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A Ten Year Summary of Concurrent Ambient Water Column and Sediment Toxicity Tests in the Chesapeake

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The goal of this study was to identify the relative toxicity of ambient areas in the Chesapeake Bay Watershed by using a suite of concurrent water column and sediment toxicity tests at seventy-five ambient stations in 20 Chesapeake Bay rivers from 1990 through 1999. Spatial and temporal variability was examined at selected locations throughout the 10 yr. study. Inorganic and organic contaminants were evaluated in ambient water and sediment concurrently with water column and sediment tests to assess possible causes of toxicity although absolute causality can not be established. Multivariate statistical analysis was used to develop a multiple endpoint toxicity index (TOX-INDEX) at each station for both water column and sediment toxicity data.

Documentation for Scenario Builder

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Creation of the Nutrient and Scenario Builder tool was achieved with the excellent assistance of the Chesapeake Bay Program Information Technology contractor’s team led by Jessica Rigelman. With her leadership, Jonathan Lewis, Robert Weiss, Mark Lane, and Aaron Knister built a complex functional software product under a very tight deadline. Their questions along the way helped to strengthen the methodology. Without Jessica Rigelman’s encouragement of all of us, this project would not have been accomplished.

View document [PDF, 3.1 MB] Documentation for Scenario Builder