A.
Within the zoning districts established by this chapter or subsequent amendments thereto, there exist or will exist certain nonconformities which, if lawful before this chapter was passed or amended, may be continued, subject to certain limitations.
B.
Nothing contained herein shall require any change in the plans or construction of any building or structure for which a permit was granted prior to the effective date of this chapter. However, such construction must commence within 30 days after this chapter becomes effective. If construction is discontinued for a period of six months or more, further construction shall be in conformity with the provisions of this chapter for the district in which the operation is located.