Fireworks exploded over the Bay Bridge and thousands of people crowding the waterfront near the new ballpark gasped in admiration. Some of the best seats for the spectacle are along the north side of Pier 50, home of Westar Marine Services where owner's and employees share a barbecue in honor of the annual display sponsored by a local radio station. But the folks at Westar are more than passive observers, the tugs that are managing the fireworks barges are contracted from Westar. This annual fireworks event sums up Westar Marine Services' role on San Francisco Bay. They are the company that takes on all of the niche jobs that others with their large investments in big horsepower and Z-drives can't afford to be doing.