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 # 3 with off-site transport and disposal of impacted soils at the approved and permitted disposal facilities. Further, placement of imported clean backfill material commenced within the Tent Position # 3 Shallow Excavation Area.   Temporary steel sheet piling installations continued at Tent Positions # 4 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 10, 2009 through August 14, 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 measurements were reported for the weekly CAMP monitoring period.  An elevated PM10 concentration below the Action Limit was reported on August 13, 2009 and was the result of idling equipment and not ground intrusive activities. Weekly Reports of the CAMP data can be found as a separate tab in the Weekly Report Archive section.

For the week of August 17, 2009 through August 21, 2009, Shallow Excavation Area remedial activities are scheduled to continue 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 continue.   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.