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<br />-'I <br /> <br />FOREWORD <br /> <br />" <br /> <br />Virgin Valley Sub evaluation Unit, a portion of Virgin Piver Unit, <br />drains to Lake Mead on the Colorado River. See the map on inside of <br />front cover. Virgin Valley Subevaluation Unit was identified as a <br />problem area where irrigation and erosion are diffuse sources of salinity. <br />During the study, alternative solutions were identified and estimates <br />were made of effects of the plans on reducing salt loading to Colorado <br />River. <br /> <br />An interdisciplinary team carried out the study and prepared the <br />report. The "USDA Study Plan for the Virgin River Unit", revised August <br />1978, and the Soil Conservation Service (SCS) publication "Guide for <br />Environmental Assessment", March 1977 along with SCS environmental policy <br />and 7 CFR-650 were used as references. Information relating to evalua- <br />tion for compliance with the National Environmental Policy Act of 1969 <br />is in the appendices. <br /> <br />Contributions from other Federal and State of Nevada agencies are <br />acknowledged. Nevada Department of Wildlife information was used for <br />biological assessment. The United States Department of Interior (USDI) <br />Bureau of Reclamation (USBR) and Geological Survey (USGS) published <br />reports provided stream gage data and other information. Other data <br />~ncluded Clark County Conservation District's onfarm irrigation inventories, <br />and area wide water management planning reports prepared for Clark County, <br />Nevada. Clark County Conservation District disseminated information during <br />study and assisted with obtaining local participation in the planning process. <br /> <br />The USDA Science and Education Administration-Agricultural Research <br />(SEA-AR) Salinity Laboratory, Riverside, California, outlined study needs, <br />provided consultative assistance and analyzed water quality samples. <br />Their assistance in interpreting laboratory test results and reviewing <br />results of the study was very helpful. <br /> <br />i <br /> <br />l" ;\ r ('1 Q <br />, L 1;::..... v <br />