National Grid’s Remediation Contractor and Project Team continued to plan for the composite 120-foot deep dense non-aqueous phase liquid (DNAPL) Migration Barrier Wall (i.e., jet grouted barrier) installation. The Remediation Contractor studied the Site for damage following the aftermath of the Hurricane Irene storm event and conducted general maintenance and housekeeping activities. No intrusive remediation construction activities were conducted at the Site. The jet grouting contractor (JGC) and waste management and emergency response (WM/ER) contractor were involved with the final procurement, preparation of pre-mobilization submittals and scheduling activities for the project.

Maintenance of the imported backfill material (i.e., clean fill) stockpile covers 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 August 29, 2011 through September 4, 2011, six fixed base CAMP units were in operation and measured total volatile organic compounds (TVOC) and particulates (PM10). After the Hurricane Irene storm event, the CAMP units were studied and repowered at 10 AM on Monday, August 29, 2011. Fifteen-minute averages for both TVOC and PM10 data remained in the Operational Condition. There were no elevated readings for TVOC or PM10 for this 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 holiday week of September 6, 2011 through September 9, 2011, no intrusive remediation construction activities are scheduled at the Site. The Remediation Contractor will commence mobilization of personnel and equipment and conduct initial layout efforts for the Phase 3 Composite 120-foot deep DNAPL Migration Barrier Wall Installation project. In addition, the contractor will conduct general maintenance activities and housekeeping at the Site, as necessary. Dust suppression activities will be conducted, as necessary. CAMP operation monitoring activities will continue.