VENTURA (CBSLA) — The first big storm of the season started to drop rain Monday on areas burned just weeks ago by the largest fire in California history, prompting evacuation orders and a rush for sand bags to protect against mud flows.

Mandatory evacuations have been ordered for the residents of Matilija Canyon to North Fork and Wheeler Gorge. Residents from those areas should leave immediately, as significant rainfall is expected that may result in mud and debris flows in those canyon areas.

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The possibility of toxic waste from burned out homes and cars are also a concern for lower-lying homeowners.

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“Last night was my first night back since the fire,” homeowner Kathy Asher said. “That’s why it’s so hard today to start thinking about leaving again. When you look at it and think, ‘could these things like cars and things really come down?’  I got a house right above me that’s totally burnt.”

Voluntary evacuations have been ordered for Casitas Springs, Nye Road, La Conchita, and the area west of Thomas Aquinas College along Highway 150.

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Folks under evacuation can go to Ventura City College gymnasium at 4667 Telegraph Road.