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Clarification of the use of Biological Data and Information in the 2002 Integrated Water Quality Monitoring and Assessment Report Guidance
MEMORANDUM
| DATE: | March 26, 2002 |
| SUBJECT: | Clarification of the use of Biological Data and Information in the 2002 Integrated Water Quality Monitoring and Assessment Report Guidance |
| FROM: | Robert H. Wayland III, Director /s/ Office of Wetlands, Oceans and Watersheds |
| TO: | EPA Regional Water Management Directors EPA Regional Science and Technology Directors State, Territory and Authorized Tribe Water Quality Program Directors |
This memorandum modifies the 2002 Integrated Water Quality Monitoring and Assessment Report Guidance to provide clarity and promote consistency in the manner in which states use biological data and information in developing their 2002 submissions. Specifically, EPA has removed the following paragraph from the Guidance...
EPA believed that this paragraph could have been interpreted to be inconsistent with the intent of the Clean Water Act (CWA) because it could have led to the placement of a formally defined impaired water into Category 3. When existing and readily available data and information (biological, chemical or physical) are sufficient to determine that a pollutant has caused, is suspected of causing, or is projected to cause the impairment, the AU should be listed in Category 5. (When biological data and information indicates that the impairment is not caused by a pollutant, the AU may be placed in Category 4C.) Only when the state determines that the existing data and information (biological, chemical or physical) are insufficient to support an attainment determination, can an AU be listed in Category 3.