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<br />. <br /> <br />002918 <br /> <br />. <br /> <br />nitrite + nitrate concentrations in Fig. 20 shows a general increase in <br />concentrations in the downstream direction similar to the TKN profile. <br />Phosphorus levels generally tended to follow the same pattern of increasing <br />concentrations in the downstream direction, as shown in Fig. 21. Mean <br />total phosphorus concentrations in excess of the criteria/standard limit <br />of 0.1 mg/l were measured in Little Beaver Creek (0.419 mg/l), Coal Creek, <br />(0.250 mg/l), Milk Creek (0.183 mg/l) and at all White River sampling <br />stations downstream from Meeker (maximum of 0.630 mg/l at RM 78.2). <br />These mepsurements indicate the presence of nutrients in sufficient concen- <br />trations to warrent concern over excessive algal growth should the waters <br />in the lower White River basin be impounded. Of course, further study in <br />the form of algal assays and additional stream sampling would be required <br />in order to fully evaluate tflis pO'ssiblity. Irrigation return flows were <br />the likely cause of elevated levels of phosphorus in the three creeks, <br />but, as shown in Table 3, the phosphorus load from these tributaries <br />(a total of <0.01 kg/day) did not contribute significantly to the total <br />phosphorus load in the White River. , <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />44 <br /> <br />. <br /> <br />~ <br />