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. On-site Waterloo BarrierTM interlocking steel sheet piling flushing and grouting operations were completed. Tent Position #15 Shallow Excavation activities were completed with off-site transport and disposal of impacted soils at approved and permitted disposal facilities.  Backfill material placement and compaction inside the Tent Position #15 Shallow Excavation was also completed. Temporary steel sheet piling was also removed from Tent #13 footprint and staged for demobilization from the Site. Common fill material deliveries and final grading and cap installation activities continued to progress in the southeastern and central parts 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, 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 July 12, 2010 through July 18, 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 July 19, 2010 through July 23, 2010, cap material deliveries along with final grading and cap installation activities are scheduled to continue in the southeastern and central parts of the Site.  Tent relocation activities from Tent Position #15 to the next Tent Position (Tent Position #10b) will commence. 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. Tent Position #10b Shallow Excavation activities are scheduled to commence with off-site transport and disposal of impacted soils at approved and permitted disposal facilities.  Temporary sheet piling will continue to be removed and staged in the southeast corner of the Site for future demobilization. Delivery of imported clean backfill material (stone and common fill) and backfill material placement and compaction are also scheduled to be completed inside Tent Position #15.   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.