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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />-9- <br /> <br />C) <br />~ <br />~ <br />~ <br /> <br />economic detriments to the salinity sources as a means of <br />self-regulation. In addition, legislative action has already <br />set constraints, on allowable Lower Basin salinity levels, <br />so the planning problem is not to solve the problem in an <br />economically optimum fashion, but to meet the standard. <br />Thus, minimizing costs is consistent with the problem <br />structure. <br /> <br />PREVIOUS INVESTIGATIONS <br />Salinity of the Colorado River and its tributaries has <br />been the subject of many studies and investigations. Various <br />socio-economic, engineering, environmental and other aspects <br />of the salinity problem and potential control measures have <br />been pursued by the U.S. Department of the Interior; Water <br />and power Resources (formerly the Bureau OI Reclamation); <br />the U.S. Geological Survey; the U.S. Environmental Protec- <br />tion Agency and its predecessor agencies; the Water Resources <br />Council, Colorado River Board of California; U~S. Department <br />of Agriculture, Soil Conservation Service, and Science and <br />Education Administration (Agricultural Research); state and <br />local governmental entities; and several universities and <br />consulting engineering firms. <br />In 1975 Utah State University prepared a comprehensive <br />regional assessment report for the National Commission on <br />Water Quality on the Impacts of PL 92-500 (Federal Water <br />Pollution Control Act and amendments of 1972) on the salinity <br />problem of the Colorado River (Utah State U~iversity, 1975). <br />