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Case studies illustrate the bioassessment process and biocriteria derivation procedures.
Three sampling tiers are developed, increasing in sampling effort, precision, and diagnostic ability. Alternative data analysis methods are introduced for biological index development, and the document ends with eight case studies illustrating the implementation of the methods. Many natural resource agencies throughout the United States are using bioassessments and biocriteria for small rivers and streams and some States are beginning work in lakes and reservoirs. This guidance is not a regulation and does not impose legally-binding requirements on EPA, States, Territories, Tribes, or the public. 1200 Pennsylvania Ave.