The owner of any industrial plant where waste is created or discharged shall allow the employees of the Department ready access at all reasonable times to all parts of the property for the purposes of inspection or sampling or for the performance of their duties. The Department shall have the right to set up on the owner's property such devices as are necessary to conduct sampling or metering operations. Where an owner has security measures in force which would require proper identification and clearance before entry into the facilities, the owner shall make necessary arrangements with its security guards so that upon presentation of suitable identification, personnel from the Department will be permitted to enter without delay for the purpose of performing their specific responsibilities. While performing the work, the Department personnel shall observe all safety rules established by the owner and applicable to the plant or facilities. The Department shall have no authority to inquire into any processes including metallurgical, chemical, oil, refining, ceramic, paper, or other industries beyond that point having a direct bearing on the kind and source of discharge to the sewers or facilities for waste treatment.