Yes Eugene, they have installed solar toilets at Everest base camp around 20,000 ft. Some worked well, some not so well, depending on the design. All materials get scavenged as soon as the parties leave the mountain, but there are success stories if you care to do some research.

Nobody is suing here, or even threatening to sue, and nobody is forcing anything. The appeal is asking Inyo to finish the Environmental Assessment like they were supposed to. They dropped the ball and its time to pick it back up. An appeal letter has a specific format and content that must be followed, which is by nature somewhat legalistic, but required. The real purpose is to get them to assign resources to finishing the process. Without some kind of pressure, it won't happen.

Ironically, they created a technical catch for themselves by not finishing the EA. There is a 45-day window to file an appeal once the decision document is published. Since they never published an official decision document, there is no official time to appeal. Again, the purpose is to get them to assign resources to this issue, not to force anything.