u/Illustrious-Motor859

Working on roughing in some plumbing for a pole barn. From front to back. Toilet, sink, sink, toilet so far. The final two fixtures in the back will be another sink and small shower. This is all going to be loaded up with gravel and then concrete. I opted to lay down a bed of gravel first as opposed to digging a trench. Every fixture is vented and I'll pressure test before I bury it. What else should I be concerned about.