§ 86-44. Specific discharge limitations.

(a)

No person shall discharge or cause to be discharged, the following described substances, materials, water or wastes if it is determined by the water and sewerage department that such wastes can harm either the sewers, sewage treatment process, or equipment, have an adverse effect on the receiving stream, or can otherwise endanger life, limb, public property, or constitute a nuisance. In making such determination, the water and sewerage department will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the sewers and other pertinent factors. The following substances listed in subsection (a)(1)—(11) of this section shall not be discharged into any public sewer without a written permit from the water and sewerage department:

(1)

Liquid or vapor having a temperature higher than 150 degrees Fahrenheit (65 degrees Celsius);

(2)

Water or waste containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32 and 150 degrees Fahrenheit (0 and 65 degrees Celsius);

(3)

Garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths horsepower (1.76 hp metric) or greater shall be subject to the review and approval of the water and sewerage department;

(4)

Waters or wastes containing strong acid iron pickling wastes, or concentrated plating solutions whether neutralized or not;

(5)

Waters or wastes containing iron, chromium, copper, zinc, and similar objectionable or toxic substances, or wastes found by the water and sewage department to exert an excessive chlorine requirement, to such degree than any such material received in the composite sewage at the sewage treatment works exceeds the limits established by the water and sewerage department for such materials, provided that in no event shall the following limits be exceeded:

Fixed Upper Limits for Constituents (Parts per Million by Weight)

Cadmium	5.0
Chromium	3.0
Copper	3.0
Cyanide	0.0
Nickel	0.1
Silver	5.0
Tin	5.0
Zinc	3.0
Phenol	0.5

 

(6)

Waters or wastes containing phenols or other taste or odor producing substances, in such concentrations exceeding limits which may be established by the water and sewerage department, state, federal, or other public agencies or jurisdictions;

(7)

Noxious or malodorous gas or substance, capable of creating a public nuisance, or hazard to life, or preventing entry into sewers for their maintenance, inspection, and repair;

(8)

Waters containing quantities of radium, naturally occurring, or artificially produced radioisotopes, in excess of presently existing or subsequently accepted limits for drinking water as established by the National Committee on Radiation Protection and Measuring;

(9)

Waters or wastes having a pH in excess of 8.5;

(10)

Materials which exert or cause:

a.

Unusual concentrations of inert suspended solids (such as, but not limited to, Fullers earth, lime slurries, and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate);

b.

Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions); or

c.

Unusual BOD, chemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works; and

(11)

Waters or wastes containing substances which are not amenable to treatment processes employed, or are amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over the discharge to the receiving waters.

(b)

The admission into the public sewers of any waters or wastes having a five-day biochemical oxygen demand in excess of 300 parts per million by weight on a 24-hour composite basis, or having a BOD solids content for any sample period greater than five times the average influent value recorded at the affected sewage treatment plant during the previous calendar year, will be subject to review by the water and sewerage department. Where necessary in the opinion of the water and sewerage department, the owner shall provide and operate, at his own expense, such pretreatment as may be required to reduce the biochemical oxygen demand, pH, total solids, discoloration, toxic metals, etc., to meet the above requirements.

(c)

The admission into the public sewers of any waters or wastes having a suspended solids content in excess of 350 parts per million by weight on a 24-hour composite basis or having a suspended solids content for any sample period greater than five times the average influent value recorded at the affected sewage treatment plant during the previous calendar year, will be subject to review by the water and sewerage department.

(Res. No. 98-3, § 3-2.2, 3-10-1998)