The geocache is not at the posted coordinates.
This is a Bonus Cache for anyone who completes the River City Adventure Lab. Each of the five stages in the Lab displays numbers for the final coordinates. The total of the digits given during its completion is 48.
The cache is well hidden from possible muggles enjoying the area. The container can easily handle small swag and trackables.
Bonus location: N36 AB.CDE W076 FG.HIJ