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Spill Prevention, Control and Countermeasure Plan Tesla Treatment Facility Page 9 of 45 the SJPLs terminate. From there, the pipeline water is diverted to the Tesla Treatment Facility where the water is treated at the ultraviolet light (UV) facility. The water also receives chlorination, pH adjustment and fluoridation. After treatment, the water enters the Coast Range Tunnel, a 26-mile long tunnel that ends at the Alameda East Portal in Sunol Valley(SFPUC, July 2011). The Tesla Treatment Facility has a state-of-the-art UV treatment facility housed in a reinforced concrete building of 20,000 square feet (sq. ft.). The UV Building includes twelve (12) Calgon Sentinel Chevron UV reactors each of 48-inch diameter and 51 million gallons per day (mgd) capacity. The facility has two (2) UV reactors on standby, as well as cleaning and ancillary equipment. The advanced disinfection of waterborne pathogens by UV adds another level of protection to the water quality of the Hetch Hetchy source water before distribution to end users in the San Francisco Bay Area(SFPUC, July 2011). Figure A-4.1 in Appendix A is a detail plan view of the UV treatment facility. In addition, the Tesla Treatment Facility includes a Chemical Building of 10,000 sq. ft. where sodium hypochlorite and hydrofluosilicic acid are stored and used for chlorination,pH adjustment and fluoridation; two (2) outdoor carbon dioxide storage tanks and carbon dioxide loading area; an Operations Building of 4,000 sq. ft. that adjoins the UV Building and includes office space, a control room, and a laboratory; an Electrical Building with an oil-filled substation transformer; three (3) 1,200 kilovolt-amp (kVa) flywheel-type Uninterrupted Power Supply (UPS) systems designed to maintain the integrity of the facility; and an Emergency Power Generation Facility with two (2) standby power generators each of 1.5 megawatt (MW) capacity and two (2) aboveground diesel storage tanks each of 8,000-gallons capacity(SFPUC, July 2011). The facility features isolation valves and piping to divert water flow from the SJPLs into the UV treatment facility, large-diameter piping and valves within the facility, and a single discharge pipeline to tie-back into existing pipelines after treatment. The existing facility replaces the functions of the 75-year-old Tesla Portal Disinfection Facility, which no longer meets present-day fire or earthquake safety standards (SFPUC, July 2011). Plan views of the Operations Building and Chemical Storage Building are presented in Figure A- 4.1 and Figure A-4.2, respectively, in Appendix A. The Tesla Treatment Facility is one of more than 80 projects that form part of SFPUC's$4.6 billion Water System Improvement Program(WSIP), launched in 2002 to repair, replace and seismically retrofit aging infrastructure in the Hetch Hetchy System. The design-build team began facility design and equipment procurement for the Tesla Treatment Facility in 2008, and construction was completed and facilities placed into full operation in 2011 (SFPUC, July 2011).