Load Out as excavation at Position 2 begins.

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.  The temporary fabric enclosure (tent), the tent anchoring system, and Vapor Management System (VMS) were re-assembled at Tent Position #2 in the southeastern part of the site.  The Tent Position #2 Shallow Excavation and load-out remedial activities commenced inside the temporary fabric enclosure as well as the off-site transport of impacted material to approved and permitted disposal facilities.  Operation of the VMS at Tent Position # 2 commenced and worker health and safety monitoring activities were conducted at the site, as necessary.  The placement and compaction of imported backfill material commenced within the northern portion of the Shallow Excavation Area at Tent Position #2.   Record of construction surveys and construction stake-out surveys continued as site remediation activities progress. 

Personnel and equipment decontamination pads were utilized throughout site operations.  Further delineation of work zones (i.e., exclusion, decontamination, and support) continued, as required. Maintenance of the on-site gravel access roads, parking areas and material staging areas, the imported backfill material (i.e., clean fill) stockpile covers, and the perimeter privacy screen continued.    Maintenance of engineering controls and soil erosion and sediment control (SESC) measures continued. Odor and dust suppression activities were conducted, as necessary. National Grid’s consulting engineer continued to monitor the site activities with the fixed base community air monitoring program (CAMP) equipment.

CAMP data is reviewed and compared to specific NYSDEC/NYSDOH approved criteria, known as “Action Limits.” As a result of this evaluation process, site conditions are categorized into two categories, “Operational Condition” and “Action Condition.” The “Operational Condition” is applicable when the data is below the “Action Limits”, and means that normal operations can continue. The “Action Condition” occurs when one or more of the fifteen minute average measurements for Dust (PM10), Total Volatile Organic Compounds (TVOC), Naphthalene or Odor Intensity are greater than the background or upwind measurement by the specified “Action Limits.” Reaching an Action Level requires corrective action or stopping work until the condition is addressed or abates. During the period from June 29, 2009 through July 5, 2009, six fixed base CAMP units and one portable CAMP unit were in-use and measured TVOC and PM10. Fifteen-minute averages for TVOC and PM10 data remained in the Operational Condition. On Wednesday, July 1, 2009 between 1028 Hours (10:28 AM) and 1038 Hours (10:38 AM),  elevated PM10 concentrations were reported and were the result of On-Site truck activity (imported backfill material delivery) along the crushed stone internal access road and were not associated with site intrusive activities.  The elevated concentrations lasted for a period of 11 minutes at Station FAM 2. Dust suppression (i.e., site watering) activities were performed immediately after the reported event and PM10 concentrations were subsequently reduced to the Operational Condition. Further, background concentrations reduced the elevated concentrations below the action limit; therefore the site remained in the Operational Condition (less than the Action Limit). Weekly Reports of the CAMP data can be found as a separate tab in the Weekly Report Archive section.

For the week of July 6, 2009 through July 10, 2009, Shallow Excavation Area remedial activities are scheduled to continue at Tent Position #2 with off-site transport and disposal of impacted soils at the approved and permitted disposal facilities. Delivery of imported clean backfill material (stone and common fill) will continue. Work zone delineation and maintenance of the on-site gravel access roads, truck lining and tarping stations, personal and equipment decontamination pads, and the truck scale will continue. National Grid’s consulting engineer will continue to monitor the site activities with noise and vibration monitoring equipment, as necessary. Maintenance of engineering controls and SESC measures will continue, as necessary.  Work zone air monitoring and VMS system inspection and performance monitoring will continue.  Odor and dust suppression activities will be conducted as necessary. National Grid’s consulting engineer will continue to monitor the site activities with CAMP equipment.