How is the updated freshwater criterion recommendation different from the previous recommended criterion?
The 1986 and 1995-updated copper criteria are based on an empirical relationship of toxicity to water hardness, 2 and do not explicitly consider the effects of other water quality parameters on copper toxicity. EPA’s earlier recommendations provided for sitespecific adjustments using the 1994 and 2001 WER 3 procedures to account for variations in water chemistry other than hardness. (The 1994 (PDF) and 2001 WER guidance (PDF) documents can be found online).
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