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  • Transbay Transit Center


    Salesforce Transit Center (during planning and construction known as the Transbay Transit Center) is an intermodal transit station in downtown San Francisco. It serves as the primary bus terminal — and future rail terminal — for the San Francisco Bay Area. The centerpiece of the San Francisco Transbay development, the construction is governed by the Transbay Joint Powers Authority (TJPA). The -long building is located one block south of Market Street, San Francisco's primary commercial and transportation artery. Construction of the new terminal was necessitated by the 1989 Loma Prieta earthquake, which damaged the 1939-opened Transbay Terminal, and voters approved funds for the new Transbay Transit Center in 1999. Construction on the first phase, the aboveground bus terminal, began in 2010. Limited Muni bus service began in December 2017, and full service from AC Transit and other regional bus operators began in August 2018. Full funding has not yet been secured for the second phase of construction, the Downtown Rail Extension, which will add an underground terminal station for Caltrain and California High-Speed Rail.

  • Electrical grid


    General layout of electricity networks. Voltages and depictions of electrical lines are typical for Germany and other European systems. An electrical grid is an interconnected network for delivering electricity from producers to consumers. It consists of Generating stations that produce electrical power high voltage transmission lines that carry power from distant sources to demand centers Distribution lines that connect individual customers.Power stations may be located near a fuel source, at a dam site (to take advantage of renewable energy sources), and are often located away from heavily populated areas. The electric power which is generated is stepped up to a higher voltage at which it connects to the electric power transmission net. The bulk power transmission network will move the power long distances, sometimes across international boundaries, until it reaches its wholesale customer (usually the company that owns the local electric power distribution network). On arrival at a substation, the power will be stepped down from a transmission level voltage to a distribution level voltage. As it exits the substation, it enters the distribution wiring.

  • Refrigerant reclamation


    Refrigerant reclamation is the act of processing used refrigerant gas which has previously been used in some type of refrigeration loop such that it meets specifications for new refrigerant gas. In the United States, the Clean Air Act of 1990 requires that used refrigerant be processed by a certified reclaimer, which must be licensed by the United States Environmental Protection Agency (EPA), and the material must be recovered and delivered to the reclaimer by EPA-certified technicians.

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