(A) In order that the biological treatment process is not subjected to unacceptable levels of toxic wastes and so that the process can function properly to meet state and federal standards, it shall be unlawful for any person to discharge into the town’s wastewater collection system waters (as measured by any sample collected by the town) containing an excess of:
(1) Any of the following elements:
Constituent | Code | Maximum Permissible Concentration |
Constituent | Code | Maximum Permissible Concentration |
Aluminum | Al | 5 mg/l |
Arsenic | As | 0.05 mg/l |
Barium | Ba | 0.5 mg/l |
Boron | B | 0.5 mg/l |
Cadmium | Cd | 0.5 mg/l |
Cobalt | Co | 0.5 mg/l |
Copper | Cu | 0.5 mg/l |
Cyanide | CN | 0.1 mg/l |
Iron | Fe | 35 mg/l |
Lead | Pb | 0.5 mg/l |
Manganese | Mn | 0.5 mg/l |
Mercury | Hg | 0.1 mg/l |
Nickel | Ni | 0.5 mg/l |
Silver | Ag | 0.1 mg/l |
Total Chromium | Cr | 0.5 mg/l |
Vanadium | V | 0.5 mg/l |
Zinc | Zn | 0.5 mg/l |
Chloroform | CHCI3 | 1 mg/l |
Selenium | Se | 0.5 mg/l |
Sulfate | SO4 | 500 mg/l |
Sulfide | S | 2 mg/l |
Free Acidity | - | 0 |
Alkalinity | City may require alkalinity addition up to 7.5 times the NH3-N concentration of the discharge in question | |
(2) Except in cases where one or more of the above constituents are found in the drinking water supply. In those cases, the limits shall be the amounts listed plus the amounts found in drinking water. The amount of constituents in the drinking water supply shall be determined on samples caught at the particular industry during a normal operating day. The sample will be caught within the plant at a well used tap after running the tap a suitable length of time to remove water that has been standing in the lines (15-minute minimum);
(3) Having an ammonia nitrogen content of more than 40 mg/l;
(4) Having a five-day B.O.D. of more than 600 mg/l;
(5) Having a T.S.S. content of more than 500 mg/l;
(6) Having a C.O.D. of more than 1,500 mg/l;
(7) Having a pH lower than 6.5;
(8) Having a pH higher than nine;
(9) Having a temperature higher than 120°F, 49°C;
(10) Containing more than 100 mg/l (total) of oil and grease of animal or vegetable and of mineral or petroleum origin;
(11) Containing in excess of 0.02 mg/l total identifiable chlorinated hydrocarbons;
(12) Containing one mg/l phenolic compounds which cannot be removed by the town’s treatment process;
(13) Containing any toxic substances or poisonous substances in sufficient quantities to interfere with the biological processes used by the town’s treatment works;
(14) Containing strong iron pickling wastes or concentrated plating solutions, unless pretreated in a way so as to comply with all other limitations of § 52.018;
(15) Containing any solid or viscous substance, including, but not being limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, bones, feathers, slurry, lime residues, slops, whole blood, fleshings, chemical residues, paint residues, waxes, asphalt, hair, tar, plastics, wood, paunch manure, butcher’s offal, animal viscera, lime, or any solid or viscous substances capable of causing obstructions of any kind in either the collection system or at any point in the treatment plant. Also, any waste resulting from process(es) involving textiles, fabrics, wood, or other processes containing inert fibrous materials shall undergo evaluation by the town. Since some of these processes have been shown to be detrimental to the treatment of waste at the existing waste plant, the evaluation procedure will be concerned with residual fibre within the treatment plant and its discharges. Any process determined by the town to be creating adverse conditions within the treatment plant by the collection of fibrous or inert materials in its basins, clarifiers, or discharges shall not be allowed to continue disposing of its waste into the sanitary sewer collection system, but shall dispose of its waste by alternative means;
(16) Containing any liquid waste or other substance that contains dyes or other color of a character and quantity as to prevent removal by biological processes employed at the treatment plant;
(17) Containing any liquid or other substances that, after normal treatment, require excessive amounts of chlorine for pathogenic disinfection. This excess chlorine demand exerted by the waste shall be determined by comparing the chlorine demand of the waste to obtain a free residual of 0.5 mg/l to 15 ppm, which shall be considered to be the maximum use rate for domestic waste to obtain the same residual;
(18) Of the industrial variety with a volume that the peak hourly flow exceeds a gallons per day rate of 200% of the total daily flow of the industry. In these cases where a peak hourly flow of more than 200% is discharged, the town may require the discharger to provide holding facilities of sufficient capacity so as to discharge into the collection system at an assigned rate over a specified period of time. Industrial dischargers, which discharge hydraulic volumes equal to or greater than 15% of the treatment works design capacity, may be required to provide flow equalization facilities designed in accordance with the current edition of E.P.A. Process Manual for Upgrading Existing Wastewater Plants; and/or
(19) Of a nature that will cause contamination of the wastes in the collection system, or which may contaminate the treatment plant, or the receiving waters of the state, resulting in injury or harm to persons, livestock, or aquatic life.
(B) Users in industrial categories subject to effluent guidelines issued under § 304(b) of the Federal Act, which are discharging incompatible pollutants to publicly owned treatment works, are required to adopt best practicable control technology currently available, as defined by the administrator pursuant to § 304(b) of the Act. Where the town’s treatment works was designed to and does achieve substantial removal of pollutants, other than the four pollutants listed in the definition for compatible pollutants in § 52.002 (B.O.D., T.S.S., pH, and fecal coliform bacteria), the Director of Water Resources may not require the user to achieve best practicable control technology currently available, since this would lead to an uneconomical duplication of treatment facilities. While the term substantial removal is not subject to precise definition, it generally contemplates removals in the order of 80% or greater; minor incidental removals in the order of 10% to 30% are not considered substantial. For some industrial categories, it may be necessary to define pretreatment guidelines for problems that may arise as a result of the discharge into the town’s treatment works. However, any adjustments required for particular industrial categories should be considered in connection with the town’s requirements, rather than in the national pretreatment standard. And in no case shall any user be allowed to exceed the limits stated in division (A)(1) above. Limitations on wastewater strength in this chapter may be supplemented with more stringent limitations pursuant to § 52.062.
(C) If the town determines that the limitations in this section may not be sufficient to enable the town’s treatment works to comply with water quality standards or effluent limitations specified in the town’s national pollutant discharge elimination system (N.P.D.E.S.) permit, or if National Pretreatment Guidelines issued by E.P.A. in the future exhibit lower values than those values listed in this section, or add a parameter to those values listed in this section, the town may require additional compliances by reissuance of permits outlined in § 52.062.
(1983 Code, § 17-80) (Ord. passed 9-13-1988) Penalty, see § 52.999