This part of the rules and regulations concerning water pollution places certain restrictions on the types, concentrations and quantities of contaminants which can be discharged into sewer system in the state.
(A) Any wastes discharged to any sewer owned by any municipality, any county, or any sanitary district in the state shall meet the following criteria in addition to any established by the municipality, county or sanitary district itself:
(1) Liquids, solids or gases which by reason of their nature of quantity may cause fire or explosion; or be injurious in any other way to sewers, treatment works structures or to the operations of the treatment works; or cause a safety hazard to the personnel operating the treatment works, or cause the effluent from the treatment works to violate applicable effluent standards are prohibited;
(2) Solid or viscous wastes which cause obstruction to the flow in sewers or other interference with the proper operation of any sewer or treatment works are prohibited.
(B) Mercury, STORET number — 71900.
(1) No effluent to any public sewer system shall include mercury (Hg) or any of its compounds in excess of 0.0005 mg/l as Hg at any time.
(2) The discharge of mercury shall be exempt from the limitations of division (B)(1) above if all the following conditions are met:
(a) The total plant discharge is less than one-half pound as Hg in any year;
(b) The discharge is to be a public sewer served by a sewage treatment facility handling no less than 25,000 population equivalents;
(c) The discharge does not alone, or in conjunction with other sources, cause the effluent from the sewage treatment plant to exceed 0.0005 mg/l as Hg; and
(d) At least 95% of the mercury that would be discharged in the absence of control is removed from the effluent by July 1, 1975.
(e) After July 1, 1975, the exemptions provided in this subdivision (2) shall terminate.
(3) The discharge of wastes from medicinal or therapeutic use of mercury, exclusive of laboratory use, shall be exempt from the limitations of division (B)(1) and (2) of this section if all the following conditions are met:
(a) The total plant discharge is less than one-half pound as Hg in any year;
(b) The discharge is to a public sewer system; and
(c) The discharge does not, alone or in conjunction with other sources, cause the effluent from the sewer system or treatment plant to exceed 0.0005 mg/l of Hg.
(d) No discharge of mercury shall be permitted which, alone or in combination with other sources, causes a violation of the water quality standard of 0.0005 mg/l of Hg.
(C) Cyanide, STORET number — 00720.
(1) No waste discharge to any public sewer system shall contain cyanide in excess of 0.025 mg/l at any time except as permitted by division (C)(2) of this section.
(2) Upon application by a county, municipality, sanitary district, or public utility and approval by the Agency, limited amounts of cyanide or cyanogen compounds may be permitted to be discharged to a county, municipal, sanitary district or public utility's sewer works. Total cyanide shall not exceed 10 mg/l provided any sample tested shall not lease more than 2 mg/l of cyanide when tested at a pH of 4.5 and at a temperature of 150° for a period of 30 minutes. Such discharges shall be permitted only when the Agency has determined that no violation of the effluent criteria of this chapter will result from such discharge.
(Ord. 523, passed 7-1-74) Penalty, see § 51.999