Check out this thread:
Read back to the first page. My buddy used a skid steer to move all the snow around, all 17 truck loads of it. All of that snow was from a parking lot to, so it wasn't the cleanest snow. If you're using the snow from your yard, that's pure stuff. As long as you have frozen ground, and a decent layer of snow, you won't hurt anything by being in there with a shovel and your boots.
Then read forward to my latest post and pictures. Grass is very alive and very well, hardly any gravel. And that was 3 weeks ago already. Shits green now. Has to be one of the best examples of doable, and yard safe a setup is. If that much snow, that much equipment, and it being shredded pretty hard isn't, then I dunno what is.
"Well, if Rimjobber were to insert dildos up your bum for every terrible thread that you have made, he would have shoved up so many that they would start to come up your trachea. But as they got closer to coming out your mouth, Rimjobber would have ran out. But when he went to the dildo store, they would be fresh out of dildos and he would have to remove one though you mouth and re insert it in your bum to continue the punishment, thus resembling a stack-able pencil." - JakeSmith