Monday, March 16, 2009

Groundwater Treatment Facility, Where and Why

Groundwater treatment and water containment are important parts of this project. Water containment was anticipated during the project planning process. The EIR describes the South Shaft Area as being used for activities including “construction worker parking, offices in temporary trailers, equipment repair shop(s), materials storage, muck stockpiling, water containment structures, and equipment deliveries.”

As a reminder, SFPUC does not dictate means and methods the contractor should use. In this case, the contractor’s site layout resulted in the current upper level location of the water containment structures. The level of water in the treatment ponds will depend on the rate of inflow into project excavations and the time required for treatment prior to discharge. Of course, they will be removed at the end of the project.

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