§ 360-18. Restricted discharges.

The following-described substances, materials, waters or waste shall be limited in their discharges into municipal systems to concentrations or quantities which are not likely to harm the sewers, wastewater treatment process or equipment, will not have an adverse effect on the receiving stream and will not otherwise endanger life, limb, public property or constitute a nuisance. The superintendent may set more severe limitations that the limitations established in the regulations below if, in his opinion, such more severe limitations are necessary to meet the above objectives. In forming his opinion as to the limitations, the superintendent 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, degree of treatability of the waste in 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 superintendent are as follows:

A. 

No wastewater having a temperature higher than 140º F.

B. 

No wastewater containing more than 25 milligrams per liter of petroleum oil, nonbiodegradable cutting oils or product of mineral oil origin.

C. 

No wastewater from industrial plants containing floatable oils, fat or grease.

D. 

No 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. 

No 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 superintendent for such materials.

F. 

No waters or wastes containing odor-producing substances exceeding limits which may be established by the superintendent.

G. 

No radioactive wastes or isotopes or such half-life or concentration as may exceed limits established by the superintendent in compliance with applicable state or federal regulations.

H. 

No quantities of flow or concentrations, or both, which constitute a slug as defined herein.

I. 

No waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or which are amenable to treatment only to such a degree that the wastewater treatment plan effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters. The wastewater shall not contain more than 350 milligrams per liter (mg/1) of BOD5, 900 mg/l of COD or 300 mg/l of suspended solids.

J. 

No waters or wastes which, by interaction with other waters 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.

K. 

No waters or wastes having an objectionable color which is not removable in the wastewater treatment facility.