This question relates more to surrounding obstacles than actual lines, but it's about underground lines nonetheless. So a new tree, silver maple, was planted this year in what was going to be my straight run to the house for underground lines. I can cross the yard at an angle but how far from that tree should I be to avoid root problems in the future? I plan on either doing "foam in trench" lines or thermopex and they will be 4 feet deep when the time comes.