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<br /> <br />OD1383 <br /> <br />CONTENTS <br /> <br />Metric conversion table. <br />Abstract . . <br />Introduction. . . <br />Approach . . . . . <br />Historic data <br />Basinwide reconnaissance--1975. <br />Quarterly sampl ing program--1975 to 1976. <br />Related studies. . <br />Results and discussion. . . . . . . . . <br />Stream temperature. . . . . . . . . <br />Major inorganic constituents and specific conductance <br />Stream qual ity during low flow. <br />Trace elements and pH. <br />Nutrients. . . . <br />Dissolved oxygen. <br />Biology. . . . <br />Ambient stream qual ity <br />Seasonal variations in stream qual ity <br />Frequency distributions. . . . . <br />Outl ier analysis. . . . . . . . <br />Changes in ambient stream qual ity. <br />Toxic organic and radiochemical constituents <br />Effects of coal mining on stream qual ity. <br />Summa ry. . . . . . . . . <br />References cited. . . . . <br />Supplemental information. <br />Stream qual ity during low flow. <br />Precision of chemical-constituent concentrations <br />Trace elements in water. . . . . . . . . . <br />Trace elements in stream-bottom sediments. <br />Nutrients. . . . . . . . . . . . <br />Seasonal variations in stream quality. . . . . <br />Trace elements in water. . . . . . . . . . <br />Trace elements in stream-bottom sediments. <br />Nutr ients. . . . . . . . . . . . . . . . . <br />Calculation of evaporative-cooling concentration factor <br /> <br />. <br /> <br /> Page <br /> V III <br />. 1 <br /> 1 <br /> 3 <br /> 4 <br /> 5 <br /> 5 <br /> 5 <br /> 10 <br /> 10 <br /> 26 <br /> 40 <br /> 40 <br /> 67 <br /> 68 <br /> 68 <br /> 75 <br /> 75 <br /> 78 <br /> 95 <br /> 99 <br /> 99 <br /> 102 <br /> 104 <br /> 106 <br /> 111 <br /> 1.11 <br /> 1.11 <br /> 113 <br /> 119 <br />. 123 <br /> 127 <br /> 127 <br /> 145 <br />. 153 <br /> 161 <br /> <br />III <br /> <br />! <br />, t; ._~ <br />