Tent being moved to Position 3

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. Placement of imported clean backfill material continued within the Tent Position # 2 Shallow Excavation Area. On-going temporary fabric enclosure and Vapor Management System (VMS) operation and maintenance continued and included the southern end replacement and northern end double door enhancements. The temporary fabric enclosure was relocated west from Tent Position #2 to Tent Position #3. Temporary steel sheet piling installations continued at Tent Positions #3 through #6. 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 engineer 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 August 3, 2009 through August 9, 2009, six fixed base CAMP units and one portable CAMP unit were in-use and measured TVOC and PM10. Fifteen-minute averages for both TVOC and PM10 data remained in the Operational Condition. No elevated TVOC and PM10 measurements 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 August 10, 2009 through August 14, 2009, temporary fabric enclosure and VMS enhancements will be completed at Tent Position #3. Shallow Excavation Area remedial activities are scheduled to commence at Tent Position #3 with off-site transport and disposal of impacted soils at the approved and permitted disposal facilities. Delivery of imported clean backfill material (stone and common fill) and backfill material placement inside Tent Position # 3 will also commence. Temporary fabric enclosure and VMS operation and maintenance will continue at Tent Position #3.  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.