My favorite from the list is Deep Creek Volunteers for the reasons EastBay gave, plus because it's the shortest. Second choice would be Deep Creek Hot Springs Conservancy (or just Deep Creek Conservancy), and third would be Deep Creek Hot Springs Alliance (or just Deep Creek Alliance).
I think we could use a few more suggestions for names, though. They all seem a bit unwieldy and official, and I haven't seen one with a good acronym. How about Spring Cleaners for a more humorous effect? Or for an acronym, POOLS: (People Often Overlooked Lugging Sacks). (Sacks of trash, of course). Okay, that's a bit long. US: United Soakers...and it even sounds patriotic.
Just a few thoughts. If the list of names is reopened, then I'd like to vote for something funny or with a good acronym, such as the suggestions above. If not, then take my vote in the first paragraph.