Both Alameda County and Livermore-Pleasanton fire departments responded to reports of an explosion at the Granite Construction Company in unincorporated Pleasanton just before 9 a.m. last Friday.
County Deputy Chief Dave Lord said that while residents may have heard a loud boom, it is unclear at this time whether the incident at Granite Construction Company, located at 1544 Stanley Blvd., was an explosion.
During the response, Lord said crews put out the fire quickly, within 15 to 20 minutes, and no injuries were reported.
"We don't got there that often, so accessing it was a challenge, but it wasn't that big of a deal," he added.
While there were no damage estimates yet, he said it didn't seem to be significant. Operations were shut down for a period of time, but started back up, although the involved equipment was out of service, he added.