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<br /> <br /> <br />Figure 12.--Statistical summary of downstream variations in specific <br />conductance for Fountain Creek, available data, 1975-83, <br /> <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 /> <br />During 1981, when pH was measured at site Fl2 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 /> <br />25 <br />