1.   New Uses.  Any use established in the Commercial (C) or Industrial (I) Zones after the effective date of this chapter shall comply with the minimum performance standards contained herein.

2.   Existing Uses.  Existing commercial (C) and industrial (I) uses which are not in compliance with the performance standards contained in this chapter are exempt except where a use did not comply with performance standards in effect prior to the adoption of this chapter.  Conditions which do not comply shall not be increased in scope or magnitude.  Such uses shall be permitted to be enlarged or altered provided that the addition or change conforms with the applicable performance standards.

3.   Certification.  When necessary, the Building Official may require of the applicant certification by a registered professional engineer or other qualified person, at the expense of the applicant, that the performance standards for a proposed use can be met.