Of course PG&E is responsible. Residents of that neighborhood have been complaining for WEEKS about the smell of gas. See this NBC report:

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A story like this underscores why we need more lower paid firefighters rather than a few over paid firefighters who commute in once a week. Give the lower paid firefighter reduced home loans so they may live in the city, rather than giving such loans to the fat cats.

When the next earthquake hits...