(a) Wastes Prohibited. Except as provided by subsection (b) hereof, no person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
(1) BOD5 in excess of 200 mg/1.
(2) SS in excess of 250 mg/1.
(3) COD in excess of 450 mg/1.
(4) Chlorine demand in excess of 15 mg/1.
(5) Color, as from but not limited to dyes, inks, vegetable tanning solutions, shall be controlled to prevent light absorbency which would interfere with treatment plant processes or that prevent analytical determinations.
(6) Explosive liquid, solid or gas, gasoline, benzene, naphtha, fuel oil or other flammables shall not be admitted.
(7) Garbage not properly shredded (no particle size greater than one-half inch) shall not be allowed.
(8) Grease, oils, wax, fat, whether emulsified or not, in excess of fifty mg/1; or other substances which may solidify or become viscous at temperatures between thirty-two degrees Fahrenheit and one hundred fifty degrees Fahrenheit shall not be admitted to the sanitary sewer.
(9) Industrial wastes in concentrations above those listed below shall not be allowed to enter sanitary sewers: Cd; Cn, Cr+6, Cr total, CU, FE, Ni, Pb, Phenols, Zn, Hg. Limitations set forth by appropriate State agencies to comply with Federal guidelines for protection of treatment plant and receiving watercourse, or any other metallic compounds in sufficient quantity to impair the operation of the sewage treatment processes.
(10) Inert suspended solids, such as, but not limited to Fullers earth, lime slurries and lime residues, or of dissolved solids, such as, but not limited to, sodium chloride and sodium sulfate, in unusual concentrations shall not be allowed.
(11) Insoluable, solid or viscous substances such as, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, tar, feathers, plastics, wood, hair, fleshings, etc., shall not be admitted to sanitary sewers.
(12) Noxious or malodorous gas, such as, but not limited to, hydrogen sulfide, sulphur dioxide or oxides of nitrogen, and other substances capable of producing a public nuisance shall not be allowed.
(13) pH less than 5.5 and greater than 9.5 shall not be allowed.
(14) Radioactive wastes or isotopes of such half-life or concentration which may exceed limits established by applicable State and Federal regulations, shall not be allowed.
(15) Temperature of wastes less than thirty-two degrees Fahrenheit and greater than one hundred fifty degrees Fahrenheit shall not be allowed.
(16) Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(b) Disposition. If any waters are discharged, or are proposed to be discharged to the public sewers, which waters contain the substances or poses the characteristics enumerated in this section, and which in the judgment of the City Manager or Superintendent may have a deleterious effect upon the sewage works, process, equipment or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the City may:
(1) Reject the wastes.
(2) Require pretreatment to an acceptable condition for discharge to the public sewers.
(3) Require control over the quantities and rates of discharge.
(4) Require payment to cover the added cost of handling and treating the wastes not covered by sewer charges under the provisions of Section 921.13.
(5) Where the strength of sewage from an industrial, commercial or institutional establishment exceeds normal domestic sewage of 200 milligrams per liter of five-day biochemical oxygen demand; or 250 milligrams per liter of suspended solids and where such wastes are permitted to be discharged to the sewer system by the City, an added charge, as noted below, will be made against such establishment according to the strength of such wastes. The strength of such wastes shall be determined by composite samples taken over a sufficient period of time to insure a representative sample. The cost of sampling and testing shall be borne by the industry or establishment whether owner or lessee. Tests shall be made by an independent laboratory or at the City waste water treatment plant.
Added charges shall be determined by the formula below. These charges shall be based on the cost of operation and maintenance for the sewage works. The surcharge to be computed by the formula:
Cs = (Bc(B) + Sc(s)) Vu
Where:
Cs = A surcharge for waste waters of excessive strength.
Vu = Volume contribution from a user per unit of time.
Bs = O & M cost for treatment of a unit of biochemical
oxygen demand (BOD).
B = Concentration of BOD from a user above a base
level.
Sc = O & M cost for treatment of a unit of suspended
solids.
S = Concentration of ss from a user above a base level.
(c) Approval of Treatment or Control. If the City permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the City, and subject to the requirements of all applicable State agencies' codes, ordinances and laws. Where preliminary treatment or flow equalizing facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at his expense.
(1977 Code Sec. 13.09)