Weekly Update Ending: April 01, 2011

Community Board 14 April Meeting
April 12th 2011    7:45 PM
National Grid report on MGP site remediation
Knights of Columbus Hall
333 Beach 90 Street  

National Grid’s Remediation Contractor and Project Team continued to plan for the third phase (Phase 3) of the 120-foot deep dense non-aqueous phase liquid (DNAPL) Migration Barrier Wall installation. Phase 3 will consist of the installation of a deep jet grouted barrier wall to complete the 120-foot deep Composite DNAPL Migration Barrier Wall Installation. The Remediation Contractor removed wind-damaged panels from the temporary enclosure structure along the eastern and western ends as well as the northwest and southwest corners. Contractor also performed general maintenance activities and housekeeping at the Site. No intrusive remediation construction activities were conducted at the Site. 

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 March 28, 2011 through April 3, 2011, six fixed base 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. 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 April 4, 2011 through April 8, 2011, general site maintenance and housekeeping will be performed, as necessary. No intrusive remediation construction activities are scheduled at the Site. Dust suppression activities will be conducted, as necessary. CAMP operation monitoring activities will continue. The specialty contractor procurement for the 120-foot deep Composite DNAPL Migration Barrier Wall Installation is scheduled to continue.