Weekly Update Ending: June 18, 2010

photo
Waterloo Flushing Operation

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. Drill rig and equipment used in support of the FCR-06 designated Phase 1b pre-drill operations is temporarily being staged in the western area of the Site.  On-site Waterloo BarrierTM interlocking steel sheet piling flushing and grouting operations continued.  Management of Phase 1b Pre-Drill Activities waste stockpiled inside Tent Position #10a and Tent Position #10a Shallow Excavation activities was completed, and included the off-site transport and disposal of impacted soils at approved and permitted disposal facilities. Backfill material placement and compaction inside the Tent Position #10a Shallow Excavation was also completed. 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.

photo
Site Wide Cap Common Fill

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 14, 2010 through June 20, 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 21, 2010 through June 25, 2010, Cap material deliveries along with final grading and Cap installation activities are scheduled to continue in the central and eastern parts of the Site.  Tent relocation activities from Tent Position #10a to the next Tent Position (Tent Position #15) will commence. Tent relocation activities 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 #15 Shallow Excavation activities are scheduled to commence 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 will continue. Temporary sheet piling will continue to be demobilized from the Site.  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.