Ground Improvement
Laurel/Rolling Hills Wind Farm
![Rolling Hills Wind Farm, vibro stone columns, aggregate piers, aggregate piers contractor, ground improvement contractor](https://www.subsurfaceconstructors.com/wp-content/uploads/2016/08/Rolling-Hills-Wind-Farm.jpg)
Together, the Rolling Hills Wind Farm in Massena, Iowa and the nearby Laurel Wind Farm provide more than 550 megawatts of power and are some the largest single-phase wind farms in the U.S. Subsurface Constructors installed 7,800 vibro stone columns across a massive, sprawling area to deliver a maximum bearing pressure of 2,500 pounds per square foot. The site consists of loess underlain by deep glacial till with a depth range of 5 to 30 feet
Project details:
Owner: MidAmerican Energy
Geotechnical Engineer: Barr Engineering
General Contractor: M.A. Mortenson
Structural Engineer: Barr Engineering
Services Provided: Ground improvement, stone columns
Year: 2011
Location: Massena, Iowa
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