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. . At page 33 the report states, .With salinity concen- trations about 60 mg/l below the numeric criteria at the lower mainstem stations is highly unlikely that the criteria will be exceeded during the next 12 month period." (See also the proposed 1978 Revision Water Quality Standards for Salinity Including Numeric Criteria and Plan of Imple- mentation for Salinity Control, Colorado River System, prepared by Colorado River Basin Salinity Control Forum, August, 1978, pages 6 through 23, the cover page of which is attached hereto as Exhibit 3 a full copy has been sub- mitted by the state as an exhibit.) United States Responsibility for Salinity Control In recognition of the fact that near.ly 70% of the land within the Colorado River Basin is federally owned or con- trolled and the fact that between 50% and two-thirds of the salinity contribution is from natural sources, Congress specifically addressed the Colorado River Basin Salinity Control solution and accepted responsibilities for bearing the primary financial burden for control through enactment of the Colorado River.Basin Salinity Control Act of 1974. This Act was prompted also by the need to provide a means for insuring that the allocation of Colorado River water to Mexico was of satisfactory quality pursuant to Minute 242 of the treaty between the United States and Mexico. The 1974 Act resulted in approval of the basin-wise approach to salinity control with specific recognition of the rights under the Colorado River Compact and Upper Colorado River Compact. For a thorough discussion as to the interaction between the Salinity Control Act of 1974 and the Colorado River Compacts and the Congressional recognition of the states' rights under the Acts, see the Memorandum in Support of Motion to Dismiss, Matters Concerning the Role of Inter- state Compacts of the Colorado River on the Claims Presented by Plaintiff, submitted by Mountain States Legal Foundation, et al., defendant-intervenors, in &oF v. Costle, a copy of which is attached hereto as Exhibit-4. From this legislation it is apparent that Congress has recognized that the burden of meeting the Mexican Treaty insofar as salinity is concerned should not be borne by the water users of the Colorado River. Congress has also recognized that water remains undeveloped, particularly in the Upper Basin states, and that this water must be left free for future beneficial use by the states under the provisions of the compacts. It is important then for the state to follow this lead in not placing an onerous burden -4-