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<br />'>i <br /> <br />. <br /> <br />. <br /> <br />September, 2005 <br /> <br />Attachment A <br /> <br />ASPINALL UNIT OPERATIONS <br />Consideration of Discretionary vs. Non-Discretionary Actions <br /> <br />LOCATION OPERATION BACKGROUND DISCRETION <br />A. Blue Mesa LEnd of December Based on studies and Yes <br />Dam target: 7490.0 feet or experience to minimize <br /> lower flooding due to icing <br /> upstream near the town <br /> of Gunnison, By verbal <br /> agreement, Reclamation <br /> has usually (but not <br /> always) operated for an <br /> end of December icing <br /> target of 7490.00 feet <br /> elevation since 1980. <br /> 2, Reservoir target 7517.4 feet is 2 feet from Yes <br /> fill: 7517.4 feet by top of spillway gate <br /> end of runoff season elevation 7519.4 feet <br /> (June-July) (official full pool). The 2 <br /> feet of elevation is a <br /> safety factor for <br /> controlling the reservoir <br /> in case of sudden flood <br /> events such as <br /> thunderstorms or very <br /> high snowmelt inflow, <br /> 3. Peaking Curecanti Unit, Yes <br /> operations: Releases Economic Justification <br /> have historically Report, April 1962 <br /> fluctuated between 0 <br /> and full powerplant <br /> capacity to meet <br /> variations in load <br /> requirements. <br /> 4. Maintain reservoir Maintain reservoir above Yes <br /> elevation to allow 7393 feet (top of inactive <br /> hydropower storage) <br /> operations <br /> 5. Option to draw While unlikely, Yes <br /> reservoir down to situations may develop <br /> dead pool if needed. requiring full nse of <br /> reservoir in a particular <br /> year. <br /> <br />II <br />