Evacuation orders in the area of the Corral Fire near Tracy were reduced to warnings as of 6 p.m. Sunday as the fire held at 14,168 acres and 50 percent containment, according to Cal Fire. 

Residents are advised to remain vigilant and prepared for potential changes, however.  

Cal Fire said road closures would continue to be enforced for nonresidents on South Corral Hollow Road and Chrisman Road south of Interstate Highway 580.  

Interstate Highway 580 between Interstate Highway 5 and Interstate Highway 205 opened up again in both directions after closing due to the blaze, California Highway Patrol said at 7:30 p.m. 

The wildfire began Saturday at about 2:30 p.m. east of a Lawrence Livermore Laboratory site in San Joaquin County and reached 14,000 acres by Sunday afternoon.  

Residents east of Highway 580 between Corral Hollow Road and South Tracy Boulevard were the first ones told to evacuate by the San Joaquin County Office of Emergency Services. 

Two Alameda County firefighters were hospitalized for treatment of minor to moderate burns Saturday, said Cheryl Hurd, a spokesperson for the department.

The cause of the fire wasn’t immediately determined, Hurd said.

Site 300, covering 7,000 acres about 15 miles east of Lawrence Livermore’s main site, is part of the laboratory’s nuclear weapons stockpile stewardship program, according to its website.

The facility assesses the operation of non-nuclear weapon components through hydrodynamic testing and tests new conventional explosives for use as part of the nuclear stockpile, the laboratory said.

Bay City News staff reporter Janis Mara contributed to this report.

Note to readers: This story has been updated to reflect developments in containment as of the evening of June 2.

Katy St. Clair got her start in journalism by working in the classifieds department at the East Bay Express during the height of alt weeklies, then sweet talked her way into becoming staff writer, submissions editor, and music editor. She has been a columnist in the East Bay Express, SF Weekly, and the San Francisco Examiner. Starting in 2015, she begrudgingly scaled the inverted pyramid at dailies such as the Vallejo Times-Herald, The Vacaville Reporter, and the Daily Republic. She has her own independent news site and blog that covers the delightfully dysfunctional town of Vallejo, California, where she also collaborates with the investigative team at Open Vallejo. A passionate advocate for people with developmental disabilities, she serves on both the Board of the Arc of Solano and the Arc of California. She lives in Vallejo.