Located in Boston’s Back Bay, the decades-old, Scotia Street substation houses two 115kV transformers, with 24 feeder lines distributing electricity for 13,500 customers. Performing work inside this energized facility, in a highly congested metropolitan area, leaves no room for error.

Our scope required strategic dust-free demo, excavation, and stone placement, as well as cast-in-place concrete. The work zone featured extremely tight working conditions within the basement where we installed 10-foot high (CMU) concrete block partition walls and 3/4” stone to expand the transformer oil containment system. Suspending overhead formwork to cast drainage troughs in the floor above proved to be a challenging integrated detail atop the new CMU walls. All this work had to be completed per an accelerated construction schedule, and during an outage where work was conducted 24 hours a day for several weeks of the project.