2. Background

A notice summarizing the scientific considerations of the final screening assessment report for 2,4,6-TTBP (PDF 1 MB) was published by the Government of Canada in the Canada Gazette, Part I, on January 31st, 2009. The approach taken in this screening assessment report was to examine available scientific information and develop conclusions based on a weight-of-evidence approach and using a precautionary approach, as required under section 76.1 of the Canadian Environmental Protection Act, 1999 (CEPA 1999).

The final screening assessment report concluded that 2,4,6-TTBP is entering or may be entering the environment in a quantity or concentration or under conditions that have or may have an immediate or long-term harmful effect on the environment or its biological diversity. Therefore, it was concluded that 2,4,6-TTBP meets the toxicity criteria in paragraph 64(a) of CEPA, 1999. Additionally, 2,4,6-TTBP meets the criteria for persistence and bioaccumulation potential as set out in the Persistence and Bioaccumulation Regulations. A Proposed Order to add 2,4,6-TTBP to Schedule 1 of CEPA 1999 was published on May 16th, 2009.