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B . Project Background The Colorado River Basin Salinity Control Act of 1974, Public Law 93-320 (88 Stat. 266, June 24, 1974) provides for the construc- tion, operation, and maintenance of certain works in the Colorado River Basin to control the salinity of water delivered to users in the United States and Mexico. Under this act, the Secretary of the Interior is authorized and directed to proceed with a basinwide program for the enhancement and protection of the quality of Colorado River water. Title I of the Act establishes the Colorado River Basin Salinity Control Project and provides for measures to enable the United States to comply with its obligations under the agreement with Mexico of August 30, 1973, Minute No. 242 of the International Boundary and Water Commission, United States and Mexico. In brief, Title I provides the means of meeting Minute 242 which dictates that the water delivered to Mexico be within 115 mg/L :!: 30 of that entering Imperial Dam upstream of the United States-Mexican border. Title II of the Act provides for programs to control the salinity of the Colorado River upstream from Imperial Dam, to meet the water quality standards as established by the basin states. Title II is essentially the Colorado River Water Quality Improve- ment Program (CRWQIP), a general investigation program developed in early 1971 by the WPRS after a conference of Colorado River Basin States and a subsequent report. Construction, operation, and main- tenance of four salinity control units are authorized under Title II. Funds were included in the Public Works Appropriation Act of 1975 for the start of advance planning activities in the four authorized unitsnparadox and Grand Valley Units in Colorado, the Crystal Geyser Unit in Utah, and the Las Vegas Wash Unit in Nevada. Title II also provides for expediting the completion of planning reports on other salinity control units, one of which is the La Verkin Springs Unit. 002510 3