You will need the remove the right side cv shaft and right side splash shield to access and remove it:
Fig. Alternator mounting-3.0L engine
Fig. Front halfshaft
NOTE If removing the intermediate shaft in order to repair a separate component, it should only be removed as an assembly with the right front halfshaft.
Fig. Intermediate shaft
Sorry, forgot to add that. Here you go:
use a 1/2" drive ratchet or breaker bar and insert the square drive into the square hole in the belt tensioner and rotate counterclockwise to release tension on belt to remove