UF cable and gas line in same ditch 1

[djake11]

If I bury a UF cable and gas line in the same ditch, is there a requirement for physical separation? If so, how much? Is there a NEC paragraph that can be referenced?
Thanks

 

[davidbeach]

It's done regularly, but the serving utilities probably have something to say about how it is done. Generally the electrical will be below the gas.