Tortoise or turtle found in Corona, CA

I just found this tortoise or a turtle at the corner of Fullerton and Haley Talbert on my way down to Chase. I was taking a walk, and this tortoise/turtle was sitting on the walkway under the sun with no shade looking at Fullerton Rd. He (or she) looked like as if he was about to cross the busy street. I tried to check with the house that was at the corner, but because the outside gate was locked, I couldn't reach the the doorbell. I hope I could reach the owner.

In the meantime, can...

Tortoise or turtle found in Corona, CA