You can email info@ksreptiles.com and get some information. They are a reptile sanctuary in Poulsbo, WA but they also work with reptile orginizations in California when it comes to placing their turtles and tortoises. I work for the sanctuary and have just re-homed my Sulcata Tortoise to Southern California and it was a great experience. Just email Kindered Spirits and Lily should be able to give you the name of someone in California that will be able to work with you in finding a suitable "wild" home for your turtles.

Good luck.

Educating the public is the only way to prevent this from happening.