I'm starting to build a raised garden right over where the line runs, and I need to dig a few inches for the first course of the retaining wall. Of course I'll be digging carefully, and I'm just using stacking concrete wall blocks -- just in case we want/need to move the garden later.
So just how careful do I need to be? I'm not using any heavy machinery (just shovels) and I'm digging only a few inches. Is there any reason to believe I may hit or break the conduit?