(A) The economy and desirability of the combined treatment of industrial wastes and sanitary sewage is recognized. However, not all types and quantities of industrial wastes can be so treated. It is the policy of the city to admit to the sanitary sewer system only those types and quantities of industrial wastes that are not harmful or damaging to the structure, process and operation of the city sanitary sewer system and that are not specifically prohibited by this chapter. To provide treatment for industrial wastes may require additional facilities, the cost of which should be borne by the industries which necessitate the additional facilities for their waste and therefore receive its benefits.
('82 Code, § 3.371)
(B) The types and quantities of industrial wastes which may be admitted into the public sewer system without pretreatment shall established by the City Engineer and approved by the Council.
('82 Code, § 3.372)
(C) In order to control the admission of industrial wastes into the public sewers, no person shall discharge or cause to be discharged any of the following waters or wastes into the public sanitary sewers, except upon approval of the Council:
(1) A five-day, 20° C., BOD greater than 400 mg/1;
(2) A suspended solids content greater than 350 mg/l;
(3) A chlorine demand greater than 15 mg/l;
(4) An average daily flow greater than 10% of the average daily sewage flow at the sewage treatment works;
(5) Any toxic substance; or
(6) Any waters or wastes which are determined by the Engineer to offer possibilities of harm to the structures, process or operation of the sewage works.
('82 Code, § 3.373)
(D) Any person desiring to make a new connection to the public sanitary sewer system for the purpose of discharging industrial wastes, and any person desiring to discharge industrial waste through an existing connection, shall complete and file with the City Engineer a questionnaire furnishing pertinent or predicted data upon the quantity of flow and an analysis of the industrial waste to be discharged before making the connection or discharge. The Engineer may, at any time, require that a user discharging industrial waste complete a questionnaire showing current discharges. Upon notice from the Engineer, the user shall furnish the data within 30 days of the mailing or personal delivery of the notice.
('82 Code, § 3.374)
(E) Samples shall be obtained at the times and in the manner as will be representative of the actual quantity and quality of waste, and in all events shall be collected over a three-day period of operation or more. Samples for analysis must be collected by the Engineer or by a person approved to do so by the Engineer. Analysis of the sample shall be made by a qualified sanitary engineer using commonly accepted analysis techniques.
('82 Code, § 3.375)
(F) Any user discharging industrial wastes into the public sanitary sewer system shall install a suitable control work hole in the building sewer to facilitate observation, sampling and measurement of all waste, including all domestic sewage from the establishment. The work hole shall be installed in accordance with plans approved by the City Engineer and shall be of safe design and in a readily accessible location. The work hole shall be installed by the user at the user's expense and shall be maintained by the user so as to be safe and accessible at all times. In the event that no special work hole exists, the control work hole for taking any samples shall be considered the nearest downstream work hole in the public sewer from the point where the building sewer is connected.
('82 Code, § 3.376)