Updated January 23, 2017
Implementation of the remedial work to construct the utility corridor was completed on July 6, 2012 with the completion of the capping system over the utility corridor area. The Construction Completion Report (CCR) prepared to document the implementation of the NYSDEC-approved Utility Corridor Work Plan was prepared and submitted to the NYSDEC for review and comment in December 2012. The NYSDEC approved the CCR via a letter dated March 13, 2013. The CCR will be incorporated into the Final Engineering Report prepared after the completion of the remedial activities at the Site.
The 50%-75% Remedial Design Report (RDR) documenting the design and methods for implementation of the remedy selected for the Site as documented in the March 2010 Record of Decision was prepared and submitted to NYSDEC for review and comment in December 2012. The NYSDEC provided comments on their review of the report in a letter dated June 12, 2013. National Grid responded to the NYSDEC comments via a letter dated August 6, 2013.
Based on one of the comments in the NYSDEC June 12, 2013 letter and subsequent discussions with the NYSDEC, National Grid submitted a letter work plan to the NYSDEC on August 8, 2013 detailing the means and methods to conduct further characterization on the adjacent property. The NYSDEC approved the letter work plan on August 20, 2013.
The investigation activities included in the August 2013 work plan were implemented on May 7 and 8, 2014. A total of 11 borings were installed. The results of the investigation activities were summarized in a letter report which was submitted to the NYSDEC on June 18, 2014. Based on the results of these investigation activities, an addendum to the August 2013 work plan was submitted to the NYDEC on February 1, 2016. The addendum proposed the installation of additional borings to complete the delineation of the proposed limits of remediation on the off-site property. The results of the implementation of the February 2016 work plan addendum were submitted to the NYSDEC on April 25, 2016.
National Grid submitted a Notice of Intrusive Activity (NOIA) for the Site. The NOIA was associated with the installation of a utility pole along the property line between the Site and the off-site property and the connection of the electric service to the building located on the off-site property. The work was performed on October 28, 2014. A summary of the implementation of the work and the associated monitoring was submitted to the NYSDEC in a letter dated November 7, 2014
A draft version of an Interim Site Management Plan (ISMP) was submitted to the NYSDEC on January 15, 2016. The ISMP documents the engineering and institutional controls at the Site which address remaining contamination that will remain after implementation of the remedy at the Site.
National Grid continues to monitor groundwater at the Site. Groundwater was monitored on a quarterly basis until the second quarter of 2012. Following the second quarter 2012 groundwater monitoring event, the frequency of the sampling component of the monitoring program was returned to a semi-annual schedule. The measurement of water levels and gauging the wells for the presence of non-aqueous phase liquid (NAPL) remained on a quarterly basis. Based on the historical patterns established through the historical groundwater monitoring, National Grid proposed, via a letter dated October 8, 2013, to the NYSDEC to adjust the frequency of the water level measurement/NAPL gauging component of the groundwater monitoring program (current conducted on a quarterly basis) to a semi-annual schedule, putting it on the same schedule as the groundwater sampling component (conducted semi-annually). NYSDEC agreed with this proposal.
National Grid continues to monitor the wells on a semi-annual basis. The latest groundwater report summarizing the results of the first-half 2016 semi-annual groundwater monitoring event was submitted to the NYSDEC on September 8, 2016. The second-half 2016 groundwater monitoring event was conducted on December 27, 28 and 29, 2016.
National Grid is currently preparing the 95% Remedial Design Report (RDR) for the Site. Submission of the 95% RDR to the NYSDEC is anticipated late 2017. Using the 95% RDR, National Grid will procure a Remedial Contractor to implement the remedy for Site. Once the Contractor is procured, the remedial design will be finalized and the 100% RDR submitted to the NYSDEC. Upon approval, the National Grid will mobilize its Team to the Site to implement the remedy. Remedial construction is anticipated to begin in 2018.