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This protocol provides a procedure whereby site-specific water quality standards (SSSw) to protect freshwater aquatic life can be developed for cadmium and zinc. For cadmium and zinc, a table of pre-calculated, pre-approved aquatic life protective sitespecific water quality standards for water hardness up to 500 mg/L as CaCO3 is also presented. Schedule 6 of the Contaminated Sites Regulation provides hardness dependent water quality standards for a number of substances. For cadmium and zinc, freshwater aquatic life protective standards are truncated for water hardness values of 210 and 400 mg/L CaCO3 respectively. However, Canadian Council of Ministers of the Environment (CCME) and ministrywater quality guidelines upon which the cadmium and zinc standards are based also provide formulas by which guidelines, and by inference, SSSw can be calculated should water hardness exceed 210 or 400 mg/L CaCO3. The general intent of these site-specific standards is to allow limited modification of the scheduled numerica
BC Ministry of Water Land and Air Protection. 2001. Protocol 10 for contaminated sites: hardness dependent Site-Specific Freshwater Water Quality Standards for Cadmium and Zinc. BC Ministry of Water Land and Air Protection
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