Wellpoint installation

Sevenson Environmental, National Grid’s Remediation Contractor, completed pre-trenching for the soil mix wall activities this week. Debris that is removed during pre-trenching is placed inside the designated storage pad, sprayed with long duration foam and covered with a plastic liner to mitigate potential odors until the debris is removed from the site for disposal. Last week 8 trucks were utilized to transport and dispose of 178 tons of the soil mix wall spoils to thermal facilities in New Jersey and Pennsylvania.

Sevenson’s soil mix wall subcontractor, Geocon, completed the construction of the soil mix wall along the perimeter of the site. A total of 321 soil mix wall columns were installed.

Dewatering well points and header pipe used to transfer water to the waste water treatment plant

Sevenson’s dewatering subcontractor, Griffin, continued the installation of the excavation dewatering system this week. The well points will be used to pump groundwater from the excavation to the waste water treatment plant.

Two-Week Outlook

Sevenson’s dewatering subcontractor, Griffin, continued the installation of the excavation dewatering system this week. The well points will be used to pump groundwater from the excavation to the waste water treatment plant.

National Grid contractors will continue working in Long Island Avenue to address sewer line issues. Work will continue to complete an inspection of the sewer line and conduct any necessary repairs.

General hours of operation will continue to be Monday through Friday, 7:00 AM to 5:00 PM. To maintain the ambitious schedule for the project, beginning Saturday, January 3, for a period of at least two months, work on the site will also be conducted on Saturdays, between 8:00 AM and 6:00 PM.