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beak <br />Water chemistry sampling was conducted at four stations (C-F) in the <br />• North Fork Gunnison River and two stations (A, B) in Anthracite Creek <br />(Figure 1) on November 10, 1980. Water samples were collected concurrent <br />with biological and in situ chemical sampling (see Appendix XVIII.B for <br />results of these studies). Results of field measurements and laboratory <br />analyses are contained in Table 1, <br />Stations C, D, E, and F had higher levels of dissolved solids <br />(97 - 104 mg/liter) than stations A and B (74 - 83 mg/t). The higher <br />levels of dissolved materials were also reflected in higher specific con- <br />ductance at station C (123 umhos/cm2) and stations D, E, and F (143 - 148 <br />umhos/cm2) than at stations A and B (103 - 117 umhos/cm2). Total hardness <br />was also correspondingly higher at stations C, D, E, and F (69 - 71 mg/R) <br />than at station A (50 mg/A) or station B (15 mg/P). <br />• Bicarbonates were the predominant anion at the observed level of pH. <br />The concentration of bicarbonates ranged from 70 mg/¢ at stations A and B <br />to 90 - 100 mg/e at stations C, D, E, and F. The other measured anions <br />showed no consistent patterns among stations. Among the measured cations, <br />magnesium, iron, potassium, sodium and manganese showed station differences <br />consistent with the pattern of higher concentrations at stations C, D, E, <br />and F. Total volatile solids was higher at stations D, E, and F than at <br />stations A, B, and C. <br />In most natural waters the dissolved solids will consist primarily of <br />carbonates, bicarbonates, chlorides, sulfates, phosphates or nitrates of <br />calcium, magnesium, sodium, potassium, iron and manganese (McKee and Wolf <br />1963). The data available indicate a somewhat elevated concentration of <br />• <br />