It was my grandfather and his partner’s marine contracting firm based out of Richmond that undertook the task of clean-up. They lost a tugboat due to unexploded bombs. (Which subsequently did explode). As to my understanding, they took all the unexploded bombs, scooped out a hole not to far away and dumped all the debris and crap in it, put a pile of dirt on top and called it Bomb Island or something of the sort. It was a good contract. In the SF Bay there were only two Marine contractors, Crowley (which I think still exists today) and Lebeouf & Dougherty. His was a much smaller firm and probably got the contract because Crowley got everything else. Didn’t want the appearance of a monopoly for Crowley.
I do have some pictures somewhere that his company took at the time. I should go look them up.