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00 <br />�J <br />9.L <br />8. 5 <br />8. 0 <br />2 <br />CL 7.5 <br />7.0 <br />6.5 <br />SITE <br />N_ to r O 00 (O <br />LL LL LL <br />LL LL N M <br />LL LL <br />Ln <br />LL <br />eD <br />LL <br />EXPLANATION <br />MAXIMUM <br />75th PERCE <br />MEDIAN <br />25th PERCENTILE <br />MINIMUM <br />88 NUMBER OF <br />MEASUREMENTS <br />12 31 <br />87 19 <br />39 <br />58 <br />88 83� 74 <br />4i 49 Z au ss se 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 14.-- Statistical summary of downstream variations in pH for <br />Fountain Creek, available data, 1975 -83. <br />Five -Day Biochemical Oxygen Demand <br />The BOD 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 15B. Although the two figures are similar, down- <br />stream variations in BOD are better represented in figure 15B because the <br />period of record and the number of measurements are more similar between the <br />sites. <br />The median BOD (1980 -83) of Upper Fountain Creek (sites F12 and F15, <br />fig. 15B) 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 BOD 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 BOD measured at sites F19, F20, <br />and F28. The median BOD5 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 BOD decreases. <br />27 <br />