We're drawing to a close on our 3-day rock removal marathon, and in parts of the pool we're hitting moist clay. The dump truck guy has been saying he thinks we have marine clay (which I don't think, being we're 100+ miles from the ocean, at the very top of a hill, no marine clay marked on the county's soil maps and with no problems with any of the neighboring homes' foundations -- including ours). I'm inclined to think that the soil just hasn't been able to drain d/t all the rock in the ground. So anyway, the dump truck driver has been talking all gloom-and-doom about how we're going to have to dig until we get to dry ground, then backfill with gravel...which could be another week's worth of digging with all the rock we have. Haven't talked to the pool guys yet (I'm honestly afraid to bring it up!), but even if this is expansive clay, doesn't the PB factor this in with drainage and perhaps sump pump, w/o having to dig further? Otherwise, I'm afraid that the excavation is going to cost more than the pool...