Placing and grading backfill under Tent 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. Shallow Excavation Area remedial activities were completed at Tent Position #3 with off-site transport and disposal of impacted soils at the approved and permitted disposal facilities. Further, placement of imported clean backfill material and compaction testing activities were completed within the Tent Position #3 Shallow Excavation Area. . 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 August 24, 2009 through August 30, 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. On Friday, August 28, 2009, elevated PM10 concentrations at Fixed Air Monitoring Site 3 (FAM 3) were reported and were the result of site housekeeping (sweeping) in the vicinity of FAM 3 and were not associated with ground intrusive activities at the Site. Weekly Reports of the CAMP data can be found as a separate tab in the Weekly Report Archive section.

For the week of August 31, 2009 through September 4, 2009, the temporary fabric enclosure and VMS system will be relocated from Tent Position #3 to Tent Position #4. Tent Position #4 Shallow Excavations are scheduled to commence 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 inside Tent Position #4 will also commence. 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.