I applied through university. The process took 1 day. I interviewed at Whiting-Turner (Irvine, CA) in Feb 2016
Interview
Whiting -Turner came to my school and I met with them there initially at a career fair. They had a meet and greet a couple weeks after. Finally I interviewed the day after and got the job.
It was pretty simple, all they were asking was about previous experience questions and asking why interested in the company and industry, definitely judge you on your personality and public speaking.
Pretty straightforward. They mostly ask personal questions rather than behavioral. Make sure you know why you want work there and have a solid answer to “tell me a bit about yourself “
Panel of different interviews with different project managers or vp's. They then ask what you're looking for out of the internship, your experience, and basically make sure you are a good candidate.