Secondary Clarifier Upgrades in San Francisco Client: San Francisco Public Utilities Commission Location: San Francisco, CA As the sixteen secondary clariers at the San Francisco Public Utilities Commission (SFPUC) Wastewater Enterprise Southeast Plant (SEP) were reaching the end of their useful life, SFPUC retained Hazen and Sawyer to assist in planning and designing the clarier upgrades.Hazen, as an owner’s representative throughout the procurement and construction phase, worked with the construction manager, contractor and the clarier manufacturer to build consensus on clarier features and a testing plan. Project Outcomes and Benefits Full process evaluation of the existing clariers that included clarier stress testing, sludge zone settling tests, occulation testing and dispers

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