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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />refined shale oil is estimated tQEiQJbire 27,000 acre-feet <br />of water per year for municipal and industrial use of which <br />11,000 acre-feet would be returned to the stream. Tables <br />3 and 4 give supporting data. These figures are inclusive <br />of any water diverted for use during Phase II. <br />Since a basic assumption is that all th~ shale oil will <br />be refined in the area, the estimate of water use probably <br />is maximum for this oil production quantity. For planning <br />water supplies it is suggested that a factor of 1.5 be used <br />to cover errors in estimation and larger production quanti- <br />ties than assumed. Applying a factor of 1.5, the water <br />supply capability for Phase III should be 40,000 acre-feet <br />per year. <br />Water Requirement for Phase IV <br />From Tables 3 and 4 it may be seen that estimated water <br />use for the production of 1,250,000 barrels of refined shale <br />oil per day is 252,000 acre-feet of which 93,000 acre-feet <br />would be returned. These figures are for industrial and <br />municipal use for both shale oil production and shale-related <br />industry. Usage is inclusive of that estimated for previous <br />phases of development. All shale oil is assumed to be re- <br />fined in the area, thus water use should be maximum for the <br />oil quantity assumed. <br />For planning water supplies, we suggest taking the water <br />usage estimated without application of a factor to account for <br />errors. The period in question is sufficiently far in advance <br />to allow reappraisal when the actual pattern of development <br />becomes evident. Our current recommendation for a water <br />-31- <br />