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? ':', )': ~ , '.",' ":': ,~' ~~! ':1 -',,, '.;-;: 1 "', ,:;. ~' :: ,!,' .'." '~,:, ~~;:'>.,~ ,+,' '~ -"~ , .~ ,';' ,,' ~:~; / I ;f: f;~_ N <.c "J" N o Co Section 5 ECONOMIC COMPARISON OF WATER TREATMENT PROCESS OPTIONS Economic comparisons of the five water treatment process options were developed on a basis of January, 1986 dollars and economic factors provided by Nevada Power Company. EQUIPMENT COST ESTIMATES Appraisal level cost estimates, with an accuracy of plus or minus 25%, were developed for the five selected process options. These costs include equip- ment, engineering, and installation and construction. Engineering cost is es- timated at 20% of the equipment cost. Installation and construction cost is estimated as 1.75 times the equipment cost for each option. Equipment cost estimates assume complete installation Including site preparation, piping, electrical, controls and Instrumentation. The circulating water system design for al I options assumes the use of titanium condenser tubes and sulfate resistant concrete for cool ing tower basins and I inlng of circulating water piping. An additional equipment cost increase of $2,000,000 was added to Options I, II and I II to account for higher quality materials required for corrosion protection in the cool ing towers and in the auxiliary cooling systems. Evaporation pond costs are estimated at $125,000 per acre assuming single high density polyethylene membrane lining and an underdraln and monitoring system. This cost is based on recent evaporation pond design and construction ex- periences at other western power plants. The actual cost of evaporation ponds wll I be subject to Site-specific evaluations of geologic conditions and lo- cally available alternative lining materials. EquIpment cost estimates assume complete Installation includIng piping, electrical, controls and instrumentation. Option I (LV) - Ix Softening/Sidestream Softening/VCE/Evaporation Ponds The battery I imits for the ion exchange softening system include the raw water Inlet to the Ion exchange softening system, the discharge to the cooling tower basins, the wastewater surge pond and the evaporation ponds. The boundaries of the wastewater treatment system include the surge pond Inlet, the makeup points to the condensate system, the ash and the FGD systems, and the evapora- tion ponds. Water system equipment for the Option I cost estimate includes: . Eighteen 10 foot diameter by 15 foot hIgh I ined ion exchange sof- tener vessels, tanks for Ion exchange regenerant and rinse . One 3,500,000 gallon membrane I ined collection basin with three 9,000 gpm pumps 5-1 ~- ,.~