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009'` <br />EXPLANATION <br />MAXIMUM <br />75TH PERCENTILE <br />MEDIAN <br />• MEAN <br />25TH PERCENTILE <br />MINIMUM <br />37 NUMBER OF MEASUREMENTS <br />GREATER THAN <br />DETECTION LEVEL <br />SITE <br />18 M28 M34 <br />1975 -79 <br />16 <br />p 14 <br />Z <br />Q <br />2 <br />w Cr <br />0 H 12 <br />Z <br />w <br />C7 � <br />} w <br />X 0 - 10 <br />0� <br />QQ <br />U <br />C7 8 <br />W J <br />_J <br />U <br />O Z 6 <br />m — <br />} <br />Q <br />in 4 <br />0 <br />2 <br />SITE <br />M28 M35 <br />1980 -83 <br />37 <br />37 <br />Figure 25. -- Statistical summary of 5 -day biochemical oxygen demand for sites <br />M28 and M34, 1975 -79, and for sites M28 and M35, 1980 -83. <br />Monthly variations in dissolved- oxygen concentrations measured at site <br />M28 are summarized in figure 27. The smallest median dissolved- oxygen concen- <br />trations occur during July and August when water temperatures are warmest, <br />which results in lessened oxygen solubility; largest dissolved- oxygen concen- <br />trations occur during December, January, and February when water temperatures <br />are coldest, which results in greater oxygen solubility. <br />41 <br />