Any advice for grading over a gas line at a residence? I had a call asking to remove about a 8" depth of clay soil so that amended soil could be added to start a garden area. I would have Miss Utility locate and mark the line prior to any grading and would hand dig at one spot to verify the location/depth of the line which I'm assuming should be at least 2' deep. Anything else I should consider or be aware of? I haven't done any "excavating" directly over a gas line before and I've read enough stories here of things gone wrong. I'd rather ask the "dumb" question now then tell how I blew up my machine later (I know, it takes all the fun out of it). I'm planning to look at the job and give an estimate this weekend. I would use an RC50 so machine weight shouldn't be an issue. Thanks.