Thank you all! Yes, you are correct in your advice to measure from the top of pool wall. We ended up calling a local installer and he advised the same and we measured and I'm happy to report that our pool is in fact level (within an inch) - thank goodness, I was stressed for a bit but as a new AGP owner I have a lot to learn. From the inside of the pool the ground is a bit unlevel but nothing too crazy. Thanks again.