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<br />w <br />Ut <br />W <br />I-' <br /> <br /> <br />the National pollutant Discharge Elimination System (NPDES) <br />permit program, on industrial and municipal discharges. <br />The purpose of this policy is to provide more detailed <br />guidance in the application of salinity standards developed <br />pursuant to Section 303 and through the NPDES permitting <br />authority in the regulation of municipal and industrial <br />sources. (See Section 402 of the Federal Water Pollution <br /> <br />Control Act.) This policy is applicable to discharges that <br />would have an impact, either direct or indirect on the lower <br />main stem of the Colorado River System. The lower main stem <br />is defined as that portion of the main river from Hoover Dam <br />to Imperial Dam. <br />I. Industrial Sources <br />The Salinity Standards state that "the objective for <br />discharges shall be a no-salt return policy whenever <br />practicable." This is the policy that shall be followed <br />in issuing NPDES discharge permits for. all new <br />industrial sources, and upon the reissuance of permits <br />for all existing industrial sources, except as provided <br /> <br />herein. The following addresses those cases where no- <br />discharge of ,salt may be deemed not to be practicable. <br />A. New Construction <br /> <br />1. New construction is defined as any facility from. <br />which a discharge may occur, the construction of <br />which is commenced after October 18, 1975. <br />(Date of submittal of water quality standards <br /> <br />-2- <br />