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w ~ 0) 0) of Reclamation (Reclamation) being investigate several salinity control Agriculture was instructed to support authorities. See page 30 regarding under P.L. 93-320. instructed to build and uni ts. The Secretary of the effort wi thin exis1~ing the specific authorization In 1984, the Colorado River Basin Salinity Control Act was amended. This was the first major legislative change since the 1974 enactment of the authorization for the program (P.L. 93-320). The 1984 legislative amendments directed the Secretaries of the Interior, and Agriculture to give preference to the salinity control units which reduce salinity at the least cost per unit of salinity reduction. Stage I of the Lower Gunnison Basin Unit, Colorado, and the McElmo Creek Unit (as 'a part of the Dolores Participating Proj ect), Colorado, were both authorized. The Crystal Geyser Unit, Utah, authorized in 1974, was de-authorized. A major provision of the legislation was the enactment of a voluntary onfarm salinity control program to be administered by the Department of Agriculture. Further, the Secretary was directed to allow for the voluntary replacement of fish and wildlife values foregone as irrigation improvements were implemented. The Forum is composed of water resource and water quality representatives from each of the seven Colorado River basin states (Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming) appointed by the governors of the respective states. The Forum was established for the purpose of interstate cooperation and to provide the states with the information necessary to meet the Environmental Protection Agency's (EPA) regulation, 40 CFR, Part 120, entitled Water Quality Standards, Colorado River System: Salini ty Control POlicy and Standards PJ;'ocedures and Section 303 ( a) and (b) of the Clean Water Act. The four previous reviews were conducted by the Forum in response to Section 303(c), as is this report. The 1975 Forum rep0rt includes a detailed discussion of the legislation and events leading up to the establishment of salinity standards for the lower main stem of the Colorado River. The standards were adopted by all of the Basin states and subsequently approved by the EPA. The 1978, 1981, 1984, and 1987 reports reviewed the numeric criteria included in the 1975 report and concluded that no change was warranted; however, the plan of implementation was updated to reflect the circumstances at those times and changes that had taken place in the salinity control projects status since 1975. The plan of implementation, asset forth in this and the earlier Forum Reviews, includes effluent limitations for indus'rial point source discharges with the objective of no-salt return whenever practicable. In February 1977, the Forum adopted the "Policy for Implementation of Colorado River Salinity Standard" Through the NPDES Permit Program." This policy provides detailed guidance in the application of salinity standards in the regulation 2