Help! Fiberglass pool leaking from main drain and skimmer after rains

[mr2step]

Thanks for the input. Yeah I could understand why you would think about the pool "floating" however I don't think that is the issue, though not saying it isn't a possibility for this reason. We have amazing soil so drainage is outstanding. We rarely ever have standing water unless we get heavy rains of like 3-4 inches an hour but even within an hour of stopping the puddles absorb. I have also never had this problem before after rains so it probably would have happened by now in the 12 yrs since install I would have thought. The reason I ask about the hydrostatic valve is as you mentioned. I had read it can get stuck with possible debris or just get old and then let water out. The problem is which I mentioned in the OP is that I only have a main drain in the deep end but it is in the wall. There is no access to the piping other then the 1 1/2 pvc pipe opening. This is why I cannot tell if we even HAVE a hydro valve or not to access. My pool is leaking and it is sudden as I mentioned. It holds 30 lbs of pressure with the exception of the skimmer which does now. I know that leaks. But the drain is also leaking which DOES hold pressure per the pool guy as do the return jets. The funny thing is that it leaks 2 inches day via the drain when NOT running. I am noticing bubbles in the suction lines so am thinking maybe a suction leak somewhere? Would that be possible? Would a suction leak not be detected on pressure testing? I am just looking for some information. I am sure there may be more then one leak and am not using this forum to "diagnose" the leak but just for information on possibilities to look into. Thanks for the input!
Also, do you think it is possible for the main drain and skimmer to share a common line until they branch off again headed back to the pump?

[PoolDoc]

Hydrostatic valves only open when the pressure OUTSIDE and UNDER the pool is considerably greater than the pressure INSIDE the pool. This can only happen when ground water levels are a foot or more higher than pool water levels. So . . . if your soil drains like you say, any hydrostatic valve could not have opened.

Put another way: conditions that would open the valve, would be even more likely to float the pool!

If it leaks MORE when the pump is OFF, than when it is on, it's even more likely you have a cracked underground suction line. In such a line, when the pump is ON, the pressure inside the pipe is reduced, thus reducing the leak.

. . . Still sounds like a popped (floated) pool to me.