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Causal Assessment of Biological Impairment In the Bogue Homo River, Mississippi Using the U.S. EPA's Stressor Identification Methodology (Final)
Citation:
U.S. EPA. Causal Assessment of Biological Impairment In the Bogue Homo River, Mississippi Using the U.S. EPA's Stressor Identification Methodology (Final). U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-08/143, 2010.
Impact/Purpose:
The Bogue Homo was initially listed as impaired based upon an evaluation of geographic information with no field measurements. Follow up biological monitoring of benthic macroinvertebrates by the Mississippi Department of Environmental Quality (MDEQ), confirmed that the stream was impaired. Candidate causes included decreased dissolved oxygen (DO) and altered food resources (organic matter), unsuitable habitat, increased temperature, increased ionic strength, and/or increased toxicity.
Description:
EPA announced the availability of the final report, Causal Assessment of Biological Impairment in the Bogue Homo River, Mississippi Using the U.S. EPA’s Stressor Identification Methodology. This assessment is taken from more than 700 court ordered assessments of the causes of impairments requiring development of a total maximum daily load (TMDL). Therefore, it is a good example of several strategic techniques for expediting causal analyses and TMDLs. A TMDL is the calculation of the maximum amount of a pollutant that a body of water can receive and still meet water quality standards, and an allocation of that amount to the pollutant's sources. The calculation of a TMDL is required for all waters that are listed as impaired, in accordance with §303(d) of the Clean Water Act.
URLs/Downloads:
Causal Assessment of Biological Impairment in the Bogue Homo River, Mississippi Using the U.S. EPA's Stressor Identification Methodology (Final) (PDF, 81 pp, 4067 KB, about PDF)The Causal Analysis/Diagnosis Decision Information System (Caddis)