Engineers from the state Department of Environmental Protection are assessing the situation on Frederick Street in Mount Oliver, where a suspected case of mine subsidence ground has forced people to ... more 
Engineers from the state Department of Environmental Protection are assessing the situation on Frederick Street in Mount Oliver, where a suspected case of mine subsidence ground has forced people to leave their homes. less 
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WTAE - Pittsburgh Videos
Mon, Jul 15, 2013 1:25 PM EDT