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<br />Page 'fhree <br /> <br />. <br /> <br />. <br /> <br />0Xhib~t D - Letter to Barcia M. Hughes from Myron B. Holburt, <br /> <br />Chief Engineer, Colorado River Board of California, dated <br /> <br />Harch 7, 1980. <br /> <br />Exhibit E - Water Quality Criteria 1972 (the "Blue Book"), <br /> <br />pages 323-353, prepared by the U.S. Environmental Protection <br /> <br />Agency, Harch 1973. <br /> <br />II. A BASINWIDE APPROACH SHOULD BE FOLLOIVED <br /> <br />Salinity, or total dissolved solids (TDS) , occurs at low concen- <br /> <br />trations in the headwaters and its tributaries of the Colorado River <br /> <br />in Colorado, as well as in the other states in the upper basin of the <br /> <br />Colorado River: Utah, Wyoming and New Mexico. However, total dissolved <br /> <br />solids are conservative constituents, thus salinity concentrations <br /> <br />increase downstream. Increasing salinity is the result of both natural <br /> <br />and human causes which take place throughout the basin. The primary <br /> <br />effects from salinity concentrations occur .in the lower basin. Because <br /> <br />of this situation, the analysis and control of salinity in the Colorado <br /> <br />River is approached from a basinwide perspective. <br /> <br />The basinwide approach has been recognized frequently, For <br /> <br />example, note: 1) the Resolution of the Seventh Session of ' the <br /> <br />Conference in the Matter of Pollution of the Interstate Waters of the <br /> <br />Colorado River and Its Tributaries, Exhibit A, pages 6 and 7 and <br /> <br />Appendix C; 2) the Conclusions and Recommendations adopted by the <br /> <br />Conferees to the above-named conference, Exhibit At pages 7 and 8 and <br /> <br />Appendix C; 3) the statement of position adopted by the Colorado River <br /> <br />1401 <br />