That should be a pretty good resource. Given the engineering
requirements
for assuring earthquake survivability, the specifications listed by
the CA DOT will probably be as stringent as one can find. The only
other possibly more stringent requirement would be for construction in
areas of heavy clay.

There are plenty of BOTH in LoCal. My lot was a red clay pit with half
an inch of topsoil tossed on.


And mine is black & grey clay. But I've built the topsoil up quite a bit.
There's lots of 'byproducts' from this hobby composting behind the shed.

Patriarch