9.10.072 Pretreatment of industrial waste.
Under standards established by the United States Environmental Protection Agency, the city has the right and the obligation to establish guidelines for the pretreatment of industrial wastes.
(1) Review and acceptance of the city council shall be obtained prior to the discharge into the public sewers of any waters or wastes having a total suspended solids content greater than three hundred fifty parts per million.
(2) The allowable pH of industrial wastes discharged to the sewage works depends on the location of the discharge according to the following:
(A) No industrial user shall discharge liquids into the industrial pretreatment system having a pH lower than 5.0 or higher than 11.0, or having any corrosive properties capable of causing damage or hazards to structures, equipment, processes, or personnel of the sewage plant.
(B) No industrial user shall discharge liquids into the public sewers other than the industrial pretreatment system, having a pH lower than 6.0 or higher than 9.0, or having any corrosive properties capable of causing damage or hazards to structures, equipment, processes, or personnel of the sewage plant.
(3) All industrial wastes shall be pretreated at the source to meet the minimum standards established by the United States Environmental Protection Agency as now exists or are later amended. The city shall actively encourage the industrial users to institute in-plant measures to reduce the quantity and strength of industrial wastewater flows to assist the city in achieving the best practicable treatment and to increase the quality of the effluent discharged from the sewage treatment plant. If the minimum standards set by the EPA fail to achieve the above objectives as shown through a local analysis, then the city reserves the right to establish more stringent requirements for pretreatment. Where required to modify or eliminate wastes that are harmful to the structures, processes, or operation of the sewage disposal works or which fail to meet minimum discharge standards, the industrial user shall provide at its expense such preliminary treatment or processing facilities as may be deemed necessary to render its waste acceptable for admission to the public sewers. Plans, specifications, and any other pertinent information relating to proposed preliminary treatment or processing facilities shall be submitted to the city for their review and approval prior to the issuance of a building permit or the start of any construction if the effluent from such facilities is to be discharged into the public sewers.
(4) If the sewage treatment plant's efficiency, stability, or performance is threatened as determined by tests conducted by the city, by the industrial user's excess use beyond maximum daily allocations, then the city may reduce the water intake to the industrial user. (Ord. 1408,, 1998; Ord. 1394,, 1998.)