Chapter 13.40
PROHIBITED DISCHARGES
Sections:
13.40.010 Discharge of certain liquids to sanitary sewers prohibited.
13.40.030 Discharge of certain prohibited wastes designated.
13.40.040 Water-softening brine waste—Discharge regulations.
13.40.050 Waste discharge subject to director review—Preliminary treatment determined by director.
13.40.060 Pretreatment facilities and operating procedures review.
13.40.070 Acceptable wastes determined by director.
13.40.080 Regulation of industrial wastewater flows.
13.40.090 Federal pretreatment standards—Purpose Application—Limitations.
13.40.010 Discharge of certain liquids to sanitary sewers prohibited.
No person shall discharge or cause to be discharged any storm water, surface water, ground water, roof runoff, subsurface drainage, cooling water, swimming pool water, swimming pool backwash water, or unpolluted industrial process waters to any sanitary sewer. (Ord. 648 § 1 (part), 1982)
13.40.020 Stormwater.
Stormwater and all unpolluted drainage shall be discharged to such sewers as are specifically designated as storm sewers, or to a natural outlet approved by the director. Industrial cooling water or unpolluted process waters may be discharged, upon approval of the director, to a storm sewer or natural outlet. Appropriate permits from all affected public or private agencies as may be required by the city shall be obtained by the applicant. (Ord. 648 § 1 (part), 1982)
13.40.030 Discharge of certain prohibited wastes designated.
No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
A. Any gasoline, benzene, naphtha, solvent, fuel oil or any liquid, solid or gas that would cause or tend to cause flammable or explosive conditions to result in the sewerage system;
B. Any waste containing toxic or poisonous solids, liquids or gases in such quantities that, alone or in combination with other waste substances, may create a hazard for humans, animals or the local environment, interfere detrimentally with wastewater treatment processes, cause a public nuisance or cause any hazardous condition to occur in the sewerage system;
C. Any waste having a pH lower than 6.0 or higher than 9.0, or having any corrosive or detrimental characteristic that may cause injury to wastewater treatment or maintenance personnel or may cause damage to structures, equipment or other physical facilities of the sewerage system;
D. Any solids or viscous substances of such size or in such quantity that they may cause obstruction to flow in the sewer or be detrimental to proper wastewater treatment plant operations. These objectionable substances include, but are not limited to, asphalt, dead animals, offal, ashes, sand, mud, straw, industrial process shavings, metal, glass, rags, feathers, tar, plastics, wood, whole blood, paunch manure, bones, hair and fleshings, entrails, paper dishes, paper cups, milk containers, or other similar paper products, either whole or ground;
E. Any rainwater, storm water, ground water, street drainage, subsurface drainage, roof drainage, yard drainage, water from yard fountains, ponds or lawn sprays or any other uncontaminated water;
F. Any water added for the purpose of diluting wastes which would otherwise exceed applicable maximum concentration limitations;
G. Any water or waste containing grease, as follows:
1. Floatable grease in excess of twenty-five parts per million. Grease is an oil, fat, grease or other ether-soluble matter. Floatable grease is grease which rises to the surface of quiescent sewage or waste or upon dilution of the sewage or waste with fresh or salt water;
2. Dispersed grease, other than soap, in excess of five hundred parts per million. Dispersed grease is grease, which is not floatable;
H. Any excessive concentrations of nonbiodegradable oil, petroleum oil, soluble oil or refined petroleum products;
I. Any dispersed biodegradable oils and fats, such as lard, tallow or vegetable oil in excessive concentrations that would tend to cause adverse effects on the sewerage system;
J. Any wastes with excessively high BOD, COD or decomposable organic contents;
K. Any strongly odorous waste or waste tending to create odors;
L. Any wastes containing over 0.1 milligrams/liter of dissolved sulfides;
M. Any wastes with pH high enough to cause alkaline incrustations on sewer line walls;
N. Any substance promoting or causing the promotion of toxic gases;
O. Any wastes having a temperature of one hundred twenty degrees Fahrenheit or higher;
P. Any wastes requiring an excessive quantity of chlorine or other chemical compound used for disinfection purposes;
Q. Any wastes producing excessive discoloration of wastewater or treatment plant effluent;
R. Any garbage of waste that is not ground sufficiently to pass through a three-eighths-inch screen;
S. Any blow down or bleed water from cooling towers or other evaporative coolers exceeding one-third of the makeup water;
T. Recognizable portions of the human anatomy;
U. Any wastewater containing in excess of the following: 15.0 mg/1 aluminum, 1.0 mg/l arsenic, 0.25 mg/l cadmium, 0.5 mg/1 chromium, 0.5 mg/1 copper, 7.5 mg/1 fluoride, 30.0 mg/1 iron, 0.5 mg/l lead, 0.01 mg/1 mercury, 0.1 mg/1 selenium, 3.0 mg/l zinc, 2.0 mg/1 M.B.A.S. (foaming agent), 1.0 mg/1 phenol, 30.0 mg/1 ammonia, 300.0 mg/1 sulfate, 7.5 mg/1 boron or any other objectionable materials toxic to humans, animals, the local environment or to biological or other wastewater treatment processes. (Ord. 648 § 1 (part), 1982)
13.40.040 Water-softening brine waste—Discharge regulations.
Plants discharging water-softening brine shall not be restricted in the concentrations of total dissolved solids, sodium or chloride, or the wastewater discharged. However, such plants shall make all reasonable efforts to minimize the discharge of these substances. Reasonable efforts include brine reclamation and use of minimum effective quantities of salt for regenerating portable exchange units. A maximum of twelve pounds net of sodium chloride per cubic foot of portable exchange water softener units regenerated shall not be exceeded. Such plants shall maintain records of monthly sodium chloride usage and monthly volume of portable exchange units regenerated and shall make these records available to the city for review upon request. (Ord. 648 § 1 (part), 1982)
13.40.050 Waste discharge subject to director review—Preliminary treatment determined by director.
A. The admission into the public sewers of any waters or wastes having:
1. A five-day biochemical oxygen demand greater than three hundred parts per million by weight; or
2. Containing more than three hundred fifty parts per million by weight of suspended solids; or
3. Containing any quantity of substances having the characteristics described in Sections 13.40.010, 13.40.020, 13.40.030 and 13.40.040; or
4. Having an average daily flow greater than two percent of the average daily sewage flow of the city, shall be subject to the review and approval of the director.
B. Where necessary to the opinion of the director, the owner shall provide, at his expense, such preliminary treatment as may be necessary to:
1. Reduce the biochemical oxygen demand to three hundred parts per million and the suspended solids to three hundred fifty parts per million by weight; or
2. Reduce objectionable characteristics or constituents to within the maximum limits provided for in Section 13.40.030; or
3. Control the quantities and rates of discharge of such waters or wastes. (Ord. 648 § 1 (part), 1982)
13.40.060 Pretreatment facilities and operating procedures review.
Any facilities requiring either zone change, use permit, industrial waste permit or pretreatment to a level acceptable to the director shall be provided and maintained at the user’s expense. Detailed plans showing the pretreatment facilities and operating procedures shall be submitted to the director for review and shall be approved by the director before construction or use of the facility. The review of such plans and operating procedures will in no way relieve the user from the responsibility of modifying the facility as necessary to provide the protection necessary to meet the requirements of this division. (Ord. 648 § 1 (part), 1982)
13.40.070 Acceptable wastes determined by director.
No person shall discharge or cause to be discharged to any public sewer which directly or indirectly connects to the city’s sewerage system any wastes, if in the opinion of the director such wastes may have an adverse or harmful effect on sewers, maintenance personnel, wastewater treatment plant personnel or equipment, treatment plant effluent quality, public or private property, or may otherwise endanger the public, the local environment or create a public nuisance. The director, in determining the acceptability of specific wastes, shall consider the nature of the waste and the adequacy and nature of the collection, treatment and disposal system available to accept the waste. (Ord. 648 § 1 (part), 1982)
13.40.080 Regulation of industrial wastewater flows.
The director shall from time to time prepare a list of the maximum permissible quantities or concentrations of certain constituents in industrial wastewater flows and otherwise issue detailed directions for meeting the requirements of this chapter. (Ord. 648 § 1 (part), 1982)
13.40.090 Federal pretreatment standards—Purpose—Application—Limitations.
A. Effluent limitations promulgated by the Federal Water Pollution Control Act, PL 92-500, shall apply in any instance where they are more stringent than those in this Section 307(b) of the Act; Federal pretreatment standards are designed to achieve two purposes:
1. To protect the operation of publicly owned treatment works; and
2. To prevent the discharge of pollutants which pass through such works inadequately treated.
B. Users in industrial categories subject to effluent guidelines issued under Section 304(b) of the Act, which are discharging incompatible pollutants to public-owned treatment works, are required to adopt best practicable control technology currently available, as defined by the administrator pursuant to Section 304(b) of the Act. For some industrial categories it may be necessary to define pretreatment guidelines for problems that may arise as a result of the discharge into publicly owned treatment works. However, any adjustments required for particular industrial categories should be considered in connection with the city’s requirements rather than in the national pretreatment standards.
C. Limitations on wastewater strength in this chapter may be supplemental with more stringent limitations if:
1. The city determines that the limitations in Section 7501-B may not be sufficient to protect the operation of the city’s treatment plant; or
2. The city determines that the limitations in Section 7501-B may not be sufficient to enable the city’s treatment plant to comply with water quality standards or effluent limitations. (Ord. 648 § 1 (part), 1982)