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<br />nn328 <br /> <br />CONTENTS <br /> <br />Abstract----------------------------------------------------------------- <br />lntroduction------------------------------------------------------------- <br />Purpose and scope--------------------------------------------------- <br />Acknowledgments----------------------------------------------------- <br />Description of study area------------------------------------------------ <br />Location------------------------------------------------------------ <br />History------------------------------------------------------------- <br />Physiography and climate-------------------------------------------- <br />Geology------------------------------------------------------------- <br />Soils and land use-------------------------------------------------- <br />Fish and wildlife resources----------------------------------------- <br />Hydrologic setting------------------------------------------------------- <br />Streams------------------------------------------------------------- <br />Uncompahgre Project------------------------------------------------- <br />Sweitzer Lake------------------------------------------------------- <br />Ground water-------------------------------------------------------- <br />Previous investigations-------------------------------------------------- <br />Water-quality data-------------------------------------------------- <br />Streams-----------------------------------------------_________ <br />Sweitzer Lake-------------------------------------------------- <br />Ground water--------------------------------------------------- <br />Soil and bottom-sediment data--------------------------------------- <br />Biological data----------------------------------------------------- <br />Sample collection and analysis------------------------------------------- <br />Objectives---------------------------------------------------------- <br />Sampling sites and schedule of sample collection-------------------- <br />Sampling methods---------------------------------------------------- <br />Analytical support-------------------------------------------------- <br />Discussion of results---------------------------------------------------- <br />Water-Quality Results----------------------------------------------- <br />Gunnison River------------------------------------------------- <br />Uncompahgre River---------------------------------------------- <br />Sweitzer Lake-------------------------------------------------- <br />Bottom-sediment results--------------------------------------------- <br />Biota results------------------------------------------------------- <br />Wildlife observations------------------------------------------ <br />Data interpretation----------------------------------------____ <br />Inorganic trace elements--------------------------------------- <br />Selenium in biota, Sweitzer Lake-------------------------- <br />Selenium in biota, Gunnison and Uncompahgre Rivers and <br />tributaries--------------------------------------------- <br />Cadmium--------------------------------------------------- <br />Copper---------------------------------------------------- <br />Hercury--------------------------------------------------- <br />Zinc------------------------------------------------------ <br />Pesticides and polychlorinated biphenyl (PCB) residues--------- <br />Correlation of constituents among water. bottom sediment, and biota------ <br />Summary and conclusions-------------------------------------------------- <br />Selected references-----------------------------------------------------~ <br />Supplemental data-------------------------------------------------------- <br /> <br />iii <br /> <br />Page <br />1 <br />3 <br />4 <br />6 <br />6 <br />6 <br />6 <br />8 <br />9 <br />9 <br />10 <br />11 <br />11 <br />16 <br />17 <br />18 <br />20 <br />20 <br />20 <br />24 <br />24 <br />25 <br />26 <br />29 <br />29 <br />31 <br />34 <br />35 <br />36 <br />36 <br />38 <br />41 <br />42 <br />46 <br />49 <br />49 <br />50 <br />51 <br />51 <br /> <br />58 <br />60 <br />60 <br />61 <br />63 <br />64 <br />66 <br />66 <br />71 <br />77 <br />