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<br />xvi <br /> <br /> <br />W <br />f\:l <br />00 <br />~ Construction of the water system improvement projects would involve <br /> <br />periods of 4 to 5 years. Most of this work could be completed by <br /> <br />fiscal year 1981. Of the point source control projects, LaVerkin <br /> <br />Springs, Crystal Geyser, Littlefield Springs, and Paradox Valley <br /> <br />could be constructed in a period of 3 to 4 years. On this basis, <br /> <br />construction could be completed during fiscal year 1980. Blue Springs <br /> <br />and Glenwood-Dotsero Springs will involve consideration of many com- <br /> <br />plex factors regarding the engineering plan and related environmental <br /> <br />and social considerations. Construction, even if found feasible in <br /> <br />all respects, could not be started before 1978 on Glenwood-Dotsero <br /> <br />Springs and 1980 on Blue Springs. The lack of data on the diffuse <br /> <br />source control projects could delay construction starts until fiscal <br /> <br />year 1979 or later. <br /> <br />The Effects of Programs <br /> <br />The average annual salinity concentration of the Colorado River at <br /> <br />Imperial Dam during the period 1941 to 1968 (most recently published <br /> <br />data) was 751 mg/l. The annual salinity concentrations during this <br /> <br />same period have ranged from a minimum of 649 mg/l in 1949 to a max- <br />imum of 918 mg/l in 1956. The monthly salinity concentrations of the <br />Colorado River at Imperial Dam during the period 1941 to 1968 have <br /> <br />experienced an even wider range from a miniJIU.\JJl of 551 mg/l in December <br /> <br />1952 to a maximum of 1,000 mg/l in January 1957. <br />