Dive summary:

• A garbage truck hit a riser leading to a gas meter yesterday causing a gas leak in Mountain View Calif. that shut down traffic and caused residents of 20 apartment units to be evacuated.
• If enough gas was to leak out of the pipeline a small spark could cause a firework like explosion.
• This is the second time the pipeline at the apartment complex has been hit.

From the article:

A strong odor of gas filled the air around the 700 block of N. Shoreline Boulveard Wednesday afternoon after a garbage truck stuck a natural gas meter, fire officials reported.

Residents of twenty apartment units had to be evacuated for safety, according Mountain View Fire Department spokeswoman Jaime Garrett. Police shut down southbound traffic on nearby Shoreline Boulevard. ...