ARCHIVED REPORTS LEC APPLICATION FOR CERTIFICATION

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SECTION 2.0:PROJECT DESCRIPTION 2.1.10.1 Water Requirements On an annual average basis,recycled water use would be about 856 gallons per minute (gpm) or 1,380 acre-feet per year (afy), assuming full-time operation at 8,760 hours per year (Table 2.1-2). Water used for makeup in the circulating water system will be treated using a cold lime softener and a microfiltration unit before being fed into the cooling tower collection basin. The micro-filtration feed water storage tank and the micro-filtration product water storage tank will provide approximately 2 hours of operational storage in the event there is a disruption in the supply. Water supply reliability is ensured by the WPCF's recycled water storage capabilities. There will be approximately 5 cycles of concentration of the reclaimed water through the cooling system before being discharged to the UIW. TABLE 2.1-2 Estimated Daily and Annual Water Use for LEC Operations,"Rapid Response"GE Energy Frame 7FA Natural Gas-fired Turbine Generator Maximum Annual Daily Use Maximum Daily Use Water Use (gpm) Use(mgpd) (afy) Process and cooling water: Average annual 856 1.23 1,381 (unfired) Maximum annual 1,528 2.2 2,464 (fired) Sanitary and domestic water: 5 50 8.1 aFor the GE 7FA values using other operating scenarios,see Appendix 2A. bThis assumes full-time operation all year(8,760 hours),which is the maximum operation possible; however,the facility will be periodically taken out of operation for maintenance and will not operate all the time. 2.1.10.2 Water Treatment Water treatment will be provided on site using reverse osmosis (RO) and demineralizer systems. High-purity water will be stored in an approximately 200,000-gallon demineralized water storage tank.Water quality is described further in Section 5.15,Water Resources. 2.1.10.3 Cooling Tower System Makeup water from the WPCF will be pre-treated prior to feeding the cooling tower basins to replace water lost from evaporation, drift,and blowdown. A chemical feed system will supply water-conditioning chemicals to the circulating water to minimize corrosion and control the formation of mineral scale and biofouling. Sulfuric acid will be fed into the circulating water system to maintain a target pH to control the scaling tendency of the circulating water. The acid feed equipment will consist of a bulk sulfuric acid storage tank and full-capacity sulfuric acid metering pumps. To further inhibit scale formation,a polyacrylate solution will be fed into the circulating water system as a sequestering agent in an amount proportional to the circulating water blowdown flow. The scale inhibitor feed equipment will consist of a chemical solution bulk storage tank and two full-capacity scale inhibitor metering pumps. 2-22 SAC/371322/082340003(LEC_2.0_PROJECT_DESC.DOC)