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Fit a curve, this pipe was pieced together by small sections called pups, each one forging a turn in the pipe, each one offering investigators another decades-old welding job that could have been a weak point. the fact that it occurred when it was unexpected, when there s no obvious explanation for it, there was no precursor event, there was no earthquake that we know of, there was no heavy construction in the vicinity that we know of, we don t know of any impact against the pipe, it s very mysterious, and it makes it important that we understand the cause of this. we ve heard reports of residents saying that they smelled gas and called us beforehand. we have combed through our records for the month of september, for the nine days of september before the event, and we have not found anything in our records that would indicate that people called for that specific area. reporter: pg&e officials were iousen ts ag represis smelled gas er anng ....