No person shall place or maintain upon the ground in any public place any stone, concrete, brick or other impervious material or substance that would, in the judgment of the Director of Public Service or his designee, obstruct the free access of air and water to the roots or any tree upon any public place in the City, unless authorized by the Director or his designee. There shall be maintained around the base of the trunk of each such tree at least nine square feet of open ground for a tree three inches in diameter, and for every two inches or increase of such diameter there shall be an increase of at least one square foot of open ground. Open ground must be mulched with a two to three inch depth of shredded oak bark or other natural aged mulch and shall not be in contact with the trunk of said tree.
(Ord. 2009-8. Passed 2-3-09.)