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SFPUC presents preferred plan to extend AWSS to Sunset and Richmond, estimates $109 million cost
Summary
SFPUC officials told the Fire Commission they recommend a potable Auxiliary Water Supply System (AWSS) extension (option 12) to serve the Sunset and Richmond districts, estimating roughly $109 million in capital costs with a $70 million shortfall after $40 million already committed by SFPUC.
John Scarpulla, manager of government affairs for the San Francisco Public Utilities Commission, told the Fire Commission on March 14 that engineers now recommend a potable AWSS network to provide both firefighting capacity and potable water resilience for the city’s West Side.
“We started at 47% in 2010. By 2020 or so, we’re gonna be at 87%,” Scarpulla said, describing modeling of a 7.8–7.9 earthquake scenario and a decade of work to upgrade reservoirs, pumps and pipelines that feed the AWSS. He said the potable AWSS would be built to drinking-water standards so, after firefighting, it could restore potable water to Sunset and Richmond neighborhoods even if the low-pressure city system had multiple breaks.
The SFPUC contracted an analysis of 12 options with AECOM. Of those, two…
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