Yes. There are thousands of different PFAS, but some of them are more theoretical. You can imagine chemical Legos of how you can structure those PFAS. We do measure 80 different PFAS and we can look for 200 more, but we usually find between 15 and 35. We never find.... Some of those are fairly rare and the concentrations are low.
Usually, on a contaminated site we'll find 30 to 35, and then you get a sort of fingerprint, in terms of the different concentrations that we observe in that fingerprint. Then you can see some are very high, some are low. I've compared it to a fruit salad. Then, if you get a fruit salad that has oranges, apples and blueberries, and you don't see blueberries very often, this is a strange fruit salad. Then, at some point, one fruit salad has a lot of cranberries, and you rarely see the cranberries, so you know something's funny. This is an easy image, but that's a bit of what we do when we're measuring 80 PFAS, and there's a peculiar signature in La Baie.