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Nutrient and energy-cycling check

These values are nationally endorsed through the Canadian Council of Ministers of the Environment (CCME) and are recommended for toxic substances and other parameters (e.g., nutrients, pH) of concern in the ambient environment. The development of the Canadian Soil Quality Guidelines was initiated by CCME in 1991. In response to the urgent need to begin remediation of high priority “orphan” contaminated sites, an interim set of soil quality criteria was adopted from values that were in use in various jurisdictions across Canada (CCME 1991). There is a continued need for national soil quality guidelines for the management of soil quality with a particular focus on remediation of contaminated sites. The Canadian Soil Quality Guidelines are developed according to procedures that have been described by CCME (CCME 1996a; revised in 2006). According to this protocol, both environmental and human health soil quality guidelines are developed for four land uses: agricultural, residential/parkland, commercial and industrial. The lowest value generated by the two approaches for each of the four land uses is recommended by CCME as the Canadian Soil Quality Guideline. The original Canadian Soil Quality Guidelines for zinc were released by CCME in a working document entitled Recommended Canadian Soil Quality Guidelines (CCME 1997), which was then revised and published by CCME in 1999 (CCME 1999); its derivation was documented in a supporting document developed by Environment and Climate Change Canada (formerly Environment Canada) (EC 1999a). The current revision (this document) to the Canadian Soil Quality Guidelines for zinc supersedes the 1999 and 1997 zinc soil quality guidelines and the 1991 interim remediation criteria for soil (CCME 1991). The interim remediation criteria for soil (CCME 1991) should be used only when soil quality guidelines based on the CCME protocol (CCME 1996a or 2006 update) have not yet been developed for a given chemical.