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.  Temporary sheet piling was removed from the former Tent Position #14 footprint and was staged for reuse at a future tent position. The final phase of tent relocation activities were conducted from Tent Position #14 east-northeast to Tent Position #13.  The final phase of tent relocation activities included the resetting of the two tent sections and replacement of the central panel, access doors, end panels, supports, and tent anchors at Tent Position #13. Tent Position # 13 shallow excavation activities also commenced in the eastern part of temporary fabric enclosure. 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 community air monitoring program (CAMP) equipment.

During the period from February 22, 2010 through February 28, 2010, 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 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 March 1, 2010 through March 5, 2010,     Tent Position #13 Shallow Excavation activities are scheduled to continue 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 and compaction will continue inside Tent Position #13. In addition, On-Site 120-foot deep DNAPL Migration Barrier Wall installations are scheduled to commence.    Odor and dust suppression activities will be conducted as necessary.  The NYSDEC-approved supplemental dust control measure, SoilTacTM, will be placed on non-traffic areas of the site, as necessary. Work zone delineation, site maintenance activities, and CAMP operation monitoring activities will continue.