"Water will leach inside homes, she said, through basement cracks. Toilets may become chronically backed up. Raw sewage may seep through manholes. Brackish water will corrode sewer and water pipes and inundate building foundations. And most hazardous of all, water percolating upward may flow through contaminants buried in the soil, spreading them underground and eventually releasing them into people’s homes. The coup de grace will be the earthquakes, which, when they strike, may liquefy the entire toxic mess, pushing it toward the surface."
-- Kristina Hill, professor of urban and environmental design at UC Berkeley