The poco will specify sch. 80 out here for any of their risers, especially when extending up a pole. It's also the only thing I'll use under a roadway, as rigid metalic tends to desintigrate in corrsive soils out here.
If you don't have a supplier for shc. 80, you should probably try to find one.
I just red flagged someone today because he had sch 40 running up the pole instead of sch 80. Beside that they back filled the trench where the service pipe ran. they just left the end open for me. Wasn't that nice of them! LOL Oh yeah, the house was closed up and I heard dogs barking in there and 2 great big notes on the job site pleading with me to do a service inspection. Maybe next time.
Sch80 is required for just about any exposed service conductor (RNC) raceway I can think of here. Usually we can get away with backfilling the trench if you stick several stubs of conduit down to the pipe along the way that the inspector can measure. In this sand, the trench will backfill itself if it rains and it pretty much rains every afternoon in the summer
