 So we're very concerned about worker safety at Curitin Place Pipe Sites, primarily because they're a vulnerable population. They are working in very close contact with these rock chemicals, they are exposed to these chemical plumes, and even if you don't see the plume, if you smell an odor, that means you're being exposed to something, and it doesn't necessarily mean you're being exposed to one chemical, you could be exposed to a multitude of chemicals, and the multitude of chemicals causes that one odor.