§ 13.12.070. Regulations.

A.

Clean Water Prohibition. Stormwater, surface water, groundwater, uncontaminated cooling water, artesian well water, roof runoff, subsurface drainage, condensate, deionized water, or unpolluted process water shall not be permitted to be discharged into the sanitary sewers. In residential construction, floor drains may not be connected to the building sewer.

B.

Prohibited Discharge Standards. No user shall contribute or cause to be contributed, directly or indirectly, any pollutant or wastewater which will damage and/or interfere with the operation or performance of the city of Salisbury wastewater treatment works (WTW) or pass through the city of Salisbury wastewater treatment plant (WWTP) and pollute the waters of the state. These general prohibitions apply to all such users of the WTW whether or not the user is subject to categorical pretreatment standards or any other federal, state or local pretreatment standards or requirements. A user shall not contribute the following substances to the wastewater treatment works:

1.

Any pollutant, liquid, solid or gas, which alone or in combination with any other pollutants may create a fire or explosion hazard in the wastewater treatment works, or at the wastewater treatment plant or damage, in any way, the operations of the wastewater treatment works or the wastewater treatment plant. Included are materials and/or wastestreams with a closed cup flash point of one hundred forty (140) degrees Fahrenheit (sixty (60) degrees Centigrade) using test methods specified in 40 CFR 261.21. At no time shall two successive readings on an explosion hazard meter exceed five percent nor any single reading exceed ten percent of the lower explosion limit (LEL) of the meter. Included are materials such as gasoline, kerosene, naphtha, and any other substances which the city, state (MDE), or EPA has informed the user is a fire hazard or hazardous to the system;

2.

Any liquid or vapor having a temperature in excess of one hundred fifty (150) degrees Fahrenheit (sixty-five (65) degrees Centigrade) or any heat that will inhibit the biological treatment activity of the wastewater treatment plant. Heat in such quantities that could cause the temperature of the influent wastewater into the wastewater treatment plant to exceed one hundred four (104) degrees Fahrenheit (forty (40) degrees Centigrade), unless the state (MDE), upon request of the city approves alternate temperature limits;

3.

Solid or viscous pollutants in amounts which will cause obstruction of the flow or cause other interferences at the city of Salisbury wastewater treatment plant and related facilities but in no case solids greater than one-half inch in any dimension. Included, but not limited to, are materials such as floating grease, garbage, animal guts and/or tissues, whole blood, entrails, bones, hair, hides, fleshings, ashes, cinders, sand, mud straw, spent lime, stone or marble dust, metal, grass clippings, shavings, glass, glass grinding or polishing waste, rags, feathers, tar, gas, asphalt residues, residues from refining or processing of fuel and/or lubricating oils, plastics, wood, spent grains, spent hops, waste paper, paunch or manure;

4.

Any discharge having a pH value of less than 5.5 or more than 10.5, or otherwise causing corrosive structural damage to the WTW or endangering city personnel;

5.

Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass through at the WWTP;

6.

Toxic pollutants, or pollutants which singly or by interaction with other pollutants, result in the presence of toxic gases, vapors, or fumes within the city of Salisbury wastewater treatment works and/or cause interference to any wastewater treatment process, constitute an acute hazard to worker health or safety, or pass through the wastewater treatment plant and pollute the waters of the state;

7.

Any wastewater and/or noxious or malodorous liquids, gases or solids which either singly or by interaction with other waste, are sufficient to create a public nuisance, a hazard to life, or prevent entry into the sewers for maintenance and repair;

8.

Any substances which may cause the WWTP's effluent or any product of the WWTP such residues, sludges or scums to be unsuitable for reclamation and reuse or to interfere with the reclamation process. In no case shall a substance discharged to the WWTP cause the WWTP to be in noncompliance with sludge use or disposal criteria, guidelines or regulations developed under Section 405 of the Act, the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act or state criteria applicable to the sludge management method being utilized;

9.

Any substance which will cause the WWTP to violate its NPDES permit and/or state disposal system permit or the receiving water quality standards, including whole effluent quality standards;

10.

Any wastewater containing pollutants, including oxygen demanding pollutants (BOD, etc.), released in a discharge as a slug load, at a release (flow) rate and/or concentration which, either singly or by interaction with other pollutants, will cause interference with either the WWTP, or any wastewater treatment or sludge process, or which will constitute a hazard to humans or animals, or create a public nuisance. In no case shall the maximum daily average concentration limit of three hundred fifty (350) mg/l for five-day biochemical oxygen demand be exceeded;

11.

Any medical wastes in amounts that could cause interference, pass through, or worker health and safety concerns within the wastewater treatment works;

12.

Any wastewater containing any radioactive wastes or isotopes;

13.

Any sludges, screenings, or other residues from the pretreatment of industrial waste;

14.

Any trucked or hauled waste or pollutants, except at discharge points designated by the city;

15.

Any water or wastes discharge containing fats, oils, or greases of animal or vegetable origin is limited to a concentration of one hundred fifty (150) mg/l;

16.

Any wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to dye waste and vegetable tanning solutions.

Wastes prohibited by this section shall be not processed or stored in such a manner that they could be discharged to the WWTP.

C.

Pretreatment Standards and Requirements. All industrial users shall comply with the federal general pretreatment regulations found in 40 CFR Part 403 and the applicable national categorical pretreatment regulations set out in 40 CFR Subchapter N, Parts 401 through 471 upon promulgation and all applicable federal, state or local requirements or standards.

D.

Application of Pretreatment Standards and Requirements. Limitations imposed on users at the point of application shall be the most stringent limitations applicable. These may be federal, state or local requirements or standards.

E.

Specific Pollutant Limitations. The following pollutant limits are established to protect against pass through and interference. No person shall cause to be discharged wastewater containing in excess of the following:

Pollutant	Concentration	Limitation
Five-day biochemical oxygen demand	350 mg/l	Maximum daily average
Total suspended solids	350 mg/l	Maximum daily average
Fats, oils and grease	150 mg/l	Instantaneous maximum
Total phosphorus	11 mg/l	Maximum daily average
Total mercury	0.001 mg/l	Maximum daily average
Total arsenic	0.24 mg/l	Maximum daily average
Total cadmium	0.69 mg/l	Maximum daily average
Total chromium	2.77 mg/l	Maximum daily average
Total copper	3.38 mg/l	Maximum daily average
Total cyanide	1.20 mg/l	Maximum daily average
Total lead	0.20 mg/l	Maximum daily average
Total molybdenum	0.54 mg/l	Maximum daily average
Total nickel	3.98 mg/l	Maximum daily average
Total silver	0.43 mg/l	Maximum daily average
Total zinc	2.61 mg/l	Maximum daily average

 

Limitations for other pollutants will be set in each industrial user's individual wastewater discharge permit as established by a technically based local limits study and approved by the engineer and Maryland Department of the Environment.

F.

City's Right of Revision. The city reserves the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the WTW if deemed necessary to comply with the objectives in Section 13.12.020 of this chapter or the general and specific prohibitions in Section 13.12.070(A) and (B) of this chapter.

G.

Dilution/Excessive Discharge. No industrial user shall ever increase the use of process water, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limitation. The engineer may impose mass limitations on industrial users which are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.

(Ord. 1985, 2006; Ord. 1983 (part), 2006)