Cable burial depth checked

Sat, 09/03/2016 - 8:00am

While Deepwater Wind completed its assembly of the Block Island Wind Farm’s towers on Thursday, Aug. 18, some minor construction activity will continue before the project becomes operational in the fourth quarter of 2016. 

During the past week or so, the lift-boat LB Michael Eymard was seen offshore at the wind farm site and off Crescent Beach. Deepwater Wind spokesperson Meaghan Wims informed The Block Island Times on Monday, Aug. 29 that the lift-boat has been working on the “proper burial and cover of the cable.”     

According to Deepwater Wind, the submarine cable installation was shallow of its target depth in some locations due to anomalies in the seabed that the jet plow encountered during the installation process. The jet plow is the device that dug a six-foot deep trench in the seafloor and buried the cable.

Deepwater Wind deployed the LB Michael Eymard to address areas where the submarine cable was not buried properly, utilizing a concrete material to ensure coverage of the cable on the seafloor. The LB Michael Eymard is a 137-foot long class 215 lift-boat with two cranes and a deck load of one million pounds that is owned and operated by Offshore Marine Contractors, Inc. located in Louisiana.

There are two separate submarine transmission cables associated with the project that needed to be addressed by the vessel: National Grid’s 20-mile long sea2shore cable, which connects the island to the mainland, and Deepwater Wind’s eight-mile long export cable that links the island to the turbines. Both submarine cables were installed north of Fred Benson Town Beach.