I was also thinking a King snake. I'm more familiar with the local species here in VA. I can tell you that one is non-venomous. All venomous species in the US have triangular heads except for the coral snake, which looks very different from that one. Also, I don't think coral snakes are native to CA.
Edit: took a quick look online, not a King snake. Looks like a racer as mentioned in the earlier post or a juvenile rat snake.
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