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development, national categorical pretreatment standards, or best professional <br />judgment of the city. If state, federal, and local discharge limits are different, then <br />the most stringent limit shall apply. Dilution of the wastestream to achieve an <br />allowable discharge limit is prohibited. <br />"Milligrams per liter (mg/Z). A weight-to-volume ratio equivalent to parts per <br />million. <br />"National pollutant discharge elimination system (NPDES) permit. A permit <br />issued pursuant to Section 402 of the Act (33 USC 1342). <br />"Natural outlet. Any outlet into a watercourse, ditch, lake or other body of <br />surface water or groundwater. <br />"New source. Any user who commences discharge to the POTW after the <br />publication of a proposed federal pretreatment standard under section 307 (c) of the <br />Act applicable to such user and thereafter promulgated in accordance with that <br />section, provided that: <br />"(1) a. The facility is constructed at a site at which no other source is <br />located; or <br />"b. The facility totally replaces the process or production equipment that <br />causes the discharge of pollutants at an existing source; or <br />"c. The production or wastewater generating processes of the facility are <br />substantially independent of an existing source at the same time. In <br />determining whether these are substantially independent, factors such <br />as the extent to which the new facility is integrated with the existing <br />plant, and the extent to which the new facility is engaged in the same <br />general type of activity as the existing source should be considered. <br />"(2) Construction on a site at which an existing source is located results in a <br />modification rather than a new source if the construction does not create <br />a new building, facility or installation meeting the criteria of paragraphs <br />L(b) or (c) above, but otherwise alters, replaces or adds to existing <br />process or production equipment. <br />"(3) Construction of a new source as defined herein has commenced if the <br />owner or operator has: <br />"a. Begun, or caused to begin as part of a continuous onsite construction <br />program: <br />"1) Any placement, assembly or installation of facilities or <br />equipment; or <br />9 <br />