CADDIS Volume 3: Examples & Applications
An Iterative Approach for Identifying the Causes of Reduced Benthic Macroinvertebrate Diversity in the Willimantic River, Connecticut (Final)
This case study demonstrates that a screening assessment can help to focus sampling for unknown episodic sources of toxic discharges. The removal of the discharge led to the removal of this segment of the Willimantic River from the 303(d) list of impaired waters.
- Preliminary analysis leading to the collection of additional information (Iteration).
- Biological screening methods to bracket an impairment and its sources.
- Comparing and evaluating multiple potential causes.
- Confirmation of the probable cause by monitoring after manipulating exposure.
- Displaying the evidence by annotating causal pathways on conceptual models.
- Recognition of different styles for providing information, which are presented for comparison.
- Recognition of rates of change following a manipulation or management action.
|Sep 2007||An external peer review was conducted by an independent contractor.|
|Jun 2010||EPA released the final report.|
- (121 pp, 4 MB, about PDF)