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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 involvement <br />in the Colorado River Basin salinity problem. The Commission staff has worked with <br />representatives of the Commission's member States in coordinating and correlating <br />activities with other State and Federal agencies, particularly the Colorado River Basin <br />Salinity Control Forum, which is composed of representatives from the seven Colorado <br />River Basin States. The Forum has developed water quality standards and a plan of <br />implementation to meet the Environmental Protection Agency Regulation (40 CFR Part <br />120, Water Quality Standards--Colorado River System: Salinity Control Policy and Stan- <br />dards Procedures). <br /> <br />Section 303 of the Clean Water Act requires that water quality standards be <br />reviewed from time to time and at least once during each three-year period. The Forum <br />in 1996 reviewed the existing State-adopted and Environmental Protection <br />Agency-approved numeric salinity criteria and found no reason to recommend changes for <br />the three lower mainstem stations. <br /> <br />The values are: <br /> <br />Salinity in (mall) <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 salinity <br />projections. The Forum is also developing flow versus salt load relationships that will reflect <br />present and anticipated conditions. <br /> <br />Salinities at each of the three lower mainstem stations for which numeric criteria <br />have been established have decreased since 1972. <br /> <br />8 <br /> <br />j <br />