Weekly Update for Week of March 28th

National Grid’s contractor has excavated overburden material and graded the project site to the subgrade elevation and has begun laying down the demarcation fabric and the pavement edging of the walkway starting from the west side of the property. Flushing and grouting of the interlock joints of the barrier wall also took place.

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 “Alert, Response and 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) 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 Monday, March 14, 2016 through Friday, March 25, 2016, two portable CAMP stations were in-use and measured TVOC and PM10. Fifteen-minute averages for TVOC and PM10 data remained below the Action Limit.

For the week of March 28, 2016, flushing and grouting the interlock joints and excavating of overburden material will take place. The bench pad sub-base will be formed and the wooden forms for the concrete pads will be installed. Installation of the recovery well located on the south side of the barrier wall alignment will also begin.