National Grid’s Remediation Contractor continued with site remediation activities, which included the delivery of construction materials, imported backfill material (stone and common fill), and construction equipment and supplies.  Shallow Excavation Area remedial activities commenced at Tent Position #7 with off-site transport and disposal of impacted soils at approved and permitted disposal facilities. Placement of imported clean backfill material commenced within the Tent Position #7 Shallow Excavation Area.  Installation of temporary sheet piles continued at planned tent positions along the northern perimeter of the Site.   National Grid’s consulting engineer conducted noise and vibration monitoring activities, as necessary.

Maintenance of the decontamination areas, work zones, on-site gravel access roads, parking areas and material staging areas, the imported backfill material (i.e., clean fill) stockpile covers, the perimeter privacy screen, and soil erosion and sediment control (SESC) measures continued. Odor and dust suppression activities were conducted, as necessary. National Grid’s consulting engineers continued to monitor the site activities with the fixed base community air monitoring program (CAMP) equipment, as well as with noise and vibration monitors.

During the period from November 30, 2009 through December 6, 2009, six fixed base CAMP units and one portable CAMP unit were in-use and measured total volatile organic compounds (TVOC) and particulates (PM10). Fifteen-minute averages for both TVOC and PM10 data remained in the Operational Condition. No TVOC and PM10 measurements above the Action Level were reported for the weekly CAMP monitoring period. Weekly Reports of the CAMP data can be found as a separate tab in the Weekly Report Archive section.

For the week of December 7, 2009 through December 11, 2009, Tent Position #7 Shallow Excavation activities are scheduled for completion with off-site transport and disposal of impacted soils at approved and permitted disposal facilities. Delivery of imported clean backfill material (stone and common fill) and backfill material placement and compaction inside Tent Position #7 are scheduled for completion. On-site concrete demolition, crushing, and reuse operations are scheduled to continue at the Site, as necessary. Installation of temporary sheet piles will continue at planned tent positions along the northern perimeter of the Site.  Odor and dust suppression activities will be conducted as necessary. Work zone delineation, site maintenance activities, CAMP operation, and noise and vibration monitoring activities will continue.