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<br />A. ENGINEERING - HYDROLOGY <br /> <br />1. Coiorado 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 <br />staff has worked with representatives of the Commission's member States <br />in coordinating and correlating activities with other State and Federal <br />agencies, particularly the Colorado River Basin Salinity Control Forum, which <br />is composed of representatives from the seven Colorado River Basin States. <br />The Forum has developed water quality standards and a plan of implementa- <br />tion to meet the Environmental Protection Agency Regulation (40 CFR Part <br />120, Water Quality Standards--Colorado River System: Salinity Control Policy <br />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 <br />period. The Forum in 1990 reviewed the existing State-adopted and <br />Environmental Protection Agency-approved numeric salinity criteria and found <br />no reason to recommend changes for the three lower mainstem stations. <br /> <br />The values are: <br /> <br />Salinitv in <br />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 <br />salinity projections. The Forum is also developing flow versus salt load <br />relationships that will reflect present and anticipated conditions. <br /> <br />Salinities at each of the three lower mainstem stations for which numeric <br />criteria have been established have decreased since 1972. <br /> <br />8 <br />