what situations dictate locating underground utilities??? 1.renovating a lawn with skidsteer 2.planting large trees 3.grading 4.installing patios or retaining walls 5.installing small (3gal) shrubs??? i think that gas lines are usually 30in below the surface. what about all other utilities??? if u do hit something, what are some steps to take to correct the problem? -try to fix yourself or call gas company or elec comp etc.