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<br />I. Summary <br /> <br />5 <br /> <br /> <br />CONTENTS <br /> <br />w <br /><=> <br /><=> <br />~ Preface <br /> <br />Page <br /> <br />Scope of Problem <br />Salinity Issue <br />Econom ic and Other Analytic Studies <br />Status of Investigations <br />Research <br /> <br />5 <br />6 <br />6 <br />8 <br />11 <br /> <br />II. The Salinity Issue <br /> <br />13 <br /> <br />Sources of Salinity <br />Sal in ity Levels . . <br />Projected Salinity Levels <br />Economic Impacts <br />Previous Studies and Findings <br />The EPA Enforcement Conference <br />Related Matters .,.., <br />Authorization of Investigations <br />Salinity Investigations <br />Long Range Outlook <br /> <br />13 <br />13 <br />15 <br />16 <br />16 <br />19 <br />21 <br />22 <br />23 <br />25 <br /> <br />III. Economic and Other Analytic Studies <br /> <br />29 <br /> <br />Introduction ....... <br />Economic Studies ..... <br />Program Alternatives and Constraints <br />River System Modeling <br /> <br />29 <br />29 <br />35 <br />35 <br /> <br />IV. Status of Investigations . <br /> <br />39 <br /> <br />Paradox Valley Unit, Coiorado <br />Grand Valley Basin Unit, Colorado <br /> <br />39 <br />47 <br /> <br />Irrigation Management Services <br />Water Systems Improvement (WSI) <br /> <br />52 <br />53 <br /> <br />Crystal Geyser Unit, Utah . <br />Las Vegas Wash Unit, Nevada <br />LaVerkin Springs Unit, Utah <br />Irrigation Sources <br /> <br />60 <br />63 <br />70 <br />77 <br /> <br />Palo Verde Irrigation District Unit, California <br />Colorado River Indian Reservation Unit, Arizona <br />Uinta Basin Unit, Utah . . . , . . <br />Lower Gunnison Basin Unit, Colorado <br /> <br />78 <br />80 <br />83 <br />86 <br /> <br />Point Source Control <br /> <br />91 <br /> <br />Littlefield Springs Unit, Arizona <br />Glenwood-Ootsero Springs Unit, Colorado <br />Blue Springs Unit, Arizona ..... <br /> <br />91 <br />97 <br />104 <br />