Send 3 day notice now. You can change your mind later about eviction, but you have to show tenant you mean business. Put everything in writing to satisfy notice requirement in eviction.
http://www.car.org/legal/miscellaneous-contacts/ca-re-magazine-legal-column/Sept2013/
http://www.car.org/legal/miscellaneous-contacts/ca-re-magazine-legal-column/Sept2013/