3.0 Project Description
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FINAL ENVIRONMENTAL IMPACT REPORT GRAYSON REPOWERING PROJECT PROJECT DESCRIPTION March 1, 2018 3.0 PROJECT DESCRIPTION The Repowering Project is a power plant repowering project that removes 238 megawatts (MW) gross (219 MW net) of existing old, inefficient, inflexible, and unreliable generation equipment that is past the end of its useful life, and replaces it with approximately 270 MW gross (262 MW net), state-of-the-art, efficient equipment that better fits the requirements and needs of the City. The Project is located within an industrial area of the City of Glendale, at 800 Air Way, Glendale, California 91201, just northeast of the Interstate 5 and Highway 134 interchange (Figures 2-1 and 2-2). The Project would be comprised of four natural-gas-fired electrical generating units, totaling approximately 262 MW net (at average annual site ambient conditions) and ancillary buildings and equipment to replace Units 1, 2, 3, 4, 5, 8A, and 8BC, at the City’s existing Grayson Power Plant within the City. An existing 48 MW (net) simple-cycle peaking unit (Unit 9) would not be removed, and would continue to operate during construction of the Repowering Project, and then be integrated into the overall Grayson Power Plant when the Project is completed. Simple- cycle units, discussed further in Section 3.1.5, consist of a gas turbine connected to an electric power generator. They are advantageous due to their operational flexibility and can be turned on quickly to provide peak load. The current total generating capacity at the Grayson Power Plant is 286 MW gross (267MW net). The Project would result in a Grayson Power Plant net generation capacity of 310 MW. Landfill gas generated at Scholl Canyon is currently being combusted in Grayson’s Units 3, 4, and 5 boilers. This landfill gas would no longer be transported to Grayson, and the pipeline would be decommissioned as part of the City’s proposed Biogas Renewable Generation Project at Scholl Canyon. Instead, landfill gas is proposed to be used to generate electricity at Scholl Canyon in a proposed 12 MW Biogas Renewable Generation Project or it would be flared off. The Repowering Project would consist of two independently operating simple-cycle natural-gas– fired combustion turbine power blocks, and two independently operating, one-on-one, combined-cycle natural-gas fired power blocks. Combined cycle units, discussed further in Section 3.1.6, utilize a combustion turbine generator to generate electricity while the waste heat from the combustion turbine is used to produce steam to generate additional electricity via a steam turbine. Each of the simple-cycle power blocks would consist of a Siemens SGT-A65 TR (Industrial Trent60) natural-gas-fired combustion turbine generator, emission control system, and ancillary equipment. Each would generate approximately 60 MW net at average annual site conditions. Each of the combined-cycle power blocks would consist of one Siemens SGT-800 natural-gas- fired combustion turbine generator, a NEM manufactured heat recovery steam generator, one Siemens SST-400 steam turbine generator, a recycled water cooled steam condenser, and 3.1 FINAL ENVIRONMENTAL IMPACT REPORT GRAYSON REPOWERING PROJECT PROJECT DESCRIPTION March 1, 2018 related ancillary equipment that would generate approximately 71 MW net of generation at average annual site conditions. Other equipment and facilities to be constructed and shared by the four power blocks include six natural gas compressors, a gas pressure control and metering station, two cooling towers, water treatment facilities, fire protection and emergency services, generator step-up transformers, other electrical switchgear and axillary transformers, a steam turbine generator building, and an operations and maintenance building. The Project would be constructed on approximately ten acres entirely within the footprint of the existing Grayson Power Plant and located within the City of Glendale’s Utility Operations Center. Project construction would require the demolition and removal of the existing Grayson Power Plant Units 1, 2, 3, 4, 5, 8A, and 8BC, their ancillary facilities, and the maintenance and operation buildings (Figure 2-3). Demolition and removal work is expected to take nine (9) months, and is scheduled to occur between the second quarter of 2018, and first quarter of 2019. Construction of the Project, which is depicted on Figure 2-4, is estimated to start after demolition is completed in the first quarter of 2019, and take approximately two (2) years with an additional six (6) months required for start-up and commissioning. Construction of the Project is expected to conclude by the fourth quarter of 2020, with commercial operation of the Project by the end of the second quarter of 2021. The Project would reuse existing off-site Linear Facilities, such as, natural gas, potable water, recycled water, stormwater discharge, processed wastewater discharge, and sanitary sewer pipelines, and electrical transmission lines that are currently serving the existing facilities. All interconnections from the Project are located entirely within the footprint of the existing City Utility Operations Center property boundaries (Figure 3-1). No off-site infrastructure development is necessary as part of the Project. The project would use recycled water for all plant operations except domestic use and would reduce the use of potable water provided by the City at the Grayson Power Plant. Potable water would, after completion of the Project, only be used for domestic use, eye wash stations, and fire protection. Although potable water would be used during construction, it would no longer be used for equipment cooling or process water purposes as a part of normal operation, eliminating the use of potable water currently being used for Unit 9 and any potable water used for the units that would be demolished. Wastewater, cooling tower blowdown and other process waste generated by the Project and Unit 9 would be treated as required and discharged into the existing sanitary sewer connection. This discharge would be conveyed back to the Los Angeles-Glendale Water Reclamation Plant, where it would be processed and again recycled to be made available for use at the Project site or at other facilities as recycled water for beneficial use. HRSG blowdown water would be recycled by sending it to the cooling towers and used as makeup water to reduce the Project’s water needs. 3.2 FINAL ENVIRONMENTAL IMPACT REPORT GRAYSON REPOWERING PROJECT PROJECT DESCRIPTION March 1, 2018 On-site stormwater runoff within the Project site would flow via surface sheet flow and localized gutters to catch basins and to on-site storm drain piping. The storm drain piping would be connected to an on-site collection and pretreatment and infiltration system to allow for infiltration for the design storm event as required by state and local agencies for treatment as further described below. During storm events, larger than the design storm, overflow runoff exceeding the capacity of the infiltration system would be discharged into the adjacent Verdugo Wash and Los Angeles River through existing stormwater outfalls. Stormwater that falls within process equipment containment areas would be collected separately from typical site runoff, treated, and discharged into the existing public sanitary sewer system as further described below. Preliminary grading and drainage plans for the Project are included in Appendix H, Hydrology, and Water Quality Technical Reports. Underground 69-kilovolt (kV) electrical interconnections would connect all four new units to the existing Kellogg Switchyard, which is located in the northeast corner of the Project and entirely within the footprint of the existing City Utility Operations Center property boundaries (Figure 3-1).. The only electrical interconnections from the Project will be at the existing Kellogg Switchyard. From the existing Kellogg Switchyard, power generated by the Project would interconnect to the GWP’s existing distribution system serving the City’s electric load. 3.3 Replace Section of Electrical Distribution Fire Water/Potable Manhole Tie-In Water Line Electric Distribution Communications Fire Water/Potable Tie-In to Airway Manhole Tie-In Water Tie-In Substation Natural Gas Tie-Ins ! ! Gas Meter Station Recycled Water TIe-Ins to Existing Underground Storage Tank ! Existing Waste Water Recycled Wate Tie-In Sewer Manhole Storm Drain To Water Treatment Tie-In Electrical Distribution Tie-In to Kellogg Substation Fire Water/Potable Storm Drain Water Tie-In Tie-In Existing Water Well Storm Drain Storm Wate Tie-In Tie-In Sanitary Sewer Tie-In Recycled Water Tie-In To Cooling Towers ± Griffith Park 0 100 200 Existing Firewater/Potable Water to Site Feet Existing Natural Gas to Site 0 25 50 Existing Recycled Water to Site Meters Existing Sanitary Sewer from Site STANTEC CONSULTING CITY OF GLENDALE Date: 7/7/2017 Existing Storm Drain from Site m Prepared by: HS a h y u 2 b 0 z 1 DEPARTMENT OF WATER AND POWER w 5 u SERVICES Inc. t z o a h p e r re il 2 Existing Waster Water Sewer from Site 0 1 6 PROPOSED GRAYSON REPOWERING PROJECT 5500 Ming Avenue, Suite 300 FIGURE Bakersfield, California 93309 ENVIRONMENTAL IMPACT REPORT Phone: (661) 617-5873 Fax: (661) 396-3771 UTILITY CONNECTIONS NO. 3-1 Existing Well Water to Site FINAL ENVIRONMENTAL IMPACT REPORT GRAYSON REPOWERING PROJECT PROJECT DESCRIPTION March 1, 2018 The existing facilities at the Grayson Power Plant and those that would be present after implementation of the Project are