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.  Preparations continued for the re-assembly of the temporary fabric enclosure elements including central panel, access doors, skirt, and end panels prior to the commencement of the Phase 3 field operations. Phase 3 will consist of the installation of a deep soil-cement barrier wall to complete the 120-foot deep composite DNAPL Migration Barrier Wall installation. The majority of the temporary fabric enclosure supports/tent anchors continue to be secure, while the remaining anchor ballasts and the vapor management system (VMS) are being 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. Imported backfill 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 20, 2010 through September 26, 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 27, 2010 through October 1, 2010, delivery of imported backfill material (crushed stone and common fill) and backfill material placement and compaction is scheduled to continue.   Imported backfill material deliveries, grading activities, and cap construction are scheduled to continue. Temporary sheet piling removal, decontamination,  and staging on-site for re-use or for future demobilization are scheduled for completion at 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.