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Option 1 - Remediation

This option is more challenging if you have groundwater contamination because it's harder to be confident that you'll be able to get it all. So oftentimes groundwater contamination will lead you toward option number two below. But if all you're dealing with is contaminated soil and you feel confident in your delineation (i.e. you've determined the extents of it), then it's fairly common to just remediate it during construction. And if you're building something like underground parking anyway, it often makes sense to do exactly this. Industry people call this a "dig and dump" approach.

However, there are cost and schedule impacts associated with this approach. Removing and disposing of contaminated soil costs money — there's a premium. So a typical approach is to test the soil as you're excavating it to determine what's clean and what's contaminated. This process of stock piling and testing requires addiitional effort, but without it you'd have to assume that 100% of the soil you're excavating is contaminated and that's often a more expensive proposition. Regardless of your exact remediation approach, you will need to budget both time and money.

Option 2 - Risk Assessment

The simplest way to understand a risk assessment is that it's a way of saying, "we all acknowledge that this site is contaminated and that we're not going to clean it up, but we've accurately assessed all the environmental risks and, if necessary, we will implement appropriate risk management measures." Again, this approach can be useful if you have groundwater contamination or there's some other reason why it's not reasonable or feasible to simply remediate the site. Maybe you don't need or want to excavate and so this would be a significant incremental cost.

Now, there are different streams of Risk Assessments. Some take longer than others. But on challenging sites, it would not be unheard of for the process to take between 2-3 years, and sometimes even longer. This can cause significant delays to a project, especially in municipalities where they maybe aren't as accustomed to dealing with contaminated infill sites and they haven't gotten their head around things like conditional building permits. (Conditional building permits can allow a project to continue moving forward while a developer works to file their RSC, among other requirements.)

Barrier to new housing

Finally, I would like to highlight the barrier that the above processes represent for the delivery of new housing. This is especially true as Toronto and other cities work to encourage more infill housing. Small projects with little or no parking (i.e. no undergrounds) are challenging and expensive to remediate because there's usually no planned excavation. At the same time, these projects don't have the luxury of waiting around for 2-3 years while a Risk Assessment works its way through the Ministry. The entire project timeline might be shorter than this.

Obviously human safety is paramount. That should never change. But I feel strongly that we're going to need to find ways to streamline the environmental approvals for new housing. Otherwise we'll continue to restrict large portions of our cities from becoming new homes. The requirement to file an RSC could alone kill the feasibility of a small-scale housing project. And that's why it was one of the points in my recent post about "how to improve the feasibility of infill housing."

Once again, I will remind all of you that I am not an environmental engineer, or an environmental lawyer, or anyone besides a generalist developer. Though I have had to deal with this process on virtually every site I've ever worked on. It's complicated and every site is unique — so as a developer, it's important to do your own homework. This post is simply intended as a basic environmental primer for developers, and as a way to further highlight one of the many barriers to new infill housing.

Cover photo by Anastasia Meraki on Unsplash