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<br />. <br /> <br />CHAPTER 1 - INTRODUCTION <br /> <br />Purpose of Report <br /> <br />g This report, the 1999 Review, Water Quality Standards for Salinity, Colorado River System <br />~ (Review) is prepared and submitted in response to Section 303( c) of the Clean Water Act', Prepared <br />"-1 by the seven-state Colorado River Basin Salinity Control Forum (Forum), on behalf ofthe governors <br />oftheir respective states, this Review of the water quality standards includes the numeric criteria and <br />the plan of implementation developed and adopted by the Forum, It also includes modifications to <br />previous reviews that have become necessary as a result of changed conditions and the availability <br />of additional information, This Review is the eighth triennial review conducted by the Forum, <br />Section 303(c)(I) of the Clean Water Act requires that: <br /> <br />The governor of a state or the state water pollution control agency of such state shall <br />from time to time (but at least once each three-year period beginning with the date <br />of enactment of the Federal Water Pollution Control Act Amendments of 1972) hold <br />public hearings for the purpose of reviewing applicable water quality standards and, <br />as appropriate, modifYing and adopting standards, Results of such review shall be <br />made available to the Administrator, <br /> <br />. <br /> <br />This Review is consistent with the Environmental Protection Agency (EPA)-approved 1975 <br />standards and deals only with that portion of the Colorado River Basin above Imperial Dam, While <br />this Review will recap past events in an abridged format, its focus is on information gathered since <br />issuance of the 1996 Review, Background information and activities regarding historical actions <br />relative to the development and adoption of salinity standards is contained in the June 1975 <br />standards report2, The prior seven Reviews, from 1978 to 1996, contain more specific information <br />on the seven 3-year periods, <br /> <br />Below Imperial Dam, salinity is controlled as a federal responsibility to meet the terms of <br />the agreement with Mexico contained within Minute No. 242 of the International Boundary and <br />Water Commission (IBWC), entitled "Permanent and Definitive Solution to the International <br />Problem ofthe Salinity ofthe Colorado River," Minute No. 242 requires that measures be taken to <br />assure that Colorado River water delivered to Mexico upstream from Morelos Dam will have an <br />average annual salinity concentration of no more than 115 io 30 parts per million (ppm) total <br />dissolved solids (TDS) higher than the average annual salinity concentration of Colorado River water <br />arriving at Imperial Dam, <br /> <br />lPublic Law [P,L.I 92-500 as amended by P,L. 95-217 and P.L. 100-4 <br /> <br />. <br /> <br />2Water Quality Standards for Salinitv. Including Numeric Criteria and Plan of Imolementation for <br />Salinitv Control. Colorado River Svstem, Colorado River Basin Salinity Control Forum, June 1975, <br /> <br />I-I <br />