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008 <br />6,00( <br />ILL! <br />CL <br />Z U) 5,00 <br />wZ) <br />2Fn <br />w J <br />T) w <br />U <br />(1) 4,000 <br />U w <br />—w <br />w <br />Z C7 <br />— <br />L 0 3,000 <br />U <br />N <br />Z F_ <br />�a <br />U oC <br />H 2,000 <br />Z <br />O� <br />U 1— <br />U Z <br />1Z U 1,000 <br />U <br />w <br />U) <br />0 <br />SITE <br />N pp t0 M <br />LL LL LL LL LL LNL LL LL LO <br />LL <br />0 MAXIMUM <br />75th PERCENTILE <br />• MEAN <br />MEDIAN <br />25th PERCENTILE <br />MINIMUM <br />87 NUMBER OF MEASUREMENTS <br />• <br />235 <br />2 <br />159 10 8 5119 37 87 167 <br />G a o a 12 1b 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 <br />APPROXIMATE MILES DOWNSTREAM FROM DRAINAGE BOUNDARY <br />Note: Period of record for individual sites <br />is variable. See tables 3 and 4. <br />Figure 12. -- Statistical summary of downstream variations in specific <br />conductance for Fountain Creek, available data, 1975 -83. <br />indicates that pH does not adversely affect the intended beneficial uses of <br />the stream. As an indication of the near - neutral pH measurements, the solu- <br />bility of most trace elements can be expected to be relatively small in this <br />well- oxygenated stream. However, some trace elements, such as manganese, <br />selenium, and zinc, are fairly soluble at the pH levels measured on Fountain <br />Creek. <br />During 1981, when pH was measured at site F12 and site F15, there was a <br />small.but significant (95 percent level of confidence) decrease in pH. This <br />decrease in pH, which occurred between sites F12 and F15, possibly was the <br />result of drainage from mine tailings. The pH increases downstream from site <br />F15 for a short distance as the result of inflow from Monument Creek. Down- <br />stream from site F17, the pH decreases, probably as the result of effluent <br />from the Colorado Springs Wastewater Treatment Plant and, then, gradually <br />increases throughout the remaining 47 mi of Fountain Creek. <br />25 <br />