Propane Gas Line Under Concrete Slab

A truck delivering your propane could crack the concrete covers and lids that protect your septic tank.
Propane gas line under concrete slab. I d really like to come up with the gas line inside the barn in the wall ideally so that the black steel pipe will be hidden thru a concrete slab that will soon be poured. Drain and sewer cleaning. Look for overhead power lines upon installation. Gas line in sewer.
Low hanging lines make it difficult for drivers to navigate. Under slab gas line. Lead 90 flush with concrete slab. I know there could be a leak under the slab but there is only around two pounds of pressure in the gas line it seems unlikely gas would force it s way out if it was surrounded by compacted soil or in concrete.
I m traveling but presume he thinks the required tracer tape will be fished along with the propane line. His idea is that the propane company will fish the propane line through the conduit. Gas pipe to kitchen island under concrete slab. My contractor buried a schedule 40 conduit 18 deep under the gravel bed underlying what will be a flagstone patio.
How do i attach a new flange. Code seems to want the pipe to come up on the outside with a riser and seems opposed to entering the building in the wall or even thru a liner of some kind because of. If you receive a delivery when it s dark outside or if the lines are hidden by trees your driver may not see the lines at all. The propane line is for a fire pit.