Yep, it looks very confusing up there.
For the new Catoosa County license
WQUG548, it adds 3 new 800 MHz frequencies to the location called Canyon Ridge in Trenton, GA, Dade County. This license was applied for in January, 2013 and granted in July, 2014.
Their existing 800 MHz license
WQKU453 is for 4 sites in 4 counties, one of which is Canyon Ridge. The other 3 sites have 11 frequencies but the Canyon Ridge site only has 6. My guess is they are adding 3 more 800 MHz channels to the Canyon Ridge site for the existing system. I'm also guessing these 4 sites in 4 counties are what's referred to as the Northwest GA Regional Radio System which in turn is connected into the Tennessee system.
For site 11 of the Tennessee system named Catoosa with 11 800 MHz frequencies, they are the ones for WQKU453 location #1 (Kittle Rd) in Ringold, GA for Catoosa County, location #2 (Taylors Ridge) in Lafayette, GA for Walker County, and location #3 (Dug Gap Mtn) in Dalton, GA for Whitfield County.
Site 80 of the Tennessee system named Dade with 6 800 MHz frequencies is WQKU453 location #4 (Canyon Ridge) in Trenton, GA for Dade County.
I hope I've got it close to correct.