Geo-Con, Inc.

Deep soil mixing shoring system to construct a 60 MGD, 40 foot deep wastewater pumping station

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Courtesy of Geo-Con, Inc.

The City of San Mateo, CA operates three wastewater pumping stations on a 80' wide lot located in a residential area near San Francisco Bay. The age of the stations range from 12 to 50 years, the stations have difficulty pumping peak wet weather flows, and have structural and maintenance problems. For these reasons, a new station was proposed to replace the existing stations. The site layout is shown in Figure 1. Flows through the existing stations are highly variable, averaging 10 MGD dry weather and approximately 50 MGD peak wet weather. At night flows drop to as low as 1 MGD. the new station was designed to pump peak flows of 60 MGD.

The new Dale Avenue Pumping Station that replaces the three exiting stations was originally conceived as a circular caisson type. However, a geotechnical investigation by Kaldveer Associates, Oakland CA, recommended against a caisson type structure because the stiff soils could cause difficulties in sinking caisson structure. This prompted an investigation of possible shoring methods for the proposed structure. This paper describes the shoring methods investigated, and the selection and fundamentals of the deep soil mixing (DSM) shoring system as well as construction considerations.

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