§ 86-133. Use of public sewers for the discharge of nondomestic wastes.

(a)

No person shall discharge or cause to be discharged any stormwater, surface water, groundwater, roof runoff, subsurface drainage, cooling water, impounded water or unpolluted industrial process waters to any sanitary sewer, without written permission of the director.

(b)

Reserved.

(c)

Except as hereinafter provided, no person shall discharge or cause to be discharged, any of the following described waters or wastes to any public sewer:

(1)

Any liquid or vapor having a temperature lower than 32 degrees Fahrenheit or higher than 150 degrees Fahrenheit;

(2)

Waters or wastes which may contain more than 100 milligrams per liter, by weight, of fats, oils, or grease;

(3)

Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid, or gas;

(4)

Any ashes, anders, sand, mud, grit, straw, animal wastes, shavings, metal, glass, rags, feathers, tar, plastics, wood, manure, or any other solid or viscous substance capable of causing obstruction of the flow in sewers or other interference with the proper operation of the sewage works in the opinion of the director;

(5)

Any waters or wastes having a pH lower than 6.0 or higher than 9.0, or any other hazard to structures, equipment or of the sewage works, in the opinion of the director;

(6)

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 in the opinion of the director;

(7)

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;

(8)

Any noxious or malodorous gas or substance;

(9)

Any waters or wastes containing strong acid, pickling wastes, or concentrated plating solutions whether neutralized or not; or

(10)

Any water or wastes containing excessive concentrations of specific ions as follows:

Element	Maximum Limit (in mg/l)
Aluminum	5.0
Arsenic	0.05
Beryllium	0.10
Boron	0.75
Cadmium	0.010
Chromium	0.05
Cobalt	0.050
Copper	0.20
Fluoride	1.6
Iron	5.0
Lead	0.05
Lithium	2.5
Manganese	0.20
Mercury	0.002
Molybdenum	0.010
Nickel	0.20
Selenium	0.01
Silver	0.05
Zinc	0.5

 

* No data are available for tin, titanium or tungsten.

* The maximum limits are as recommended by the U.S. Environmental Protection Agency and are subject to change from time to time by the U.S. EPA and/or the State of Georgia Department of Natural Resources.

(d)

Grease, oil, and sand traps shall be provided when, in the opinion of the director, they are necessary for the proper handling of wastes containing grease in excessive amounts, or any flammable wastes, sand, grit and other harmful ingredients. All traps shall have a minimum capacity of 1,500 gallons and shall be of an approved type by the department, and shall be constructed outside of building and located so as to be readily and easily accessible for cleaning and inspection. Grease and oil traps shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, watertight, and equipped with easily removable covers which when bolted in place shall be gastight and watertight. Grease and oil traps shall be constructed in any place or building having a capacity to serve group meals.

(e)

Where installed, all grease, oil, sand and grit traps shall be maintained by the owner at his expense in order to provide efficient operation at all times. The department will inspect at it's discretion any and all grease traps. When a grease trap is found to be improperly maintained, the owner of the property will be notified in writing and shall have five business days to correct noted deficiencies. Failure to correct noted deficiencies within the allotted time period may result in a discontinuance of water and/or sewer service where applicable. Where discontinuance of service is inapplicable, violators shall be subject to the penalties as described in section 86-164.

(f)

The admission into the public sewers of any waters or wastes having (1) a five-day biochemical oxygen demand greater than 300 milligrams per liter by weight, or (2) containing more than 350 milligrams per liter by weight of suspended solids, or (3) containing any quantity of substances having the characteristics described in subsection (c) of this section, or (4) having an average daily flow greater than two percent of the average daily sewage flow of the sewer system, shall be subject to the review and approval of the director. Where necessary in the opinion of the director, the owner shall provide, at his expense, such preliminary treatment as may be necessary to:

(1)

Reduce the biochemical oxygen demand to 300 milligrams per liter and the suspended solids to 350 milligrams per liter by weight, or

(2)

Reduce objectionable characteristics of constituents to within the maximum limits provided for in this section, or

(3)

Control the quantities and rates of discharge of such waters or wastes. Plans, specifications, and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the commission together with a letter from the director approving the proposed preliminary treatment facilities, and no construction of such facilities shall be commenced until said approvals are obtained in writing.

(g)

Where preliminary treatment facilities are required for any waters or waste no permit will be granted until such pretreatment units have been placed in operation and have demonstrated their effectiveness by test. The cost of such testing, sampling and analyzing shall be borne by the waste contributor. Said preliminary treatment facilities shall be maintained continuously and satisfactorily in effective operation by the owner at his expense.

(h)

When required by the director, the owner of any property served by a building sewer carrying commercial-industrial wastes shall install a suitable control manhole in the building sewer to facilitate observation, sampling and measurement of the wastes. Such manhole, when required shall be conveniently and safely located. It is to be constructed in accordance with plans approved by the director. The manhole shall be installed by the owner at his expense and shall be maintained by him so as to be safe and accessible at all times.

(i)

All measurements, tests, and analyses of the characteristics of waters and wastes to which reference is made in subsections (c) and (f) shall be determined in accordance with "Standard Methods for the Examination of Water and Sewerage" or with methods approved by the city engineer and may be determined at the control manhole provided for in subsection (h), or upon suitable samples taken at said manhole. In the event that no special manhole has been required, the control manhole may be considered to be the nearest downstream manhole in the public sewer to the point at which the building sewer is connected. If, in the judgment of the director, analyses must be performed which are beyond the scope of the laboratory at the sewage treatment plant, these analyses shall be performed at a laboratory designated by the director and the cost of these analyses shall be borne by the owner.

(j)

No statement contained in this section shall be constructed as preventing any special agreement or arrangement between the city and any industrial, commercial or other owner from whose premises an industrial-commercial or domestic waste emanates which is of unusual strength or character from being accepted by the department for treatment subject to approval by applicable state and federal agencies and to payment therefore by such owner.

(k)

Wastewater from any building sewer entering a public sewer, which is either domestic or nondomestic in nature but having a concentration of a given wastewater constituent higher than the defined normal standard, shall cause the user to be subject to a surcharge based on the following formula:

Cs = [Bc (B) + Sc (S) + Pc (P)]Vu

Where:

Cs	=	A surcharge for wastewaters of excessive strength
Bc	=	Operation and maintenance (O & M) cost for treatment of a unit of biochemical oxygen demand (BOD) $19,682/175,036 lbs./yr. $0.112/lb.
B	=	Concentration of BOD from a user above a base level of 300 mg/l (in pounds per 1,000 gallons)
Sc	=	O & M cost for treatment of a unit of suspended solids (SS) $6,356/129,374 lbs./yr. $0.049/lb.
S	=	Concentration of SS from a user above a base level of 350 mg/l (in pounds per 1,000 gallons)
Pc	=	O & M cost for treatment of a unit of any pollutant (in dollars/lb.)
P	=	Concentration of any pollutant from a user above a base level. The base level shall be determined by the average discharge of thepollutants by residential users.
Vu	=	Volume contributed by a user per unit of time (in 1,000 gallons per month).

 

Therefore:

Cs = [$0.112/lb. (B) + $0.049/lb. (S) + Pc (P)] Vu

The department shall take 24-hour proportional composite samples of a user's sewage discharge to determine concentration levels of B, S and P and to determine a pattern of surcharges. Thereafter, the department may periodically take additional samples for the purpose of adjusting the surcharges. The user may request additional sampling and testing and obtain same provided the user bears the expense.

(Ord. No. 0-11-01, art. V, 4-19-01)