As I attempt to fill my personal D/T matrix with Unknown caches I quickly learned that the toughest combinations to find are the easiest so this is my contribution to that portion of the matrix. The cache is NOT at the posted coordinates in middle of the interstate so please not try to find anything there.
You will find the cache at the following coordinates:
North thirty-eight forty-six point four hundred sixty seven West one hundred twenty-one fourteen point four hundred twenty
To sign the log you WILL have to climb a tree. The cache is secured to the tree so you MUST climb. No TOTT is necessary. A small step may be helpful if your monkey skills are limited.