Why put the electric at 4 and water at 6. If I already had a trench at 6 feet I'd just run the wire next to it. It's only like 4 more feet of wire. Then if you ever need to dig you know where everything is. Also didn't the line get tested before burying it? Break the line at the house rig a cap to allow you to put compressed air in the line. Put 10psi in the line. If it holds it's likely a block if it bleeds off pressure it's a leak.