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know, the pressurization, depressurization bends it back and forth and back and forth, until it eventually breaks? or was it a fracture from impact, from excavation? >> reporter: and investigators now say they have found no hard evidence that neighbors formally complained about the smell of gas leading up to the blast. >> the real question is did it need repair, when is the last time it was expected, and it was inspected as early as march 2010. >> reporter: meanwhile, residents who suffered only minor damage are just trying to clean up and get their lives back in order on a street that is still anything but normal. >> and from neal karlinsky at the scene of that blast in california, we turn, now, to a question everywhere was asking all weekend long -- is there a way to know if there's a natural gas pipeline running under your house and how big is it, how old? barbara pinto tells us how some people found out. >> reporter: the incidents happen every other day in this country. >> it's something we need to get a clear handle on before it gets worse. >> reporter: in this san diego