On March 23, 2008, BLDGBLOG reported on chemical dumping offshore from the San Francisco Bay. He quotes the U.S. Geological Survey,
“Between 1946 and 1970, approximately 47,800 large barrels and other containers of radioactive waste were dumped in the ocean west of San Francisco. The containers were to be dumped at three designated sites, but they litter a sea floor area of at least 1,400 km2 known as the Farallon Island Radioactive Waste Dump.
The exact location of the containers and the potential hazard the containers pose to the environment are unknown.”