Determining the effects of a pipeline spill in Canadian boreal lakes: experimental additions of**diluted bitumen (dilbit) to in-situ enclosures at the IISD-experimental lakes area

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We will assess risks associated with a diluted bitumen (dilbit) spill to water, the major environmental risk from pipelines. The purpose of this research is to generate important information on the fate, transport, and toxicity of dilbit to inform management practices and regulatory measures on future pipeline projects. The objectives of this research are: (1) quantify the behavior, fate, and weathering of dilbit constituents in a natural Canadian Boreal water column as simulated in a contained enclosure system; (2) perform an exposure assessment of dilbit constituents based on a 'water column' and 'bottom substrate' exposure design; (3) determine bioaccumulation of dilbit constituents from a water column', and 'bottom substrate' exposure design; (4) assess dilbit toxicity based on a 'dose-response' design; and (5) provide much-needed information to assist the development of management practices and regulations for the transport of diluted bitumen in Canada. This research will provide important information on the long term impacts of dilbit spills in aquatic environments and assist in planning remediation strategies for future spills. This information is critical for local decision makers, including Environment and Climate Change Canada, Fisheries and Oceans Canada, the National Energy Board, and the Ontario Ministry of the Environment, who are responsible for managing lands affected by pipeline breaches.**