SITE INFORMATION AND CORRESPONDENCE

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5.15 WATER RESOURCES approximately 10 feet annually (City of Lodi,2006). Groundwater elevation in the vicinity of the LEC project site is also affected by local groundwater pumping.Figure 5.15-3 shows all wells within 1 mile of the LEC project site. The primary use of groundwater in the area is agricultural. Substantial groundwater recharge occurs in the vicinity of the LEC project site. Sources of groundwater recharge in the area include irrigation of Delta lands and seepage from related Delta waterways to the west,surface-water-irrigated lands to the north and east,percolation from WPCF storage ponds,and recharge from WPCF land application areas (City of Lodi, 2006). 5.15.1.3 Flooding Potential The project site is in the 100-year flood plain(Zone A) as defined by the Federal Emergency Management Agency (FEMA;Figure 5.15-4) (FEMA,2002).The potential for a 100-year flood event to impact the site is medium to high. Although the LEC project area is protected by levees,many of the Delta levees are unstable and may fail during severe storms. 5.15.1.4 Water Supply This section describes the quantity of water required,the sources of the water supply, and water treatment requirements. 5.15.1.4.1 Process Water The LEC project will connect with the WPCF for supplies of recycled water for cooling through an existing 48-inch diameter pipeline in the utility corridor connecting the LEC and the WPCF. Table 5.15-6 shows the expected water quality of the LEC source water from the WPCF. Incoming recycled water will be stored in the raw water tank. Recycled water from the raw water tank will be available for the fire water system. Untreated recycled water will be used for plant washwater. Due to the high level of reliability of water from the WPCF,no backup water supply is required or planned for this project at this time. Part of the incoming recycled water from the WPCF will be treated by a demineralization system and then stored in a demineralized water storage tank. The tank would be sized for 20,000 gallons,which is nominally 4.6 days of plant demineralized water usage, of back-up water supply. This water will be used in the heat recovery steam generator (HSRG) feedwater and condensate system for turbine water wash and combustion turbine inlet air cooling. Demineralized water for the HSRG feedwater and condensate system will be treated by a cold lime softener clarifier and a micro-filtration system before going through the demineralization process. Figure 2.1-5A shows the water balance for the LEC project (the water balance calculations are provided in Appendix 2A). The demineralization system would include first and second pass reverse osmosis (RO) and electro-deionization. As shown in Table 5.15-7,the LEC's average daily water use would be approximately 1.23 million gallons per day (24-hour period). Maximum daily use would be 2.2 million gallons per day during the summer (fired) condition. A will-serve letter from the City of Lodi indicating that a sufficient amount of recycled water will be available to the project is included in Appendix 2D. Based on a 70 to 80 percent capacity factor (approximately 7,000 hours of operation per year),the LEC would use an average of 1,103 acre-feet (359.52 million gallons) per year of water. 5.15-10 SAC/3713221082340005(LEC_5.15_WATER_RESOURCES.DOC)