BoJaB: Archiving. Appears to be placed against the guidelines. You did receive permission from the land manager to have a cache at this location, but I don't see where you mentioned how you hid it to the land manager. The guidelines for archiving are below.
Inappropriate or Non-publishable Placements
http://www.geocaching.com/about/guidelines.aspx#propertydamage
Caches are placed so that the surrounding environment, whether natural or human-made, is safe from intentional or unintentional harm. Property must not be damaged or altered to provide a hiding place, clue, or means of logging a find.