74 Middlesex Avenue
Location: Somerville, MA
Completion Date: April, 2022
General Contractor: Turner Construction Company
Vital Statistics: Project Value: $8,300,000.00
Wall Type: 36" Reinforced Concrete Wall with slurry subgrade struts
Wall Area: 67,000 S.F.
Max. Excavated Depth: 63'
74 Middlesex is positioned at the edge of the new Assembly Square community near Assembly Station on the MBTA's Orange Line. This life science office and lab building included a 31⁄2 level basement with an excavated depth of 48' below subgrade. Numerous utilities and existing structures were present around the site, including a 36" MWRA water line, a 9' x 12' storm drain, and an Interstate 93 exit ramp. Allowable lateral movements around the site were restricted to 1⁄2". High voltage overhead lines were also within close proxiMid74y to the proposed foundation. East Coast Slurry worked with the design team to design a 36" slurry wall with 2 levels of internal bracing plus a level of subgrade slurry struts to meet these stringent design requirements.