A ranger from Mt. Diablo State Park called the San Ramon Valley Fire Protection District at 4:54 p.m. July 1 after spotting the grassfire, which was west of Collier Canyon Road in Tassajara Valley.
The first round of firefighters arrived at the scene 15 minutes after the call, said Battalion Chief John Viera. Approximately 70 firefighters worked together to douse the fire. Ten fire engines, two dozers, two hand crews, and a helicopter helped bring the fire under control by 6:15 p.m.
Viera said fighters used hose lines, foam and fire retardant from an air tanker to quell the blaze. He noted the cause of the fire is still under investigation. There were no injuries.
-Jordan M. Doronila