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<br />A. ENGINEERING -- HYDROLOGY <br /> <br />1. Colorado River Salinity Program <br /> <br />The Upper Colorado River Commission has continued its interest and <br />involvement in the Colorado River Basin salinity problem. The Commission staff has <br />worked with representatives of the Commission's member States in coordinating and <br />correlating activities with other State and Federal agencies, particularly the Colorado <br />River Basin Salinity Control Forum, which is composed of representatives from the <br />seven Colorado River Basin States. The Forum has developed water quality <br />standards and a plan of implementation to meet the Environmental Protection Agency <br />Regulation (40 CFR Part 120, Water Quality Standards--Colorado River System: <br />Salinity Control Policy and Standards Procedures). <br /> <br />Section 303 of the Clean Water Act requires that water quality standards <br />be reviewed from time to time and at least once during each three-year period. The <br />Forum in 2002 reviewed the existing State-adopted and Environmental Protection <br />Agency-approved numeric salinity criteria and found no reason to recommend <br />changes for the three lower mainstem stations. <br /> <br />The values are: <br /> <br />Salinitv in (mQ/I) <br /> <br />Below Hoover Dam ............ . . . . . . . . . . . . . .. 723 <br />Below Parker Dam ........................... 747 <br />Imperial Dam ............................. . " 879 <br /> <br />The Forum is continuing to study salinity conditions and to develop new <br />salinity projections. The Forum is also developing flow versus salt load relationships <br />that will reflect present and anticipated conditions. Salinities at each of the three <br />lower mainstem stations for which numeric criteria have been established have <br />decreased since 1972. <br /> <br />8 <br />