Every site is different in its own way because of the nature of the contaminant and the nature of the site itself. They'll all be site-dependent. However, in terms of typical remediation work, there's a lot of....
Regarding maritime environments, I was in CFB Esquimalt in Esquimalt harbour last week. I saw the results of a lot of the work they've been doing. There, it's a dredging operation. All of the material on the bottom of the harbour is dredged up, screened and cleaned. Then, if necessary, the cleaned-up material is pushed back into the harbour. Over time, we've been able to make some very significant progress in Esquimalt harbour by using that method.
On land, there will also be the screening of material. Soil is either disposed of off-site or cleaned and returned to the site, depending, again, on the contaminant and the nature of the precise site.