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(A) Every person, firm or corporation whose premises are served by a sanitary sewer connection and discharges wastes other than “normal sewage” into the sewerage system of the city shall pay an “extra strength surcharge” in addition to the sewage service charge for “normal sewage”. NORMAL SEWAGE is defined as that which contains pollutants in concentrations no greater than listed below:
Concentration (in mg/l)
Oil and grease
(B) For the purpose of this section, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
BOD or BIOCHEMICAL OXYGEN DEMAND. The quantity of oxygen utilized in the biochemical oxidation of organic matter, under standard laboratory procedure, in five days at 20°C.
COD or CHEMICAL OXYGEN DEMAND. A measure of the oxygen equivalent of the organic matter that can be measured using a strong chemical oxidizing agent in an acidic medium.
OG or OILS AND GREASES. Those materials extractable from an acidified sample by Freon and other acceptable solvents in accordance with approved laboratory produces.
P or PHOSPHORUS. Measured as phosphorus.
TOC or TOTAL ORGANIC CARBON. A measure of the organic matter present in wastewater determined by injecting a known quantity of sample into a high temperature furnace, oxidizing to carbon dioxide in the presence of a catalyst and measuring the quantity produced. TOC may be used to reflect BOD or COD.
TOD or TOTAL OXYGEN DEMAND. A measure of the oxygen required by the organic and some inorganic substances determined by heating a sample in a platinum catalyzed combustion chamber and monitoring the oxygen content present in the nitrogen carrier gas.
TSS or TOTAL SUSPENDED SOLIDS. Solids that either float on the surface of or are in suspension in water, sewage or other liquids, and which are removable by laboratory filtering.
(C) Industrial waste surcharges shall be determined according to the following procedure:
(1) (a) Whenever the wastes are ruled acceptable for wastewater treatment and the wastewater contains BOD and/or COD, suspended solids, phosphorus and/or oil and grease in excess of normal sewage, the excess shall be subjected to a monthly surcharge for each constituent as follows:
0.30/lb Oil and greases
(b) Charges will be based either on extra strength COD or BOD, plus other parameters listed. These rates will be effective immediately upon passage of this section.
(c) In addition to the surcharge, the user will pay the regular sewer service charge on the entire volume of sewage discharged to the sewerage system.
(2) Each industry subject to the provisions of the extra strength surcharge shall submit monthly, on a timely basis, the certified daily flow and analysis of the extra strength discharge to the sewerage system.
(3) The Superintendent of Utilities shall determine which sampling test (BOD, COD, TOC, TOD and the like) is representative of actual wastewater loadings and specify the type and frequency of analysis necessary for monitoring discharges and for billing purposes.
(4) The Superintendent will evaluate the waste strength, and these determinations shall be binding as a basis for charges.
(5) The volume of flow used for computing industrial waste surcharges shall be metered water consumption of the user as shown in the records of meter readings maintained by the city’s Water Department or metered wastewater discharged to the city’s sewer system.
(a) If the user discharging industrial wastewater into the POTW procures any part, or all, of their water from sources other than the city’s water system, all or part of which is discharged into the public sewers, the user shall install and maintain, at his or her expense, water meters of a type approved by the Superintendent for the purpose of determining the volume of water obtained from those other sources.
(b) Devices for measuring the volume of waste discharged may be required by the Superintendent if these volumes cannot otherwise be determined from the metered water consumption records.
(c) Metering devices for determining the volume of waste shall be installed, owned, and maintained by the user. Following approval and installation, such meters may not be removed without the consent of the Superintendent. The volume of flow used for computing industrial waste surcharges shall be determined as provided in this division (C).
(Prior Code, § 1054.26) (Ord. 59-1991, passed 4-8-1991; Ord. 190-2002, passed 11-12-2002; Ord. 149-2013, passed 9-9-2013; Ord. 142-2016, passed 12-12-2016)