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Semi-truck crash spills hazardous material along SLO County road

An overturned trailer spilled hazardous materials including limestone powder and diesel fuel onto Chimney Rock Road road in rural San Luis Obispo County on Feb 17, 2025.
An overturned trailer spilled hazardous materials including limestone powder and diesel fuel onto Chimney Rock Road road in rural San Luis Obispo County on Feb 17, 2025.

An overturned semi-truck pulling a trailer spilled hazardous materials along a road in rural San Luis Obispo County on Monday morning, according to a California Highway Patrol news release.

Around 8:35 a.m., California Highway Patrol officers received a report of a vehicle overturned off the roadway on Chimney Rock Road east of Cypress Mountain Drive near Lake Nacimiento, the news release said.

Upon arriving on the scene, officers determined Luis Hernandezlopez, 29, of Bakersfield was driving a Peterbilt semi-truck towing a trailer of powdered limestone east on Chimney Rock Road at an unsafe speed, according to the release.

Hernandezlopez took a curve in the roadway too fast, causing the truck’s tires to break traction from the asphalt, slide off the south edge of the road and overturn, the release said.

Powdered limestone and diesel fuel spilled from the trailer and truck onto the roadside, creating a hazardous materials incident, the release said.

Hazardous material spill on Chimney Rock Road

Hazardous material spill on Chimney Rock Road

A semi truck overturned, causing a hazardous material spill on Chimney Rock Road east of Cypress Mountain Drive.

Map created with the assistance of ChatGPT.

Hernandezlopez suffered minor injuries, the release said. Chimney Rock Road was closed for approximately four hours on Monday for vehicle recovery and cleanup.

The crash is pending further investigation by the California Highway Patrol, but it was determined that alcohol and/or drugs were not factor.

Chloe Shrager
The Tribune
Chloe Shrager is the courts and crimes reporter for The Tribune. She grew up in Palo Alto, California, and graduated from Stanford with a B.A. in Political Science. When not writing, she enjoys surfing, backpacking, skiing and hanging out with her cat, Billy Goat. Support my work with a digital subscription
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