Rock Springs is closed to the public. Access has been arranged by the Cambrian Foundation.
http://www.cambrianfoundation.org/rock-springs/
Apopka Blue is owned by the City, and from what I gathered from my conversation with the manager of the site, they're only interested in allowing the Cambrian Foundation in there to dive. It's a very risky sneak dive, too, very close to a neighborhood with neighbors known to call the police. I've heard (second hand) this system is known for sand slides and collapses, so if you do decide to dive it, be careful.
http://www.cambrianfoundation.org/apopka-blue-overview/
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