' Owner: City of Roberts, Idaho ' General Contractor: TBP Construction ' Technique(s): Vibro Stone Columns ' Subsurface Conditions: Silty Sand PROJECT CASE STUDY icholson provided ground improvement for the construction of a new wastewater treatment plant in Roberts, ID. To mitigate liquefaction and reduce settlement, Nicholson installed 150 stone columns to a maximum depth of 24 feet using dry-bottom-feed meth- ods. With the dry-

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