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. Delivery of imported clean backfill material and backfill material placement and compaction were completed inside Tent Position #15.  Tent relocation activities from Tent Position #15 to the next Tent Position (Tent Position #10b) commenced. 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, and end panels.  The temporary fabric enclosure supports, tent anchors, and VMS were reset as the final phase of the tent position relocation. Tent Position #10b Shallow Excavation activities commenced with stockpiling inside the temporary fabric enclosure in preparation for load-out from Tent #10b with off-site transport and disposal of impacted soils at approved and permitted disposal facilities.  Temporary sheet piling ontinued to be removed, staged for demobilization from the Site. Common fill material deliveries and final grading and cap installation activities continued to progress at 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 19, 2010 through July 25, 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.  On Monday, July 19, 2010 there was a period of elevated PM10 concentrations at Fixed Air Monitoring Site 1 (FAM 1). The elevated concentrations were caused by high relative humidity. All elevated concentrations were reduced below the Action Limit after background subtraction. 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 26, 2010 through July 30, 2010, Cap material deliveries along with final grading and cap installation activities are scheduled to continue at the Site.  Tent Position #10b Shallow Excavation activities are scheduled to continue 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 for future demobilization. Delivery of imported clean backfill material (stone and common fill) and backfill material placement and compaction are scheduled for Tent Position #10b.   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.