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<br /> <br />CHAPfER 1 - INTRODUCTION <br /> <br />1;.1, <br />CD <br />W <br />(J.) <br /> <br />PuRPoSE OF REPORT <br /> <br />This report, the 1993 Review. Water Qnality Standards for Salinity. Colorado River <br />System (1993 Review) is in response to Section 303(c) of the Clean Water Act of 1977 (Public <br />Law 92-500 as amended by Public Law [p.L.] 95-217 and P.L. 100-4) referred to in this report <br />as the Clean Water Act. This report is the sixth Review prepared by the Forum. Section <br />303(c)(1) of the Clean Water Act requires that: <br /> <br />The governor of a state or the state water pOllution control agency of such state <br />shall from time to time (but at least once each three-year period beginning with <br />the date of enactment of the Federal Water Pollution Control Act Amendments of <br />1972) hold public hearings for the purpose of reviewing applicable water quality <br />standards and, as appropriate, modifying and adopting standards. Results of such <br />review shall be mode available to the Administrator. <br /> <br />This Review is written as a complete document, but contains information only for the <br />1990-1993 period. Background information regarding historical actions relative to the adoption <br />of salinity standards is contained in the June 1975 standards reportl. The 1978, 1981, 1984, <br />1987 and 1990 Reviews contain information pertaining to the 1975-1978 period, 1978-1981 <br />period, 1981-1984 period, 1984-1987 period, and 1987-1990 period, respectively. <br /> <br />This report, prepared by the seven-state Colorado River Basin Salinity Control Forum <br />(Forum) is a review of the water quality standards including numeric criteria and plan of <br />implementation previously developed and adopted by the Forum. This Review includes the <br />modifications to the 1990 Review and the October 1990 Supplement that have become necessary <br />as a result of changed conditions and the availability of better information. <br /> <br />HISTORY AND BACKGROUND <br /> <br />In the 1960s and early 1970s, the seven Colorado River Basin states2 and representatives <br />of the Federal Government discussed the problem of increasing salinity levels in the lower <br />reaches of the Colorado River. In 1972, the Federal Government enacted the Clean Water Act <br />which mandated efforts to maintain water quality standards in the United States. At the same <br />time, Mexico and the United States were discussing increasing salinity levels in Colorado River <br />water being delivered to Mexico. In 1974, with Basin states' support, the Congress enacted the <br />Colorado River Basin Salinity Control Act (p.L. 93-320). Title I of that Act addresses the <br />United States' commitment to Mexico. <br /> <br />lWater Quality Standards for Salinity. Including Numeric Criteria and Plan of <br />Implementation for Salinity Control. Colorado River System. <br /> <br />2The seven Colorado River Basin states (Arizona, California, Colorado, Nevada, New <br />Mexico, Utah and Wyoming) shall be referred to as the "Basin states." <br /> <br />