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0166 <br />CONTENTS <br />iii <br />Page <br />Abstract----------------------------------------------------------- - - - - -- <br />1 <br />Introduction------------------------------------------------------- - - - - -- <br />3 <br />Purpose and scope--------------------------------------------- - - - - -- <br />5 <br />Acknowledgments----------------------------------------------- - - - - -- <br />5 <br />Description of the study area------------- --- -- ---------- `--- ------ - - - - -- <br />5 <br />Location------------------------------------------------------ - - - - -- <br />5 <br />History ---------------- - - - - -- <br />8 <br />Climate------------------------------------------------------- - - - - -- <br />9 <br />Geology------------------------------------------------------- - - - - -- <br />9 <br />Soils--------------------------------------------------------- - - - - -- <br />11 <br />Landuse------------------------------------------------------ - - - - -- <br />- - - - -- <br />11 <br />13 <br />Fish and wildlife--------------------------------------------- <br />Hydrologic settin --------- ----- -------------- - - - - -- <br />13 <br />Watersupply ------------------------------------ - - - - -- <br />13 <br />Runoff-------------------------------------------------------------- <br />14 <br />Return flows-------------------------------------------------- - - - - -- <br />17 <br />Ground water-------------------------------------------------- - - - - -- <br />17 <br />Previous studies------------------------- -------- - - - - -- <br />18 <br />Sample collection and analysis------------- -- --- ------------------- - - - - -- <br />20 <br />Objectives---------------------------------------------------- - - - - -- <br />20 <br />Sampling sites------------------------------------------------ - - - - -- <br />22 <br />Sampling methods---------------------------------------------- - - - - -- <br />26 <br />Analytical support-------------------------------------------- - - - - -- <br />27 <br />Discussion of results---------------------------------------------- - - - - -- <br />28 <br />Determination of elevated concentrations----- --- ------ ----------- - -- <br />28 <br />Water quality------------------------------------------------- - - - - -- <br />30 <br />Bottom sediment----------------------------------------------- - - - - -- <br />39 <br />Biota--------------------------------------------------------- - - - - -- <br />- - - - -- <br />40 <br />40 <br />Aluminum------------------------------------------------- <br />Arsenic-------------------------------------------------- - - - - -- <br />41 <br />Cadmium-------------------------------------------------- - - - - -- <br />42 <br />Copper--------------------------------------------------- - - - - -- <br />- - - - -- <br />42 <br />43 <br />Mercury ----------------------- <br />- - - - -- <br />43 <br />Selenium------------------------------------------------- <br />- - - - -- <br />46 <br />Zinc----------------------------------------------------- <br />-- --- - - - - -- <br />47 <br />Organochlorine pesticides-------- ---- ----- ---------- <br />Correlation among substrates---------- --- - ------------------- - - - - -- <br />47 <br />Summary------------------------------------------------- - - - - -- <br />49 <br />52 <br />References--------------------------------------------------------------- <br />- - - - -- <br />56 <br />Supplemental data-------------------------------------------------- <br />iii <br />