Environmental health was called out to assess a diesel spill in Templeton Tuesday morning.
The call came in just before 9 a.m. on the 8400 block of Vineyard Drive, according to the California Highway Patrol.
A big rig reportedly leaked about 20 gallons of diesel onto the road.
CAL FIRE says the spill was contained but environmental health was called out to assess what kind of cleanup was needed.
The fuel was not believed to have gotten into any waterways.
Crews remained on scene as of 11 a.m. One lane was blocked in the area.