Saline Valley is a special place within the largest Nat'l. Park in the lower 48. Learn about the etiquette at the springs and enjoy a seriously wonderful place.
I would suggest having a container for collecting firepit ashes when you arrive. Then when you leave if your ashes are still hot you can feel good about at least leaving it like you found it. As noted there is a post about what is needed at the springs: http://forum.salinepreservation.org/post/camp-needs-4682056?trail=90