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Show 123 peak stage in 1975. A 500- foot opening would cause the South Arm elevation to be .3 feet lower than without the opening. Salinity in the South Arm would increase from 145 grams per liter of dissolved solids to 162 by about June, 1975, with the 200- foot opening while a 500- foot opening would increase the mineral content of the brines to 184 grams per liter, which is a substantial increase beneficial to South Arm extractive industries. The above figures are based upon water inflows to the Great Salt Lake of 1.78 million acre- feet of water from October, 1974, to October, 1975, which is just above the average 1.6 million acre- feet of inflow. Comparable figures for water inflows of 2.97 million acre- feet ( actual 1972 inflow) and for 3.41 million acre- feet are included in the table. Corresponding data for the North Arm is also included. Table 25 indicates the percent increase or decrease in production of Lake industries from 1973 to 1975 various sized openings had been made. The table also shows that, even under existing causeway conditions, all three water inflows considered would create production increases or decreases. This situation is especially significant for the two large chemical plants and should be carefully noted. Table 25 also shows that a 200- foot opening would reduce potash production in the North Arm by one percent and salt production by an estimated three percent. The same opening would increase magnesium production in the South Arm by approximately 4 percent and salt production by 15 percent. A 500- foot opening would cause potash production in the North Arm to decrease 6 percent and salt production to decrease 15 percent. On the other side of the causeway, salt production would increase approximately 40 percent and magnesium production 7 percent. The above figures assume |