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<br /> <br />IN UPLY <br />una TO: 150 <br /> <br />the Interior ~^.... <br />--- <br />nON Ri.l;EIVED ' :.: ,':", Y/f!&J r.... <br />I!lS BEIWJI6I! OFFICIAL FIL~ copy <br />40 <br /> DEe 1.2 '82 <br />;~mgw(f lat. Ini~ial5 r" <br /> /->V <br />,/ -ocC 201982 <br />~~i.ORAD() W. ;:,', <br />O.cl;[.'?[IA"lcnr 'ATER <br />" "e~..lP.[ SOOo ' Corresp, <br />ty, Utah 0lIl e A""",i __._0"--- <br /> <br />'""An; <br />(';/ <br />,/ <br />Canyon <br /> <br />United States Department of <br />BURE~U ~F RECLAMA <br />WATER Ir'jNJBIPf)W R:I mOlil'ltOE <br />WASHINGTON, D.C. 202 <br /> <br />GLe-", C1 <br /> <br />r" 49 <br />t ,'. <br /> <br />DEe f <br /> <br />I' <br />-- <br /> <br />Memorandum C <br /> <br />To: ~gional Director, Salt Lake Ci <br /> <br />From: <br /> <br />Commissioner <br /> <br />Subj ect: <br /> <br />Uprating and Studies of Operational Alternatives--Glen <br />Powerplant--Colorado River Storage Project (CRSP) <br /> <br />We have reviewed the proposed final Environmental Assessment/Finding of <br />No Significant Impact (EA/FONSI) transmitted with your letter of <br />October 27, 1982. <br /> <br />While we concur with your analysis of the potential environmental <br />consequences of the proposed uprating and alternative courses of <br />action, any decision by you to initiate the uprating program should <br />take into account the following guidance: <br /> <br />" <br /> <br /><12 <br /> <br />1. The evidence presented indicates that the uprated <br />generators are still economically viable if used only during <br />maintenance activities or during emergencies and would provide <br />greater flexibility even without any changes in current operat- <br />ing criteria. Consequently, the additional plant capacity <br />resulting from the up rating will be restricted to present <br />maximum water releases (31,500 ft 3/s) from the powerplant. <br />This restriction on operation of the uprated generators will <br />remain in effect until a decision process, with appropriate <br />NEPA compliance, has been completed on a long-term operating <br />criteria for Glen Canyon Powerplant. <br /> <br />2. Studies will be undertaken on the current operation of <br />Glen Canyon Dam to see how the present flow patterns impact <br />upon the total riverine environment in the Grand Canyon and <br />how various low-flow periods affect rafting and the fisheries <br />resources in the river. We anticipate that these studies will <br />evaluate various low-flow patterns, such as, 1,000, 3,000, <br />4,000, 5,000, and/or 8,000 ft 3/s. We also anticipate that <br />you will evaluate fluctuating patterns as well as periodic high- <br />flow periods to see if there is a point where high flows <br />materially affect beach erosion, recreation, and fisheries. <br /> <br />f.JNrr <br />