Except as otherwise provided, no person shall discharge or cause to be discharged any of the following waters or wastes to any public sewers:
(a) Any liquid or vapor having a temperature higher than 150° Fahrenheit (65° Centigrade).
(b) Any water or waste which contains grease or oil or other substance that will solidify or become discernibly viscous at temperatures between 32° and 150° Fahrenheit.
(c) Any water or waste containing fat, emulsified oil or grease exceeding on analysis an average of 50 parts per million (416 pounds per million gallons) of either soluble matter.
(d) Any gasoline, benzene, naphtha, fuel oil, mineral oil or other flammable or explosive liquid, solid or gas.
(e) Any water or waste that contains more than ten parts per million by weight of the following gases: hydrogen sulphide, sulphur dioxide or nitrous oxide.
(f) Any garbage that has not been properly shredded.
(g) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rugs, feathers, tar, plastics, wood, paunch, manure, hair and fleshings, entrails, lime slurry, lime residues, beer or distillery slops, chemical residues, paint residues, cannery waste bulk solids, or any other solid or viscous substance capable of causing obstruction to the flow in sewers or other interference with the proper operation of the sewage works.
(h) Any water or waste that contains phenols in excess of 0.50 parts per million by weight.
(i) Any waters or wastes having a pH lower than 5.5 or higher than 9.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the sewage works.
(j) Any waters or wastes containing a toxic or poisonous substance in sufficient quantity to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals or create any hazard in the receiving waters of the sewage treatment plant.
(k) Any waters or wastes containing suspended solids of such character and quantity that unusual attention or expense is required to handle such materials at the sewage treatment plant. Materials such as copper, zinc, chromium and similar toxic substances shall be limited to the following average quantities in the sewage as it passes through the control manhole and at no time shall the hourly concentration at the control manhole exceed three times the average concentration:
Toxic Substances | Parts per Million |
Iron as Fe | 5.0 |
Chromium as Cr total | 3.0 |
Copper as Cu | 1.0 |
Zinc as Zn | 2.0 |
Nickel | 3.0 |
The foregoing quantities of permissible toxic materials may be reduced by the superintendent of service, if, in his judgment, reduction is necessary to the proper operation of the sewage treatment plant.
(l) Any water or waste containing cyanides in excess of one part per million by weight as CN.
(m) Any noxious or malodorous gas or substance capable of creating a public nuisance.
(Ord. 73-90. Passed 6-18-73.)