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<=> o 1".:> o Colorado River Basin Salinity Controi Program Measures In Place 800,000 600,000 , Ul 5 400,000 " I-'- o 200,000 , Figure 1-1 Overview of Standards The Forum proposed, the states adopted, and the EP A approved water quality standards in 1975, including numeric criteria and a plan of implementation, to control salinity increases. The standards require that a plan be developed which will maintain the flow-weighted average arumal salinity at or below the 1972 levels while the Basin states continue to develop their compact- apportioned water supply, The Forum selected three stations on the mainstem of the lower Colorado River as being appropriate points to measure the salinity ofthe Colorado River, These stations are located at the following points on the Colorado River; (1) below Hoover Dam; (2) below Parker Dam; and (3) at Imperial Dam. Numeric criteria were established for these points as required by the 1974 regulation, A plan of implementation was also developed in 1975 by the Forum and participating federal agencies as part of the standards, It was designed to ensure compliance with the numeric criteria for salinity, The numeric criteria and plan of implementation are further described in Chapters 3 and 4 of this Review, During each triennial review, the numeric criteria are reviewed and the plan of implementation is updated to ensure continuing compliance with the standards, The Colorado River water quality standards for salinity, and the approach taken by the Basin states in complying, are unique, The Forum relied on the Basin states' projections of use of compact- apportioned waters. The salinity projections are based on the long-term mean water supply of 15 million acre-feet per year, The plan of implementation is revised as necessary to ensure compliance with the standards, 1-4 . . .