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INDUSTRIAL WASTE DISCHARGE STANDARDS
For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
APPROVING AUTHORITY. The Mayor or his or her duly authorized representative.
BOD (BIOCHEMICAL OXYGEN DEMAND). The quantity of oxygen by weight, expressed in milligrams per liter, utilized in the biochemical oxidation of organic matter under standard laboratory conditions for five days at a temperature of 20°C.
BUILDING SEWER. The extension from the building drain to the public sewer or other place of disposal. (Also called HOUSE LATERAL and HOUSE CONNECTION.)
COD (CHEMICAL OXYGEN DEMAND). A measure of the oxygen-consuming capacity of inorganic and organic matter present in the water or wastewater, expressed in milligrams per liter as the amount of oxygen consumed from a chemical oxidant in a specific test, but not differentiating between stable and unstable organic matter and thus not necessarily correlating with biochemical oxygen demand.
CONTROL MANHOLE. A manhole giving access to a building sewer at some point before the building sewer discharge mixes with other discharges in the public sewer.
CONTROL POINT. A point of access to a course of discharge before the discharge mixes with other discharges in the public sewer.
GARBAGE. Animal and vegetable wastes and residue from preparation, cooking and dispensing of food, and from the handling, processing, storage and sale of food products and produce.
INDUSTRIAL WASTE. Waste resulting from any process of industry, manufacturing, trade or business or from the development of any natural resource, or any mixture of the waste with water or normal wastewater, or distinct from normal wastewater.
INDUSTRIAL WASTE CHARGE. The charge made on those persons who discharge industrial wastes into the city’s sewerage system.
MILLIGRAMS PER LITER (mg/l). The same as parts per million and is a weight-to-volume ratio; the milligram-per-liter value multiplied by the factor 8.34 shall be equivalent to pounds per million gallons of water.
NATURAL OUTLET. Any outlet into a watercourse, ditch, lake or other body of surface water or ground water.
NORMAL DOMESTIC WASTEWATER. Wastewater excluding industrial wastewater discharged by a person into sanitary sewers and in which the average concentration of total suspended solids is not more than 200 mg/l and BOD is not more than 200 mg/l.
OVERLOAD. The imposition of organic or hydraulic loading on a treatment facility in excess of its engineered design capacity.
pH. The measure of the relative acidity or alkalinity of water and is defined as the negative logarithm (base 10) of the hydrogen ion concentration.
PUBLIC SEWER. Pipe or conduit carrying wastewater or unpolluted drainage in which owners of abutting properties shall have the use, subject to control by the city.
SANITARY SEWER. A public sewer that conveys domestic wastewater or industrial wastes or a combination of both, and into which storm water, surface water, ground water and other unpolluted wastes are not intentionally passed.
SLUG. Any discharge of water, wastewater or industrial waste which in concentration of any given constituent, or in quantity of flow, exceeds for any period of duration longer than 15 minutes more than five times the average 24-hour concentration or flow during normal operation.
STANDARD METHODS. The examination and analytical procedures set forth in the latest edition, at the time of analysis, of Standard Methods for the Examination of Water and Wastewater, as prepared, approved and published jointly by the American Public Health Association, the American Water Works Association and the Water Pollution Control Federation.
STORM SEWER. A public sewer which carries storm water and surface water and drainage, and into which domestic wastewater or industrial wastes are not intentionally passed.
STORM WATER. Rainfall or any other form of precipitation.
SUPERINTENDENT. The Water and Wastewater Superintendent of the city, or his or her duly authorized deputy, agent or representative.
TO DISCHARGE. Includes to deposit, conduct, drain, emit, throw, run, allow to seep or otherwise release or dispose of, or to allow, permit or suffer any of these acts or omissions.
TOTAL SUSPENDED SOLIDS (TSS). Solids, measured in milligrams per liter, that either float on the surface of, or are in suspension in, water, wastewater or other liquids, and which are largely removable by a laboratory filtration device.
TRAP. A device designed to skim, settle or otherwise remove grease, oil, sand, flammable wastes or other harmful substances.
UNPOLLUTED WASTEWATER. Water containing:
(1) No free or emulsified grease or oil;
(2) No acids or alkalis;
(3) No phenols or other substances producing taste or odor in receiving water;
(4) No toxic or poisonous substances in suspension, colloidal state or solution;
(5) No noxious or otherwise obnoxious or odorous gases;
(6) Not more than ten mg/l each of TSS and BOD; and
(7) Color not exceeding 50 units as measured by the platinum-cobalt method of determination as specified in Standard Methods.
WASTE. Rejected, unutilized or superfluous substances in liquid, gaseous or solid form resulting from domestic, agricultural or industrial activities.
WASTEWATER. A combination of the water-carried waste from residences, business buildings, institutions and industrial establishments, together with any ground water, surface water and storm water that may be present.
WASTEWATER FACILITIES. All facilities for collection, pumping, treating and disposing of wastewater and industrial wastes.
WASTEWATER SERVICE CHARGE. The charge on all users of the public sewer system whose wastes do not exceed in strength the concentration values established as representative of normal wastewater.
WASTEWATER TREATMENT PLANT. Any city-owned facilities, devices and structures used for receiving, processing and treating wastewater, industrial waste and sludges from the sanitary sewers.
WATERCOURSE. A natural or human-made channel in which a flow of water occurs, either continuously or intermittently.
(1998 Code, § 122-61) (Ord. 08-46, passed 11-19-2008)
(A) No person may discharge to public sewers any waste which by itself or by interaction with other wastes may:
(1) Injure or interfere with wastewater treatment processes or facilities;
(2) Constitute a hazard to humans or animals; or
(3) Create a hazard in receiving waters of the wastewater treatment plant effluent.
(B) All discharges shall conform to requirements of this chapter.
(1998 Code, § 122-62) Penalty, see § 51.99
(A) No discharge to public sewers may contain:
(1) Cyanide greater than one mg/l;
(2) Fluoride other than that contained in the public water supply;
(3) Chlorides in concentrations greater than 250 mg/l;
(4) Gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid or gas; or
(5) Substances causing an excessive chemical oxygen demand (COD).
(B) No waste or wastewater discharged to public waters may contain:
(1) Strong acid, iron pickling wastes or concentrated plating solutions, whether neutralized or not;
(2) Fats, wax, grease or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0° and 65°C);
(3) Objectionable or toxic substances exerting an excessive chlorine requirement, to the degree that the material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the approving authority for the materials; or
(4) Obnoxious, toxic or poisonous solids, liquids or gases in quantities sufficient to violate the provisions of § 51.26(A) of this chapter.
(C) No waste, wastewater or other substance may be discharged into public sewers which has a pH lower than 5.5 or higher than 9.5, or any other corrosive property capable of causing damage or hazard to structures, equipment and personnel at the wastewater facilities.
(D) All waste, wastewater or other substances containing phenols, hydrogen sulfide or other odor-producing substances shall conform to concentration limits established by the approving authority. After treatment of the composite wastewater, concentration limits may not exceed the requirements established by state, federal or other agencies with jurisdiction over discharges to receiving waters.
(1998 Code, § 122-63) Penalty, see § 51.99
(A) No discharges may contain concentrations of heavy metals greater than amounts specified in division (B) below.
(B) The maximum allowable concentrations of heavy metals, stated in terms of milligrams per liter, determined on the basis of individual sampling in accordance with Standard Methods are:
Metal | mg/l |
Metal | mg/l |
Arsenic | 0.05 |
Barium | 5.0 |
Boron | 1.0 |
Cadmium | 0.02 |
Chromium (total) | 5.0 |
Copper | 1.0 |
Lead | 0.1 |
Manganese | 1.0 |
Mercury | 0.005 |
Nickel | 1.0 |
Selenium | 0.02 |
Silver | 0.1 |
Zinc | 5.0 |
(C) In determining the concentration parameters to be included in this chapter, current state, federal and other appropriate agency rules, regulations and orders should be consulted, including Order 70-0828-5 of the State Water Quality Board regulating the discharge of hazardous metals into or adjacent to state waters.
(D) No other heavy metals or toxic materials may be discharged into public sewers without a permit from the approving authority specifying conditions of pretreatment, concentrations, volumes and other applicable provisions.
(E) Prohibited heavy metals and toxic materials include, but are not limited to:
(1) Antimony;
(2) Beryllium;
(3) Bismuth;
(4) Cobalt;
(5) Molybdenum;
(6) Tin;
(7) Uranyl ion;
(8) Rhenium;
(9) Strontium;
(10) Tellurium;
(11) Herbicides;
(12) Fungicides; and
(13) Pesticides.
(1998 Code, § 122-64) Penalty, see § 51.99
(A) No person may discharge garbage into public sewers unless it is shredded to a degree that all particles can be carried freely under the flow conditions normally prevailing in public sewers. Particles greater than one-half inch in any dimension are prohibited.
(B) The approving authority is entitled to review and approve the installation and operation of any garbage grinder equipped with a motor of 1.33 horsepower or greater.
(1998 Code, § 122-65) Penalty, see § 51.99
(A) No person may discharge to public sanitary sewers:
(1) Unpolluted storm water, surface water, ground water, roof runoff or subsurface drainage;
(2) Unpolluted cooling water;
(3) Unpolluted industrial process waters; or
(4) Other unpolluted drainage.
(B) In compliance with the State Water Quality Act (Tex. Water Code §§ 26.001 et seq.) and other statutes, the approving authority may designate storm sewers and other watercourses into which unpolluted drainage described in division (A) above may be discharged.
(1998 Code, § 122-66) Penalty, see § 51.99
No person may discharge liquid or vapor having a temperature higher than 150°F (65°C), or any substance which causes the temperature of the total wastewater treatment plant influent to increase at a rate of 10°F or more per hour, or causes a combined total increase of plant influent temperature to 110°F.
(1998 Code, § 122-67) Penalty, see § 51.99
(A) No person may discharge radioactive wastes or isotopes into public sewers without the permission of the approving authority.
(B) The approving authority may establish, in compliance with applicable state and federal regulations, regulations for discharge of radioactive wastes into public sewers.
(1998 Code, § 122-68) Penalty, see § 51.99
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