How open are gas lines usually buried? We are sinking a pole to mount a satellite dish.

We are sinking a pole to mount a satellite dish.
Where do I find parts for my snowblower?
Answers:    According to the International Fuel Gas Code, they are supposed to be at least 12" below the ground and to gas grills, courtyard lights,etc. 8".
I am doing some Electrical work work around...
The lines coming up to my house are about 3 foot deep. I know because the gas company come out and dug it up due to a leak. Don't know around water.