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O <br />s <br />Volume III - Comments and Responses <br />FEIS - Navajo Reservoir Operations <br />Horn Canyon Pumping Plant and Pipeline - construction and OM&R' costs ($ million) <br />Pumping Inlet to Total Total annual <br />Facility plant and NIIP capital Annualized Annual costs <br />size intake Pipeline Canal cost capital costs OM&R (50 yrs @ 5.875%) <br />250 cfs $72.0 $22.0 $1.0 $95.0 $5.9 $0.628 $6.50 <br />100 cfs $51.0 $14.0 $0.5 $65.5 $4.1 $0.282 $4.40 <br />' Operation, maintenance, and replacement. <br />Storage Project (CRSP) power is available to the NI1P system and was used for <br />estimating pumping power costs for this analysis. The estimated annual cost for <br />O&M is approximately $628,000 for the 250 cfs option and $282,000 for the 100 cfs <br />option. <br />Increasing minimum river releases from 250 cfs to 500 cfs during the irrigation <br />season from April through October would benefit the trout fishery, normal <br />operation of diversion structures that are affected by river elevations, and the <br />hydropower plant at Navajo Dam. In'addition, there would be no effect to <br />reservoir content, and there would be no change to the riverflow below this <br />proposed plant. <br />This system would not be used on a continuous basis. For example, it would be <br />activated when dam releases drop below 450 cfs, which, according to hydrology <br />modeling, would occur 37 percent of the time on an annual basis. <br />Projected economic impacts to the local economy of $1.83 to $6.16 million per year <br />stemming from trout habitat losses as a result of 250 cfs releases during the <br />irrigation season would be eliminated. <br />As a result of increasing the minimum releases out of Navajo Dam from 250 cfs to <br />500 cfs, hydropower generation impacts to the City of Farmington would be <br />reduced from an annual average of $5.3 to $7 million to the estimated loss of <br />$3.2 million annually. This amounts to a reduction or savings in annual impacts of <br />between $2.1 to $3.8 million for the City of Farmington resulting from the <br />construction of a pumping plant and pipeline at Horn Canyon. <br />Private diversion structure annual maintenance would be reduced from an <br />estimated $14,000 under the 250/5000 Preferred Alternative to $7,000 under the <br />500/5000 Alternative-a savings of $7,000 to entities operating water diversion <br />structures.