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2021-086 El Portal Market Generator and HVAC (CFF 2021)

Yosemite National Park » 2021-086 El Portal Market Generator and HVAC (CFF 2021) » Document List

The El Portal Market is a year-round concessioner-operated facility in El Portal, California within the administrative site for Yosemite National Park. It is the only grocery store in the area and provides valuable service to the local community and park visitors.

The current ducted heating, ventilation, and air conditioning (HVAC) system has reached the end of its useful life and it is necessary to install a more reliable and energy-efficient system. The scope of work is proposed to include the following:
• Recover refrigerant gas and demo and remove (3) existing air conditioning units, including duct, duct insulation, dampers, registers, grilles, refrigerant piping, pipe insulation, associated hardware and hangers, and electrical system to existing HVAC system
• Install (1) new variable refrigerant flow condensing unit, (1) new branch circuit controller unit, (1) new ceiling cassette unit, copper refrigerant piping, pipe insulation, aluminum jacket, hanger, and associated hardware
• Install (4) new ducted fan coil units and (1) new energy recovery ventilator unit, duct, duct insulation, dampers, registers, grilles, copper refrigerant, piping, pipe insulation, hanger and associated hardware
• Install (5) new copper condensate drains, hanger and associated hardware to new fan coils
• Install thermostats
• Install associated electrical to new variable refrigerant flow system
• Complete necessary drywall and siding patching and paint touch-ups

A permanent backup generator is required to keep the market functional during power outages. El Portal is subject to frequent and prolonged power outages caused by weather, wildfire, and public safety power shutoffs by PG&E (the local utility company) when high winds and potential wildfires are predicted. The town of El Portal is also frequently isolated by road closures caused by weather, rockfall, wildfire, and floods, which can strand residents and visitors for days at a time.

The project will provide and construct all necessary components and connections to provide full standby power to the electrical loads at the market. It will include an 125 KW propane generator with weather proof and sound attenuated enclosure; an above ground 1000 gallon propane tank; 80 feet of trenching for electrical conduits and propane fuel lines; wire and terminations to connect to the existing manual transfer switch, generator, and propane tank foundations. The work will occur on the north side of the building (see enclosures 1: project/APE maps and 2: photos). The scope of the generator work is proposed to include the following:
• Demo of Existing Manual Transfer Switch and Tap box
• Install of new 125 KW Propane power generator and new 400 amp automatic transfer switch
• Install grounding for new generator
• Block heater and Battery charger circuits to generator
• Install underground gas piping from propane tank to generator complete with regulators and flexible connection requiring 80-feet of trenching measuring 18-inches wide by 24-inches deep
• Install a 6" Concrete Slab for Generator requiring very minor leveling of an area measuring 10-feet by 6-feet