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1\) Ul UI Co..> (Continued from pag$ 1.) tons of salt annually from the river system. Projections of future salinity conditions used 'he average of 15 sequencell of histori- cal hydrology (1906-19aB) as a data base and current (1987) depletion projections de~eloped jointly by Reclamation a/1d the Forum. ' The salinity at Imperial Dam Is projected to reach aboul960 mg/L by the year 2010, Flgur$ f provides an historical perspective In addition to the numeric stand- ard and the projections at Imperial Dam, It Is readily appar4nt that without the recommenddd con- trols, the salinity at Imperial Dam Is expected to Increase ~lgnWI- cantly over the next elghl years due In part to expected normal hydrologic conditions. l):slng the salinity projections at ImlPerlal Dam, salt load reductlon~ reCijulred to reduce projected TDS I(totlll dis- solved solids) levels to tHe numeric criteria of p 879 /ng/L are estimated to be about 1 million tons per year by the yeari 201 0 and Is referred to as the ~rogram objective, Figure 1 also ~hows how the Implementation ~Ian meets the numeric crlterl~, MAJOR FINDINGS The recommended plaa Is expected to fully satisfy s$lt IQad , reduction objectives and @rOl:lram goals, maintaining sallnlty;levels at Imperial Dam at or below 1179 mg/L. The recommendedl plan's Implementation schedule Is sllown on table 1, .. This analysis Is based on cur- rent data (January 1987), 'Annual review Is required to update project data, check progr4ss against program objective!!, and ,i: ,; S a I I n I t Y Salinity Projections at Imperial Dam with and without further controls 1 r 'I 1000 950 900 850 800 750 700 650 600 550 1941 Standard ProJeotlons /l;):' .:.:." f'....'" \ \! II I' 11\\I'./?~I~~orl:~~'~\!J\\ {((~S~C:~s _.,III\-,! ........ . ....111 'i " /~\\ i/ \\ ,!!~l/ .;' \\/~~/ \ \- - // - ,\., / '\'.' \-'7*, , '" 11'1 g / L 50 '* Provisional thru N"ovember 70 60 Years 60 90 00 2010 Fig 1, Salinity projections with & without further controls validate that Investment level assumptions of approximately $560 million will satisfy program objectives. As evidenced by past . pro- gram activities, long lead times are required for project plan- ning and Implementation, and con- struction costs will continue to Increase. To minimize program costs and to avoid Increased Infla- tion expenses, program planning, Implementation schedules, and funding levels should be consis- tent with the recommended plan, Although high flows for the past few years have temporarily lowered salinity levels In the sys- tem, construction should not be delayed, Any delay would Impact . . program continuity and Increase overall program costs, . maintaining salinity at or . below 879 mg/L at Imperial Dam, . Total remaining construction. cost for tile program Is now projected to be about $560 million. . In order to meet the program objectives and goals beyond the next decade, to minimize Lower Basin Interest costs, and to maintain program con- tinuity, construction of several new projects as specifier;! In the Implementa- tion plan needs to be Initiated In the next 4 year$. The $560 million Investment level appears to Qest satisfy the remaining long-term requirements at least Invest- . ment costs, f ;l . The recommended plan will fully satisfy the remaining salt load reduction objective of removing about 1 million tons per year by 2010 and the program goal of . To meet salt load reduction objectives, It Is necessary to 2 , i-i:...'" ,.;L. ';;,-.;;:>.L