Thanks for your question.

There is no “safe” way of removing these critters if you mean by this preserving their safety. They have found, presumably, a good home and will continue to come back to it. In looking at your pictures I don’t believe that moles are the culprits. More likely gophers. You could try to trap them and transport them to another location. However this simply means (“Nature abhors a vacuum”) that other gophers will just move in. Are they really causing a significant amount of damage at this time to your garden or is this more a cosmetic issue? You’ll need to decide what your priorities are. You could hire an exterminator who will either trap them or put out some poison. Take a look at the following as they might give you some other ideas:

https://www.havahart.com/gopher-facts

https://www.pestnet.com/rodents/pocket-gopher/

https://www.wikihow.com/Get-Rid-of-Gophers

Good Luck!!