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• to the fact that ground water (which is typically high in salt <br />content in the analysis area), and not surface water, is the <br />main source of stream flow during this part of the year. <br />Generallq calcium is the dominant cation in the area's streams, <br />although sodium and magnesium become more significant during <br />periods of low flow. <br />Table E11-5 <br />Mean Water Quality Values for Trout Creek (near Mouth at Milner) <br />firom 5-65 to 5-66 <br />Parameter Reported Value Unit <br />Specific conductivity 330 umhos @ 25°C <br />pH 7.5 <br />Bicarbonate (HC03) 143 mg/1 <br />• <br />Residue on evap'n (105°C) 193 mg/1 <br />Total hardness (as CaCO3) 145 mg/1 <br />Calcium 35 mg/1 <br />Magnesium 14 mg/1 <br />Sodium 8.6 mg/1 <br />Potassium 1.8 mg/1 <br />Chloride 1.7 mg/1 <br />Sulfate 43 mg/1 <br />Abbreviations used: mg/1 = milligrams per liter <br />umhos = micromhos <br />Source: Colorado Water Pollution Control Commission, 1974. <br />The pH of streams in the Trout Creek watershed is basic, <br />ranging from 7.4 to 8.4, which indicates a high concentration <br />of bicarbonate ions. Other anions which may be expected to <br />be of significance in the local watershed are sulfate, and to <br /> <br /> <br />