National Grid’s Remediation Contractor continued with site remediation activities, which included the delivery of construction materials, imported backfill material (stone and common fill), as well as construction equipment and supplies. Tent relocation activities from Tent Position #9 to the next Tent Position (i.e., tent position for Phase 3 120-feet deep Composite DNAPL Barrier Wall Installation waste management operations) continued. Tent relocation activities included the relocation of the two tent sections and setup in the north-central area of the Site in preparation for the ultimate re-assembly of the central panel, access doors, and end panels prior to the commencement of the Phase 3 field operations. The majority temporary fabric enclosure supports/tent anchors was secured, while the remaining anchor ballasts and the vapor management system (VMS) were temporarily staged on-site. The remaining anchor ballasts and VMS will be reset as the final phase of the tent position relocation activities prior to the start of the Phase 3 field operations. Temporary sheet piling removal, decontamination, and on-site staging for re-use or for future demobilization, continued. Common fill material deliveries, grading activities, and Cap construction continued.  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, 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 community air monitoring program (CAMP) equipment.

During the period from September 13, 2010 through September 19, 2010, six fixed base CAMP units and two portable CAMP units 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 or PM10 readings were reported for the weekly monitoring period.  The Weekly Report that summarizes the CAMP data can be found as a separate tab in the Weekly Report Archive section.

For the week of September 20, 2010 through September 24, 2010, delivery of imported clean backfill material (crushed stone and common fill) and backfill material placement and compaction is scheduled to continue.   Common fill material deliveries, grading activities, and Cap construction are schedule to continue. Temporary sheet piling will continue to be removed and staged on-site for re-use or for future demobilization from the Site. Odor and dust suppression activities will be conducted, as necessary.  Work zone delineation, site maintenance activities, CAMP operation monitoring activities will continue, and noise and vibration monitoring activities will continue, as necessary.