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An arena being built for the Philadelphia Flyers' minor league affiliate hockey team will be founded on micropiles to mitigate possible sinkhole problems in the limestone bedrock. The arena in located at the site of a catastrophic collapse of a building, Corporate Plaza, in 1994. The collapse was blamed on sinkholes under the foundation that caused settlement and the rupture of a water main, flooding the area and exacerbating the issue. The building eventually had to be demolished. [Source: Morning Call via AGC SmartBrief. Image: CHUCK ZOVKO, The Morning Call]
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