(A) Infiltration into sanitary sewer.
(1) No person(s) shall discharge or cause to be discharged any storm water, surface water, groundwater, roof runoff and subsurface drainage or foundation drainage, into any sewer that is connected directly or indirectly to a public sewer main.
(2) Unpolluted industrial cooling water or process waters may be discharged, on approval of the City Public Works Engineer, to a storm sewer, combined sewer, sanitary sewer or natural outlet
(B) Prohibited and limited wastes.
(1) No person(s) shall discharge or cause to be discharged any of the following described water or wastes to any public sewers:
(a) Any gasoline, benzene, naphtha, fuel oil or other combustible, flammable or explosive liquid, solid or gas;
(b) Any water containing toxic or poisonous solids, liquids or gases in sufficient quantity, either singly or by interaction with other wastes, to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the wastewater treatment plant;
(c) Any waters or wastes having a pH lower than (5.5), or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the wastewater works; or
(d) Solid or viscous substances in quantities or of such size capable of causing obstruction to the flow in sewers, or other interference with the proper operation of the wastewater facilities such as, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, cloth or paper towels, impervious, rubber latex gloves, baby wipes or personal hygiene wipes, disposable diapers, feathers, tar, plastics, wood, garbage, whole blood, paunch manure, hair or fleshings, entrails, paper dishes, cups, milk containers and the like.
(2) The following described substances, materials, waters or waste shall be limited in discharges to municipal systems to concentrations or quantities which will not harm either the sewers, wastewater treatment process or equipment, will not have an adverse effect on the receiving stream, or will not otherwise endanger lives, limbs, public property or constitute a nuisance. The City Public Works Engineer may set limitations lower than the limitations established in the regulations below if in his or her opinion such more severe limitations are necessary to meet the above objectives. In forming the opinion as to the acceptability, the City Public Works Engineer will give consideration to such factors as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment plant, and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer which shall not be violated without approval of the City Public Works Engineer are as follows:
(a) Wastewater having a temperature higher than 150°F (65°C);
(b) Wastewater containing more than 25 milligrams per liter of petroleum oil, nonbiodegradable cutting oils or product of mineral origin;
(c) Wastewater from industrial plants containing floatable oils, fat or grease;
(d) Any garbage that has not been properly shredded. Garbage grinders may be connected to sanitary sewers from homes, hotels, institutions, restaurants, hospitals, catering establishments or similar places where garbage originates from the preparation of food in kitchens for the purpose of consumption on the premises or when served by caterers;
(e) Any waters or wastes containing iron, chromium, copper, zinc and similar objectionable or toxic substances to such degree that any such material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the City Public Works Engineer for such materials;
(f) Any waters or wastes containing odor producing substances exceeding limits which may be established by the City Public Works Engineer;
(g) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the City Public Works Engineer in compliance with applicable state or federal regulations;
(h) Quantities of flow, concentrations or both which constitute a “slug” as defined herein;
(i) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or are amenable to treatment only to such degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters; or
(j) Any water or wastes which, by interaction with other water or wastes in the public sewer system, release obnoxious gases, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.
(C) Violations.
(1) Waters or wastes that are discharged, or are proposed to be discharged to the public sewers, which contain any of the substances or possess the characteristics enumerated in division (B) above, and which in the judgment of the City Public Works Engineer, may have a deleterious effect upon the wastewater facilities, processes, equipment or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the City Public Works Engineer may:
(a) Reject the wastes;
(b) Require pretreatment and screening to an acceptable condition for discharge to the public sewers;
(c) Require control over the quantities and rate of discharge; and/or
(d) Require payment to cover the added cost of handling and treatment of wastes not covered by existing taxes or sewer charges under the provisions of this chapter.
(2) When considering the above alternative, the City Public Works Engineer shall give consideration to the economic impact of each alternative on the discharge. If the City Public Works Engineer permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the City Public Works Engineer, the Wastewater Superintendent and State Department of Environment and Natural Resources.
(D) Interceptors. Grease, oil and sand interceptors shall be provided in accordance with applicable plumbing codes and, when in the opinion of the City Public Works Engineer in coordination with the Wastewater Superintendent, they are necessary for the proper handling of liquid wastes containing floatable grease in excessive amounts as specified in this chapter, or any flammable wastes, or harmful ingredients that may adversely affect the wastewater collection or treatment system.
(1) Grease interceptors.
(a) The City Public Works Engineer or the Wastewater Superintendent shall have the right of approval of the design, sizing and installation of all grease interceptors.
(b) All kitchen drainage receiving grease shall pass through the interceptor. The interceptor shall be easily accessible for cleaning and inspection. The responsibility of cleaning and maintaining the interceptor in an efficient operating condition shall be the owner and/or lessee’s responsibility.
(c) In the maintaining of these interceptors, the owner(s) shall be responsible for the proper removal and disposal by appropriate means of the captured material and shall maintain records of the dates, and means of disposal which are subject to review by the City Public Works Engineer or the Wastewater Superintendent.
(d) Existing interior replacements may be allowed when proper sizing and installation procedures can be accomplished.
(e) When, in the opinion of the City Public Works Engineer, it would be impractical or unnecessary to install a full-size grease interceptor due to the nature or relative size of a food establishment, the installation of an inline grease trap may be approved.
(f) Expense shall not be considered sufficient reason to waive the requirements for full-size grease interceptors.
(g) Single-family dwelling units are exempt from the grease interceptor requirements.
(2) Sand and particulate interceptors.
(a) The City Public Works Engineer shall have the right of approval of the design, sizing and installation of all sand and particulate interceptors.
(b) All interceptors shall be of a type and capacity approved by the City Public Works Engineer, and shall be located as to be readily and easily accessible for cleaning and inspection.
(c) In the maintaining of these interceptors, the owner(s) shall be responsible for the proper removal and disposal by appropriate means of the captured material and shall maintain records of the dates, and means of disposal which are subject to review by the City Public Works Engineer or the Wastewater Superintendent.
(E) Pretreatment of industrial wastes.
(1) Where pretreatment or flow-equalizing facilities are provided or required for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner(s) at his or her expense.
(2) When required by the City Public Works Engineer, the owner(s) of any property serviced by a sanitary sewer carrying industrial wastes shall install a suitable structure together with such necessary meters and other appurtenances in the sanitary sewer to facilitate observation, sampling and measurement of wastes. Such structures, when required, shall be accessibly and safely located, and shall be constructed in accordance with plans approved by the City Public Works Engineer, and SD-DENR where required. The structure shall be installed by the owner at the owner’s expense and shall be maintained by the owner so as to be safe and accessible at all times.
(3) The City Public Works Engineer may require a user of sewer services to provide information needed to determine compliance with this chapter. These requirements may include:
(a) Wastewaters discharge peak rate and volume over a specified time period;
(b) Chemical analysis of wastewaters;
(c) Information on raw materials, processes and products affecting wastewater volume and quality;
(d) Quantity and disposition of specific liquid, sludge, oil, solvent or other materials important to sewer use control;
(e) A plot plan of sewers on the user’s property showing sewer and pretreatment facility location;
(f) Details of wastewater pretreatment facilities; and
(g) Details of systems to prevent and control the loss of materials through spills to the municipal sewer.
(4) All measurements, tests and analysis of the characteristics of waters and wastes to which reference is made in this chapter shall be determined in accordance with the procedures approved under ARSD 74:52:03:06 a. b. r., 40 C.F.R. part 136, unless other test procedures, sampling methods, locations, times, durations and frequencies are required by the City Public Works Engineer and/or the Wastewater Superintendent.
(5) No statement contained in this chapter shall be construed as preventing any special agreement or arrangement between the city and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the city for treatment.
(F) Guidelines for commercial sewage dumping.
(1) Permit fee. An annual dumping permit will be required of all commercial wastewater haulers wishing to dump at the site. A permit can be attained by a formal application and payment of the dumping permit fee, which will be set by Council and subject to change. This permit is for a period of January 1 through December 31. This permit can be revoked if contractor fails to follow the guidelines set forth.
(2) Dumping rates. There shall be a base dumping rate for the first 1,000 gallons, and an additional rate charged for each 1,000 gallons over base, which shall be set by Council and subject to change.
(3) Commercial sewage dumping hours. Commercial sewage dumping must be coordinated in advance and may only occur between the hours of 7:00 a.m. and 3:30 p.m., Monday through Friday. No dumping will occur on Saturdays, Sundays, holidays or any other leave days authorized by the city.
(4) Rules. An accurate and complete log of all dumps is required. Failure to accurately report will result in suspension or termination of dumping privileges.
(5) Spillage. A spillage/garbage fee shall be applied to any contractor who is found to have spilled anywhere at the sump site, or dumped garbage into the system. The spillage/garbage fee shall be set by Council, and subject to change. Should spill/garbage result in drainage into any storm sewer drain, the contractor will also be billed the cost of a sanitary sewer overflow test, as required by the state.
(Ord. 1195, passed 12-3-2018; Ord. 1250, passed 11-6-2023) Penalty, see § 52.99