Because of the pattern and the locality I think, it is an San Diego gopher snake - an annectens (color and the amount of blotches) with some influence of deserticola (gray wasch in groundcolour and a "nearly" closed stripe on the side of the neck).
The subspecies catenifer (the pacific gopher snake) lives more northern in direction to the coast and (most of them) have fewer blotches. A little more to the south and west the subspecies affinis lives, but of this I can't see any influence.
Bernd
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