The cache is NOT at the posted coordinates. This is a bonus cache for completing the Adventure Lab, Welcome to St. George.
To find the actual coordinates for this cache, you will need to complete the Adventure Lab, Welcome to St. George. Navigate to each of the five locations in the Adventure Lab and correctly answer a question at each location. You will find the required letters for this bonus cache in the journal entries of the Adventure Lab.
The letters form a word. Enter that word into the checker.
You can validate your puzzle solution with certitude.
Congratulations to 13coach13 for FTF!