I live in West Virginia where we are flat-ground challenged! I have a fairly small front yard. I need 3-250' vertical loops 15 feet apart for a 3 ton unit. Space is at a premium. How close to the house, patio, sidewalk, driveway can they drill? Does it create lots of vibration during the process? The back yard is not really an option (drops off at nearly 45 degrees). Thanks in advance. Fred H.