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<br />. <br /> <br />W <br />l-'" <br />~ <br />W <br /> <br />. <br /> <br />. <br /> <br />Using the salt routing model, projections of future salinity levels were <br /> <br />made to determine the impact on salinity concentrations in the lower main <br /> <br />stem for the full range of assumed water supply conditions and the three <br />projected water use levels and under each of the following conditions: <br />1. No salinity control projects would be undertaken, but other <br />salinity control measures would be fully implemented. These measures <br />include no-salt return for industrial development within the Basin, as <br />set forth in the Forum-adopted and EPA-approved "Policy for Implementa- <br />tion of the Colorado River Salinity Standards Through the NPDES Permit <br />Program," February 28, 1977, and reformulation of authorized federal <br /> <br />water projects to minimize salt contribution; <br /> <br />2. The three authorized salinity control projects described in <br />Chapter IV would be constructed in combination with implementation Of <br /> <br />the other salinity control measures identified in item 1 above; and <br /> <br />3. Twelve salinity control projects as described in Chapter IV <br /> <br />would be constructed in combination with implementation of the other <br /> <br /> <br />salinity control measures identified in item 1 above. <br /> <br />The salinity control projects consist essentially of those projects <br />described in Title II, Public Law 93-320, with some modifications as described <br />in Chapter IV. The initial year of operation of a particular salinity con- <br />trol project was determined after estimating the time required for planning, <br /> <br />authorization, and construction. The individual py'ojects and estimated year <br /> <br />of initial operation are described in Chapters IV and V. <br /> <br />The Basin states and federal agencies are investigating salinity control <br /> <br /> <br />measures other than those cited above and employed in the salt routing model <br /> <br />studies. For example, industrial use of saline water, implementation of <br /> <br />208 water quality management plans, potential reductions in salt loading from <br /> <br />13 <br /> <br />! ,I <br />"ib,,~ <br />