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4 <br /> <br />with Sections 307(b) and (c) of the Act (33 USC 1317) which apply to a specific <br />category of users and which appear in 40 CFR Chapter I, Subchapter N, Parts 405 - <br />471. <br />K. Categorical User (Categorical Industrial User). A user covered by one of EPA's <br />Categorical Pretreatment Standards. <br />L. Chemical Oxygen Demand (COD). A measure of the oxygen consuming capacity <br />of inorganic and organic matter present in wastewater amenable to <br />measurement by the methods described in Standard Methods for the <br />examination of Water and Wastewater, current approved edition. COD is <br />expressed as the amount of oxygen consumed from a chemical oxidant in mg/L <br />during a specific test. <br />M. City. The City of Everett, Washington. <br />N. Cooling Water/Non-Contact Cooling Water. Water used for cooling which does <br />not come into direct contact with any raw material, intermediate product, waste <br />product, or finished product. Cooling water may be generated from any use, <br />such as air conditioning, heat exchangers, cooling or refrigeration to which the <br />only pollutant added is heat. <br />O. Color. The optical density at the visual wave length of maximum absorption, <br />relative to distilled water. One hundred percent (100%) transmittance is <br />equivalent to zero (0.0) optical density. <br />P. Combined Sewer. A sewer receiving both surface runoff and sewage. <br />Q. Commercial User. A Commercial User is any discharger of Industrial Waste that <br />does not meet the definition of a Significant Industrial User. <br />R. Composite Sample. The sample resulting from the combination of individual <br />wastewater samples taken at selected intervals based on an increment of either <br />flow or time. <br />S. Daily Maximum Limit. The maximum allowable discharge limit of a pollutant <br />during a calendar day. Where Daily Maximum Limits are expressed in units of <br />mass, the daily discharge is the total mass discharged over the course of the day <br />(lb/day). Where Daily Maximum Limits are expressed in terms of a <br />concentration, the daily discharge is the arithmetic average measurement of the <br />pollutant concentration derived from all measurements taken that day <br />T. Day. Day shall be defined as a calendar day. <br />U. Director. The Public Works Director, or such Director’s duly authorized <br />representative.