Over 40 gallons of diesel has spilled from a big rig on the 5 Freeway in Castaic, prompting a hazardous materials response, officials said.

The incident was first reported at about 2:20 p.m. Monday on the northbound 5 Freeway near Hasley Canyon Road, according to Leslie Lua, spokesperson for the Los Angeles County Fire Department.

“Our units responded to reports of a big rig leaking fuel on the right shoulder,” Lua said.

The big rig reportedly struck a metal object on the freeway which ruptured a fuel line, according to California Highway Patrol (CHP) logs.

Upon arrival, firefighters found a metal pipe in the big rig, with an active leak of 40 to 50 gallons, according to Lua.

A hazardous materials unit from Los Angeles County Fire and officials from the California Department of Transportation (Caltrans) were requested to the scene, Lua said.

Traffic on the northbound 5 Freeway in Castaic is impacted due to the clean-up of the spill, according to the CHP.

The No. 4 lane of the northbound I-5 near Halsey Canyon Road is closed for an unknown duration due to the spill, according to CHP logs.

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