You may be able to get the bid documents from the Owners (e.g. - WSDOT and SoundTransit) although I'm not sure. This would give you information on the soils and what the original consultants thought.
Anything past that probably hasn't come out yet since the jobs are aren't in a position where much has been published about them. If you want more information in general you can read conference proceedings (RETC, WTC, NATC).
Much of the deeper analysis and such isn't really accessible to the layman because it's really buried in the litigation.
SR 99 is likely your best bet between the two jobs because WSDOT has had an open book policy on the job. I think they've been too much of an open book, but that's neither here nor there.
Anything past that probably hasn't come out yet since the jobs are aren't in a position where much has been published about them. If you want more information in general you can read conference proceedings (RETC, WTC, NATC).
Much of the deeper analysis and such isn't really accessible to the layman because it's really buried in the litigation.
SR 99 is likely your best bet between the two jobs because WSDOT has had an open book policy on the job. I think they've been too much of an open book, but that's neither here nor there.