How to plumb a washing machine 30 ft from the waste stack?
1/4" per foot of slope is generally considered the minimum slope, so as long as you have a bit over 7" to work with vertically, you should be able to slope the drain over 30' just fine. You'd set up your discharge p-trap, and then vent immediately after that...tying that back to the main vent stack. So you'll end up with two 30' feet runs of pipe (drain + vent). 

Obviously, check with local plumbing codes for specifics. 

This all assumes you have water hookups in that location. If not, then you'll have to get those over there as well.