§ 13.12.060. Prohibited discharges.

A.

No person shall discharge, or cause to be discharged, into any public sewer any of the following described substances, materials, waters or wastes:

1.

Any liquid or vapor having a temperature higher than one hundred fifty (150) degrees Fahrenheit (sixty-five (65) degrees Celsius).

2.

Any water or wastes which contain wax, grease or oil plastic, or other substance that will solidify or become discernibly viscous at temperatures between sixty (60) degrees to ninety (90) degrees Fahrenheit.

3.

Flammable or explosive liquid "solid or gas" such as gasoline, kerosene, benzine, naphtha, etc.

4.

Solid or viscous substances in quantities capable of causing obstruction to the flow in sewers, or other interference with the proper operation of the sewage works such as ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, whole blood, paunch manure, hair and fleshings, entrails, lime slurry, lime residue, slops, chemical residues, paint residues, fiberglass, or bulk.

5.

Any garbage that has not been properly comminuted or shredded.

6.

Any noxious or malodorous substance and which can form a gas, which either singly or by interaction with other wastes, is capable of causing objectionable odors, or hazard to life; or which forms solids in concentrations exceeding limits established herein or creates any other condition deleterious to structures or treatment processes; or requires unusual provisions, attention or expense to handle such materials.

B.

Except in quantities, or concentrations, or with provisions as stipulated herein, it is unlawful for any person to discharge waters or wastes to the sanitary sewer containing:

1.

Free or emulsified oil and grease exceeding on analysis an average of one hundred (100) milligrams per liter (eight hundred thirty-three (833) pounds per million gallons) of either or both or combinations of free or emulsified oil and grease, if, in the opinion of the approving authority, it appears probable that such wastes:

a.

Can deposit grease or oil in the sewer lines in such a manner as to clog the sewers;

b.

Can overload skimming and grease handling equipment;

c.

Are not amenable to biological oxidation and will therefore pass to the receiving waters without being affected by normal sewage treatment processes;

d.

Can have deleterious effects on the treatment process due to the excessive quantities.

2.

Acids or alkalies which attack or corrode sewers or sewage disposal structures or have a ph value lower than 5.5 or higher than 10.5.

3.

Salts of heavy metals, in solution or suspensions, in concentrations exceeding the following:

	Milligrams per liter
Arsenic	0.05
Barium	5.0
Boron	1.0
Cadmium	0.02
Chromium, trivalent	5.0
Chromium, hexavalent	5.0
Copper	1.0
Lead	0.10
Magnesium	1.0
Mercury	0.005
Nickel	1.0
Selenium	0.02
Silver	0.10
Zinc	5.00

 

4.

Cyanides or cynogen compounds capable of liberating hydrocyanic gas on acidification in excess of two milligrams per liter by weight as CN in the wastes from any outlet into the public sewers.

5.

Radioactive materials at levels exceeding standards of the State Department of Health.

6.

Materials which exert or cause:

a.

Unusual concentrations of solids or composition: as for example in total suspended solids of inert nature (such as Fuller's Earth) and/or in total dissolved solids (such as sodium chloride, or sodium sulfate);

b.

Excessive discoloration;

c.

Unusual biochemical oxygen demand or an immediate oxygen demand;

d.

High hydrogen sulfide content; or

e.

Unusual flow and concentration, shall be pretreated to a concentration acceptable to the city, if such wastes can cause damage to collection facilities, impair the processes, incur treatment cost exceeding those of normal sewage, or render the water unfit for stream disposal or industrial use. Where discharge of such wastes to the sanitary sewer are not properly pretreated or otherwise corrected, the approving authority may reject the wastes and terminate the service to sanitary sewer, require control of the quantities and rate of discharge of such wastes, or require payment of surcharges for excessive cost of treatment provided such wastes are amenable to treatment by existing sewage plant facilities.

7.

All other heavy metals and toxic materials not specifically set out herein.

(Prior code § 25-41)