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beak <br />values were relatively higher at Muddy Creek than either Anthracite Lreek <br />• or North Fork stations. In addition to the measured values, a marked <br />increase in turbidity and attached algal periphyton was visually evident at <br />Muddy Creek relative to other stations during sampling. This difference <br />was likely related to the station's proximity to outflow from Paonia Reservoir <br />immediately upstream (Figure 2.0-1). Hynes (1970) cites several studies <br />where lakes and impoundments substantially influenced water quality and the <br />composition of aquatic organisms in outflowing streams. This was attributed <br />principally to introduction of thermally altered waters and enrichment from <br />organic material, primarily plankton. <br />Results of laboratory analysis of water samples (Table 3.0-2) showed <br />stations C, D, E, and F had higher levels of dissolved solids (97 - 104 <br />mg/liter) than stations A and B (74 - 83 mg/e). The higher levels of dis- <br />• solved materials were also reflected in higher specific conductance at <br />station C (123 umhos/cm2) and stations D, E, and F (143 - 148 umhos/cm2) <br />than at stations A and B (103 - 117 umhos/cm2). Total hardness was also <br />correspondingly higher at stations C, D, E, and F (69 - 71 mg/~.) than at <br />station A (50 mg/A) or station B (15 mg/R). <br />Bicarbonates were the predominant anion at the observed level of pH. <br />The concentration of bicarbonates ranged from 70 mg/z 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 />3-6 <br />