Annual report. Upon the issuance of a building permit for a wireless telecommunications tower site, the owner or operator of the site shall provide to the township engineer, township planner and township zoning officer, an initial report signed and sealed by a licensed professional engineer, certifying the estimated useful structural life of the tower as well as providing an initial inventory of all equipment and antennas on the site. After 50% of the useful structural life has lapsed, annual recertification reports as to the structural integrity of the tower shall be required. An updated report shall also be provided whenever antenna arrays are modified and shall include a detailed listing of all antennas and equipment. All antenna lessees shall also be required to notify the above Wantage Township officials when the use of such antenna or equipment is discontinued. If any of the reports disclose that a condition of any tower presents an imminent hazard to the public health, safety or welfare, or that the tower antenna and facilities are no longer in use, the owner of the tower or site upon which it is located shall, and the township engineer or zoning officer may order in their discretion, appropriate corrective action including, if necessary, the removal of the tower to protect the public health, safety and welfare. Wireless telecommunications towers and sites shall be maintained to insure continued structure integrity. The owner of the tower shall also perform such other maintenance of the structure and of the site so as to assure that it does not create a visual nuisance.