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<br />SillMA.RY <br /> <br />The Federal Water Pollution Control Act Amendments of 1972, <br /> <br />PL 92-500, in Section 303 require the adoption of water quality <br /> <br />standards applicable to interstate waters. Pursuant to that <br /> <br /> <br />requirement, the Environmental P~otection Agency on December 1S, <br /> <br />1974, issued a regulation requiring the states of.the Colorado <br /> <br />,. <br /> <br />River Basin to adopt water quality standa'rds for salinity, con- <br /> <br />sisting of numeric criteria and plan of implementation for salL~ity <br /> <br />control. The standards are to be submitted for approval to the <br /> <br />Environmental Protection Agency on or before October IS, 1975. <br /> <br />This report, prepared by the 7-State Colorado River BasL~ <br /> <br />Salinity Control Forum, presents in a single document the water <br /> <br />quality standards for salinity submitted for adoption by each of <br /> <br />the states in the Basin. T~e standards are to be reviewed at 3-year <br /> <br />intervals and modified, if appropriate. <br /> <br />Consistent with the regulation, the recommended flow-wei&hted <br /> <br />average annual numeric salL1ity criteria for three locations in <br /> <br />the lower main stem of the Colorado River System are a3 follows: <br /> <br />Salinity in me/l <br /> <br />The plan of implementation comprises a n~oer of federal and <br />nonfederal projects and measures to maintain the flow-weighted <br />average annual salinity in the lower main stem at or below-the <br /> <br />recommended numeric criteria through 1990, as the Basin States <br /> <br />continue to develop their compact-apportioned waters. The principal <br /> <br />components of the plan are as follows: <br /> <br />-i- <br />