pressure testing pool plumbing before gunite
Please help me before my pool builder gunites my pool. He has pre-plumbed the pool. In another post, I explained that the pvc for the deep heat returns and main drains are sitting under the rebar but on top of the gravel. Almost all pre-gunite pics of pool builds I see have the pvc pipe buried in the soil or gravel with only the stub-ups visible coming straight up out of the pool floor under the rebar. It doesn't seem right that mine aren't buried- I am concerned it will weaken the floor where there will be less gunite displaced because of the pvc lines.
My new question is, how long should the pre-plumbing be pressure tested before it is sealed up with gunite. My pb plans on gunite this Monday (3 days) but the trenches aren't dug yet, undergraound pvc not placed, pumps are not hooked up and there has been no pressure testing done (at least no ongoing pressure testing that I have seen). I have read of pressure testing going on for many hours or days prior to gunite. What is correct or reasonable? I don't want him to seal up the pipes in the pool until it is certain there are no leaks.
He may be coming tomorrow to dig the trenches, but that is not certain-maybe he will put pvc down and an equipment pad with pump tomorrow. I don't know. The only certain thing I have been told is gunite in 3 days. Please let me know what is reasonable so I know how to approach my pb if there is a problem. Thanks.