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<br /> <br />Nole. Penod 01 record IOf indllJidua! sites <br />is variable. See fables .3 and 4. <br /> <br />Figure 14.--Statistica1 summary of downstream variations in pH for <br />Fountain Creek, available data, 1975-83. <br /> <br />Five-Day Biochemical Oxygen Demand <br /> <br />The BODs measurements made on Fountain Creek from 1975 through 1983 are <br />summarized in figure 15A and the measurements made from 1980 through 1983 <br />are summarized in figure 158, Although the two figures are similar, down- <br />stream variations in BODs are better represented in figure 158 because the <br />period of record and the number of measurements are more similar between the <br />sites. <br /> <br />The median BODs (1980-83) of Upper Fountain Creek (sites F12 and F15, <br />fig, 158) was about 1 mg/L, These data indicate that small quantities of <br />biochemically oxidizable material were present in this stream reach, The <br />median BODs increased from about 1 mg/L in Upper Fountain Creek to almost <br />4 mg/L at site F17 primarily as the result of inflow from Monument Creek. <br />About 0,5 mi downstream from site F17, the outfall from the Colorado Springs <br />Wastewater Treatment Plant enters Fountain Creek, Downstream from this <br />outfall, the streamflow in Fountain Creek consists largely of sewage effluent <br />(Edelmann and Cain, 1985), and BODs increases rapidly as a result of effluent <br />from the Colorado Springs Wastewater Treatment Plant and from four smaller <br />wastewater-treatment plants that enter Fountain Creek within a 10-mi stream <br />reach, as evidenced by the concentrations of BODs measured at sites F19, F20, <br />and F28, The median BODs measured at site F28, which is located downstream <br />from Security, Colo., was 28 mg/L, indicating that a considerable quantity of <br />biochemically oxygen-demanding material is present. Downstream from site F28, <br />the BODs decreases, <br /> <br />27 <br />