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<br /> <br />002556 <br /> <br />8 <br /> <br /> <br />'" <br />W <br />I- <br />::i <br />ffi <br />0- <br /> <br />~ 6 <br />'" <br />::i <br />.. <br />:E <br />g <br />ci <br />:i 4 <br />~ <br />" <br />ili <br />'" <br />~ <br />o <br /><I 2 <br />U <br />~ <br />:J: <br />U <br />o <br />iii <br /> <br />. Observed biochemical oxygen demand (BOD) <br /> <br /> <br />Decay-rate constant (Base El = 0.091 <br /> <br />Decay-rate constant {Base 10} =0.039 <br />Ullimale 800 (mg/L) =8.0 <br />5-day 800 (mg/L) = 2.9 <br /> <br />o <br />0.0 <br /> <br />1.9 <br /> <br />3.8 <br /> <br />5.7 <br /> <br />7.6 9.5 11.4 <br />TIME. IN DAYS <br /> <br />13.3 <br /> <br />15.2 <br /> <br />17.1 <br /> <br />Figure ll.--Least-squares method of calculating decay rates and concentrations of <br />biochemical oxygen demand, Yampa River downstream from Steamboat II near <br />Steamboat Springs, site YM-S. <br /> <br />21 <br /> <br />19.0 <br />