Decontaminating truck tires prior to departure from the site

Sevenson Environmental, National Grid’s Remediation Contractor, completed the relocation of the temporary fabric structure (TFS) and the placement of the air handling unit, dewatering pumps, and other ancillary equipment. Soil excavation from within TFS location #2 commenced on Wednesday, February 18. 3,839.47 tons of MGP-impacted soils were transported from the site to a thermal treatment facility in Southeast Pennsylvania. The total amount of soil removed from the site to date is 11,251.88 tons. Sevenson’s survey contractor, Nelson & Pope, continued the survey of the base of the excavation to confirm final excavation depths. Backfilling of the excavated areas began once final excavations were confirmed.

Sevenson’s dewatering subcontractor, Griffin, completed the installation of the dewatering wellpoints and headers and began dewatering operations on Wednesday, February 18. 868,843 gallons of water was treated this week, bringing the total amount of treated water discharged from the site to 4,206,777 gallons.

Roller compacting imported backfill material

Two-Week Outlook

Soil excavation and backfilling at the current location of the TFS is scheduled to be completed next week. The second move of the TFS and ancillary equipment is anticipated to begin early next week, with excavation activities at the third TFS location scheduled to begin the following week. Access road re-alignment for on-site truck traffic, site grading, and site maintenance activities will continue in preparation for the relocation of the TFS. Backfill material will continue to be delivered to the site on an as-needed basis.

Sevenson’s dewatering subcontractor will continue the operation of the excavation dewatering system until backfilling of the current location is complete, then begin installation of dewatering wellpoints at the next excavation location. Water treatment plant personnel will conduct general maintenance of the water treatment plant while the plant is shut down during the installation of the new dewatering wellpoints.

General hours of operation will continue to be Monday through Friday, 7:00 AM to 5:00 PM, and Saturdays, between 8:00 AM and 6:00 PM.