GEI, in coordination with CH2M Hill and Structural Integrity Associates (SIA), conducted a condition assessment of Moccasin and Holm Penstocks for the Hetch Hetch Water and Power System (HHWP). Along with providing hydro power, the Moccasin penstocks are a critical “lifeline” component of the city of San Francisco’s municipal water delivery system. The Moccasin penstocks (2 to 4 parallel pipes) extend approximately 5,000 feet f

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