As a condition to continuance of any building,
process, installation, production or other use in any commercial or
industrial zone, the applicant shall supply evidence, satisfactory
to the Planning Board or to its designated representative, that the
proposed use will conform fully to all of the applicable performance
standards stated herein. As evidence of compliance, the Board may
require certification of tests by appropriate government agencies
or by recognized testing laboratories, any cost thereof to be borne
by the applicant. The Planning Board may require that specific devices
be installed and that operating procedures be followed if governmental
agencies or testing laboratories determine that the use requires such
in order to assure compliance with performance standards.