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 continued.  Tent relocation activities from Tent Position #10a to the next Tent Position (Tent Position #15) were performed. 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 #15 Shallow Excavation activities commenced with off-site transport and disposal of impacted soils at approved and permitted disposal facilities.  Common fill material deliveries and final grading and cap installation activities continued to progress in the central and eastern parts of the Site. Decontaminated temporary sheet piling presently staged in the northwest corner of the Site continued to be loaded and demobilized from 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 June 21, 2010 through June 27, 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 June 28, 2010 through July 2, 2010, cap material deliveries along with final grading and cap installation activities are scheduled to continue in the central and eastern part of the Site.  Tent Position #15 Shallow Excavation activities are scheduled to continue with off-site transport and disposal of impacted soils at approved and permitted disposal facilities.  Flushing and grouting operations of the on-site Waterloo BarrierTM interlocking steel sheet piling are scheduled to continue. Odor and dust suppression activities will be conducted, as necessary.  Work zone delineation, site maintenance activities, CAMP operation monitoring activities as well as noise and vibration monitoring activities will continue.