <br />5 <br />0.9340 <br />-- <br />0.0 <br />Total recoverable iron <br />Ng /L <br />68 <br />0 <br />1977 -88 <br />12 <br />0.5874 <br />0.7331 <br />10 <br />Dissolved manganese <br />Ng /L <br />56 <br />3 <br />1984 -88 <br />5 <br />1.00 <br />-- <br />0.0 <br />Total recoverable manganese <br />Ng /L <br />68 <br />0 <br />1977 -88 <br />12 <br />0.0626 <br />0.0258 <br />1 <br />5 -day biochemical oxygen demand <br />mg /L <br />79 <br />0 <br />1977 -88 <br />12 <br />0.9623 <br />0.9787 <br />0.0 <br />Fecal streptococcus <br />/100 ML <br />47 <br />0 <br />1985 -88 <br />4 <br />0.0100 <br />-- <br />- 0.3^^* <br />'The significance level range results <br />from <br />treating <br />the censored values <br />differently: equal <br />to the detection limit, <br />equal to one -half the detection <br />limit, and <br />equal <br />to zero. <br />Changing the treatment <br />of the censored values does <br />not <br />change the trend significance. <br />2 Trend slope is slope of logarithms. <br />• <br />