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Chapter II Description of Alternatives 15 Operation and Maintenance Costs for Temperature Controls Fiscal Year Monitoring O&M Total 2000 $200,000 $100,000 $302,000 2001 $1,100,000 $100,000 $1,202,001 2002 $1,600,000 $100,000 $1,702,002 2003 $1,600,000 $100,000 $1,702,003 2004 $1,300,000 $100,000 $1,402,004 2005 $550,000 $100,000 $652,005 ALTERNATIVES CONSIDERED BUT ELIMINATED Navajo Powerplant Alternative - It was suggested that an alternative to selective withdrawal might be to use waste heat from the Navajo Powerplant. The powerplant currently uses cooling towers to condense their steam. In theory, the powerplant could be modified for flow-through cooling. Water discharged below the dam from a pipeline could be run through a generator(s) to reclaim the power lost (or plumbed into the existing turbine system). The energy produced from a 2,250 MW power plant would be about 810,000 kcaVs (360 kcalls-MW) and would warm 16,000 cfs by almost rc. This alternative would not warm the river sufficiently and would be extremely expensive due to the distances to be traversed. Hold the Reservoir at Minimum Pool - This alternative would hold the water surface at extremely low elevations so that penstocks could draw from the surface layer of the reservoir during the summer. This alternative would not allow Glen Canyon Dam to meet its statutory purposes. Power revenue losses to the government would exceed $100 million per year. Control of the release temperature would be difficult and would likely impact the downstream trout fishery. This alternative would also not allow the flexibility to quickly return to cold-water releases in case negative effects were seen downstream. Minimize Summer Releases to Increase Warming of the River - Extremely low summer releases might allow the river to warm more that under existing conditions; however, the loss in power production would likely far exceed the $1.2 million annual cost ($15 million capital cost) of the proposed temperature control alternative. Furthermore, cold-water releases from the dam would continue to be well below optimal for the Lees Ferry trout fishery and nutrient loading to the river would be far less than the temperature control alternative. Dam Removal- This alternative would likely restore natural temperature regimes to the river but may not help the recovery of endangered species because of the existence of non-native