Just another alternative for the next person, we had to raise the entire area up 6" and so far it appears that it will work well - we used Class 5 fill (also called Class 13 in other areas - used for parking lots, roads - packs and dries HARD) Used a plate compactor x6 times over the area by quadrants - extended 24" out from pool frame with a very slight slope on the edge for drainage, framed by 6" high x 2" thick concrete edgers.