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. w ~ ~ ~ . . Colorado River Compact, the Upper Colorado River Basin Compact, or the Treaty .~ with the United Mexican States (Treaty Series 994). , This report is consistent with the EPA-approved 1975 and 1978 reports and deals only with the portion of the Colorado River Basin above Imperial Dam. As used in this report, the lower main stem of the Colorado River system is defined as that portion of the main river from Hoover Dam to Imperial Dam. Below Imperial Dam, the river's salinity will be controlled to meet the terms of the agreement with Mexico on salinity in Minute 242 of the Inter- national Boundary and Water Commission, entitled "Permanent and Definitive Solution to the International Problem of the Salinity of the Colorado River." This agreement states that measures will be taken to assure that the waters delivered to Mexico upstream from Morelos Dam will have an annual average salinity concentration of no more than 115 ppm (+30 ppm) total dissolved solids greater than the annual average salinity concentration of Colorado River water arriving at Imperial Dam. Title I of Public Law 93-320 is the legislation which implements the provisions of Minute 242. Minute 242 and Title I constitute a federal numeric criterion and plan of implementation for the river below Imperial Dam. Forum Activities Since 1978 During the 1978-1980 period the Forum has developed baseline values for 13 monitoring sites and adopted a policy for the use of brackish and/or saline water for industrial purposes. The 1975 report called for the development of the baseline values. Copies of the baseline values and the Forum policy for the use of saline water for industrial purposes and the baseline,values developed are included in Appendices A and B to this report~ 3 ,