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 general maintenance and security activities at the Site. The National Grid Project Team is currently evaluating the results of the 2011 Pre-Production Jet Grouting Program and is developing the field parameters and schedule for the 2012 Production Jet Grouting Program.

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 3, 2011 through January 8, 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 9, 2012 through January 13, 2012, limited site activities are proposed. The contractor will install the power drop for the Grout Plant, as well as perform general maintenance activities and housekeeping at the Site, as necessary. Dust suppression activities will be conducted, as necessary.