(A) Prohibited discharge standards. No industrial user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass through or interference. These general prohibitions apply to all industrial users of the POTW whether or not they are subject to categorical pretreatment standards or any other national, state or local pretreatment standards or requirement. Furthermore, no industrial user shall contribute the following substances to the POTW:
(1) Pollutants which create a fire or explosive hazard in the Municipal wastewater collection and POTW, including but not limited to waste streams with a closed-cup flashpoint of less than 140°F or 60°C using the test methods specified in 40 C.F.R. § 261.21;
(2) Any wastewater having a pH less than 5.0 or more than 9.5, or otherwise causing corrosive structural damage to the POTW or equipment, or endangering city personnel;
(3) Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference;
(4) Any wastewater containing pollutants, including oxygen demanding pollutants (BOD and the like), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with either the POTW; or any wastewater treatment or sludge process, or which will constitute a hazard to humans or animals;
(5) Any wastewater having a temperature greater than 150°F or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104°F or 40°Ce;
(6) Petroleum oil, non-biodegradable cutting oil or products of mineral oil origin, in amounts that will cause interference or pass through;
(7) Any pollutants which result in the presence of toxic gases, vapors or fumes within the POTW in a quantity that may cause acute worker health and safety problems;
(8) Any trucked or hauled pollutants, except at discharge points designated by the city;
(9) Any noxious or malodorous liquids, gases, solids or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance, a hazard to life or to prevent entry into the sewers for maintenance and repair;
(10) Any wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant’s effluent thereby violating the city’s NPDES’s permit;
(11) Any wastewater containing any radioactive wastes or isotopes, except as specifically approved by the Superintendent in compliance with applicable state or federal regulations;
(12) Storm water, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, non-contact cooling water and unpolluted industrial wastewater, unless specifically authorized by the Superintendent;
(13) Any sludges, screenings or other residues from the pretreatment of industrial wastes;
(14) Any medical wastes, except as specifically authorized by the Superintendent;
(15) Any wastewater containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed and causes the treatment plant effluent to violate the city’s NPDES permit or causes the treatment plant effluent to fail a toxicity test;
(16) Any wastes containing detergents, surface active agents or other substances which may cause excessive foaming in the POTW;
(17) Any water or waste containing fats, wax, grease or oils, whether emulsified or not in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F;
(18) Any wastes which cause unusual concentrations of inert suspended solids or inert dissolved solids;
(19) Any unusual volume of flow or concentration of wastes constituting a “slug load”, as defined herein;
(20) Any water or waste waters not in compliance with national categorical pretreatment standards as defined in § 8-2-1 of this chapter; and
(21) Wastes prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW. All floor drains located in process or materials storage areas must discharge to the industrial user’s pretreatment facility before connecting with the POTW.
(B) Influent limits. The maximum influent limits shall not exceed those limits as established in the pretreatment program manual at Table 8, page 18, as adopted by the City Council.
(C) Dilution. No industrial user shall ever increase the use of process water, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limitation unless expressly authorized by an applicable pretreatment standard or requirement.
(D) Special agreement. The city reserves the right to enter into special agreements with industrial users setting out special terms under which they may discharge to the POTW. In no case will a special agreement waive compliance with a pretreatment standard or requirement.
(E) City’s right of revision. The city reserves the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the POTW if deemed necessary to comply with the objectives of this chapter or the general and specific prohibitions in this chapter. The Superintendent shall have the authority to develop local limits based on the maximum allowable headworks loadings (MAHL) and the authority to apply these limits in industrial user discharge permits.
(Ord. C-172, passed 9-7-1993)