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. . N CJ1 -..1 ,.,I:;l. 1989 Annual Progress Report Water Quality Standards for Salinity Colorado River System March 1990 Prepared by the Colorado River Basin Salinity Control Forum Introduction In 1975, the seven-state Colorado River Basin Salinity Control Forum (Forum) prepared a report which included numeric criteria and a plan of implementation and recommended that each state adopt the report as its Colorado River Basin salinity standards. Each of the Colorado River Basin states adopted the recommended standards which were approved by the Environmental Protection Agency (EPA) in November 1976. The Clean Water Act requires that water quality standards be reviewed at least once each three-year period. Accordingly, in 1978, 1981, 1984 and again in 1987 the Forum reviewed the existing state-adopted and EPA approved salinity standards. Based on the 1987 review, the Forum found no reason to recommend changes in the numeric criteria. The plan of implementation requires that the Forum's permanent Work Group analyze the progress and results of the salinity control program as well as other actions in the Basin which impact on the river's salinity. In addition, the states, through the Forum, have agreed to submit an annual report to the Environmental Protection Agency and to state water resource and pollution control agencies summarizing the results achieved by the salinity control program and the effect of other actions in the Basin having an influence on salinity. This report covers the period October 1, 1988 September 30, 1989. Water Supply The natural (undepleted-unregulated) flow at Lee Ferry, as determined by the U.S. Bureau of Reclamation (Reclamation) for the water years 1973 through 1988 is shown on Table 1.