Help with Naked Edges - Boolean Commands

Hey! I’m currently working on a site model and I’ve been using the rebuild command to build topology from a planar srf, and then extruding them with the loft command. There appears to be a couple of naked edges and I have no idea how to fix them. Any help would be much appreciated!
naked-edges-help.3dm (2.6 MB)

you are working too hard.

start from the surface, extrude down with gumball, then scale the lower surface to zero with gumball to make it planar.