california laws for pay?

going to be doing a travel assignment for 8 weeks in california. I know that the agency has their own contract with each hospital but I was wondering what the laws are in california? I know after 8 hours in a shift it is time and half but is there usually time and half after 40 hours? or I have heard double time from people as well. Any help? Also if anyone knows of any hospitals one should stay away from in sacramento or martinez?