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Ground Stabilization Allows for Expansion in Flood Plain

The Ironhouse Sanitary District wastewater-treatment plant serving parts of Contra Costa County in Northern Calif. is approaching capacity and requires expansion to meet demand. But the land allocated for a new plant is within the 100-year flood plain with high groundwater, compressible soils, and liquefaction potential.

A subsurface investigation revealed that the upper 14 to 18 ft of soil underlying the site consisted of medium stiff to soft clay with localized weak compressible soils and loose to medium dense sands.  Below  that is medium dense to very dense sands and stiff  to hard clay.  Groundwater was present  two to four feet below the surface, and there is seismic potential. 

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