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<br />CHAPTEF. I <br />INTRODUCTION <br /> <br />The purpose of this report is to present water quality standards <br />for salinity for the Colorado River System, as required by the <br />Environmental Protection Agency regulation [40 CFR Part 120, Water <br />Quality Standards], published December 18, 1974. As used in the <br />report, the tem "standards" is defined in accordance with Environmental <br />Protection Agency teminolo~J to include both numeric criteria and the <br />plan of implementation for salinity control. The achievement of <br />numeric criteria requires the full implementation of the plan and <br />appropriate changes. The criteria are subject to revision upward or <br />downward as provided in this report. The report was prepared by the <br />Colorado River Salinity Control Forum, composed of water resource and <br />water quality representatives from the seven Colorado River Basin States <br />of Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming. <br />It provides the states with the necessa~ infomation to meet the <br />Enviror~ental Protection Agency regulation, which requires the states <br />to adopt water quality standards for salinity and submit them to the <br />Agency for approval on or before October 18, 1975. While the complete <br />regulation is presented in Appendix A, the most pertinent portion is <br />incorporated in the text of Chapter IV, "Water Quality Standards for <br />, <br />Salinity Control". <br />The report deals only with thepor~ion of the Basin above Imperial <br />Dam. Water quality control measures downstream from Imperial Dam <br />are being carried out in accordance \nth the provisions of Minute 242 <br />of the International Boundary and Water Commission, United States <br />and Mexico, and Title I of PL 93-320, the Colorado River Basin <br />Salinity Control Act. <br /> <br />-1- <br /> <br />-?J.) <br />'R <br />