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 #5 with off-site transport and disposal of impacted soils at approved and permitted disposal facilities. Placement of imported clean backfill material and compaction testing were completed within the Tent Position #5 Shallow Excavation Area. On-site concrete crushing operations continued in the western part of the Site with reuse as backfill for the Tent Position # 5 Shallow Excavation Area.  Installation of the 120-foot deep section of the On-Site DNAPL Barrier Wall continued along the northern part of the site. Installation of temporary sheet piles within the footprint of Tent Position #6 and Tent Position #7 continued.  After Tent Position #5 backfill placement activities were completed, the relocation of the temporary fabric enclosure and Vapor Management System (VMS) system to the west from Tent Position #5 to Tent Position #6 was performed. 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 October 26, 2009 through November 01, 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 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.