Meanwhile, the National Transportation Safety Board (NTSB) and Pacific Gas & Electric (PG&E) are investigating the explosion and claims by residents that they reported smelling gas in the air before the explosion. PG&E reportedly said it has not found any records of customer complaints in the area.
Residents, however, told local reporters they saw PG&E technicians in the area and were told to shut their door and their garage to avoid the smell of gas. It is currently not known how many calls PG&E received from the area reporting the gas smell prior to the explosion or what repair work was done in the area, if any.
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The Los Angeles Times (09/11/10) cited Christopher Hart, vice chairman of the NTSB giving measurements from the blast: a 28-foot section of pipe was reportedly blown 100 feet. Meanwhile the crater caused by the explosion was 167 feet long and 26 feet deep.
The Mercury News (09/11/10) reports that PG&E has not confirmed when the pipe involved in the explosion was last inspected. According to the paper, PG&E has had 132 significant incidents between 1986 and August 2010, involving 18 deaths and 64 injuries. PG&E was also cited for improperly training field crew in using gas-detection equipment.