There are playground safety standards - a lot of them, and many of them include retesting on a regular basis - especially where there are padding requirements.
Two examples of elements that might be helpful:
24th St Mini Park in San Francisco
Topher Delaney's San Diego Children's Hospital
With that budget it might be better to work on a colorful surrounding and an interesting wall for kids with a big open space that allows them to use their imagination and play.
Jennifer A. Easton
Art Program Manager
BART
510.874.7328
300 Lakeside Dr, 22nd Fl
Oakland, CA 94612
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