August 2023

Whittemore Ave neighborhood area and North Parking Lots:

  • Building 1: Ongoing activities related to interior construction
  • Building 2: Continued construction activity
  • Building 3: will have concrete foundations and steel erection activity.
  • North Parking Lot B will have a large tent erected and active with soil disturbing activities

Large white tent #2 is in the final footprint of Building 3.  Large white tents #3 and #4 are currently in the footprint of Building 4.  Tent #1 is currently in the footprint of Building 5. Tent #7 will west move along the south side of Building 2.  By end of the month, Tent #3 will be relocated to the footprint of the Garage.  All tent locations will be active with soil disturbing activities.    

Open excavation in clean soils will be conducted on the east and west sides of Building 2 and in the footprint of Building 3.  Concrete footings and foundations will continue to be formed and poured in these locations. Throughout the month, structural steel erection will begin on the west side of Building 3, east addition of Building 2, and the Loading Dock between Buildings 1 and 2.

Open excavation in clean soils will continue south of Building 1 for the installation of underground piping and conduit for site utilities.

Pile driving activities will resume mid-August in the footprint of Building 4.

A pile foundation is defined as a series of steel beams inserted into the ground to transmit loads to a lower level of subsoil. A vibratory hammer is a machine attached to a boom crane, that holds the pile vertical and vibrates it into the ground. Piles are vibrated and pushed into the ground to act as a steady support for structures built on top of them. Piles transfer the loads from structures to hard strata, rocks, or soil with high bearing capacity

Piles are initially driven using a vibratory hammer.  This method typically has less noise and a small vibration footprint.  Once piles are driven to the required depth at bedrock, the piles are then finished by mean of impact hammer. A pile impact hammer is a machine that hammers it into the bedrock. Blows are repeated by lifting a heavy weight and dropping it on top of the pile. Piles should be hammered into the ground until the refusal point is reached, which is the point where a pile cannot be driven into the soil any farther. Typically, each pile would receive somewhere between 10 & 20 plows before reaching its refusal point.

Eversource electrical utility work at the end of Harvey Street has been completed.  This work brought underground power to the site for our temporary construction electrical substation.  Temporary overhead electrical lines and poles are all installed throughout the site for the distribution of construction related electricity.  Electrical substation and power to the site should go live mid-August.

Modifications and improvements to the public pathways on the west side of the property running from Whittemore Ave down along Parkway Pond to the MBTA Headhouse Plaza has been completed. DCR recently repaved a majority of the path. Activation of the emergency call box phones on the most southern section is expected to be completed in August.

Two generators currently run 24/7 to power the following critical operations.  These generators were granted a noise ordinance variance by the City of Cambridge Licensing Commission. Once the electrical substation and power to the site goes live, these generators will no longer run off-hours.

  • Fire alarm systems in Building 1 and Building 2
  • Provide freeze protection for Building 1 Cambridge Fire Department wall hydrant connection
  • Perimeter site security lighting
  • Perimeter air and noise monitoring
  • Excavation dewatering activities

Other generators run during regular working hours to support a variety of construction activities.