(A) (1) Any industrial wastes discharged into the public sewers shall be subject to periodic inspection and determination of character and concentration. The examination shall be made as often as the Superintendent deems it necessary (but at least once a year) and may include the use of suitable continuously monitoring instruments in appropriate cases. Samples shall be collected either manually or by approved mechanical devices and in such a manner as to be representative of the overall composition of the wastes.
(2) The sampling period shall be for a period of at least seven consecutive days. When the sampling program extends for more than seven consecutive days, the city may select the seven consecutive days of its choice. Every care shall be exercised in collecting the samples to ensure their preservation, until analyzed, in a state comparable to that at the time the samples were collected.
(B) The installation, operation and maintenance of the sampling facilities shall be the responsibility of the person discharging the wastes and shall be subject to the approval of the Board of Public Works and Safety. Access to sampling facilities shall be granted at all times to the Superintendent.