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Show capacity. Therefore, it is estimated that an additional 20 c. f. s. of capacity would be adequate. This capacity should be provided by the independent systems. Table H- 2 summarizes the cost of developing the 18,000 acre- feet of groundwater annually with new facilities. New facilities to provide water to the west side of the valley would cost about $ 55 per acre- foot. Electrical costs of pumping groundwater would be about $ 7 per acre- foot. Therefore, water delivered to the west side would cost about $ 62 per acre- foot. These figures reflect the cost of replacing the depletions to flowing wells and the Jordan River caused by the additional development, but do not include the incurred costs of the Bonneville Unit. An alternative to full development of the groundwater would be to increase the standby capacity and reserve this source of high quality water for emergencies. In case of a major earthquake, drouth, radiation fallout, or other catastrophe which would eliminate or contaminate the base water supply, this water would be available to sustain life. If this water were reserved for such emergencies, additional water would need to be imported. ( b) Environmental Impacts of the Alternative I.- Salt Lake County In Salt Lake County the major impact of this alternative occurs to the groundwater system itself, because of system limitations. As previously mentioned, analog model studies have determined that the aquifer underlying eastern Salt Lake City would be dewatered before the year 2020 if the annual withdrawals increased to more than 200,000 acre- feet after 1968. Also, poor quality water from the Jordan River and areas west of the river could contaminate wells east of the river. Development to the 200,000 acre- foot level would occur with an additional T^ 9000 acre- feet of development above the present 126,000- acre- foot level, as ^ explained in Section B. The model studies were made assuming that development would occur uniformly over the entire existing well system. A portion of the development would be for additional low quality industrial water. However, 494 |