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AY. Sewer. Any pipe, conduit, ditch, or other device used to collect and transport sewage <br /> from the generating source. <br /> AZ. Shall, May. "Shall" is mandatory, "may" is permissive. <br /> BA. Significant Industrial User(SIU). <br /> (1) A user subject to categorical pretreatment standards; or <br /> (2) A user that: <br /> (a) Discharges an average of 25,000 GPD or more of process wastewater to <br /> the POTW (excluding sanitary, non-contact cooling, and boiler blowdown <br /> wastewater); or <br /> (b) Contributes a process wastestream which makes up five (5) percent or <br /> more of the average dry weather hydraulic or organic capacity of the <br /> POTW treatment plant; or <br /> (c) Is designated as such by the City on the basis that it has a reasonable <br /> potential for adversely affecting the POTW's operation or for violating any <br /> pretreatment standard or requirement. <br /> (3) Upon a finding that a user meeting the criteria in Subsection two (2) has no <br /> reasonable potential for adversely affecting the POTW's operation or for violating <br /> any applicable pretreatment standard or requirement, the City may at any time, on <br /> its own initiative or in response to a petition received from a user [and in <br /> accordance with procedures in 40 CFR 403.8(0(6)] determine that such user <br /> should not be considered a significant industrial user. <br /> BB. Slug Load. Any discharge at a flow rate or concentration which could cause a violation of <br /> the discharge standards in Section 2.1 through 2.4 of this ordinance or any discharge of a <br /> non-routine, episodic nature, including but not limited to, an accidental spill or a non- <br /> customary batch discharge, or any discharge greater than or equal to five (5) times the <br /> amount or concentration allowed by permit or this ordinance. <br /> BC. Standard Industrial Classification (SIC) Code. A classification pursuant to the Standard <br /> Industrial Classification Manual issued by the United States Office of Management and <br /> Budget. <br /> BD. State. The State of Washington. <br /> BE. Storm Water. Any flow occurring during or following any form of natural precipitation, <br /> and resulting from such precipitation, including snowmelt. <br /> BF. Total Suspended Solids. The total suspended matter that floats on the surface of, or is <br /> suspended in, water, wastewater, or other liquid, and which is removable by laboratory <br /> filtering and is amenable to measurement by the methods described in Standard Methods <br /> for the examination of Water and Wastewater, 18th edition, 1992. <br /> 7 <br />