The authorized City representative and other duly authorized employees of the City, the State Department of Natural Resources and the U.S. Environmental Protection Agency, bearing proper credentials and identification, shall be permitted to enter all properties for the purposes of inspection, observation, measurement, sampling, and testing in accordance with the provisions of these Sanitary Sewer chapters. The authorized City representative or other persons noted above shall have no authority to inquire into any processes including metallurgical, chemical, oil refining, paper, or other industries beyond that point having a direct bearing on the kind and source of discharge to the sewers or waterways or facilities for waste treatment.