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<br />TABLE OF CONTENTS <br /> <br />FOREWORD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i <br /> <br />sUMMARY. . <br /> <br />.... <br /> <br />.......... ........................................ <br /> <br />INTRODUCTION <br />Authority for Salinity control.............................. <br />Objective and Scope.......................................... <br />Conflict Between Environmental Objectives and Existing Laws. <br />Executive Order 11990......... .. <br />Clean Water Act Section 303.. <br />Clean Water Act section 404. <br /> <br />.... <br /> <br />. . . . <br /> <br />.... <br /> <br />, <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />.. <br /> <br />. <br /> <br />, <br /> <br />.... <br /> <br />, <br /> <br />., <br /> <br />. <br /> <br />PURPOSE AND NEED FOR THIS ACTION <br />Problems and Needs Associated With Salt Loading,.. <br />Sources and Kinds of Salts....................... . <br />Potential Reduction of salts......................... <br />Problems and Needs Associated with Water Resource,... <br />Problems and Needs Associated With Erosion and <br />Sedimentation.............................................. . <br /> <br />. <br /> <br />" <br /> <br />EXISTING ENVIRONMENT <br />Location........... <br /> <br />. . <br /> <br />. <br /> <br />Physiography and Geology. <br />Soils......... <br /> <br />.. <br /> <br />.... .. <br /> <br />. . . . <br /> <br />. . . . . <br /> <br />. .. <br /> <br />.... <br /> <br />. <br /> <br />... <br /> <br />. . . . . . <br /> <br />.,. <br /> <br />. . . <br /> <br />Climate....... <br />Surface Water. <br />Ground Water.. <br />Water Rights and Water Use. <br />Water Budget.. <br />Water Quality.............. <br />Salt Budqet................ <br />AgricUltural systems and Practices. <br />Upper Moapa Valley. <br />Meadow Valley Wash. <br />Lower Moapa Valley. <br />Biotic Resources.. , <br />Fisheries. <br /> <br />.. .. <br /> <br />. .. <br /> <br />. <br /> <br />. <br /> <br />... <br /> <br />. <br /> <br />.. <br /> <br />. ... <br /> <br />, <br /> <br />" <br /> <br />.. ...... .. <br /> <br />. . <br /> <br />. .... <br /> <br />., <br /> <br />, <br /> <br />... . <br /> <br />, <br /> <br />. <br /> <br />, ,. <br /> <br />. <br /> <br />,. . <br /> <br />, .. <br /> <br />. <br /> <br />.... <br /> <br />. <br /> <br />. <br /> <br />Birds........ <br />Mammals..... . <br />Herpetofauna. <br />Wetland Resources. <br />Recreation Resources. <br />Social and Economic Characteristics. <br />Historic and Archeologic..... ........ <br /> <br />. <br /> <br />, <br /> <br />.. ...... . <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />.... <br /> <br />... .. <br /> <br />, <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />, <br /> <br />, <br /> <br />, <br /> <br />. <br /> <br />0031rS <br /> <br />Page <br /> <br />ii <br /> <br />. <br /> <br />1 <br />2 <br />2 <br />3 <br />3 <br />4 <br /> <br />.. <br /> <br />5 <br />5 <br />6 <br />8 <br /> <br />10 <br /> <br />. <br /> <br />13 <br />13 <br />16 <br />17 <br />17 <br />19 <br />19 <br />20 <br />23 <br />25 <br />28 <br />28 <br />28 <br />29 <br />31 <br />34 <br />35 <br />35 <br />35 <br />35 <br />36 <br />37 <br />38 <br /> <br />, <br /> <br />. <br /> <br />, <br /> <br />. <br />