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ST. LOUIS — McGrath & Associates has completed construction work on Ameren Missouri’s $8.5 million switching station located at 1901 Martin Luther King Drive in downtown St. Louis. The entire switching project, estimated at $42.5 million, is part of a larger Ameren Missouri investment to upgrade electric service in downtown St. Louis over the coming decades. McGrath constructed 70 structural piers with eleven concrete pad foundations, a perimeter fence and a new city sidewalk. McGrath also provided site work on the project, removing abandoned sewer pipes and cisterns, including remedial soil excavating.