With regard to contaminated sites, Transport Canada is currently managing 238 sites. We have closed 566. I'm quite pleased to see the progress that has been made in tackling the contaminated sites, and some of these sites that we have are legacy sites.
Also, under the contaminated sites program,—and I have colleagues here who can probably be a little more eloquent than I can be—we would go through various iterations of studies because we would want to understand the history of the site. We would undertake a site visit. We would produce an environmental site assessment, which would be sort of a first report. We then would build on that to get evidence and to do sampling to better understand the nature of the contamination. If we found that it's there and that it's of concern, then we would drill deeper and do a third site assessment and do much more detailed sampling. We would do ground samples. We would want to understand the nature and the extent of the contamination, and the volume. That would ultimately be translated into a risk assessment. There are 10 steps that we follow.