That looks like a very typical Arizona boarding situation to me. I would almost bet that is down in Phoenix or outlying area.
Actually, from the description, I expect the manure build up to be worse!
It is so dry down there, that at one or more places I boarded, we would just rake manure from one end of the stall to the other, and it would dry out and be like saw dust in no time. Especially in summer, that is very typical. And then the horses isn't eating off the sand (but I always had my own feeder). So yeah, for better or worse, that doesn't surprise me at all.
The lack or water would worry me worse. When it is 115 degrees outside, I don't want my horses without water EVER. Even for 1/2 hour. They may not drink it constantly, but I always want them to have access to it.
And I would also want my horse to have a sun shade. But I have also known of places that didn't.
So yeah, typical AZ boarding situation. I'm sure that would run you close to $200 a month (including alfalfa hay, which is nearly the only kind you can afford and get). I used to pay around $125 a month 15 years ago. But hay has doubled in price since then!