SF Chronicle: For four years, Pacific Gas and Electric Co. has been quietly buying multimillion-dollar homes in the Marina and scooping out their backyards. The utility, California’s largest, is trying to remove chemical contamination that has lurked beneath a corner of the neighborhood for more than a century, toxic waste from two long-gone fuel manufacturing plants.
People are routinely exposed to these chemicals in daily life, but they can be dangerous if the level of exposure is particularly high. A common scientific understanding is “the dose makes the poison,” whether that’s through skin contact or airborne contact, said Asa Bradman, an environmental health scientist and expert in exposure assessment at UC Berkeley School of Public Health.
Read the full article at the San Francisco Chronicle.