In early 2008, the Frederick County (Maryland) Division of Utilities and Solid Waste Management awarded a $72.9 million contract to expand its New Design Road Water Treatment Plant (NDRWTP). The project nearly tripled the size of the treatment plant´s capacity from 8.8 to 25 mgd. The article discusses construction challenges created by the karst terrain around Frederick County, and describes the use of micropiles to provide both tension and compression resistance when drilled through overlying weak layers of soil, and then 'socketed' into bedrock.
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