§ 50.088 WASTEWATER; LOCAL LIMITS.

   (A)   To implement the general and specific discharge prohibitions listed in this chapter, industrial user-specific local limits will be developed to ensure that the POTW’s maximum allowable headworks loading is not exceeded for particular pollutants of concern for each industrial user.

   (B)   Unless authorized by a permit issued pursuant to §§ 50.105 through 50.112 of this code, no person shall discharge wastewater containing pollutants at levels which exceed the levels associated with domestic sewage.

      (1)   For the following parameters, exceeding domestic sewage levels shall mean in excess of the following levels:

Pollutant	Maximum Domestic Sewage Level
Arsenic	0.003 mg/l
BOD	250 mg/l
Cadmium	0.003 mg/l
Total chromium	0.05 mg/l
Copper	0.061 mg/l
Cyanide	0.041 mg/l
Lead	0.049 mg/l
Mercury	0.0003 mg/l
Nickel	0.021 mg/l
Silver	0.005 mg/l
TKN	40 mg/l
TSS	250 mg/l
Zinc	0.175 mg/l

 

      (2)   Domestic sewage levels for pollutants not listed in the table above shall be determined by the POTW Director and shall be based on either actually measured local domestic sewage levels or levels generally accepted as reasonable in the scientific community.

      (3)   Industrial user-specific local limits for appropriate pollutants of concern shall be included in wastewater permits and are considered pretreatment standards. The POTW Director may impose mass limits in addition to, or in place of, the concentration-based limits in the table above.

      (4)   State requirements and limitations on discharges shall apply in any case where they are more stringent than federal requirements and limitations or those in this chapter.

      (5)   The town reserves the right to establish limitations and requirements for domestic sewage dischargers and commercial users which are more stringent than those required by either state or federal regulation.

   (C)   Unless authorized by a permit issued pursuant to §§ 50.105 through 50.112 of this code, no domestic sewage discharger or commercial user shall discharge wastewater with any of the following characteristics:

      (1)   Having any clothing, rags, textile remnants or the like, except scraps of fibers that will pass through a one quarter inch mesh screen or its equivalent in screening ability;

      (2)   Having a COD of more than 1,500 mg/l;

      (3)   Having an ammonia nitrogen content of more than 40 mg/l;

      (4)   Containing in excess of 0.02 mg/l total identifiable chlorinated hydrocarbons;

      (5)   Containing 1.0 mg/l phenolic compounds which cannot be removed by the town’s treatment process;

      (6)   Containing any toxic or poisonous substances or any other materials (including, but not limited to, heavy metals or chemicals) in sufficient quantities to interfere with the biological processes used in the sewage treatment works or that will pass through the sewage treatment works and harm persons, livestock or aquatic life utilizing the natural outlet;

      (7)   Containing strong iron pickling wastes or concentrated plating solutions unless pretreated in such a way as to comply with all other limitations of this section;

      (8)   Containing any solid or viscous substance, including, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, paper products, glass, rags, bones, feathers, slurry, lime residues, slops, whole blood, fleshings, chemical residues, paint residues, waxes, asphalt, tar, hair, plastics, wood, paunch manure, butcher’s offal or animal viscera capable of causing obstructions to the flow in the sewers or other interference with the proper operation of the sewage collection system or the sewage treatment works;

      (9)   Containing any liquid waste or other substance that contains dyes or other colors of such character and quantity as to prevent removal by biological processes employed at the town’s treatment plant or that requires special chemical treatment;

      (10)   Containing any liquid or other substances that, after normal treatment, require excessive amounts of chlorine for stabilization or pathogenic disinfection. The amount of excess demand will be determined by comparing the chlorine demand of all other wastes entering the plant;

      (11)   Containing any materials that form excessive amounts of scum that may interfere with the operation of the sewage treatment works or cause undue additional labor or chemicals in connection with its operation; or

      (12)   Having any waste resulting from process(es) involving textiles, fabrics, wool or other processes containing inert fibrous materials. These discharges shall undergo evaluation by the town. Since some of these processes have been shown to be detrimental to the treatment of waste, the evaluation procedure will be concerned with residual fiber 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, pond or discharges, shall not be allowed to continue disposing of its waste into the sanitary sewer collection system of the town, but shall dispose of its waste by alternative means.

   (D)   (1)   Users in industrial categories subject to effluent guidelines issued under § 304(b) of the Act which are discharging incompatible pollutants to publicly owned treatment works, are required to adopt the best practicable control technology currently available, as defined by the Administrator pursuant to § 304(b) of the Act. Where the town’s treatment works were designed to and do achieve substantial removal of pollutants other than compatible pollutants, as defined in this chapter, the town may not require the user to achieve best practicable control technology currently available, since this would lead to an uneconomical duplication of treatment facilities.

      (2)   While the term SUBSTANTIAL REMOVAL is not subject to precise definition, it generally contemplates removals on the order of 80% or greater; minor incidental removals on 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 or sanitary sewer system. However, any adjustments required for particular industrial categories should be considered in connection with the town’s requirements, rather than the national pretreatment standard.

   (E)   Limitations on wastewater strength in this chapter may be supplemented with more stringent limitations in accordance with the permit sections of this chapter and regulations, laws and procedures governing reissuance of permits.

(Prior Code, § 50.073) (Ord. O-00-001, passed 2-24-2000) Penalty, see § 50.999