Sec. 24-45(1). No person shall discharge or cause to be discharged any stormwater runoff, roof runoff, cooling water which has not been concentrated to a factor of 3 or greater, or other unpolluted waters to any sanitary sewer, except as provided for in minor section 24-45(2).
Sec. 24-45(2). Upon the approval of the director or his appointed representative, a permit may be issued to allow discharge of swimming pool drainage, cooling water concentrated by a factor less than 3 or unpolluted process waters where, in the opinion of the director or his appointed representative, other methods of disposal would produce a public nuisance. In no case shall water be discharged upon public property, such as alleys or streets.
Sec. 24-45(3). No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer:
(a) Any solids, liquids or gases which by themselves or by interaction with other substances may cause fire or explosion hazards, or in any other way be injurious to persons, property or the operation of the wastewater system.
(b) Any noxious or malodorous solids, liquids or gases, which, either singly or by interaction with other substances, are capable of interfering with wastewater treatment processes, creating a public nuisance or hazard to life or preventing entry into sewers for their maintenance and repair.
(c) Any ashes, asphalt, dead animals, offal, cinders, sand, mud, straw, shavings, metal, glass, rags, paper towels, feathers, tar, sanitary napkins, plastics, wood, whole blood, paunch manure, bones, hair and fleshings, entrails, paper dishes, paper cups, milk containers, or other similar paper products or any other solids, greases, slurries or viscous materials of such character or in such quantity that, in the opinion of the director, may cause an obstruction to the flow in the sewer or otherwise interfere with the proper function of the wastewater system.
(d) Any waters or wastes containing suspended solids of any character and quantity that unusual attention or expense is required to handle such materials at the wastewater treatment plant.
(e) Any toxic substances, chemical elements, or compounds in quantities sufficient to impair the operation or efficiency of the wastewater treatment facilities, or that will pass through the wastewater treatment plant and cause the effluent thereof to exceed state or federal water quality requirements.
(f) Any liquids having a pH lower than 6.0 or higher than 9.0, or having any corrosive property capable of causing damage or hazards to structures, equipment or personnel of the wastewater system.
(g) Any pumping wastes from grease traps, or grease and/or grit interceptors.
(h) Recognizable portions of the human anatomy.
(i) Any waste that is considered infectious without complete disinfection before discharging into the sanitary sewer.
(j) Any water added for the purpose of diluting wastes which would otherwise exceed applicable maximum concentration limitations.
Sec. 24-45(4). This section limits the concentration of certain incompatible wastes which, when present in excessive quantities, interfere with collection and treatment of wastewater, cause a degradation of the wastewater treatment plant effluent, or increase the operation and maintenance costs of the wastewater system. Whereas, it is desirable to achieve the best possible wastewater treatment, while minimizing the economic impact on wastewater dischargers, the list given below contains concentration guidelines rather than strict limits. These guidelines permit the control of undesirable substances at lower concentrations than would otherwise be allowed by strict limits which would be imposed on all users regardless of the volume of the discharge, or the relative cost of treatment to meet the concentration limit. Except in quantities or concentrations stipulated herein, it shall be unlawful for any person to discharge waters or wastes to the sanitary sewer containing:
(a) Biodegradable oils and greases in a concentration which permits deposits in a sanitary sewer at any point within or downstream of the building connection sewer, or which exceeds a concentration of one hundred (100) milligrams per liter.
(b) Nonbiodegradable cutting oils, commonly called soluble oil, which form persistent water emulsions in concentrations exceeding twenty (20) milligrams per liter.
(c) Nonbiodegradable petroleum oils, mineral oils, refined petroleum products or chlorinated hydrocarbons in concentrations exceeding twenty (20) milligrams per liter.
(d) Radioactive material in concentrations greater than one hundred (100) microcuries per liter.
(e) Any material or concentrations producing an immediate oxygen demand greater than ten (10) milligrams per liter of oxygen.
(f) Any waste producing detectable discoloration of the treatment plant effluent.
(g) Any garbage or waste that is not ground sufficiently to pass through a three- eighths-inch screen.
(h) Any of the ions or compounds in solution or suspension in concentrations exceeding the guidelines listed in the table that follows:
Ion or Compound....
|
Concentration (mg/l)
|
Ion or Compound....
|
Concentration (mg/l)
|
Arsenic....
|
1.5
|
Barium....
|
30.0
|
Cadmium....
|
3.0
|
Chromium....
|
1.5
|
Lead....
|
1.5
|
Mercury....
|
0.06
|
Selenium....
|
0.3
|
Silver....
|
1.5
|
Boron....
|
10
|
Copper....
|
No excessive amounts
|
Iron....
|
No excessive amounts
|
Manganese....
|
30
|
Molybdenum....
|
30
|
Nickel....
|
No excessive amounts
|
Tin....
|
No excessive amounts
|
Zinc....
|
No excessive amounts |
The term "no excessive amounts" indicates that discharges shall be limited through the permit process.
The concentration guideline listed indicates the maximum allowable concentration permitted for discharge to the sanitary sewer without specific pretreatment or specific steps taken to prevent contamination of the wastewater discharge. No discharger shall exceed the concentration given in the table unless specifically allowed by an industrial wastewater discharge permit.
Sec. 24-45(5). Permits to discharge in excess of the guidelines listed in minor section 24-45(4) shall be approved only with the following provisions and stipulations:
(a) The discharger must submit a written statement containing all pertinent facts necessary to show that it is technically or economically impractical to reduce the substance under consideration to the guidelines concentration.
(b) The discharger shall propose measures to reduce the concentration of the substance in question to a specific level.
(c) The discharger must show that at the specified discharge concentration the pollutant in question will not significantly degrade effluent quality, nor will it increase the pollutant's concentration in the treatment plant effluent beyond that permitted by EPA drinking water standards.
(d) The discharger (must agree to pay the unit charge imposed by the utility for the specific substances in violation of the concentration guidelines.
Sec. 24-45(6). In certain instances, the environmental protection agency (EPA) has established pretreatment standards for discharge to municipal sewage systems for specific industrial classes. Where the EPA pretreatment standards are more stringent than those given in the preceding paragraphs, the EPA standards shall apply.
(Ord. No. 4672, § 5, 6-20-77)