Ok, sis says the only one she knows of is in Herald which is down near Galt. However she says she knows a local pg mama who is using a mw & she is going to try to get ahold of her to ask who it is. I'll let you know what she finds out.
Other resources to explore/people to ask about mw's:
Melanie Miner, a doula, used to be owner of Chrysalis Birth Services. She held classes out of the Holistic Health Center of San Andreas. I don't know if she is around or if the Center is still open but as of '03 the number there was 772-0511. At any rate if you can find some local doulas, they may know of any midwives in the area.