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Introduction Background Northern California Power Agency (NCPA) currently owns and operates the Combustion Turbine Project#2 (steam injected gas turbine [STIG] plant),an electrical generating plant located in the City of Lodi,San Joaquin County (Figure 1). NCPA is in the process of preparing an Application for Certification(AFC) for a second power plant,the Lodi Energy Center (LEC),to be located immediately adjacent to the STIG plant. The two power plants are located in a complex that also includes the City of Lodi s White Slough Water Pollution Control Facility (WPCF) to the east and the San Joaquin County Mosquito and Vector Control facility to the south (Figure 2). In this application,the existing and proposed power plant facilities will be referred to jointly as the STIG-LEC facility. The facility layout and well locations are shown in Figure 3. As part of its waste-disposal process,the STIG plant has owned and operated an onsite Class I injection well,referred to as STIG-1 U.S. Environmental Protection Agency ([EPA] Permit CA194000002,Appendix 1). STIG-1 was constructed in 1993 and has operated efficiently and effectively since routine operation began in 2000. Therefore, as part of the planned operation of the LEC facility,installation of a second Class I injection well will support the facility. In addition,a possible third well may be installed at a future date to serve as a back-up well for the two dedicated injection wells. This application addresses the permitting process for each of these wells: • STIG-1 reapplication • LEC-1 new installation application • LEC-2 (backup well) new installation application This application will consider the NCPA site injection of a total maximum of 425 gallons per minute (gpm) of disposal fluid into the Domengine Formation. The existing STIG-1 well is permitted to inject up to 200 gpm, although it has only injected, on average, 100 gpm. The planned injection rate of the LEC-1 well is 225 gpm. The backup well,LEC-2,would not operate above 225 gpm—it will serve as a backup well to either STIG-1 or LEC-1 at any given time,but will not back up both wells concurrently. Therefore,the maximum permitted injection rate at the NCPA site is 425 gpm. Plant Overview The STIG plant began operation in April of 19951. NCPA currently operates the STIG plant when electricity is needed during high demand periods. The STIG-1 well,therefore,only injects waste when the Combustion Turbine#2 (CT2) STIG plant is operational. The STIG plant injects a minimum of 20 percent of its wastewater. 1 Prior to the STIG-1 well beginning routine operation in 2000,wastewater generated at the STIG facility was returned to the White Slough WPCF. SAC/371322/082610010(INTRODUCTION.DOC) 1