Eversource at Work

30 Aug
Proposed plans for the high voltage transmission line that will go under the playing fields at the park, linking the Kendall Sq. substation with one in Allston/Brighton

Maybe you’re wondering, what’s that big barge doing in the middle of the river? Or will wonder come September, what is all that equipment on the playing fields? Here are some answers…

This week Eversource is conducting geotechnical borings in the Charles River near the park. The week of September 12th, they will probably be doing borings in the park’s playing fields.

The purpose of the river borings is to investigate subsurface conditions beneath the Charles River to further the design and engineering of a proposed underground electric transmission line crossing underneath the river bed as part of Eversource’s Greater Cambridge Energy Program. The goal of this program—scheduled to happen between 2024 & 2028—is to provide reliable and redundant energy systems for Cambridge, Somerville and Allston/Brighton. 

According to Eversource, the river borings will be conducted by an experienced marine geotechnical boring contractor that is specifically outfitted to perform such in-water borings. The contractor will access the boring locations using an approximately 25’ by 23’ floating barge from which the geotechnical boring drill rig will be operated. To conduct each boring, a 4.5” diameter casing will be extended from the water surface to the mud line, and the boring will be entirely “cased” through the water column to prevent discharge of sediment and potential turbidity while also allowing for the collection and recirculation of water used for lubrication of the drill head during the boring. All equipment and management of fluids will happen on the barge. There are no planned impacts to water navigation. 

Around September 12th, Eversource will also do three 8″ diameter borings on the Magazine Beach playing fields. The goal, again, will be to assess the subsurface geological conditions (i.e., layers, thickness and type of sand, silt, clay, rock, etc.) to help inform the design and engineering of the horizontal directional drill crossing of the river for the proposed transmission line.  Each boring will take about 1-2 days to complete.  Afterwards, Eversource will replace the top 12” of soil and reseed the area.

Have questions? Call the Eversource Transmission Information Line at 1-800-793-2202, or send an email to ProjectInfo@eversource.com.

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