I am putting down a concrete walkway in front of my house. The walkway will be 3.5' wide and about 25' long. I have already dug down and compacted the soil, then I added 4" of item-4 and compacted that too. Now I'm getting ready to set up my forms, lay down the wire mesh and rebar, then add the 3000 psi concrete that's being delivered.
The one obstacle I have is a pvc sump pump discharge pipe that runs through the path (see picture below). The pipe is 1.5" in diameter. My original plan was to take a 3" pvc pipe and trim off the bottom so that the larger pipe covers the discharge pipe. I figured that if the original pipe was encased in concrete and I ever had to work on it, the larger pipe would allow me to slide out the smaller one. However the pipe is close to the surface. If I stay with my original plan there would only be 2-3 inches of concrete on top of the pipe. I'm worried that the pipe will create a weak point and crack the concrete.
A friend I spoke to suggested that I remove the item-4 from around the larger pipe and let the concrete fill the area. But I wanted to check in with you guys before going forward. Does anyone have any ideas to help me with this pipe issue?