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<br />concentration and conductivity is 1Wredramatic. Below Clifton at CR-17, chloride <br /> <br />concentrations aver.aged 157 ppm. At CR-19, downstream from the Gunnison confluence, <br /> <br /> <br />the chloride concentration on February 19, 1974 was 140 ppm on the north side of <br /> <br /> <br />the River and 9 ppm on the south side of the River from which the Gunnison enters. <br /> <br />Nutrient concentrations in the. upper portion of the study area were usually <br /> <br />too low to measure in December during. the time of low, cold water. From CR-17 <br /> <br />to CR-23 during the same period, nitrate concentrations of greater than 2.0 ppm <br />were measured (see Figure 3). Detectable levels of nitrite nitrogen were also <br /> <br />encountered, Tables 2 - 10. When runoff began and suspended solids increased, <br /> <br />measurable amounts of nitrate, ammonia, and orthophosphate were encountered <br /> <br />along the entire study area. Nitrite was not encountered during this period. <br /> <br />For runoff nitrate results, see Figure 4,. <br /> <br />As runoff increased, the concentrations of other constituents such as <br /> <br />suspended solids and turbidities increased while chlorides, sulfates, alkalinity, <br /> <br />and hardnesses decreased. <br /> <br />Efforts to determine 5-day BOD (biochemical oxygen demand) values for the <br /> <br /> <br />River were unconclusive. Oxygen depletions were always less than 20% thus making <br /> <br /> <br />numerical values invalid but indicating a very low oxidation rate in the River. <br /> <br /> <br />On three occasions, BODS tests were run in si tu. Samples were placed in black <br /> <br /> <br />BOD bottles and incubated in the River for five days, The results are listed <br /> <br />as follows: <br /> <br />-12- <br />