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6. Hydrological Units and Selenium Criteria
part, which is to gain a working knowledge of selenium transport and
bioaccumulation and apply that knowledge to delineate Hydrological
Units (HUs). Using HUs is critical to developing criteria that provide
watershed-level protection of aquatic life. The second part in the process is interpreting basinwide information on selenium residues and
biological effects and following a step-by-step procedure for setting
local criteria. That part is presented in the next chapter.
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