I am building a small barn and I am planning on running a 4 wire 120/240 volt branch circuit with 2 AWG Type USE wire. I have a trench app. 30 inches deep (exceeding the 24 inch direct burial requirement) and I want to put my branch circuit wire, a 3/4 inch water line and a direct burial type of phone line all inside one 4 inch flexible conduit. Would this be permissible since I am below the 24 inch direct burial requirement. The phone line will be tied into the existing phone circuit in my home.