(A) The following described substances, materials, waters, or wastes may be discharged into the system only in 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, limb, public property, or constitute a nuisance. The Superintendent may set limitations lower than the limitations established in the regulations below if in his opinion such more severe limitations are necessary to meet the above objectives. Deliberate dilution to meet the concentrations established in the regulations below is not permitted. In forming his opinion as to acceptability, the Superintendent will give consideration to such facts as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the wastewater treatment plant, degree of treatability of the waste in the wastewater treatment plant, and other pertinent factors. The limitations or restrictions on material or characteristics of waste or wastewater discharged into the system which shall not be violated without approval of the Superintendent are as follows:
(1) Wastewater having a temperature higher than 150ºF.
(2) Wastewater containing more than 50 milligrams per liter of petroleum oil, nonbiodegradable cutting oils, products of mineral oil origin, or floatable oils, fat, wax ,or grease.
(3) 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.
(4) (a) Wastewater containing solids, liquids either singly or by interaction with other wastes to injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, or waters of the system, including but not limited to cyanides, hexavalent chromium, copper, zinc, cadmium, nickel and phenols in the waste as discharged to the public sewer. The following concentrations shall not be exceeded in industrial wastes discharged to the public sewers:
Substance
| Concentration (milligrams per liter) |
Substance
| Concentration (milligrams per liter) |
Cadmium | 0.2 |
Copper | 1.0 |
Cyanide (CN) | 0.5 |
Hexavalent Chromium | 1.0 |
Lead | 0.5 |
Mercury | 0.01 |
Nickel | 2.0 |
Phenols | 0.2 |
Silver | 0.2 |
Zinc | 1.5 |
A ph level of 6 S.U. minimum and a maximum level of 9.5 S.U. | |
(b) These maximum concentrations may be changed as necessary by the Superintendent or state regulatory agencies based on new information concerning inhibitory substances or to protect treatment plant processes. Industrial dischargers covered by federal pretreatment requirements shall meet those limitations specified under effluent guidelines published under Section 304b) and 307b) of the federal act or the above concentrations, whichever is more stringent.
(5) Wastewater or wastes containing odor-producing substances exceeding limits which may be established by the Superintendent or any local or state regulatory agencies.
(6) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits in compliance with applicable state or federal regulations.
(7) Quantities of flow, concentrations or both which constitute a “slug” as defined herein.
(8) Wastewater containing substances which are not amenable to treatment or reduction by the wastewater treatment works, or are amenable only to such degree that the wastewater treatment works effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters; or substances that would result in a violation of the NPDES permit.
(9) Wastewater which by interaction with other water or wastes in the System, releases obnoxious gases, forms suspended solids which interfere with the collection system, or creates a condition deleterious to structures and treatment processes.
(10) Any wastes with objectionable color not removable by the treatment process.
(B) All testing to identify any of the above mentioned pollutants, waters, or wastes shall be in accordance with the latest edition of Standard Methods for the Examination of Water and Wastewater.
(Ord. 1498, passed 7-21-86; Am. Ord. 2583, passed 6-15-09) Penalty, see § 51.99