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<br />0129 <br /> <br />CONTENTS <br /> <br />Page <br />Abstract----------------------------------------------------------------- 1 <br />Introduction------------------------------------------------------------- 2 <br />Purpose and scope--------------------------------------------------- 2 <br />Approach------------------------------------------------------------ 4 <br />Description of study area------------------------------------------------ 5 <br />Summary statistics------------------------------------------------------- 6 <br />Water-quality variations and trend analysis------------------------------ 7 <br />Wster-quality variations-------------------------------------------- 8 <br />Water-quality trends------------------------------------------------ 11 <br />Time-series trends-------------------------------------------------- 13 <br />Summary------------------------------------------------------------------ 16 <br />References cited--------------------------------------------------------- 19 <br />Hydrologic data---------------------------------------------------------- 21 <br /> <br />Figure 1. <br /> <br />2. <br />3-8. <br /> <br />9-28. <br /> <br />FIGURES <br /> <br />8. <br /> <br />Map showing location of study ares and water-quality <br />stations-------------------------------------------------- <br />Example diagram of a box plot------------------------------- <br />Box plots showing variations in: <br />3. Instsntaneous streamflow------------------------------- <br />4. Specific conductance----------------------------------- <br />5. pH----------------------------------------------------- <br />6. Water temperature-------------------------------------- <br />1. Concentrations of dissolved oxygen--------------------- <br />8. Hardness as calcium carbonate-------------------------- <br />Box plots showing variations in concentrations of: <br />9. Dissolved calcium-------------------------------------- <br />10. Dissolved magnesium------------------------------------ <br />11. Dissolved chloride------------------------------------- <br />12. Dissolved sulfate-------------------------------------- <br />13. Suspended solids--------------------------------------- <br />14. Nitrite plus nitrate as nitrogen----------------------- <br />15. Total ammonia as nitrogen------------------------------ <br />16. Un-ionized ammonia as nitrogen------------------------- <br />11. Total ammonia plus organic nitrogen-------------------- <br />18. Total organic nitrogen as nitrogen--------------------- <br />19. Total phosphorus--------------------------------------- <br />20. Total recoverable copper------------------------------- <br />21. Dissolved iron----------------------------------------- <br />22. Total recoverable iron--------------------------------- <br />23. Total recoverable lead--------------------------------- <br />24. Dissolved manganese------------------------------------ <br />25. Total recoverable manganese---------------------------- <br />26. Total recoverable nickel------------------------------- <br />21. Total selenium----------------------------------------- <br />28. Total recoverable zinc--------------------------------- <br />Box plot showing variations in 5-day biochemical oxygen <br />demand---------------------------------------------------- <br /> <br />iii <br /> <br />Page <br /> <br />3 <br />9 <br /> <br />31 <br />31 <br />32 <br />32 <br />33 <br />33 <br /> <br />34 <br />34 <br />35 <br />35 <br />36 <br />36 <br />37 <br />37 <br />38 <br />38 <br />39 <br />39 <br />40 <br />40 <br />41 <br />41 <br />42 <br />42 <br />43 <br />43 <br /> <br />44 <br />