describe the community at the hot springs

From the text:

After a mile or so they arrived at a bizarre encampment, where some two hundred people had gathered to spend the winter living out of their vehicles. The community was beyond the fringe, a vision of post-apocalypse America. There were families sheltered in cheap tent trailers, aging hippies in Day-Glo vans, Charles Manson look-alikes sleeping in rusted-out Studebakers that hadn’t turned over since Eisenhower was in the White House. A substantial number of those present were walking around buck naked. At the center of the camp, water from a geothermal well had been piped into a pair of shallow, steaming pools lined with rocks and shaded by palm trees: Oh-My-God Hot Springs.

Franz describes the community beautifully....

“I thought he was too nice a kid to be living by that hot springs with those nudists and drunks and dope smokers.” After attending church that Sunday, Franz decided to talk to Alex “about how he was living. Somebody needed to convince him to get an education and a job and make something of his life.”

Describe the slabs.