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. 00291~ . 9. Although there are no numerical criteria shown for lithium, this metal was measured at all of the stations, generally occurring at concentrations of less than 25 ~g/l. Excursions above this concentration occurred at Yellow Creek (220 ~g/l), Little Beaver Creek (40 ~g/l), and Milk Creek (60 ~g/l). . In order to determine the effect of high suspended solids on metal concentrations, fil tered and unfiltered samples were collected from the White River at Rangely (RM 78.2) on 5/26/76. This sample was extremely muddy (turbidity of 150 FTU and TSS of 600 mg/l) because of high Spring runoff flows. The dissolved and total analyses shown in Table 6 reveal the extent to which the metallic ions adhered to the suspended solids in the water. For example, aluminum, iron, magnesium, manganese, potassium, and zinc were all much more concentrated in the total form than in the dissolved form. The significant difference in the potassium concentrations may be due to a large amount of suspended illite clay which contains appreciable amounts of potassium and is a chief constituent of many shales (Jumikis, 1962; Leonards, 1962). After filtration through a 0.45~ membrane filter, metal concentrations were reduced by as much as 100 times, in the case of aluminum. Concentrations of less common trace metals, such as arsenic, cadmium, chromium, copper, lead, lithium, molybdenum, selenium, and silver were not significantly different in either the dissolved or total form. The calcium concentrations show that the dissolved form was greater than the total form, and the only possible explanation appears to be related to sample contamination. . . . Non-Meta 1 s . Profiles of boron and fluoride concentrations are depicted in Figs. 17 and 18, which show that both of these parameters were usually present at higher concentrations during "low flow" than during "high flow". Concentrations of boron averaged well below the criteria/standard limit of 750 ~g/l ,except for Yellow Creek, which averaged 1025 ~g/l during the "high flow" study. Yellow Creek also contained the highest mean fluoride concentration (2.34 mg/l), which was slightly in excess of the criteria/standard limit of 2.0 mg/l. No other station contained mean fluoride concentrations greater than 0.6 mg/l. . Nutrients . The nutrient parameters included in this study were total kjehldal nitrogen, nitrite plus nitrate nitrogen, ammonia nitrogen, total phosphorus, and ortho phosphorus. These parameters were analyzed during the "high flow" . study but were not included (they had not been requested) in the earlier "low flow" study. The organic fraction, as measured by TKN, comprised the majority of the nitrogen at each sample location with the highest concentra- tions generally being measured in the lower reach of the White River (see Fig. 19). The highly variable T~N concentrations observed at station NF-18 are thought to be due to analytical difficulties. The profile of . 39 . .J ~:'&