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 re-driven at the next tent position. Tent relocation activities were conducted from Tent Position #14 east-northeast to the next tent position. Tent relocation activities included the temporary disassembly and staging of tent anchors and the vapor management system (VMS), temporary removal of the central panel, end panels and access doors, followed by the relocation of the two tent sections and replacement of the central panel, access doors, end panels, and supports and tent anchors. 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.

During the period from February 15, 2010 through February 21, 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. Elevated readings for PM10 below the Action Limit were reported on February 15, 2010 and were the result of general housekeeping at the construction trailers; the housekeeping effort was ceased and the site remained in the operational condition.  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 February 22, 2010 through February 26, 2010, the removal of temporary sheet piling is scheduled to continue at the former Tent Position #14 and will be re-driven at future tent positions, as necessary   The final phase of tent relocation activities from Tent Position #14 east-northeast to the next tent position are scheduled for completion, including the resetting of the temporary fabric enclosure supports, tent anchors, and VMS. In addition, the relocation and resetting of the load-out stations (e.g., truck lining, scale, tarping, decontamination station, etc.) is scheduled for completion. Shallow Excavation activities are scheduled to commence this week at the next tent position (Tent Position # 13). 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.