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In 2010 a 30" diameter, high-pressure natural gas pipeline ruptured and exploded in San Bruno, a small town located on the San Francisco peninsula between Silicon Valley and San Francisco. The incident killed eight residents. It destroyed 38 single family residences and left a crater 40' feet deep, 167' long and 26' wide. Source: http://activerain.com/blogsview/3459241/would-you-buy-a-perfect-home-next-to-a-high-pressure-gas-pipeline-