The Guidance Document you are attempting to access, "Short Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Water to Freshwater Organisms (4th Ed. October 2002)", is reserved for Enviro.BLR.com subscribers.

Excerpt from "Short Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Water to Freshwater Organisms (4th Ed. October 2002)"
The objective of aquatic toxicity tests with effluents or pure compounds is to estimate the "safe" or "no effect" concentration of these substances, which is defined as the concentration which will permit normal propagation of fish and other aquatic life in the receiving waters.

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Internal Reference: Catcode=A201 Funcode=UD74