This company has built over half of the thousands of tanks in New York City. Its a good video ruffly showing how they are built. The basic form of construction hasn't changed in over 80 years, they are still using some of the original equipment to mill the lumber.
Also if you can find it, this same company was on an episode of Dirty Jobs with Mike Rowe. It is a little more informative than this news report, and Mike Rowe is more entertaining. I believe it was Season 4 episode 8 "Dirty Jobs of the Big Apple".