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Final Policy on Biological Assessments and Criteria

By Brandes, Rick

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Book Id: WPLBN0000065442
Format Type: PDF eBook
File Size: 1.1 MB
Reproduction Date: 2007

Title: Final Policy on Biological Assessments and Criteria  
Author: Brandes, Rick
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
Publication Date:
Publisher: United States Environmental Protection Agency


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Brandes, R. (n.d.). Final Policy on Biological Assessments and Criteria. Retrieved from

Excerpt: TO: Regional Permits Branch Chiefs (I-X) I have enclosed for your information and use a copy of the recently issued Policy on Biological Assessments and Criteria. This policy was signed by Tudor Davies on June 19, 1991. The content of the policy is also stated in the Technical Support Document for Water Qualitv-based Toxics Control. One aspect of the policy expresses that water quality standards are to be independently applied. This means that any single assessment method (chemical criteria, toxicity testing, or biocriteria) can provide conclusive evidence that water quality standards are not attained. Apparent conflicts between the three methods should be rare. They can occur because each assessment method is sensitive to different types and ranges of impacts. Therefore, a demonstration of water quality standards nonattainment using one assessment method does not necessarily require confirmation with a second method; nor can the failure of a second method to confirm impact, by itself, negate the results of the initial assessment

Table of Contents
Contents Statement of Policy Definitions Background Context of Policy Rationale for Conducting Biological Assessments Conduct of Biological Surveys Integration of Methods and Regulatory Application Site-specific Considerations lndependent Application Biological Criteria Statutory Basis Section 303(c) Section 304(a) State/EPA Roles in Policy lmplementation State Implementation EPA Guidance and Technical Support


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