Any operation, use, obstruction or structure existing at the time of enactment or affected by subsequent amendment of this chapter but not in conformity with its provisions may be continued subject to the requirements of Article III of this chapter. The burden of proof of establishing the existence of said nonconforming use shall be upon the petitioner.
Any operation, use obstruction, or structure which does not conform to the provisions of this chapter or subsequent amendments may not be:
A. 
Changed to another nonconforming location and/or operation.
B. 
Reestablished after discontinuance for one year.
C. 
Rebuilt or repaired after damage exceeding 50% of the reconstruction cost.