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<br />1766 <br /> <br />. <br /> <br />24. Median seasonal dissolved and tolal-recoverable selenium concentrations in the lower <br /> <br />Arkansas River, April 1990-Man:h 1993 .........................................................................:...._.............................. <br /> <br />25. Median seasonal dissolved and tolal-recoverable zinc concentrations in the lower Arkansas River, <br /> <br />April 1990-M=h 1993 ...................................................................................................__............................... <br /> <br />26. Variability of ammonia and nitrite plus nitrate concentrations in the A.rkanas River, April 1990-March 1993... <br /> <br />27. Seasonal variations of ammonia and nitrite plus nitrate concentrations in the Arkansas River, <br /> <br />April 1990-March 1993 .........................................~.............................. ................................................................. <br /> <br />28. Variations in phosphorus concenrmtion in the Arkansas River, April 1990-March 1993..................................... <br /> <br />29. Comparison of uranium concenrmtions in the Arkansas River, April 1990-Man:h 1993.................................... <br /> <br />30. Variations in concentration and seasonal comparisons oftolal suspended sediment <br /> <br />at selected sites in the Arkansas River. April 1990-March 1993 ........................................._............................... <br /> <br />31. Median fecal coliform, fecal streptococc~ and total coliform bacteria ,concentrations and seasonal fecal <br /> <br />coliform concentrations at selected sites in the Arkansas River, April 1990-March 1993....._.............................. <br /> <br />~ABLES <br /> <br />1. Selected watet-quality sites and analytical groups sampled in the Arkansas River Basin, <br /> <br />April 1990-March I 993 .................................................................................................__...:.......................... <br /> <br />2. Regression equations for total dissolved solids and specific conductance for selected sites <br /> <br />in the Arkansas River Basin. April 1990-March 1993................................................................~..................... <br /> <br />3. Regression equations for hardness and specific conductance for selected sites in the <br /> <br />Arkansas Rivet Basin, April 1990-March 1993................................................................................................ <br /> <br />4. Results ofWLlcoxon rank-sum lest (I-tailed) ofpre-trealment (April 1990-Marcb 1992) and post-treatment (April <br /> <br />1992-March 1993) instantaneous streamflow and cadmium concentrations in the Arkansas River ................ <br /> <br />5. Number of samples that exceeded the acure and chronic cadmium water-quality standards in the <br /> <br />upper Arkansas River, April 1990-March 1993..........................................................__........................_... <br /> <br />.. <br /> <br />. <br /> <br />VI CONTEHTS <br />