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Draft Technical Support Document: Recommended Estimates for Missing Water Quality Parameters for Biotic Ligand Model

This draft technical support document provides recommendations for default values for water quality parameters that can be used in the Freshwater Copper BLM when data are lacking. The document also describes data analysis approaches used to develop these recommendations. Following closure of the public comment period on April 18, 2016, EPA will consider the comments, revise the document, as appropriate, and then publish a final technical support document that will serve as a source of information for states, tribes, territories, and other stakeholders.

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