905.02 FAILURE TO COMPLY.
   (a)   In the event that an order to treat or destroy a tree is not complied with as per its terms, the Clerk is authorized through the proper City department to enter upon such private property and to spray or to otherwise treat or remove such tree or the infected or dangerous parts at the cost and expense of the City. Such entire costs shall be lien upon the private property.
   (b)   Where the Clerk ha caused work to be done pursuant to subsection (a) hereof, he shall ascertain the total cost of the work and shall bill the same to the owner at his address, it is be known; otherwise, to the owner in care of any person living upon or having charges of the premises. If the address of the owner or any person having charge of the premises is unknown, and the premises are vacant, then the bill shall be presented by posting it in a conspicuous place upon the premises. The bill shall be payable in cash at the Clerk’s office within thirty days from the date of its delivery or posting.
      (1)   In computing the cost, if the work has been done by contract, fifteen percent (15%) shall be added to the contract price as a reasonable overhead charge to pay for service of notice, inspection and other incidentals.
      (2)   If the work has been done by regular City employees, the cost shall be arrived at as follows:
         A.   The time expended by the employee shall be charged at the same hourly rate as the employee’s wages.
         B.   Fifteen percent (15%) shall be added to the time cost so found, as a reasonable overhead charge to pay for the cost of the equipment, service of notice, inspection, supervision and other incidentals.