Unless there's way more than what is shown on the map, 500 people would kill each other in that space if they had to stay for more than a couple of months.
Septic tank is waaaaaaaay too small. Gasoline stored next to the water? They'd have to hot cot those bunks - only 6 buses for sleeping area and the kids' sleeping area is on the other side of the complex from adults. Lots of good planning, but lots of it isn't practical either.