Work on site week of January 25

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 continued at Tent Position #14 with off-site transport and disposal of impacted soils at approved and permitted disposal facilities. In addition, the NYSDEC approved cut and cap operations were performed in the southwestern part of the Site. Placement of imported clean backfill material continued within the Tent Position #14 Shallow Excavation Area and continued at the two foot thick cap in the southwestern part of the Site. 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 1, 2010 through February 7, 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. There were no elevated readings for TVOC or PM10 for the monitoring period.   Weekly Reports that summarize the CAMP data can be found as a separate tab in the Weekly Report Archive section.

For the week of February 8, 2010 through February 12, 2010, Tent Position #14 Shallow Excavation activities are scheduled for completion with off-site transportation and disposal of impacted soils at approved and permitted disposal facilities. Delivery of imported clean backfill material (stone and common fill) will continue and backfill material placement and compaction is scheduled for completion inside Tent Position #14. Tent Position #14 relocation east-northeast to the next Tent Position is also scheduled. Tent relocation activities will include 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, and end panels.  The temporary fabric enclosure supports, tent anchors, and VMS will be reset as the final phase of the tent position relocation. 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.