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. . . Golorado Ri.ver Basin Sa-l i.nity .Gontrol-Project Title I Division Desalting Complex Unit STATUS REPORT Apri 1 1977 (Covering Activities Through June 1976) FOR EloJOR D Authorization to construct, operate, and maintain the Desalting Complex Unit was approved June 24, 1974,in Section 101 of Public Law 93-320, the Colorado River Basin Salinity Control Act. The September 1973 Special Report, Colomdo River International Salinity Control p"oject, prepared jointly by the Bureau of Reclamation and Office of Saline Water, is the basis for the project authorization. This Status Report presents the findings of advance planning studies and project activities through June 1976. Some project construction activities were underway at that time, while other project activities, such as the design of the Yuma Oesalting Plant, will undergo future modification prior to implementation. Because of the need for a document describing signifi- cant project activities since authorization, while simultaneously recognizing that some project features will not be finalized in plan until 1978 or 1979, available information is presented in this Status Report. The most significant reason for preparation of this report is the need to describe a conceptional design of the Yuma Desalting Plant. This design, completed in December 1975, was prepared for the purpose of scoping per- formance, structures, and equipment requirements as a basis for requesting and evaluating proposals for furnishing membrane desalting equipment. _. I.h~J~~uJ!~-.9i advance p]anni_n~t~~i~.!:~sented_ in this Status Report are refinements and modifications of concepts of authorized project measures. Changes in general consist of refined hydrologic studies for desalting plant sizing; inclusion of desalting plant pretreatment and equipment performance characteristics as determined from information provided by manufacturers, and by testing with actual plant feed water; identification of specific fish and wildlife mitigation measures; and updating costs. The refinements and modifications do not add features to or delete features from the authorized plan, or change the objective results of the plan. This report does not include conclusions of studies on reject stream replace- ment alternatives. These studies are ongoing and are scheduled to be com- pleted in fiscal year 1980. This report also does not include the findings of advance planning studies on the Coachella Canal Unit and the Protective and Regulatory Pumping Unit, authorized by Sections 102 and 103, respectively, of Public Law 93-320. Definite Plan Reports will be prepared later for each of these un its.