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. . . w ..... w ..... CHAPTER I. INTRODUCTION Purpose of Report This report is in response to Section 303(c) of the Clean Water Act of 1977 (Public Law 92-500 as amended by Public Law 95-217) referred to in this report as the Clean Water Act. Section 3D3(c)(I) of the Clean Water Act requires that: The governor of a state or the state water pollution control agency of such state shall from time to time (but at least once each three-year period beginning with the date of enactment of the Federal Water Pollution Control Act Amendments of 1972) hold public hearings for the purpose of reviewing applicable water quality standards and, as appropriate, modifying and adopting standards. Results of such review shall be made available to the Administrator. This report, prepared by the seven-state Colorado River Basin Salinity Control Forum (Forum) is a review of the water quality standards including numeric criteria and plan of implementation previously developed by the Forum. This is the third report prepared by the Forum. This report includes the modifications or revisions to the 1978 Forum report and December 8, 1978 supplement that have become necessary as a result of changed conditions and the availability of better information. The Forum is composed of water resource and water quality representatives from each of the seven Colorado River Basin states of Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming. The Forum was established for the purpose of providing the states with the necessary information to meet the Environmental Protection Agency's (EPA) previous regulation, 40 CFR, Part 120, entitled "Water Qual ity Standards - Colorado River System: Sal inity Control Policy and Standards Procedures," and Section 303(a) and (b) of the Clean Water Act. The 1978 Forum report was prepared by the Forum in response to Section 303(c), as is this report. j -,' ,~~~