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5.15 WATER RESOURCES 5.15.1.4.2 Domestic and Sanitary Water Use Potable water will be used for eye-wash stations and sanitary facilities (as needed). The LEC will use a minimal amount of potable water (approximately 450 gallons per day,Monday through Friday,and 90 gallons per day,Saturday and Sunday). The LEC will obtain its potable water from an onsite groundwater well,which will be constructed as part of the project. 5.15.1.4.3 Water Supply during Construction Construction of the LEC project is scheduled to last 24 months. The entire 4.4-acre project site will be graded during construction. There are four proposed laydown and parking areas ranging from approximately 1.6 to 3.1 acres each (Figure 2.1-3).During construction of the project,water will be required primarily for dust suppression (12 hours per day for approximately 24 months). Construction activities would require a relatively limited amount of water (an average of approximately 50 gpm and approximately 200 gpm for 1 hour for dust control and soil compaction, at peak use). The construction water supply will come from the WPCF. The average daily water use for construction would be 36,000 gallons per day and daily maximum water use would be 144,000 gallons per day. The average annual water use for construction would be 13.14 million gallons per year (maximum annual water use would be 52.56 million gallons per year). 5.15.1.5 Wastewater Collection, Treatment, Discharge and Disposal Wastewater from the LEC will be discharged directly to an onsite Class I underground injection well that will be constructed as part of the project. As backup,the LEC site would use the existing injection well in place for the STIG plant. The LEC would discharge up to a maximum of 225 gallons per minute of process wastewater that would be injected into the well. A Class I underground injection well permit package will be submitted to the U.S. Environmental Protection Agency (EPA) Region IX,Water Department. A copy of the permit package will be provided at a later date. The permit package will include three well permits: • A permit for a new Class I underground injection well to be built for the LEC plant • An updated application for the existing (and currently permitted) Class I underground injection well at the STIG plant,which will be used as backup for the LEC project • A new Class I underground injection well to be used as a backup for both the STIG and LEC plant. This well will not be constructed at the same time as the LEC project,but will be permitted in the event the construction of the well becomes necessary in the future. Table 5.15-8 shows the expected water quality from the LEC project based on the preliminary modeling conducted by NCPA. A zero liquid discharge system (ZLD) will not be used for the LEC. The plant washwater from the equipment drains will pass through an oil-water separator and wastewater sump before it is discharged to the atmosphere through evaporation in the cooling tower. The oil and sludge removed from the washwater will be disposed of offsite. Wastewater from the safety showers and eye wash will also be discharged to the atmosphere through evaporation in the cooling tower.Sanitary wastewater will be minimal and will be discharged to the WPCF. A will-serve letter from the City of Lodi indicating that receiving domestic waste from the LEC would be acceptable is included in Appendix 2D. 5.15-16 SAC/3713221082340005(LEC_5.15_WATER_RESOURCES.DOC)