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Figure 1-1 displays a cumulative estimation of the annual salt removal by the Colorado River BasinSalinity Control Program. o 1'0 l\j CO Colorado River Basin Salinity Control Program 1,000,000 800,000 8 600,000 E-< 400,000 200,000 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 Year Figure 1-1. Measures in Place Overview of Standards In 1975, the Forum proposed, the states adopted, and the EPA approved water quality standards, which included numeric criteria and a Plan of Implementation to control salinity increases in the River. The standards require that a pllm be developed which will maintain the flow-weighted average annual 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 of the 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 Forum relies 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 (mat) per year at Lee Ferry, Arizona. 1-4