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Table 2. - Population data for the Upper and Lower Colorado River Basins [lJ* Year Lower Upper Colorado Colorado Colorado River Basin Basin Basin 1,565,000 338,000 1,903,000 3,275,000 537,000 3,812,000 5,225,000 1,040,000 6,265,000 109 59 100 60 94 64 1960 population 1980 popu 1 at ion 2000 projection 1960-1980 (percent increase) 1980-2000 (percent increase) Goals and Objectives The objective of the Clean Water Act (Public Law 92-500 as amended by Public Law 95-217) is to restore and maintain the chemical, physical, and biological integrity of the Nation's waters. It declares that the national goals are to eliminate discharge of pollutants into navigable waters by 1985, with an interim goal of attaining by July 1983 water quality which provides for the protection and propagation of fish, shellfish, and wild- life, and for recreation in and on the Nation's waters. The Act authorizes the EPA (Environmental Protection Agency) to provide grants for research or demonstration projects and construction of treatment works to Federal agencies, States, or private organizations. It also authorizes the EPA to publish and revise, from time to time, water quality criteri a and to revi se standards to include intrastate as well as inter- state streams. Primary implementation responsibilities are largely dele- gated to the States. In response to the Federal Water Pollution Control Act (Public Law 92-500), as amended, the Colorado River Basin States adopted salinity control stand- ards, including numeric criteria [described in terms of milligrams per liter (mg/L) of local dissolved solids (TDS)J for the Colorado River and a plan of implementation. These standards criteria, shown in table 3 for three stations on the lower mainstem of the Colorado River, have been approved by the EPA. * Numbers in brackets indicate references at the end of this report. 8