(1) 
No industrial user shall contribute or cause to be contributed into the municipal wastewater system, directly or indirectly, any pollutant or wastewater which will cause interference or pass through. These general prohibitions apply to all industrial users of the municipal wastewater system whether or not the user is subject to categorical pretreatment standards or any other national, state or local pretreatment standards or requirements. Furthermore, no industrial user may contribute the following substances to the system:
(a) 
Any liquids, solids or gases which by reason of their nature or quantity are, or may be, sufficient, either alone or by interaction with other substances, to cause fire or explosion or be injurious in any other way to the municipal wastewater system. Included in this prohibition are wastestreams with a closed cup flashpoint of less than 140 degrees F (60 degrees C). At no time shall two successive readings on an explosion hazard meter at the point of discharge into the system or at any point in the system be more than five percent nor any single reading over 10 percent of the lower explosive limit (LEL) of the meter.
(b) 
Solid or viscous substances in amounts which will cause interference with the flow in a sewer but in no case solids greater than one-half inch (1.27 centimeters) in any dimension.
(c) 
Any fats or greases, including but not limited to petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through.
(d) 
Any wastewater having a pH less than 5.0, or otherwise causing corrosive structural damage to the system, city personnel or equipment.
(e) 
Any wastewater containing pollutants in sufficient quantity (flow or concentration), either singly or by interaction with other pollutants, to pass through or interfere with the municipal wastewater system, any wastewater treatment or sludge process, or constitute a hazard to humans or animals.
(f) 
Any noxious or malodorous liquids, gases, or solids or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for maintenance and repair.
(g) 
Any substance which may cause the treatment plant effluent or any other residues, sludges, or scums to be unsuitable for reclamation and reuse or to interfere with the reclamation process. In no case shall a substance discharged to the system cause the city to be in noncompliance with sludge use or disposal regulations or permits issued under Section 405 of the Act: the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act, or other state requirements applicable to the sludge use and disposal practices being used by the city.
(h) 
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 effluent thereby violating the city's NPDES permit. Color (in combination with turbidity) shall not cause the treatment plant effluent to reduce the depth of the compensation points for photosynthetic activity by more than 10 percent from the seasonably established norm for aquatic life.
(i) 
Any wastewater 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 degrees F (40 degrees C).
(j) 
Any wastewater containing any radioactive wastes or isotopes except as specifically approved by the director in compliance with applicable state or federal regulations.
(k) 
Any pollutants which result in the presence of toxic gases, vapors or fumes within the system in a quantity that may cause worker health and safety problems.
(l) 
Any trucked or hauled pollutants, except at discharge points designated by the city in accordance with SCC § 13.55.160.
(m) 
Stormwater, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, cooling water and unpolluted industrial wastewater, unless specifically authorized by the superintendent.
(n) 
Any industrial wastes containing floatable fats, waxes, grease or oils, or which become floatable at the wastewater temperature at the introduction to the treatment plant during the winter season; but in no case, industrial wastewater containing more than 100 mg/l of emulsified oil or grease.
(o) 
Nonbiodegradable cutting oils, commonly called soluble oils, which form a persistent water emulsion, and nonbiodegradable complex carbon compounds.
(p) 
Any sludges, screenings, or other residues from the pretreatment of industrial wastes.
(q) 
Any medical wastes, except as specifically authorized by the director in a wastewater permit.
(r) 
Any material containing ammonia, ammonia salts, or other chelating agents which will produce metallic complexes that interfere with the municipal wastewater system.
(s) 
Any material identified as hazardous waste according to 40 CFR Part 261 except as may be specifically authorized by the director.
(t) 
Any wastewater causing the treatment plant effluent to show a lethal concentration (LC) of 50 percent as determined by a toxicity test of 96 hours or less, using a percentage of the discharge and aquatic test species chosen by the director.
(u) 
Recognizable portions of the human or animal anatomy.
(v) 
Any wastes containing substances which cause excessive foaming in the municipal wastewater system.
(2) 
Wastes prohibited by this section shall not be processed or stored in such a manner that these wastes could be discharged to the municipal wastewater system. The director may require that floor drains located in process or storage areas discharge into the user's pretreatment facility before connecting to the city system.
(Code 1985 § 22-71A)
The following pollutant limits are established to protect against pass through and interference. No person shall discharge wastewater containing in excess of the following instantaneous maximum allowable discharge limits based on 24-hour composite samples:
1.93
mg/l
arsenic
0.15
mg/l
cadmium
2.88
mg/l
chromium
2.72
mg/l
copper
1.66
mg/l
cyanide
1.06
mg/l
lead
0.02
mg/l
mercury
0.81
mg/l
nickel
3.64
mg/l
silver
2.32
mg/l
zinc
Concentrations apply at the point where the industrial waste is discharged to the municipal wastewater system. All concentrations for metallic substances are for "total recoverable" metal. At his discretion, the director may impose mass limitations in addition to or in place of the concentration- based limitations above.
(Code 1985 § 22-71(C); Ord. 3-27-03)
The city reserves the right to establish, by ordinance or in wastewater permits, more stringent limitations or requirements on discharges to the municipal wastewater system if deemed necessary to comply with the objectives presented in SCC § 13.55.010 or the general and specific prohibitions in SCC § 13.55.060.
(Code 1985 § 22-71D)
The city reserves the right to enter into special agreements with users setting out special terms under which the industrial user may discharge to the system. In no case will a special agreement waive compliance with a pretreatment standard. However, the industrial user may request a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15. Industrial users may also request a variance from the categorical pretreatment standard from U.S. EPA. Such a request will be approved only if the user can prove that factors relating to its discharge are fundamentally different from the factors considered by U.S. EPA when establishing that pretreatment standard. An industrial user requesting a fundamentally different factor variance must comply with the procedural and substantive provisions in 40 CFR 403.13.
(Code 1985 § 22-71E)
No 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 in any other pollutant-specific limitation developed by the city.
(Code 1985 § 22-71F)