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-CODE OF ORDINANCES <br /> Chapter 78- UTILITIES <br /> ARTICLE III. -SEWERS AND SEWAGE DISPOSAL <br /> DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS <br /> Subdivision III. - Discharge Restrictions <br /> (1) Any wastewater having a temperature higher than 150 degrees Fahrenheit (65 degrees <br /> Celsius), or causing individually, or in combination with other wastewater, the influent at the <br /> wastewater treatment plant to have a temperature exceeding 104 degrees Fahrenheit (40 <br /> degrees Celsius), or having heat in amounts which will inhibit biological activity in the <br /> wastewater treatment works resulting in interference therein. <br /> (2) Any water or waste containing fats, wax, grease or oils, whether emulsified or not, in excess of <br /> 100 milligrams per liter, or containing substances which may solidify or become viscous at <br /> temperatures between 32 and 150 degrees Fahrenheit (zero degrees and 65 degrees Celsius, <br /> respectively), and any wastewater containing oil and grease concentrations of mineral origin of <br /> greater than 100 milligrams per liter, whether emulsified or not. <br /> (3) Any garbage that has not been ground or otherwise reduced to such a degree that all particles <br /> will be carried freely in suspension under flow conditions normally prevailing in public sewers, <br /> with no particles greater than one-half inch in any dimension. <br /> (4) Any water or waste containing strong acid iron pickling wastes, or concentrated plating <br /> solutions, which is not neutralized and does not meet applicable pretreatment standards. If <br /> national categorical pretreatment standards do not apply, the discharge equality shall comply <br /> with 40 CFR part 433 (metal finishing standards). <br /> (5) Any noxious water or wastes containing phenols or other taste- or odor-producing substances <br /> which constitute a nuisance or hazard to the structures, equipment or personnel of the waste <br /> treatment works, or which interfere with treatment required to meet the requirements of the state <br /> and federal government and any other public agency with proper authority to regulate discharge <br /> from the sewage treatment plant. <br /> (6) Radioactive wastes or isotopes of such halflife or concentration that they are in noncompliance <br /> with regulations issued by the appropriate authority having control over their use or which have <br /> caused or may have caused damage or hazard to the treatment works or personnel operating it. <br /> (7) Any water or waste outside the pH range of 5.0 to 10.5. This range will allow adequate flexibility <br /> for industrial users. A higher pH than 8.5 but less than 10.5 will not cause treatment or sewer <br /> compatibility problems and in many cases will allow industrial users to better treat wastewater <br /> containing metals prior to discharge. Potable water supplies often exceed a pH of 8.5. <br /> (8) Any noncontact cooling water or unpolluted stormwater, drainage water or groundwater. <br /> (9) Any waters or wastes containing the following substances: arsenic, cadmium, copper, cyanide, <br /> lead, mercury, nickel, silver, total chromium, zinc or phenolic compounds, to a degree that the <br /> materials received prevent adequate treatment of the waste. <br /> (10) Materials which exert or cause: <br /> a. Unusual concentrations of suspended solids, such as, but not limited to, Fuller's earth, lime <br /> slurry and lime residues, or of dissolved solids, such as, but not limited to, sodium chloride <br /> and sodium sulfate. <br /> b. Excessive discoloration, such as, but not limited to, dye wastes and vegetable tanning <br /> solutions. <br /> c. Unusual BOD, COD or chlorine requirements in such quantities as to constitute a <br /> significant load on the wastewater treatment works. <br /> d. Unusual volumes of flow or concentrations of wastes constituting a slug. <br /> Elk River, Minnesota, Code of Ordinances Page 18 <br />