Crane unloading filter media into tanks for the Waste Water Treatment Plant

Sevenson Environmental, National Grid’s Remediation Contractor, is continuing mobilization activities, which includes bringing construction equipment, materials and temporary facilities to the site. LIPA completed the activation of the electrical service for the site this week. Sevenson continued pre-trenching 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 any potential odors until the debris is removed from the site for disposal. Last week 31 trucks were utilized to transport and dispose of 689 tons of the soil mix wall spoils to a thermal facility in New Jersey.

LIPA completing the power drop for the site

Sevenson’s soil mix wall subcontractor, Geocon, continued the construction of the soil mix wall along the perimeter of the site parallel to Long Island Avenue. A total of 42 soil mix wall columns were installed.

National Grid determined that site operations have impacted sanitary sewer flow in Long Island Avenue, adjacent to the Post Office. National Grid is working to remedy the problem. National Grid contractors have been using trucks to bypass and transport sanitary water directly to the Village treatment facility. A press release has been issued detailing the issue further.

Two-Week Outlook

Sevenson is expected to continue the mobilization of equipment, materials, and temporary facilities. Set-up of the water treatment plant will be ongoing for the next several weeks. Sevenson and Geocon are also expected to continue pre-trenching activities and the construction of the soil mix wall along the perimeter of the work area. Sevenson will also be installing traffic control barriers for the pedestrian walkway along Long Island Avenue. Mobilization of the temporary fabric structure is also scheduled to begin within the next two weeks.

National Grid contractors will be installing a discharge pipeline thru the inner Harbor to a point beyond the breakwater.

National Grid contractors will be working in Long Island Avenue periodically to address sewer line issues.

General hours of operation will continue to be Monday through Friday, 7:00 AM to 5:00 PM.