§ 50.119  PROHIBITED DISCHARGE STANDARDS.
   (A)   Discharge
      (1)   No sewer connection shall be allowed upstream of a combined sewer overflow if the flow discharge strength is tested and proved to be greater than domestic strength sewage.
      (2)   No person shall discharge or cause to be discharged any stormwater, foundation drain water, groundwater, roof runoff, surface drainage, cooling waters, or any other unpolluted water to any sanitary sewer. No person shall take any action that will increase the quantity of these waters discharged to the existing combined sewer system.
   (B)   Storm water.
      (1)   Within six months of a storm water sewer becoming available, any connection of inflow of storm water to a combination sewer shall be removed and connected to the storm sewer.
      (2)   Storm water and all other unpolluted drainage shall be discharged to such sewers specifically designated as storm sewers or to a natural outlet. Connections to storm sewers, the discharge of unpolluted cooling waters, or unpolluted process waters to storm sewers may only be done with an approved NPDES Permit and a permit from the city.
   (C)   Prohibited discharges.  No user shall contribute or cause to be contributed, directly or indirectly, any pollutant or wastewater which will interfere with the operation or performance of the POTW or pass through the POTW. The following general prohibitions shall apply to all users of the city's POTW whether or not a user is subject to national categorical pretreatment standards or any other national, state or local pretreatment standards or requirements. A user may not contribute the following substances to the city's POTW:
      (1)   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 or hazardous in any way to the POTW or to the operation of the POTW. This prohibition includes, but is not limited to waste streams with a closed cup flashpoint of less than 140 degrees Fahrenheit or 60 degrees Centigrade using the test methods specified in 40 CFR Section 261.21. At no time, shall two successive readings on a meter capable of reading L.E.L. (lower explosive limit) at a point at the nearest accessible point to the POTW in a sanitary sewer, at the point of discharge into the POTW, or at any point in the POTW be more than 5% nor any single reading greater than 10%. Materials in this subsection include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, keotones, aldehydes, peroxides, chlorates, perchlorates, bromates, polychlorinated biphenyls, poly brominated biphenyls, carbides, hydrides, standards solvents, and sulfides.
      (2)   Solid or viscous substances which may cause obstruction to the flow in a sewer or other interference with the operation of the wastewater treatment facilities such as, but not limited to: grease, garbage with particles greater than one-half inch in any dimension, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastics, tar, asphalt residues from refining or processing of fuel or lubricating oil, mud or glass grinding or polishing wastes, or tumbling and de-burring stones.
      (3)   Any waters or wastes having a pH lower than 6.0 or higher than 10.0 or having any other corrosive property capable of causing damage or hazard to sewer, structures, equipment and personnel of the sewage works.
      (4)   Any wastewater containing pollutants 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 will constitute a hazard to humans or animals.
      (5)   Any pollutant which results in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that may cause acute worker health and safety problems.
      (6)   In no case shall a substance discharged to the POTW cause the POTW to be in noncompliance with sludge use or disposal criteria, guidelines or regulations affecting sludge use or disposal developed pursuant to the RCRA, S WDA, the Clean Water Act, the Toxic Substances Control Act, or state criteria applicable to the sludge management method being used.
      (7)   Any substance which will cause the POTW to violate its NPDES permit or the receiving water quality standards.
      (8)   Any wastewater having a temperature at the point of discharge to the POTW which will inhibit biological activity in the POTW treatment plant resulting in interference; in no case shall wastewater be introduced to the POTW which exceeds 40 degrees C. (104 degrees F.) at the POTW treatment plant.
      (9)   Any pollutants, including compatible pollutants, released at a flow or pollutant concentration that will cause interference with the POTW. In no case shall a slug measured at the point of discharge to the POTW have a flow rate or contain concentrations of pollutants that exceed, more than three times the average 24-hour concentrations, or 24-hour flow during normal operation.
      (10)   Any wastewater containing any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by state or federal regulations.
      (11)   Any wastewater which may contain more than 100 mg/1 concentration of fat, oil, grease (FOG). Any petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass through.
      (12)   Any wastewater containing BOD, total solids, or suspended solids of such character and quantity that unusual attention or expense is required to handle such materials at the sewage treatment plant; provided however, that a user may be permitted by specific, written agreement with the city, which agreement to discharge such BOD or TSS may provide for special charges, payments or provisions for treating and testing equipment.
      (13)   Any discharge exceeding the standards established in 35 Ill. Adm. Code 307 from time to time.
      (14)   Any wastewater containing a toxic pollutant that may cause interference with any wastewater treatment process, constitutes a hazard to humans or animals, contaminate the sludge or pass through the POTW and pollute the waters of the state. Any wastewater causing the treatment plant's effluent to fail a toxicity test.
      (15)   Any trucked or hauled pollutants, except at discharge points designated by the city.
   (D)   Federal categorical pretreatment standards. The national categorical pretreatment standards found at 40 CFR Chapter I, Subchapter N, Section 405-471 are hereby incorporated.
   (E)   Specific pollutant limitations.  Discharges from each separate discharge of a user shall not contain in excess of the following concentrations based upon a 24-hour composite sample. Multiple industrial wastewater discharges from a permitted facility exclusive of domestic and cooling waters may be combined in a flow-weighted manner to determine compliance with the following limitations for a 24-hour composite sample unless indicated as grab samples.
CONCENTRATIONS
Pollutant
(mg/l)
Arsenic (total)
0.10
Ammonia Nitrogen
100.0
Barium (total)
5.0
Cadmium (total)
0.05
Chromium (total)
1.70
Copper (total
1.20
Cyanide (total) (grab)
0.15
Fluoride (total)
15.0
Iron (total)
10.0
Lead (total)
1.50
Manganese (total)
1.0
Mercury
0.0005
Molybdenum
0.2
Nickel (total)
1.47
Phenols (grab)
2.0
Selenium (total)
1.0
Silver
5.0
Zinc (total)
1.30
   (F)   Additional limitations. The city reserves the right to establish by ordinance, in the city's wastewater discharge permits, more stringent limitations or requirements on discharges to the POTW if deemed necessary to comply with the objectives and the general and specific prohibitions of this subchapter.
   (G)   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. However, the industrial user may request a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15. They may also request a variance from the categorical pretreatment standard from EPA. Such a request will be approved only if the industrial user can prove that factors relating to its discharge are fundamentally different from the factors considered by 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 Section 403.13.
   (H)   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. The Chief Operator may impose mass limitations on industrial users that are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.
(Ord. 99-4993, passed 7-20-1999; Am. Ord. 2003-5165, passed 8-5-2003; Am. Ord. 2004-5178, passed 4-6-04; Am. Ord. 2006-5218, passed 8-15-2006)