They should not be exempt from environmental assessment merely because they're infrastructure projects.
What sort of infrastructure project are we talking about? If we're talking about siting a sewage treatment plant on a wetland, that should be assessed because it may have significant environmental effects. Also, just because a project is intended to benefit the environment in some way, that is not a reason for excluding it from assessment either, because it may have a number of significant adverse effects.
However, a lot of the infrastructure projects are small things, such as building a community arena or something like that. Perhaps those should not be subject to assessment.
At the federal level, I think we do need to focus on the big stuff and not sweat the small stuff so much, which unfortunately hasn't been a feature of CEAA so far. Not that there hasn't been a lot of good work done in the screening assessments--there has been, but we've learned some things. A lot of standards have been developed because of the work that has been done, such as, for example, no pipeline crossings over streams.
There's a standard set of rules for companies building pipelines across streams and rivers. Those are followed. We don't need to go into a big song and dance about that, because basically the engineers know what the standards are,and they follow them.