Amtrak 138kv Transmission Line Landover, Maryland to Washington D.C. From December 2009 to August 2010 , Case Foundation Company installed 135 Drilled Shafts for a new transmission line to upgrade the power supply to Amtrak’s Northeast Corridor. The shafts were 4.5’ diameter and up to 30’ deep. The scope of work included furnishing and placing permanent casing, reinforcing steel and concrete. The installation of these shafts was pe

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