Preparations are underway for the 'Big Bay Boom!' It is the largest 4th of July fireworks show on the West Coast, according to organizers. The show begins at 9:00 p.m. on Thursday. Fireworks will be set off from four different barges. As many as 500,000 people are expected to watch the show. Sam Bruggema of Pyro Spectaculars, said it took four days to set up for this show. It is expected to last 17-18 minutes long. MORE: https://www.cbs8.com/article/news/local/everything-you-need-to-know-about-the-big-bay-boom/509-5807a024-0fc9-49c2-a177-156c8a5d0d95