Flow Meter Installation

National Grid’s contractor and Project Team continued to construct the composite 120-foot deep dense non-aqueous phase liquid (DNAPL) Migration Barrier Wall (i.e., jet grouted barrier). The contractor continued Site preparations and Grout Plant power supply efforts and then commenced the Production Jet Grouting Program. In addition, general maintenance and security activities were continued at the Site. The National Grid Project Team finalized the results of the 2011 Pre-Production Jet Grouting Program and issued the field parameters and schedule for the 2012 Production Jet Grouting Program. The contractor continued the management of jet grouting derived wastes within the Waste Management Facility (WMF). The WMF, which manages wastes (e.g., soils, cement mix and water) that are generated from jet grouting activities is operated inside the tent with an active Vapor Management System (VMS). Jet grouting wastes were managed in accordance with NYSDEC approved procedures and wastes were disposed off-site at a licensed and permitted disposal facility. Attached is a representative photograph of the flow meter that was installed this week.

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 January 23, 2011 through January 29, 2012, six fixed base CAMP units were in operation and measured total volatile organic compounds (TVOC) and particulates (PM10). 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 week of January 30, 2012 through February 3, 2012, the contractor is scheduled to continue the Production Jet Grouting Program and commence the load-out of jet grouting derived wastes. The contractor will perform general maintenance activities and housekeeping at the Site, as necessary. Dust suppression activities will be conducted, as necessary. The contractor will perform general maintenance activities and housekeeping at the Site, as necessary. Dust suppression activities will be conducted, as necessary.