Nonresidential uses in all zones which cause off-site impacts on uses in the residential, commercial and industrial zones are required to meet the standards of this subchapter. The following are exempted: machinery, equipment, and facilities which were at the site and in compliance with existing regulations at the effective date of these regulations. Any new or additional machinery, equipment, and facilities must comply with the standards of this subchapter. Documentation is the responsibility of the proprietor of the use if there is any question about when the equipment was brought to the site.