Trenching a Natural Gas line

[Muliemaster]

So I'm getting my furnace replaced soon so I figured I'd kill two birds with one stone. Since I'm getting permits pulled to have the furnace gas line work done, so I figure I'd get a line run to my garage. My garage is about 20' from the back of my house. The meter is conveniently at the back of the house too. I don't have the bucks to install a n.g. heater in the garage yet but I'd just like to have the capped line in my garage for future use.

So I figured I'd have the line trenched in time for the gas line fellow just to lay the line in. Cheaper for me to do it than a journeymen! Don't worry, Alberta First Call has been out already.

So - I've looked (not very hard, albeit) for the Alberta code depth for the line. How deep does the line have to be in my back yard?? Then - do I try to dig this by hand or can I rent a trencher from a Rona/HD type store?

I'm in NW Calgary BTW.

Thanks in advance for all your help.