National Grid’s Remediation Contractor continued with site mobilization and preparation activities, which included the delivery of construction materials, additional equipment and supplies. The installation of the construction support trailers, water lines and sanitary holding tanks, communication utilities, office equipment, and utility connections also continued. The two foot thick Site Wide Cap and perimeter utility cut and cap excavations continued along the eastern and southeast corner of the site and were initiated along the southern part of the site. Utilities exposed during the operation were identified and marked to be subsequently surveyed and decommissioned, as appropriate. The excavated materials were transported off-site for disposal at approved and licensed disposal facilities. Demolition of concrete continued in the area of the former electrical substation and commenced along the eastern side and southeast corner of the site, where concrete was relocated to a staging area located in the southwest corner of the site. Noise and vibration monitoring activities were conducted during the concrete demolition activities. Select on-site groundwater monitoring wells were abandoned in order to support future remedial actions.

The personal and equipment decontamination pads were utilized throughout the weekly site operations.  Further delineation of work zones (i.e., exclusion, decontamination, and support) continued, as necessary. Maintenance of the interior access roads, parking areas, staging area, and upgrade of the clean fill stockpile cover continued.  Maintenance of the site 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 February 2, 2009 through February 6, 2009, six fixed base CAMP units and two portable CAMP units were in-use and measured TVOC and PM10. Fifteen-minute averages for TVOC and PM10 data remained in Operational Condition. On Monday, February 2, 2009, elevated concentrations of dust for a period of approximately 12 minutes were reported at the fixed based CAMP unit, FAM-4. These elevated concentrations were detected at the upwind CAMP unit (FAM-4). CAMP units downwind of the Site remained in the Operational Condition. These observations indicated that elevated concentrations were attributable to a localized source. This dust was not associated with intrusive activities; therefore the site remained in the Operational Condition (i.e., 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 February 9, 2009 through February 13, 2009, the Remediation Contractor plans to complete the final installation of the support trailers, office equipment, phone and cable, and utility connections. Perimeter utility cut and cap excavation activities are scheduled to continue along the eastern and southern sides and southeast corner of the site with off-site transport and disposal of excavated impacted material at an approved and licensed disposal facility. Utilities exposed during the excavation activities will be identified, surveyed, and decommissioned, as appropriate. Concrete pads along the eastern and southern part of site will be demolished. Select demolished concrete planned for reuse will be consolidated in the southwestern area of the Site for future crushing and reuse in accordance with the applicable NYSDEC approvals. 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. In addition, National Grid’s consulting engineer will continue to monitor the site activities with noise and vibration monitoring equipment.