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<br />pollution discharge, The Act was interpreted by the EPA to <br />t-'" <br />u' require water quality standards, consisting of Dumerical <br />G <br />~j salinity criteria and a plan of implementation for the <br /> <br />Colorado River, Numerical criteria were subsequently <br /> <br />established at three stations by the Forum (Colorado River <br /> <br />Basin Salinity Control Forum), adopted by each of the Basin <br /> <br />States, and approved by EPA, <br /> <br />The criteria, set in terms of <br /> <br />milligrams per liter of TDS are: <br /> <br />Numeric Criteria Table <br /> <br />To meet these criteria, about 1,5 million tons per year of <br /> <br />salt will need to be removed from the river's waters by <br /> <br />about 2010, <br /> <br />The overall approach to meeting the standards <br /> <br />is to prevent salt from entering and mixing with the <br /> <br />river's flow, <br /> <br />A number of agricultural, point, and diffuse <br /> <br />sources of salinity have been identified throughout the <br /> <br />Basin, Those units which contain sources that can be <br /> <br />intercepted and prevented from entering the river at least <br /> <br />cost will be implemented to control the river's salinity. <br /> <br />1\t <br /> <br />In June 1974, Congress enacted the Colorado River Basin <br /> <br />Salinity Control Act, Public Law 93-320, which directed the <br /> <br />Secretary of the Interior to expedite the completion of <br /> <br />planning reports on 12 salinty control units and to proceed <br /> <br />with construction of the Paradox Valley, Grand Valley, <br /> <br />Crystal Geyser, and Las Vegas Wash Units. <br /> <br />5 <br />