In order to find this cache you will need to do the following.
1. Find the sculpture pictured
2. Locate the artists signature and the four digit year the sculpture was created
Project a waypoint from the sculpture:
(Dedication Year minus 1861) feet
(Dedication Year minus 1758) degrees true
The projected waypoint will bring you to another sculpture by the same artist. Once you find this sculpture you will be looking for the "Barn Door".
Place your right hand on the "Barn Door" and look under the "Arm Pit". You will see two trees just to the right of a large door. The cache is hidden just behind the two trees. You are looking for a preform in the plumbing.