[muthas]

A couple items to note here:

- while agreed that a trap should help contain gasses, in order to cure the resin involved they have to inject high-pressure steam into the piping... possible that it could cause bubbles to pass through functional traps

- even if the trap system worked perfectly, the fumes from the cure process get vented to the local atmosphere through outlets set up during the CIPP process. This exposes workers to the largest amount of byproduct chemical vapors, but it's entirely reasonable to think that it could get accumulated or trapped in buildings as well.

The CDC has a good article about this very topic: https://blogs.cdc.gov/niosh-science-blog/2017/09/26/cipp/

[throw3737273728]

I caught a whiff of this venting to the local atmosphere in downtown SF a few years ago, and it was shocking. The smell is so strong and noxious you can’t believe that there isn’t some serious problem happening in your midst. No warning either. It’s about as frightened of a smell as I’ve ever been.